CN103895589B - Car-mounted electronic control device - Google Patents

Abstract

Car-mounted electronic control device (21) comprises selection circuit (34), and this selection circuit is received and is connected to first supply lead (22) of battery (5), the 2nd supply lead (23) being connected to battery by the normally opened contact (4a) of main relay (4) by ignition switch (2) and is connected to the voltage of the 3rd supply lead (24) of battery by the coil (4b) of main relay. Selection circuit selects maximum voltage in these voltages. This selection circuit can supply cell voltage to supply lead (35) with continuing, and the ON/OFF state regardless of ignition switch. It can operate the RAM(10 of such as microcomputer (7) lastingly) and so on circuit. In addition, by disconnecting battery and the simplify processes again connected carrys out initialize flash memory (135).

Description

Car-mounted electronic control device

The application is that the application number submitted on October 28th, 2011 is 201110335144.9 and denomination of invention is point case application of Chinese patent application of " car-mounted electronic control device ".

Technical field

The present invention relates to a kind of car-mounted electronic control device, the control of this car-mounted electronic control device is from the supply of the electric power of battery, and the state regardless of ignition switch.

The present invention also relates to a kind of car-mounted electronic control device, this car-mounted electronic control device after battery is again disconnected and is connected operate started time initialize nonvolatile memory in data.

Background technology

Disclosed in patent documentations 1,2 etc., conventional car-mounted electronic control device is configured as illustrated in Figure 10.

[patent documentation 1] JP2005-307851A (US2005/0236900Al)

[patent documentation 2] JP2006-105001A (US2006/0072365Al)

In this routine car-mounted electronic control device, when ignition switch 2 conducting, the electronically controlled equipment (hereinafter referred to ECU) 1 of control car engine carrys out conducting main relay 4 by driving circuit 3. Primary source circuit 6 generates main power voltage V according to the voltage VB supplied from battery 5 by main relay 4_OMAnd it is supplied to the main processing unit 8 of the CPU comprising microcomputer 7.

Require that ECU21 keeps as the data in the RAM10 of volatile memory and operates adjustable reset timer (soaktimer), this is adjustable reset timer after engine stops when each scheduled time passes periodically conducting main relay 4. Therefore, ECU21 is constantly provided the cell voltage VB from battery 5 by dedicated wires 13_ATT. Sub-power source circuit 10 and 11 generates sub-voltage of supply V_OSAnd it is supplied to the RAM10 etc. of microcomputer 7. Driving circuit 3, primary source circuit 6 and sub-power source circuit 10 and 11 are configured to a power supply IC.

Conventional vehicle power operating device needs the lasting power supply of dedicated wires 13 to realize between battery 5 and ECU21, even if still can generate sub-voltage of supply V after ignition switch 2 is disconnected_OS. But, require that cost reduces and structure simplifies in recent years.

Except adopting main power voltage V_OM(5V), outside the main processing unit 8 carrying out operating, microcomputer 7 is also provided with and adopts sub-voltage of supply Vos(3V/3.3V) such as, carry out the low-tension circuit processing unit (RAM10) that operates. Therefore, sub-power source circuit 12 is supplied the voltage VB from battery 5 generate sub-voltage of supply V according to the connection by main relay 4_OS1(3.3V), and be supplied to the low-tension circuit processing unit comprising RAM10.

RAM10 stores the diagnostic data of various sensor, learning data etc., even and if must keep these data after ignition switch 2 is disconnected still lastingly. Sub-power source circuit 11 is according to being supplied the voltage V from battery 5 by dedicated wires 13_BATTGenerate sub-voltage of supply V_OS2(3V). Owing to sub-power source circuit 11 is only by sub-voltage of supply V_OS2It is supplied to RAM10, so it is so configured so that its outward current ability is lower than sub-power source circuit 12. When group power source circuit 12 is in constant voltage output operation, sub-power source circuit 11 stops output operation.

In order to control vehicular discharge with protection of the environment, solar obligation OBD(onboard diagnostic system) laws and rules come into force in each country. OBD is the equipment performing predetermined diagnosis process. When a failure is determined, this device storage also keeps the details of fault, and opens warning light to notify the driving mechanism of this equipment. The example of diagnosis item comprises that the accident rotten, engine of catalyzer is on fire, oxygen sensor or the defect of air-fuel ratio sensor and the defect of gas recirculation system (EGR). The data that the example of storage data is relevant with engine when comprising the relevant historical data of execution of the past to trouble diagnosis and break down.

When vehicle is sent to 0vehicle marketing business or serves service station because warning light is unlocked, usual failure diagnosis tool is connected to ECU21 and performs deep data analysis further. When repairing, when such as performing part replacement, diagnostic data and learning data are wiped and uses failure diagnosis tool by its initialize.

But, when environment does not allow to use failure diagnosis tool or vehicle not to be equipped with OBD, it may also be useful to simple data erase method. Disconnect the connection with ECU21 before battery 5 and again it is connected to ECU21. When hereafter ignition switch 2 is placed in IG-ON position, data are initialised. In this case, RAM10 and mirror image RAM(is not illustrated by main processing unit 8) in corresponding data compare, it is provided as one couple of RAM10 in microcomputer 7. When there is difference between these data, microcomputer 7 determines that battery 5 disconnects and data in RAM10 are unreliable and initialize RAM10.

In order to keep the data being stored in the RAM10 of ECU21, as described above, sub-power source circuit 11 must keep operation, even if when vehicle does not use. Each vehicle is equipped with other ECU except ECU21, and therefore in these ECU, the dark current (darkcurrent) of memory backup correspondingly increases. In order to process this problem, it may also be useful to conventional RAM replaced by nonvolatile memory (such as flash memory and EEPROM). But, when adopting nonvolatile memory to replace RAM10, do not wipe data by disconnecting battery 5.

The present invention has been made by considering problem above. It is an object of the invention to provide a kind of vehicle power operating device, wherein when the configuration adopting wherein data to be stored in nonvolatile memory (not being volatile memory), function below can be realized: by simply initialize process initialization data can be carried out, in this initialize process battery as ordinary method before disconnect and again connected afterwards.

Summary of the invention

Therefore it is an object of the invention to provide a kind of car-mounted electronic control device, it can be supplied power lastingly and need not use the dedicated wires being connected with battery.

It is a further object of the present invention to provide a kind of car-mounted electronic control device, its can by simply disconnect battery and connect and after again connect battery and carry out the data in initialize nonvolatile memory.

According to the first aspect of the invention, car-mounted electronic control device comprises: the first supply lead, and it is connected to the positive terminal of battery by ignition switch; 2nd supply lead, it is connected to the positive terminal of battery by the normally opened contact of power supply rly.; And the 3rd supply lead, it is connected to the positive terminal of battery by the coil of power supply rly.. This car-mounted electronic control device also comprises selection circuit and power source circuit. Selection circuit at least uses described 2nd supply lead and described 3rd supply lead as input, and from be used as input these supply leads voltage select maximum voltage and maximum voltage selected by exporting. Power source circuit generates predetermined power source voltage from the maximum voltage selected by selection circuit output.

According to the second aspect of the invention, car-mounted electronic control device is provided to be disconnected at battery when starting to operate connect and data in initialize nonvolatile memory after being again connected. This car-mounted electronic control device comprises power supply rise detection circuit, battery state retaining circuit and initialization control circuit. Power supply rise detection circuit exports reset signal in response to the voltage rise of lasting supply lead, and cell voltage supplied by this lasting supply lead when battery is connected lastingly. Battery state retaining circuit receives power supply from lasting supply lead, and for battery status signal being set to when reset signal is transfused to the first state and when asserts signal is transfused to afterwards, battery status signal is set to two-state. Initialization control circuit when adopting power supply to start to operate input from the battery status signal of battery state retaining circuit, and when the battery status signal inputted is in the first state the data in initialize nonvolatile memory and export asserts signal to battery state retaining circuit.

Accompanying drawing explanation

From, detailed description with reference to the accompanying drawings, the above and other object of the present invention, Characteristics and advantages will become more apparent. In the accompanying drawings:

Fig. 1 is the schematic circuit of car-mounted electronic control device according to a first embodiment of the present invention;

Fig. 2 is the schematic circuit of simple reference voltage generating circuit;

Fig. 3 is the schematic circuit of simple power source circuit;

Fig. 4 shows the oscillogram of the operation of the first embodiment;

Fig. 5 shows the oscillogram of the operation of the second embodiment of the present invention;

Fig. 6 is the schematic circuit of car-mounted electronic control device according to a third embodiment of the present invention;

Fig. 7 shows the oscillogram of the operation of the 3rd embodiment;

Fig. 8 is the schematic circuit of car-mounted electronic control device according to a fourth embodiment of the present invention;

Fig. 9 shows the oscillogram of the operation of the 4th embodiment;

Figure 10 is the schematic circuit of conventional vehicle power operating device;

Figure 11 is the schematic circuit of car-mounted electronic control device according to a fifth embodiment of the present invention;

Figure 12 is the schematic circuit of simple power source circuit;

Figure 13 shows the oscillogram of the operation of the 5th embodiment when battery is disconnected connection;

Figure 14 shows the schema of the initialization process to memory data;

Figure 15 is the schematic circuit of car-mounted electronic control device according to a sixth embodiment of the present invention;

Figure 16 shows the oscillogram of the operation of the 6th embodiment;

Figure 17 is the schematic circuit of car-mounted electronic control device according to a seventh embodiment of the present invention;

Figure 18 shows the oscillogram of the operation of the 7th embodiment;

The battery that Figure 19 shows eighth embodiment of the invention disconnects the block diagram detecting circuit;

Figure 20 is the schema of the process of initial diagnosis according to a ninth embodiment of the present invention;

Figure 21 is the schema of the process of the periodical diagnostic in the 9th embodiment;

Figure 22 shows the oscillogram of the operation of the 9th embodiment;

Figure 23 is the schema of the process of the periodical diagnostic according to the tenth embodiment;

Figure 24 is the schema of the process of periodical diagnostic according to a 11th embodiment of the present invention;

Figure 25 is the block diagram of the vehicle control system of use car-mounted electronic control device according to a 12th embodiment of the present invention; And

Figure 26 is the schema of the process of the periodical diagnostic according to the 12 embodiment.

Embodiment

Multiple embodiments shown in below with reference to accompanying drawings describe the present invention in detail. Below to, in the description of embodiment, substantially the same parts are by carrying out marking with identical reference label and omit description of them.

(the first embodiment)

With reference first to Fig. 1, vehicle is provided with ignition switch 2, this ignition switch 2 in response to this ignition switch 2 conducting and disconnection conducting and disconnection from the voltage of battery 5 and main relay (power supply rly.) 4.

Terminal 21a, 21b and 21c of electronically controlled equipment (ECU) 21 is the power supply terminal being provided in respectively in the first supply lead 22, the 2nd supply lead 23 and the 3rd supply lead 24. First supply lead 22 is connected to the positive terminal of battery 5 by ignition switch 2. 2nd supply lead 23 is connected to the positive terminal of battery 5 by normally opened contact (normallyopen) 4a of main relay 4. 3rd supply lead 24 is connected to the positive terminal of battery 5 by the coil 4b of main relay 4. The voltage of the first supply lead 22, the 2nd supply lead 23 and the 3rd supply lead is respectively by V_B1��V_B2And V_B3Represent. The voltmeter of battery 5 is illustrated as VB.

ECU21 comprises power unit 25 and microcomputer 7. The power unit 25 carrying out as vehicle power operating device operating is supplied the voltage from battery 5 generate main power voltage V based on by any one in the first supply lead 22, the 2nd supply lead 23 and the 3rd supply lead 24_OM, sub-voltage of supply Vos and simplify voltage of supply Vp. Power unit 25 is made up of power supply IC26, electrical condenser 27, diode 28,29 and Zener diode 30.

Electrical condenser 27 is connected between the 2nd supply lead 23 and ground, and avoids sub-voltage of supply Vos and the decline of simple voltage of supply Vp when ignition switch 2 is disconnected, and this will be described later. Reversible circulation avoided by the diode 29 being arranged in the 3rd supply lead 24. The Zener diode 30 provided between the 2nd supply lead 23 and ground limits the surge voltage (surgevoltage) etc. produced by load dump (loaddump).

In power supply IC26, timer (delay circuit) 31 and rly. (relay) pilot circuit 32 adopt the voltage V of the first supply lead 22_B1Operate. Timer 31 is at the voltage V of ignition switch 2 conducting and the first supply lead 22_B1During rising, after the scheduled time passes, export and drive permission signal Sd to Control circuit 32. The scheduled time is until the flutter of ignition switch 2 stops and the voltage V of the first supply lead 22_B1It is stabilized to the time till cell voltage VB. When drive allow signal Sd to input time, Control circuit 32 conducting MOSFET33 thus conducting main relay 4. Even if after ignition switch 2 is disconnected, Control circuit 32 still keeps MOSFET33 conducting, as long as have input power supply holding signal Sh from microcomputer 7.

Selection circuit 34 uses supply lead 22,23 and 24 as input, and selects a supply lead with maximum voltage from them. Afterwards, it exports selected voltage V to supply lead 35_B(SEL)Especially, (voltage reduced by the forward voltage Vf of diode 34a to 34c). Selection circuit 34 is made up of three diodes 34a, 34b and 34c, and their negative electrode and anode are connected respectively to supply lead 35 and supply lead 22,23 and 24.

Power supply IC26 comprises primary source circuit 36, sub-power source circuit 37 and simple power source circuit 38. Primary source circuit 36 is transfused to the voltage V of the 2nd supply lead 23_B2, and generate main power voltage V_OMThe main processing unit 8 of the CPU comprising microcomputer 7 for operating. Primary source circuit 36 is configured to regulation of series device (seriesregulator), and this regulation of series device is by reference voltage generating circuit 39(bandgap reference (bandgapreference)), operational amplifier 40, transistor 41 and dividing potential drop resistor 42a, 42b(voltage detecting circuit 42) form.

In sub-power source circuit 37, two sub-power source circuit 37a and 37b are connected in parallel. Sub-power source circuit 37a has been transfused to the voltage V of the 2nd supply lead 23_B2. Sub-power source circuit 37b has been transfused to the voltage V of supply lead 35_B(SEL). It generates sub-voltage of supply Vos, and to operate such as RAM10(, it needs to continue supply power to store the volatile memory of data) and so on circuit. Sub-power source circuit 37a is regulation of series device, and it is by reference voltage generating circuit 39, operational amplifier 43, resistor 44 and dividing potential drop resistor 45a to 45c(voltage detecting circuit 45) form.

Sub-power source circuit 37b is regulation of series device, and it is made up of to generate simple reference voltage Vr simple reference voltage generating circuit 46, operational amplifier 47, resistor 48 and dividing potential drop resistor 45a to 45c. As shown in Figure 2, simple reference voltage generating circuit 46 is made up of continuous current circuit 49, Zener diode 50,51 and resistor 52,53, and Zener diode 50,51 adopts reversed polarity connection and is connected in series.

Simple power source circuit 38 has been transfused to the voltage V of supply lead 35_B(SEL), and generate the simple voltage of supply Vp for operating adjustable reset timer (soaktimer) 54. As shown in Figure 3, simple power source circuit 38 by continuous current circuit 55, Zener diode 56,57, resistor 58 and resistor 59 form, Zener diode 56,57 adopts reversed polarity connection and is connected in series. When the Zener voltage of Zener diode 56,57 is set to 5V, output is the simple voltage of supply Vp of 5V substantially. Adjustable reset timer 54 after engine stops when each scheduled time passes periodically conducting main relay 4.

It is the voltage V adopting supply lead 35 that battery disconnects detection circuit 60_B(SEL)Carry out operating and based on voltage V_B(SEL)Detect the circuit whether battery 5 disconnects.

First embodiment operates as shown in Figure 4, and wherein, Fig. 4 shows the connection state of battery 5, the voltage V of the first supply lead 22_B1, the 3rd supply lead 24 voltage V_B3And the 2nd voltage V of supply lead 23_B2. When battery 5 disconnects with ignition switch 2 and main relay 4, main power equipment 25 can not generate any voltage of supply and can not power to microcomputer 7. Therefore, the data being once stored in RAM10 lost.

When battery 5 is when moment t1, place was electrically connected to ignition switch 2 and main relay 4, the voltage V of the 3rd supply lead 24_B3The voltage close to cell voltage VB is risen to by the coil 4b of main relay 4. In this moment, ignition switch 2 is still in disconnection state, and main relay 4 is also still in disconnection state. Therefore, the voltage V of the first supply lead 22_B1With the voltage V of the 2nd supply lead 23_B2It is all 0V. Therefore, it does not have generate main power voltage V_OMAnd MOSFET33 is also in disconnection state.

Selection circuit 34 selects the supply lead with maximum voltage from supply lead 22,23 and 24. That is, the diode 34c of the coil 4b being connected to main relay 4 is energized, thus is supplied the voltage of supply VB of battery 5 to supply lead 35 by coil 4b and diode 29,34c. Meanwhile, it may also be useful to the voltage V of supply lead 35_B(SEL)Sub-power source circuit 37b and simple power source circuit 38 as input start operation, and export sub-voltage of supply V respectively_OSWith simple voltage of supply Vp. As a result, the data in RAM10 are kept. In addition, adjustable reset timer 54 and battery disconnect detection circuit 60 also start operation.

In this case, the electric current that aforesaid operations produces is by the coil 4b of main relay 4. But, as long as the voltage lower than operating voltage is applied to coil 4a, the normally opened contact 4a of main relay 4 will be retained as disconnection. Therefore, when above-mentioned working current is less than (operating voltage/coil resistance), it is possible to supply working current by coil 4b and need not conducting main relay 4. The current draw that RAM10, adjustable reset timer 54, battery disconnect detection circuit 60 etc. is all very little, and therefore main relay does not have conducting.

When ignition switch 2 is when the place's conducting of moment t2, the first supply lead 22 is connected to battery 5 by ignition switch 2. Now, there will be flutter (chattering) at the contact place of ignition switch 2. When flutter occurs during Control circuit 32 conducting MOSFET33, the voltage V of the 3rd supply lead 24_B3To substantially be turned into 0V. The voltage V of the first supply lead 22_B1Also will turn into 0V temporarily. Therefore, supply lead 35 is by the voltage V of selection circuit 34_B(SEL)Interim decline.

Therefore, after ignition switch 2 conducting, after following situation occurs, timer 31 exports to drive to Control circuit 32 and allows signal Sd: flutter stops and the voltage V of enough first supply leads 22_B1The scheduled time being stabilized to cell voltage VB passes. Control circuit 32 allows the input of signal Sd to carry out conducting MOSFET33(moment t3 in response to driving). Selection circuit 34 selects first supply lead 22 with maximum voltage from supply lead 22 to 24. That is, diode 34a is energized, and supplies the cell voltage VB of battery 5 by ignition switch 2 and diode 34a to supply lead 35.

When the coil 4b of main relay 4 is energized, normally opened contact 4a is closed after the operating time of rly., and the 2nd supply lead 23 is supplied cell voltage VB(moment t4). Primary source circuit 36 and sub-power source circuit 37a have been transfused to the voltage V of the 2nd supply lead 23_B2And generate main power voltage V respectively_OMWith sub-voltage of supply Vos. Main power voltage V_OMThe main processing unit 8 being supplied to microcomputer 7, thus the main power circuit of microcomputer 7 (comprising CPU) starts respective operation. Selection circuit 34 selects the first supply lead 22 or the 2nd supply lead 23, and by the voltage V of supply lead 35_B(SEL)Remain on cell voltage VB place. The output voltage of sub-power source circuit 37a is set to the value of the output voltage slightly higher than sub-power source circuit 37b by dividing potential drop resistor 45a to 45c. Therefore, when group power source circuit 37a is supplied the voltage of supply from the 2nd supply lead 23 and starts its operation, the output of sub-power source circuit 37b is disconnected.

When ignition switch 2 is when moment t5, place disconnected, it is interrupted to the power supply of the first supply lead 22. But, when from microcomputer 7 input power holding signal Sh, Control circuit 32 keeps conducting MOSFET33 with the use of the voltage of the power supply holding signal Sh as voltage of supply. This period (moment t5 to t6) period, selection circuit 34 select the 2nd supply lead 23 and by the voltage V of supply lead 35_B(SEL)Remain on cell voltage VB place.

When microcomputer 7 is hereafter when moment t7, place stopped the output of power supply holding signal Sh, Control circuit 32 disconnects MOSFET33. When the energising of the coil 4b of main relay 4 is stopped, the voltage V of the 3rd supply lead 24_B3Again substantially rise to cell voltage VB. Meanwhile, when after being stopped in the energising of coil 4b, the time of recovery of rly. passes, normally opened contact 4a is opened and is interrupted to the power supply of the 2nd supply lead 23. Therefore, primary source circuit 36 and sub-power source circuit 37a stop respective operation.

When this switching, the voltage V at the 3rd supply lead 24 avoided by the electrical condenser 27 being connected between the 2nd supply lead 23 and ground_B3Fully rise the voltage V as supply lead 35_B(SEL)There is the voltage V of the 2nd supply lead 23 before_B2Decline. At moment t7, selection circuit 34 selects the 3rd supply lead 24 to replace the 2nd supply lead 23, and by the voltage V of supply lead 35_B(SEL)Remain on cell voltage VB place. After battery 5 when moment t8, place disconnected, it is interrupted to the power supply of each supply lead 22 to 24, thus the voltage V of supply lead 35_B(SEL)Also 0V is turned into.

As mentioned above, it is necessary, power unit 25 comprises selection circuit 34, this selection circuit has been transfused to the voltage V of the first supply lead 22 being connected to battery 5 by ignition switch 2_B1, be connected to the voltage V of the 2nd supply lead 23 of battery 5 by the normally opened contact 4a of main relay 4_B2And the voltage V of the 3rd supply lead 24 of battery 5 it is connected to by the coil 4b of main relay 4_B3. Afterwards, it is from selecting maximum voltage among them.

As long as battery 5 is connected, voltage V_B1��V_B2And V_B3In at least one voltage be just maintained at cell voltage VB or the voltage close to VB. Therefore, selection circuit 34 can supply cell voltage VB or the voltage close to VB with continuing to supply lead 35, and the state regardless of ignition switch 2. Therefore, its power supply that needs can be kept lasting is to realize the operation of the circuit (such as RAM10, adjustable reset timer 54 and battery disconnect detection circuit 60) of respective operation. In this case, it is not necessary to dedicated wires connects battery 5 and ECU21 also continues power supply, therefore, it is possible to reduce the cost of whole power unit 25 and strengthen its reliability.

When ignition switch 2 conducting, it is pending that Control circuit 32 allows signal Sd to perform etc. based on the driving from timer 31. That is, it waits the voltage V at least the first supply lead 22_B1It is stabilized to for some time during cell voltage VB, and conducting main relay 4 afterwards. As a result, even if there is flutter, the voltage V of the 3rd supply lead 24 at the contact place of ignition switch 2_B3Still can at the voltage V that supply lead 35 occurs to be supplied as during flutter_B(SEL). Accordingly, it may be possible to realize stable lasting power supply.

Electrical condenser 27 is provided between the 2nd supply lead 23 and ground, with the volts lost postponed in the 2nd supply lead 23. Be disconnected to sub-power source circuit 37b from main relay 4 and simple power source circuit 38 become can by, during period of generating predetermined power source voltage Vos and Vp from the power supply of the 3rd supply lead 24, this electrical condenser 27 be by the voltage V of the 2nd supply lead 23_B2Remain enough for generating predetermined voltage of supply Vos and Vp. This makes it possible to be avoided the voltage V of supply lead 35 when ignition switch 2 disconnects_B(SEL)Decline.

(the 2nd embodiment)

Except the configuration relevant from engine start is different and the timer 31 shown in Fig. 1 is not provided in power unit 25, the 2nd embodiment is similar to the first embodiment.

Engine startup system in 2nd embodiment once starts (one-push) system, and wherein, engine is started or stoped by the user operating in vehicle the button engine start switch provided. When engine start switch (ignition switch of equivalence in the first embodiment) is pressed, triggering signal is sent to power unit, thus power unit transmits engine start request signal to authentication control unit. The main ID of the user ID of handheld device and vehicle is checked by authentication control unit, and allows igniting when they match each other. The configuration of this engine startup system is well-known, therefore will not be described in detail.

2nd embodiment operates as shown in Figure 5. This operation is different from the operation of the first embodiment (Fig. 4), because the voltage V of the first supply lead 22_B1It it is the square wave not having flutter based on triggering signal described above. When engine start switch is pressed, the voltage V of the first supply lead 22_B1Moment t12 place rises to cell voltage, Control circuit 32 conducting MOSFET33 immediately. In a second embodiment, that is, timer 31 does not need.

When the coil 4b of main relay 4 is energized, normally opened contact 4a is closed after the operating time of rly., and the 2nd supply lead 23 is supplied cell voltage VB(moment t13). But, moment t13 that normally opened contact 4a is closed must be in the voltage V of the first supply lead 22_B1It is maintained in the period at cell voltage VB place (high level period). The operation located in moment t13 to t17 is identical with the operation that moment t4 to t8 shown in Fig. 4 is located respectively. Therefore, the 2nd embodiment provides similar operation and identical with the effect of the first embodiment.

(the 3rd embodiment)

Except power unit 25 as shown in Figure 6, not used for the timer of Control circuit 32 and except selection circuit 34 is not connected to the diode of supply lead 22, the 3rd embodiment is similar to the first embodiment (Fig. 1).

Selection circuit 34 uses supply lead 23 and 24 as input, and from selecting the supply lead with more high-voltage among them. It is to supply lead 35(output line) export selected by voltage V_B(SEL)Especially, (voltage that the forward voltage Vf of diode 34a, 34c reduces). Electrical condenser 64 is connected between supply lead 35 and ground, and it is positioned at the outside of power supply IC26. As the voltage V of the first supply lead 22_B1During rising, Control circuit 32 conducting MOSFET33 is with conducting main relay 4.

3rd embodiment operates as shown in Figure 7. When battery 5 is when moment t21, place was electrically connected, selection circuit 34 selects the supply lead 24 with more high-voltage from supply lead 23 and 24. That is, supply the cell voltage VB of battery 5 by diode 29 and the 34c of coil 4b and supply lead 24 to supply lead 35. Now, the electrical condenser 64 being connected to supply lead 35 is charged to cell voltage VB.

When ignition switch 2 is when the place's conducting of moment t22, the first supply lead 22 is connected to battery 5 by ignition switch 2. Control circuit 32 is in response to the voltage V of the first supply lead 22_B1Carry out conducting MOSFET33(moment t23). As a result, the voltage V of the 3rd supply lead 24_B3Substantially 0V is dropped to, and the coil 4b of main relay 4 is energized. Normally opened contact 4a is closed by this energising, and cell voltage VB was supplied to for the 2nd supply lead 23(moment t24). After moment t24, selection circuit 34 selects the 2nd supply lead 23.

At the voltage V of the 3rd supply lead 24_B3After moment t23, place dropped to 0V substantially, from moment t24 to the voltage V of the 2nd supply lead 23_B2During being stabilized to the period of cell voltage VB, the voltage supplied from supply lead 23 and 24 is temporarily interrupted. But, the electrical condenser 64 being charged to cell voltage VB is connected between supply lead 35 and ground. As a result, the voltage V of supply lead 35_B(SEL)It is kept, thus simple power source circuit 38 generates adjustable reset timer 54 operates required simple voltage of supply Vp and sub-power source circuit 37b exports for keeping the voltage needed for the data in RAM10.

When ignition switch 2 the moment t25 place disconnect and microcomputer 7 the moment t26 place stopping out-put supply holding signal Sh time, Control circuit 32 disconnects MOSFTE33. When therefore the energising of the coil 4b of main relay 4 is stopped, the voltage V of the 3rd supply lead 24_B3Again substantially rise to cell voltage VB. Meanwhile, when after being stopped in the energising of coil 4b, the time of recovery of rly. passes, normally opened contact 4a is opened and is interrupted to the power supply of the 2nd supply lead 23.

When this switching, electrical condenser 27 is at the power supply V of the 3rd supply lead 24_B3Fully rise the voltage V as supply lead 35_B(SEL)Avoid the voltage V of the 2nd supply lead 23 before_B2Decline. Even if the voltage V of the 2nd supply lead 23_B2At the voltage V of the 3rd supply lead 24_B3Decline before fully rising, the electrical condenser 64 being connected to supply lead 35 still can avoid the voltage V of supply lead 35_B(SEL)Decline. After moment t27, selection circuit 34 selects the 3rd supply lead 24 by the voltage V of supply lead 35_B(SEL)Remain on cell voltage VB place. After battery 5 when moment t28, place was disconnected connection, it is interrupted to the power supply of supply lead 23 and 24, thus the voltage V of supply lead 35_B(SEL)Also little by little fall for 0V.

As mentioned above, it is necessary, power unit 25 is provided with selection circuit 34. It has been transfused to the voltage V that the normally opened contact 4a by main relay 4 is connected to the 2nd supply lead 23 of battery 5_B2And the voltage V of the 3rd supply lead 24 of battery 5 it is connected to by the coil 4b of main relay 4_B3. Afterwards, it selects higher voltage between which.

When the relay operation time (namely from the energising of the coil 4b of main relay 4 to normally opened contact 4a closed) very in short-term, as long as battery 5 is connected, voltage V_B2And V_B3In any voltage be just maintained at cell voltage VB or the voltage place close to VB. Therefore, selection circuit 34 can supply cell voltage VB or the voltage close to VB with continuing to supply lead 35, and the state regardless of ignition switch 2. Therefore, it can continue the circuit that ground manipulation require continues power supply, and such as RAM10, adjustable reset timer 54 and battery disconnect detection circuit 60. Therefore, the 3rd embodiment can when not needing conventional dedicated wires (it connects battery 5 and ECU21 for lasting power supply) to operate. Therefore, this can reduce the cost of whole power unit 25 and strengthen reliability.

Electrical condenser 64 is provided between the supply lead 35 of the output line as selection circuit 34 and ground. This electrical condenser 64 make be driven to sub-power source circuit 37b from main relay 4 and simple power source circuit 38 become can by, during period of generating predetermined power source voltage Vos and Vp from the power supply of the 2nd supply lead 23, the output voltage of selection circuit 34 be enough for generating voltage of supply Vos and Vp. This makes it possible to be avoided the voltage V of supply lead 35 when ignition switch 2 conducting_B(SEL)Decline. And, when main relay 4 disconnects, the voltage V of supply lead 35 avoided by electrical condenser 64_B(SEL)Decline. Therefore, in the 3rd embodiment providing electrical condenser 64, electrical condenser 37 is can elliptical.

(the 4th embodiment)

Power supply terminal 21d is additionally provided as shown in Figure 8 except power supply terminal 21a, 21b and 21c, so that power supply terminal 21 is from another ECU(such as, main body ECU) input wake-up signal WAKE, the 4th embodiment is similar to the first embodiment. In addition, provide diode 72 and 73 to avoid reversible circulation with " or door " circuit.

Such as, when performing door lock releasing operation (namely door unlocks) or when performing the operation that door key is inserted door key hole, it is possible to export wake-up signal WAKE. It is by vehicle-mounted LAN(such as CAN(controller zone network)) carry out communicating and being sent to ECU21. Although not illustrating, but wake-up signal WAKE is converted into the pulse voltage signal of the amplitude with voltage VB and is supplied to the first supply lead 22.

3rd embodiment operates as shown in Figure 9. This operation is different from the operation of the first embodiment (Fig. 4), because the voltage V of the first supply lead 22_B1There is the single pulse waveforms not having flutter based on wake-up signal WAKE. As the voltage V of the first supply lead 22_B1By wake-up signal WAKE when moment t32, place was thus lifted to cell voltage, Control circuit 32 allows signal Sd to carry out conducting MOSFET33 based on the driving exported from timer 31.

When the coil 4b of main relay 4 is energized, normally opened contact 4a disconnects after the operating time of rly. and cell voltage VB is supplied to (the moment t34) of the 2nd supply lead 23. But, moment t34 that normally opened contact 4a disconnects must be in the voltage V of the first supply lead 22_B1It is maintained in the period at cell voltage VB place (high level period). And after wake-up signal WAKE declines (after moment t35), as long as have input power supply holding signal Sh from microcomputer 7, Control circuit 32 just keeps MOSFET33 conducting. Those operations that the operation located in moment t36 to t38 is located with moment t6 to t8 in the first embodiment (Fig. 4) respectively are identical. According to the 4th embodiment, even if when receiving wake-up signal WAKE from another ECU thus recover from standby state, the operation similar with the first embodiment and effect also can be provided.

(modified example)

First and the 4th in embodiment, timer 31 can omit in the following cases: when ignition switch 2 conducting, the voltage of the first supply lead 22 can sufficiently early stablize (because there is not flutter in ignition switch 2 or flutter very short); And the voltage V at the first supply lead 22_B1With the voltage V of the 3rd supply lead 24_B3When declining simultaneously.

Timer 31 also for avoid Control circuit 32 in the short cycle repeatedly conducting and disconnect MOSFET33, even when there is flutter in the contact place of ignition switch 2. According to this viewpoint, also wish to provide in the third embodiment timer 31.

In first, second and the 4th embodiment, the electrical condenser 27 maintaining circuit as voltage can omit in the following cases: stops the coil 4b to main relay 4 and is energized; The voltage V of the 2nd supply lead 23_B2At the voltage V of the 3rd supply lead 24_B2Fully rise to the voltage V of supply lead 35_B(SEL)Decline afterwards.

In the third embodiment, when the relay operation time (namely from the energising of the coil 4b of main relay 4 to normally opened contact 4a disconnect) very in short-term, from the voltage V of the 3rd supply lead 24_B3The voltage V declining and starting to the 2nd supply lead 23_B2Time till rising is also shortened. In this case, when not providing electrical condenser 64, the voltage V of supply lead 35_B(SEL)The time declined from cell voltage VB has been shortened. Sub-power source circuit 37b, simple power source circuit 38 and microcomputer 7 are all provided with level and smooth or filter condenser usually, for regulated supply voltage. Therefore, even if at the voltage V of supply lead 35_B(SEL)Middle occurred that voltage a little falls temporarily, and the data in RAM10 still can be maintained. Therefore, electrical condenser 64 can provide as required.

And in first, second and the 4th embodiment, electrical condenser 64 can be provided between supply lead 35 and ground. Timer 31 and electrical condenser 27 can omit, as long as the volts lost in supply lead 35 can be avoided by electrical condenser 64.

Selection circuit needs not to be the selection circuit 34 that the diode 34a to 34c connected by " or door " is formed. Can otherwise configure selection circuit, such as, the switch circuit being configured to use transistor, as long as supply lead 22,23 and 24 or supply lead 23 and 24 can be used as input and select the circuit with the supply lead of maximum voltage from them by this selection circuit.

Delay circuit needs not to be timer 31. It can be such as delay unit based on passive element, unicircuit or counter.

(the 5th embodiment)

As shown in figure 11, wherein, electronically controlled equipment (ECU) 21 is provided for the vehicle power operating device of controlling combustion engine to 5th embodiment. ECU21 is connected to the ignition switch 123 for the voltage of the battery 5 that is turned on or off is supplied. ECU21 is also connected to main relay (power supply rly.) 124, and this main relay 124 is turned on or off respectively in response to ignition switch 123 conducting and disconnection.

First to fourth terminal 21a, 21b, 21c and 21d of ECU21 is the power supply terminal being provided at first to fourth supply lead 125,126,127 and 128 respectively. First supply lead 125 is connected to the positive terminal of battery 5 by ignition switch 123. 2nd supply lead 126 is connected to the positive terminal of battery 5 by the normally opened contact 124a of main relay 124. 3rd supply lead 127 is connected to the positive terminal of battery 5 by the coil 124b of main relay 124. 4th supply lead 128 is directly connected to the positive terminal of battery 5, and is the lasting supply lead continuing to supply cell voltage VB when battery 5 is connected to ECU21. The voltage of supply lead 125,126,127 and 128 is respectively by V_B1��V_B2��V_B3And V_BATTRepresent.

Diode 129 and Zener diode 130 are connected in parallel between the 2nd supply lead 126 and ground. Zener diode 130 limits the surge voltage produced by load dump etc. Reversible circulation avoided by the diode 131 being arranged in supply lead 127.

ECU21 is including as the power supply IC132 of vehicle power operating device and microcomputer 133. Power supply IC132 is based on the voltage V of supply lead 126_B2Generate main power voltage V_OM(5V) with sub-voltage of supply Vos(3.3V), and it is supplied to microcomputer 133. When ignition switch 123 conducting, carry out conducting main relay 124 by Control circuit 136 and MOSFET137. In addition, before ignition switch 123 conducting, export the battery status signal Sb being used to indicate battery 5 and whether disconnecting with ECU21 to microcomputer 133.

Microcomputer 133 comprises main processing unit 134, and main processing unit 134 comprises CPU and is used as to adopt main power voltage V_OMInitialization control circuit. Microcomputer 133 also comprises low-tension circuit processing unit, and this low-tension circuit processing unit comprises flash memory (nonvolatile memory) 135 and adopts sub-voltage of supply Vos to operate. Flash memory 135 stores diagnostic data and learning data, and flash memory carries out the initialization process that describes below. The engine control program etc. not carrying out initialization process is stored in another flash memory (not shown).

In power supply IC132, Control circuit 136 adopts the voltage V of supply lead 125_B1Operate. When driving permission signal Sd to turn into high level, conducting MOSFET137 is with conducting main relay 124. In the 5th embodiment, voltage V_B1It is used as to drive and allows signal Sd. Control circuit 136 is configured at voltage V_B1Conducting MOSFET137 immediately during rising. Control circuit 136 is configured to: even if after ignition switch 123 disconnects, as long as from microcomputer 133 input power holding signal Sh, still keeps MOSFET137 conducting.

Primary source circuit 138 has been transfused to the voltage V of the 2nd supply lead 126_B2, and generate main power voltage V_OMFor the main processing unit 134 of operation microcomputer 133. Primary source circuit 138 is configured to regulation of series device, and this regulation of series device is by reference voltage generating circuit 139(bandgap reference), operational amplifier 140, transistor 141 and the dividing potential drop circuit 142 that formed by resistor 142a and 142b form.

Sub-power source circuit 143 has been transfused to the voltage V of the 2nd supply lead 126_B2, and generate sub-voltage of supply Vos for operation low-tension circuit processing unit (comprising the flash memory 135 of microcomputer 133). Sub-power source circuit 143 is configured to regulation of series device, and this regulation of series device is made up of reference voltage generating circuit 139, operational amplifier 144, transistor 145 and the voltage detecting circuit 146 that formed by dividing potential drop resistor 146a and 146b.

Simple power source circuit 147 has been transfused to the voltage V of supply lead 128_BATT, and generate simple voltage of supply V_p1And it is supplied to adjustable reset timer 148. Simple power source circuit 149 has been transfused to the voltage V of supply lead 128_BATT, and generate simple voltage of supply V_p2(control voltage of supply) is also supplied to the latch cicuit 150 and power-on reset circuit 151 that describe below. As shown in figure 12, these simple power source circuits 147 and 149 are made up of continuous current circuit 152, Zener diode 153 and 154, resistor 155 and resistor 156, and Zener diode 153 and 154 adopts reversed polarity connection and is connected in series. When the Zener voltage of Zener diode 153 and 154 is set to 5V, they export the simple voltage of supply V of substantially 5V_p1And V_p2. Adjustable reset timer 148 after ignition switch 123 disconnects when each scheduled time passes periodically conducting main relay 124.

Latch cicuit 150, power-on reset circuit 151 and microcomputer 133 form battery and disconnect detection circuit, and the latter was used for before ignition switch 123 conducting, and whether detection battery 5 disconnects with ECU21. Power-on reset circuit 151 is power supply rise detection circuit, and it is in response to the simple voltage of supply V exported by simple power source circuit 149_p2Rising export reset signal Sr. When the battery 5 being once disconnected connection again connected and as the voltage V of the supply lead 128 continuing supply lead_BATTDuring rising, simple voltage of supply V_p2Rise.

Latch cicuit 150 is battery state retaining circuit. Latch cicuit 150 receives simple voltage of supply V_p2Indicate as reseting input signal/R(/R as latch control signal L and reset signal Sr as voltage of supply and data input signal D, the asserts signal Ss that exports from the main processing unit 134 of microcomputer 133 that R's is inverse). Latch cicuit 150 exports the battery status signal Sb from inverse output terminal/Q. When latch control signal L is in high level, latch cicuit 150 directly exports the reverse signal of data input signal D from inverse output terminal/Q. When latch control signal L is converted to lower level, it keeps the reverse signal of data input signal D in that moment and it is exported from inverse output terminal/Q. From the high level equivalence of the battery status signal Sb of inverse output terminal/Q output in the first state, and lower level equivalence is in two-state. Asserts signal Ss is drawn low by resistor 157.

5th embodiment operates as shown in Figure 13 and 14. As mentioned above, it is necessary, the ECU21 observing the vehicle of OBD laws and rules performs predetermined diagnostic process. When a failure is determined, it is necessary in flash memory 135, store diagnostic data and learning data and open warning light. The ECU21 of the vehicle not observing OBD laws and rules also stores diagnostic data and learning data in flash memory 135, identifies fault state to help.

When fault occur in vehicle and retailer or serve place of service station perform repair time, it is necessary to the diagnostic data that initialize is stored in flash memory 135 and learning data. Here the data initialize mentioned refers to the erasing of data and/or the setting of initial value. ECU21 can perform simple initial method. For, in the initialization process of memory data, battery 5 once disconnected with ECU21, and again connected afterwards, data can be carried out initialize when ignition switch 123 is switched on afterwards. For each embodiment described later, also should be identical for the initial method of memory data.

Figure 13 shows the reset signal Sr of generation when the battery 5 once disconnected is again connected to ECU21, the waveform of battery status signal Sb and asserts signal Ss. When battery 5 is when moment ta, place was connected to ECU21, simple power source circuit 149 uses the voltage V of supply lead 128_BATTAs inputting and generate simple voltage of supply V_p2. Latch cicuit 150 and power-on reset circuit 151 can pass through this simple voltage of supply V_p2Operate. Power-on reset circuit 151 makes reset signal Sr turn into lower level during the period of the tb from moment ta to the moment. As a result, latch cicuit 150 is reset, and exports to carry out pilot cell 5 as the battery status signal Sb of high level (the first state) and disconnect.

Hereafter when key of lighting a fire is inserted in the key hole of vehicle and key rotor (keyrotor) is set to IGON position, ignition switch 123 conducting. Control circuit 136 immediately conducting MOSFET137 and power supply IC132 conducting main relay 124 to supply main power voltage V to microcomputer 133_OMWith sub-voltage of supply Vos. When reset signal by power-on reset circuit (not shown) for seasonable, microcomputer 133 starts operation.

The main processing unit 134 of microcomputer 133 performs the initialization process to memory data as shown in Figure 14, as the initialize routine when operating beginning. Input the battery status signal Sb(step S1 from power supply IC132), and check whether this signal is in high level (step S2). When this signal is in high level (YES), the data (all data or particular data) (step S3) that the initialize of main processing unit 134 is stored in flash memory 135. Hereafter, moment tc place in fig. 13, main processing unit 134 exports pulse sets signal Ss(step S4 to power supply IC132). As a result, latch cicuit 150 is set and battery status signal Sb turns into lower level (two-state) carrys out pilot cell 5 and do not disconnect.

Hereafter, when ignition switch 123 is disconnected, it is interrupted to the power supply of microcomputer 133. But, owing to supply lead 128 is continuously fed with cell voltage VB, so latch cicuit 150 continues to export low level battery status signal Sb. When ignition switch 123 is by conducting again, memory data is performed initialization process above by microcomputer 133 again. Now, the battery status signal Sb of input is in lower level. Therefore, make the determination of "No" in step S2 place, and do not perform the initialization process to flash memory 135. That is, only after battery is disconnected connection and is again connected, after ignition switch 123 is initially turned on, just immediately flash memory 135 is performed initialization process.

According to the 5th embodiment, diagnostic data and learning data are stored in the flash memory 135 as nonvolatile memory. This make sub-power source circuit 51 do not need from conventional ECU(wherein data be stored in RAM) (Figure 10) different. As a result, the dark current passed through during ignition switch 123 disconnects significantly reduces, and can reduce the die size of power supply IC132.

With the use of the technology identical with adopting the conventional ECU of RAM, after once disconnecting with ECU21 at battery 5 and be again connected during ignition switch 123 conducting, the diagnostic data being stored in flash memory 135 and learning data can be appropriately initialized and can not produce error.

(the 6th embodiment)

6th embodiment is as shown in Figure 15 and Figure 16. In the sixth embodiment, as shown in figure 15, it does not have provide directly or lastingly connect the dedicated wires (supply lead 128 in Figure 11) of ECU21 and battery 5. ECU21 has the function identical with the 5th embodiment (Figure 11). But, the configuration of their power supply IC132 is different and electrical condenser 162 is connected between supply lead 126 and ground.

Power supply IC132 generates main power voltage V based on the supply by the 2nd supply lead 126 from the voltage of battery 5_OMWith sub-voltage of supply Vos. It is supplied the voltage from battery 5 generate simple voltage of supply V based on by any one in first, second, and third supply lead 125,126 and 127_pl��V_p2��

Selection circuit 163 uses the first supply lead 125, the 2nd supply lead 126 and the 3rd supply lead 127 as input, and selects the supply lead with maximum voltage from them. Afterwards, selection circuit 163 exports selected voltage V to supply lead 164_B(SEL)More accurately, (maximum voltage that the forward voltage Vf of diode 163a, 163b and 163c reduces). It is connected to the lasting supply lead that ECU21 just supplies cell voltage VB lastingly as long as supply lead 164 is battery 5. Selection circuit 163 is made up of three diodes 163a, 163b and 163c, and their negative electrode is connected to their anode of supply lead 164 and is then connected respectively to supply lead 125,126 and 127. Diode 163a, 163b and 163c connect with the structure of " or door " circuit.

Timer (delay circuit) 165 adopts the voltage V of the first supply lead 125_B1Operate. When ignition switch 123 conducting thus the voltage V of the first supply lead 125_B1During rising, the flutter in ignition switch 123 stops and a certain time passes and the voltage V of the first supply lead 125_B1After being stabilized to cell voltage VB, timer 165 exports to drive to Control circuit 136 and allows signal Sd. When input queued switches allows signal Sd, Control circuit 136 conducting MOSFET137 thus conducting main relay 124.

6th embodiment operates as shown in Figure 16, and wherein, Figure 16 shows the connection state of battery 5, the voltage V of the first supply lead 125_B1, the 3rd supply lead 127 voltage V_B3And the 2nd voltage V of supply lead 126_B2Waveform. When battery 5 in moment t41 from when disconnecting stateful connection to ECU21, the voltage V of the 3rd supply lead 127_B3The voltage close to cell voltage VB is become by the coil 124b of main relay 124. Now, ignition switch 123 is disconnected and main relay 124 is also disconnected. Therefore, the voltage V of the first supply lead 125_B1With the voltage V of the 2nd supply lead 126_B2It is all 0V. Therefore, it does not have generate main power voltage V_OMOr sub-voltage of supply Vos and MOSFET137 is also in disconnection state.

Selection circuit 163 selects the supply lead with maximum voltage from supply lead 125,126 and 127. That is, diode 163c is energized, and supplies the cell voltage VB of battery 5 by coil 124b and diode 131 and 163c to supply lead 164. What meanwhile occur is, it may also be useful to the voltage V of supply lead 164_B(SEL)Simple power source circuit 147 and 149 start operation and export simple voltage of supply V respectively_plAnd V_p2��

Moment t1 is corresponding to the moment ta shown in Figure 13, and latch cicuit 150 and power-on reset circuit 151 become to adopt simple voltage of supply V afterwards_p2Operate. Now, power-on reset circuit 151 exports low level reset signal Sr. As a result, latch cicuit 150 is reset, and the battery status signal Sb exporting high level (the first state) carrys out pilot cell 5 disconnects.

In this case, the electric current that aforesaid operations produces is by the coil 124b of main relay 124. But, in main relay 124, as long as the voltage lower than operating voltage is applied to coil 124b, normally opened contact 124a just keeps open circuit. Therefore, when above-mentioned working current is less than (operating voltage/coil resistance), it is possible to supply working current by coil 124b and need not conducting main relay 124. Adjustable reset timer 148, latch cicuit 150 and power-on reset circuit 151 etc. all consume only a small amount of electric current, therefore main relay 124 not conducting.

Hereafter when ignition switch 123 is when the place's conducting of moment t42, the first supply lead 125 is connected to battery 5 by ignition switch 123. Now, there will be flutter at the contact place of ignition switch 123. When flutter occurs during Control circuit 136 conducting MOSFET137, the voltage V of the first supply lead 125_B1Likely turn into 0V temporarily, and the voltage V of the 3rd supply lead 127_B3Being lowered to basic is 0V. Therefore, supply lead 164 is by the voltage V of selection circuit 163_B(SEL)Can decline temporarily.

Therefore, after ignition switch 123 conducting, stop and the voltage V of enough first supply leads 125 in flutter_B1After the time being stabilized to cell voltage VB passes, timer 165 exports to drive to Control circuit 136 and allows signal Sd. Control circuit 136 allows the input of signal Sd to carry out conducting MOSFET137(moment t43 in response to driving). Selection circuit 163 selects first supply lead 125 with maximum voltage from supply lead 125,126 and 127. That is, diode 163a is energized, and supplies the cell voltage VB of battery 5 by ignition switch 123 and diode 163a to supply lead 164.

When the coil 124b of main relay 124 is energized, normally opened contact 124a is closed after the operating time of rly. and the 2nd supply lead 126 is supplied cell voltage VB(moment t44). Primary source circuit 138 and sub-power source circuit 43 have been transfused to the voltage V of the 2nd supply lead 126_B2And generate main power voltage V respectively_OMWith sub-voltage of supply Vos. Microcomputer 133 starts operation and memory data is performed initialization process by main processing unit 134, as shown in figure 14. Selection circuit 163 selects the first supply lead 125 or the 2nd supply lead 126, and by the voltage V of supply lead 164_B(SEL)Remain on cell voltage VB place.

When ignition switch 123 is when moment t45, place disconnected, it is interrupted to the power supply of the first supply lead 125. But, when from microcomputer 133 input power holding signal Sh, Control circuit 136 keeps conducting MOSFET137 with the use of the voltage of the power supply holding signal Sh as voltage of supply. This period (moment t45 to t46) period, selection circuit 163 select the 2nd supply lead 126 and by the voltage V of supply lead 164_B(SEL)Remain on cell voltage VB place.

When microcomputer 133 is hereafter when moment t46, place stopped out-put supply holding signal Sh, Control circuit 136 disconnects MOSFET137. When the energising of the coil 124b of main relay 124 stops, the voltage V of the 3rd supply lead 127_B3Again substantially rise to cell voltage VB. Meanwhile, when after stopping in the energising of coil 124b, the time of recovery of rly. 124 passes, normally opened contact 124a is in open circuit and is interrupted to the power supply of the 2nd supply lead 126. Therefore, primary source circuit 138 and sub-power source circuit 143 stopping operation.

The electrical condenser 162 being connected between the 2nd supply lead 126 and ground keeps the operation that the voltage of the 2nd supply lead 126 enough keeps battery status signal Sb for latch cicuit 150. During above-mentioned switching, this process is performed, until the voltage V of the 3rd supply lead 127_B3Become the voltage of enough operations keeping battery status signal Sb for latch cicuit 150. At moment t47, selection circuit 163 selects the 3rd supply lead 127 to replace the 2nd supply lead 126, and by the voltage V of supply lead 164_B(SEL)Remain on cell voltage VB place.

As mentioned above, it is necessary, as long as battery 5 does not disconnect, supply lead 164 is just continuously fed with cell voltage VB. Therefore, latch cicuit 150 continues to export low level battery status signal Sb. When ignition switch 123 during this period again conducting time, do not perform the initialization process to flash memory 135, because the battery status signal Sb inputted is in lower level. When battery 5 is hereafter when moment t48, place was disconnected connection, it is interrupted to the power supply of all supply leads 125,126 and 127, thus the voltage V of supply lead 164_B(SEL)Also 0V is turned into. As a result, ECU21(comprises latch cicuit 150) stopping operation. But, the data in flash memory 135 are maintained.

Also according to the 6th embodiment, as mentioned above, it is necessary, the initialize of the detection disconnected about battery and flash memory 135, it provides the operation identical with the 5th embodiment and effect. As long as the offer of selection circuit 163 makes battery 5 be connected the voltage V then corresponding to cell voltage VB_B(SEL)Just can being continuously fed with to supply lead 164, wherein selection circuit 163 has been transfused to the voltage V of the first supply lead 125_B1, the 2nd supply lead 126 voltage V_B2With the voltage V of the 3rd supply lead 127_B3And from them, select maximum voltage. This makes the dedicated wires for lasting power supply not needing to connect battery 5 and ECU21, and can reduce costs and strengthen reliability.

When ignition switch 123 conducting, Control circuit 136 allows signal Sd to wait the voltage V making at least the first supply lead 125 based on the driving from timer 165_B1One end time being stabilized to cell voltage VB, and conducting main relay 124 afterwards. As a result, even if there is flutter, the voltage V of the 3rd supply lead 127 at the contact place of ignition switch 125_B3Still the voltage V of supply lead 164 can be supplied as when there is this flutter_B(SEL)Such that it is able to realize the stable power supply continued. Owing to the electrical condenser 162 of the volts lost for postponing in the 2nd supply lead 126 is provided between the 2nd supply lead 126 and ground, it is possible to avoid the voltage V of supply lead 164_B(SEL)Decline and the stable power supply continued can be realized, even if set up when main relay 124 is disconnected transient behaviour.

(the 7th embodiment)

7th embodiment is as shown in Figure 17 and Figure 18. Such as, in the 7th embodiment, as shown in figure 17, it does not have the 6th embodiment as shown in figure 15 connects the dedicated wires (supply lead 128 shown in Figure 11) of ECU21 and battery 5 like that with being provided for continuing. Power supply IC132 in 7th embodiment is different from the power supply IC132 shown in Figure 15 because the configuration of selection circuit 163 is different and electrical condenser 173 is added between supply lead 164 and ground.

Selection circuit 163(selection circuit) use supply lead 126 and 127 as input, and from selecting the supply lead with more high-voltage among them. Afterwards, its to supply lead 164(continue supply lead) export selected by voltage V_B(SEL)Especially, (voltage that the forward voltage Vf of diode 163b and 163c reduces). As the voltage V of the first supply lead 125_B1During rising, Control circuit 136 conducting MOSFET137 thus conducting main relay 124.

7th embodiment operates as shown in Figure 18. Similar with Figure 16, Figure 18 shows the connection state of battery 5 and the voltage V of the first supply lead 125_B1, the 3rd supply lead 127 voltage V_B3With the voltage V of the 2nd supply lead 126_B2Waveform. When battery 5 is when moment t51, place was connected to ECU21, selection circuit 163 selects the supply lead 127 with more high-voltage from supply lead 126 and 127. That is, supply cell voltage VB from battery 5 to supply lead 164 by coil 124b and the diode 131 being arranged in supply lead 127 and 172c. Now, the electrical condenser 173 cell voltage VB being connected to supply lead 164 charges.

Meanwhile occur, it has been transfused to the voltage V of supply lead 164_B(SEL)Simple power source circuit 147 and 149 start operation, and latch cicuit 150 and power-on reset circuit 151 utilize simple voltage of supply V_p2And become to operate. Now, power-on reset circuit 151 exports low level reset signal Sr. As a result, latch cicuit 150 is reset and exports battery status signal Sb(first state of high level) carry out pilot cell 5 and disconnect.

When ignition switch 123 is when the place's conducting of moment t52, the first supply lead 125 is connected to battery 5 by ignition switch 123. In response to the voltage V of the first supply lead 125_B1Rising, Control circuit 136 conducting MOSFET137(moment t53). As a result, the voltage V of the 3rd supply lead 127_B3Substantially 0V is dropped to, and the coil 124b of main relay 124 is energized. Normally opened contact 124a is closed by this energising, and cell voltage VB was supplied to for the 2nd supply lead 126(moment t54). After moment t54, selection circuit 163 selects the 2nd supply lead 126.

At the voltage V of the 3rd supply lead 127_B3After moment t53, place dropped to 0V substantially, from moment t54 to the voltage V of the 2nd supply lead 126_B2During being stabilized to the period of cell voltage VB, the voltage of supply supplied from supply lead 126 and 127 is temporarily interrupted. The voltage V of the 2nd supply lead 126 it is being conducting to from main relay 124_B2Become enough for by latch cicuit 150 to during the period keeping the voltage of the operation of battery status signal Sb, the voltage that electrical condenser 173 keeps supply lead 164 enough for by latch cicuit 150 to keep the operation of battery status signal Sb.

When ignition switch 123 the moment t55 place disconnect and microcomputer 133 the moment t56 place stopping out-put supply holding signal Sh time, Control circuit 136 disconnects MOSFTE137. When the energising of the coil 124b of main relay 124 is stopped, the voltage V of the 3rd supply lead 127_B3Again substantially rise to cell voltage VB. Meanwhile, when after being stopped in the energising of coil 124b, the time of recovery of rly. 124 passes, normally opened contact 124a is in open circuit and is interrupted to the power supply of the 2nd supply lead 126.

When this switching, electrical condenser 162 is at the power supply V of the 3rd supply lead 127_B3Fully rise the voltage V as supply lead 164_B(SEL)Avoid the voltage V of the 2nd supply lead 126 before_B2Decline. Even if the voltage V of the 2nd supply lead 126_B2At the voltage V of the 3rd supply lead 127_B3Decline before fully rising, electrical condenser 173 still can avoid the voltage V of supply lead 164_B(SEL)Decline. After moment t57, selection circuit 163 select the 3rd supply lead 127 and by the voltage V of supply lead 164_B(SEL)Remain on cell voltage VB place.

As mentioned above, it is necessary, as long as battery 5 does not disconnect, supply lead 164 is just continuously fed with cell voltage VB. Therefore, latch cicuit 150 continues to export low level battery status signal Sb. When ignition switch 123 during this period again conducting time, do not perform the initialization process to flash memory 135, because the battery status signal Sb inputted is in lower level. After battery 5 when moment t58, place was disconnected connection, it is interrupted to the power supply of supply lead 126 and 127, thus the voltage V of supply lead 164_B(SEL)Also little by little fall for 0V.

Also according to the 7th embodiment, as mentioned above, it is necessary, the initialize of the detection disconnected about battery and flash memory 135, it provides the operation identical with the 5th embodiment and effect. When the relay operation time (namely from the energising of the coil 124b of main relay 124 to normally opened contact 124a closed) very in short-term, as long as battery 5 is connected, voltage V_B2Or V_B3In any voltage be just maintained at cell voltage VB or the voltage place close to VB.

Therefore, if the offer of selection circuit 163 make battery 5 be connected just can to supply lead 164 lasting supply cell voltage VB or the voltage close to VB, wherein selection circuit 163 has been transfused to the voltage V of the 2nd supply lead 126_B2With the voltage V of the 3rd supply lead 127_B3And select higher voltage. This makes the dedicated wires for lasting power supply not needing to connect battery 5 and ECU21, and can reduce costs and strengthen reliability.

Be provided in due to electrical condenser 173 between supply lead 164 and ground, thus be conducting to from main relay 124 that latch cicuit 150 becomes can by during keeping the period till battery status signal Sb from the power supply of the 2nd supply lead 126, the voltage V of supply lead 164_B(SEL)Can be maintained at enough for keeping the voltage place of the operation of battery status signal Sb. This makes it possible to be avoided the voltage V of supply lead 164 when ignition switch 123 conducting_B(SEL)Decline. And, when main relay 124 disconnects, the voltage V of supply lead 164 avoided by electrical condenser 173_B(SEL)Decline. Therefore, in the 7th embodiment providing electrical condenser 173, electrical condenser 162 is also can elliptical.

(the 8th embodiment)

As shown in figure 19, the battery that it illustrates in the power supply IC being provided in ECU21 disconnects detection circuit to 8th embodiment. 8th embodiment is different from each embodiment in the 5th to the 7th embodiment, because write control circuit 181 is provided as battery state retaining circuit to replace latch cicuit 150 by it. In Figure 19, supply lead 128 can be replaced with supply lead 164.

Write control circuit 81 is including as the flash memory 182 of non-volatile memory, and adopts the simple voltage of supply V generated by simple power source circuit 149_p2Operate. Flash memory 182 storage battery status signal Sb, in order to whether pilot cell 5 before ignition switch 123 conducting disconnects with ECU21. Write control circuit 81 is similar with the function of latch cicuit 150 described above.

When battery 5 is connected to ECU21, write control circuit 181 performs the battery status signal Sb in flash memory 182 is rewritten as 1(first state according to the low level reset signal Sr exported from power-on reset circuit 151), and perform the battery status signal Sb of high level is exported to microcomputer 133. Meanwhile, when asserts signal Ss inputs from microcomputer 133, battery status signal Ss is rewritten as 0(two-state by it), and export low level battery status signal Sb to microcomputer 133. Also according to the 8th embodiment, it provides the operation identical with each embodiment in embodiment described above and effect.

(the 9th embodiment)

9th embodiment is as shown in Figure 20 and Figure 22. 9th embodiment relates to the abnormality detection when battery disconnects detection. As mentioned above, it is necessary, flash memory 135 stores in the laws and rules about OBD the data required, such as about the data (abnormality) of engine about the historical data of execution of trouble diagnosis and when breaking down. Even if when not observing about the vehicle of the laws and rules of OBD, still preferably store the data helping identify fault state. Consequently, it is desirable to battery disconnects the high reliability of detection circuit, to avoid flash memory 135 by mistake ground initialize.

Such as, if fixing fault (fixationfailure) occurring in latch cicuit 150 and battery status signal Sb is remained on high level by continuing, then all flash memory 135 is performed initialization process when each ignition switch 123 conducting. Although battery 5 disconnects, also perform this initialization process. For this reason, round trip diagnosis (two-tripdiagnosis) can not be performed again. In round trip is diagnosed, being considered as a stroke from being conducting to the period disconnecting ignition switch 123, therefore trouble diagnosis result from each stroke is stored in flash memory 135. When same fault being detected in two trouble diagnosises, it finally determines that fault occurs. In addition, when above, the study control in fuel injection control etc. becomes difficulty.

On the contrary, if fixing fault occurs in latch cicuit 150 and battery status signal Sb remains on lower level lastingly, then can not detect that battery disconnects, although in fact battery 5 disconnects. When battery disconnect be detected time, such as, ECU21 detection whether be attached to antitheft fixer. For this reason, if the ECU21 not setting up antitheft fixer is stored when primary data is installed on it and is attached in the vehicle of antitheft fixer, then ECU21 can not recognize that antitheft fixer and set up, unless detected that battery disconnects.

In order to diagnose the presence or absence of fault that this kind is relevant to battery status signal Sb, the main processing unit 134 of microcomputer 133 performs the periodical diagnostic process shown in the process of the initial diagnosis shown in Figure 20 and Figure 21. Figure 22 (a) and (b) respectively illustrate the battery status signal Sb and diagnostic markers Fd that use when performing initial diagnosis process and periodical diagnostic processes. Diagnostic markers Fd is used to indicate periodical diagnostic to process ongoing mark, and is stored in the flash memory 135 of nonvolatile memory.

Main processing unit 134 periodically performs the process of the periodical diagnostic shown in Figure 21 when ignition switch 123 is in conducting state. When diagnosing beginning, battery status signal Sb is in lower level. This diagnostic process only just performs (step S21) when the operational stage of engine meets predetermined diagnosis condition. Diagnostic markers Fd is set to 1(equivalence in diagnosis state by main processing unit 134) (step S22), and reset signal Sr is exported to latch cicuit 150(step S23). Although not illustrating, but the logic of the reset signal Sr from power-on reset circuit 151 and the reset signal Sr from microcomputer 133 and (logicalsum) are transfused to, with the input/R of reseting lock storaging circuit 150.

Main processing unit 134 checks whether the battery status signal Sb inputted from latch cicuit 150 is in high level (step S24). The (YES) when this signal is in high level, it exports asserts signal Ss(step S25 to latch cicuit 150), and check whether the battery status signal Sb inputted from latch cicuit 150 is in lower level (step S26) again. When this signal is in lower level (YES), then it determines that battery disconnects detection circuit normal running. Hereafter, diagnostic markers is set to 0(equivalence in non-diagnostic state by it), and terminate this series of processes (step S27).

Meanwhile, when reset signal Sr is output but battery status signal Sb does not turn into high level (step S24: no), or when asserts signal Ss is output but battery status signal Sb does not return lower level (step S26: no), it is determined that operational anomaly. Now, the diagnostic data of instruction exception is stored in flash memory 135, and warning light is unlocked with driver abnormal (step S28). Hereafter, diagnostic markers Fd is eliminated, and is that is set to 0, and terminates this series of processes (step S27).

In the initial diagnosis shown in Figure 20 processes, when ignition switch 123 conducting, main processing unit 134 performs initial diagnosis process and the initialization process to flash memory 135, as an initialize routine. The process of this initial diagnosis only just performs when the battery status signal Sb inputted from latch cicuit 150 is in high level (step S11).

When battery status signal Sb is in high level (step S11: yes), main processing unit 134 checks whether the setting of diagnostic markers is that 1(diagnoses state) (step S12). When this setting is 0(non-diagnostic state) time, it exports asserts signal Ss(step S13 to latch cicuit 150), and check whether the battery status signal Sb inputted from latch cicuit 150 returns lower level (step S14) again. When this signal is in lower level (YES), it determines that battery disconnects detection circuit just in normal running, and the data that initialize is stored in flash memory 135 (step S15). Meanwhile, when this signal is in lower level (no), it determines that battery disconnects detection circuit and has exception, thus does not perform the initialization process to flash memory 135.

When the setting of diagnostic markers is 1(step S12: yes) time, it determines that ignition switch 123 is disconnected in periodical diagnostic treating processes described above. Therefore, even if battery status signal Sb is in high level, battery 5 still not yet disconnects. Therefore, in order to the state of initialize diagnostic markers and battery status signal Sb, diagnostic markers is set to 0(step S16 by main processing unit 134), and export asserts signal Ss(step S17 to latch cicuit 150). In this case, flash memory 135 is not initialised.

According to the 9th embodiment described above, battery status signal Sb is in high level when when ignition switch 123 conducting, before flash memory 135 is initialised, performs initial diagnosis process confirms that battery status signal Sb normally changes. This makes it possible to be avoided the output because of latch cicuit 150 to be fixed on the fault of high level and mistake ground initialize flash memory 135.

The main processing unit 134 performance period property diagnostic process of microcomputer 133 such that it is able to detection appears at battery and disconnects any fault in detection circuit before ignition switch 123 is disconnected. When detecting abnormal, diagnostic data is stored in flash memory 135, and warning light is unlocked abnormal with driver. When ignition switch 123 next conducting time, main processing unit 134 with reference to that diagnostic data so that flash memory 135 can be avoided by mistake ground initialize when fault.

In periodical diagnostic processes, microcomputer 133 exports reset signal Sr to latch cicuit 150, and impels battery status signal Sb to convert high level (battery disconnects) to temporarily. If ignition switch 123 now disconnects, then can be wrong when the following conducting of ignition switch determine that battery disconnects. In this embodiment, meanwhile, the diagnostic markers Fd in the execution of indicate periodic diagnostic process is stored in flash memory 135. When ignition switch 123 conducting, with reference to this diagnostic markers. This makes it possible to be avoided mistake ground initialize flash memory 135.

(the tenth embodiment)

Tenth embodiment as shown in figure 23, only performs once initialization process to memory data by the main processing unit 134 of microcomputer 133 when it illustrates each ignition switch 123 conducting. This initialization process also enhances the reliability of the initialization process of the 5th embodiment (Figure 14).

Main processing unit 134 is transfused to the battery status signal Sb(step S31 from power supply IC), and check whether this signal is in high level (step S32). When this signal is in high level (YES), it increases progressively counting value (that is, the non-volatile counter) C being stored in nonvolatile memory (such as, flash memory 135), and exports asserts signal Ss(step S34). This signal is in lower level (no), then skip the process of step S33 and S34. Then, main processing unit 134 checks whether this counting value C is 2(designated value) or it is greater than 2(step S35). When this counting value is two or more (YES), the data (step S36) that initialize is stored in flash memory 135, and this counting value C is reset to 0. As this counting value C, to be less than 2(no) time, not initializes memory data. Designated value is not limited to 2.

According to the tenth embodiment, it is necessary to perform twice or more the data that time following operation is stored in flash memory 135 with initialize: battery 5 is disconnected with ECU21 and is again connected the operation of also conducting ignition switch 123 afterwards. This makes it possible to reliably be avoided the mistake execution of erroneous erasure and the initialization process caused because of the mistake of worker in initialize process, and only just reliably it can be carried out initialize when its data that expectation initialize is stored in flash memory 135 really.

(the 11 embodiment)

11 embodiment is as shown in figure 24. In this simple initial method, disconnect the connection of battery 5 with ECU21 and again connect, and conducting ignition switch afterwards 123 carrys out initializes memory data. The method performs at place of service station with serving sellers usually. In this case, usually perform to check work, repairs and initial work after vehicle stops and being cooled. In initial work, igniting key is inserted in igniting key hole and key rotor is set to IGON position by worker. But, he or she also is not intended to start engine, and key rotor is not placed in START position. Therefore, do not perform the crank that startup electric motor starts.

The initialization process to memory data shown in Figure 24 considers this Working environment, thus further enhancing the reliability of the initialization process shown in Figure 24. The main processing unit 134 of microcomputer 133 detects the temperature T(step S41 of the water coolant being used for cooling engine). Afterwards, it checks whether temperature of cooling water T is positioned at Working environment temperature range (such as, between 0 DEG C and 80 DEG C, comprising 0 DEG C and 80 DEG C) (step S42). This is because in vehicle stopping and cooled operational condition, temperature of cooling water T also reaches the temperature close to Working environment. The value of Working environment temperature range is only example, and can change arbitrarily.

When determining that temperature of cooling water is positioned at Working environment temperature range (YES), calculate rotation (speed of rotation) the number N(step S43 of umber of pulse with detecting and alarm of crank angle signal). Check whether this rotation number N is zero (step S44) afterwards. This is because in the environment (engine is rotated in this context) comprising the crank described below, do not perform the initialization process to memory data.

When rotation number N is zero (YES), the pending intention (step S45) confirming worker such as execution. Waiting time can be set to be longer than when engine start, key rotor is set to IGON position and after be set to the time of estimated time needed for START position. Afterwards, check whether to exist crank (cranking) (step S46). When determining to there is not crank (no), order performs the process of the step S47 to S50 corresponding to the step S1 to S4 shown in Figure 14. When the arbitrary steps place in step S42, S44 and S48 makes no determination or makes, in step S46 place, the determination being, terminate this series of processes immediately.

According to the 11 embodiment, in the environment that Working environment can not realize, do not perform the initialization process to memory data. It is at engine and does not perform in operation or when there is crank. Accordingly, it may be possible to appropriately reflect that Working environment and worker are to the intention of initialize. Result, it is possible to reliably avoid the mistake execution of erroneous erasure and the initialization process caused because of the mistake of worker in initialize process, and only just reliably it can be carried out initialize when its data that expectation initialize is stored in flash memory 135 really. Also the mistake caused because of the decline of cell voltage can be avoided to determine by avoiding crank times.

(the 12 embodiment)

As shown in figure 25, wherein (a) is block diagram to 12 embodiment, and (b) shows the relation between vehicle-mounted ECU (comprising ATECU191 and ABSECU192). ATECU191 controls automatic transmission (AT), and ABSECU192 suppresses when braking and controls the slip of wheel. These vehicle-mounted ECU can via CAN(controller zone network) communicated with one another by bus 193, wherein CAN is one of them In-vehicle networking.

ATECU191 and ABSECU192 as other vehicle power operating devices also detects whether battery 5 before ignition switch 123 conducting disconnects, and can battery status signal Sb like output class. They can perform the process of the initial diagnosis shown in Figure 20, with the diagnostic data that to obtain their presence or absence of fault disconnected in detection circuit to battery relevant, i.e. and battery status signal Sb.

Figure 26 shows the initialization process to memory data performed by the microcomputer 133 of engine ECU21. The main processing unit 134 of microcomputer 133 has been transfused to the battery status signal Sb(step S51 of ECU21), and check whether this signal is in high level (step S52). When this signal is in high level (YES), it has been transfused to via the diagnostic data (step S53) of CAN from ATECU91 and ABSECU92. Checking afterwards and disconnect detection about battery, whether ATECU91 and ABSECU92 be just at normal running (step S54).

When they are just when normal running, input the battery status signal Sb(step S55 from ATECU91 and ABSECU92 by CAN), and check whether these battery status signals Sb is all in high level (step S56). When the conditions are satisfied, namely when the battery status signal Sb of engine ECU21, ATECU91 and ABSECU92 is in high level as indicated in the logical circuit institute equivalence in Figure 25 (b), data (step S57) that initialize is stored in flash memory 135 also export asserts signal Ss(step S58). When disconnecting existence abnormal (step S54: no) in detection circuit when the battery status signal Sb of ECU21 is in lower level (step S52: no) and when the battery of ATECU191 or ABSECU192, then terminate initialization process immediately.

According to the 12 embodiment, only disconnect simultaneously at engine ECU21 place but also at another ECU(such as at battery, ATECU91 or ABSECU92) place when being detected just execution to the initialization process of memory data. Accordingly, it may be possible to avoid mistake ground initialize flash memory 135 more reliably. Other vehicle power operating devices are not limited to ATECU91 or ABSECU92.

(modified example)

The nonvolatile memory of such as EEPROM and so on can be provided to replace flash memory 135. In the 9th embodiment, it is possible to only perform any one in the accuracy diagnostic process shown in the process of the initial diagnosis shown in Figure 20 or Figure 21. When only performing initial diagnosis and process, it is not necessary to the process of step S12, S16 and S17.

Ten, the 11 and the 12 embodiment can arbitrary combination. Such as, it is possible to every time disconnect battery 5 and ECU21 connect and again connect and after the operation of conducting ignition switch 123 be performed twice or more secondary after, when predetermined condition meets, the data being stored in flash memory 135 are carried out initialize. Predetermined condition is that temperature of cooling water should be positioned at Working environment temperature range, quantity should be zero, crank should not be performed and battery status signal Sb should be positioned at high level in rotation.

Can work as disconnect battery 5 and ECU21 connect and again connect and after the operation of conducting ignition switch 123 be performed twice or more time and when engine ECU21 and another vehicle power operating device (such as ATECU91 and ABSECU92) all detect that battery disconnects, the data being stored in flash memory 135 carried out initialize every time.

Can determine that some conditions are met at the microcomputer 133 of ECU21 and the data being stored in flash memory 135 be carried out initialize when engine ECU21 and another vehicle power operating device (such as ATECU91 and ABSECU92) all detect that battery disconnects. Above-mentioned condition is that temperature of cooling water should be positioned at Working environment temperature range, quantity should be zero, crank should not be performed and battery status signal Sb should be positioned at high level in rotation.

In the sixth embodiment, timer 165 can omit in the following cases: when ignition switch 123 conducting, owing to ignition switch 123 not having flutter or flutter cycle short, so the voltage of the first supply lead 125 is sufficiently early stablized, and the voltage V of the first supply lead 125_B1With the voltage V of the 3rd supply lead 127_B3Do not decline simultaneously.

Timer 165 also for avoid Control circuit 136 in the short cycle repeatedly conducting and disconnect MOSFET137, even when there is flutter in the contact place of ignition switch 123. Thus, it would be desirable to also provide timer 165 in the 5th, the 7th embodiment.

In the 6th and the 7th embodiment, the electrical condenser 162 maintaining circuit as voltage can occur when the energising of the coil 124b when main relay 124 stops to omit during following situation. At the voltage V of the 3rd supply lead 127_B3Fully rise the voltage V as supply lead 164_B(SEL)Afterwards, the voltage V of the 2nd supply lead 126_B2Decline.

In the 7th embodiment, when the relay operation time (namely from the energising of the coil 124b of main relay 124 to normally opened contact 124a disconnect) very in short-term, from the voltage V of the 3rd supply lead 127_B3The voltage V declining and starting to the 2nd supply lead 126_B2Time till rising is also shortened. In this case, electrical condenser 173 can omit, as long as reset signal Sr can be remained on high level place by power-on reset circuit 151 when not having electrical condenser 173.

And in the sixth embodiment, electrical condenser 173 can be provided between supply lead 164 and ground. Timer 165 and electrical condenser 162 can omit, as long as the volts lost in supply lead 164 can be avoided by providing electrical condenser 173.

Claims (10)

1. a car-mounted electronic control device (21), comprising:

First supply lead (22), it is connected to the positive terminal of battery (5) by ignition switch (2);

2nd supply lead (23), it is connected to the described positive terminal of described battery (5) by the normally opened contact (4a) of power supply rly. (4); And

3rd supply lead (24), it is connected to the described positive terminal of described battery by the coil (4b) of described power supply rly., described power supply rly. is distinguished conducting and disconnection when described ignition switch conducting and disconnection, it is characterised in that, also comprise:

Selection circuit (34), it at least uses described 2nd supply lead and described 3rd supply lead as input and selects maximum voltage from the voltage of the described supply lead being used as to input, and the maximum voltage selected by exporting; And

Power source circuit (37), its export from described selection circuit selected by maximum voltage to generate predetermined power source voltage.

2. car-mounted electronic control device according to claim 1 (21), wherein:

Described selection circuit (34) also uses described first supply lead (22) except using described 2nd supply lead and described 3rd supply lead, and selects described maximum voltage from the voltage of all supply leads being used as to input.

3. car-mounted electronic control device according to claim 2 (21), also comprise:

Delay circuit (31), it is when the voltage responsive of described first supply lead rises in the conducting of described ignition switch, after waiting until that the voltage of at least described first supply lead is stabilized to the time till the voltage of described battery, power supply rly. described in conducting.

4. car-mounted electronic control device according to claim 1 (21), also comprise:

Electrical condenser (64), it is connected between the output line (35) of described selection circuit and ground, can by during generating the period described predetermined power source voltage from the power supply of described 2nd supply lead, the output voltage of described selection circuit be maintained at enough for generating the voltage place of described predetermined power source voltage to become to described power source circuit being switched on from described power supply rly..

5., according to car-mounted electronic control device (21) described in any one claim in Claims 1-4, also comprise:

Electrical condenser (27), it is connected to the described 2nd between supply lead and ground, can by during generating the period described predetermined power source voltage from the power supply of described 3rd supply lead, the voltage of described 2nd supply lead be maintained at enough for generating the voltage place of described predetermined power source voltage to become to described power source circuit power supply rly. described after being disconnected from described ignition switch is disconnected.

6. according to car-mounted electronic control device (21) described in any one claim in Claims 1-4, wherein:

Described ignition switch (2) is configured to export square-wave voltage when conducting to described first supply lead.

7. according to car-mounted electronic control device (21) described in any one claim in Claims 1-4, wherein:

Described first supply lead (22) is connected to the terminal for received pulse voltage (21d) place, and this pulsed voltage is used for power supply rly. described in order conducting.

8. according to car-mounted electronic control device (21) described in any one claim in Claims 1-4, wherein:

Described power source circuit (37) continues ground and disconnects detection circuit (60) supply voltage to the volatile memory (10) in microcomputer (7) or battery.

9. according to car-mounted electronic control device (21) described in any one claim in Claims 1-4, wherein:

Described power source circuit (37) is connected, even if after making the power supply of the main processing unit (8) in the microcomputer of vehicle to be disconnected when described ignition switch disconnects, it is also possible to continue ground and power to the volatile memory (10) in described microcomputer (7).

10. according to car-mounted electronic control device (21) described in any one claim in Claims 1-4, wherein:

Described selection circuit (34) comprise with or gating circuit configure the diode (34a to 34c) that connects, wherein each anode is connected to the described supply lead that is used as to input.