JPS63240334A - Controller of vehicle generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for controlling a vehicle power generator driven by an engine. Concerning measures to make variable adjustments.

(Prior Art) Conventionally, as a technique for protecting a battery installed in a vehicle, techniques disclosed in, for example, Japanese Patent Laid-Open No. 58-43146 and Japanese Patent Laid-Open No. 58-63041 are known. . That is, the former (Japanese Unexamined Patent Publication No. 58-43146@publication) uses a detector to detect the state of charge of the vehicle battery, and when the state of charge of the battery detected by this detector is insufficient, the battery is removed. The amount of power generated by the generator during charging is increased, while the amount of power generated is reduced in an overcharged state.In parallel, the idling speed of the engine is reduced depending on the detection state of the detector. By controlling the increase/decrease, it is possible to eliminate undercharging and overcharging of the battery.

In addition, in the latter method (Japanese Unexamined Patent Publication No. 58-63041), the terminal voltage of the battery in a non-charging state is memorized, and this memorized value is compared with a predetermined reference value, and the memorized value is determined to be the reference value. When the engine speed is lower than normal, the regulated voltage of the generator and the idling speed of the engine are set higher than normal to prevent what is called a dead battery.

(Problem to be solved by the invention) However, in general, a battery's charging capacity, that is, its ability to accept or accept current, changes depending on the surrounding temperature (outside temperature), and the lower the outside temperature, the lower the charging capacity. Therefore, if the charging capacity of the battery is adjusted only according to the charging state of the battery or the battery terminal voltage when not charging, as in the conventional example described above, the charging capacity due to the temperature change of the battery itself cannot be adjusted. However, it is difficult to properly charge the battery to adequately cope with fluctuations in the battery.

The present invention has been made in view of the above, and its purpose is to change the amount of charge to the battery of an on-vehicle generator in accordance with temperature changes, thereby preventing the battery from overheating. The purpose is to always be able to properly charge the battery without causing charging or insufficient charging.

(Another Means to Solve the Problem) In order to achieve this object, the solution of the present invention detects the internal liquid temperature as the battery temperature, and detects the charging capacity of the battery of the generator driven by the engine. This is necessary by variably controlling the voltage according to the detected liquid temperature to supply power to the battery that compensates for fluctuations in charging capacity due to changes in ambient temperature.

Specifically, as shown in FIG. a14 and the 7fflXi
The assumption is that the vehicle is equipped with a battery 18 that is charged by a battery 14. Then, a battery temperature detecting means 19 detects a signal related to the liquid temperature B of the battery 18, and receives the output of the detecting means 19,
A control means 25 is provided for variable control such that the charging capacity for the battery 1B is increased as the liquid temperature Ts of the battery 1B is lower.

(Function) With this configuration, a signal related to the liquid temperature Ta of the battery 1B is detected by the detection means 19, and the control means 25 receiving the output of the detection means 19 determines the charging capacity of the battery 1B before power generation 14. The charging capacity is variably controlled according to the liquid temperature Te, and the charging capacity is adjusted so that the lower the liquid temperature Te is, the higher the charging capacity is. That is, the liquid temperature T of the battery 18
When e is low and the charging capacity of the battery 18 itself is reduced, the charging capacity of the generator 14 for the battery 18 is increased to compensate for the reduction in charging capacity.

On the other hand, in a state where the liquid temperature TB of the battery 18 is high and its charging capacity is increasing, the charging capacity of the generator 14 side is suppressed. Therefore, since the charging capacity of the generator 14 changes in response to the change in the charging capacity of the battery 18 itself, the battery 18 can always be stably and appropriately charged without causing overcharging or undercharging.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows the overall configuration of an embodiment of the present invention, in which 1 is a fuel injection type engine mounted on an automobile, and 2 is an intake passage for supplying intake air from an air cleaner 3 to the combustion chamber 1a of the engine 1. A throttle valve 4 for opening and closing the intake passage 2 is disposed in the middle of the intake passage 2. Also,
A bypass passage 5 that bypasses the throttle valve 4 is branched and connected to the intake passage 2, and an idle rotation control valve 6 for adjusting the opening degree of the passage 5 is disposed in the bypass passage 5. By variably controlling the passage area of the bypass passage 5 using the idle rotation control valve 6, the idle rotation speed of the engine 1 is adjusted.

7 is an air flow meter that measures the amount of intake air.

The idle rotation control valve 6 is a controller 1 with a built-in CPU.
The operation is controlled by rollers 10. The controller 10 receives an output signal from a throttle sensor 11 that detects the opening degree of the throttle valve 4, that is, the throttle rotation angle θ;
Ignition coil 1 that constitutes the ignition system of engine 1
Pulse corresponding to the engine speed output from 2 (3
and a transmission (not shown) drive-coupled to engine 1.
An ON-OFF signal is input to the neutral switch 13, which is turned ON when the transmission gear position of the transmission gear is in the neutral position.

On the other hand, 14 is an alternator as a generator driven by the engine 1, and the alternator 14 has an excitation coil 15a (feed coil) of the excitation circuit 15.
A voltage regulator 16 is built-in to control the excitation current (feed current) flowing through the motor. This voltage regulator 16 includes an output transistor Tr+ connected in series to the excitation circuit 15, and a drive transistor Tr for ON-OFF control of the output transistor Tr+.
2, and a comparator 17 that turns the drive transistor Tr 2 ON/OFF, and the positive terminal of the vehicle battery 18 is connected to the negative input terminal of the comparator 17, and the terminal voltage Va is applied thereto. On the other hand, the adjustment voltage VR output from the controller 10 is connected to the positive input terminal.
(reference voltage) is being applied, and when the terminal voltage VB of the battery 18 is lower than the adjustment voltage VR from the controller 10, the Hi level signal from the comparator 17 turns on both transistors Tl' + and Tr2. When activated, the excitation current vii of the excitation circuit 15 increases by 1 son, and when the terminal voltage VBffi of the battery 18 becomes higher than the adjustment voltage VR, the output signal from the comparator 17 is set to Lo relay, and both transistors Tr+ , Tr2 are turned off to reduce the excitation current of the excitation circuit 15.

Further, 19 is a temperature sensor serving as a battery liquid temperature detection means for detecting a signal related to the liquid temperature TB of the battery 18, and the output signal of this temperature sensor 19 is the terminal voltage V's signal of the battery 1B. , and an ON-OFF signal S indicating whether or not the excitation circuit 15 of the alternator 14 is in an excitation state are input to the controller 10. In addition, 20 is an ignition key switch connected to the battery 18 via a fuse 21, and 22 is a check relay that connects the ignition key switch 20 and the excitation circuit 15 of the alternator 14. When this relay 22 is turned ON, charging is indicated. charge lamp 23 is lit. 24
is an on-vehicle electrical component serving as an electrical load that is energized when the ignition key switch 20 is turned on.

Here, the procedure of signal processing performed in the controller 10 will be explained with reference to FIGS. 3 and 4.

FIG. 3 shows the main routine. First, in the first step S1 after the start, the liquid temperature Te of the battery 18 detected by the temperature sensor 19 is read, and in the next step S2, the read liquid temperature TB is Calculate the regulated voltage VR for the alternator 14 corresponding to . This calculation is performed based on a table set in advance such that the lower the battery liquid temperature Ts, the higher the adjustment voltage VR, as shown in FIG. Thereafter, the process proceeds to step S3, where a voltage corresponding to the above-mentioned adjustment voltage VR is applied to the comparator 17 in the voltage regulator 16 in the alternator turbo 4, and then, in step S4, the neutral switch 13 indicating the gear state of the transmission is applied. ON/OFF signal n
s and the throttle opening degree θ detected by the throttle sensor ( ) 11. Roughly speaking, in step S5, it is determined whether the read gear position of the transmission is in the neutral position and the throttle opening θ is in the closed state, in other words, whether the engine 1 is in the idle region. However, if it is determined that it is in the non-idle region, it remains as is, and if it is determined that it is in the idle region, it moves to the idle rotation control subroutine of step S6, and then
Each returns to the first step S1.

The above-mentioned idle rotation control rib routine is performed according to the procedure shown in FIG. Zunawara, first step 31G
Excitation signal S of excitation circuit 15 of alternator 14 at
w is read, and in the next step S11, the excitation signal Sw
The conduction rate Fs of the excitation circuit 15 to the excitation coil 15a is calculated based on . After that, in step 312, it is determined whether the conductivity Fs is 100%, and here Fs=
If the determination is 100% YES, the process proceeds to step 513, where the control target voltage V for the battery 18 when the engine 1 is idling is set to V=VQ, and then the process proceeds to step S15.
Proceed to. As shown in FIG. 6, this target voltage v□ is set in advance so that it increases as the liquid temperature TB of the battery 18 decreases. On the other hand, if Fs≠100% (No), the process proceeds to step S14, where the control target voltage (■) during idling is set by the deviation δ(
After setting the value V=VR−δ by subtracting the margin), the process proceeds to step S+s. In this step S+s, the ignition signal ■9 from the ignition coil 12 and the battery 1
In the next step S16, the engine speed N is read based on the ignition signal MIa.
e@i issue. Roughly speaking, the process proceeds to step 317 to determine that the engine speed Ne is within the allowable range of the idle speed, that is, assuming that the upper and lower limits of the allowable range are r)ti and r)L, respectively, the engine speed Ne is within the allowable range of the idle speed. n
It is determined whether l-≦Ne≦nH. When it is determined that nl≦Ne≦nH, the process proceeds to step S+a, and it is determined whether the target voltage at idle set in step 5131314 is equal to the terminal voltage VB of the battery 18 detected in step S+s. A determination is made, and when this determination is Ve=V, the control is terminated. When Va<V, the process proceeds to step Sea, where it is determined whether the engine speed No. is equal to the upper limit value nH of the allowable idle speed range. When No, a command signal is sent to the idle rotation control valve 6 to increase its speed in order to increase the amount of bypass air flowing through the bypass passage 5 in order to increase the engine speed NO in step 32+. After outputting , each control ends. In other words, in step 313, the target voltage v□ is set to J: which increases as the appropriate temperature Ta of the battery 18 decreases as shown in FIG. As long as the engine speed is within the allowable range, the lower the battery liquid temperature T8, the more the flow passes through steps S18 and S19. It is made to rise. On the other hand, when the determination in step S+g is Vs>v, the process proceeds to step 320, where it is determined whether the engine speed Ne is equal to the lower limit value nl of the allowable range of the idle speed, and YES of Ne=r11- is determined. Just like that,
When NO≠nl, in step 522, a command signal is output to the idle rotation control valve 6 to reduce its opening degree in order to reduce the engine speed Ne, and then the respective controls are ended.

Further, when it is determined in step S17 that the engine speed Ne is lower than the lower limit value nl of the idle speed, and Ne<nL, the process proceeds to step S21, and then
End control. Conversely, if the engine speed Ne is higher than the upper limit of the idle speed n)-1 and it is determined that No>rlH, the process proceeds to step S22, and then
End control.

Therefore, in this embodiment, step 8 in the above flow
1 to S3 and Sea to 322 receive the output of the temperature sensor 19 that detects the liquid temperature T8 of the battery 18, and calculate the adjustment voltage VR as the charging capacity of the alternator 14 for the battery 18 and the idle rotation speed of the engine 1 to the battery 18. A control means 25 is configured to perform variable control such that the lower the liquid temperature TB, the higher the liquid temperature TB.

Therefore, in the above embodiment, the liquid temperature Te of the battery 18 is detected by the temperature sensor 19, and the controller 1 to the roller 10 that receive the output signal from the temperature sensor 19 adjust the adjustment voltage VRd'3 and the idle temperature of the engine 1. The rotation speed, that is, the charging capacity of the alternator 14 for the battery 18 is variable controlled 8, and the lower the liquid temperature TB of the battery 18 is, the higher the adjustment voltage VR and the idle rotation speed of the engine 1 are, increasing the charging capacity for the battery 18. do. However, when the charging capacity of the battery 18 fluctuates, the amount of power generated by the alternator 14 changes to compensate for the fluctuation, so that the battery 18 is always kept at an appropriate level without overcharging or undercharging. can be charged to.

In the above embodiment, as a means for changing the charging capacity of the battery 18, the adjustment voltage VR to the alternator 14 is used.
Although the idle speed of the engine 1 is changed, it is also possible to change the excitation current (feed current) flowing through the excitation circuit 15 of the alternator 14.

In addition, when a car is left parked for a long period of time, a small amount of so-called dark current flows through various electrical components such as the memory of the control device and the clock, which are powered directly from the battery without going through the ignition key switch. , the battery gradually discharges, making it difficult to restart the engine.

In order to prevent this, in addition to the configuration of the above embodiment, a cutoff means such as a relay that cuts off the power supply to the electrical components of the battery and a detection means that detects the terminal voltage of the battery are provided. sequentially detects the battery terminal voltage,
When the detected battery terminal voltage drops to a predetermined reference value, the cutoff means cuts off the power to the battery's electrical components to cut dark current, thereby preventing the voltage from falling below the battery's reference voltage. It may also be possible to prevent discharge and ensure battery capacity when restarting the engine.

In addition, in this case, if the reference value for cutting the dark current flowing from the battery to the electrical components is changed according to the battery liquid temperature, the starting limit of the battery for the engine, which changes depending on the season or region, can be adjusted. Can be corrected automatically.

(Effects of the Invention) As explained above, according to the present invention, a signal related to the liquid temperature of the vehicle battery is detected, and the charging capacity of the generator for the battery is variably controlled according to the liquid temperature. This makes it possible to supply power to the battery that corresponds to changes in charging capacity due to changes in ambient temperature, so that the battery can always be properly charged without causing overcharging or undercharging.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of the present invention. Figure 2 and the following drawings show embodiments of the present invention, and Figure 2 is an overall configuration diagram thereof;
Fig. 3 is a flowchart showing the main routine of the processing procedure processed by the controller, Fig. 4 is a flowchart showing the subroutine for controlling the idle rotation speed in the main routine, and Fig. 5 is a flowchart showing the subroutine for controlling the idle rotation speed in the main routine. FIG. 6 is a characteristic diagram used to calculate the regulated voltage of the alternator, and FIG. 6 is a characteristic diagram used to calculate the control target voltage when the engine is idling from the battery liquid temperature. 1... Engine, 6... Idle rotation control valve, 10
...Controller 1-Roller, 14...Alternator, 15
...excitation circuit, 16...voltage regulator,
18...Battery, 19...Temperature sensor, 25...
- Control means.

Claims (1)

[Claims] (1) In a vehicle equipped with a generator driven by an engine and a battery charged by the generator, a battery temperature detection means for detecting a signal related to the liquid temperature of the battery, and an output of the detection means and control means for variably controlling the battery charging capacity of the generator so as to increase as the liquid temperature of the battery decreases.