JP2010144653A - Electronic control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly restart an engine even when abnormality occurs in an idle stop function. <P>SOLUTION: In an idle stop control system 1, when an IG relay 15 is turned on, and a start/stop switch 3 is pressed, a start control microcomputer 35 starts the engine 2 using a starter relay drive circuit 32. Further, when an idle stop control microcomputer 36 stops the engine 2 when an idle stop is allowed, and when an idle stop recovery condition is satisfied, the idle stop control microcomputer 36 starts the engine 2 using a starter relay drive circuit 34. The idle stop control system 1 executes detection of abnormality of the idle stop control microcomputer 36 and the starter relay drive circuit 34 within a period from when the idle stop control microcomputer 36 stops the engine 2 until the engine 2 is started. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic control device for a vehicle having an idle stop function.

  In recent years, for the purpose of reducing fuel consumption and exhaust gas, the engine is automatically stopped when the vehicle stops and the engine does not need to be driven (for example, waiting for a signal), and then the driver resumes running. Automobiles equipped with an idle stop function that automatically restarts the engine when an operation intended is performed have been put into practical use.

Among electronic control devices having such an idle stop function, one that detects an abnormality in a starter drive circuit that drives a starter for restarting the engine before the engine is automatically stopped is known (for example, , See Patent Document 1). As a result, the engine can be automatically stopped only when the starter drive circuit is normal, and the engine can be reliably restarted after the engine is automatically stopped.
JP 2006-322332 A

  However, in the technique described in Patent Document 1, when the starter drive circuit becomes abnormal after the engine is automatically stopped, the engine cannot be restarted by the idle stop function.

  For this reason, the driver of the vehicle needs to perform a normal engine starting operation, that is, an operation of switching the shift lever from D (drive) to N (neutral) or P (parking) and a subsequent key operation. However, if the driver of the stopped vehicle notices that the engine will not restart when he tries to start the vehicle, he will panic that he will have to perform a normal engine start operation as soon as possible. A situation is assumed. As a result, the driver may not be able to smoothly perform a normal engine starting operation.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a technique capable of smoothly restarting the engine even when an abnormality occurs in the idle stop function.

  In the electronic control device according to claim 1, which is made to achieve the above object, first, the engine starting means indicates in advance that an engine starting operation performed by a user of the vehicle to start the engine has been executed. When the set engine start condition is satisfied, the engine is started. The idle stop control means stops the engine when a preset engine stop condition is satisfied, and starts the engine when a preset engine return condition is satisfied after the engine is stopped.

  Then, the first abnormality determination means determines whether or not an idle stop start abnormality, which is an abnormality in which the engine cannot be started by the idle stop control means, after the engine is stopped by the idle stop control means. This is executed within a period until the engine is started by the idle stop control means.

  According to the electronic control device configured as described above, the period from when the engine is stopped by the idle stop control unit to when the engine is started by the idle stop control unit (hereinafter also referred to as an idle stop period). In addition, when an abnormality that makes it impossible to start the engine by the idle stop control means (idle stop start abnormality) occurs, the occurrence of this idle stop start abnormality can be detected.

  That is, the electronic control device according to claim 1 can recognize the occurrence of the idle stop start abnormality before the driver of the stopped vehicle tries to start the vehicle. As a result, it is possible to take measures before the vehicle starts so that the driver of the vehicle that has stopped notices that the engine will not restart for the first time when trying to start the vehicle. . For this reason, even when an idle stop start abnormality occurs, the engine can be restarted smoothly.

  For example, in the electronic control device according to claim 1, when the first abnormality determination unit determines that an idle stop start abnormality has occurred, the engine start unit at the time of first abnormality determines the engine as described in claim 2. May be started.

  According to the electronic control device configured as described above, the engine is automatically restarted when the idle stop start abnormality occurs, so that it is not necessary for the vehicle driver to perform the engine start operation when the idle stop start abnormality occurs. Therefore, the engine can be smoothly restarted when the idle stop start is abnormal.

  Further, in the electronic control device according to claim 2, as described in claim 3, the function as the idle stop control means is realized by using the first microcomputer included in the electronic control device, and the first abnormality is detected. The function as the time engine starting means is realized by using a second microcomputer provided in the electronic control unit, and the first microcomputer and the second microcomputer are each supplied with power from separate power sources. Good. The relay drive circuit controlled by the first microcomputer and the relay drive circuit controlled by the second microcomputer may be supplied with power from separate power sources.

  According to the electronic control device configured as described above, the engine is stopped by the idle stop control means as compared with the case where the first microcomputer and the second microcomputer are supplied with power from the same power source. Generation | occurrence | production of the condition where it becomes impossible to restart an engine later can be suppressed.

  This is because when the first microcomputer and the second microcomputer are supplied with power from the same power source, if an abnormality occurs in the same power source, the idle stop control means and the first abnormality engine start means If both the first and second microcomputers are supplied with power from different power sources, the idle stop control means is used as long as the two power sources do not become abnormal at the same time. This is because both the engine start means at the time of the first abnormality and the engine start means do not function simultaneously.

  Further, in the electronic control device according to any one of claims 1 to 3, as described in claim 4, the first notification means determines that the first abnormality determination means determines that an idle stop start abnormality has occurred. Then, you may make it alert | report that the idle stop starting abnormality generate | occur | produced.

  According to the electronic control device configured as described above, before the driver of the stopped vehicle tries to start the vehicle, the driver can recognize that the idle stop start abnormality has occurred. it can. Thus, it is possible to prevent the driver of the stopped vehicle from being panicked when he / she notices that the engine does not restart for the first time when he / she tries to start the vehicle. For this reason, even when an idle stop start abnormality occurs, the engine can be restarted smoothly.

  Further, in the electronic control device according to any one of claims 1 to 4, as described in claim 5, the IG-off means determines that the first abnormality determination means determines that an idle stop start abnormality has occurred. The vehicle ignition switch may be turned off.

  According to the electronic control device configured as described above, when the ignition switch of the vehicle is turned off during the idle stop period, the vehicle driver is operated to turn on the ignition switch of the vehicle and further start the engine. This can be encouraged within the idle stop period. Thus, it is possible to prevent the driver of the stopped vehicle from being panicked when he / she notices that the engine does not restart for the first time when he / she tries to start the vehicle. For this reason, even when an idle stop start abnormality occurs, the engine can be restarted smoothly.

  Further, in the electronic control device according to any one of claims 1 to 5, as described in claim 6, the engine start prohibiting means is configured such that the shift lever of the vehicle is N (neutral) and P (parking). When the engine is prohibited from starting, the engine start means prohibits the engine from being started, and when the first abnormality determination means determines that the idle stop start abnormality has occurred, the engine start prohibition means The operation may be prohibited.

  According to the electronic control device configured as described above, when the idle stop start abnormality does not occur, the engine cannot be started if the shift lever of the vehicle is located at a position other than the N and P positions. On the other hand, when the idle stop start abnormality has occurred, the engine can be started even when the shift lever of the vehicle is located at a position other than the N and P positions.

  As a result, the driver of the stopped vehicle notices that the engine will not restart for the first time when the vehicle is about to start, and the engine is not moved to the N or P position. The engine can be started even when the engine is started such as by operating a start switch. For this reason, even when an idle stop start abnormality occurs, the engine can be restarted smoothly.

  Further, in the electronic control device according to claim 6, as described in claim 7, the engine starting means, the idle stop control means, and the engine start prohibiting means may be mounted on separate electronic control devices. Good.

  According to the electronic control device configured in this way, each of the engine starting means, the idle stop control means, and the engine start prohibiting means can be supplied with power from different power sources. Therefore, compared with the case where the engine starting means, the idle stop control means, and the engine start prohibiting means are supplied with power from the same power source, the engine starting means, the idle stop control means, and the engine start prohibiting means It is possible to suppress the occurrence of a situation where all do not function simultaneously.

  This is because when the engine starting means, the idle stop control means, and the engine start prohibiting means are supplied with power from the same power source, if the same power source is abnormal, the engine starting means, idle stop control means , And all of the engine start prohibiting means do not function at the same time, but when the engine start means, the idle stop control means, and the engine start prohibiting means are supplied with power from different power sources, three power supplies This is because the engine starting means, the idle stop control means, and the engine start prohibiting means do not all function at the same time as long as they do not become abnormal at the same time.

  Further, in the electronic control device according to any one of claims 1 to 7, when the function as the idle stop control means is realized by using a microcomputer included in the electronic control device, As described in FIG. 8, the idle stop start abnormality may be a microcomputer abnormality.

  Further, in the electronic control device according to any one of claims 1 to 8, when the idle stop control means includes a starter drive circuit for driving a starter for starting the engine, the idle stop start is performed. The abnormality may be an abnormality of the starter drive circuit as described in claim 9, or the starter drive circuit and the starter for driving the starter by the starter drive circuit as described in claim 10. The drive line may be disconnected, or the power supply line for supplying power to the starter drive circuit may be disconnected as described in claim 11.

  The electronic control unit according to claim 12 executes an idling stop process for stopping the engine when a preset engine stop condition indicating that the engine is idling is satisfied, and further includes an idling stop process. When a preset engine return condition is satisfied after the engine is stopped, an engine return process for starting the engine is executed. Then, after the engine is stopped by the idling stop process, the second abnormality determination means determines whether or not an idle stop start abnormality that is an abnormality that makes it impossible to start the engine by the engine return process. It is executed within a period until the engine is started by the engine return process.

  The electronic control device configured as described above is a device that constitutes the electronic control device according to claim 1, and can obtain the same effect as the electronic control device according to claim 1.

  Further, in the electronic control device according to claim 12, as described in claim 13, when the second annunciation means determines that the idle stop start abnormality has occurred, the idle stop start abnormality is detected. You may make it alert | report that it generate | occur | produced.

  The electronic control device configured as described above is a device that constitutes the electronic control device according to claim 4, and can obtain the same effect as the electronic control device according to claim 4.

  Further, in the electronic control device according to claim 12 or 13, when the starter drive circuit for driving the starter for starting the engine is provided, the idling stop start abnormality is described in claim 14. Thus, the starter drive circuit may be abnormal, or the drive line connected between the starter drive circuit and the starter so that the starter drive circuit drives the starter as described in claim 15. Or a disconnection of a power supply line for supplying power to the starter drive circuit as described in claim 16.

  Furthermore, in the electronic control device according to any one of claims 12 to 16, as described in claim 17, the function as the idling stop process uses a third microcomputer provided in the electronic control device. The function as the engine recovery process is realized by using a fourth microcomputer included in the electronic control unit, and the third microcomputer and the fourth microcomputer are supplied with power from separate power sources. It may be.

  According to the electronic control device configured as described above, the engine is stopped by the idling stop process as compared with the case where the third microcomputer and the fourth microcomputer are supplied with power from the same power source. The occurrence of a situation in which the engine cannot be restarted later by the engine return process can be suppressed.

  This is because when the third microcomputer and the fourth microcomputer are supplied with power from the same power source, both the idling stop process and the engine return process are performed simultaneously when an abnormality occurs in the same power source. When the third microcomputer and the fourth microcomputer are supplied with power from different power supplies, the idling stop process and the engine return process are performed unless the two power supplies become abnormal at the same time. This is because both of them will not fail simultaneously.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an idle stop control system 1 of the present embodiment.

  The idle stop control system 1 is mounted on a vehicle and, as shown in FIG. 1, is provided on an engine ECU 11 that controls the operation of the engine 2 of the vehicle and an instrument panel (not shown), and displays various states of the vehicle. A meter ECU 12 that controls a display unit (not shown), an idle stop ECU 13 that controls start and automatic stop of the engine 2, a starter 14 that starts the engine 2, and a DC power supply VB1 that is energized when turned on. Provided with an IG relay 15 for supplying a power supply voltage from the power source and an indicator 16 provided on an instrument panel (not shown) for notifying abnormality of the idle stop function.

  Among these, the idle stop ECU 13 includes an IG relay drive circuit 31 that outputs a drive signal for turning on the IG relay 15 and a starter relay that outputs a drive signal for turning on a starter relay 42 (described later). A drive circuit 32, a neutral switch drive circuit 33 for outputting an on / off instruction signal for instructing on / off of a neutral switch 41 (described later), and a drive signal for turning on a starter relay 42 (described later) are output. A starter relay drive circuit 34, an IG relay drive circuit 31, a starter relay drive circuit 32, a neutral switch drive circuit 33, and an idle stop control microcomputer 36 that controls the starter relay drive circuit 34. .

  The starter relay drive circuit 34 detects whether an overheat, overcurrent, or open failure has occurred in the starter relay drive circuit 34. If any of these is detected, the starter relay indicating that fact is detected. A relay abnormality detection signal is output to the idle stop control microcomputer 36.

  The start control microcomputer 35 and the idle stop control microcomputer 36 are well-known microcomputers including a CPU, a ROM, a RAM, an I / O, a bus line for connecting these components, and the like. Various processes are executed based on this. The start control microcomputer 35 and the idle stop control microcomputer 36 are communicably connected to the engine ECU 11 and the meter ECU 12 via an in-vehicle LAN (not shown). Further, the start control microcomputer 35 and the idle stop control microcomputer 36 are connected via a signal line LS so that signals can be input and output.

  Further, the start control microcomputer 35 has a signal indicating that the push-type start / stop switch 3 operated by the driver to turn on / off the ignition system power supply and to start / stop the engine 2 is pressed. A detection signal is input from a shift position sensor 4 that detects the position (shift position) of a shift lever (not shown) operated by the driver. Further, the start control microcomputer 35 transmits an indicator signal instructing the lighting state of the indicator 16 to the meter ECU 12 via the in-vehicle LAN (not shown).

  Further, the idle stop control microcomputer 36 includes a stop lamp signal indicating the on / off state of the stop lamp switch 5 that is turned on when the brake pedal of the vehicle is depressed and lights the stop lamp, and a vehicle speed sensor 6 that detects the vehicle speed. The detection signal from is input. Further, the idle stop control microcomputer 36 transmits an engine stop signal instructing to stop the engine 2 to the engine ECU 11 via the in-vehicle LAN (not shown), and also outputs a watch dog clear signal as a monitoring target signal every predetermined time. The signal is output to the start control microcomputer 35 via the signal line LS.

  Next, the starting device 14 includes a neutral switch 41, a starter relay 42, and a starter motor 43.

  The neutral switch 41 is configured to be turned on / off in accordance with an on / off instruction signal from the neutral switch drive circuit 33. The neutral switch 41 has one end connected to the starter relay drive circuit 32 and the other end connected to the coil of the starter relay 42. As a result, when the neutral switch 41 is turned on, a drive signal from the starter relay drive circuit 32 can be input to the starter relay 42. A drive signal from the starter relay drive circuit 34 can be input to the starter relay 42 regardless of whether the neutral switch 41 is on or off.

  When the starter relay 42 is energized by a drive signal from the starter relay drive circuit 32, the starter relay 42 supplies a power supply voltage from the DC power supply VB2 to the starter motor 43.

  The starter motor 43 is driven to start the engine 2 when a power supply voltage is supplied from the DC power supply VB2 via the starter relay 42.

  The IG relay drive circuit 31, the starter relay drive circuit 32, the neutral switch drive circuit 33, and the start control microcomputer 35 are supplied with a power supply voltage from the DC power supply VB1. The starter relay drive circuit 34 and the idle stop control microcomputer 36 are supplied with a power supply voltage from the DC power supply VB2.

  In the idle stop control system 1 configured as described above, the start control microcomputer 35 executes an engine start control process related to the start of the engine 2 and the idle stop control microcomputer 36 includes an idle stop control related to the idle stop. Execute the process.

  First, the idle stop control process executed by the idle stop control microcomputer 36 will be described with reference to FIG. FIG. 2 is a flowchart showing the idle stop control process. This idle stop control process is a process that is repeatedly executed while the idle stop control microcomputer 36 is activated (powered on).

  When this idle stop control process is executed, the idle stop control microcomputer 36 first determines in S10 whether or not a microcomputer abnormality detection signal output from the start control microcomputer 35 in the process of S280 described later is input. . Here, when the microcomputer abnormality detection signal is input (S10: YES), the idle stop control process is temporarily ended.

  On the other hand, when the microcomputer abnormality detection signal is not input (S10: NO), processing for detecting abnormality of the starter relay drive circuit 34 is performed in S20. Specifically, the following three abnormalities are detected.

  First, detection of the first abnormality is detection of overheating, overcurrent, and open failure of the starter relay drive circuit 34. This abnormality is detected by inputting a starter relay abnormality detection signal from the starter relay drive circuit 34 (see the detection line LD1 in FIG. 1).

  The detection of the second abnormality is detection of disconnection of the power supply line for supplying the power supply voltage from the DC power supply VB2 to the starter relay drive circuit 34 (see the detection line LD2 in FIG. 1).

  Furthermore, the detection of the third abnormality is detection of disconnection of the drive line for outputting a drive signal from the starter relay drive circuit 34 to the starter relay 42 (see the detection line LD3 in FIG. 1).

  Thereafter, in S30, it is determined whether or not an abnormality of the starter relay drive circuit 34 has been detected in the process of S20. Here, when it is determined that an abnormality of the starter relay drive circuit 34 has been detected (S30: YES), the idle stop control process is temporarily terminated.

  On the other hand, if it is determined that an abnormality of the starter relay drive circuit 34 has not been detected (S30: NO), it is determined in S40 whether an idle stop is possible. In the present embodiment, when the vehicle speed based on the detection signal from the vehicle speed sensor 6 is 0 km / h and the stop lamp signal indicates the on state, it is determined that the idle stop is possible.

  If it is determined that idle stop is not possible (S40: NO), the process waits by repeating the process of S40. On the other hand, when it is determined that the idle stop is possible (S40: YES), the engine 2 is automatically stopped by transmitting an engine stop signal to the engine ECU 11 via the in-vehicle LAN in S50.

  Thereafter, in S60, it is determined whether or not a microcomputer abnormality detection signal is input. Here, when the microcomputer abnormality detection signal is not input (S60: NO), in S70, the process for detecting the abnormality of the starter relay drive circuit 34 is performed in the same manner as S20.

  Then, in S80, it is determined whether or not an abnormality of the starter relay drive circuit 34 has been detected in the process of S70. If it is determined that no abnormality has been detected in the starter relay drive circuit 34 (S80: NO), is a condition for returning from the idle stop (hereinafter referred to as an idle stop return condition) established in S90? Judge whether or not. In the present embodiment, it is determined that the idle stop return condition is satisfied when the stop lamp signal indicates an off state.

  If it is determined that the idle stop return condition is not satisfied (S90: NO), the process proceeds to S60 and waits by repeating the above process. On the other hand, if it is determined that the idle stop return condition is satisfied (S90: YES), the engine 2 is restarted by causing the starter relay drive circuit 34 to output a drive signal in S100, and the idle stop control is performed. The process is temporarily terminated.

  If it is determined in S80 that an abnormality of the starter relay drive circuit 34 has been detected (S80: YES), the process proceeds to S110.

  If a microcomputer abnormality detection signal is input in S60 (S60: YES), the process proceeds to S110.

  In S110, an idle stop abnormality detection signal indicating that an idle stop abnormality has been detected is output to the start control microcomputer 35 via the signal line LS, and the idle stop control process is temporarily terminated.

  Next, the procedure of the engine start control process executed by the start control microcomputer 35 will be described with reference to FIG. FIG. 3 is a flowchart showing the engine start control process. This engine start control process is a process repeatedly executed while the start control microcomputer 35 is activated (powered on).

  When the engine start control process is executed, the start control microcomputer 35 first determines in S210 whether or not the IG relay 15 is in an on state. If the IG relay 15 is on (S210: YES), the process proceeds to S240. On the other hand, if the IG relay 15 is off (S210: NO), it is determined in S220 whether the start / stop switch 3 has been pressed.

  If the start / stop switch 3 has not been pressed (S220: NO), the process proceeds to S260. On the other hand, when the start / stop switch 3 is pressed (S220: YES), the IG relay drive circuit 31 outputs a drive signal to turn on the IG relay 15, and the process proceeds to S260.

  In S240, it is determined whether or not the start / stop switch 3 has been pressed. If the start / stop switch 3 has not been pressed (S240: NO), the process proceeds to S260. On the other hand, when the start / stop switch 3 is pressed (S240: YES), the engine 2 is started by outputting a drive signal to the starter relay drive circuit 32 in S250, and the process proceeds to S260. In order to start the engine 2 at this time, the neutral switch 41 needs to be turned on.

  In S260, a process for detecting an abnormality in the idle stop control microcomputer 36 is performed. Specifically, when the watchdog clear signal from the idle stop control microcomputer 36 is not input to the start control microcomputer 35 continuously for a predetermined monitoring time set in advance, it is determined that an abnormality of the idle stop control microcomputer 36 has occurred. .

  Thereafter, in S270, it is determined whether or not an abnormality of the idle stop control microcomputer 36 has been detected in the process of S260. If it is determined that no abnormality has been detected in the idle stop control microcomputer 36 (S270: NO), the process proceeds to S290. On the other hand, if it is determined that an abnormality of the idle stop control microcomputer 36 has been detected (S270: YES), a microcomputer abnormality detection signal indicating that an abnormality of the idle stop control microcomputer 36 has been detected is sent to the idle stop control microcomputer in S280. 36, and the process proceeds to S290.

  In S290, it is determined whether an idle stop abnormality detection signal is input from the idle stop control microcomputer 36. If an idle stop abnormality detection signal is input (S290: YES), the neutral switch 41 is turned on by causing the neutral switch drive circuit 33 to output a drive signal in S300. Further, in S310, the engine 2 is started by outputting a drive signal to the starter relay drive circuit 32, and the engine start control process is once ended.

  On the other hand, when the idle stop abnormality detection signal is not input (S290: NO), the shift position is N (neutral) or P (parking) based on the detection signal from the shift position sensor 4 in S320. Judge whether there is.

  If the shift position is N (neutral) or P (parking) (S320: YES), the neutral switch 41 is output by causing the neutral switch drive circuit 33 to output an on / off instruction signal in S330. The engine start control process is temporarily ended by turning it on.

  On the other hand, if the shift position is not N (neutral) or P (parking) (S320: NO), the neutral switch 41 is turned off by causing the neutral switch drive circuit 33 to output an on / off instruction signal in S340. Then, the engine start control process is temporarily ended.

  In the idle stop control system 1 configured as described above, first, when the IG relay 15 is in an on state and the start / stop switch 3 is pressed (S210: YES, S240: YES), the engine 2 is turned on. Start (S250). Further, when the vehicle speed based on the detection signal from the vehicle speed sensor 6 is 0 km / h and the stop lamp signal indicates the on state, it is determined that the idle stop is possible (S40: YES), When the engine 2 is stopped (S50) and the idle stop return condition is satisfied (S90: YES), the engine 2 is started (S100).

  Then, detection of an abnormality in the idle stop control microcomputer 36 and the starter relay drive circuit 34 is a period from when the engine 2 is stopped in the process of S50 to when the engine 2 is started in the process of S100 (hereinafter referred to as an idle stop period). (S60, S70, S80, S260 to S280).

  According to the idle stop control system 1 configured as described above, an abnormality in which the engine 2 cannot be started by the idle stop control microcomputer 36 and the starter relay drive circuit 34 during the idle stop period (hereinafter referred to as idle stop start). The occurrence of this idle stop start abnormality can be detected.

  That is, the idle stop control system 1 can recognize the occurrence of the idle stop start abnormality before the driver of the stopped vehicle tries to start the vehicle. In this way, measures can be taken before the vehicle starts so that the driver of the vehicle that is stopped is aware that the engine 2 will not restart for the first time when the vehicle is about to start. it can. For this reason, even when the idle stop start abnormality occurs, the engine 2 can be restarted smoothly.

  Further, in the idle stop control system 1, when the occurrence of the idle stop start abnormality is detected, the engine 2 is started (S310). For this reason, it is not necessary for the driver of the vehicle to perform the engine start operation when the idle stop start is abnormal. Therefore, the engine 2 can be smoothly restarted when the idle stop start is abnormal.

  The start control microcomputer 35 and the idle stop control microcomputer 36 are supplied with power from separate power sources. Therefore, the engine 2 is restarted after the engine 2 is stopped by the idle stop control microcomputer 36 as compared with the case where the start control microcomputer 35 and the idle stop control microcomputer 36 are supplied with power from the same power source. It is possible to suppress the occurrence of the situation where it becomes impossible to do this.

  This is because when the start control microcomputer 35 and the idle stop control microcomputer 36 are supplied with power from the same power supply, if the abnormality occurs in the same power supply, the control by the start control microcomputer 35 and the idle stop control are performed. When both of the controls by the microcomputer 36 do not function simultaneously, when the start control microcomputer 35 and the idle stop control microcomputer 36 are supplied with power from different power sources, the two power sources do not become abnormal at the same time. This is because both the control by the start control microcomputer 35 and the control by the idle stop control microcomputer 36 do not fail simultaneously.

  In the embodiment described above, the idle stop ECU 13 is the electronic control device according to claim 1 of the present invention, the idle stop control microcomputer 36 is the electronic control device according to claim 12 of the present invention, and the processing of S250 is in the present invention. The engine starting means, the processes of S40, S50, S90 and S100 are the idle stop control means in the present invention, the processes of S60, S70, S80 and S260 to S280 are the first abnormality determining means and the second abnormality determining means in the present invention, S310. The process of the first abnormal engine start means in the present invention, the processes of S40 and S50 are the idling stop process of the present invention, the processes of S90 and S100 are the engine return process of the present invention, and the process of S110 is the second process of the present invention. Informing means.

  Further, the determination conditions for the processes of S210 and S240 are the engine start condition in the present invention, the determination condition for the process of S40 is the engine stop condition in the present invention, the determination condition of the process in S90 is the engine return condition in the present invention, and the idle stop control microcomputer. Reference numeral 36 denotes a first microcomputer according to the present invention, and the start control microcomputer 35 corresponds to a second microcomputer according to the present invention.

(Second Embodiment)
The second embodiment of the present invention will be described below. In the second embodiment, only parts different from the first embodiment will be described.

  The idle stop control system 1 of the second embodiment is the same as that of the first embodiment except that the engine start control process is changed. FIG. 4 is a flowchart showing an engine start control process of the second embodiment.

  The engine start control process of the second embodiment is the same as that of the first embodiment except that the process of S310 is omitted and the process of S312 is added.

  That is, when the processing of S300 is completed, an indicator signal instructing blinking of the indicator 16 is transmitted to the meter ECU 12 in S312, thereby causing the indicator 16 to blink and temporarily ending the engine start control processing.

  In the idle stop control system 1 configured as described above, when the occurrence of the idle stop start abnormality is detected, the indicator 16 blinks (S312). For this reason, before the driver of the stopped vehicle tries to start the vehicle, the driver can be made aware that the idle stop start abnormality has occurred. Thereby, it is possible to prevent the driver of the stopped vehicle from being panicked by noticing that the engine 2 does not restart for the first time when trying to start the vehicle. For this reason, even when the idle stop start abnormality occurs, the engine 2 can be restarted smoothly.

  When the shift lever of the vehicle is located at a position other than N (neutral) and P (parking) (S320: NO), the neutral switch 41 is turned off (S340). Even if is pressed, the engine 2 does not start. On the other hand, when the occurrence of the idle stop start abnormality is detected (S290: YES), the neutral switch 41 is turned on (S300), so that the shift lever of the vehicle is located at a position other than the N (neutral) and P (parking) positions. Even when the start / stop switch 3 is depressed, the engine 2 is started (S250).

  As a result, the driver of the stopped vehicle notices that the engine 2 does not restart for the first time when the vehicle is about to start, and the shift lever of the vehicle is not set to the N or P position. Even when the start / stop switch 3 is pressed, the engine 2 can be started. For this reason, even when the idle stop start abnormality occurs, the engine 2 can be restarted smoothly.

  In the embodiment described above, the process of S312 is the first notification means in the present invention, the process of S340 is the engine start prohibiting means in the present invention, and the process of S300 is the start prohibition canceling means in the present invention.

(Third embodiment)
The third embodiment of the present invention will be described below. In the third embodiment, only parts different from the first embodiment will be described.

  The idle stop control system 1 of the third embodiment is the same as that of the first embodiment except that the engine start control process is changed. FIG. 5 is a flowchart showing an engine start control process of the third embodiment.

  The engine start control process of the third embodiment is the same as that of the first embodiment except that the process of S310 is omitted and the process of S314 is added.

  In other words, when the process of S300 is completed, the IG relay drive circuit 31 is stopped from outputting the drive signal in S314, thereby turning off the IG relay 15 and temporarily ending the engine start control process.

  In the idle stop control system 1 configured as described above, when the occurrence of the idle stop start abnormality is detected, the IG relay 15 is turned off (S314). For this reason, when the vehicle IG relay 15 is turned off during the idle stop period, the vehicle driver is turned on and the engine 2 is started. You can prompt within the stop period. Thereby, it is possible to prevent the driver of the stopped vehicle from being panicked by noticing that the engine 2 does not restart for the first time when trying to start the vehicle. For this reason, even when the idle stop start abnormality occurs, the engine 2 can be restarted smoothly.

  In the embodiment described above, the process of S314 is the IG off means in the present invention.

  As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example, As long as it belongs to the technical scope of this invention, a various form can be taken.

  For example, in the above embodiment, the indicator 16 blinks when the occurrence of the idle stop start abnormality is detected. However, the present invention is not limited to this. For example, the start / stop switch 3 may blink.

  In the above-described embodiment, the start control microcomputer 35 and the idle stop control microcomputer 36 are mounted on one electronic control unit. However, the start control microcomputer 35 and the idle stop control microcomputer 36 are provided with different electronic controls. You may make it mount in an apparatus. Thereby, each of start control microcomputer 35 and idle stop control microcomputer 36 can be made to receive supply of power from a separate power supply. For this reason, compared with the case where the start control microcomputer 35 and the idle stop control microcomputer 36 are supplied with power from the same power source, all of the start control microcomputer 35 and the idle stop control microcomputer 36 do not function simultaneously. Can be suppressed.

  In the above-described embodiment, the control for starting the engine 2 (S250) and the control for turning on / off the neutral switch 41 (S300, S320, S330, S340) are executed by the start control microcomputer 35. However, the microcomputer for executing the control for starting the engine 2, the microcomputer for executing the control for turning on / off the neutral switch 41, and the idle stop control microcomputer 36 may be mounted on separate electronic control devices. .

  Thereby, each of the microcomputer for executing the control for starting the engine 2, the microcomputer for executing the control for turning on / off the neutral switch 41, and the idle stop control microcomputer 36 may be supplied with power from different power sources. it can. For this reason, compared with the case where the microcomputer which performs the control which starts the engine 2, the microcomputer which performs the control which turns on / off the neutral switch 41, and the idle stop control microcomputer 36 are supplied with the power supply from the same power supply. It is possible to suppress the occurrence of a situation in which all of the microcomputer that executes control for starting the engine 2, the microcomputer that executes control for turning on / off the neutral switch 41, and the idle stop control microcomputer 36 do not function simultaneously.

  In the above embodiment, the indicator signal is transmitted from the start control microcomputer 35 (S312). However, the idle stop control microcomputer 36 may perform the process of transmitting the indicator signal.

  Moreover, in the said embodiment, what performed the process of S40, S50, S90, S100 by the idle stop control microcomputer 36 was shown. However, a microcomputer that executes the processes of S40 and S50 and a microcomputer that executes S90 and S100 may be provided separately and supplied with power from different power sources. As a result, the engine can be restarted by the processing of S90 and S100 after the engine is stopped by the processing of S40 and S50, compared to the case where the two microcomputers are supplied with power from the same power source. It is possible to suppress the occurrence of a situation where it is impossible to do so. The two microcomputers are the third microcomputer and the fourth microcomputer in the present invention.

1 is a block diagram showing a configuration of an idle stop control system 1. FIG. It is a flowchart which shows an idle stop control process. It is a flowchart which shows the engine starting control process of 1st Embodiment. It is a flowchart which shows the engine starting control process of 2nd Embodiment. It is a flowchart which shows the engine starting control process of 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Idle stop control system, 2 ... Engine, 3 ... Start stop switch, 4 ... Shift position sensor, 5 ... Stop lamp switch, 6 ... Vehicle speed sensor, 11 ... Engine ECU, 12 ... Meter ECU, 13 ... Idle stop ECU, DESCRIPTION OF SYMBOLS 14 ... Starter, 15 ... IG relay, 16 ... Indicator, 31 ... IG relay drive circuit, 32 ... Starter relay drive circuit, 33 ... Neutral switch drive circuit, 34 ... Starter relay drive circuit, 35 ... Start control microcomputer, 36 ... Idle stop control microcomputer, 41 ... neutral switch, 42 ... starter relay, 43 ... starter motor, VB1, VB2 ... DC power supply

Claims (17)

An electronic control device for controlling an engine mounted on a vehicle,
Engine starting means for starting the engine when a preset engine starting condition is established that indicates that an engine starting operation performed by a user of the vehicle to start the engine is performed;
An idle stop control means for stopping the engine when a preset engine stop condition is satisfied, and starting the engine when a preset engine return condition is satisfied after the engine is stopped;
It is determined whether or not an idle stop start abnormality, which is an abnormality that makes it impossible to start the engine by the idle stop control means, is made after the engine is stopped by the idle stop control means. An electronic control apparatus comprising: first abnormality determination means that is executed within a period until the engine is started by the control means. 2. The electronic control device according to claim 1, further comprising a first abnormality engine start unit that starts the engine when the first abnormality determination unit determines that the idle stop start abnormality has occurred. The function as the idle stop control means is realized by using a first microcomputer provided in the electronic control device,
The function as the engine start means at the time of the first abnormality is realized by using a second microcomputer provided in the electronic control unit,
The electronic control device according to claim 2, wherein the first microcomputer and the second microcomputer are each supplied with power from different power sources. The first notification means for notifying that the idle stop start abnormality has occurred when the first abnormality determination means determines that the idle stop start abnormality has occurred. The electronic control apparatus in any one. The IG-off means for turning off the ignition switch of the vehicle when the first abnormality determination means determines that the idle stop start abnormality has occurred. 5. Electronic control unit. Engine start prohibiting means for prohibiting start of the engine by the engine start means when the shift lever of the vehicle is located at positions other than N (neutral) and P (parking) positions;
The start prohibition canceling means for prohibiting the operation of the engine start prohibiting means when the first abnormality determining means determines that the idle stop start abnormality has occurred. An electronic control device according to any one of the above. The electronic control device according to claim 6, wherein the engine start unit, the idle stop control unit, and the engine start prohibition unit are mounted on separate electronic control units. The function as the idle stop control means is realized using a microcomputer provided in the electronic control unit,
The electronic control device according to claim 1, wherein the idle stop start abnormality is an abnormality of the microcomputer. The idle stop control means includes a starter drive circuit that drives a starter for starting the engine,
The electronic control device according to claim 1, wherein the idle stop start abnormality is an abnormality of the starter drive circuit. The idle stop control means includes a starter drive circuit that drives a starter for starting the engine,
The idle stop start abnormality is a disconnection of a drive line connected between the starter drive circuit and the starter so that the starter drive circuit drives the starter. The electronic control device according to any one of 8. The idle stop control means includes a starter drive circuit that drives a starter for starting the engine,
The electronic control device according to claim 1, wherein the idle stop start abnormality is a disconnection of a power supply line that supplies power to the starter drive circuit. An electronic control device for controlling an engine mounted on a vehicle,
An idling stop process for stopping the engine when a preset engine stop condition indicating that the engine is idling is satisfied;
An engine return process for starting the engine when a preset engine return condition is satisfied after the engine is stopped by the idling stop process; and
It is determined whether or not an idle stop start abnormality that is an abnormality that makes it impossible to start the engine by the engine return process has occurred. After the engine is stopped by the idling stop process, the engine return process is performed. An electronic control device comprising: a second abnormality determining means that is executed within a period until the engine is started by. 13. The electronic control according to claim 12, further comprising second notification means for notifying that the idle stop start abnormality has occurred when the second abnormality determination means determines that the idle stop start abnormality has occurred. apparatus. A starter drive circuit for driving a starter for starting the engine;
The electronic control device according to claim 12 or 13, wherein the idle stop start abnormality is an abnormality of the starter drive circuit. A starter drive circuit for driving a starter for starting the engine;
The idle stop start abnormality is a disconnection of a drive line connected between the starter drive circuit and the starter in order for the starter drive circuit to drive the starter. 14. The electronic control device according to any one of 14. A starter drive circuit for driving a starter for starting the engine;
The electronic control device according to any one of claims 12 to 15, wherein the idle stop start abnormality is a disconnection of a power supply line that supplies power to the starter drive circuit. The function as the idling stop process is realized by using a third microcomputer provided in the electronic control unit,
The function as the engine return process is realized by using a fourth microcomputer provided in the electronic control unit,
The electronic control device according to any one of claims 12 to 16, wherein the third microcomputer and the fourth microcomputer are each supplied with power from separate power sources.

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