JP2016169633A - Electronic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic control device capable of keeping driving of a stater motor in lowering operation voltage even though a constitution is simple.SOLUTION: An electronic control device 1 implements reset on the basis of that operation voltage is lowered to be a first threshold voltage or less. The electronic control device 1 includes a driving section for driving a stator relay SR on/off, and a control section for controlling an on-state and an off-state of the starter relay SR. The driving section has a starter driving register 24 which memorizes set information indicating whether the starter relay SR is set in the on-state or the off-state, and switches the on-state and the-off state of the starter relay SR on the basis of the set information memorized in the starter operation register 24. Further the driving section has a second threshold voltage smaller than the first threshold voltage, and resets the starter driving register 24 under a condition that the operation voltage reaches the second threshold voltage or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic control unit that controls driving of a starter.

  Conventionally, there is an apparatus described in Patent Document 1 as an apparatus for controlling driving of a starter motor of a vehicle. The device described in Patent Document 1 includes two ECUs (Electrical Control Units) that drive the starter relay on / off. The limit value of the operating voltage of one ECU is set lower than the limit value of the operating voltage of the other ECU. In the device described in Patent Document 1, when the battery voltage drops due to the drive of the starter motor, the ECU with the lower limit value of the operating voltage maintains the starter relay in the on state, thereby maintaining the drive of the starter motor. doing.

JP 2008-291863 A

  By the way, in the electronic control device described in Patent Document 1, it is necessary to link the control processes of the two ECUs in order to control the drive of the starter motor, which may complicate the control process.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electronic control device that can maintain the drive of the starter motor when the operating voltage is reduced while having a simple configuration. is there.

  In order to solve the above-mentioned problem, the electronic control device (1) that controls the drive of the starter relay (SR) and is reset based on the operating voltage dropping below the first threshold voltage, A drive unit (20) that is driven off / off, and a control unit (30) that controls an on state and an off state of the starter relay by transmitting a control signal to the drive unit. The drive unit has a starter drive register (24) in which setting information indicating whether the starter relay is set to an on state or an off state is stored, and based on the setting information stored in the starter drive register, Switch between on and off states. In addition, the driving unit resets the starter driving register on condition that the driving unit has a second threshold voltage lower than the first threshold voltage and the operating voltage drops below the second threshold voltage.

  According to this configuration, even when the electronic control device is reset due to the operation voltage of the electronic control device being lowered to the first threshold voltage or less as the starter motor is driven, the operation voltage is greater than the second threshold voltage. The starter drive register is not reset. Therefore, if the setting information for turning on the starter relay is stored in the starter drive register, the information remains stored in the starter drive register, so that the starter relay is maintained in the on state. Therefore, the drive of the starter motor can be maintained when the operating voltage is lowered even though the electronic control device for controlling the drive of the starter relay has a simple configuration.

  According to the present invention, it is possible to maintain the drive of the starter motor when the operating voltage is lowered, although the configuration is simple.

It is a block diagram which shows schematic structure of 1st Embodiment of an electronic controller. It is a flowchart which shows the procedure of the process performed by the microcomputer about the electronic control apparatus of 1st Embodiment. (A)-(H) is a timing chart which shows transition of a drive voltage, a main operating voltage, a reset signal, a POR signal, an engine speed, a starter drive register, a starter switch, and an ignition switch. It is a flowchart which shows the procedure of the process performed by the microcomputer about the modification of 1st Embodiment of an electronic controller. It is a block diagram which shows schematic structure of 2nd Embodiment of an electronic controller. It is a flowchart which shows the procedure of the process performed by the microcomputer about the electronic control apparatus of 2nd Embodiment. It is a flowchart which shows the procedure of the process performed by the microcomputer about the modification of 1st Embodiment of an electronic controller.

<First Embodiment>
Hereinafter, an embodiment of the electronic control device will be described. An electronic control device 1 shown in FIG. 1 is a so-called engine control device that comprehensively controls driving of a vehicle engine. Hereinafter, the electronic control device 1 is abbreviated as “ECU1”.

  As shown in FIG. 1, the ECU 1 includes a power supply IC 10, a driver IC 20, and a microcomputer 30. Hereinafter, for convenience, the microcomputer 30 is abbreviated as “microcomputer 30”. In the present embodiment, the driver IC 20 corresponds to a drive unit, and the microcomputer 30 corresponds to a control unit.

  The battery voltage VBAT of the vehicle battery 2 is applied to the power supply IC 10 as the drive voltage VB via the ignition switch 3. That is, when the ignition switch 3 is turned on by the driver of the vehicle, the drive voltage VB is applied to the power supply IC 10. When the ignition switch 3 is turned off by the driver of the vehicle, the supply of the drive voltage VB to the power supply IC 10 is cut off. Further, the battery voltage VBAT is directly applied to the power supply IC 10. The power supply IC 10 generates the main operating voltage VOM based on the driving voltage VB. The main operating voltage VOM is used for operating the driver IC 20 and the microcomputer 30. Further, the power supply IC 10 generates a backup operation voltage VOS based on the battery voltage VBAT. The backup operating voltage VOS enables power supply to an electronic component such as a RAM (not shown) of the ECU 1 when the ignition switch 3 is turned off, for example. As a result, the ECU 1 can hold various data even when the ignition switch 3 is turned off.

  The driver IC 20 drives the starter motor M via the starter relay SR. The driver IC 20 drives engine devices (not shown) other than the starter motor M such as an engine injector and a variable valve mechanism. The driver IC 20 can perform serial communication with the microcomputer 30. The serial communication between the driver IC 20 and the microcomputer 30 employs serial communication based on a microsecond channel. As a result, the communication between the driver IC 20 and the microcomputer 30 can be speeded up.

  The driver IC 20 includes an MSC (Micro Second Channel) controller 21, an engine drive register 22, an engine drive circuit 23, a starter drive register 24, and a starter relay drive circuit 25.

  The MSC controller 21 controls serial communication based on a microsecond channel performed with the microcomputer 30. For example, the MSC controller 21 performs processing for converting serial data downstream from the microcomputer 30 to the driver IC 20 into parallel data. Further, the MSC controller 21 converts the parallel data generated in the driver IC 20 into serial data, and upstreams the serial data to the microcomputer 30.

  The engine drive circuit 23 drives the engine device by transmitting a predetermined drive signal to an engine device (not shown) based on the setting information stored in the engine drive register 22. A main operating voltage VOM is applied to the engine drive register 22.

  The starter relay drive circuit 25 outputs the starter drive signal STA to the starter relay SR based on the setting information stored in the starter drive register 24, thereby driving the starter relay SR on / off. The setting information stored in the starter drive register 24 is information indicating whether the starter relay SR is set to an on state or an off state.

  Specifically, the starter relay SR has a relay coil RC and a relay switch RSW. A drive voltage VB is applied to one end of the relay coil RC. The other end of the relay coil RC is connected to the starter relay drive circuit 25. A drive voltage VB is applied to one end of the relay switch RSW. A starter motor M is connected to the other end of the relay switch RSW. The starter relay drive circuit 25 outputs a starter drive signal STA set to a high level when the starter drive register 24 is set to an off state. Thereby, the drive current of relay coil RC is interrupted, and relay switch RSW is turned off. Therefore, the starter motor M is not driven. The starter relay drive circuit 25 outputs a starter drive signal STA set to a low level when the starter drive register 24 is set to an on state. As a result, the drive voltage VB is applied to the relay coil RC, a drive current flows through the relay coil RC, and the relay switch RSW is turned on. Therefore, the drive voltage VB is applied to the starter motor M, and the starter motor M is driven.

  A backup operating voltage VOS is applied to the starter drive register 24. Therefore, even when the drive voltage VB is interrupted by turning off the ignition switch 3, the on / off setting information stored in the starter drive register 24 is retained.

  The microcomputer 30 has an MSC controller 31 and a standby memory 32. In the present embodiment, the standby memory 32 corresponds to a storage unit.

  The MSC controller 31 controls serial communication based on a microsecond channel performed with the driver IC 20. For example, the MSC controller 31 performs processing for converting serial data upstream from the driver IC 20 to the microcomputer 30 into parallel data. Further, the MSC controller 31 converts the parallel data generated in the microcomputer 30 into serial data, and downstream the data frame DF corresponding to the serial data to the driver IC 20.

  The standby memory 32 stores data to be held when the ignition switch 3 is turned off, such as a learning value. A backup operating voltage VOS is applied to the standby memory 32. That is, even when the drive voltage VB is cut off by turning off the ignition switch 3, the information stored in the standby memory 32 is retained.

  One end of a starter switch 4 is connected to the microcomputer 30. A battery voltage VBAT is applied to the other end of the starter switch 4. That is, when the starter switch 4 is turned on by the driver of the vehicle, the battery voltage VBAT is applied from the starter switch 4 to the microcomputer 30. The microcomputer 30 determines that the starter switch 4 is in the ON state when the battery voltage VBAT is applied from the starter switch 4. Further, the microcomputer 30 determines that the starter switch 4 is in an OFF state when the battery voltage VBAT is not applied from the starter switch 4.

  The microcomputer 30 captures the output signal of the rotation sensor 5. The rotation sensor 5 detects the engine speed (rotation speed) NE and outputs a signal corresponding to the detected engine speed NE. The microcomputer 30 detects the engine speed NE based on the output signal of the rotation sensor 5.

  In addition to the respective output signals of the starter switch 4 and the rotation sensor 5, the microcomputer 30 controls engine control such as an accelerator sensor that detects the amount of depression of the accelerator pedal, an intake air amount sensor that detects the intake air amount of the engine, and the like. The outputs of the various sensors are taken in. The microcomputer 30 generates a control signal based on output signals from various sensors. The control signal includes instruction values of the engine drive register 22 and the starter drive register 24. The microcomputer 30 generates a data frame DF including this control signal. The microcomputer 30 controls the drive of the starter motor M and other engine devices by switching the setting information of the engine drive register 22 and the starter drive register 24 by transmitting the data frame DF to the driver IC 20.

Next, the reset configuration of the ECU 1 will be described.
The ECU 1 has a function of resetting (initializing) the driver IC 20 and the microcomputer 30 based on a reset signal output from the power supply IC 10. Specifically, the power supply IC 10 transmits a reset signal to the driver IC 20 and the microcomputer 30. The power supply IC 10 sets the signal level of the reset signal to a high level when there is no need to reset the driver IC 20 and the microcomputer 30. The power supply IC 10 constantly monitors whether or not the main operating voltage VOM is equal to or lower than the reset threshold voltage Vth1. In the present embodiment, the reset threshold voltage Vth1 corresponds to the first threshold voltage. The power supply IC 10 switches the signal level of the reset signal from the high level to the low level when the main operating voltage VOM becomes equal to or lower than the reset threshold voltage Vth1. When the driver IC 20 and the microcomputer 30 detect that the signal level of the reset signal is switched from the high level to the low level, the driver IC 20 and the microcomputer 30 perform the reset. For example, in the driver IC 20, a reset signal is input to the engine drive register 22. The engine drive register 22 performs a reset based on the signal level of the reset signal being switched from a high level to a low level. That is, the engine drive register 22 is set to an off state.

  The driver IC 20 has an internal power-on reset (POR) function that resets the starter drive register 24 based on the main operating voltage VOM. Specifically, the driver IC 20 transmits a POR signal to the starter drive register 24. When it is not necessary to reset the starter drive register 24, the driver IC 20 sets the signal level of the POR signal to a high level. The driver IC 20 switches the signal level of the POR signal from the high level to the low level on condition that the main operating voltage VOM becomes equal to or lower than the POR threshold voltage Vth2. The POR threshold voltage Vth2 is set to a value smaller than the reset threshold voltage Vth1, and is set to a value larger than the minimum voltage that can ensure the driving of the driver IC 20. In the present embodiment, the POR threshold voltage Vth2 corresponds to the second threshold voltage. The starter drive register 24 performs a reset based on the POR signal being switched from a high level to a low level. That is, the starter driving register 24 is set to an off state.

Next, drive control of the starter motor M by the microcomputer 30 will be described in detail.
For example, when the driver who has boarded the vehicle turns on the starter switch 4, the on-operation of the starter switch 4 is detected by the microcomputer 30. When the microcomputer 30 detects an ON operation of the starter switch 4, the microcomputer 30 transmits a data frame including a starter control signal for setting the starter driving register 24 to the ON state to the driver IC 20 via the MSC controller 31. When this data frame is received by the MSC controller 21 of the driver IC 20, the MSC controller 21 transmits a starter control signal included in the data frame to the starter driving register 24. When the starter drive register 24 is set to the on state based on the starter control signal, the starter relay SR is turned on and the starter motor M is driven.

  Thereafter, when the driver turns off the starter switch 4, the turn-off operation of the starter switch 4 is detected by the microcomputer 30. When the microcomputer 30 detects an off operation of the starter switch 4, the microcomputer 30 transmits a data frame including a starter control signal for setting the starter driving register 24 to an off state to the driver IC 20 via the MSC controller 31. When this data frame is received by the MSC controller 21 of the driver IC 20, the MSC controller 21 transmits a starter control signal included in the data frame to the starter driving register 24. When the starter drive register 24 is changed from the on state to the off state based on the starter control signal, the starter relay SR is turned off and the starter motor M is stopped.

  By the way, when the starter motor M is driven based on the ON operation of the starter switch 4, since a large current is supplied from the battery 2 to the starter motor M, the battery voltage VBAT decreases. When the main operating voltage VOM becomes equal to or lower than the reset threshold voltage Vth1 due to this, the signal level of the reset signal output from the power supply IC 10 is switched from the high level to the low level, so that the driver IC 20 and the microcomputer 30 are reset. If the starter switch 4 is turned off while the microcomputer 30 is being reset, the microcomputer 30 cannot detect the turn-off operation of the starter switch 4. In such a case, since the starter drive register 24 cannot be changed from the on state to the off state, the starter motor M may continue to be driven.

  Further, when the microcomputer 30 that has returned from the reset starts transmission of a data frame to the driver IC 20, there is a possibility that the starter control signal included in the data frame is reset. Therefore, when the starter drive register 24 is set to the on state, that is, when the starter motor M is driven, when the microcomputer 30 that has returned from the reset starts transmitting a data frame to the driver IC 20, the starter drive is started. The register 24 is changed from the on state to the off state, and the starter motor M may stop. In such a situation, there is a concern that the starter motor M is not sufficiently driven and the engine cannot be started.

  In order to eliminate these concerns, the microcomputer 30 executes the processing shown in FIG. 2 when returning from reset. That is, the microcomputer 30 first invalidates the transmission of the data frame to the driver IC 20 (step S1). That is, the microcomputer 30 stops transmitting the control signal to the driver IC. Subsequent to step S1, the microcomputer 30 acquires setting information of the starter drive register 24 from the driver IC 20 (step S2), and sets a starter control signal based on the acquired setting state (step S3). Subsequent to step S3, the microcomputer 30 validates transmission of the data frame to the driver IC 20 (step S4). As a result, a data frame including a starter control signal corresponding to the setting information of the starter drive register 24 is transmitted from the microcomputer 30 to the driver IC 20. That is, when the setting information of the starter driving register 24 is set to the on state, the setting state is maintained.

  Following the process of step S4, the microcomputer 30 determines whether or not the engine has been started based on the engine speed NE (step S5). If it is determined that the engine has started (step S5: YES), the microcomputer 30 transmits a data frame including a starter control signal for setting the starter drive register 24 to the off state to the driver IC 20 (step S6). .

Next, the operation and effect of the ECU 1 of the present embodiment will be described.
As shown in FIG. 3H, when the driver turns on the ignition switch 3 at time t1, as shown in FIG. 3A, the drive voltage VB input to the power supply IC 10 increases. As a result, as shown in FIG. 3B, the main operating voltage VOM generated by the power supply IC 10 increases. Thereafter, as shown in FIGS. 3C and 3D, both the reset signal generated by the power supply IC 10 and the POR signal generated by the driver IC 20 are set to a high level.

  As shown in FIG. 3G, when the driver turns on the starter switch 4 at time t2, the starter drive register 24 is set in the on state as shown in FIG. The drive of the motor M is started. As the starter motor M starts to be driven, as shown in FIGS. 3A and 3B, the drive voltage VB and the main operating voltage VOM are lowered. Thereby, when the main operating voltage VOM becomes equal to or lower than the reset threshold voltage Vth1 at time t3, the signal level of the reset signal is switched from the high level to the low level as shown in FIG. Therefore, the driver IC 20 and the microcomputer 30 are reset at time t3. At this time, if the main operating voltage VOM does not become equal to or lower than the POR threshold voltage Vth2, the signal level of the POR signal is maintained at a high level as shown in FIG. Thereby, as shown in FIG. 3F, the setting information of the starter drive register 24 is maintained in the ON state. Therefore, even when the driver IC 20 and the microcomputer 30 are reset, the drive of the starter motor M can be continued. As described above, in this embodiment, the starter motor M can be kept driven when the main operating voltage VOM is reduced, although the ECU for controlling the starter motor M has a simple configuration.

  As shown in FIGS. 3A and 3B, after time t3, the drive voltage VB and the main operating voltage VOM rise, and when the main operating voltage VOM exceeds the reset threshold voltage Vth1 at time t5, FIG. As shown in C), the signal level of the reset signal is switched from the low level to the high level. Therefore, the driver IC 20 and the microcomputer 30 return from reset at time t5. At this time, since the microcomputer 30 reads the setting information of the starter driving register 24 and transmits a data frame including a starter control signal corresponding to the setting information to the driver IC 20, as shown in FIG. The starter drive register 24 can be maintained in the on state. Therefore, since the concern that the starter motor M stops when the microcomputer 30 returns from reset can be resolved, engine startability can be ensured.

  After time t5, when the microcomputer 30 determines at time t6 that the engine has started based on the transition of the engine speed NE shown in FIG. 3E, the microcomputer 30 sets the starter drive register 24 to the off state. A data frame including the control signal is transmitted to the driver IC 20. As a result, the starter drive register 24 is set to the OFF state, and the starter motor M is stopped. In other words, the microcomputer 30 determines when to change the setting information of the starter drive register 24 to turn off the starter relay SR based on the engine speed NE. When the setting information of the starter drive register 24 is changed in this way, for example, as shown in FIG. 3G, the starter switch 4 is turned off at time t4 within the period in which the microcomputer 30 is reset. However, even when the microcomputer 30 cannot detect the off operation of the starter switch 4, the starter motor M can be stopped.

(Modification)
Next, a modified example of the ECU 1 of the first embodiment will be described.
The microcomputer 30 of the present modification stores the same information as the setting information of the starter drive register 24 in the standby memory 32. Further, the microcomputer 30 executes the process of step S7 shown in FIG. 4 instead of the process of step S2 shown in FIG. That is, the microcomputer 30 acquires setting information of the starter drive register 24 from the standby memory 32. Even if it is such a structure, the effect similar to ECU1 of 1st Embodiment can be acquired.

Second Embodiment
Next, a second embodiment of the ECU 1 will be described. Hereinafter, the difference from the first embodiment will be mainly described.

  In the ECU 1 according to the first embodiment, after the starter drive register 24 is set to the on state, if any abnormality occurs in the microcomputer 30 and communication between the microcomputer 30 and the driver IC 20 is interrupted, the starter drive register 24 is turned off. Cannot change to state. That is, there is a possibility that the starter driving register 24 is maintained in the ON state. In this case, the starter motor M continues to be driven, which is not preferable.

  Therefore, the driver IC 20 of the present embodiment forcibly switches the starter drive register 24 to the off state when communication from the microcomputer 30 is interrupted. Details will be described below.

  As shown in FIG. 5, the driver IC 20 of this embodiment further includes a monitor circuit 26. The monitor circuit 26 has a timer 260. The monitor circuit 26 monitors the communication state of the MSC controller 21. The monitor circuit 26 also monitors a reset signal transmitted from the power supply IC 10. The monitor circuit 26 repeatedly executes the process shown in FIG. 6 at a predetermined cycle based on the communication state of the MSC controller 21 and the reset signal.

  As shown in FIG. 6, the monitor circuit 26 determines whether or not the reset of the driver IC 20 and the microcomputer 30 has been executed (step S10). Specifically, the monitor circuit 26 determines that the reset of the driver IC 20 and the microcomputer 30 has been executed when the signal level of the reset signal is switched from the high level to the low level. If the driver IC 20 and the microcomputer 30 have not been reset (step S10: NO), the monitor circuit 26 ends the process.

  When the driver IC 20 and the microcomputer 30 are reset (step S10: YES), the monitor circuit 26 starts counting of the timer 260 (step S11) and is reset based on the count value of the timer 260. It is determined whether or not a predetermined time has elapsed from the point in time (step S12). If the predetermined time has not elapsed since the reset was executed (step S12: NO), the monitor circuit 26 determines whether the microcomputer 30 is communicating based on the communication state of the MSC controller 21 ( Step S13). The monitor circuit 26 resets the count value of the timer 260 when the microcomputer 30 communicates (step S13: YES) before the predetermined time has elapsed since the reset is executed (step S12: NO). (Step S15), the process ends.

  The monitor circuit 26 sets the starter drive register 24 to the OFF state when the predetermined time has elapsed since the reset was executed (step S12: YES) without the microcomputer 30 performing communication (step S13: NO). After (step S14), the count value of the timer 260 is reset (step S15).

  According to the ECU 1 of the present embodiment, even when communication between the microcomputer 30 and the driver IC 20 is interrupted due to some abnormality in the microcomputer 30 after the starter driving register 24 is set to the on state, the starter driving register 24 is Return to the off state. Therefore, a situation where the starter motor M continues to be driven can be avoided.

(Modification)
Next, a modified example of the ECU 1 of the second embodiment will be described.
The monitor circuit 26 of the present modification executes the process shown in FIG. 7 instead of the process shown in FIG. That is, the monitor circuit 26 first determines whether or not the starter drive register 24 is set to an on state (step S20). If the starter drive register 24 is not set to the on state (step S20: NO), the monitor circuit 26 ends the process.

  When the starter drive register 24 is set to the on state (step S20: YES), the monitor circuit 26 starts counting of the timer 260 (step S21), and based on the count value of the timer 260, the monitor circuit 26 sets the starter drive register 24. It is determined whether or not a predetermined time has elapsed since the on setting time (step S22). If the predetermined time has not elapsed since the starter drive register 24 was set to ON (step S22: NO), the monitor circuit 26 determines whether or not the starter drive register 24 has been set to the OFF state (step S23). ). When the starter drive register 24 is set to an off state (step S22: NO) before the predetermined time has elapsed since the starter drive register 24 is set to on (step S22: NO), the monitor circuit 26 sets a timer. The count value of 260 is reset (step S25), and the process ends.

  When the starter driving register 24 is set to the on state (step S23: NO) and the predetermined time has elapsed since the starter driving register 24 is set to the on state (step S22: YES), the monitor circuit 26 starts driving the starter. After setting the register 24 to the off state (step S24), the count value of the timer 260 is reset (step S25).

  According to such a configuration, like the ECU 1 of the second embodiment, after the starter drive register 24 is set to the on state, some abnormality occurs in the microcomputer 30 and communication between the microcomputer 30 and the driver IC 20 is interrupted. Even in this case, the starter drive register 24 is returned to the off state. Therefore, a situation where the starter motor M continues to be driven can be avoided as in the ECU 1 of the second embodiment.

<Other embodiments>
In addition, each said embodiment can also be implemented with the following forms.
As a communication method between the driver IC 20 and the microcomputer 30, for example, SPI (Serial Peripheral Interface) communication, SCI (Serial Communication Interface) communication, or the like can be adopted.

  -ECU1 of each embodiment is not restricted to ECU which controls the drive of an engine, It can apply to appropriate ECU.

  -This invention is not limited to said specific example. That is, the above-described specific examples that are appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above, their arrangement, conditions, and the like are not limited to those illustrated, and can be changed as appropriate. Moreover, each element with which embodiment mentioned above is provided can be combined as long as it is technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

SR: Starter relay 1: Electronic control unit (ECU)
5: Rotation sensor 20: Driver IC (drive unit)
24: Starter drive register 30: Microcomputer (control unit)
32: Standby memory (storage unit)

Claims (8)

An electronic control device (1) that controls the driving of the starter relay (SR) and that is reset based on a decrease in operating voltage below a first threshold voltage,
A drive unit (20) for driving the starter relay on / off;
A control unit (30) for controlling an on state and an off state of the starter relay by transmitting a control signal to the drive unit,
The drive unit is
A starter driving register (24) in which setting information indicating whether the starter relay is set to an on state or an off state is stored;
Based on the setting information stored in the starter drive register, the on-state and off-state of the starter relay are switched,
Having a second threshold voltage lower than the first threshold voltage;
The electronic control device according to claim 1, wherein the starter driving register is reset on condition that the operating voltage drops below the second threshold voltage. The electronic control device according to claim 1.
The control unit reads the setting information of the starter drive register when returning from the reset, and generates the control signal based on the setting information of the starter drive register. The electronic control device according to claim 1.
The controller is
A storage unit (32) for storing the same information as the setting information of the starter drive register;
An electronic control device, comprising: when returning from the reset, reads setting information of the starter drive register from the storage unit and generates the control signal based on the setting information of the starter drive register. In the electronic control unit according to any one of claims 1 to 3,
A rotation sensor (5) for detecting the rotation speed of the engine of the vehicle;
The electronic control device, wherein the control unit determines a time to change setting information of the starter drive register to turn off the starter relay based on a rotation speed of the engine. In the electronic control unit according to any one of claims 1 to 4,
The electronic control device according to claim 1, wherein communication between the control unit and the driving unit is performed as serial communication based on a microsecond channel. The electronic control device according to claim 5.
The electronic control device according to claim 1, wherein when the control unit returns from the reset, the control unit invalidates transmission of the data frame to the drive unit until a setting information of the starter drive register is acquired. The electronic control device according to claim 5 or 6,
The drive unit displays setting information of the starter drive register to turn off the starter relay if the control unit does not communicate during a period from when the reset is performed until a predetermined time elapses. An electronic control device that is forcibly changed. The electronic control device according to claim 5 or 6,
The drive unit sets the starter drive register setting information to turn off the starter relay when the setting information for turning on the starter relay has been stored in the starter drive register for a predetermined time. An electronic control device that is forcibly changed.

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