JP2005090301A - Engine starter of idling stop vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow operation diagnosis of a starter automatic operating circuit for restarting an engine after idling stop when the engine is started by ignition key operation of an occupant at the initial time of starting vehicle traveling. <P>SOLUTION: This engine starter comprises a manual operation circuit 13a, 11b, 14, 9a and 9b for supplying electricity from a battery 6 to a starter 8 through a key switch 10 and an automatic operation circuit 13b, 11a, 15, 9a and 9b for shutting off supply of electricity through the manual operation circuit and for supplying electricity from the battery 6 to the starter 8 through an idling stop relay 11a. When key switches 10a, 10b are tuned on, the starter is operated through the manual operation circuit and after lapse of a predetermined time the starter 8 is successively operated through the automatic operation circuit in place of the manual operation circuit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an engine starter for an idle stop vehicle, and more particularly to an improved diagnosis method.

  The starter relay is turned on (closed) by the ignition key switch operated by the occupant, and the starter relay is turned on by the controller when the engine is restarted after idling stop. An engine starter having an automatic start mode for automatically starting an engine by energizing a battery to a starter is known (see, for example, Patent Document 1).

  Normally, the engine is started by energizing the motor generator from the running battery.If the engine cannot be started by the motor generator due to a voltage drop in the running battery, the starter is energized from the vehicle battery. An engine starter configured to start an engine is known (see, for example, Patent Document 2).

Prior art documents related to the invention of this application include the following.
JP 2003-148310 A JP 2000-064873 A

  However, in the former engine starter described above, manual start is always performed at the time of the first engine start. Therefore, the automatic start operation cannot be diagnosed at the time of the first engine start, and at the time of engine restart after the idle stop. Only when this is the case may the inoperability of automatic start be found.

  In the latter engine starting device, the engine is started by the starter only when the engine cannot be started by the motor generator during normal driving. Therefore, during normal driving, the operation diagnosis of the engine starting by the vehicle battery and the starter is performed. Inability to operate may be found only when the engine is started by the vehicle battery and the starter.

  A manual operation circuit that supplies power from the battery to the starter via the key switch, and an automatic operation circuit that cuts off the supply of power via the manual operation circuit and supplies power from the battery to the starter via the idle stop relay In addition, when the key switch is turned on (closed), the starter is operated by the manual operation circuit, and after the predetermined time has elapsed, the starter is continuously operated by the automatic operation circuit instead of the manual operation circuit.

  According to the present invention, when the engine is started by the ignition key at the beginning of vehicle operation, the operation diagnosis of the starter automatic operation circuit is performed, and the reliability of the apparatus can be improved.

  An embodiment in which the present invention is applied to a hybrid vehicle using either one or both of an engine and a motor generator as a travel drive source of the vehicle will be described.

  FIG. 1 shows the configuration of an embodiment. The output shaft of the engine 1 and the output shaft of the motor generator 2 are connected by a belt mechanism 3, and the driving force of either one or both of the engine 1 and the motor generator 2 is transmitted to the drive wheels 5 a and 5 b via the transmission 4. Communicated. The motor generator 2 is a three-phase AC machine, and three-phase AC power is supplied to the motor generator 2 from the 14V battery 6 via the inverter 7.

  On the other hand, a starter 8 of a DC motor is connected to the engine 1, and DC power is supplied to the starter 8 from a 14V battery 6 through a starter relay contact 9a. The motor generator 2 can perform a power running operation that generates a driving force for driving the vehicle, a power generating operation that is driven by the engine 1 to generate power, and a regenerative operation that generates power by absorbing the driving energy of the vehicle. The 14V battery 6 is charged by the electric power during the power generation operation and the regenerative operation of the motor generator 2.

  The key switch contacts 10a and 10b are switch contacts that are turned on (closed) at the same time that the ignition key operated by the occupant is set at the engine start position ST, and is a switch for "manual operation" of the starter 8. The key switch contact 10a is a contact for outputting to the controller 12 that the ignition key has been set at the engine start position ST, and the key switch contact 10b supplies the power of the 14V battery 6 to the starter 8 during "manual operation". It is a contact point for.

  On the other hand, the idle stop relay contact 11a is a switch that is turned on when the idle stop relay coil 11b is excited by the controller 12, and is a switch for "automatic operation" and "automatic stop" of the starter 8 at the time of idle stop. . During “automatic operation”, the power of the 14V battery 6 is supplied to the starter 8 via the idle stop relay contact 11a, and when “automatic stop”, the idle stop relay contact 11a is turned off (opened) to switch from the 14V battery 6 to the starter 8. Power supply is cut off.

  The change-over switch 13 is an “automatic / manual change-over switch” for switching whether the starter 8 is operated manually or automatically. When the changeover switch coil 13c is excited by the controller 12, the changeover switch 13 is switched to the idle stop relay side contact 13b (automatic operation side), the idle stop relay side contact 13b of the changeover switch 13 from the 14V battery, and the idle stop relay contact. The starter relay coil 9b is energized through 11a and the diode 15. As a result, the starter relay contact 9a is closed and power is supplied from the 14V battery 6 to the starter 8. That is, the starter 8 is “automatically operated” by the controller 12.

  On the other hand, when the changeover switch coil 13c is de-energized by the controller 12, the changeover switch 13 is switched to the key switch side contact 13a (manual operation side), and the key switch side contact 13a of the changeover switch 13 from the 14V battery 6 is switched. The starter relay coil 9b is energized through the key switch contact 10b and the diode 14. As a result, the starter relay contact 9a is closed and power is supplied from the 14V battery 6 to the starter 8. That is, the starter 8 is “manually operated” in conjunction with the passenger's ignition key operation.

  The controller 12 includes a CPU 12a, a memory 12b, an A / D converter 12c, a timer 12d, etc., and manual / automatic switching control of the changeover switch 13, ON / OFF of the idle stop relay coil 11b, control of the inverter 7, the engine 1 and the transmission, etc. I do. The controller 12 includes a vehicle speed sensor 16 that detects the vehicle speed, an accelerator opening sensor 17 that detects the amount of depression of an accelerator pedal (not shown), a brake hydraulic sensor 18 that detects the hydraulic pressure of the master cylinder, and a shift lever (not shown). A shift position sensor 19 for detecting the position, an engine rotation sensor 20 for detecting the rotational speed Ne of the engine 1, a voltage sensor 21 for detecting the voltage VB of the 14V battery 6 and the like are connected.

  2 to 3 are flowcharts showing the engine start control according to the embodiment, and FIG. 4 is a time chart showing the operation of each part at the time of engine start. The operation of one embodiment will be described with reference to these drawings. When the occupant sets the ignition key to the engine start position ST and the key switch contacts 10a and 10b are turned on (see time t1 in FIG. 4), the CPU 12a of the controller 12 starts executing this control program.

  In step 1, the timer 12d starts measuring the on time Ton of the key switch contacts 10a and 10b. In the subsequent step 2, the automatic / manual switch 13 is switched to the key switch contact 13a. As shown in FIG. 4, the initial state of the automatic / manual switch 13 may be the key switch contact side 13a.

  At this time, the starter relay coil 9b is energized from the 14V battery 6 via the changeover switch contact 13a, the key switch contact 10b and the diode 14, and the starter relay contact 9a is turned on (closed). As a result, electric power is supplied from the 14V battery 6 to the starter 8 through the starter relay contact 9a, and the starter 8 is activated to start cranking of the engine 1 (see time t1 in FIG. 4).

  In step 3, it is confirmed whether or not the ON time Ton of the key switch contacts 10a and 10b is equal to or longer than the predetermined time T1. The predetermined time T1 is set to an appropriate time during which it is possible to recognize that cranking of the engine 1 has been started by operating the ignition key. When the key switch ON time Ton has passed the predetermined time T1, the routine proceeds to step 4 where the idle stop relay coil 11b is energized and the contact 11a is turned on (closed). In step 5, the automatic / manual switch 13 is set to the idle stop relay. Switching to the side contact 13b (see time t2 in FIG. 4).

  As a result, the starter relay coil 9b is energized from the 14V battery 6 via the changeover switch contact 13b, the idle stop relay contact 11a and the diode 15, and the starter relay contact 9a continues to be on (closed). Therefore, electric power is continuously supplied from the 14V battery 6 to the starter 8 via the starter relay contact 9a, and the starter 8 continues operation and continues cranking of the engine 1.

  Since the automatic / manual changeover switch 13 is switched to the idle stop relay side contact 13b (automatic operation side) and the idle stop relay 11a is turned on at the time t2 after the predetermined time T1 after the starter 8 is started at the time t1, At the time t2, the operation of the starter 8 is switched from “manual operation” by the ignition key to “automatic operation” by the controller 12.

  Since the automatic operation of the starter 8 is necessary when the engine is restarted after the idle stop, it is necessary to diagnose whether the automatic operation can be normally performed when the engine is manually started at the beginning of vehicle operation. In step 6, the automatic operation of the starter 8 is diagnosed. After a predetermined time T2 from time t2 when the operation of the starter 8 is switched from manual operation to automatic operation, it is confirmed whether or not the voltage VB of the 14V battery 6 detected by the voltage sensor 21 is equal to or lower than the predetermined voltage V1 (time in FIG. 4). (See t2 + T2).

  Here, the predetermined voltage V1 is an appropriate battery voltage that can confirm that the battery voltage VB decreases and the starter 8 is driven when the 14V battery 6 is driven by supplying power to the starter 8. Should be set. In this embodiment, the battery voltage VB is compared with the predetermined voltage V1 to determine whether or not the automatic operation of the starter 8 is normal. However, the amount of decrease in the battery voltage VB or the current flowing through the battery 6 is shown. Whether or not the starter automatic operation is normal may be determined based on the above.

  When the battery voltage VB is higher than the predetermined voltage V1, that is, when the starter 8 is operated and the cranking of the engine 1 is started, but the voltage drop of the 14V battery 6 is not or is low, the process proceeds to step 16. The control system relay 11a determines that the starter 8 cannot be automatically operated, that is, the starter automatic operation is abnormal. In subsequent step 17, the changeover switch 13 is switched to the key switch side contact 13a, and "manual operation" is performed by the key switch contact 10b. Since the starter 8 cannot be automatically operated, it is determined that the engine cannot be automatically restarted after the idle stop, and the engine 1 is prohibited from being idle stopped in step 18.

  On the other hand, if the battery voltage VB is equal to or lower than the predetermined voltage V1 after the predetermined time T2 from the time t2 when the operation of the starter 8 is switched from the manual operation to the automatic operation in Step 6, the “automatic operation” of the starter 8 is normally performed. The process proceeds to step 7. In step 7, it is confirmed whether or not the engine speed Ne detected by the engine speed sensor 20 is equal to or higher than a predetermined speed N1. A rotation speed at which it can be determined that the engine 1 is rotating in the complete explosion state is set as the predetermined speed N1.

  If the engine speed Ne is equal to or higher than the complete explosion determination speed N1, the process proceeds to step 8 and waits until the key switch contacts 10a, 10b are turned off. When the key switch contacts 10a, 10b are turned off, it is determined that the occupant has turned off the ignition key, and the routine proceeds to step 9 where the timer 12d for measuring the key switch on time Ton is cleared. Next, at step 10, the idle stop relay contact 11a is turned off (opened). Thereby, the energization to the starter relay coil 9b is cut off and the starter relay contact 9a is turned off (opened), so that the energization from the 14V battery 6 to the starter 8 is also cut off.

  When the key switch contacts 10a and 10b are turned off after the engine is completely exploded (step 8), the idle stop relay contact 11a is turned off (step 10), the starter 8 is stopped and the cranking of the engine 1 is finished. Actually, although the starter 8 is switched from “manual operation” to “automatic operation” during the engine start, the occupant is in the “manual operation” of the starter 8 by the ignition key operation when the engine 1 is initially started. It is recognized that the operation has been performed, and an operation feeling similar to that of the engine start by the conventional ignition key operation is obtained.

  During the initial start of the engine 1, the starter 8 is switched from “manual operation” to “automatic operation”, and the starter 8 is “automatically stopped” by the controller 12 after the engine complete explosion. Since the starter 8 is automatically stopped when the engine is restarted after the idle stop, it is necessary to diagnose whether the starter can be normally stopped when the engine is manually started at the beginning of vehicle operation.

  In step 11, the automatic stop of the starter 8 is diagnosed. That is, it is confirmed whether or not the battery voltage VB detected by the voltage sensor 21 is equal to or higher than the predetermined voltage V2 after the predetermined time T3 from the time t3 when the starter 8 is "automatically stopped" by turning off (opening) the idle stop relay contact 11a. (See time t3 + T3 in FIG. 4).

  Here, when the idle stop relay contact 11a is turned off and the power supply from the 14V battery 6 to the starter 8 is cut off, the battery voltage VB is recovered and the starter 8 is stopped. An appropriate battery voltage that can be confirmed may be set. In this embodiment, the battery voltage VB is compared with the predetermined voltage V2 to determine whether or not the automatic stop of the starter 8 is normal. However, the recovery amount of the battery voltage VB or the current flowing through the battery 6 is shown. Based on the above, it may be determined whether the automatic starter stop is normal.

  When the battery voltage VB is lower than the predetermined voltage V2, that is, although the idle stop relay contact 11a is turned off and the power supply from the 14V battery 6 to the starter 8 is cut off, the voltage VB of the 14V battery 6 is recovered. If not, or if the recovery amount is small, the routine proceeds to step 13 where it is determined that the starter 8 cannot be automatically stopped by the idle stop relay contact 11a, that is, the starter automatic stop abnormality. In subsequent step 14, the changeover switch 13 is switched to the key switch side contact 13a, and "manual stop" is performed by the key switch contact 10b. Since the starter 8 cannot be automatically stopped, it is determined that the engine cannot be automatically restarted after the idle stop. In step 15, the idle stop is prohibited.

  On the other hand, if the battery voltage VB is greater than or equal to the predetermined voltage V2 after a predetermined time T3 from the time t2 when the starter 8 is stopped in step 11, the process proceeds to step 12 and it is determined that the “automatic stop” of the starter 8 has been performed normally Then, the idle stop is permitted and the process is terminated. In this case, the changeover switch 13 remains at the idle stop relay side contact 13b. When the idling stop is permitted, when the engine is restarted after the idling stop, the starter 8 is operated and stopped by opening and closing the idling stop relay contact 11a, and the engine 1 is started.

  By the way, the ignition key may be turned off immediately after the start of the engine by the ignition key. Such an operation is called “immediate cutting” of the ignition key. Turning off the ignition key when the engine has not reached the complete explosion state determines that the occupant does not intend to start the engine. In this case, the starter 8 is changed from “manual operation” to “automatic operation” by the controller 12. Without switching, urge the occupant to re-operate the ignition key.

  FIG. 3 is a flowchart showing the ignition key immediate cutting process. The CPU 12a of the controller 12 is interrupted every predetermined time, for example, every 10 msec, and processing for an instant key turning operation is executed.

  In step 21, it is confirmed whether or not it is determined that the engine 1 is in a complete explosion state. If it is already determined in step 7 of FIG. 2 that the engine 1 is in the complete explosion state, there is no problem even if the ignition key is turned off, and the process is terminated. When it is not determined that the engine 1 is in the complete explosion state, the routine proceeds to step 22 where it is confirmed whether or not the key switch contacts 10a and 10b are turned off. If the key switch contacts 10a and 10b are not turned off, the process is terminated. If the key switch contacts 10a and 10b are turned off, it is determined that the ignition key has been immediately turned off, and the process proceeds to step 23.

  If the ignition key is turned off before the complete explosion determination, in step 23, the changeover switch 13 is switched to the key switch side contact 13a and the idle stop relay 11a is turned off. Thereby, the power supply of the starter 8 is interrupted and the start of the engine 1 is interrupted. Therefore, similarly to the conventional engine starter, the engine start is interrupted when the ignition key is immediately turned off.

Thus, in the above-described embodiment, the starter 8 for starting the engine, the battery 6 for supplying power to the starter 8, and the key that is turned on (closed) when the ignition key is set to the engine start position. Switches 10a and 10b, idle stop relays 11a and 11b for starting and stopping the starter 8 during idle stop, and manual operation circuits 13a, 10b, 14 for supplying power from the battery 6 to the starter 8 through the key switch 10b 9a, 9b, automatic operation circuits 13b, 11a, 15, 9a, 9b for supplying power from the battery 6 to the starter 8 via the idle stop relay 11a, cutting off the supply of power via the manual operation circuit, and the key When the switches 10a and 10b are turned on (closed), the star is operated by the manual operation circuit Drove over 8 continues and a controller 12 for driving the starter 8 by automatic operation circuit in place of the manual operation circuit after a predetermined time has elapsed.
As a result, when starting the engine by the ignition key operation of the occupant at the beginning of vehicle operation, the engine is started using the automatic starter circuit for restarting the engine after idle stop. Even if the starter cannot be operated due to some abnormality in the driving circuit, it is possible to recognize the inability to drive when the vehicle starts, and only when the engine is restarted after an idle stop while the vehicle is operating There is nothing. That is, the operation diagnosis of the starter automatic operation circuit is performed when the engine is started by the ignition key operation of the occupant at the beginning of vehicle operation, and the reliability of the apparatus can be improved.

  According to one embodiment, the voltage sensor 21 for detecting the voltage VB of the battery 6 and the manual operation circuits 13a, 10b, 14, 9a, 9b are switched to the automatic operation circuits 13b, 11a, 15, 9a, 9b. When the battery voltage VB detected by the voltage sensor 21 is not equal to or lower than the preset voltage V1 after a predetermined time has elapsed, the controller 12 for diagnosing starter operation abnormality by the automatic operation circuit is provided. When a starter operation abnormality (automatic operation abnormality) is diagnosed, the automatic operation circuit is switched to the manual operation circuit, and idle stop is prohibited, so when the engine is started by the ignition key operation of the occupant at the beginning of vehicle operation For restarting the engine after an idle stop Can be reliably diagnosed terpolymers automatic operation circuit, it is possible to improve the reliability of the device. In addition, when the starter operation abnormality is diagnosed as a result of the diagnosis, the idle stop is prohibited, so that it is possible to avoid a situation where the engine cannot be started when the engine is restarted after the idle stop in the middle of the vehicle operation. .

  According to one embodiment, complete explosion detection circuits 20 and 12 for detecting the complete explosion state of the engine are provided, and when the complete explosion state is detected by the controller 12 and the key switches 10a and 10b are turned off, the idle state is detected. Since the stop relays 11a and 11b are turned off to cut off the power supply to the starter 8 by the automatic operation circuits 13b, 11a, 15, 9a and 9b, when the engine is started by operating the ignition key of the occupant at the beginning of vehicle operation The starter will be stopped using an automatic driving circuit for restarting the engine after an idle stop, and even if there is something wrong with the automatic driving circuit and the starter cannot be stopped, It is possible to recognize that the starter cannot be stopped automatically at the beginning of operation and restart the engine after an idle stop during vehicle operation. There is no such thing as the first time notice starter automatic stop non-turned. That is, the operation diagnosis of the automatic operation circuit is performed at the time of engine start by the ignition key operation of the occupant at the beginning of vehicle operation, and the reliability of the apparatus can be improved.

  According to one embodiment, the controller 12 presets the battery voltage VB detected by the voltage sensor 21 a predetermined time after the idle stop relays 11a and 11b are turned off and the power supply to the starter 8 is cut off. When the voltage V2 is not higher than the detected voltage V2, the starter stop abnormality is diagnosed by the automatic operation circuits 13b, 11a, 15, 9a, 9b, and when the starter stop abnormality is diagnosed, the automatic operation circuit is switched to the manual operation circuit. At the same time, since idling stop is prohibited, the starter automatic operation circuit for restarting the engine after idling stop can be surely diagnosed when starting the engine by the ignition key operation of the occupant at the beginning of vehicle operation And the reliability of the apparatus can be improved. Further, when the starter stop abnormality is diagnosed as a result of the diagnosis, the idle stop is prohibited, so that it is possible to avoid a situation in which the starter stop cannot be performed when the engine is restarted after the idle stop during the vehicle operation.

  Furthermore, according to one embodiment, the controller 12 switches from the automatic operation circuit to the manual operation circuit when the key switch 10a, 10b is turned off when the complete explosion state is not detected, and the idle stop Since the relays 11a and 11b are turned off, the engine start is not continued by the starter automatic operation circuit even if the occupant's ignition key is operated “immediately cut”. In the same way, it does not give the passengers a feeling of strangeness.

  The correspondence between the constituent elements of the claims and the constituent elements of the embodiment is as follows. That is, the key switch side contact 13a, the key switch 10b, the diode 14 and the starter relays 9a and 9b are manual operation circuits, and the idle stop relay side contact 13b, the idle stop relay 11a, the diode 15 and the starter relays 9a and 9b are automatic operation circuits. The controller 12 constitutes a control circuit and a diagnostic circuit, the voltage sensor 21 constitutes a voltage detection circuit, and the engine rotation sensor 20 and the controller 12 constitute a complete explosion detection circuit. In addition, unless the characteristic function of this invention is impaired, each component is not limited to the said structure.

  In the configuration of the embodiment described above, an example is shown in which power is supplied from the 14V battery 6 to a power system such as the motor generator 2 and power is supplied from the same 14V battery 6 to a control system such as the controller 12. The power may be supplied to the power system and the control system from separate batteries.

  In this embodiment, a hybrid vehicle using the engine 1 and / or the motor generator 2 as a travel drive source will be described as an example, but the present invention is also applicable to a normal engine vehicle that does not include the inverter 7 and the motor generator 2. The present invention can be applied.

  Furthermore, in the above-described embodiment, an example in which the engine is determined to be in the complete explosion state when the engine rotation speed Ne is equal to or higher than the complete explosion determination speed N1 has been described. The determination is not limited to the embodiment, and the determination may be made based on the pressure in the intake pipe of the engine.

It is a figure which shows the structure of one embodiment. It is a flowchart which shows the engine starting control of one Embodiment. It is a flowchart which shows an ignition key quick cut process. It is a time chart which shows the engine starting operation | movement of one Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Motor generator 3 Belt mechanism 4 Transmission 5a, 5b Drive wheel 6 14V battery 7 Inverter 8 Starter 9a Starter relay contact 9b Starter relay coil 10a, 10b Key switch contact 11a Idle stop relay contact 11b Idle stop relay coil 12 Controller 12a CPU
12b Memory 12c A / D converter 12d Timer 13 Changeover switch 13a Key switch side contact 13b Idle stop relay side contact 14, 15 Diode 16 Vehicle speed sensor 17 Accelerator sensor 18 Brake hydraulic pressure sensor 19 Shift position sensor 20 Engine rotation sensor 21 Voltage sensor

Claims (5)

A starter to start the engine,
A battery for supplying power to the starter;
A key switch that is turned on (closed) when the ignition key is set to the engine start position;
An idle stop relay that operates and stops the starter during idle stop;
A manual operation circuit for supplying power from the battery to the starter via the key switch;
An automatic operation circuit that cuts off the supply of electric power through the manual operation circuit and supplies electric power from the battery to the starter via the idle stop relay;
A control circuit that operates the starter by the manual operation circuit when the key switch is turned on (closed), and continuously operates the starter by the automatic operation circuit instead of the manual operation circuit after a predetermined time has elapsed. An engine starter for an idle stop vehicle. The engine start device for an idle stop vehicle according to claim 1,
A voltage detection circuit for detecting the voltage of the battery;
If the battery voltage detected by the voltage detection circuit is not less than or equal to a preset voltage after a predetermined time since the manual operation circuit is switched to the automatic operation circuit, the starter operation abnormality is diagnosed by the automatic operation circuit. And a diagnostic circuit for
An engine starter for an idle stop vehicle, wherein the control circuit switches from the automatic operation circuit to the manual operation circuit and prohibits an idle stop when the diagnosis circuit diagnoses a starter operation abnormality. The engine starting device for an idle stop vehicle according to claim 2,
It has a complete explosion detection circuit that detects the complete explosion status of the engine.
When the complete explosion state is detected by the complete explosion detection circuit and the key switch is turned off, the control circuit turns off the idle stop relay and cuts off the power supply to the starter by the automatic operation circuit. An engine starter for an idle stop vehicle. The engine start device for an idle stop vehicle according to claim 3,
When the battery voltage detected by the voltage detection circuit is not equal to or higher than a preset voltage after a predetermined time after the idle stop relay is turned off and the power supply to the starter is cut off, Diagnose the starter stop abnormality by the automatic operation circuit,
An engine starter for an idle stop vehicle, wherein the control circuit switches from the automatic operation circuit to the manual operation circuit and prohibits an idle stop when the diagnosis circuit diagnoses a starter stop abnormality. The engine starting device for an idle stop vehicle according to claim 3 or 4,
The control circuit switches from the automatic operation circuit to the manual operation circuit when the key switch is turned off when the complete explosion state is not detected by the complete explosion detection circuit, and the idle stop relay is turned on. An engine starter for an idle stop vehicle characterized by being turned off.

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