JP2006291713A - Starter control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a starter control device preventing wrong operation of a starter motor. <P>SOLUTION: An idling stop control ECU 10 determines whether an engine stop condition is satisfied or not, and drives the starter motor 31 to start an engine when the engine stop condition is not satisfied. An engine control ECU 20 determines whether an operation permission condition of the idling stop control ECU 10 is satisfied or not, stops power supply to the EUC 10 until the operation permission condition of the ECU 10 is established and supplies power to the EUC 10 to operate the ECU 10 when the operation permission condition of the ECU 10 is established. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an on-vehicle electronic control unit (ECU), and relates to a starter control device for performing idle stop control.

In order to reduce the power consumption of a vehicle, there is a technique for stopping power supply to a control device during an idle stop (Patent Document 1).
JP 2004-137905 A

However, when a control device (for example, an idle stop ECU) breaks down, a drive unit (for example, a starter motor) may malfunction.
The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a starter control device capable of preventing malfunction of a starter motor.

  According to a first aspect of the present invention, there is provided an electronic control device for idle stop control for determining whether or not an engine stop condition is satisfied and driving a starter motor to start the engine when the engine stop condition is not satisfied, and the idle It is determined whether or not the operation permission condition for the electronic control device for stop control is satisfied, and power supply to the electronic control device for idle stop control is stopped until the operation permission condition for the electronic control device for idle stop control is satisfied And an electronic control device for power supply control that supplies power to the electronic control device for idle stop control to operate the electronic control device for idle stop control when the operation permission condition of the electronic control device for idle stop control is satisfied. It is characterized by that. Therefore, the electronic control device for power control determines whether or not the operation permission condition for the electronic control device for idle stop control is satisfied, and idle stop control until the operation permission condition for the electronic control device for idle stop control is satisfied. When the power supply to the electronic control device for the vehicle is stopped and the operation permission condition of the electronic control device for the idle stop control is satisfied, the power is supplied to the electronic control device for the idle stop control to operate the electronic control device for the idle stop control. As a result, it is possible to prevent malfunction of the starter motor due to failure of the electronic control device for idle stop control, and to improve fuel efficiency due to reduction in power consumption.

  According to a second aspect of the present invention, there is provided an idle stop control electronic control device for driving a starter motor to start the engine when it is determined whether or not the engine stop condition is satisfied and the engine stop condition is not satisfied. It is determined whether or not the start is completed, and power is supplied to the idle stop control electronic control unit to operate the idle stop control electronic control unit until the engine start is completed. And a power control electronic control device for stopping power supply to the idle stop control electronic control device. Therefore, the electronic control device for power supply control determines whether or not the engine start is completed, and the electronic control device for idle stop control is operated to operate the idle stop control electronic control device until the engine start is completed. When power is supplied and engine start is completed, the power supply to the idle stop control electronic control unit is stopped. Thereby, it is possible to prevent the starter motor from continuously operating due to a failure of the electronic control device for idle stop control.

  According to a third aspect of the present invention, there is provided an idle stop control electronic control device for driving a starter motor to start the engine when the engine stop condition is not satisfied by determining whether or not the engine stop condition is satisfied, and the idle It is determined whether or not the operation permission condition for the electronic control device for stop control is satisfied, and power supply to the electronic control device for idle stop control is stopped until the operation permission condition for the electronic control device for idle stop control is satisfied When the operation permission condition for the idle stop control electronic control device is satisfied, power is supplied to the idle stop control electronic control device to operate the idle stop control electronic control device, and whether or not the engine has been started. When the engine start is completed, the electronic control unit for idle stop control It is characterized a power control electronic control device for stopping the source supply, further comprising a. Therefore, the electronic control device for power control determines whether or not the operation permission condition for the electronic control device for idle stop control is satisfied, and idle stop control until the operation permission condition for the electronic control device for idle stop control is satisfied. The power supply to the electronic control device for the engine is stopped, and when the operation permission condition of the electronic control device for the idle stop control is satisfied, the power is supplied to the electronic control device for the idle stop control to operate the electronic control device for the idle stop control, Further, it is determined whether or not the engine has been started. When the engine has been started, the power supply to the idle stop control electronic control unit is stopped. As a result, it is possible to prevent malfunction of the starter motor due to failure of the electronic control device for idle stop control, and to improve fuel efficiency due to reduction in power consumption.

  In the invention according to claim 1 or 3, when the operation permission condition of the electronic control device for idle stop control is satisfied, as described in claim 4, even if the vehicle speed becomes smaller than a predetermined speed. Even if the engine temperature state exceeds a predetermined level as described in claim 5, or even if the battery charge state exceeds a predetermined level as described in claim 6, Even if the engine speed is smaller than a predetermined speed as described in Item 7, or the road slope is smaller than a predetermined value as described in Claim 8, According to a ninth aspect of the present invention, the temperature of the catalyst installed in the exhaust pipe of the engine may be equal to or higher than a predetermined value, and in this way, the operation time of the electronic control device for idle stop control can be suppressed. ,Claim Effect of the invention described in 1 or 3 is more obtained.

  According to a tenth aspect of the present invention, there is provided an idle stop control electronic control device that drives a starter motor to start the engine when it is determined whether or not the engine stop condition is satisfied and the engine stop condition is not satisfied. After the start of the engine is completed by the operation of the idle stop control electronic control device by supplying power to the stop control electronic control device, the power supply to the idle stop control electronic control device is continued until a predetermined condition is satisfied. And an electronic control device for power control that stops. Therefore, the electronic control device for power control controls the idle stop until a predetermined condition is satisfied after the start of the engine is completed by the operation of the electronic control device for idle stop control by supplying power to the electronic control device for idle stop control. The power supply to the control electronic control unit is stopped. As a result, it is possible to prevent malfunction of the starter motor due to failure of the electronic control device for idle stop control, and to improve fuel efficiency due to reduction in power consumption.

  In the invention according to claim 10, until the predetermined condition is satisfied after the start of the engine is completed, even if the predetermined time elapses as in claim 11, As described in the above, it may be until the charge state of the battery exceeds a predetermined level, or until the vehicle travels a predetermined distance as described in claim 13. The operation time of the electronic control device for control can be suppressed, and the effect of the invention of claim 10 can be further obtained.

  According to a fourteenth aspect of the present invention, in the starter control device according to the second or third aspect, when the power supply control electronic control unit detects that the engine has been started, information indicating that the engine has been started. Is sent to the idle stop control electronic control unit, and the idle stop control electronic control unit stops the starter motor when it detects that the start of the engine is completed based on the information. In this way, the starter motor can be stopped even when a device (such as a relay) that supplies / stops power to the electronic control device for idle stop control breaks down.

  In the starter control device according to any one of claims 1 to 14, when the driving of the power control electronic control device is stopped, the power supply to the idle stop control electronic control device is performed. When stopped, the starter motor can be surely stopped even when the power control electronic control device fails.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows a system configuration diagram (configuration diagram of an idle stop control system) of a starter control device according to the present embodiment.

  This system includes a battery 1, an electronic control device for idle stop control (hereinafter referred to as an idle stop control ECU) 10, an electronic control device for engine control (hereinafter referred to as an engine control ECU) 20, a starter 30, a relay 40, and an engine rotation sensor. 50. These are all mounted on vehicles equipped with engines. The starter 30 is driven by the idle stop control ECU 10. The engine control ECU 20 performs engine fuel injection control, ignition timing control, and the like.

  The idle stop control ECU 10 includes a CPU 11, a power supply IC 12, a CAN (control area network) driver 13, and a latch circuit 14. The engine control ECU 20 includes a CPU 21, a power supply IC 22, a CAN driver 23, a transistor 24, and a resistor 25. The starter 30 includes a starter motor 31, a relay switch 32, and a relay coil 33. The relay 40 includes a relay switch 41 and a relay coil 42.

  In the idle stop control ECU 10, the power supply IC 12 is connected to the positive terminal of the battery 1 via the relay switch 41 of the relay 40, and the power supply IC 12 generates a constant voltage Vcc (for example, 5 volts) from the battery voltage (for example, 12 volts). To the devices in the ECU 10 including the CPU 11. In the engine control ECU 20, the power supply IC 22 is connected to the plus terminal of the battery 1, and the power supply IC 22 generates a constant voltage Vcc (for example, 5 volts) from the battery voltage (for example, 12 volts) and includes the CPU 21 in the ECU 20. Supply to equipment.

  The CPU 11 of the idle stop control ECU 10 is connected to the communication line L1 via the CAN driver 13. Similarly, the CPU 21 of the engine control ECU 20 is connected to the communication line L <b> 1 via the CAN driver 23. Thereby, the CPU 11 of the idle stop control ECU 10 and the CPU 21 of the engine control ECU 20 are connected via the CAN drivers 13 and 23 and the communication line L1, and during control, the CAN 11 is connected between the idle stop control ECU 10 and the engine control ECU 20. Information is regularly exchanged by communication. The CPU 11 of the ECU 10 obtains driver information (brake, accelerator, steering), vehicle information (vehicle speed, inclination), and the like through CAN communication or the like. Further, the CPU 21 of the ECU 20 detects the engine speed based on a signal from the engine rotation sensor 50, and in addition, the cooling water temperature, the catalyst temperature, the remaining battery level, vehicle information (vehicle speed, inclination, travel distance), and cylinder discrimination are performed. It is possible to obtain information such as whether or not the engine is completed and whether or not the engine is in an idle state.

  In the idle stop control ECU 10, a latch circuit 14 is connected to the CPU 11. Specifically, the S terminal (set terminal) and the R terminal (reset terminal) of the latch circuit 14 are connected to the CPU 11. A relay coil 33 is connected to the O terminal (output terminal) of the latch circuit 14. When the relay coil 33 is energized, the relay switch 32 is closed and power (power supply) is supplied from the battery 1 to the starter motor 31 to drive the motor 31. Here, the starter motor 31 is also stopped by the latch circuit 14 when the battery voltage is lowered by the starter drive and falls below the CPU operating voltage (when the reset signal is output from the power supply IC 12 to the CPU 11 and the CPU 11 is reset). The driving is continued without doing. That is, the latch circuit 14 is provided for the purpose of low voltage operation, and the output is held in the latch circuit 14.

  The latch circuit 14 operates as shown in the truth table of FIG. 2. When the power supply of the idle stop control ECU 10 is stopped, the output (O terminal) is turned off, and when the power supply is started, the latch circuit 14 is turned off. It is supposed to work from the state.

  Regarding the NPN transistor 24 of the engine control ECU 20, the emitter terminal is grounded. The collector terminal of the NPN transistor 24 is connected to the plus terminal of the battery 1 via the relay coil 42. The base terminal of the NPN transistor 24 is grounded via a resistor 25 and is connected to the CPU 21. When the base voltage of the NPN transistor 24 is set to the H level by the CPU 21, the transistor 24 is turned on. When the transistor 24 is turned on, the relay coil 42 is energized, and the relay switch 41 is closed. Thereby, electric power (power supply) is supplied from the battery 1 to the power supply IC 12 of the idle stop control ECU 10. In this way, the engine control ECU 20 can control the power supply of the idle stop control ECU 10.

Next, the operation of the starter control device configured as described above will be described.
FIG. 3 is a flowchart showing an operation (process) of the idle stop control ECU 10, and shows an information reception process started every 1 ms.

In FIG. 3, the CPU 11 determines whether or not there is reception in step 100, and if there is reception, obtains reception information (start completion flag, idle stop permission information) in step 101.
In this manner, the presence / absence of reception is checked every 1 ms, and if received, reception information (start completion flag, idle stop permission information) is acquired.

FIG. 4 is a flowchart showing the operation (process) of the idle stop control ECU 10 and shows a process of starting every 10 ms.
In FIG. 4, the CPU 11 performs an operation mode process in step 200, further performs a starter control in step 210, further performs a latch circuit control in step 220, and then performs a transmission process (transmission of an engine stop instruction or the like in step 230). ). Details of the operation mode processing in step 200 are shown in FIG.

  In FIG. 5, the CPU 11 establishes the conditions of the engine control ECU 20 in steps 201 to 206 (idle stop is permitted), the brake is on, the accelerator is closed, the steering is straight, and If the vehicle speed is stopped and the road is in a flat state where the road is not inclined, the process proceeds to step 207, and the engine stop mode is set as the operation mode. On the other hand, the CPU 11 does not satisfy the conditions of the engine control ECU 20 in steps 201 to 206 (idle stop is prohibited), brakes off, accelerators / opens, steering turns, vehicle speed travels, or If the road is inclined, the process proceeds to step 208, and the engine run mode is set as the operation mode.

  Thus, the operation mode (engine stop or run) is determined from the information (idle stop permission information) of the engine control ECU 20, the driver information (brake, accelerator, steering), and the vehicle information (vehicle speed, inclination). This operation mode (stop or run) is sent as a transmission message to the engine control ECU 20 every 10 ms in step 230 of FIG. That is, when the operation mode is stopped, the CPU 11 sends an engine stop instruction (the operation mode is run when there is no engine stop instruction) as a transmission message every 10 ms.

FIG. 6 shows details of the starter control process in step 210 of FIG. 4, and FIG. 7 shows details of the latch circuit control process in step 220 of FIG.
In FIG. 6, when the operation mode is switched from stop to run while the starter is off in steps 211 and 212, the CPU 11 sets the count value of the timer to “0” and sets the starter on in steps 213 and 214. The CPU 11 does not perform the processing of steps 213 and 214 unless the operation mode is switched from stop to run in step 212.

  In FIG. 7, the CPU 11 determines in step 221 whether the starter is on or off. If the starter is on in step 214 in FIG. 6, if the previous starter value is off in step 226, the CPU 11 latches in step 227. The S output to the circuit 14 is set to the H level and the R output is set to the L level. Thereafter, in step 224, the current starter value is set as the previous starter value for the next processing. By such processing, when the starter instruction transitions from OFF to ON, the latch circuit 14 is set to S terminal = H and R terminal = L, and thereby the O terminal = ON (see FIG. 2). As a result, the relay coil 33 in FIG. 1 is energized, the relay switch 32 is closed, and the starter motor 31 is energized (starter driving is started).

  In the next processing, since the CPU 11 is turned on at step 211 in FIG. 6, if the start completion flag obtained by communication with the engine control ECU 20 is off at step 215 and the timer is less than 500 ms at step 216, step 217 is performed. Add the timer value by 10 ms. Further, the CPU 11 shifts from step 221 to 226 to 225 in FIG. 7, and at step 225, the S output to the latch circuit 14 is set to the L level and the R output is set to the L level. As a result, the latch circuit 14 is set to S terminal = L and R terminal = L, thereby setting the O terminal = hold (see FIG. 2).

  On the other hand, in FIG. 6, the CPU 11 repeats steps 211 → 215 → 216 → 217 every 10 ms, and when the start completion flag is turned on in steps 215 and 216 or the timer reaches 500 ms, the starter is turned off in step 218. To do. Then, in FIG. 7, if the CPU 11 determines whether the starter is on or off in step 221 and the starter is off by the processing of step 218 in FIG. In step S223, the S output to the latch circuit 14 is set to the L level and the R output is set to the H level, and then the processing in step 224 is performed. As a result, when the starter instruction changes from on to off, the latch circuit 14 is set to S terminal = L and R terminal = H, thereby turning off the O terminal (see FIG. 2). As a result, the relay coil 33 in FIG. 1 is de-energized, the relay switch 32 is opened, and the energization of the starter motor 31 is interrupted (the starter is stopped).

  Then, in the next processing, the CPU 11 proceeds from step 221 to 222 to 225 in FIG. 7, and at step 225, the S output to the latch circuit 14 is set to the L level and the R output is set to the L level, and then the processing of step 224 is performed. . As a result, the latch circuit 14 is set to S terminal = L and R terminal = L, thereby setting the O terminal = hold (see FIG. 2).

In this way, the CPU 11 sets the S output / R output to the latch circuit 14 to the H level for 10 ms (one processing cycle) at the time of the transition of the starter instruction, and immediately returns it to the L level.
By the processing of FIGS. 6 and 7, the starter is turned on at the transition from the stop of the operation mode to the run (starting of driving of the starter motor 31), and the start completion flag obtained by communication with the engine control ECU 20 is set. The starter motor 31 is continuously driven for 500 ms (turned on (meaning that the engine speed is 800 rpm or more)), and then the starter is turned off (the drive of the starter motor 31 is stopped).

FIG. 8 is a flowchart showing an operation (process) of the engine control ECU 20, and shows an information reception process started every 1 ms.
In FIG. 8, the CPU 21 determines whether there is reception in step 300. And if there exists reception, CPU21 will acquire reception information (information, such as an engine stop instruction | indication) in step 301. FIG. On the other hand, if there is no reception in step 300, the CPU 21 does not perform the processing in step 301.

In this way, the presence / absence of reception is checked every 1 ms, and if received, reception information (information such as an engine stop instruction) is acquired.
FIG. 9 is a flowchart showing the operation (process) of the engine control ECU 20, and shows a process activated every 10 ms.

  In FIG. 9, the CPU 21 performs an idle stop condition process in step 400, further performs a fuel cut determination in step 410, further performs an ignition cut determination in step 420, performs a start completion determination in step 430, and then performs step Power supply cut control is performed at 440, watchdog clear output control is performed at step 450, and transmission processing (transmission of information such as a start completion flag and idle stop permission) is executed at step 460. Details of the idle stop condition processing in step 400 are shown in FIG.

  In FIG. 10, the CPU 21 determines in step 401 whether or not the start completion flag has been turned on from off, and when the start completion flag has been turned on from off, the travel distance = 0 is set in step 402. The CPU 21 does not perform the process of step 402 except when the start completion flag is turned on from off in step 401. In step 403, the CPU 21 determines whether or not the travel distance has reached 500 m after completion of the engine start. In steps 403 to 409, the CPU 21 has reached a travel distance of 500 m after the completion of engine start, the engine speed is less than 1000 rpm, the engine cooling water temperature is 90 ° C. or more (after warming up), and the catalyst If the temperature is 500 ° C. or higher, the remaining battery level is 90% or higher, the vehicle speed is less than a predetermined value, and the road slope is less than a predetermined value, the process proceeds to step 410 and the idle stop permission mode is set. To do. Thereafter, the CPU 21 turns off the start completion flag in step 411.

  On the other hand, in steps 403 to 409, the CPU 21 does not reach the travel distance of 500 m if the engine start is completed, the engine speed is greater than 1000 rpm, or the engine cooling water temperature is lower than 90 ° C. (while warming up) Alternatively, if the catalyst temperature is lower than 500 ° C., the remaining battery level is less than 90%, the vehicle speed is equal to or higher than a predetermined value, or the slope of the road surface is higher than a predetermined value, the routine proceeds to step 412 and idle stop Set the prohibit mode.

  As described above, the engine conditions (engine speed, cooling water temperature), emission conditions (catalyst temperature), battery conditions (remaining battery level), vehicle information (vehicle speed, inclination), and start completion flag are switched from OFF to ON. Based on the distance traveled later, it is determined whether or not idle stop is permitted.

Details of the fuel cut determination in step 410 of FIG. 9 are shown in FIG.
In FIG. 11, if the CPU 21 is not instructed to stop the engine in steps 411 to 414, the engine speed is less than 7000 rpm, the engine is in the idle state, and the engine speed is less than the fuel cut speed NCUT, the process proceeds to step 415. To turn off the fuel cut (no fuel cut). If the CPU 21 is not in the idle state in step 413, the process proceeds to step 415 without performing the process in step 414.

  Here, the fuel cut rotation speed NCUT used in step 414 is a value corresponding to the engine coolant temperature, and is determined in advance as shown in detail in FIG. 12 (FIG. 12 shows the fuel cut rotation corresponding to the coolant temperature). Number NCUT).

  In FIG. 11, if the CPU 21 is instructed to stop the engine in steps 411 to 414, the engine speed is 7000 rpm or higher, or the engine speed in the idle state is higher than the fuel cut speed NCUT, step 416. To turn on the fuel cut (perform fuel cut).

Thus, in addition to the overrun cut and the deceleration cut, the fuel is cut when the engine stop instruction is given, and the engine is stopped.
Details of the fuel cut determination at step 420 in FIG. 9 are shown in FIG.

  In FIG. 13, the CPU 21 performs ignition output at step 422 (normal ignition is performed) when the operation mode is run at step 421, that is, when there is no engine stop instruction. On the other hand, if the operation mode is stopped in step 421, that is, if there is an engine stop instruction, the CPU 21 proceeds to step 423 and cuts off ignition (stops ignition).

Thus, the ignition output / fuel cut is performed based on the presence / absence of the engine stop instruction, that is, the operation mode (run or stop).
FIG. 14 shows details of the start completion determination in step 430 of FIG.

  In FIG. 14, if there is an instruction to stop the engine in steps 431 to 433, the engine speed is less than the idle speed (800 rpm), or the cylinder discrimination is incomplete, the process proceeds to step 435. Turn off the start completion flag. On the other hand, if there is no engine stop instruction in steps 431 to 433, the engine speed is equal to or higher than the idle speed (800 rpm), and the cylinder discrimination is completed, the CPU 21 proceeds to step 434 and starts the engine. If the start complete flag is turned on.

Details of the power cut control in step 440 of FIG. 9 are shown in FIG.
In FIG. 15, the CPU 21 determines in step 441 whether or not idle stop is permitted, and in step 442 determines whether or not the start completion flag is off. If the idle stop is permitted and the start completion flag is off, the CPU 21 proceeds to step 443 and supplies power to the idle stop control ECU 10. Specifically, the transistor 24 of FIG. 1 is turned on, the relay coil 42 is energized, the relay switch 41 is closed, and power is supplied to the ECU 10. On the other hand, if the idle stop is prohibited at step 441 in FIG. 15 or the start completion flag is turned on at step 442, the CPU 21 stops (cuts off) the power supply to the idle stop control ECU 10 at step 444. Specifically, the transistor 24 in FIG. 1 is turned off, the relay coil 42 is deenergized, the relay switch 41 is opened, and the power supply to the ECU 10 is stopped. In this way, when the idle stop is prohibited or the start completion flag is on, the power supply to the idle stop control ECU 10 is stopped. When the power supply is stopped, the output of the latch circuit 14 is turned off (see FIG. 2), the relay switch 32 is opened, and the starter motor 31 is stopped.

  Here, when the start completion flag is turned from OFF to ON in step 434 in FIG. 14, the travel distance = 0 is set in step 401 → 402 in FIG. 10, and the idle stop = prohibition is shifted from step 403 → 412. The In the subsequent processing, the process proceeds from step 401 to 403, and when the travel distance reaches 500 m, after steps 404 to 409, the idle stop is permitted and the start completion flag is turned off in steps 410 to 411. With this idle stop = permission and the start completion flag = off, supply of power to the idle stop control ECU 10 is started in step 443 in FIG.

Details of the watchdog clear output control in step 450 of FIG. 9 are shown in FIG.
In FIG. 16, if the previous watchdog clear output for the power supply IC 22 is at L level in step 451, the CPU 21 sets the watchdog clear output to H level in step 452. On the other hand, if the previous watchdog clear output is at the H level in step 451, the CPU 21 sets the watchdog clear output to the L level in step 453. In this way, the watchdog clear signal is inverted and output every 10 ms to inform the power supply IC 22 that it is operating correctly. Thereby, the count operation of the watchdog timer is reset in the power supply IC 22 at the falling edge of the watchdog clear signal.

The following operations are performed by executing the processes of FIGS. 3 to 16 (the operation of the entire system will be described with reference to the time chart of FIG. 17).
In FIG. 17, the idle stop is permitted from the idle stop prohibited state at the timing t1 (becomes the idle stop permitted state), and the engine is stopped at the timing t2 (the engine is stopped). Subsequently, from this state, engine start is started at a timing t3 (enters an engine start start state), and further, engine start is completed at a timing t4 (enters an engine start completion state).

  The idle stop control ECU 10 and the engine control ECU 20 perform CAN communication, and transmit and receive information on idle stop permission / prohibition, engine start completion, and engine stop instructions (injection and ignition stop / release). The engine control ECU 20 determines whether or not the idle stop prohibited state is changed to the idle stop permitted state by the processing of steps 401 → 403 to 409 in FIG. Then, when the permission condition is satisfied, the engine control ECU 20 sets the idle stop = permission at step 410 (t1 in FIG. 17), and the engine control ECU 20 supplies power to the idle stop control ECU 10 by the processing of steps 441 → 442 → 443 in FIG. To do.

  Then, the idle stop control ECU 10 determines whether or not to stop the engine by the processing of steps 201 to 206 in FIG. 5, and when it is determined to stop the engine in the idle stop permission state (step 207), FIG. In step 230, the engine control ECU 20 is instructed to stop the engine. When the engine control ECU 20 receives the engine stop instruction by the reception process of FIG. 8, the injection and ignition are stopped and the engine is stopped by the process of step 411 → 416 in FIG. 11 and step 421 → 423 in FIG. 13 (t2 in FIG. 17). ). That is, when the idle stop permission state is changed to the engine stop mode, the engine control ECU 20 stops ignition and injection by the processes of FIGS. 11 and 13 to stop the engine.

  Thereafter, the idle stop control ECU 10 determines whether or not the engine is in a state to be started by the processing of steps 201 to 206 in FIG. To do. Thus, when the engine stop state is changed to the engine run mode (engine start start mode), the engine control ECU 20 releases the stop of ignition and injection by the processes of FIGS. 8, 11 and 13 (steps 415 and FIG. 13 in FIG. 11). ), The idle stop control ECU 10 turns on the starter at step 214 in FIG. 6 (t3 in FIG. 17). When this starter is turned on, driving of the starter is started by the processing in step 227 and the like in FIG.

  When the engine control ECU 20 determines that the engine has been started by the processing of steps 431 to 433 in FIG. 14, the engine completion ECU is turned on in step 434 (t4 in FIG. 17). Accordingly, the power supply to the idle stop control ECU 10 is stopped in steps 441 → 442 → 444 in FIG. 15 (the switch 41 of the relay 40 is opened, and the power supply to the idle stop control ECU 10 is stopped). As a result, the output of the latch circuit 14 is turned off (see FIG. 2), the relay switch 32 is opened, and the starter motor 31 is stopped. Further, when power is continuously supplied without operating the switch 41, the following occurs. In step 460 of FIG. 9, when the start completion flag ON information is sent from the engine control ECU 20 to the idle stop control ECU 10 as information indicating that the engine has been started, the idle stop control ECU 10 is started by the reception process of FIG. 3. When the completion information (start completion flag / on information) is received, the starter is turned off by the processing of steps 211 → 215 → 218 in FIG. 6, or when 500 ms elapses after the starter is turned on in step 216 in FIG. Transition to starter = off. When the starter is turned off in this way, the engine control ECU 10 causes the R output to the latch circuit 14 to become H level by the processing of steps 221 → 222 → 223 in FIG. 7, and the O terminal of the latch circuit 14 as shown in FIG. Is turned off and the starter motor 31 is stopped.

  As described above, the idle stop control ECU 10 is activated when the idle stop permission state is entered at t1 in FIG. 17 (the microcomputer register and latch circuit are initialized on the side where the starter is not energized), and the idle stop control ECU 10 is idle. In a state where the stop is impossible (idle stop prohibition state), the power supply to the idle stop control ECU 10 is stopped. As a result, when the idle stop is impossible, the starter does not malfunction due to a failure of the idle stop control ECU 10.

  Further, the engine control ECU 20 side performs engine start completion determination from information such as the engine speed, and when it is determined that the start is completed at t4 in FIG. 17, by stopping the power supply to the idle stop control ECU 10, Stop the starter. That is, when the engine start completion state is reached, the power supply to the idle stop control ECU 10 is stopped. Therefore, even when the idle stop control ECU 10 breaks down and the starter 30 tries to malfunction, the starter 30 can be stopped by stopping the power supply to the idle stop control ECU 10.

The operation when the idle stop control ECU 10 fails will be described in detail with reference to FIG.
FIG. 18 is a time chart of the engine state when the idle stop control ECU 10 fails. In FIG. 18, when the power supply control of the idle stop control ECU 10 is not performed, the idle stop control ECU 10 fails and the starter 30 is broken by a broken line in the figure. There is a possibility of malfunction. On the other hand, in this embodiment, since the power supply of the idle stop control ECU 10 is turned off, the starter 30 is not turned on.

  Thus, even if the idle stop control ECU 10 breaks down and the starter 30 tries to malfunction, it is possible to prevent the starter 30 from malfunctioning because the power supply to the idle stop control ECU 10 is stopped.

The operation when the relay 40 is always on due to the fixing of the switch 41 in the relay 40 of FIG. 1 will be described with reference to FIG.
In the time chart of FIG. 19, when the relay 40 is always turned on due to the fixing of the switch 41 or the like, the starter 30 cannot be turned off as indicated by the broken line in the figure. On the other hand, in the present embodiment, when the engine control ECU 20 detects the engine start by the process of FIG. 14, the start completion flag is turned on, and the engine control ECU 10 of the process of FIG. In step 218, the starter is turned off (or the starter is turned off when 500 ms elapses after the starter is turned on). With this starter = off, the engine control ECU 10 stops the starter motor 31 with the R output = H by the processing of step 223 in FIG. 7 (the idle stop control ECU 10 turns off the starter). Therefore, even if the switch 41 of the relay 40 is fixed and always closed, the starter motor 31 can be stopped when the engine is started.

  In this way, even when the relay 40 that controls the supply / stop of the power supply to the idle stop control ECU 10 breaks down (always on due to sticking or the like), the starter output can be stopped with the latch output R = H.

  In FIG. 17, the power supply to the idle stop control ECU 10 is stopped upon completion of engine start at t4, and the travel distance = 0 is set by the processing of steps 401 → 402 in FIG. Until the travel distance reaches 500 m, idling stop = prohibited in step 403 → 412. Accordingly, in FIG. 15, step 441 → 444, and the supply of power to the idling stop control ECU 10 is stopped. When the travel distance reaches 500 m at the timing of t5 in FIG. 17, the idle stop = permission and the start completion flag = off are set in steps 410 and 411 in FIG. As a result, steps 441 → 442 → 443 are performed in FIG. 15, and power is supplied to the idle stop control ECU 10.

  Further, the power supply IC 22 of the ECU 20 in FIG. 1 has a monitoring function of the CPU 21, and the CPU 21 is reset when a watchdog clear pulse is not output from the CPU 21 to the power supply IC 22 for a predetermined time. Thereby, when CPU21 of engine control ECU20 has stopped operation, CPU21 is reset by power supply IC22. As a result, the transistor 24 in FIG. 1 is turned off, the relay switch 41 is opened, and the power supply to the idle stop control ECU 10 can be reliably stopped. That is, when the engine control ECU 20 stops driving, the driving of the idle stop control ECU 10 can be stopped.

This embodiment has the following features.
(A) In the starter control device for performing the idle stop control, the idle stop control ECU 10 determines whether or not the engine stop condition is satisfied (steps 201 to 206 in FIG. 5) and does not satisfy the engine stop condition. (Step 208 in FIG. 5) The starter motor 31 is driven to start the engine (step 227 in FIG. 7). The engine control ECU 20 as the power control electronic control device determines whether or not the operation permission condition of the idle stop control ECU 10 is satisfied (steps 404 to 409 in FIG. 10), and the operation permission condition of the idle stop control ECU 10 is satisfied. Until this is done, power supply to the idle stop control ECU 10 is stopped (step 412 in FIG. 10, steps 441 and 444 in FIG. 15), and when the operation permission condition of the idle stop control ECU 10 is satisfied, the idle stop control ECU 10 is idled. Power is supplied to the stop control ECU 10 (step 410 in FIG. 10, steps 441 and 443 in FIG. 15). Therefore, it is possible to prevent the starter motor 31 from malfunctioning due to a failure of the idle stop control ECU 10 or the like, and it is possible to improve fuel efficiency due to a reduction in power consumption.

  (B) The engine control ECU 20 as the power control electronic control unit determines whether or not the engine start has been completed (steps 431 to 433 in FIG. 14), and the idle stop control ECU 10 until the engine start is completed. Power is supplied to the idle stop control ECU 10 (step 435 in FIG. 14 and steps 442 and 443 in FIG. 15), and when the engine starts, the power supply to the idle stop control ECU 10 is stopped (in FIG. 14). Step 434, Steps 442 and 444 in FIG. 15). Therefore, continuous operation of the starter motor 31 due to a failure of the idle stop control ECU 10 or the like can be prevented.

  (C) The engine control ECU 20 as an electronic control unit for power control determines whether or not the operation permission condition of the idle stop control ECU 10 is satisfied, and the idle stop control until the operation permission condition of the idle stop control ECU 10 is satisfied. The power supply to the ECU 10 is stopped (step 412 in FIG. 10, steps 441 and 444 in FIG. 15), and when the operation permission condition of the idle stop control ECU 10 is satisfied, the idle stop control ECU 10 is powered to operate the idle stop control ECU 10. (Step 410 in FIG. 10 and Steps 441 and 443 in FIG. 15). Further, it is determined whether or not the engine has been started. When the engine has been started, power supply to the idle stop control ECU 10 is stopped. (Step 434 in FIG. 14, FIG. 15 Step 442, 444). Therefore, it is possible to prevent the starter motor 31 from malfunctioning due to a failure of the idle stop control ECU 10 or the like, and it is possible to improve fuel efficiency due to a reduction in power consumption.

(D) In the above (a) or (c), the fact that the operation permission condition of the idle stop control electronic control device 10 is satisfied is specifically described as follows.
The vehicle speed is lower than the predetermined speed (step 408 in FIG. 10);
The engine temperature exceeds a predetermined level (step 405 in FIG. 10);
The charge state of the battery exceeds a predetermined level (step 407 in FIG. 10);
The engine speed is smaller than the predetermined speed (step 404 in FIG. 10);
The road slope becomes smaller than a predetermined value (step 409 in FIG. 10);
The temperature of the catalyst installed in the exhaust pipe of the engine becomes a predetermined value or higher (step 406 in FIG. 10).

Therefore, the operation time of the idle stop control ECU 10 can be suppressed, and the effect (A) or (C) can be further obtained.
Here, by monitoring that the charge state of the battery exceeds a predetermined level (step 407 in FIG. 10), the discharge of the battery can be suppressed. In addition, it is preferable to ensure the safety of the vehicle by monitoring that the slope of the road has become smaller than a predetermined value (step 409 in FIG. 10).

  In step 405 of FIG. 10, if the engine cooling water temperature is 90 ° C. or higher, it is determined that the engine temperature has exceeded a predetermined level, but if the outside air temperature is higher than the predetermined temperature instead of the engine cooling water temperature, or If the passenger compartment temperature is equal to or higher than a predetermined temperature, it may be determined that the engine temperature has exceeded a predetermined level.

  (E) The engine control ECU 20 as an electronic control device for power control controls the engine until the predetermined condition is satisfied after the start of the engine is completed by the operation of the idle stop control ECU 10 by supplying power to the idle stop control ECU 10 (FIG. 10 Steps 401, 402, 403) The power supply to the idle stop control ECU 10 is stopped (Step 412 in FIG. 10, Steps 441, 444 in FIG. 15). Therefore, it is possible to prevent the starter motor 31 from malfunctioning due to a failure of the idle stop control ECU 10 or the like, and it is possible to improve fuel efficiency due to a reduction in power consumption.

  Specifically, the time until the predetermined condition after the start of the engine is satisfied is until the vehicle travels a predetermined distance (steps 401, 402, and 403 in FIG. 10). Instead, the predetermined condition after the start of the engine is completed may be until the predetermined time elapses. Alternatively, until the predetermined condition after the start of the engine is completed may be until the charge state of the battery exceeds a predetermined level. Specifically, for example, based on the charge / discharge data from the control unit of the alternator, the charge state of the battery is detected, and the power supply to the idle stop control ECU 10 is stopped until a predetermined charge amount is reached. If it does in this way, the operation time of idle stop control ECU10 can be suppressed, and the effect of (e) is acquired more.

  (F) In the above (b) or (c), when the engine control ECU 20 detects that the engine has been started (steps 431 to 434 in FIG. 14), the information indicating that the engine has been started is idle. It is sent to the stop control ECU 10 (step 460 in FIG. 9), and the idle stop control ECU 10 stops the starter motor 31 (step 101 in FIG. 3, step 211 in FIG. 215, 218). In this way, the starter motor 31 can be stopped even when the relay 40 serving as a device for supplying / stopping power to the idle stop control ECU 10 fails.

  (G) Since the power supply to the idle stop control ECU 10 is stopped when the drive of the engine control ECU 20 is stopped, the starter motor 31 can be reliably stopped even when the engine control ECU 20 fails.

  Although the engine control ECU 20 is used as the power control electronic control device, an ECU (including a dedicated ECU) other than the engine control ECU may be used as the power control electronic control device.

The system block diagram in embodiment. Explanatory drawing which shows the truth value of a latch circuit. The flowchart which shows operation | movement (process) of idle stop control ECU. The flowchart which shows operation | movement (process) of idle stop control ECU. The flowchart which shows the operation mode process in idle stop control ECU. The flowchart which shows the starter control process in idle stop control ECU. The flowchart which shows the latch circuit control processing in idle stop control ECU. The flowchart which shows operation | movement (process) of engine control ECU. The flowchart which shows operation | movement (process) of engine control ECU. The flowchart which shows the idle stop condition process in engine control ECU. The flowchart which shows the fuel cut determination process in engine control ECU. Explanatory drawing which shows the fuel cut rotation speed corresponding to a cooling water temperature. The flowchart which shows the ignition cut determination in engine control ECU. The flowchart which shows the start completion determination in engine control ECU. The flowchart which shows the power-supply-cut control process in engine control ECU. The flowchart which shows the watchdog clear output control processing in engine control ECU. The time chart for demonstrating the effect in embodiment. The time chart for demonstrating the effect in embodiment. The time chart for demonstrating the effect in embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Battery, 10 ... Idle stop control ECU, 20 ... Engine control ECU, 30 ... Starter, 31 ... Starter motor, 32 ... Relay switch, 33 ... Relay coil, 40 ... Relay, 41 ... Relay switch, 42 ... Relay coil

Claims (15)

An electronic control device for idle stop control (10) for determining whether or not the engine stop condition is satisfied and driving the starter motor (31) to start the engine when the engine stop condition is not satisfied;
It is determined whether or not the operation permission condition of the idle stop control electronic control device (10) is satisfied, and until the operation permission condition of the idle stop control electronic control device (10) is satisfied, the idle stop control electronic device When the power supply to the control device (10) is stopped and the operation permission condition of the idle stop control electronic control device (10) is satisfied, the idle stop control electronic control (10) is operated to operate the idle stop control electronic control device (10). A power control electronic control device (20) for supplying power to the device (10);
A starter control device comprising: An electronic control device for idle stop control (10) for determining whether or not the engine stop condition is satisfied and driving the starter motor (31) to start the engine when the engine stop condition is not satisfied;
It is determined whether or not the engine has been started, and power is supplied to the idle stop control electronic control unit (10) to operate the idle stop control electronic control unit (10) until the engine start is completed. A power control electronic control device (20) for stopping power supply to the idle stop control electronic control device (10) upon completion of engine start;
A starter control device comprising: An electronic control device for idle stop control (10) for determining whether or not the engine stop condition is satisfied and driving the starter motor (31) to start the engine when the engine stop condition is not satisfied;
It is determined whether or not the operation permission condition of the idle stop control electronic control device (10) is satisfied, and until the operation permission condition of the idle stop control electronic control device (10) is satisfied, the idle stop control electronic device When the power supply to the control device (10) is stopped and the operation permission condition of the idle stop control electronic control device (10) is satisfied, the idle stop control electronic control (10) is operated to operate the idle stop control electronic control device (10). A power source that supplies power to the device (10), determines whether or not the engine has been started, and stops the power supply to the electronic control device (10) for idle stop control when the engine has been started. An electronic control device (20) for control;
A starter control device comprising: 4. The starter control device according to claim 1, wherein the establishment of the operation permission condition of the electronic control device for idle stop control (10) means that the vehicle speed is smaller than a predetermined speed. The starter control device according to claim 1 or 3, wherein the operation permission condition of the electronic control device for idle stop control (10) is that the temperature state of the engine exceeds a predetermined level. 4. The starter control device according to claim 1, wherein the establishment of the operation permission condition of the electronic control device for idle stop control (10) means that a charge state of the battery exceeds a predetermined level. 5. 4. The starter control device according to claim 1, wherein the operation permission condition of the electronic control device for idle stop control (10) is that the engine rotational speed is smaller than a predetermined rotational speed. . 4. The starter control device according to claim 1, wherein the establishment of the operation permission condition of the electronic control device for idle stop control (10) means that a road inclination is smaller than a predetermined value. 5. The condition for allowing the operation of the electronic control device for idle stop control (10) to be satisfied is that the temperature of the catalyst installed in the exhaust pipe of the engine becomes equal to or higher than a predetermined value. The starter control device described. An electronic control device for idle stop control (10) for determining whether or not the engine stop condition is satisfied and driving the starter motor (31) to start the engine when the engine stop condition is not satisfied;
After the start of the engine is completed by the operation of the electronic control device for idle stop control (10) by supplying power to the electronic control device for idle stop control (10), the idle stop control device is used until a predetermined condition is satisfied. An electronic control device for power control (20) for stopping power supply to the electronic control device (10);
A starter control device comprising: The starter control device according to claim 10, wherein the predetermined condition after the start of the engine is completed is a predetermined time. 11. The starter control device according to claim 10, wherein the predetermined condition after the start of the engine is completed is until the charge state of the battery exceeds a predetermined level. The starter control device according to claim 10, wherein the predetermined condition after the start of the engine is completed is the time until the vehicle travels a predetermined distance. When the power supply control electronic control device (20) detects that the engine has been started, the power supply control electronic control device (20) sends information indicating that the engine has been started to the idle stop control electronic control device (10). The starter control device according to claim 2 or 3, wherein the electronic control device (10) stops the starter motor (31) when detecting that the start of the engine is completed based on the information. The power supply to the electronic control device for idle stop control (10) is stopped when the drive of the electronic control device for power control (20) is stopped. The starter control device described in 1.

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