JP4581835B2 - Electronic control device and idling stop control method - Google Patents

Description

  The present invention relates to a control system mounted on a vehicle, which is used to rotate an internal combustion engine mounted on the vehicle by itself when performing idling stop control to realize low fuel consumption driving of the vehicle. The present invention relates to an electronic control device for controlling the idling stop operation of a starter that drives the vehicle from outside, and an idling stop control method thereof.

  As is well known, idling stop control is performed in order to consciously stop ignition, fuel injection, exhaust, etc. during idling so as not to cause idling rotation when the vehicle stops for a short time, and to minimize fuel consumption.

  Conventionally, for example, a system described in Patent Document 1 is known as an in-vehicle control system that performs such idling stop control. Hereinafter, with reference to FIG. 17, an outline of a configuration generally employed in an in-vehicle control system, including the system described in Patent Document 1, will be described.

  As shown in FIG. 17, this system is roughly divided into a starter ST that drives an internal combustion engine (engine) mounted on the vehicle from the outside and rotates it by itself, and an idling stop operation of the starter ST. And an ISS (idling stop system) controller CT3. In such a system, an ignition switch IGSW for starting the engine as an ignition / start switch is provided in the power supply path of the starter ST (specifically, on the energization line of the relay coil), and the ISS controller CT3. And an electromagnetic starter relay SR that is driven to open (off) / close (on). More specifically, the switch IGSW and the relay SR are in each power supply path that joins (junction point P1) on the way from the power supply (power supply voltage “+ B”) of the starter ST to the starter ST, and are independent of each other. The power supply to the starter ST is arranged so that it can be intermittently controlled. Note that the power of the starter ST (power supply voltage “+ B” or “+ BB”) is supplied by, for example, an in-vehicle battery.

  Further, the ISS controller CT3 cooperates with the starter relay drive circuit SC3 that opens / closes the starter relay SR in the power supply path so as to perform intermittent control of power supply to the starter ST, and the circuit SC3. The microcomputer has a microcomputer MC3 for controlling the idling stop operation of the starter ST. Hereinafter, the details of the configuration of this system and the idling stop control method using this system will be further described with reference to FIG.

  As shown in FIG. 18, in this system, the transistor T20 is driven on / off based on a command from the microcomputer MC3, and the relay switch SRC of the starter relay SR is energized, and the relay switch thereof. The open / closed state of the SRW is controlled as desired. Along with this, the presence / absence of energization of the relay coil RC disposed in the power feeding path of the starter ST (starter motor M) is also controlled as desired in the open / closed state of the relay switch RW. It is like that. The transistor T20 is provided with resistance elements R21 and R22 set to a required resistance value, so that the switching operation is optimized. Incidentally, the resistance value of these resistance elements is set to a required resistance value according to, for example, the power supply voltage (Vcc) applied between the “emitter-collector” of the transistor T20.

  In this system, in addition to the drive of the starter relay SR, the power supply to the starter ST is controlled as desired by operating the ignition switch IGSW. That is, for example, when the switch (IGSW) is turned on (closed) / off (opened) by the driver (user), the relay coil RC disposed in the power feeding path of the starter ST (starter motor M) is also changed. The presence / absence of energization and thus the open / closed state of the relay switch RW are controlled as desired.

  That is, in this system, when the internal combustion engine is returned from the idling stop state to the idling run state (run return), based on the ON operation (power feeding operation) of the ignition switch IGSW by the driver or the like, Based on a command from the microcomputer MC3, the relay coil RC of the starter ST is energized. As a result, the relay switch RW is turned on (closed), and the power supply voltage (+ BB) is supplied to the starter motor M. The starter motor M starts cranking (starter drive) for the internal combustion engine. Will be.

  Conventionally, as this type of system, for example, a system as shown in FIG. 19 is known. Hereinafter, with reference to FIG. 19, an outline of this system and an idling stop control method using the same system will be described. In FIG. 19, the same elements as those shown in FIGS. 17 and 18 are denoted by the same reference numerals, and redundant description of these elements is omitted.

  As shown in FIG. 19, this system also generally includes an ISS controller CT3 that supplies current to a starter relay SR arranged in a power supply path of a starter ST to be controlled at a desired timing. It is configured. However, here, the above-described ignition switch IGSW that is opened and closed by the operation of the driver or the like is also provided in the power supply path of the starter relay SR, and this also controls the intermittent power supply to the relay SR. It is like that. That is, in this system, the starter relay SR is driven to open (off) / close (on) by these switches IGSW and controller CT3. Specifically, among these, the ISS controller CT3 is based on the presence or absence of current supply to the starter relay SR through the power supply path that merges with the power supply path where the ignition switch IGSW is arranged (merge point P2). The starter relay SR is configured to be controlled to be closed / open.

That is, after all, even in this system, when returning the internal combustion engine from the idling stop state to the idling run state (run return), based on the ON operation of the ignition switch IGSW by the driver or the like (user) or Based on the command of the microcomputer MC3, the relay coil of the starter ST is energized. As a result, the relay switch is turned on (closed) and the power supply voltage (+ BB) is supplied to the starter motor, and cranking (starter drive) for the internal combustion engine is started by the starter motor. become.
JP 2004-137905 A

  By the way, in the system shown in FIGS. 17 to 19, the power supply path (energization line) by the ignition switch IGSW which is the ignition / start switch of the internal combustion engine is the power supply path (energization line) by other means. To come together. Specifically, for example, in the system shown in FIG. 17 and FIG. 18, regarding the power supply path to the starter ST to be controlled, the power supply path by the ignition switch IGSW and the power supply path by the starter relay SR Are joined together at the junction P1. In the system shown in FIG. 19, with respect to the power feeding path to the starter relay SR, the power feeding path by the ignition switch IGSW and the power feeding path by the ISS controller CT3 merge at the junction P2. is doing. For this reason, if power supply may be performed simultaneously with the switch IGSW by means for joining these power supply paths (relay SR or controller CT3), a current exceeding the specified value (overcurrent) Current) is supplied, and there is a concern that the same path (common part after joining), the relay element, and further the starter itself may be damaged. Hereinafter, this problem will be further described with reference to FIGS. 20A to 20C taking the system shown in FIGS. 17 and 18 as an example. 20A and 20B are time charts showing the transition of the on / off state of the starter relay SR and the ignition switch IGSW, and FIG. 20C is a power feeding path of the starter ST (relay coil RC). Specifically, it is a time chart showing the transition of the current amount in the common part after the merge (merging point P1).

  As shown in FIGS. 20A to 20C, while power is supplied to the starter ST only by the drive control (on control) of the starter relay SR by the ISS controller CT3, The amount of current in the power supply path (broken line in FIG. 20C) is in an appropriate range (specified range). However, here, for example, when the driver or the like (user) further turns on the ignition switch IGSW when the idling stop control is returned to the run, and power supply based on this is started, a solid line is shown in FIG. As described above, a current (overcurrent) of a specified value or more is intensively supplied to a part of the power feeding path (common part after joining). As a result, there is a concern that the path (wiring), the relay element, and the starter itself may be damaged.

  In the past, these wires (wiring members), relay elements, and starters that can withstand such overcurrents have been selected and adopted. However, depending on such a configuration, these parts ( This leads to problems such as an increase in size and cost. In addition to this, for example, as disclosed in Japanese Patent Application Laid-Open No. 2005-90301, a configuration in which a switch (changeover switch) for switching automatic / manual operation of a starter is provided. However, depending on such a configuration, the control is complicated, so that an environment in which failure is likely to occur is created, and it is not yet sufficient to cope with so-called unexpected situations such as failure. In other words, after all, even with these configurations, the above problems have not been drastically solved.

  In addition, in a system in which another starter is provided to cope with a starter failure / consumption, for example, in a system having two starters as shown in FIG. It becomes a problem. Hereinafter, this problem will be further described with reference to FIGS. 21 and 22. FIG. 21 is a block diagram showing a schematic configuration of this system.

  As shown in FIG. 21, this system roughly includes first and second starters ST1 and ST2 that drive an internal combustion engine (engine) mounted on the vehicle from the outside and rotate it by itself. Of these, the ISS controller CT3 for controlling the idling stop operation of the second starter ST2 is provided. Specifically, the controller CT3 includes a starter relay drive circuit SC2 that opens (off) / closes (on) the starter relay SR2 in the power supply path in order to perform intermittent control of power supply to the second starter ST2. The microcomputer MC3 is configured to control the idling stop operation of the second starter ST2 in cooperation with the circuit SC2.

  On the other hand, for the first starter ST1, an ignition switch IGSW, which is an ignition / start switch for the internal combustion engine, is provided particularly for the power supply path, and the switch IGSW is turned off (open) / on (closed). Based on the operation, power supply to the first starter ST1 is interrupted. The power supply path (specifically, the energization line of the relay coil) of the first starter ST1 in which the ignition switch IGSW is disposed is the power supply path to the second starter ST2 in which the starter relay SR2 is disposed (same as above). Both are connected to a common power supply (power supply voltage “+ B”).

  That is, in this system, when the internal combustion engine is returned from the idling stop state to the idling run state (run return), based on an ON operation of the ignition switch IGSW by the driver or the like, or based on a command of the microcomputer MC3. Thus, power is supplied to one of the starters ST1 and ST2. Then, cranking (starter driving) for the internal combustion engine is started by the starter (starter motor).

  FIG. 22 is a time chart showing an operation example of the system. 22A to 22D, (a) and (b) are time charts showing the transition of the on / off state of the starter relay SR2 and the ignition switch IGSW, and (c) and (d). ) Is a time chart showing the transition of the amount of current in the power supply path of the second and first starters ST2 and ST1.

  As indicated by broken lines in FIGS. 22 (c) and 22 (d), power is supplied to only one of the starters ST1 and ST2 by turning on the starter relay SR2 by the controller CT3 or turning on the ignition switch IGSW by the user. While being performed, the amount of current supplied to the starter is within an appropriate range (specified range). However, here, as shown by the solid lines in FIGS. 22 (a) and 22 (b), if power is supplied to these two starters ST1 and ST2 at the same time, As shown by the solid line in (d), the amount of current supplied by the common power supply (power supply voltage “+ B”) is insufficient, and it becomes difficult to secure the power necessary for driving each starter. These starters may even cause a drive failure.

  In order to avoid such a situation, for example, as a power source (such as an in-vehicle battery) for the two starters ST1 and ST2, a capacity sufficient to ensure sufficient power even when these two starters are driven simultaneously. It is also possible to adopt a power source (battery) with However, this configuration also causes new problems such as an increase in the size and cost of the power supply body. As a result, the system using these two starters has not yet been put into practical use. is there.

  The present invention has been made in view of the above circumstances, and it is possible to suppress the complication of the controllability, and even when a power feeding operation is performed at an incorrect timing when the idling stop control is returned to the run, the starter body and the relay element It is an object of the present invention to provide an electronic control device and an idling stop control method thereof that can keep the amount of current supplied to the battery within a specified range.

  In order to achieve such an object, according to the first aspect of the present invention, a starter that drives the on-board internal combustion engine from the outside in order to rotate the vehicle-mounted internal combustion engine by itself, A starter switch for intermittently supplying power to the starter based on the operation, and a power supply path of the starter that joins the starter switch in the middle of the starter switch and is opened / closed. And a starter relay that intermittently feeds power to the starter, the starter relay being opened / closed separately from the off / on operation of the starter switch. Then, as an electronic control device for controlling the idling stop operation of the starter, the power feeding path on which the starter switch is disposed is temporarily fixed in a cut-off state. And prohibiting means for prohibiting power supply to the starter based on the operation of the starter switch only during this period, and when returning the internal combustion engine from the idling stop state to the idling run state, the prohibiting means causes the starter switch to Power supply to the starter based on the operation is prohibited, and in this state, the drive of the starter is controlled in cooperation with the starter relay.

  In the on-vehicle control system including the electronic control device, a starter switch is disposed in a power supply path of a starter to be controlled, and power supply to the starter is intermittently switched according to an off / on state of the starter switch. It has come to be. That is, during normal times, for example, when the switch is turned on (closed) by the driver, power is supplied to the starter. Conversely, when the switch is turned off (opened), power is supplied to the starter. The However, in the above-described configuration as an electronic control device for controlling a vehicle (particularly a starter), a prohibiting means for temporarily fixing the power supply path in which the starter switch is disposed to a cutoff state is newly provided, and the internal combustion engine is When returning from the idling stop state to the idling run state (run return), the prohibition means blocks the route. As a result, while the return of the engine to the run is being performed, even if a manual power feeding operation, that is, a starter switch on operation is performed at an incorrect timing, power feeding is not performed through this path. That is, the current (overcurrent) exceeding the specified value is not supplied to a part of the power supply path (the common part after merging). As a result, the same path (wiring), relay element, and even the starter itself The situation of damaging the battery is preferably avoided.

  Moreover, according to such a configuration, it is possible to avoid such overcurrent only by adding the prohibiting means, so that the simple configuration of the system itself is maintained, and the maintainability thereof is also maintained high. Furthermore, the control required for the prohibiting means is simple, such as when the power supply based on the starter switch operation is to be prohibited (prohibited period), the means is turned on (shut off) (on (shut off) is controlled). This is all that is required for simple control, and this controllability is kept extremely simple.

  For example, if a plurality (for example, two) of the prohibiting means are connected in series, even if one of them is out of order (closed and fixed), it is possible to flexibly cope with this. Become. In other words, the above-described configuration has a feature that the security level can be easily and easily increased, and has a strong resistance to a so-called unexpected situation such as the above-described failure.

  According to a second aspect of the present invention, in the electronic control device according to the first aspect, in addition to the starter, the system includes a return starter that drives the internal combustion engine from the outside, Further, a return starter relay for intermittently supplying power to the return starter based on being disposed in the power supply path of the return starter and being driven to open / close, and an abnormality of the return starter are detected. An abnormality detection means, and in the system, in the normal time, the return starter from the idling stop state to the idling run state is cooperated with the return starter relay. On the other hand, when the abnormality is detected by the abnormality detection means, the drive of the return starter is stopped and the So as to perform the return to idle run state to the other of the starter from the idling stop state of the combustion engine.

  According to such a configuration, even if the return starter or the return starter relay that is used in normal times becomes unusable due to, for example, failure or wear, this is detected as an abnormality of the return starter. The engine is properly returned to the run by another normal starter (the starter). Incidentally, this starter (the starter) can be used for starting an internal combustion engine, for example.

  When an abnormality of the return starter is detected by the abnormality detection means, not only simply stopping the drive of the return starter but also stopping this drive and further prohibiting this drive, It is possible to further increase the security level.

  According to a third aspect of the present invention, in the electronic control device according to the second aspect, the starter is controlled to be operated / stopped based on an on / off operation of the starter switch. The other return starter is configured such that its operation / stop is controlled separately from the operation of the starter switch.

  With such a configuration, the starter switch starts an operation based on this operation (manual operation) even if the starter switch is turned on (power supply operation) by cutting off the power supply path by the prohibiting means. Will disappear. In other words, during a normal run return using the return starter, even if a manual power feeding operation is performed at an incorrect timing, that is, when the starter switch is turned on, the two starters are mistakenly associated with the erroneous operation. The situation of simultaneous operation (power supply) is preferably avoided, and various problems due to temporary excessive power consumption, such as the problem of power shortage when the starter is driven, are prevented. It will be done.

  Further, at this time, according to the invention described in claim 4, during the period in which power supply to the starter based on the operation of the starter switch is prohibited, the prohibiting means causes the power supply path provided with the starter switch to If the power supply path where the starter relay is arranged is fixed in the cut-off state and power supply to the starter based on the starter relay is also prohibited, the starter switch can be operated only by mistake. In addition, a situation in which the above two starters are simultaneously fed and operated, which may occur due to failure or wear (eg, fixed on (closed)) of the starter relay, is preferably avoided. . That is, by adopting such a configuration, it is possible to more reliably prevent various problems including the above-described problem of power shortage during starter driving.

  Specifically, as the prohibiting means, specifically, according to the invention described in claim 5, between the starter switch and the starter, the power supply path in which the starter switch is disposed and the starter relay are arranged. The starter switch is disposed near the starter from the junction with the power supply path provided or closer to the starter and prohibits power supply to the starter based on the operation of these starter switches and the starter relay drive. It is effective to employ a switching element that cancels the prohibition with a transition from the open state to the closed state. According to such a configuration, the configuration described in claim 4 can be easily realized in a form that is in accordance with the actual situation.

  Further, in the invention described in claim 6, on the premise of the configuration described in claim 4 or 5, an auxiliary control device for assisting control by the electronic control device is further provided in a form communicably connected to the auxiliary control device. The control device is configured to perform drive control of the prohibiting unit. According to such a configuration, even when an abnormality such as a failure occurs in the electronic control device, the drive of the prohibiting unit is controlled as desired by the auxiliary control device connected to be communicable with the electronic control device. become. For this reason, the inconvenience associated with the erroneous operation of the starter switch described above can be avoided more suitably with a higher security level.

  Also, in this case, during normal times, the auxiliary control device performs the drive control of the prohibiting means while monitoring the presence or absence of abnormality of the electronic control device, and the auxiliary control device controls the electronic control. If the configuration is such that the auxiliary control device performs drive control of the prohibiting means instead of the electronic control device only when an abnormality of the device is detected, communication between the electronic control devices is normal (normal time). Therefore, the starter drive control is performed without the need for the above, and the security level is further increased.

  On the other hand, as the prohibiting means in the electronic control device according to any one of claims 1 to 3, specifically, according to the invention according to claim 7, the starter switch and the starter The switching element is arranged between the switching element for prohibiting power supply to the starter based on the operation of the starter switch with a continuous open state and releasing the prohibition with a transition from the open state to the closed state. It is effective to adopt one. According to such a configuration, the configuration according to any one of the first to third aspects can be easily realized in a form that is in accordance with the actual situation.

  Further, as the switching element including the invention described in claim 5, it is possible to adopt a switching element constituted by a switching element made of a semiconductor element as in the invention described in claim 8. It is particularly effective. In general, many switching elements made of semiconductor elements such as transistors have a long life and are low in cost. For this reason, such a configuration is particularly effective for realizing a highly reliable configuration at low cost.

  In the invention according to claim 9, on the premise of the configuration according to any one of claims 2 to 8, the auxiliary control device for assisting the control by the electronic control device is connected in a communicable manner. And having the auxiliary control device perform drive control of the starter relay and the prohibiting means. According to such a configuration, even when an abnormality such as a failure occurs in the electronic control device, the starter relay is driven (open / closed drive) by the auxiliary control device that is communicably connected to the electronic control device. And the driving of the prohibiting means is controlled as desired. As a result, not only when an abnormality occurs in the return starter and the return starter relay, but also when an abnormality such as a failure occurs in the electronic control unit itself that controls these, It becomes possible to continue to maintain control.

  In the electronic control device according to any one of claims 1 to 9, according to the invention according to claim 10, the starter switch is an ignition / start switch of the in-vehicle internal combustion engine, that is, a driver. It is particularly effective to adopt a configuration that is an ignition switch that starts the engine based on a manual operation by the user (user).

  In general, the main application of the starter is to start an internal combustion engine in addition to the above-described run recovery of the internal combustion engine. The start of the internal combustion engine is usually executed in response to an operation (usually a key operation) of an ignition switch, which is a start switch, so as to be executed based on the intention of the user (driver or the like). Yes. According to the configuration described in claim 10, the amount of current supplied to the starter body and the relay element described above can be kept within a specified range even in a configuration that satisfies the two applications described here at the same time. Thus, the configuration according to any one of claims 1 to 9 is suitably realized in a form more suitable for the actual situation.

According to an eleventh aspect of the present invention, the first and second starters for driving the in-vehicle internal combustion engine from the outside in order to rotate the vehicle-mounted internal combustion engine by itself, and the power supply path of the first starter are disposed. A starter switch for intermittently supplying power to the first starter based on the off / on operation, and a power supply common to the power supply path of the first starter in which the starter switch is disposed. In a vehicle-mounted control system comprising a starter relay that is arranged in the power supply path of the second starter and is driven to open / close, and that intermittently supplies power to the second starter. As an electronic control device for controlling the idling stop operation of the second starter by opening / closing the starter relay, the power supply path provided with the starter switch is temporarily cut off. And a prohibiting means for prohibiting power supply to the first starter based on the operation of the starter switch only during this period, and when returning the internal combustion engine from the idling stop state to the idling run state, A configuration in which power supply to the first starter based on the operation of the starter switch is prohibited by a prohibiting means, and in this state, driving of the second starter is controlled in cooperation with the starter relay; To do.

  According to such a configuration, even if the starter switch is turned on (power feeding operation) by cutting off the power feeding path by the prohibiting means, the first starter starts operation based on this operation (manual operation). You wo n’t have to. That is, while the run return is performed by the second starter, even if a manual power feeding operation, that is, a starter switch is turned on at an incorrect timing, the two (first and first) A situation in which the second starter is erroneously operated at the same time (powered) is preferably avoided. As a result, the above-described situation that the amount of current required for driving these starters is not supplied can be suitably avoided. In this case as well, as described above, the simple configuration of the system itself is maintained and maintainability is maintained high. Also, the controllability is kept simple as described above.

In addition , the first system is based on the fact that the system is disposed in the power supply path of the first starter connected to the common power source separately from the starter switch and is driven to open / close. for it constituted the power supply to the starter as further comprising a first starter relay for intermittently, before Symbol period for prohibiting the supply of power to the first starter based on the operation of the starter switch, by the inhibiting means In addition to the power supply path in which the starter switch is disposed, the power supply path in which the first starter relay is disposed is also fixed in a cut-off state, and the first starter relay based on the first starter relay is fixed. By configuring so that power feeding is also prohibited, not only erroneous operation of the starter switch, but also failure / consumption of the first starter relay (for example, fixed on (closed)) May occur due to constant, so that the two (first and second) starter of this is preferably avoided also a situation that would be powered, it operated simultaneously. That is, by adopting such a configuration, the above-described problem of power shortage during starter driving can be more reliably prevented.

As such a prohibiting means, specifically, as in the invention described in claim 12 , the power supply path between the starter switch and the first starter and provided with the starter switch and the first The starter relay is disposed nearer the first starter than the junction with the power supply path where the first starter relay is disposed, and the starter switch is operated and the first starter relay is operated in a continuous open state. It is effective to employ a switching element that prohibits power supply to the first starter based on driving and cancels the prohibition with a transition from the open state to the closed state. According to such a configuration, the configuration according to the eleventh aspect can be easily realized in conformity with the actual situation.

Further, in the invention described in claim 13 , on the premise of the configuration described in claim 11 or 12 , the auxiliary control device for assisting the control by the electronic control device is further provided in a form communicably connected to the auxiliary control device. The control device is configured to perform drive control of the prohibiting unit. According to such a configuration, even when an abnormality such as a failure occurs in the electronic control device, the prohibiting means is driven (open / closed drive) by the auxiliary control device communicatively connected to the electronic control device. It will be controlled as desired. For this reason, the inconvenience associated with the erroneous operation of the starter switch described above can be avoided more suitably with a higher security level.

  Also in this case, as described above, if the configuration is such that the auxiliary control device performs drive control of the prohibiting means only when an abnormality of the electronic control device is detected, instead of the electronic control device, it is normal. At the time (normal time), the drive control of the starter is performed without communication between the electronic control units, so that the security level is further increased.

In addition, the switching element including the invention described in claim 12 as described above has a switching element composed of a semiconductor element as in the invention described in claim 14 as described above. Employment is particularly effective.

Further, in the invention according to claim 15 , in the electronic control device according to any one of claims 11 to 14 , the system is connected to the common power source separately from the starter switch. In the system, a first starter relay is provided that intermittently feeds power to the first starter based on being opened / closed by being disposed in the power feeding path of the first starter. An auxiliary control device that assists the control by the electronic control device is connected in a communicable manner so that the auxiliary control device performs drive control of the first starter relay and the prohibiting means.

  According to such a configuration, even when an abnormality such as a failure occurs in the electronic control device, the auxiliary control device connected to be communicable with the electronic control device drives the first starter relay (open / open). Closed drive) and the drive of the prohibiting means are controlled as desired. As a result, the situation in which the above-described two (first and second) starters are simultaneously operated (powered) is more preferably avoided with a higher security level.

Further, in the electronic control device according to any one of claims 11 to 15 , as in the invention according to claim 16 , the starter switch is an ignition / start switch of the in-vehicle internal combustion engine, that is, a driver. It is particularly effective when used in a configuration that is an ignition switch that starts the engine based on a manual operation of the user (user).

On the other hand, in the invention described in claim 17 , in order to rotate the in-vehicle internal combustion engine by itself, the starter is driven from the outside, and the starter is disposed in the power supply path of the starter and is turned off / on. Based on the starter switch for intermittently supplying power to the starter, and being disposed in the power supply path of the starter that merges with the power supply path in which the starter switch is arranged and driven to open / close. An on-vehicle control system configured to include a starter relay that intermittently supplies power to the starter, and an idling stop operation of the starter based on an off / on operation of the starter switch and an open / close drive of the starter relay As an idling stop control method for controlling the system, a power feeding path in which the starter switch is arranged for the system When the internal combustion engine is returned from the idling stop state to the idling run state by further providing a prohibiting means for temporarily fixing the shut-off state and prohibiting power supply to the starter based on the operation of the starter switch during this period. The prohibiting means prohibits power supply to the starter based on the operation of the starter switch, and controls the starter drive under the starter relay drive in this state.

If such a method is adopted as the idling stop control method, when the power supply path is interrupted by the prohibiting means, the internal combustion engine is returned from the idling stop state to the idling run state (run return). Even if a manual power supply operation is performed at an incorrect timing, that is, when the starter switch is turned on, a current (overcurrent) exceeding the above-mentioned specified value is supplied to a part of the power supply path (common part after joining). As a result, a situation in which the same path (wiring), a relay element (particularly a starter relay), or the like is damaged is preferably avoided. Moreover, in this case as well, as described above, the simple configuration of the system itself is maintained and its maintainability is maintained high. Further, the controllability is kept simple as described above.

(First embodiment)
A first embodiment that embodies an electronic control device and an idling stop control method according to the present invention will be described below with reference to FIGS. Note that the system according to this embodiment also includes an ISS (idling stop system) controller, as in the systems illustrated in FIGS. 17 to 19, by which the internal combustion engine mounted on the vehicle can be driven by itself. The engine is configured to control an idling stop operation of a starter that drives the engine from the outside for rotation.

  First, an internal combustion engine control system (in-vehicle control system) including such an ISS controller (electronic control device), and particularly an outline of its configuration, will be described with reference to FIG. FIG. 1 is a block diagram schematically showing a schematic configuration of the system.

  As shown in FIG. 1, this system mainly includes a starter ST that drives an internal combustion engine (engine) mounted on the vehicle from the outside, and an ISS controller that controls an idling stop operation of the starter ST. It comprises CT. In such a system, an ignition switch IGSW for starting the engine as an ignition / start switch is provided in the power supply path of the starter ST (specifically, on the energization line of the relay coil), and the ISS controller CT. And an electromagnetic starter relay SR which is driven off (open) / on (closed) by the motor. More specifically, the switch IGSW and the relay SR are independent of each other in the power supply paths that merge (merge point P1) on the way from the power supply (power supply voltage “+ B”) of the starter ST to the starter ST. It is arrange | positioned so that the intermittent control of the electric power feeding to can be performed. In this system as well, the power of the starter ST (power supply voltage “+ B” or “+ BB”) is supplied by, for example, an in-vehicle battery.

  Further, in this system, the power supply path in which the ignition switch IGSW is disposed is temporarily fixed in a cut-off state, and power is supplied to the starter ST based on the operation (power supply operation) of the switch IGSW only during this period. A cut relay CR to be prohibited is further provided. Specifically, the cut relay CR is disposed between the ignition switch IGSW and the starter ST, more specifically, closer to the switch IGSW than the junction P1 of the power supply path. The cut relay CR is prohibited from being supplied with power to the starter ST based on the operation of the switch IGSW when the cut relay CR is continuously turned on (open), and prohibited when the cut relay CR is changed from the on (open) state to the off (closed) state. Is configured to release.

  The ISS controller CT cooperates with the starter relay drive circuit SC that opens / closes the starter relay SR in the power supply path in order to perform intermittent control of power supply to the starter ST, and the circuit SC. The microcomputer has a microcomputer MC for controlling the idling stop operation of the starter ST. The ISS controller CT is further provided with a cut relay drive circuit CC for driving the cut relay CR in addition to such a configuration, and the cut relay CR is driven at a desired timing based on a command from the microcomputer MC. It is configured to be able to drive on (open) / off (close). In this embodiment, the cut relay CR and the cut relay drive circuit CC function as prohibiting means.

  Next, with reference to FIG. 2, the details of the configuration of the system and the idling stop control method by the system will be further described. FIG. 2 is a circuit diagram showing details of the system configuration.

  As shown in FIG. 2, even in this system, the transistor T10 is turned on / off based on a command from the microcomputer MC (whether current is supplied or not), and the relay coil SRC of the starter relay SR is energized. The presence / absence of the relay switch SRW and the on / off (open) state of the relay switch SRW are controlled as desired. Accordingly, the same applies to the presence / absence of energization of the relay coil RC arranged in the power feeding path of the starter ST (starter motor M), and the on / off (open) state of the relay switch RW. This is controlled as desired. Also in this case, the transistor T10 is provided with resistance elements R11, R12, etc. set to a required resistance value, so that the switching operation is optimized. The resistance values of these resistance elements are set to required resistance values according to, for example, the power supply voltage (Vcc) applied between the “emitter-collector” of the transistor T10.

  The cut relay CR is also configured as a so-called electromagnetic relay mainly composed of a relay coil CRC and a relay switch CRW. The cut relay CR is opened according to the off / on drive of the transistor T constituting the cut relay drive circuit CC. / Closed drive. Here, the switching operation is optimized by providing resistance elements R1, R2, and the like set to a required resistance value for the transistor T.

  Also in this system, as in the systems illustrated in FIGS. 17 to 19, the starter ST is not only driven by opening / closing the starter relay SR described above but also by operating the ignition switch IGSW. The presence / absence of power supply to is controlled as desired. That is, for example, when the switch (IGSW) is turned on (closed) / off (opened) by the driver (user), the relay coil RC disposed in the power feeding path of the starter ST (starter motor M) is also changed. The presence / absence of energization and the on / off (open) state of the relay switch RW are controlled as desired.

  As described above, also in this system, the starter is based on an ON operation (power feeding operation) of the ignition switch IGSW by a driver or the like (user) at a desired timing, or based on a command from the microcomputer MC. The relay coil RC of ST is energized, and the relay switch RW is turned on (closed) accordingly. Then, the power supply voltage (+ BB) is supplied to the starter motor M, and the starter motor M starts cranking (starter driving) for the internal combustion engine. However, in this embodiment, by providing the cut relay CR and the cut relay drive circuit CC, a concentrated overcurrent with respect to a part of the above-described feeding path (common part after joining) is suppressed. Thus, the amount of current supplied to the starter ST is also within the specified range. Hereinafter, the control mode of the cut relay CR will be described in detail with reference to FIG. Note that FIGS. 3B to 3D used in the description here are time charts corresponding to FIGS. 20A to 20C. 3A is a time chart showing the transition of the on / off state of the cut relay CR.

  As shown in FIG. 3B, in this embodiment, when the internal combustion engine is returned from the idling stop state to the idling run state (run return), the starter relay SR by the ISS controller CT is used. In this drive control (on (closed) control), power is supplied to the starter ST. At least during this power supply, the cut relay CR is controlled to be turned on (opened) as shown in FIG. 3A, and power is supplied to the starter ST based on the operation of the ignition switch IGSW. Is now prohibited. Specifically, during this period, even if the driver or the like (user) turns on the ignition switch IGSW (broken line in FIG. 3C), the power supply path is set by the cut relay CR. Since it is still in the cut-off state, power is not supplied to the starter ST through the same path. That is, whether the switch IGSW is turned on or not, a current that is equal to or greater than the prescribed value described above with respect to the common part after merging (merging point P1) between this feeding path and the feeding path by the starter relay SR. (Overcurrent) is not supplied (broken line in FIG. 3D), and the supply current amount in the same path is within the specified range (solid line in FIG. 3D).

  Here, the cut relay driving circuit CC for driving the cut relay CR is configured as a switching element made of a semiconductor element, that is, a transistor T, as shown in FIG. Thus, by adopting a semiconductor element as the cut relay drive circuit CC, this system has a highly reliable configuration in terms of failure accompanying aging, that is, life. In addition to the cut relay driving circuit CC, the cut relay CR itself is configured as a switching element (for example, a transistor) made of a semiconductor element instead of the electromagnetic relay shown in FIG. A more reliable configuration can be realized at low cost.

As described above, according to the electronic control device and the idling stop control method according to this embodiment, the following excellent effects can be obtained.
(1) As an ISS controller CT for controlling the idling stop operation of the starter ST, a cut relay CR for temporarily fixing the power supply path in which the ignition switch IGSW, which is an ignition / starting switch of the internal combustion engine, is arranged in a cut-off state, A cut relay drive circuit CC (prohibiting means) is provided. Thus, when the engine is returned from the idling stop state to the idling run state, the cut relay CR and the cut relay drive circuit CC prohibit power supply to the starter ST based on the operation of the ignition switch IGSW. In this state, the drive of the starter ST is controlled in cooperation with the starter relay SR. As a result, when the internal combustion engine is returned from the idling stop state to the idling run state (run return), even if a manual power feeding operation, that is, the ignition switch IGSW is turned on at an incorrect timing, On the other hand, the current (overcurrent) exceeding the specified value is not supplied. That is, damage to the same path (wiring), the relay element, and further the starter itself is preferably avoided. In addition, in such a configuration, such an overcurrent can be avoided simply by adding the cut relay CR and the cut relay drive circuit CC (prohibiting means), so that the simple configuration of the system itself is maintained, and as a result, maintainability thereof. Will also be kept high. Further, regarding the control at the time of driving the cut relay CR, when the power supply based on the operation of the ignition switch IGSW is to be prohibited (prohibition period), the relay CR is turned on (open) (on (open) control). All that is required is simple control, and this controllability is kept very simple.

  (2) It is disposed between the switch IGSW and the starter ST, prohibits power supply to the starter ST based on the operation of the switch IGSW with a continuous open state, and has a transition from the open state to the closed state. The switching element that cancels the prohibition, that is, the cut relay CR is adopted as the prohibiting means. As a result, the above configuration can be easily realized in conformity with the actual situation.

  (3) Further, if such a switching element (cut relay CR) having a switching element (transistor or the like) made of a semiconductor element is adopted, the above configuration is more reliable. The configuration is realized at a low cost.

(First comparative example)
Next, a first comparative example for the first embodiment will be described with reference to FIG. FIG. 4 is a block diagram corresponding to FIG. 1. In FIG. 4, the same elements as those shown in FIG. I will omit the explanation. As is clear from FIG. 4, the comparative example, Ru der those that correspond to the system as illustrated in the previous Figure 19.

  As shown in FIG. 4, this system also generally includes an ISS controller CT that supplies current to a starter relay SR arranged in a power feeding path of a starter ST to be controlled at a desired timing. It is configured. However, here, the above-described ignition switch IGSW that is opened and closed by the operation of the driver or the like is also provided in the power supply path of the starter relay SR, and this also controls the intermittent power supply to the relay SR. It is like that. In other words, in this system, the starter relay SR is driven to open (off) / close (on) by these switches IGSW and controller CT. Specifically, among these, the ISS controller CT is based on the presence or absence of current supply to the starter relay SR through the power feeding path that joins the middle of the power feeding path in which the ignition switch IGSW is disposed (merge point P2). The starter relay SR is configured to be controlled to be closed / open.

  Also in this system, as in the first embodiment, the power supply path in which the ignition switch IGSW is disposed is temporarily fixed in a cut-off state, and the switch IGSW is operated (power supply operation) only during this period. Is further provided with a cut relay CR for prohibiting power supply to the starter ST based on the above. Specifically, the cut relay CR is disposed between the ignition switch IGSW and the starter ST, more specifically, closer to the switch IGSW than the junction P2 of the power feeding path. The cut relay CR is prohibited from being supplied with power to the starter ST based on the operation of the switch IGSW when the cut relay CR is continuously turned on (open), and prohibited when the cut relay CR is changed from the on (open) state to the off (closed) state. Is configured to release.

The ISS controller CT includes a cut relay drive circuit CC that drives the cut relay CR, and turns the cut relay CR on / off at a desired timing based on a command from the built-in microcomputer MC. (Closed) It can be driven. In this comparative example , the cut relay CR and the cut relay drive circuit CC function as prohibiting means.

  Thus, also in this system, the starter ST is based on an ON operation (power feeding operation) of the ignition switch IGSW by a driver or the like (user) at a desired timing, or based on a command from the microcomputer MC. The relay coil is energized, and the power supply voltage (+ BB) is supplied to the starter motor. Thus, cranking (starter drive) for the internal combustion engine is started by the starter motor. At this time, since the cut relay CR and the cut relay drive circuit CC are provided, for example, a part of the above-described feeding path (confluence (junction point) has an operation according to the operation example shown in FIG. The intensive overcurrent with respect to the common part after P2) is suppressed, and the amount of current supplied to the starter ST can be kept within a specified range.

  That is, when the internal combustion engine is returned from the idling stop state to the idling run state, the cut relay CR and the cut relay drive circuit CC are used to switch the starter relay SR to the starter relay SR based on the ON operation (power feeding operation) of the ignition switch IGSW. Prohibit power supply. In this state, the drive of the starter ST to be controlled is controlled under the drive control of the starter relay SR based on the presence or absence of current supply by the ISS controller CT. As a result, whether or not the ignition switch IGSW is turned on, a current (overcurrent) that is equal to or greater than the above-mentioned specified value is supplied to the power supply path (particularly the portion after merging) of the starter ST. Thus, the supply current amount in the same path and the starter relay SR is within the specified range.

As described above, the electronic control device and the idling stop control method according to this comparative example can achieve the same effects as the effects (1) to (3) or an effect equivalent thereto.

( Second comparative example )
Next, a second comparative example will be described with reference to FIGS. As is apparent from FIG. 5, this comparative example, Ru der those that correspond to the system as illustrated in previous figures 21.

  As shown in FIG. 5, this system roughly includes first and second starters ST1 and ST2 that drive an internal combustion engine (engine) mounted on the vehicle from the outside and rotate it by itself. Of these, the ISS controller CT for controlling the idling stop operation of the second starter ST2 is provided. Specifically, the controller CT opens or turns off the starter relay SR2 in the power supply path so as to perform intermittent control of power supply to the second starter ST2. The microcomputer has a microcomputer MC for controlling the idling stop operation of the second starter ST2 in cooperation with the circuit SC2.

  On the other hand, for the first starter ST1, an ignition switch IGSW, which is an ignition / start switch for the internal combustion engine, is provided particularly for the power supply path, and the switch IGSW is turned off (open) / on (closed). Based on the operation, power supply to the first starter ST1 is interrupted. That is, the operation / stop of the first starter ST1 is controlled based on the on / off operation of the ignition switch IGSW, and the other second starter ST2 is operated separately / independent of the operation of the switch IGSW. Stop is controlled. In this system as well, the power supply path of the first starter ST1 in which the ignition switch IGSW is disposed is the same as that in the system illustrated in FIG. 21, and the second starter in which the starter relay SR2 is disposed. Both power supply paths to ST2 are connected to a common power source (power supply voltage “+ B”).

However, in this system, as in the first embodiment and the first comparative example , the power supply path in which the ignition switch IGSW is disposed is temporarily fixed in a cut-off state, and the switch IGSW is used only during this period. There is further provided a cut relay CR for prohibiting power supply to the starter ST based on the above operation (power supply operation). Specifically, the cut relay CR is disposed between the ignition switch IGSW and the first starter ST1, and the first starter ST1 based on the operation of the switch IGSW with a continuous on (open) state. The power supply to the power supply is prohibited, and the prohibition is canceled with a transition from the on (open) state to the off (closed) state.

The ISS controller CT is further provided with a cut relay drive circuit CC for driving the cut relay CR in addition to the above configuration, and the cut relay at a desired timing based on a command of the built-in microcomputer MC. The CR can be driven on (open) / off (closed). The cut relay drive circuit CC is configured as a switching element made of a semiconductor element as in the first embodiment and the first comparative example (see FIG. 2). And also in this comparative example , these cut relay CR and the cut relay drive circuit CC function as a prohibition means.

As described above, also in this system, the first and the second are based on an ON operation of the ignition switch IGSW by a driver or the like (user) at a desired timing or based on a command from the microcomputer MC. Electric power is supplied to one of the starters ST1 and ST2. Then, cranking (starter driving) for the internal combustion engine is started by the starter (starter motor). However, in this comparative example , since the cut relay CR and the cut relay drive circuit CC are provided, the engine is driven when the internal combustion engine is returned from the idling stop state to the idling run state (run return). This ensures that the power required for this is supplied to the starter. Hereinafter, the control mode of the cut relay CR will be described in detail with reference to FIG. FIGS. 6B to 6E used in the description are time charts corresponding to FIGS. 22A to 22D. In FIG. 6, (a) is a time chart showing the transition of the on / off state of the cut relay CR.

As shown in FIG. 6B, in this comparative example, when the internal combustion engine is returned from the idling stop state to the idling run state (run return), the starter relay SR2 by the ISS controller CT is changed. Power is supplied to the second starter ST2 by drive control (on (closed) control). Then, at least during this power supply, as shown in FIG. 6A, the cut relay CR is controlled to be turned on (opened), and the first starter ST1 based on the operation of the ignition switch IGSW is performed. Power supply is prohibited. Specifically, during this period, even if the driver or the like (user) turns on the ignition switch IGSW (broken line in FIG. 6C), the power supply path is set by the cut relay CR. Since it is still cut off, power is not supplied to the first starter ST1 through the same path. That is, whether or not the switch IGSW is turned on or not, the two (first and second) starters ST1 and ST2 are not simultaneously operated (powered) (FIG. 6D). And the solid line in (e)), the situation where the power supply to these starters is insufficient (broken line in (d) and (e)) is avoided. Thus, in this system, the run return of the internal combustion engine is performed based on the drive of only the second starter ST2, so that the supply current to the second starter ST2 is performed during the run return. The amount is within an appropriate range (specified range) (solid line in FIG. 6 (d)), and the run return of the internal combustion engine is performed appropriately.

As described above, according to the electronic control unit and an idling stop control method according to this comparative example, so that effects such as is obtained.
(4) As a ISS controller CT that controls the idling stop operation of the second starter ST2, a cut relay that temporarily fixes the power supply path in which the ignition switch IGSW, which is an ignition / start switch of the internal combustion engine, is disposed in a cut-off state A configuration including a CR and a cut relay drive circuit CC (prohibiting means) is adopted. When the internal combustion engine is returned to the run state, the cut relay CR and the cut relay drive circuit CC prohibit power supply to the first starter ST1 based on the operation of the ignition switch IGSW. The drive of the second starter ST2 is controlled in cooperation with the relay SR2. As a result, when the internal combustion engine is returned to the run state, even if a manual power feeding operation, that is, an ignition switch IGSW is turned on at an incorrect timing, the above two (first and second) are accompanied by the erroneous operation. The situation in which the starters ST1 and ST2 of the two are erroneously simultaneously operated (powered) is preferably avoided. As a result, it is also possible to suitably avoid that the amount of current required for driving the starters is not supplied. In addition, in such a configuration, it is possible to avoid such a shortage of current only by adding the cut relay CR and the cut relay drive circuit CC (prohibiting means), so that the simple configuration of the system itself is maintained, and as a result, maintainability thereof. Will also be kept high. Further, regarding the control at the time of driving the cut relay CR, when the power supply based on the operation of the ignition switch IGSW is to be prohibited (prohibition period), the relay CR is turned on (open) (on (open) control). All that is required is simple control, and this controllability is kept very simple.

  (5) It is disposed between the switch IGSW and the first starter ST1, and prohibits power supply to the starter ST1 based on the operation of the switch IGSW with the open state, and from the open state to the closed state. The switching element that cancels the prohibition with the transition, that is, the one constituted by the cut relay CR is adopted as the prohibiting means. As a result, it can be easily realized in the form of the actual situation.

  (6) Further, if such a switching element (cut relay CR) having a switching element (transistor or the like) made of a semiconductor element is adopted, a highly reliable configuration can be achieved at low cost. It will be realized.

(Second Embodiment)
Next, a second embodiment in which the electronic control device and the idling stop control method according to the present invention are embodied will be described with reference to FIGS. FIG. 7 is a block diagram corresponding to FIG. 5. In FIG. 7, the same elements as those shown in FIG. I will omit the explanation.

  As shown in FIG. 7, this system is roughly divided into a first starter ST1 and a second starter ST2 (returning) that internally drive an internal combustion engine (engine) mounted on the vehicle and rotate it by itself. And an ISS controller CT for controlling the idling stop operation of these starters ST1 and ST2. The ISS controller CT includes starter relay drive circuits SC1 and SC2, a cut relay drive circuit CC, a microcomputer MC, and the like.

  Also in this case, the ignition switch IGSW, which is an ignition / start switch of the internal combustion engine, is opened / closed by the ISS controller CT in the power supply path of the first starter ST1, and in the power supply path of the second starter ST2. A starter relay SR2 to be driven is provided. However, here, a starter that is driven to open / close by the ISS controller CT is further provided to the power supply path of the first starter ST1 that joins the power supply path in which the ignition switch IGSW is disposed (merge point P1). A relay SR1 (first starter relay) is provided. Note that the power supply path of the first starter ST1 in which the ignition switch IGSW and the starter relay SR1 are disposed (specifically, the energization line of the relay coil) is the second starter ST2 in which the starter relay SR2 is disposed. The power supply path (the same energization line) is connected to a common power source (power supply voltage “+ B”).

  Thus, in this system, the first starter ST1 is controlled to operate / stop based on the on / off operation of the ignition switch IGSW, and the other second starter ST2 is independent of the operation of the switch IGSW. The operation / stop is controlled separately. Moreover, the first starter ST1 is further provided with the starter relay SR1, so that not only the ignition switch IGSW but also the starter relay SR1 separately and independently from the switch IGSW. The operation / stop is controlled.

Also in this embodiment, as in the first embodiment and the first and second comparative examples , a cut relay CR and a cut relay drive circuit CC are provided as prohibiting means. Specifically, the cut relay drive circuit CC is built in the ISS controller CT, and the cut relay CR is connected between the ignition switch IGSW and the first starter ST1, more specifically, a junction of the power supply path. It is arranged closer to the switch IGSW than P1. Then, with the continuous ON (open) state of the cut relay CR, power supply to the first starter ST1 based on the operation of the switch IGSW is prohibited, and the transition from the ON (open) state to the OFF (closed) state is performed. It is configured to lift the prohibition.

  Although not shown here, in this embodiment, the ISS controller CT includes an abnormality detection means for detecting an abnormality of the second starter ST2 (return starter). As this means, any configuration can be basically adopted as long as it can detect the abnormality of the starter ST2. Specifically, for example, the rotational speed of the internal combustion engine (engine) is appropriately set. A circuit to be taken in as a sensor signal corresponds to this abnormality detection means. Then, when adopting a method for detecting the abnormality of the second starter ST2 from the rotational speed of the internal combustion engine (engine), for example, when only the second starter ST2 is on-controlled, the rotational speed of the engine can be lowered. If it does not rotate at all, it can be determined that an abnormality has occurred in the starter ST2. In this way, for example, when the second starter ST2 or the starter relay SR2 cannot be used due to failure or wear, this abnormality detection means monitoring the starter ST2 can detect this. become. Further, in this case, when an abnormality of the second starter ST2 is detected by the abnormality detection means, the driver is notified of this by a notification means such as a warning lamp, that is, installed in the driver's seat when the abnormality is detected. If the lamp is lit (or flashing), the driver can recognize this and take appropriate measures (starter replacement, etc.).

  Next, an idling stop control method by this system, particularly a control mode of the cut relay CR will be described in detail with reference to FIG. In FIG. 8, (a) to (d) are time charts showing transitions of on / off states of the cut relay CR, the starter relay SR2, the starter relay SR1, and the ignition switch IGSW, and (e) and (f) ) Is a time chart showing the transition of the current amount in the power feeding path of the second starter ST2 and the first starter ST1.

  By the way, in this system, during normal times, the engine is returned from the idling stop state to the idling run state (run return) by the second starter ST2 (return starter). However, when the abnormality of the second starter ST2 is detected by the above-described abnormality detecting means, the driving of the starter ST2 is stopped, and the other first starter ST1 is caused to perform the run return of the engine. Yes. The starter (first starter ST1) is used for starting the internal combustion engine in normal times.

  Specifically, as shown in FIGS. 8A to 8F, in the normal time (when the second starter ST2 is normal), the starter described above has an operation according to the operation example shown in FIG. The problem of power shortage during driving is prevented in advance. That is, also in this embodiment, during normal operation (when the second starter ST2 is normal), power is supplied to the second starter ST2 while the cut relay CR is on (opened). Therefore, even if the ignition switch IGSW is turned on (broken line in FIG. 8 (d)) or not (solid line in (d)), the starters ST1 and ST2 are simultaneously operated (powered). This disappears (solid line in FIGS. 8E and 8F). As a result, the above-described situation where the power supplied to these starters is insufficient (broken lines in (e) and (f)) is avoided.

  On the other hand, when the abnormality detection means detects an abnormality of the second starter ST2 (for example, the starter relay SR2 is fixed off (opened)), the driving of the starter ST2 is stopped (specifically, with respect to the relay SR2). At the same time, the starter relay SR1 is turned on (closed) by the ISS controller CT. Then, when the starter relay SR1 is turned on (closed), the first starter ST1 replaces the second starter ST2 to return the engine to run, that is, cranking the starter (starter drive). Will be done. At this time, the intensive overcurrent with respect to a part of the above-described feeding path (common part after joining) is suppressed by the operation according to the operation example shown in FIG. 3 to the first starter ST1. The supply current amount is within an appropriate range (specified range). That is, also in this embodiment, as shown in FIGS. 8A and 8C, power is supplied to the first starter ST1 in a state where the cut relay CR is controlled to be on (opened). For this reason, even if the ignition switch IGSW is turned on (broken line in FIG. 8 (d)) or not (solid line in (d)), the power supply path of the starter ST1 (particularly after the merge) On the other hand, the current (overcurrent) exceeding the above-mentioned specified value is not supplied, and the supply current amount in the same path and the first starter ST1 is within the specified range.

  As described above, according to the electronic control device and the idling stop control method according to this embodiment, in addition to the effects similar to the effects (1) to (6) or the effects equivalent thereto, the following is further performed. Effects can also be obtained.

  (7) As an ISS controller CT that controls the idling stop operation of the first starter ST1 and the second starter ST2 (return starter), a starter relay SR2 (return starter relay) that intermittently supplies power to the second starter ST2. And an abnormality detection means for detecting an abnormality of the starter ST2. Thus, in normal times, the second starter ST2 is caused to return from the idling stop state to the idling run state (run return) of the internal combustion engine. On the other hand, when the abnormality is detected by the abnormality detection means, the starter ST2 Is stopped, and the other first starter ST1 is made to return the engine to run. As a result, even if the second starter ST2 or the starter relay SR2 that is normally used cannot be used due to, for example, failure or wear, this is detected by the abnormality detection means as an operation abnormality of the second starter ST2. With this detection, the normal first starter ST1 properly returns the engine to run.

  (8) Further, the first starter ST1 is configured such that its operation / stop is controlled based on the on / off operation of the ignition switch IGSW, and for the other second starter ST2, The operation / stop is controlled separately from the operation of the ignition switch IGSW. As a result, during the normal run return by the second starter ST2, even if the manual power feeding operation, that is, the ignition switch IGSW is turned on at the wrong timing, A situation where the starters ST1 and ST2 are erroneously simultaneously operated (powered) is preferably avoided. As a result, various problems resulting from temporary excessive power consumption such as the problem of power shortage during the starter driving described above can be prevented in advance.

  Note that when the abnormality of the second starter ST2 (return starter) is detected by the abnormality detection means, the drive of the starter ST2 is not simply stopped, but the drive is further prohibited after being stopped. If so, it is possible to further increase the security level.

( Third embodiment)
Next, with reference to FIG. 9 and FIG. 10, a third embodiment that embodies the electronic control device and the idling stop control method according to the present invention will be described. FIG. 9 is a block diagram corresponding to FIG. 7. In FIG. 9, the same elements as those shown in FIG. I will omit the explanation.

As shown in FIG. 9, this system has a configuration similar to that of the system of the second embodiment illustrated in FIG. 7. However, in this embodiment, the above-described cut relay CR is between the ignition switch IGSW and the first starter ST1, and more particularly than the junction P1 between the feed path by the starter relay SR1 and the feed path by the switch IGSW. It is disposed closer to the first starter ST1. Thus, during the period in which the cut relay CR is ON (opened), the power supply path in which the starter relay SR1 is provided together with the power supply path in which the ignition switch IGSW is provided by the cut relay CR. Is also fixed in the cut-off state, and power supply to the first starter ST1 based on the starter relay SR1 is also prohibited.

  Hereinafter, the control mode of the cut relay CR will be described in detail with reference to FIG. 10A to 10F used for the description here are time charts corresponding to FIGS. 8A to 8F.

  As shown in FIG. 10 (b), in this embodiment, when the internal combustion engine is returned from the idling stop state to the idling run state (run return), the starter relay SR2 by the ISS controller CT is used. In this drive control (on (closed) control), power is supplied to the second starter ST2. At least during this power supply, as shown in FIG. 10A, the cut relay CR is controlled to be on (opened), and the second starter ST2 based on the operation of the ignition switch IGSW is controlled. Power supply is prohibited.

  In addition, at this time, the cut relay CR is provided closer to the first starter ST1 than the junction P1 (FIG. 9) of the power supply path, so that the ignition switch is turned on (opened) to drive the ignition switch. Together with the power supply path in which the IGSW is disposed, the power supply path in which the starter relay SR1 is disposed is also fixed in the cut-off state. For this reason, not only when the ignition switch IGSW is operated by mistake (broken line in FIG. 10 (d)), but also when the starter relay SR1 cannot be used due to failure or wear (for example, as shown in FIG. 10 (c)). Also, the situation where the starters ST1 and ST2 are simultaneously operated (powered) (broken line in FIG. 10E) is avoided. In other words, the above-described problems such as power shortage during starter driving can be prevented more reliably. This is also preferable for the overcurrent with respect to the first starter ST1 as indicated by a broken line in FIG. 10 (f) (specifically, a broken line in the period when the first starter is fixed ON). It will be avoided.

  As described above, according to the electronic control device and the idling stop control method according to this embodiment, in addition to the effects similar to the effects (1) to (8) or the effects similar thereto, Effects can also be obtained.

  (9) During the period when the cut relay CR as the prohibiting means is controlled to be on (opened), the start relay SR1 is arranged by the cut relay CR together with the power supply path where the ignition switch IGSW is arranged. The power supply path is also fixed in a cut-off state, and power supply to the first starter ST1 based on the starter relay SR1 is also prohibited. As a result, the two (first and second) starters that can be caused not only by the erroneous operation of the ignition switch IGSW but also by the failure / consumption of the starter relay SR1 (for example, on (closed) fixation), etc. This is suitably avoided even when ST1 and ST2 are simultaneously powered and activated. That is, by adopting such a configuration, it is possible to more reliably prevent various problems including the above-described problem of power shortage during starter driving. More specifically, as shown in FIG. 10F, particularly during the period “when the first starter is fixed to ON” in the same figure, this is also preferably avoided for the overcurrent to the first starter ST1. It becomes like this.

  (10) Further, in this embodiment, the cut relay CR is placed between the ignition switch IGSW and the first starter ST1, particularly closer to the first starter ST1 than the junction P1 (FIG. 9) of the power feeding path. By being arranged, the above-described configuration can be easily realized in conformity with the actual situation.

( Fourth embodiment)
Next, with reference to FIG. 11 and FIG. 12, a fourth embodiment that embodies the electronic control unit and the idling stop control method according to the present invention will be described. FIG. 11 is a block diagram corresponding to FIG. 9. In FIG. 11, the same elements as those shown in FIG. 9 are denoted by the same reference numerals, and duplication of these elements is shown. I will omit the explanation.

As shown in FIG. 11, this system has a configuration roughly corresponding to the system of the third embodiment illustrated in FIG. 9. However, in this system, in addition to the ISS controller CT, a cut relay drive controller CCT (auxiliary control device) is further provided so as to be communicably connected to the ISS controller CT. Specifically, the ISS controller CT mainly includes a starter relay drive circuit SC1 and SC2 and a microcomputer MC that controls the drive of the starter relays SR1 and SR2 in cooperation with these circuits. Configured. On the other hand, the cut relay drive controller CCT is mainly configured to include a cut relay drive circuit CC and a microcomputer CMC for controlling the drive of the cut relay CR in cooperation with this circuit. ing. Thus, the drive control of the cut relay CR is performed by the cut relay drive controller CCT through bidirectional communication of these electronic control devices (or unidirectional access from the controller CT to the controller CCT). It has become. For example, CAN (Controller Area Network) communication can be used as a communication method between these electronic control devices.

  Hereinafter, the control mode of the cut relay CR will be described in detail with reference to FIG. Note that FIGS. 12A to 12F are also time charts corresponding to FIGS. 8A to 8F.

  As shown in FIGS. 12A to 12F, in this embodiment, even when an abnormality occurs in the ISS controller CT, the cut is connected so as to be communicable with the ISS controller CT. The opening / closing drive of the cut relay CR is controlled as desired by the relay drive controller CCT. For this reason, even if the ignition switch IGSW is erroneously turned on at this time (broken line in FIG. 12D), the first starter ST1 malfunctions due to the erroneous operation of the ignition switch IGSW (FIG. 12F). There is no such thing as a broken line).

  As described above, according to the electronic control device and the idling stop control method according to this embodiment, in addition to the effects similar to the effects (1) to (10) or the effects similar thereto, Effects can also be obtained.

  (11) A cut relay drive controller CCT (auxiliary control device) for assisting the control by the ISS controller CT is further provided so as to be communicably connected to the ISS controller CT. The drive control of the cut relay CR was performed. Thereby, the inconvenience associated with the erroneous operation of the ignition switch IGSW can be suitably avoided with a higher security level.

( Fifth embodiment)
Next, with reference to FIG. 13 and FIG. 14, a fifth embodiment that embodies the electronic control unit and the idling stop control method according to the present invention will be described. FIG. 13 is a block diagram corresponding to FIG. 7, and in FIG. 13, the same elements as those shown in FIG. I will omit the explanation.

As shown in FIG. 13 , this system has a configuration similar to that of the system of the second embodiment illustrated in FIG. 7. However, in this system, instead of the ISS controller CT (FIG. 7), the first controller CT1 (auxiliary control device) and the second controller CT2 that are communicably connected to each other are adopted. Specifically, the first controller CT1 largely controls the starter relay drive circuit SC1 and the cut relay drive circuit CC, and further controls the drive of the starter relay SR1 and the cut relay CR in cooperation with these circuits. The microcomputer MC1 and the like are configured. On the other hand, the second controller CT2 is mainly configured to include a starter relay drive circuit SC2 and a microcomputer MC2 for controlling the drive of the starter relay SR2 in cooperation with this circuit. Thus, the first and second starters ST1 and ST2 and further the cut relay CR are controlled as desired through bidirectional (or unidirectional) communication between these electronic control units. In this case as well, as a communication method between these electronic control devices, for example, CAN communication can be used.

  Hereinafter, the control mode of the cut relay CR will be described in more detail with reference to FIG. 14A to 14F are also time charts corresponding to FIGS. 8A to 8F.

  As shown in FIGS. 14A to 14F, in this embodiment, even when an abnormality occurs in the second controller CT2, the second controller CT2 connected to be communicable with the second controller CT2. The open / close drive of the starter relay SR1 and the open / close drive of the cut relay CR are controlled as desired by one controller CT1. For this reason, even if the ignition switch IGSW is erroneously turned on at this time (broken line in FIG. 14D), the first starter ST1 malfunctions due to an erroneous operation of the ignition switch IGSW (FIG. 14F). The starter ST1 is properly controlled by the first controller CT1. That is, according to the above-described system according to this embodiment, not only when an abnormality occurs in the second starter ST2 or the starter relay SR2, but also when an abnormality such as a failure occurs in the second controller CT2 itself that controls them. In addition, it becomes possible to continue to maintain appropriate control in a flexible manner.

  As described above, according to the electronic control device and the idling stop control method according to this embodiment, in addition to the effects similar to the effects (1) to (8) or the effects similar thereto, Effects can also be obtained.

  (12) A first controller CT1 (auxiliary control device) that assists the control by the second controller CT2 is further provided so as to be communicably connected to the second controller CT2, and the first controller CT1 includes a starter relay SR1, and The drive control of the cut relay CR was performed. As a result, not only when an abnormality occurs in the second starter ST2 or the starter relay SR2, but also when an abnormality such as a failure occurs in the second controller CT2 itself that controls them, an appropriate response can be flexibly handled. It becomes possible to continue to maintain control.

( Modification )
In addition, you may change each said embodiment and each comparative example as follows.
For example, as shown in FIG. 15, the first and second starters of the configuration of the first comparative example illustrated in FIG. 4 are the same as in the system of the second embodiment illustrated in FIG. Even when configured by ST1 and ST2, for example, the effects according to the effects (1) to (8) can be obtained by the operation according to the operation example shown in FIG.

  In this case as well, as shown in FIG. 16, for example, the cut relay CR is disposed between the ignition switch IGSW and the first starter ST1, particularly closer to the first starter ST1 than the junction P2 of the power supply path. By doing so, effects according to the effects (1) to (10) can be obtained. That is, not only the erroneous operation of the ignition switch IGSW but also the above two (first) that may be caused by failure / consumption of the ISS controller CT (for example, current supply to the starter relay SR1 at an incorrect timing), etc. Also, the situation in which the second and second starters ST1 and ST2 are simultaneously fed and operated is preferably avoided.

Further, with respect to the electronic control device illustrated in FIGS. 15 and 16 as well, if an auxiliary control device similar to that illustrated in FIG. 11 or FIG. 13 is employed, the effect of (11) above can be achieved. The effect according to the above or the effect according to the effect (12) can be obtained.
In the fourth embodiment (FIG. 11) and its modifications, the ISS controller CT may be provided with a cut relay drive circuit CC. That is, during normal times, the cut relay CR is controlled by the controller CT while the cut relay drive controller CCT monitors the presence or absence of the abnormality of the ISS controller CT. Then, only when the abnormality of the ISS controller CT is detected by the cut relay drive controller CCT, the cut relay drive controller CCT performs drive control of the cut relay CR instead of the controller CT. . If such a configuration is adopted, the idling stop control of the starter is performed in the normal time (normal time) without communication between the electronic control units, thereby further increasing the security level.

In each of the above-described embodiments , comparative examples, and modifications thereof, for the sake of convenience of explanation, only a system including one or two starters that are highly likely to be practically used is mentioned, but three or more starters are provided. The present invention can be similarly applied to the configuration.

In the second to fifth embodiments and the modifications thereof, the configuration in which the first and second starters ST1 and ST2 are connected to a common power source is mentioned. Even when they are connected, the same effects as the effects (1) to (3), the effects (7) to (12), or the similar effects can be obtained.

-In addition, in each of the above-described embodiments , comparative examples, and modifications thereof, if a plurality of (for example, two) cut relays CR are connected in series and one of them is broken (fixed closed) Even if it exists, it becomes the structure which can respond to this flexibly.

In addition, the previous FIG. 3, FIG. 6, FIG. 8, FIG. 10, FIG. 12, and FIG. 14 exemplify an example of the operation of the electronic control device or system according to each embodiment and each comparative example. It's just a thing. That is, the operation mode of the electronic control device according to the present invention is not limited to the operation mode shown here. For example, it is not essential that the cut relay CR is turned on simultaneously with the start control of the starter relays SR, SR1, and SR2, and a manual power feeding operation at an incorrect timing, that is, a timing at which an erroneous operation of the ignition switch IGSW is expected. It is enough to be done prior to.

In each of the above-described embodiments , comparative examples, and modifications thereof, a starter switch that is disposed in the starter power supply path and is turned off / on (manually operated) to intermittently supply power to the starter For example, any switch that is not limited to the ignition switch IGSW described above can be used. For example, even if this is a switch or the like provided for the purpose of starter driving in an emergency, the present invention can be applied in the same manner although there is some difference in its significance.

1 is a block diagram schematically showing a schematic configuration of an electronic control device and an idling stop control method according to a first embodiment of the present invention together with a system according to the first embodiment. The circuit diagram which shows the detail of a structure of the said electronic controller together with the system which concerns on the said 1st Embodiment. (A)-(d) is a time chart which shows an example of the control aspect about the idling stop control method by the electronic controller which concerns on the 1st Embodiment. The block diagram which shows typically schematic structure of the electronic controller about the 1st comparative example with the system which concerns on the comparative example . The block diagram which shows typically the schematic structure of the electronic control apparatus about the 2nd comparative example with the system which concerns on the comparative example . (A)-(e) is a time chart which shows an example of the control mode about the idling stop control method by the electronic control unit concerning the 2nd comparative example . The block diagram which shows typically schematic structure of the electronic controller concerning 2nd Embodiment of the electronic controller and idling stop control method concerning this invention with the system which concerns on the embodiment. (A)-(f) is a time chart which shows an example of the control aspect about the idling stop control method by the electronic controller which concerns on the 2nd Embodiment. The block diagram which shows typically schematic structure of the electronic controller concerning 3rd Embodiment of the electronic controller and idling stop control method concerning this invention with the system which concerns on the embodiment. (A)-(f) is a time chart which shows an example of the control aspect about the idling stop control method by the electronic controller which concerns on the 3rd Embodiment. The block diagram which shows typically schematic structure of the electronic controller concerning 4th Embodiment of the electronic controller and idling stop control method concerning this invention with the system which concerns on the embodiment. (A)-(f) is a time chart which shows an example of the control aspect about the idling stop control method by the electronic controller which concerns on the 4th Embodiment. The block diagram which shows typically schematic structure of the electronic controller concerning the 5th Embodiment of the electronic controller and idling stop control method concerning this invention with the system which concerns on the embodiment. (A)-(f) is a time chart which shows an example of the control aspect about the idling stop control method by the electronic controller which concerns on the 5th Embodiment. The block diagram which shows typically the schematic structure of the electronic controller about the modification which combined embodiment with the 1st comparative example . The block diagram which shows typically the schematic structure of the electronic controller about the modification which combined embodiment with the 1st comparative example . The block diagram which shows typically the outline | summary about an example of the conventional electronic control apparatus and an idling stop control method. The circuit diagram which shows the detail of a structure of the vehicle-mounted control system shown in FIG. The block diagram which shows typically the outline | summary about another example of the conventional vehicle-mounted control system. (A)-(c) is a time chart which shows an example of the control aspect about the idling stop control method by the vehicle-mounted control system shown in FIG.17 and FIG.18. The block diagram which shows typically the outline | summary about an example of a vehicle-mounted control system provided with two starters as a control object. (A)-(d) is a time chart which shows an example of the control aspect about the idling stop control method by the vehicle-mounted control system shown in FIG.

Explanation of symbols

  CC: Cut relay drive circuit, CCT: Cut relay drive controller, CMC, MC, MC1, MC2 ... Microcomputer, CR ... Cut relay, CRC, RC, SRC ... Relay coil, CRW, RW, SRW ... Relay switch, CT ISS controller, IGSW ... ignition switch, M ... starter motor, R1, R2, R11, R12 ... resistance element, SC, SC1, SC2 ... starter relay drive circuit, SR, SR1, SR2 ... starter relay, ST ... starter, ST1 ... first starter, ST2 ... second starter, T, T10 ... transistor.

Claims (17)

A starter that externally drives the in-vehicle internal combustion engine to rotate the engine on its own, and a starter that is arranged in the power supply path of the starter and that is turned off / on to intermittently supply power to the starter A starter relay for intermittently supplying power to the starter based on being opened / closed by being disposed in the power supply path of the starter that joins the switch and the power supply path in which the starter switch is arranged In an on-vehicle control system configured to include: an electronic control device that controls an idling stop operation of the starter by opening / closing the starter relay separately from an off / on operation of the starter switch;
A power supply path provided with the starter switch is temporarily fixed in a cut-off state, and prohibiting means for prohibiting power supply to the starter based on the operation of the starter switch during this period is provided, and the internal combustion engine is in an idling stop state. When returning from the idling run state to the starter switch, the prohibiting means prohibits power supply to the starter based on the operation of the starter switch, and in this state, in cooperation with the starter relay, An electronic control device characterized by controlling driving. The electronic control device according to claim 1.
In addition to the starter, the system includes a return starter that drives the internal combustion engine from the outside, and is disposed in a power supply path of the return starter and is driven to open / close. A return starter relay for intermittently supplying power to the return starter, and an abnormality detection means for detecting an abnormality of the return starter,
In the system, in normal operation, the return starter is caused to return from the idling stop state to the idling run state in cooperation with the return starter relay, while the abnormality detection means When the abnormality is detected by the electronic control unit, the drive of the return starter is stopped, and the other starter is caused to return from the idling stop state to the idling run state of the internal combustion engine. . The starter is controlled to operate / stop based on the on / off operation of the starter switch, and the other return starter is controlled to operate / stop separately from the operation of the starter switch. The electronic control device according to claim 2. The prohibiting means shuts off the power supply path provided with the starter relay together with the power supply path provided with the starter switch during a period during which power supply to the starter based on the operation of the starter switch is prohibited. The electronic control device according to claim 3, wherein power supply to the starter based on the starter relay is also prohibited. The prohibiting means is between the starter switch and the starter, and is a junction point between a power feeding path where the starter switch is arranged and a power feeding path where the starter relay is arranged, or closer to the starter than the junction point. And a switching element that prohibits power supply to the starter based on the operation of the starter switch and driving of the starter relay with a continuous open state, and cancels the prohibition with a transition from the open state to the closed state. The electronic control device according to claim 4 configured. The electronic control device according to claim 4 or 5,
An electronic control device, further comprising an auxiliary control device that assists control by the electronic control device in a communicably connected manner, and causing the auxiliary control device to perform drive control of the prohibiting means. The prohibiting means is disposed between the starter switch and the starter and prohibits power supply to the starter based on the operation of the starter switch in a continuous open state, and from the open state to the closed state. The electronic control device according to any one of claims 1 to 3, wherein the electronic control device includes a switching element that cancels the prohibition with a transition. The electronic control device according to claim 5, wherein the switching element includes a switching element made of a semiconductor element. In the electronic control device according to any one of claims 2 to 8,
An electronic control device comprising: an auxiliary control device that assists control by the electronic control device in a communicably connected manner, and causing the auxiliary control device to perform drive control of the starter relay and the prohibiting means. The electronic control device according to claim 1, wherein the starter switch is an ignition switch that starts the engine as an ignition / start switch of the on-vehicle internal combustion engine. Based on the first and second starters for driving the in-vehicle internal combustion engine from the outside in order to rotate the in-vehicle internal combustion engine by itself, and being disposed in the power supply path of the first starter and being turned off / on. A starter switch for intermittently supplying power to the first starter, and a power supply path for the second starter connected to a power source common to the power supply path for the first starter in which the starter switch is disposed. And a starter relay configured to intermittently supply power to the second starter based on being opened / closed and being opened / closed, wherein the starter relay is opened / closed. In the electronic control device for controlling the idling stop operation of the second starter,
A power supply path in which the starter switch is disposed is temporarily fixed in a cut-off state, and prohibiting means for prohibiting power supply to the first starter based on the operation of the starter switch only during this period; When returning from the idling stop state to the idling run state, power supply to the first starter based on the operation of the starter switch is prohibited by the prohibiting means, and in this state, cooperation with the starter relay is prohibited. Based on the control of the drive of the second starter ,
In addition to the starter switch, the system is disposed in the power supply path of the first starter that is also connected to the common power source and is driven to open / close. A first starter relay for intermittently supplying power to
In the system, the prohibiting unit is configured to supply the first starter switch together with the power supply path in which the starter switch is disposed during a period in which power supply to the first starter is prohibited based on the operation of the starter switch. An electronic control device characterized in that a power supply path provided with a starter relay is also fixed in a cut-off state, and power supply to the first starter based on the first starter relay is also prohibited . The prohibiting means is located between the starter switch and the first starter, and is a junction or a junction of a power supply path where the starter switch is arranged and a power supply path where the first starter relay is arranged The first starter is disposed closer to the first starter than the point, and in a continuous open state, operation of these starter switches and power supply to the first starter based on driving of the first starter relay are prohibited and the open state The electronic control device according to claim 11 , wherein the electronic control device is configured by a switching element that cancels the prohibition upon transition from a closed state to a closed state. The electronic control device according to claim 11 or 12 ,
An electronic control device, further comprising an auxiliary control device that assists control by the electronic control device in a communicably connected manner, and causing the auxiliary control device to perform drive control of the prohibiting means. The electronic control device according to claim 12 , wherein the switching element includes a switching element made of a semiconductor element. The electronic control device according to any one of claims 11 to 14 ,
In addition to the starter switch, the system is disposed in the power supply path of the first starter that is also connected to the common power source and is driven to open / close. A first starter relay for intermittently supplying power to
In this system, an auxiliary control device that assists the control by the electronic control device is connected in a communicable manner, and the auxiliary control device controls the drive of the first starter relay and the prohibiting means. An electronic control device characterized by that. The electronic control device according to any one of claims 11 to 15 , wherein the starter switch is an ignition switch that starts the engine as an ignition / start switch of the in-vehicle internal combustion engine. A starter that externally drives the in-vehicle internal combustion engine to rotate the engine on its own, and a starter that is arranged in the power supply path of the starter and that is turned off / on to intermittently supply power to the starter A starter relay configured to intermittently supply power to the starter based on being opened / closed by being disposed in the power supply path of the starter that joins the switch and the power supply path in which the starter switch is arranged In an idling stop control method for controlling an idling stop operation of the starter based on an off / on operation of the starter switch and an open / close drive of the starter relay,
The system further includes a prohibiting means for temporarily fixing the power supply path in which the starter switch is disposed in a cutoff state and prohibiting power supply to the starter based on the operation of the starter switch only during this period. When the internal combustion engine is returned from the idling stop state to the idling run state, the prohibiting means prohibits power supply to the starter based on the operation of the starter switch, and in this state, the starter relay is driven. And controlling the drive of the starter.

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