JP4992884B2 - Engine restart control device - Google Patents

Description

  The present invention relates to an engine restart control device applied to an idle stop start vehicle that automatically stops an engine during idling and restarts the engine after the automatic stop.

2. Description of the Related Art Conventionally, an idle stop start vehicle (hereinafter referred to as an idle control vehicle) has been developed and put into practical use in which when a predetermined condition is satisfied while a vehicle is stopped, the operation of the engine is stopped to improve fuel consumption and exhaust gas emission.
Among such idle control vehicles, a vehicle equipped with a manual transmission (MT) is generally based on various types of vehicle information including driver clutch operation information, transmission shift operation information, accelerator operation information, and vehicle speed information. Thus, the driver's intention to stop or start is determined, and the engine is automatically stopped or restarted.

As a known example of such an engine restart control device applied to an idle control vehicle that automatically stops the engine during idling or restarts the engine after the automatic stop, for example, Patent Document 1 is cited. it can. In this patent document 1, it is detected that the service brake brake and the parking brake brake are operating based on the detection information from the service brake brake sensor and the parking brake brake sensor, and from the neutral position sensor. If the first clutch switch is turned on in a state where the gear position is detected to be neutral based on the detection information, the second clutch switch is turned on thereafter regardless of the detection information from the neutral position sensor. The engine is restarted on the condition.
JP 2002-364404 A

In the engine restart control device disclosed in Patent Document 1, when the neutral position sensor is abnormal or malfunctioned, the engine does not restart even when the second clutch switch is turned on. There was a problem that the restart of the system would be hindered.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an engine restart control device that can more reliably restart an idle controlled vehicle after automatic stop.

In order to achieve the above-described object, the engine restart device according to the present invention automatically stops the engine when an automatic stop condition is satisfied while the engine is operating, and the restart condition is satisfied while the engine is automatically stopped. Then, an engine restart control device for an idle stop start vehicle for restarting the engine, the first clutch pedal position detecting means for detecting a first state where the clutch pedal is depressed, and until the clutch is disconnected Detects a failure of a second clutch pedal position detecting means for detecting a second state where the clutch pedal is depressed, a neutral position detecting means for detecting a state where the transmission gear is in a neutral position, and a neutral position detecting means. the engine and failure determining means, and the restart condition is satisfied that And a engine restart means for restarting the said engine restart means, the transmission by the neutral position detecting means when the first state is detected by the first clutch pedal position detection means The engine is restarted when it is detected that the gear position is neutral, and when a failure of the neutral position detection means is detected by the failure determination means, the second clutch pedal position detection means detects the second clutch pedal position detection means. The engine is restarted when the state 2 is detected .

  According to the present invention, when the clutch pedal position is detected by the first clutch pedal position detecting means, the clutch pedal is depressed until the clutch is disconnected by the second clutch pedal position detecting means. Is detected, and the engine is automatically restarted when a failure is detected in the neutral position detecting means for detecting a state in which the transmission gear position is switched to neutral. For this reason, even if a failure occurs in the neutral position detecting means, the engine can be restarted only by operating the clutch pedal, that is, depressing the clutch pedal until the clutch is disengaged from a state where the clutch pedal is lightly depressed. Therefore, the idle control vehicle can be more reliably restarted after the automatic stop.

FIG. 1 is a block diagram showing a configuration of an engine restart control apparatus according to an embodiment of the present invention.
This engine restart control device includes an ECU 1 that is a microcomputer that controls each part including an automobile engine.
The ECU 1 includes an engine automatic stop unit 2, an engine restart unit 3, a failure determination unit 6 and an engine stop mode continuation determination unit 7 for realizing an idle stop control system.
The engine restart unit 3 includes a normal auto start unit 4 and a forced auto start unit 5.
An automatic stop condition is set for the engine automatic stop means 2, a normal engine restart condition is set for the normal auto start means 4 of the engine restart means 3, and a forced auto start means 5 of the engine restart means 3 is forced. The engine restart condition is set.
When the automatic stop condition is satisfied, the engine is automatically stopped, and when the normal engine restart condition or the forced engine restart condition is satisfied, the engine is automatically restarted.
The failure determination means 6 performs an abnormality determination process for a device including a neutral position sensor 16 (to be described later) constituting the idle stop control system.
The engine stop mode continuation determination means 7 determines whether or not the engine automatic stop state continues for a predetermined time.
The ECU 1 includes an ignition key sensor 11, a first clutch switch (first clutch pedal position detecting means) 12, a second clutch switch (second clutch pedal position detecting means) 13, a brake vacuum sensor 14, an engine hood switch 15, a neutral position. Various detectors including a sensor (neutral position detection means) 16, a current sensor 17, a battery temperature sensor 18, an engine water temperature sensor 19 and an idle stop control main switch 20, and an engine stop including a starter motor 22 and a fuel injection control means 23 Various devices controlled and driven by the ECU 1 for restarting are connected.

Further, in this restart control device, the ECU 1 transmits / receives CAN communication information 21 by a CAN (Controller Area Network) communication system.
The CAN communication information 21 includes, for example, front and left wheel speed information for calculating the vehicle speed, an idle stop non-permission signal for detecting an idle stop prohibition request, a seed belt reminder signal for detecting the absence of a driver seat belt, and an idle stop control system. Various output signals transmitted from the ECU 1 in relation to the control of the.

The ignition key sensor 11 is a sensor that detects whether an ignition key is on or off.
The first clutch switch 12 is a switch that detects depression of the clutch pedal. The first clutch switch 12 is set so as to be turned on when the driver slightly depresses the clutch pedal, and detects depression of the clutch pedal.
The second clutch switch 13 is a switch for determining whether or not the clutch is completely disconnected, and is set so as to be turned on when the driver depresses the clutch pedal to a position (back) where the clutch is disconnected. Has been.
The brake vacuum sensor 14 is a sensor that detects a brake negative pressure, and detects a brake negative pressure when the driver depresses the brake pedal.
The engine hood switch 15 is a switch that detects a state where the hood is opened, and is turned on when the hood is opened.
The neutral position sensor 16 is a sensor that detects that the position of the manual transmission is in a neutral state.
The current sensor 17 is a sensor that detects the charge / discharge current of the in-vehicle battery.
The battery temperature sensor 18 is a sensor that detects the ambient temperature of the in-vehicle battery.
The engine water temperature sensor 19 is a sensor that detects the temperature of engine cooling water.
The idle stop control main switch 20 is a switch for switching between operation and non-operation of the idle stop control.
The starter motor 22 is a motor that rotates the engine from the outside when starting the engine.
The fuel injection control means 23 is a device that controls injection of fuel supplied to the combustion chamber of the engine.

  The engine automatic stop means 2 and the engine restart means 3 of the ECU 1 include an ignition key sensor 11, a first clutch switch 12, a second clutch switch 13, a brake vacuum sensor 14, an engine hood switch 15, a neutral position sensor 16, and a current sensor 17. Based on various vehicle information detected by various detectors including a battery temperature sensor 18, an engine water temperature sensor 19 and an idle stop control main switch 20, an engine stop control signal and an engine restart control signal are set, and fuel injection control is performed. The engine stop control signal and the engine restart control signal are output to the means 23 and the starter motor 22.

Next, the operation will be described.
In this engine restart control device, the ECU 1 determines whether or not the idle stop control main switch 20 is set to ON. If the idle stop control main switch 20 is set to ON, the ISS (Idling Stop and (Start) is shifted to a standby state where it can be executed. This standby state is the most basic condition for performing ISS, and it is assumed that the engine automatic stop condition and the restart condition described below are both in this standby state.

FIG. 2 and FIG. 3 are flowcharts showing a process for determining whether an automatic stop (idle stop) condition of the engine automatic stop means 2 is satisfied in the engine restart control device of this embodiment.
Hereinafter, the engine automatic stop operation in the idle stop control system will be described with reference to this flowchart.
First, the ECU 1 determines whether “the idle stop control main switch 20 is set to ON” (step S1), and returns when the idle stop control main switch 20 is not set to ON.
On the other hand, if the idle stop control main switch 20 is set to ON, it shifts to a standby state in which ISS can be executed.
After the transition to the standby state where ISS can be executed, it is subsequently determined whether the engine stop mode is the next automatic stop condition (step S4).

  If it is determined in step S4 that the engine is in the engine stop mode, that is, the engine is stopped, the process returns. On the other hand, if it is determined in step S4 that the engine is not in the engine stop mode, that is, the engine is not stopped and is rotating, it is determined whether the idle switch is on, which is the next automatic stop condition ( Step S7).

  If it is determined in step S7 that “the idle switch is off”, the process returns. On the other hand, if it is determined in step S7 that “the idle switch is ON”, it is determined whether the shift lever of the manual transmission is in the neutral state, which is the next automatic stop condition (step S10).

  If it is determined in step S10 that “the state of the manual transmission is not in the neutral state, the shift lever is not in the neutral state”, the process returns. On the other hand, if it is determined in step S10 that “the shift lever of the manual transmission is in the neutral state”, the next automatic stop condition is “the first clutch switch 12 is in the clutch pedal released state (the state in which it is returned to the normal position). ) ”Is determined (step S13).

If it is determined in step S13 that "the first clutch switch 12 is not in the clutch pedal release state", the process returns. On the other hand, if it is determined in step S13 that “the first clutch switch 12 is in the clutch pedal release state”, the next automatic stop condition “whether the vehicle speed sensor is not abnormal and indicates a stop state” is determined. (Step S16).
Information about whether or not the vehicle speed sensor is abnormal or whether or not the vehicle speed sensor indicates a stop state is obtained from the CAN communication information 21.

  If it is determined in step S16 that "the vehicle speed sensor is abnormal or the vehicle speed sensor does not indicate a stop state", the process returns. On the other hand, if it is determined in step S16 that the vehicle speed sensor is not abnormal and indicates a stopped state, it is determined whether the engine water temperature exceeds a predetermined temperature, which is the next automatic stop condition (step S19). ).

  If it is determined in step S19 that “the engine water temperature does not exceed the predetermined temperature”, the process returns. On the other hand, if it is determined in step S19 that “the engine water temperature is equal to or higher than the predetermined temperature”, the next automatic stop condition “whether the brake negative pressure is less than the predetermined value” is determined (step S22).

  If it is determined in step S22 that “the brake negative pressure is greater than the predetermined value”, the process returns. On the other hand, if it is determined in step S22 that “the brake negative pressure is smaller than the predetermined value (the brake pedal is depressed)”, the next automatic stop condition “A / C idle stop permission determination is permitted” is determined. A determination is made (step S25).

  This “A / C idle stop permission determination” is a determination process for permission / prohibition of idle stop performed by the ECU 1, and ensures air conditioning performance related to cooling and the like, and air conditioning performance related to heating performance. In some cases, the determination conditions for permission / prohibition of idle stop performed by the ECU 1 are different.

  If it is determined in step S25 that "A / C idle stop permission determination is not permitted", the process returns. On the other hand, if it is determined in step S25 that "A / C idle stop permission determination is permitted", the next automatic stop condition "Idle stop prohibition electric load condition is not satisfied" is determined (step S25). S28).

  If it is determined in step S28 that "the idle stop prohibition electric load condition is satisfied", the process returns. On the other hand, if it is determined in step S28 that “the idle load prohibition electric load condition is not satisfied”, the next automatic stop condition is “MIL (Malfunction Indicator Lamp) by a failure diagnosis system (failure state display means) at engine start”. "When the temporary fault code is stored (when a failure diagnosis result is obtained by the failure diagnosis system) or when the MIL lighting is requested" regarding the failure that is turned on (lamp lighting indicating failure status, failure status display) A determination is made (step S31).

If it is determined in step S31 that “it is not a temporary failure code storage time but a MIL lighting request time”, the process returns. On the other hand, if it is determined in step S31 that "it is other than temporary fault code storage or MIL lighting request", the next automatic stop condition "Idle stop control system temporary abnormality or idle stop control system abnormality" is determined. A determination is made (step S34).
The idle stop control system temporary abnormality and idle stop control system abnormality determination is performed by an idle stop control including a neutral position sensor 16, a first clutch switch 12, a second clutch switch 13, a brake vacuum sensor 14, a current sensor 17, and a battery temperature sensor 18. An abnormality of the idle stop control system is determined for devices constituting the system.

  In step S34, it is determined that “the engine is not temporarily idle stop control system abnormality”, and if it is determined that the system is “idle stop control system abnormality”, the process returns. On the other hand, if it is determined in step S34 that "idle stop control system temporary abnormality" or "idle stop control system abnormality" is not established, the next automatic stop condition is "whether the seat belt of the driver's seat is attached or not" Is determined (step S37).

  If it is determined in step S37 that "the driver's seat belt is not in a worn state", the process returns. On the other hand, if it is determined in step S37 that "the seat belt of the driver's seat is in a state of being attached", the next automatic stop condition "whether the engine hood switch 15 is closed" is determined (step S37). S340).

If it is determined in step S40 that "the engine hood switch 15 is not closed, that is, the hood is open and the engine hood switch 15 is open", the process returns. On the other hand, if it is determined in step S40 that “the engine hood switch 15 is in the closed state”, an automatic stop condition establishment determination process is executed (step S43).
In this automatic stop condition establishment determination process, it is determined whether or not all the automatic stop conditions from step S1 to step S40 are in a state of being continuously established for a predetermined time. When it is determined that all of the automatic stop conditions are satisfied for a predetermined time, the automatic stop condition is satisfied and the idle stop condition is satisfied, and the ECU 1 controls the engine stop control including the fuel injection control means 23 with the engine stop control. A signal is output to stop the engine that is idling. It should be noted that the duration for which all of the automatic stop conditions are satisfied in the automatic stop condition and idle stop condition establishment determination processing is set to 10 seconds, for example.
For this reason, “the idle stop control main switch 20 is on”, “the engine is idling”, “the clutch pedal is in the released state”, “the transmission lever of the manual transmission is in the neutral position”, “the brake pedal is depressed” When the automatic stop condition including “vehicle stop state”, “driver's seat belt is attached”, and “engine hood switch 15 is closed” continues for 10 seconds, the engine automatically stops and enters an idle stop state.

Next, engine restart will be described.
This engine restart includes a normal auto start and a forced auto start.
In the normal auto start, the ECU 1 controls the starter motor 22 and the fuel injection control means 23 when the normal auto start condition is satisfied with respect to the engine that is stopped when the idle stop condition is satisfied, and automatically restarts the engine.
Further, in the forced auto start, the starter motor 22 and the fuel injection control means 23 are controlled by the forced auto start condition being satisfied for the engine that has been stopped when the idle stop condition is satisfied, and the engine is forcibly restarted.

FIG. 4 and FIG. 5 are flowcharts showing a normal auto start condition establishment determination process of the normal auto start means 4 in the engine restart control device of this embodiment.
FIG. 6 is a timing chart showing a process in which the engine stopped when the idle stop condition is satisfied is automatically restarted when the normal auto start condition is satisfied in the engine restart control device of this embodiment.
Hereinafter, the operation until the engine is normally auto-started will be described according to the flowcharts shown in FIGS. 4 and 5 and the timing chart shown in FIG.
First, the ECU 1 determines whether or not the idle stop control main switch 20 is set to ON (step S101), and returns when the idle stop control main switch 20 is not set to ON.
On the other hand, if the idle stop control main switch 20 is set to ON, it shifts to a standby state in which ISS can be executed.
After the transition to the standby state where ISS can be executed, it is subsequently determined whether or not the engine is in the idle stop state, which is the next normal auto-start condition (step S104).
Whether or not the engine is in the idle stop state is determined based on an idle stop signal transmitted as CAN communication information from the engine.

If it is determined in step S104 that the engine is not in the idle stop state, the process returns.
On the other hand, if it is determined in step S104 that the engine is in the “idle stop state”, then it is determined whether the next normal auto-start condition is “engine stop mode and engine stop mode continues for a predetermined time” (step S107). ).

If it is determined in step S107 that “the engine stop mode is not set or the engine stop mode is not continued for a predetermined time”, the process returns.
On the other hand, if it is determined in step S107 that “the engine stop mode and the engine stop mode have continued for a predetermined time”, then the next normal auto-start condition, “the state of the first clutch switch (front) 12 is the clutch pedal. It is determined whether or not the depression state is indicated, that is, whether or not the first clutch switch (front side) 12 is turned on (step S110).

If it is determined in step S110 that "the state of the clutch switch (front) does not indicate the depression of the clutch pedal, that is, the clutch switch (front) is not in the on state", the process returns.
On the other hand, if it is determined in step S110 that "the state of the clutch switch (front side) indicates that the clutch pedal is depressed", the condition is that the next normal auto-start condition is "not an auto-start prohibition idle stop state". A determination is made (step S125).
If it is determined in step S125 that “the engine is in an idle stop state where auto start is prohibited”, the process returns.
On the other hand, when it is determined in step S125 that “the engine is not in the idle stop prohibited auto start state”, the next normal auto start condition is “the position of the shift lever of the manual transmission is in the neutral position, that is, the manual transmission is switched to the neutral state. It is determined (step S113).
Whether or not the manual transmission is switched to the neutral state is determined based on the output of the neutral position sensor 16 that detects that the position of the manual transmission is in the neutral state.
If it is determined in step S113 that "the position of the transmission lever of the manual transmission is in the neutral position, that is, the manual transmission is switched to neutral", the routine proceeds to the normal auto start determination process in step S128, and the normal auto start condition is satisfied. And control processing of each part for starting normal auto start is executed.
On the other hand, if it is determined in step S113 that the position of the shift lever of the manual transmission is not in the neutral position, that is, the manual transmission is switched to a state other than neutral, then the next normal auto-start condition is “neutral position. It is determined whether the sensor is malfunctioning and whether the second clutch switch 13 detects the depression of the clutch pedal.
Therefore, it is first determined whether or not the neutral position sensor is faulty (step S116).
Since the neutral position sensor is included in the failure determination target of the idle stop control system, failure determination for the neutral position sensor is performed in the failure determination means 6 that performs an abnormality determination process on the devices constituting the idle stop control system. Based on the above, it is determined whether the neutral position sensor is faulty.

When it is determined in step S116 that “the neutral position sensor is not broken”, the next normal auto-start condition is “the engine stop mode and the engine stop mode are continued for a predetermined time after the idling stop state is continued”. It is determined whether or not the two-clutch switch 13 has detected the depression of the clutch pedal (step S122).
On the other hand, if it is determined in step S116 that "the neutral position sensor is out of order", then it is determined whether "the second clutch switch 13 detects the depression state of the clutch pedal" (step S119).

If it is determined in step S119 that "the second clutch switch 13 is off, that is, the state where the clutch pedal is fully depressed is not detected", the next normal auto-start condition, "idle stop state" is entered. It is determined whether or not the second clutch switch 13 has detected the depression state of the clutch pedal while the engine stop mode and the engine stop mode continue for a predetermined time (step S122).
On the other hand, if it is determined in step S119 that "the second clutch switch 13 is on, that is, the clutch pedal is fully depressed", in steps S116 and S119, "the neutral position sensor is faulty and the second clutch It is determined that the switch 13 is detecting the depression state of the clutch pedal. Subsequently, the process proceeds to the normal auto start determination process in step S128, and it is determined that the normal auto start condition is satisfied, and the normal auto start is performed. A process for controlling each unit for starting is executed.

If it is determined in step S122 that the condition that “the second clutch switch 13 detects the depression of the clutch pedal while the engine stop mode and the engine stop mode have continued for a predetermined time after the idling stop state is satisfied” is not satisfied, Since the normal auto start condition in step S113, the normal auto start condition in step S122, and both normal auto start conditions in steps S116 and S119 are simultaneously satisfied, the routine returns.
On the other hand, when it is determined in step S122 that the condition that the second clutch switch 13 detects the depression of the clutch pedal while the engine stop mode and the engine stop mode continue for a predetermined time after entering the idle stop state is satisfied. Then, the process proceeds to the normal auto start determination process in step S128, and it is determined that the normal auto start condition is satisfied, and the process for controlling each part for starting the normal auto start is executed.

  In the normal auto-start determination process in step S128, both the normal auto-start condition in step S116 and the normal auto-start condition in step S119 are satisfied. “The neutral position sensor for detecting the neutral position of the manual transmission shift lever has failed. The second clutch switch 13 shows the state where the clutch pedal is fully depressed ", or the normal auto start condition of" the manual transmission shift lever is in the neutral state "in step S113. If the engine is stopped after being in the idling stop state and the engine has been kept in this state for a predetermined time, the clutch pedal is fully depressed. The second clutch switch 13 has detected a rare state "normal auto start condition of any of the normal auto start conditions," idle stop control main switch 20 is on "normal auto start condition of step S101, step The normal auto start condition of “Idle stop state” in S104, the normal auto start condition of “Engine stop mode continued for a predetermined time” in Step S107, the first clutch switch in Step S110 is on and the clutch pedal is depressed. "Normal auto start condition", "Auto start prohibited idle stop state" in step S125, and normal auto start conditions from step S101 to step S125 are all satisfied. Judges Rukoto to the conditions and the normal auto-start conditions are satisfied.

Next, forced auto start will be described.
FIGS. 7 and 8 are flowcharts showing a forced autostart condition establishment determination process of the forced autostart means 5 in the engine restart control device of this embodiment.
Hereinafter, the operation until the engine is forcibly auto-started will be described with reference to the flowcharts shown in FIGS.
First, the ECU 1 determines whether or not the idle stop control main switch 20 is set to ON (step S201), and returns when the idle stop control main switch 20 is not set to ON.
On the other hand, if the idle stop control main switch 20 is set to ON, it shifts to a standby state in which ISS can be executed.
After the transition to the standby state where ISS can be executed, it is subsequently determined whether or not the engine is in the idle stop state, which is the next forced auto-start condition (step S204).
This “idle stop state” is determined based on an idle stop signal transmitted as CAN communication information from the engine.
If it is determined in step S204 that the state is not “idle stop state”, the process returns.
On the other hand, if it is determined in step S204 that the engine is in the “idle stop state”, then it is determined whether the next forced autostart condition is “engine stop mode and engine stop mode continues for a predetermined time” (step S207). ).

If it is determined in step S207 that the engine stop mode is not set or the engine stop mode has not continued for a predetermined time, the process returns.
On the other hand, if it is determined in step S207 that “the engine stop mode and the engine stop mode have continued for a predetermined time”, it is subsequently determined whether or not the next forced autostart condition is “not in an autostart prohibited idle stop state” ( Step S210).

If it is determined in step S210 that "the auto start prohibition idle stop state is present", the process returns.
On the other hand, if it is determined in step S210 that “the vehicle is not in an idle start prohibiting idle stop state”, it is determined whether the next forced autostart condition is “the vehicle speed is equal to or higher than a predetermined value or the vehicle speed sensor is abnormal” (step S213). ).

If it is determined in step S213 that “the vehicle speed is not equal to or higher than the predetermined value and the vehicle speed sensor is not abnormal”, the next forced auto-start condition is “whether the engine water temperature is lower than the predetermined value and a predetermined time has elapsed after the idle stop”. Is determined (step S216).
On the other hand, if it is determined in step S213 that “the vehicle speed is equal to or higher than the predetermined value or the vehicle speed sensor is abnormal”, the process proceeds to a forced auto-start determination process in step S228.

If it is determined in step S216 that “the engine water temperature is higher than the predetermined value or the predetermined time has not elapsed after the idling stop”, the next forced auto-start condition is “the brake negative pressure is greater than the predetermined value or the brake negative pressure sensor is Whether or not a temporary failure code is stored is determined (step S219).
If it is determined in step S216 that "the engine water temperature is lower than the predetermined value and a predetermined time has elapsed after the idling stop", the process proceeds to a forced auto-start determination process in step S228.

If it is determined in step S219 that “the brake negative pressure is equal to or smaller than the predetermined value or the brake negative pressure sensor does not store the temporary failure code”, the next forced auto-start condition “A / C idle stop permission determination is prohibited” In addition, it is determined whether a predetermined time has elapsed after the idle stop (step S222).
On the other hand, if it is determined in step S219 that "the brake negative pressure is equal to or greater than the predetermined value or the brake negative pressure sensor stores the temporary failure code", the process proceeds to the forced auto-start determination process in step S228.

If it is determined in step S222 that “A / C idle stop permission determination is not prohibited or a predetermined time has not elapsed after the idle stop”, the next forced auto-start condition “when the idle stop prohibited electrical load condition is satisfied is satisfied. It is determined whether or not a predetermined time has elapsed after the idle stop (step S225).
On the other hand, if it is determined in step S222 that “the A / C idle stop permission determination is prohibited and a predetermined time has elapsed after the idle stop”, the process proceeds to a forced auto start determination process in step S228.

If it is determined in step S225 that “the idle load prohibition electric load condition is not satisfied or a predetermined time has not elapsed after the idle stop”, the process returns.
On the other hand, if it is determined in step S225 that “the electric load condition for the idle stop prohibition is satisfied and a predetermined time has elapsed after the idle stop”, the process proceeds to a forced autostart determination process in step S228.

In the forced auto-start determination process of step S228, all the forced auto-start conditions of step S201, step S204, step S207, and step S210 are satisfied at the same time, and among step S213, step S216, step S219, step S222, and step S225, It is determined that the forced auto start condition is satisfied on the condition that any one of the forced auto start conditions is satisfied.
As a result, the starter motor 22 and the fuel injection control means 23 are controlled, and the engine is forcibly restarted.

As described above, according to this embodiment, when the state in which the clutch pedal is depressed is detected by the first clutch switch 12, the state in which the clutch pedal is depressed until the clutch is disengaged. When a failure of the neutral position sensor 16 is detected, which is detected by the second clutch switch 13 and detects a state in which the transmission gear is switched to neutral, an engine restart condition is established, and the engine Configured to restart.
Therefore, even if the neutral position sensor that detects the state where the speed change lever is in the neutral position fails, the engine in the idle stop state can be operated by the first clutch switch 12 and the second clutch switch 13 that detect the depression state of the clutch pedal. It can be restarted according to the operation state.
For this reason, it is possible to avoid the situation where the engine cannot be restarted when the neutral position sensor fails and the shift lever cannot be detected in the neutral position as in the conventional case, and it is easy to use for troubles that may occur in the neutral position sensor. There is an effect that can be improved.

It is a block diagram which shows the structure of the restart control apparatus of the engine which is embodiment of this invention. It is a flowchart which shows the establishment determination process of the automatic stop (idle stop) conditions of the engine automatic stop means in the engine restart control apparatus which is embodiment of this invention. It is a flowchart which shows the establishment determination process of the automatic stop (idle stop) conditions of the engine automatic stop means in the engine restart control apparatus which is embodiment of this invention. It is a flowchart which shows the normal autostart condition establishment determination process of the normal autostart means in the engine restart control apparatus which is the embodiment of the present invention. It is a flowchart which shows the normal autostart condition establishment determination process of the normal autostart means in the engine restart control apparatus which is the embodiment of the present invention. 4 is a timing chart illustrating a process in which an engine stopped when an idle stop condition is satisfied is automatically restarted when a normal auto start condition is satisfied in the engine restart control device according to the embodiment of the present invention. It is a flowchart which shows the forced autostart condition establishment determination process of the forced autostart means in the restart control apparatus of the engine of embodiment of this invention. It is a flowchart which shows the forced autostart condition establishment determination process of the forced autostart means in the restart control apparatus of the engine of embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... ECU, 2 ... Engine automatic stop means, 3 ... Engine restart means, 4 ... Normal auto start means, 6 ... Failure determination means, 7 ... Engine stop mode continuation determination means, 12 ... 1st 1 clutch switch (first clutch pedal position detecting means), 13 ... second clutch switch (second clutch pedal position detecting means), 16 ... neutral position sensor (neutral position detecting means), 22 ... starter motor, 23 ... Fuel injection control means.

Claims (3)

An engine restart control device for an idle stop start vehicle that automatically stops the engine when an automatic stop condition is satisfied during operation of the engine and restarts the engine when the restart condition is satisfied while the engine is automatically stopped. There,
First clutch pedal position detecting means for detecting a first state in which the clutch pedal is depressed;
Second clutch pedal position detecting means for detecting a second state in which the clutch pedal is depressed until the clutch is disengaged;
Neutral position detecting means for detecting a state where the transmission gear position is neutral;
A failure determination means for detecting a failure of the neutral position detection means;
Engine restart means for restarting the engine when the restart condition is satisfied , and
The engine restarting means is configured to detect when the transmission gear position is neutral by the neutral position detecting means when the first state is detected by the first clutch pedal position detecting means. The engine is restarted, and the engine is restarted when the second state is detected by the second clutch pedal position detecting means when the failure determining means detects a failure of the neutral position detecting means. An engine restart control device characterized by starting . Engine stop mode continuation determining means for determining whether or not the automatic stop state continues for a predetermined time,
2. The engine restart control device according to claim 1, wherein the engine restart unit includes a determination result by the engine stop mode continuation determination unit that the automatic stop state has continued for a predetermined time in establishment of the restart condition. The engine restarting means restarts the engine when the second state is detected by the second clutch pedal position detecting means after the automatic stop state continues for the predetermined time, and the automatic stop 3. The engine restart control device according to claim 2 , wherein when the second state is detected before the state continues for the predetermined time, the engine is restarted after the predetermined time has elapsed .

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