JP2003175747A - Automatic stopping/restarting device for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic stopping/restarting device for an engine preventing the danger of rapid start due to accelerator operation upon restarting the engine. <P>SOLUTION: An idle stop ECU 6 detects that a predetermined restarting condition is established due to the accelerator operation S2, S4, S5, restricts and controls rapid acceleration S6 of a vehicle including restricting and controlling a torque of the engine S61 and increasing and controlling a brake pressure S62 and controls restarting of the engine S7 with restricting and controlling rapid acceleration. Thereby, the danger of rapid start of the vehicle due to the accelerator operation upon restarting of the engine can be securely prevented. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine automatic stop / restart system capable of executing an idle stop mode.

[0002]

2. Description of the Related Art Conventionally, an idle engine that automatically stops an engine when a predetermined stop condition is satisfied while the vehicle is traveling and restarts the engine when a predetermined restart condition is satisfied while the engine is automatically stopped. An engine automatic stop / restart device capable of executing a stop mode has been developed, and a vehicle equipped with such a device has been put to practical use.

In this kind of engine automatic stop / restart system, in order to restart the engine while the engine is automatically stopped, it is set as a restart condition that the brake pedal is released or the accelerator pedal is depressed. There is something.

[0004]

However, when the engine is restarted due to the depression of the accelerator pedal, the engine rotation speed increases rapidly with the start of the engine, so that the vehicle suddenly starts and is dangerous. May occur. In particular, there is a problem that a driver who normally depresses the accelerator pedal and the foot brake at the same time, which is a so-called double depression, is likely to suddenly start.

It is an object of the present invention to provide an engine automatic stop / restart system which prevents the risk of sudden start at engine restart due to accelerator depression.

[0006]

In order to achieve this object, an engine automatic stop / restart system according to claim 1 is provided with:
It is possible to execute an idle stop mode that automatically stops the engine when a predetermined stop condition is satisfied and restarts the engine when a predetermined restart condition including depression of the accelerator pedal is satisfied while the engine is automatically stopped. In an automatic engine stop / restart system, a detection unit that detects that the predetermined restart condition is established due to the depression of the accelerator pedal while the engine is automatically stopped, and the restart condition is established by the detection unit. Is detected, a sudden acceleration suppression control unit that executes a sudden acceleration suppression control of the vehicle, and an engine restart control is executed in a state where the sudden acceleration suppression control is executed by the sudden acceleration suppression control unit. And a restart control means.

Therefore, the detection means detects that the predetermined restart condition is satisfied due to the depression of the accelerator pedal during the automatic stop of the engine, and the rapid acceleration suppression control means uses the detection means. When the satisfaction of the restart condition is detected, the vehicle sudden acceleration suppression control is executed, and the restart control means re-executes the engine re-execution while the sudden acceleration suppression control is being executed by the sudden acceleration suppression control means. Executes start control.

Therefore, when the engine is restarted due to the depression of the accelerator pedal, the engine is started in the state where the rapid acceleration suppression control is performed, so that it is possible to prevent the risk of the vehicle suddenly starting. it can.

According to a second aspect of the present invention, there is provided the engine automatic stop / restart system, wherein the sudden acceleration restraint control means, when the depression release of the accelerator pedal is detected during execution of the sudden acceleration restraint control, the sudden acceleration restraint control means. It is characterized in that the acceleration suppression control is released.

Therefore, the restart control means executes the restart control of the engine in the state where the sudden acceleration suppression control is being executed, and the sudden acceleration suppression control means is provided while the sudden acceleration suppressing control is being executed. When the depression release of the accelerator pedal is detected, the sudden acceleration suppression control is released.

Therefore, when the accelerator pedal is released and the risk of sudden start is eliminated, the rapid acceleration suppression control is immediately released, so that the driver can smoothly start the vehicle.

Further, in the engine automatic stop / restart system according to a third aspect of the present invention, the sudden acceleration restraint control means cancels the sudden acceleration restraint control when the predetermined acceleration time is detected after the engine is restarted. It is characterized in that it is configured to.

Therefore, the restart control means executes the engine restart control in the state where the sudden acceleration suppression control is being executed, and the sudden acceleration suppression control means carries out a predetermined time period after the engine is restarted. Is detected, the rapid acceleration suppression control is released.

Therefore, when the driver requests a sudden acceleration after a predetermined time has elapsed after the engine is restarted, the abrupt acceleration suppression control is immediately released, so that the vehicle can be prevented from suddenly starting and have sufficient acceleration. You can

Further, the automatic engine stop / restart system according to a fourth aspect of the present invention is characterized in that the sudden acceleration suppression control means includes a torque suppression control means for performing engine torque suppression control.

Therefore, the restart control means executes the engine restart control while the engine torque suppression control is being executed. As a method for controlling the torque of the engine, known methods such as air amount control, fuel injection amount control, ignition timing control and the like can be used.

Therefore, by restarting the engine while suppressing the torque of the engine, it is possible to reliably prevent the sudden start of the vehicle due to the depression of the accelerator pedal.

Further, in the engine automatic stop / restart system according to the present invention, the torque suppression control means controls the torque suppression control of the engine so as to gradually decrease with the passage of time. And

Therefore, the restart control means executes the engine restart control while the torque suppression control is being executed, and the torque suppression control means gradually lowers the torque suppression control with the lapse of time. .

Therefore, although the engine speed increases with the lapse of time after the restart, the torque suppression control of the engine gradually decreases accordingly, so that a sudden start of the vehicle is prevented and the vehicle is smoothly operated. Can be started.

Further, in the engine automatic stop / restart system according to a sixth aspect of the present invention, the sudden acceleration suppression control means includes a brake pressure increase control means for increasing the brake pressure according to the accelerator opening. It is characterized by

Therefore, the restart control means executes the engine restart control while the brake pressure increase control is being executed.

Therefore, by restarting the engine in a state where the brake pressure is increased according to the accelerator opening, it is possible to reliably prevent the sudden start of the vehicle due to the depression of the accelerator pedal.

Further, in the engine automatic stop / restart system according to a seventh aspect of the present invention, the brake pressure increase control means controls the brake pressure so as to gradually decrease the brake pressure over time. To do.

Therefore, the restart control means executes the restart control of the engine in the state where the brake pressure increase control is being executed, and the brake pressure increase control means changes the pressure-controlled brake pressure in time. Gradually decrease over time.

Therefore, the engine speed increases with the lapse of time after the restart, but the brake pressure gradually decreases accordingly, so that the vehicle can be started smoothly while preventing sudden start of the vehicle. be able to.

Further, in the engine automatic stop / restart system according to the present invention, the detecting means is configured not to detect the establishment of the restart condition when the accelerator pedal is depressed by a predetermined amount or more. It is characterized by that.

Therefore, when the accelerator pedal is depressed by a predetermined amount or more, it is not detected that the restart condition is satisfied, and the engine is not restarted by the restart means.

Therefore, when the accelerator pedal is depressed extremely deeply and the sudden start of the vehicle cannot be suppressed by suppressing the torque of the engine or increasing the brake pressure, the engine is controlled not to be restarted. It is possible to prevent a sudden start of the vehicle.

Further, the engine automatic stop / restart system according to claim 9 automatically stops the engine when a predetermined stop condition is satisfied, and a predetermined restart including depression of an accelerator pedal during the automatic stop of the engine. In the engine automatic stop restart device that can execute the idle stop mode that restarts the engine when the starting condition is satisfied,
A detection unit that detects that the restart condition is satisfied due to the depression of the accelerator pedal during the automatic stop of the engine, and an engine restart when the detection unit detects that the restart condition is satisfied. Restarting means for executing the starting control, wherein the detecting means is configured not to detect the establishment of the restarting condition due to the depression of the accelerator pedal when an abnormality occurs in the vehicle system. Is characterized by.

Therefore, the detecting means does not detect the establishment of the restart condition due to the depression of the accelerator pedal when an abnormality occurs in the vehicle system during the automatic stop of the engine, and in other cases, the accelerator. The restart control means detects that the restart condition is satisfied due to the depression of the pedal, and the restart control means executes the restart control of the engine when the detection means detects that the restart condition is satisfied. .

Therefore, when an abnormality occurs in the vehicle system, the engine is not restarted by depressing the accelerator pedal, so that sudden start of the vehicle can be prevented.

The automatic engine stop / restart system according to a tenth aspect of the invention automatically stops the engine when a predetermined stop condition is satisfied, and a predetermined restart including depressing an accelerator pedal during the automatic stop of the engine. In the engine automatic stop and restart device capable of executing the idle stop mode for restarting the engine when the starting condition is satisfied, when the depression of the accelerator pedal and the depression of the brake are simultaneously detected during the operation of the engine, It is characterized by further comprising mode releasing means for releasing the idle stop mode.

Therefore, the mode canceling means cancels the idle stop mode when the depression of the accelerator pedal and the depression of the brake are simultaneously detected while the engine is operating.

Therefore, for a driver who has a habit of so-called double-stepping, in which the accelerator pedal and the brake are both depressed at the same time, the idle stop mode is automatically canceled to allow the vehicle to restart when the engine is restarted. It is possible to prevent a sudden start.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an engine automatic stop / restart system embodying the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the entire drive system 1 for a vehicle in this embodiment. The drive system 1 automatically stops the engine when a predetermined stop condition is satisfied, and restarts the engine when a predetermined restart condition including depression of the accelerator pedal is satisfied while the engine is automatically stopped. It is a drive system capable of executing a mode and constitutes the engine automatic stop / restart system of the present invention.

As shown in FIG. 1, the drive system 1 includes an engine 2, an automatic transmission 3, a brake mechanism 4, and an engine electronic control unit (hereinafter referred to as engine ECU) 5
And an idle stop electronic control unit (hereinafter referred to as an idle stop ECU) 6 and a brake electronic control unit (hereinafter referred to as a brake ECU) 7.

The engine 2 is provided with a normal starter 8, a restart starter 9, and an alternator 10. Here, the normal starter 8 is a motor that normally starts the engine by the ignition key. On the other hand, the restart starter 9 is a motor for restarting the engine 2 during automatic stop in the idle stop mode, and, like the alternator 10, is connected to the shaft of the engine 2 via the belt 11.

The automatic transmission 3 is provided with an electric AT pump 3a. The electric AT pump 3a is an electric oil pump for an automatic transmission. The electric AT pump 3a is
Since it is driven even when the engine is automatically stopped, the forward clutch can always be kept in the engaged state. Therefore, the present drive system 1 does not have the drawback of the prior art that the starting performance is impaired by engaging the forward clutch after the engine is restarted.

The engine ECU 5 has a CPU and a ROM.
And a RAM, and is a device that performs processing such as calculation based on various input signals and outputs various commands for controlling the engine 2 and the automatic transmission 3.

More specifically, the engine ECU 5
Signals relating to vehicle speed, battery voltage, engine speed, accelerator opening, AT shift position, engine water temperature, road surface inclination amount, brake negative pressure, etc. output from various sensors provided in the drive system 1 are input to the. At the same time, the fuel injection amount signal, the intake amount signal, and the ignition control signal output from the idle stop ECU 6 are input. Further, various commands such as injection / ignition / intake control signals are output from the engine ECU 5 to the engine 2 and the automatic transmission 3, and the drive system 1 such as the engine 2 and the automatic transmission 3 is output.
The status signal showing the status of each part is the idle stop E
Output to CU6.

The idle stop ECU 6 controls the engine E
Like the CU 5, it is configured to include a CPU, a ROM, and a RAM, and outputs various commands for performing automatic stop and restart in the idle stop mode based on a status signal indicating the state of each part of the drive system 1. . The idle stop ECU 6 is electrically connected to a main switch 6a of an idle stop system provided inside the vehicle.

More specifically, the idle stop ECU 6 receives the status signal output from the engine ECU 5 and the brake stroke signal output from the brake stroke sensor 4a. Further, the fuel injection amount signal, the intake amount signal, and the ignition control signal are sent from the idle stop ECU 6 to the engine ECU.
5, the normal starter control signal is output to the normal starter 8, the restart starter control signal is output to the restart starter 9, the electric AT pump control signal is output to the electric AT pump 3a, and the brake control signal is output to the brake ECU 7.

Further, an ON signal or an OFF signal for the idle stop mode is input to the idle stop ECU 6 from the main switch 6a. The driver presses the main switch 6a provided in the vehicle cabin to activate (ON) or deactivate (OF) the idle stop mode.
F) can be switched.

Like the engine ECU 5, the brake ECU 7 includes a CPU, a ROM, and a RAM. The brake control signal output from the idle stop ECU 6 and the master cylinder pressure signal from the brake mechanism 4 are input to the brake ECU 7. A brake control signal for controlling the brake mechanism 4 is output to the brake mechanism 4 based on these input signals.

Next, in the drive system 1 having the above-described structure, a process for automatically stopping the engine when a predetermined automatic stop condition is satisfied will be described.

The automatic stop conditions are, for example, (a) the idle stop mode is ON, (b) the vehicle speed is zero, and (c) the shift position of the automatic transmission 3 is a drive position (hereinafter abbreviated as D position). (D) It is set as if the foot brake 4b is stepped on, and automatic stop is performed when all conditions are satisfied.

Whether or not these automatic stop conditions are satisfied is determined by the CPU included in the idle stop ECU 6.
By executing the program stored in the ROM. The details of the determination process for each condition will be described below.

Regarding the condition (a), the main switch 6
When the ON signal from a is input to the idle stop ECU 6, it is determined that the condition is satisfied.

Regarding the condition (b), a vehicle speed signal detected and output by a vehicle speed sensor (not shown) provided in the drive system 1 is input to the engine ECU 5, and is output from the engine ECU 5 based on the vehicle speed signal and idle stop is performed. The status signal input to the ECU 6 is
When the vehicle speed is zero, it is determined that the condition is satisfied.

Regarding the condition (c), the AT shift position signal output from the automatic transmission 3 is the engine ECU.
5 is input, the status signal output from the engine ECU 5 based on the AT shift position signal and input to the idle stop ECU 6 indicates that the AT shift position is the D position. It is judged that they are doing.

Regarding the condition (d), the brake stroke sensor 4a outputs the idle stop EC.
When the brake stroke signal input to U6 indicates that the brake stroke is 20% or more, it is determined that the condition is satisfied. The brake stroke is defined as 0% when the foot brake 4b is not depressed at all and 100% when the foot brake 4b is fully depressed. Refers to the indicated numerical value.

When the idle stop ECU 6 determines that all the above conditions (a) to (d) are satisfied, the idle stop ECU 6 determines the fuel injection amount for cutting off the fuel supply to the engine. Signal the engine E
Output to CU5. As a result, the fuel supply to the engine 2 is cut and the engine 2 is automatically stopped.

Next, a process for restarting the engine 2 when a predetermined restart condition is satisfied while the engine 2 is automatically stopped will be described with reference to FIG. 2 is a flowchart of the main routine during automatic stop,
The content of a series of processes performed by the idle stop ECU 6 from automatic stop to restart is shown. Also,
The processing program of the main routine is stored in the ROM incorporated in the idle stop ECU 6 and executed by the CPU.

When the main routine shown in FIG. 2 is entered, it is first determined whether or not automatic stop is in progress (step 1).
(Hereinafter, step 1 is abbreviated as S1. The same applies to other steps.) When the automatic stop is not being performed (S1: N
o), the processing of this routine ends.

When the automatic stop is being performed (S1: Yes), it is determined whether or not the brake stroke is less than 20% (S2). When the brake stroke is less than 20% (S2: Yes), engine restart control is performed (S3). In addition, when the brake stroke is less than 20%, it means that the depression of the foot brake 4b has been sufficiently relaxed, and it can be considered that the driver's intention of traveling has been indicated. The restart control will be performed.

In the engine restart control (S3), the idle stop ECU 6 outputs a restart starter control signal to the restart starter 9, whereby the restart starter 9 is driven and the engine 2 is restarted. When the engine restart control (S3) ends, the processing of this routine ends.

The restart in S3 is carried out when the engine 2 is restarted due to the release of the foot brake 4b, and the risk of sudden start is small. Sudden acceleration suppression control is not performed.

When the brake stroke is 20% or more in S2 (S2: No), it is determined whether or not there is an abnormality in the drive system 1 of the vehicle (S4). Drive system 1
If there is an abnormality (S4: No), the process returns to S2. Therefore, when the drive system 1 has an abnormality, the restart is performed only by loosening the depression of the foot brake 4b, and the restart is not caused by the depression of the accelerator pedal. The risk of sudden start can be prevented.

When there is no abnormality in the drive system 1 in S3 (S4: Yes), the accelerator opening exceeds 0% and is 90%.
It is determined whether it is less than% (S5). When the accelerator opening is 0% or 90% or more (S5:
No), the process returns to S2.

Here, when the accelerator opening is 0%, it means that the foot brake 4b is depressed and the accelerator pedal is not depressed at all, and the driver's intention to start traveling is made. There is no state. Further, when the accelerator opening is 90% or more, it is a case where the operator is trying to make an extremely sudden start by depressing the accelerator pedal at the same time while stepping on the foot brake 4b. The automatic stop is continued without executing the restart control.

At S5, the accelerator opening exceeds 0% and is 90
When it is less than% (S5: Yes), the rapid acceleration suppression control is executed (S6).

Here, the details of the sudden acceleration suppression control (S6) will be described with reference to the flowchart of FIG.

When the rapid acceleration suppression control routine is entered, first, the brake pressure increase control is executed (S61). In the brake pressure increase control (S61), a sudden start of the vehicle is prevented by increasing the brake pressure according to the accelerator opening. More specifically, when the idle stop ECU 6 detects the accelerator opening based on the status signal output from the engine ECU 5, a brake control signal is output to the brake ECU 7 according to the accelerator opening. Here, the control method of the brake pressure increase may be a control method of increasing the brake pressure to a predetermined value when the accelerator opening is equal to or larger than a predetermined value, or may increase the brake pressure according to the accelerator opening. Any control method (for example, control for increasing the brake pressure in proportion to the accelerator opening) may be used.

Subsequently, torque suppression control is executed (S
62). In the torque suppression control (S62), a known method for suppressing the engine torque can be used,
For example, there are air amount control, fuel injection amount control, ignition timing control and the like. More specifically, the air amount control suppresses the torque by outputting the intake air amount signal from the idle stop ECU 6 to the engine ECU 5 to make the throttle opening smaller than usual. The fuel injection amount control outputs a fuel injection amount signal from the idle stop ECU 6 to the engine ECU 5 to reduce the fuel supply amount to a value smaller than usual, thereby suppressing torque. In the ignition timing control, the ignition stop angle control is performed by outputting an ignition control signal from the idle stop ECU 6 to the engine ECU 5, and the torque is suppressed by shifting the ignition timing from the optimum value. By suppressing the torque in this way, it is possible to suppress a sudden increase in rotation when the engine is restarted and to reliably suppress sudden acceleration of the vehicle.

When the processing of the sudden acceleration suppression control routine is completed, the process returns to the main routine of FIG. 2 and the engine restart control is executed (S7). Engine restart control (S7)
Then, from the idle stop ECU 6 to the restart starter 9
A restart starter control signal is output to the restart starter 9 to drive the restart starter 9 to restart the engine.

Subsequently, it is determined whether the accelerator opening is larger than 0% (S8). When the accelerator opening becomes 0% (S8: No), the sudden acceleration suppression control is canceled (S10).

On the other hand, when the accelerator opening is larger than 0% (S8: Yes), it is determined whether a predetermined time has elapsed from the start of engine restart (S9). Here, the predetermined time is a time after starting the engine restart control, and is set to, for example, 1 to 3 seconds. When the predetermined time has not elapsed (S9: No), the process returns to S8, and the processes of S8 to S9 are repeated until the process of S8 or S9 becomes Yes and the process of S10 is performed. When the predetermined time has elapsed after the engine restart is started (S9: Yes), the sudden acceleration suppression control is canceled (S10).

Here, the processing for canceling the sudden acceleration suppression control (S1
Details of 0) will be described with reference to the flowchart of FIG.

In the sudden acceleration suppression control cancellation processing routine, torque suppression control cancellation (S101) and brake pressure increase control cancellation (S102) are performed. Torque suppression control release (S1
01), from the idle stop ECU 6 to the engine E
By outputting various signals such as the intake air amount signal to the CU 5, a process of returning the engine torque suppressed in the torque suppression control (S62) to the normal state is performed.

In the brake pressure increase control release (S102), the brake control signal is output from the idle stop ECU 6 to the brake ECU 7 so that the brake pressure which was increased in the execution of the brake pressure increase control (S61) is controlled. Processing for returning to the normal state is performed.

When the processing of the sudden acceleration suppression control cancellation routine is completed, the process returns to the main routine and all the processing is completed.

In the first embodiment described above, S
The steps S2, S4 and S5 are the detection means of the present invention.
The steps S6, S8 to S10 serve as the sudden acceleration suppression control means, and the step S7 serves as the restart control means.
The step of S62 functions as a brake pressure increase control means, and the step of S62 functions as a torque suppression control means.

Next, a second embodiment of the present invention will be described with reference to the drawings.

In the second embodiment, the main switch 6a of the idle stop system is automatically turned off when the accelerator pedal is depressed and the foot brake is depressed at the same time while the engine is operating. Is configured to. Whether the foot brake is depressed is detected by turning on the brake switch (with depression) / OFF (without depression), and detecting whether the accelerator pedal is depressed by turning on the idle switch (without depression) / OFF (with depression). Is configured. Note that the overall configuration of the vehicle drive system 1 is the same as that of the above-described first embodiment, so description thereof will be omitted.

The process when the accelerator pedal and the foot brake are depressed at the same time while the engine is running will be described with reference to the flowchart of FIG.

In the flowchart of FIG. 5, first, it is determined whether the engine is operating (S21). If the engine is not in operation (S21: No), the process of this routine ends.

When the engine is running (S21: Y
es), it is determined whether the brake switch is ON or OFF (S22). Brake switch is off
If (i.e., the foot brake 4b is not depressed at all) (S22: OFF), the process of this routine ends.

When the brake switch is ON (that is, when the brake is depressed a little) (S22: ON), whether the idle switch is ON or O
It is determined whether it is FF (S23). When the idle switch is ON (that is, when the accelerator is not depressed at all) (S23: ON), the process of this routine is finished. When the idle switch is OFF (that is, when the accelerator is depressed a little) (S23: OFF), the idle stop mode is canceled (OFF) (S24).

As described above, according to the second embodiment, when the accelerator pedal and the foot brake 4b are both depressed while the engine is operating, the main switch of the idle stop system is automatically turned off and the idle stop is stopped. The mode is canceled. Therefore, thereafter, unless the driver presses the main switch 6a of the idle stop system again to turn it on, the engine 2 will not be automatically stopped and will not be restarted. It is possible to reliably prevent a sudden start when the engine is restarted, which is easily caused by a driver who has a habit of stepping on both sides.

In the second embodiment described above, S
The steps 21 to S24 function as the mode releasing means of the present invention.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, in the first embodiment, from when the brake pressure is increased in the brake pressure increase control execution (S61) until it is returned to the normal brake pressure by the brake pressure increase control release (S102). Although the control is such that the constant brake pressure that is pressure-controlled is maintained, as shown in FIG. 6, the brake pressure that is pressure-controlled may be controlled to be gradually decreased with the passage of time. . In this case,
The brake pressure does not suddenly decrease, and the brake pressure that has been pressure-increased is returned to the normal state more smoothly. Therefore, it is possible to prevent the vehicle from suddenly starting and accelerate very naturally. .

Similarly, in the first embodiment, a constant suppression control is performed from the time when the engine torque is suppressed in the torque suppression control execution (S62) until the normal torque is restored by the torque suppression control cancellation (S101). However, the suppression control may be controlled so as to gradually decrease with the passage of time. In this case, the torque suppression control does not suddenly decrease, and the torque under the suppression control returns to the normal state more smoothly, so that the vehicle can be accelerated very naturally while preventing sudden start. Has the effect.

Further, in the first embodiment, the brake pressure increasing control (S61) and the torque suppressing control (S62) are executed as the sudden acceleration suppressing control, but either one of the controls is executed. Good.

[0087]

As described above, according to the engine automatic stop / restart system according to the first aspect of the present invention, when the engine is restarted due to the depression of the accelerator pedal, the rapid acceleration suppression control is performed. Since the engine is started in the state where the operation is performed, it is possible to prevent the danger that the vehicle suddenly starts.

Further, according to the engine automatic stop / restart system of the second aspect, the sudden acceleration suppression control is immediately released when the accelerator pedal is released and the danger of sudden start is eliminated. Has the effect of smoothly starting the vehicle.

Further, according to the automatic engine stop / restart system of the third aspect, the sudden acceleration suppression control is immediately released when the driver requests a sudden acceleration after a predetermined time has passed after the engine is restarted. It is possible to achieve both prevention of sudden start of the vehicle and sufficient acceleration.

According to the automatic engine stop / restart system of the fourth aspect of the present invention, the engine is restarted while the torque is suppressed, so that the sudden start of the vehicle due to the depression of the accelerator pedal can be reliably prevented. There is an effect that can be.

Further, according to the automatic engine stop / restart system of the fifth aspect, the engine speed increases as time elapses after the restart, but the torque suppression control of the engine gradually decreases accordingly. Therefore, it is possible to smoothly start the vehicle while preventing the vehicle from suddenly starting.

Further, according to the automatic engine stop / restart system of the sixth aspect, the engine is restarted in a state where the brake pressure is increased according to the accelerator opening, so that the vehicle can be operated by depressing the accelerator pedal. This has an effect that it is possible to reliably prevent sudden start.

According to the engine automatic stop / restart system of the seventh aspect, the engine speed increases with the lapse of time after the restart, but the brake pressure gradually decreases accordingly. It is possible to prevent the sudden start of the vehicle and smoothly start the vehicle.

Further, according to the automatic engine stop / restart system of the eighth aspect, when the accelerator pedal is depressed extremely deeply and the sudden start of the vehicle cannot be suppressed by suppressing the torque of the engine or increasing the brake pressure. In addition, by controlling so that the engine is not restarted, it is possible to prevent the sudden start of the vehicle.

Further, according to the engine automatic stop / restart system of the ninth aspect, when an abnormality occurs in the vehicle system, the engine is not restarted by depressing the accelerator pedal, so that the sudden start of the vehicle is prevented. There is an effect that can be done.

According to the automatic engine stop / restart system of the tenth aspect, the idle stop mode is provided for the driver who has a habit of so-called double-stepping, in which the accelerator pedal and the brake are simultaneously depressed. There is an effect that it is possible to prevent the vehicle from suddenly starting when the engine is restarted.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of a vehicle drive system that is a first embodiment of the present invention.

FIG. 2 is a flowchart of a main routine during automatic stop according to the first embodiment.

FIG. 3 is a flowchart of a sudden acceleration suppression control start process according to the first embodiment.

FIG. 4 is a flowchart of a sudden acceleration suppression control cancellation process according to the first embodiment.

FIG. 5 is a flowchart of idle stop mode cancellation processing according to the second embodiment.

FIG. 6 is a diagram showing a relationship between an engine speed and a brake pressure in a modified example of the first embodiment, (a) shows an engine speed after restart control is started, and (b) shows a brake pressure decrease. Each characteristic is shown.

[Explanation of symbols]

1 ... Drive system (engine automatic stop / restart device) 2 ... engine 4b: Foot brake (brake) S2, S4, S5 ... (Detection means) S6, S8 to S10 ... (Rapid acceleration suppression control means) S7 ... (Restart control means) S61 ... (Brake pressure increase control means) S62 (torque suppression control means) S21 to S24 ... (Mode releasing means)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02D 29/02 321 F02D 29/02 321A 3G301 321B 341 341 41/10 310 41/10 310 310 330 330A 45/00 312 45/00 312E 312M 314 314E 314G (72) Inventor Kazuo Masaki 1-1, Showa-cho, Kariya-shi, Aichi Stock Company Denso (72) Inventor Tetsuya Abe 1-1-chome, Showa-cho, Kariya-shi, Aichi Stock Association Company's DENSO F-term (reference) 3D041 AA72 AB01 AC01 AC26 AC30 AD02 AD10 AD14 AD31 AD41 AD47 AD51 AE03 AE41 3D046 BB02 GG02 GG06 HH02 HH05 HH07 HH16 HH17 HH22 JJ01 JJ13 JJ16 3G084 BA02 BA01 FA16 BA16 BA10 BA01 BA16 BA13 BA16 BA13 AA01 AC03 DG08 EA10 EA11 EC01 EC03 EC10 FA03 FA30 GA01 GB01 GB10 HA01Z HB01X HC09X HE06X HF08Z HF12Z HF21Z HF26Z 3G093 AA05 BA09 BA21 BA22 CA02 CB06 DA06 DB05 DB12 DB15 DB23 EA02 EA05 EA13 EB04 FB03 3G301 JA35 KA04 KA13 KB01 LA01 P11ZA14A11 PA11A11A11 ND02A11 MA11B11A11 ND02

Claims (10)

[Claims] 1. An idle stop for automatically stopping an engine when a predetermined stop condition is satisfied, and for restarting the engine when a predetermined restart condition including depression of an accelerator pedal while the engine is automatically stopped is satisfied. In an engine automatic stop / restart device capable of executing a mode, a detection unit that detects that the predetermined restart condition is satisfied due to the depression of the accelerator pedal during automatic engine stop, and the detection unit When it is detected that the restart condition is satisfied, a sudden acceleration suppression control unit that executes a sudden acceleration suppression control of the vehicle, and an engine re-operation while the sudden acceleration suppression control is being executed by the sudden acceleration suppression control unit. An engine automatic stop / restart device comprising: a restart control unit that executes a start control. 2. The sudden acceleration suppression control means is configured to cancel the sudden acceleration suppression control when a depression release of the accelerator pedal is detected during execution of the sudden acceleration suppression control. The engine automatic stop / restart device according to claim 1. 3. The sudden acceleration suppression control means is configured to cancel the sudden acceleration suppression control when a lapse of a predetermined time is detected after the engine is restarted. Alternatively, the automatic engine stop / restart device according to the item 2. 4. The engine automatic stop restart according to claim 1, wherein the sudden acceleration suppression control means includes a torque suppression control means for performing engine torque suppression control. Starter. 5. The automatic engine stop / restart system according to claim 4, wherein the torque suppression control means controls the torque suppression control of the engine so as to gradually decrease over time. . 6. The rapid acceleration suppression control means includes a brake pressure increase control means for increasing brake pressure according to an accelerator opening.
The automatic engine stop / restart device according to any one of 1. 7. The engine automatic stop according to claim 6, wherein the brake pressure increase control means controls the brake pressure that has been pressure-increased so as to gradually decrease over time. Restart device. 8. The detecting means is configured not to detect the establishment of a restart condition when the accelerator pedal is depressed by a predetermined amount or more. The automatic engine stop / restart device described in. 9. An idle stop for automatically stopping the engine when a predetermined stop condition is satisfied, and for restarting the engine when a predetermined restart condition including depression of an accelerator pedal while the engine is automatically stopped is satisfied. In an engine automatic stop / restart device capable of executing a mode, detection means for detecting that the restart condition is satisfied due to depression of the accelerator pedal while the engine is automatically stopped, and the restart means by the detection means And a restart control means for executing restart control of the engine when the satisfaction of the condition is detected, and the detection means, when an abnormality occurs in the vehicle system, re-starts due to depression of the accelerator pedal. An automatic engine stop / restart device characterized in that it is configured not to detect the establishment of a start condition. 10. An idle stop for automatically stopping the engine when a predetermined stop condition is satisfied and for restarting the engine when a predetermined restart condition including depression of an accelerator pedal while the engine is automatically stopped is satisfied. In an engine automatic stop / restart device capable of executing a mode, a mode canceling means for canceling the idle stop mode is provided when the depression of the accelerator pedal and the depression of the brake are simultaneously detected while the engine is operating. An engine automatic stop / restart device characterized by.