JPH06317197A - Automatic stopping/starting device for engine - Google Patents

Abstract

PURPOSE:To avoid the possibility of an occurrence of an engine stall in order to ensure smooth starting, when the engine is automatically started with satisfaction of conditions for automatic start, by providing a means forbidding the automatic stop of the engine during a prohibition time after a depressed clutch pedal is released. CONSTITUTION:An automatic stopping/starting device 2 automatically stops/ starts an engine, with the aid of a control part 4 for automatic stopping/starting. When the engine is started with satisfaction of conditions for automatic start, the control part 4 for automatic stopping/starting assumes the control in such a way that automatic stopping of the engine is forbidden during a prohibition time after a clutch pedal, which has been depressed till then, is released. In other words, the control part 4 starts the counting to the prohibiting time as far as a clutch switch 10 is turned on but does not turn a stop relay 16 on during the prohibition time after the clutch switch 10 is turned off. Therefore, smooth starting is ensured, even if a somewhat longer time is needed for clutch operation.

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 / start device, and in particular, it is possible to prohibit the automatic stop of the engine at the time of starting, thereby enabling a reliable and smooth start of the vehicle traffic flow. The present invention relates to an engine automatic stop / start device that can avoid the inconvenience of delaying the engine.

[0002]

2. Description of the Related Art Some engines mounted on vehicles are equipped with an automatic stop / start device for reducing fuel consumption due to idling operation when the vehicle is stopped due to waiting for traffic lights, traffic congestion, or the like. The automatic stop / start device automatically stops the engine when the automatic stop condition is satisfied after the engine mounted on the vehicle is started, and automatically starts the engine when the automatic start condition is satisfied.

As such an automatic engine start / stop device, there is one disclosed in Japanese Patent Laid-Open No. 58-28565. The automatic stop / start control disclosed in this publication prohibits the automatic stop for a predetermined time after the automatic start condition is satisfied and the engine is automatically started, so that the automatic start / stop of the engine due to traffic congestion or the like can be prevented. This is to prevent frequent occurrence and to prevent battery exhaustion.

As an automatic engine stop / start device, there is one disclosed in Japanese Utility Model Publication No. 53-19317. The automatic stop / start device disclosed in this publication includes a first clutch switch that generates a first detection signal when the clutch pedal is depressed and a second clutch that generates a second detection signal when the clutch pedal is completely depressed. By providing a switch and automatically starting the engine when the first and second detection signals are generated and automatically stopping the engine when the first and second detection signals disappear, automatic operation is performed only when the clutch is completely connected. It is to stop.

[0005]

By the way, the driver is
When you try to start immediately after stopping the vehicle at an intersection or the like, depress the clutch pedal to prepare for starting.

However, for example, in an automatic engine starting / stopping device for automatically stopping the engine when the vehicle is stopped and the clutch pedal is not depressed, the vehicle is once stopped at an intersection or the like as described above. If you are preparing to start by depressing the clutch pedal in order to start immediately after starting, the moment you release the clutch pedal to start the stopped vehicle,
The engine will be controlled to stop automatically.

Therefore, the engine may cause an engine stall, and there is a disadvantage that a smooth start cannot be performed. Further, when the engine is automatically stopped in such a driving situation, there is a disadvantage that the flow of vehicle traffic is delayed because the engine cannot start. Therefore, in such a case, it is desirable that the engine be driven so that the automatic stop of the engine can be prohibited and the vehicle can start immediately.

[0008]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention automatically stops the engine if the automatic stop condition is satisfied after the engine mounted on the vehicle is started and the automatic start condition is set. If it is satisfied, in the engine automatic stop starter that automatically starts the engine, during the prohibited time after the clutch pedal that was being depressed when the engine was automatically started satisfying the automatic start condition was released and operated. Is provided with a control means for controlling so as to prohibit the automatic stop of the engine.

[0009]

According to the structure of the present invention, the automatic stop / start device, when the engine is automatically started by satisfying the automatic start condition by the control means, after the clutch pedal that has been depressed is released. During the prohibition time of, control is performed to prohibit the automatic stop of the engine. As a result, when the vehicle is once stopped at an intersection or the like and is preparing to start by depressing the clutch pedal in order to start immediately, even if the clutch pedal is released to start the stopped vehicle, Since the engine is controlled to be prohibited from being automatically stopped during the prohibition time after the clutch pedal is operated to be released, the engine is not automatically stopped unlike the conventional case.

[0010]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 6 show a first embodiment of the present invention. In FIG. 6, reference numeral 2 is an automatic stop / start device for an engine mounted on a vehicle (not shown). The automatic stop / start device 2 includes an automatic stop / start control unit 4 as a control means.
Is provided.

At the input side of the automatic stop / start control unit 4, a rotation sensor 6, a vehicle speed sensor 8, a clutch switch 10 and an E switch are provided.
The RS switch 12 and the electric load 14 are connected.

The rotation sensor 6 outputs an engine rotation signal corresponding to the engine speed as an engine state (not shown). The vehicle speed sensor 8 outputs a signal corresponding to the actual vehicle speed. The clutch switch 10 is turned on when the clutch pedal (not shown) is depressed, and turned off when the clutch pedal is released. The signal from the clutch switch 10 confirms the driver's intention to start / stop and serves as a switch at the time of restart.

The ERS switch 12 outputs a signal that determines whether the system is activated or deactivated. The electric load 14 is
An electric load signal is output when the air conditioner (A / C) (not shown) is on or when the headlight is on. Further, various devices are connected to the input side of the automatic stop / start control unit 4 to input an ignition (IG) signal and an ignition coil 28 and other signals.

The automatic stop / start device 2 causes the automatic stop / start control unit 4 to automatically stop the engine when the automatic stop condition is satisfied after the engine mounted on the vehicle is started, and also satisfies the automatic start condition. In the case, the engine is automatically started.

As a method of automatically stopping the engine,
There are a method of cutting the ignition signal, a method of cutting the fuel injection pulse, and a method of cutting both the ignition signal and the fuel injection pulse. Automatic stop starter 2 of this invention
Can be applied to any of the above cutting methods. Therefore, in the first embodiment, the method of cutting the fuel injection pulse is adopted as follows.

A stop relay 16 and a start relay 18 are connected to the output side of the automatic stop / start control unit 4. The stop relay 16 is interposed between the engine control unit 20 and the injector 22, and cuts the fuel injection pulse output from the engine control unit 20 to the injector 22 to stop the engine. The start relay 18 is interposed between the starter 24 and the battery 26, connects the starter 24 to the battery 26, and starts the engine.

The automatic stop / start device 2 causes the automatic stop / start control unit 4 to automatically stop the engine if the automatic stop condition is satisfied after the engine mounted in the vehicle (not shown) is started and the automatic start condition is set. When satisfied, the engine is automatically started.

More specifically, the automatic stop / start control unit 4 has a rotation sensor 6 and a vehicle speed sensor 8 for detecting an operating state on the input side.
Various detection signals are input from the clutch switch 10, the ERS switch 12, and the electric load 14, and the automatic stop condition and the automatic start condition of the engine are judged by these various detection signals, and the stop relay 16 or the start relay on the output side is determined. A control signal is output to 18 to automatically stop / start the engine.

In the automatic stop / start device 2, the automatic stop / start control unit 4 operates to release the clutch pedal that was being depressed when the automatic start condition is satisfied and the engine is automatically started. During the later prohibition time, control is performed to prohibit the automatic stop of the engine.

Next, the operation of the first embodiment will be described.

The automatic stop / start device 2 is controlled by the automatic stop / start control unit 4 based on the operating states of the vehicle and the engine after the engine mounted on the vehicle (not shown) is started.
When the automatic stop condition is satisfied, the engine is automatically stopped, and when the automatic start stop condition is satisfied, the engine is automatically started.

The automatic stop / start control unit 4 of the automatic stop / start device 2 executes control as shown in FIG. The automatic stop / start control unit 4 operates when the ignition switch (not shown) of the engine is turned on, and the main (step 10
Program 0) starts.

First, it is determined whether the ERS switch 12 is on (step 102). If this determination (step 102) is YES, that is, if the ERS switch 12 is on, the process proceeds to a determination (step 104) whether or not the start relay 18 is on. If the determination (step 102) is NO, that is, if the ERS switch 12 is off, the stop relay 16 and the start relay 18 are both turned off (step 138), and the process returns to the determination (step 102).

If the judgment (step 104) is YES, it is judged whether the engine speed N for judging whether the start relay 18 is off is equal to or higher than a predetermined speed N1 (for example, 500 rpm) (step 132). Move to.
If the determination (step 104) is NO, the process proceeds to determination (step 106) and (step 108) to determine whether to prohibit the automatic stop.

The judgment (step 106) is made by the vehicle speed sensor 8
Is a failure condition, and it is determined whether the vehicle speed sensor 8 is in error. The determination (step 108) is based on the prohibition condition that the electrical load signal is being input by the operation of the electrical load 14, and determines whether or not the electrical load 14 is on.

The above judgment that the prohibition condition is satisfied (step 1
If 06.108) is YES, the stop relay 16
Is turned off (step 124). If the above determination (steps 106 and 108) that the prohibition condition is not satisfied is NO, the process proceeds to a determination (step 110) whether the stop relay 16 is on.

When the stop relay 16 is on and the determination (step 110) is YES, the ignition (IG) signal of the ignition coil (not shown) is used for a predetermined time t2 (for example, to determine whether the stop relay 16 is off).
0.2 seconds) Judgment as to whether or not there is no input (step 1
22). When the stop relay 16 is off and the determination (step 110) is NO, it is determined whether or not the vehicle speed signal is in a non-input state for a predetermined time t1 (for example, 1 second) to confirm the stop of the vehicle (step). 112)
Move to.

If this determination (step 112) is YES, it is determined whether or not the clutch switch 10 is off to confirm the driver's willingness to start (step 11).
4) Do. The clutch switch 10 is turned on when the clutch pedal is depressed, and turned off when the clutch pedal is released.

When the clutch switch 10 is on and the determination (step 114) is NO, it is assumed that the driver has a will to start, and the prohibition time t0 is set and the counting of the prohibition time t0 is started (step). 116) is performed. Judgment when clutch switch 10 is off (step 11
If 4) is YES, it is determined whether the prohibition time t1 has elapsed since the clutch switch 10 was turned off (step 118).

If this determination (step 118) is YES, it is assumed that the driver has no intention of starting, and the stop relay 16 is turned on (step 120) to cut the fuel injection pulse and stop the engine. To do.

On the other hand, the judgment (step 112) is NO.
If the determination (step 114) is YES and the determination (step 118) is NO, that is, if the vehicle is traveling or if the clutch switch 10 is on and the prohibition time t0 has not elapsed, the start relay In order to determine that the 18 is turned on, the ignition (IG) signal is set for a predetermined time t3.
(For example, 0.5 seconds) The process shifts to a determination as to whether or not there is no input (step 126).

After the stop relay 16 is turned on (step 120), it is determined whether or not the ignition (IG) signal is in a non-input state for a predetermined time t2 (for example, 0.2 seconds) (step 122). Move to. If this determination (step 122) is YES, it is determined that the engine has completely stopped, and the stop relay 16 is turned off (step 124). This judgment (Step 12
If 2) is NO, the stop relay 16 is turned on until the ignition (IG) signal is in the non-input state for the predetermined time t3 (steps 102 to 110-122).

After the stop relay 16 is turned off (step 124), the ignition (IG) signal is not input for a predetermined time t3 (for example, 0.5 seconds) in order to determine whether to restart. It is determined whether or not it is in the state (step 126) and whether or not the clutch switch 10 is on (step 128).

These judgments (steps 126 and 128)
When is NO, it is considered that there is no intention to start, and the process returns to the determination (step 102). Judgment (Step 126.1
If both 28) are YES, it is determined that the clutch pedal is depressed while the engine is stopped and the driver intends to start, and the start relay 18 is turned on (step 1
30) and start restarting.

In order to determine whether the restart is completed by the process of turning on the start relay 18 (step 130), the engine speed N is set to a predetermined speed N1 (for example,
It is determined whether the speed is 500 rpm or more (step 13).
2) Then, it is determined whether or not the clutch switch 10 has been turned on for a predetermined time t4 (for example, 0.1 seconds) (step 13).
4) Do.

If the judgment (step 132) is YES, the process for turning off the start relay 18 (step 1)
36) and returns to the judgment (step 102). Even if the determination (step 132) is NO, if the determination (step 134) is NO, the process of turning off the start relay 18 (step 136) is performed, and the process returns to the determination (step 102). That is, when the engine speed N is equal to or higher than the predetermined speed N1, or when the clutch pedal is released and the clutch is engaged, it is determined that the restart is completed and the start relay 18 is turned off. Is.

On the other hand, the judgment (step 132) is NO.
If the determination (step 134) is YES, the process returns to the determination (step 102), and the start relay 18 is turned on until the restart or the clutch is connected (step 1).
02-104-132-134).

As described above, the automatic stop / start device 2 is controlled by the automatic stop / start control unit 4 at the timing shown in FIG.

In this way, the automatic stop / start device 2 causes the automatic stop / start control unit 4 to automatically stop / start the engine. The automatic stop / start control unit 4 automatically stops the engine during a prohibition time t0 after the clutch pedal that was being depressed is released when the engine is automatically started when the automatic start condition is satisfied. Control to prohibit.

That is, the automatic stop / start control unit 4 starts counting the inhibition time t0 while the clutch switch 10 is on, and turns on the stop relay 16 during the inhibition time t0 after the clutch switch 10 is turned off. By controlling so that the clutch does not operate, even if it takes some time to operate the clutch, it is possible to start without automatically stopping the clutch.

As a result, when the vehicle is temporarily stopped at an intersection or the like and then is preparing to start by immediately depressing the clutch pedal in order to immediately start the vehicle, the clutch pedal is released and operated to start the stopped vehicle. However, since the engine is controlled to be prohibited from being automatically stopped during the prohibition time t0 after the clutch pedal is operated to be released, the engine is not automatically stopped as in the conventional case.

Therefore, it is possible to prevent the engine from stalling when starting the vehicle immediately after the vehicle is once stopped at an intersection or the like, so that it is possible to avoid the risk of causing an engine stall. In addition, the engine stall does not prevent the vehicle from starting and the flow of vehicle traffic is not delayed.

Further, the engine is not automatically stopped immediately even in the half-clutch state, so that a more reliable and smooth start can be secured. Furthermore, it suffices to provide a clutch switch as a detection means, which allows the driver's intention to be clearly understood, and the automatic stop of the engine when starting immediately after stopping the vehicle at an intersection or the like is surely prohibited. Can be done.

FIG. 3 shows a second embodiment of the present invention.

In the first embodiment, the prohibition time t0 is set.
Is set to be constant, the prohibition time t0 can be changed depending on conditions. For example, when considering the time during which the clutch pedal is being depressed, if the depression operation time is long while the vehicle is stopped, the driver intends to start, and if the depression operation time is short, the driver starts. It is thought that there is no will.

Therefore, in the automatic stop / start device 2 of the second embodiment, the prohibition time t0 is set in accordance with the depression operation time t5 until the clutch pedal, which has been depressed when the engine is automatically started, is released. It is something to set.

That is, the automatic stop / start control unit 4 sets the clutch pedal depressing operation time t5 as a condition, and as shown in FIG. 5, when the depressing operation time t5 is long, it is determined that the driver intends to start, and the prohibition time t0. Is set to be long, and when the depression operation time t5 is short, the prohibition time t0 is set to be short because the driver does not intend to start, and during this prohibition time t0, the automatic stop of the engine is prohibited.

The prohibition time t0 between the sections a and b in FIG. 5 is set to a constant value instead of 0 in order to secure the minimum time necessary for starting regardless of the stepping operation time t5. is there. In addition, the prohibition time t0 between the sections cd in FIG. 5 is set to a constant value. If the prohibition time t0 that is longer than this value is set, the fuel efficiency is hindered and the function of the automatic stop / start device 2 is exerted. Because it will damage.

Next, the operation of the second embodiment will be described. In addition,
This second embodiment corresponds to step 1 of the flowchart of FIG.
12-124 can be changed and implemented. Therefore, in the second embodiment, steps 100 to 110 and steps 126 to 13 which are the same as those in the flowchart of FIG. 1 are performed.
8 will be omitted, and description will be given with reference to FIG. 3 in which steps 140 to 144 are added to steps 112 to 124.

In the second embodiment, first, as in FIG. 1, the main (step 100) program is started to make a determination (steps 102 to 110), and then the vehicle speed signal is transmitted for a predetermined time t1 (. For example, it is judged whether or not there is no input for 1 second (step 112).
Is done.

In the second embodiment, after this judgment (step 112) is YES, the process of adding the measurement counter for the stepping operation time t5 which is the elapsed time after the clutch pedal is stepped on (step 140).
Then, in order to confirm the depression operation of the clutch pedal, it is determined whether or not the clutch switch 10 is off (step 114).

When the clutch pedal is being depressed and the determination (step 114) is NO, the inhibition time t0 is set (step 144) from the current depression operation time t5 according to the relationship of FIG. 5, and the subsequent processing (step 144) is performed. 12
6 to 136).

When the clutch pedal, which has been depressed, is released, and the determination is YES (step 114), the measurement counter for the depression operation time t5 is cleared (step 142), and the depression until the release operation is performed. Until the prohibition time t0 set according to the relationship of FIG. 5 elapses from the operation time t5 (step 118: NO), the stop relay 16 is turned on (step 12).
Do not do 0).

When the set prohibition time t0 has elapsed (step 118: YES), the stop relay 16
(Step 120), the subsequent processing (steps 122 to 136) is performed.

As described above, according to the second embodiment, the counter is incremented while the clutch pedal is being depressed, and the inhibition time t0 is set according to the depression operation time t5.
The settings have been updated.

As a result, the same effect as that of the first embodiment can be obtained, and further, the inhibition time t0 is set according to the depression operation time t5 until the clutch pedal that has been depressed is released. Therefore, the prohibition time of the engine automatic stop can be set so as to comply with the driver's willingness to start, and the engine automatic stop can be more accurately prohibited.

FIG. 4 shows a third embodiment of the present invention.

In the second embodiment described above, the inhibition time t0 is set according to the depression operation time t5 until the clutch pedal that has been depressed is released.
In the third embodiment, in order to ensure a more reliable and smooth start, the inhibition time t0 is set in consideration of the depression operation state of the accelerator pedal to the depression operation time t5.

In the third embodiment, the throttle sensor 30 for detecting the opening degree of the throttle valve (not shown) and the throttle valve (not shown) are set to the idle opening degree when the accelerator pedal is depressed. The idle switch 32 for detecting the
Is connected to the input side of the throttle sensor 30 and the idle switch 30 to input a throttle (THR) signal and an idle (Id) signal to set the depression operation time t5 and the inhibition time t0 according to the accelerator pedal depression operation state. It is a thing.

Next, the operation of the third embodiment will be described. In addition,
This third embodiment corresponds to step 1 of the flowchart of FIG.
Since steps 12 to 124 can be modified and implemented, the description of steps 100 to 110 and steps 126 to 138 which are the same as those in the flowchart of FIG.
FIG. 4 in which steps 140 to 148 are added to steps 12 to 124
Will be described.

In the third embodiment, first, as in FIG. 1, the main (step 100) program is started to make a determination (steps 102 to 110), and then the vehicle speed signal is transmitted for a predetermined time t1 ( For example, it is judged whether or not there is no input for 1 second (step 112).
Is done.

In the third embodiment, after the determination (step 112) is YES, the process of adding the measurement counter for the stepping operation time t5 which is the elapsed time from the stepping operation of the clutch pedal (step 140).
Then, in order to confirm the depression operation of the clutch pedal, it is determined whether or not the clutch switch 10 is off (step 114).

When the clutch pedal is being depressed and the determination (step 114) is NO, the prohibition time t0 is set (step 144) from the current depression operation time t5 according to the relationship of FIG. 5, and the subsequent processing (step 12
6 to 136). The counter is incremented while the clutch pedal is being depressed, and the setting of the inhibition time t0 is updated according to the depression operation time t5.

When the clutch pedal that was being depressed is released and the determination is YES (step 114), the measurement counter for the depression operation time t5 is cleared (step 142), and the accelerator pedal is depressed. It is determined whether or not (step 146).

In this judgment (step 146), for example, when the accelerator pedal is depressed and the idle switch 30 is off (no Id signal input) (step 146: OFF), the judgment (118) is executed. Transition. On the other hand, in the determination (step 146), for example, when the accelerator pedal is not depressed and the idle switch 30 is on (the Id signal is input) (step 146: ON), the prohibition time t0 is extended. Processing (step 148) is performed.

As described above, the inhibition time t0 set according to the relationship of FIG. 5 from the depression operation time t5 until the clutch pedal is released is extended and set according to the depression state of the accelerator pedal.

Next, in the judgment (118), it is judged whether or not the clutch pedal depression operation time t5 and the prohibition time t0 set according to the accelerator pedal depression state have elapsed. Until the prohibition time t0 elapses (step 118: NO), the stop relay 1
The process of turning on 6 (step 120) is not performed. The set prohibition time t0 has elapsed (step 118: YES).
If so, the process proceeds to the process of turning on the stop relay 16 (step 120), and the subsequent process (steps 122 to 1).
36).

As described above, in the third embodiment,
Before the determination of the elapse of the prohibited time t0 (step 118),
Prohibition time t0 when the accelerator pedal is depressed
Has been provided with a process for extending.

As a result, the same effects as those of the first and second embodiments can be obtained, and further, the depression operation time t until the clutch pedal, which has been depressed, is released.
5 and the prohibition time t0 are set according to the depression operation state of the accelerator pedal, it is possible to more reliably set the prohibition time of the automatic stop of the engine so as to meet the driver's willingness to start. The automatic stop can be prohibited according to the intention of the driver.

In the third embodiment, the prohibition time t0 is extended to a certain extent by the idle (Id) signal, but the throttle (THR) signal of the throttle sensor 32 is used to adjust the depression speed of the accelerator pedal. The extension time can be changed, or the extension time can be changed according to the depression amount of the accelerator pedal.
As a result, the prohibition time can be accurately set so as to further comply with the driver's intention, and the automatic stop can be more effectively prohibited, and the drivability can be improved.

[0072]

As described above, according to the present invention, the engine is automatically stopped as in the prior art even when the vehicle is temporarily stopped at an intersection or the like, and then the clutch pedal depressed to immediately start the vehicle is released. There is nothing to do.

Therefore, it is possible to prohibit the automatic stop of the engine when the vehicle starts immediately after it is stopped at an intersection or the like, avoid the possibility of causing an engine stall, and ensure a smooth and smooth start. Can be
It is possible to avoid the inconvenience of stopping the flow of vehicle traffic. In addition, the engine is not automatically stopped immediately even in the half-clutch state, and a more reliable and smooth start can be secured. Furthermore, it suffices to provide a clutch switch as a detection means, which allows the driver's intention to be clearly understood, and the automatic stop of the engine when starting immediately after stopping the vehicle at an intersection or the like is surely prohibited. Can be done.

[Brief description of drawings]

FIG. 1 is a control flowchart showing a first embodiment of an automatic stop / start device according to the present invention.

FIG. 2 is a control timing chart showing the first embodiment of the automatic stop / start device according to the present invention.

FIG. 3 is a flow chart of a main part of control showing a second embodiment of an automatic stop / start device according to the present invention.

FIG. 4 is a flow chart of a main part of control showing a third embodiment of the automatic stop / start device according to the present invention.

FIG. 5 is a diagram showing a relationship between a depression operation time of a clutch pedal and a prohibition time.

FIG. 6 is a schematic configuration diagram of an automatic stop / start device.

[Explanation of symbols]

 2 Automatic stop / start device 4 Automatic stop / start control unit 6 Rotation sensor 8 Vehicle speed sensor 10 Clutch switch 12 ERS switch 14 Electric load 16 Stop relay 18 Start relay 20 Engine control unit 22 Injector 24 Starter 26 Battery

[Procedure amendment]

[Submission date] June 16, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

Claims (3)

[Claims] 1. An automatic stop / start device for an engine, which automatically stops the engine when the automatic stop condition is satisfied after starting the engine mounted on a vehicle and automatically starts the engine when the automatic start condition is satisfied, wherein A control means is provided to control the automatic stop of the engine during the prohibition time after the clutch pedal that was being depressed when the engine was automatically started to satisfy the automatic start condition was released. Characteristic engine automatic stop and starter. 2. The control means sets the prohibition time according to a depression operation time until a clutch pedal, which has been depressed when the engine is automatically started to satisfy the automatic start condition, is released. The automatic engine stop / start device for an engine according to claim 1, which is a control means for controlling. 3. The control means sets a depression operation time until the clutch pedal, which has been depressed when the engine is automatically started to satisfy the automatic start condition, until it is released, and an accelerator pedal depression operation state. The automatic engine starting / stopping device according to claim 1, which is a control unit that sets the prohibition time accordingly.