JP2000220488A - Automatic stopping and starting system for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the fuel consumption rate from deteriorating and an internal combustion engine from being unable to restart by prohibiting an automatic stop control when a prescribed automatic stop prohibiting condition is established in the establishment of an automatic stop condition, and changing the automatic stop prohibiting condition according to the use record of an element concerning the starting of the internal combustion engine. SOLUTION: A CPU 29 judges whether the automatic stop condition of an internal combustion engine is established or not. When the establishment of the automatic stop condition is judged, the CPU 29 judges whether the prohibiting condition of automatic stop control is established or not. When the non-establishment of the prohibiting condition of automatic stop control is judged, the CPU 29 executes the automatic stop control of the internal combustion engine. The CPU 29 executes the changing processing of automatic stop prohibiting condition. The CPU 29 changes the automatic stop prohibiting condition so as to keep the durability of a starter motor up to the expiration of the estimated durable years and stores a new automatic stop prohibiting condition in a backup RAM 32. According to this, the deterioration of the fuel consumption rate to prevent the internal combustion engine from being unable to restart.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for automatically stopping and starting an internal combustion engine mounted on an automobile or the like when predetermined conditions are satisfied.

[0002]

2. Description of the Related Art In recent years, the operation of an internal combustion engine has been automatically stopped when the vehicle is stopped such as at a traffic light for the purpose of reducing fuel consumption, exhaust emission, or noise of the internal combustion engine mounted on an automobile or the like. An automatic stop / start device that automatically restarts an internal combustion engine when a vehicle starts moving is being developed.

[0003] In such an automatic stop / start device, the internal combustion engine is started by a starter motor operated by electric power stored in a power storage device such as a battery. Therefore, every time the vehicle stops and starts, the internal combustion engine is automatically started. When the stop and the automatic start are repeated, the load on the auxiliary equipment such as the power storage device and the starter motor increases, and the deterioration or failure of the auxiliary equipment is induced. It becomes difficult to start.

[0004] In order to solve such a problem, an "automatic engine start / stop device" as described in JP-A-6-257483 has been proposed. This automatic start / stop device is used when the automatic stop condition is satisfied, and the cumulative value of the travel distance of the vehicle from the time of the immediately preceding automatic start to the time of the present automatic stop condition or the cumulative value of the travel time at a predetermined speed or more is a predetermined value. The automatic stop control is permitted only when the engine speed exceeds the standard, and the automatic stop control is prohibited by prohibiting the automatic stop control when the running distance or the cumulative running time is equal to or less than a predetermined standard. To prevent performance degradation due to insufficient charging of the power storage device, deterioration of the starter motor, and the like.

[0005]

However, in the above-described automatic start / stop device, the automatic stop control is prohibited based on a certain standard regardless of the frequency and time of use of the power storage device and the starter motor. When the use frequency and use time of the device and the starter motor are small and there is almost no performance deterioration, the automatic stop control is uselessly prohibited and the fuel consumption rate is deteriorated. When the usage time is long and the performance is significantly deteriorated, the prohibition of the automatic stop control may be insufficient and the start may not be possible.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and is directed to a device for performing automatic stop control and automatic start control of an internal combustion engine under predetermined conditions, such as a power storage device or a starter motor. By providing a technique for prohibiting automatic stop control according to the frequency of use of auxiliary equipment related to automatic start, it is possible to prevent deterioration of the fuel consumption rate and prevent the internal combustion engine from being unable to restart. Aim.

[0007]

The present invention employs the following means in order to solve the above-mentioned problems. That is,
An automatic stop / start device for an internal combustion engine according to the present invention automatically stops the internal combustion engine when an automatic stop condition is satisfied, and automatically restarts the internal combustion engine when the automatic start condition is satisfied. Automatic stop prohibition means for prohibiting automatic stop control by the automatic stop / start means when a predetermined automatic stop prohibition condition is satisfied when the automatic stop condition is satisfied, and according to a use history of an element related to the start of the internal combustion engine. Prohibition condition changing means for changing the automatic stop prohibition condition.

In the automatic stop / start device for an internal combustion engine thus configured, when the automatic stop condition of the internal combustion engine is satisfied, the automatic stop prohibiting means determines whether the automatic stop prohibition condition is satisfied. .

When the automatic stop prohibition condition is not satisfied, the automatic stop prohibition means permits the automatic stop / start means to execute the automatic stop control of the internal combustion engine. The automatic stop / start means having received the permission to execute the automatic stop control automatically stops the operation of the internal combustion engine.

When the automatic stop prohibition condition is satisfied, the automatic stop prohibition means prohibits the automatic stop / start means from executing the automatic stop control of the internal combustion engine. The automatic stop / start means which has been prohibited from executing the automatic stop control does not stop the operation of the internal combustion engine.

The automatic prohibition condition changing means changes the automatic stop prohibition condition in accordance with the use history of the element related to the start of the internal combustion engine. For example, the automatic stop prohibition condition changing means,
If the frequency or use time of the elements related to the start of the internal combustion engine is small, the automatic stop prohibition condition is changed so that the prohibited area of the automatic stop control is reduced (the execution area of the automatic stop control is expanded). If the use frequency or use time of the element is large, the automatic stop prohibition condition is changed so that the prohibition area of the auto stop control is expanded (the execution area of the auto stop control is reduced).

In this case, if the use frequency and use time of the element related to the start of the internal combustion engine are small and the performance deterioration of the element related to the start is small, the execution area of the automatic stop control is expanded. The automatic stop control is not prohibited when the internal combustion engine is ready to start.

On the other hand, if the frequency and use time of the elements related to the start of the internal combustion engine are large and the performance of the elements related to the start is greatly reduced, the execution area of the automatic stop control is reduced. The execution of the automatic stop control is not permitted when the engine cannot be started.

The elements related to the start of the internal combustion engine referred to here include, for example, a starter motor for cranking the internal combustion engine, a power storage device for supplying drive power to the starter motor, or power for accumulating in the power storage device. An alternator or the like that generates power is shown.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of an automatic stop / start apparatus for an internal combustion engine according to the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine to which the automatic stop / start device according to the present invention is applied. The internal combustion engine 1 shown in FIG. 1 is a multi-cylinder water-cooled gasoline engine having a plurality of cylinders. A transmission (T / M) 200 is connected to the internal combustion engine 1 via a clutch mechanism (or a torque converter) 100. The transmission (T / M) 200 is connected via a propeller shaft (not shown), a differential gear, or the like. It is connected to the driving wheels.

In the power transmission system configured as described above, when the clutch mechanism 100 is in the engaged state, the internal combustion engine 1
The torque of the output shaft (crankshaft) (not shown) of the transmission (T /
M) transmitted to 200, transmission (T / M)
At 200, the speed is reduced or increased, and then transmitted from the transmission (T / M) 200 to drive wheels via a propeller shaft, a differential gear, and the like.

Next, an intake branch pipe 2 is connected to the internal combustion engine 1, and each branch pipe of the intake branch pipe 2 communicates with a combustion chamber (not shown) of each cylinder via an intake port. The intake branch pipe 2 is connected to a surge tank 3, and the surge tank 3 is connected to an intake pipe 4.
Through the air cleaner box 5.

In the intake system configured as described above, fresh air taken into the air cleaner box 5 is supplied to the surge tank 3 via the intake pipe 4 and then distributed from the surge tank 3 to each branch pipe of the intake branch pipe 2. The fuel is supplied from each branch pipe to the combustion chamber of each cylinder via an intake port.

An air flow meter 6 for outputting an electric signal corresponding to the mass of fresh air flowing in the intake pipe 4 is mounted in the middle of the intake pipe 4. A vacuum sensor 12 that outputs a corresponding electric signal is attached.

The intake pipe 4 downstream of the air flow meter 6 has:
A throttle valve 7 for adjusting the flow rate of fresh air flowing in the intake pipe 4 is provided. The throttle valve 7 includes an actuator 8 that includes a stepper motor or the like and drives the opening and closing of the throttle valve 7 according to the magnitude of the applied current, and a throttle position sensor 9 that outputs an electric signal corresponding to the opening of the throttle valve 7. And are attached.

Subsequently, an accelerator lever (not shown) that rotates in conjunction with an accelerator pedal 10 installed in the vehicle compartment is attached to the throttle valve 7, and the accelerator lever has a rotation amount of the accelerator lever. (Electric signal according to the amount of depression of accelerator pedal 10)
Is attached.

Each of the branch pipes of the intake branch pipe 2 has a fuel injection valve 13a, 13b, 13 so that its injection hole faces the intake port.
c and 13d (hereinafter collectively referred to as fuel injection valves 13) are attached. A fuel distribution pipe 14 is connected to these fuel injection valves 13, and the fuel distribution pipe 14 is connected to a fuel pump (not shown).

Each fuel injection valve 13 is provided with the fuel injection valve 13.
Drive circuits 15a, 15b, 15c, 15
d (hereinafter collectively referred to as the drive circuit 15). In the fuel injection system configured as described above, the fuel discharged from the fuel pump is supplied to the fuel distribution pipe 14 and then distributed from the fuel distribution pipe 14 to each fuel injection valve 13.
When a drive current is applied from the drive circuit 15 to the fuel injection valve 13, the fuel injection valve 13 opens and the fuel distribution pipe 1
4 is injected into the intake port.

On the other hand, an exhaust branch 16 is connected to the internal combustion engine 1, and each branch of the exhaust branch 16 communicates with a combustion chamber of each cylinder via an exhaust port (not shown). The exhaust branch pipe 16 is connected to an exhaust pipe 17 and the exhaust pipe 17
Is connected to a muffler (not shown) downstream.

An exhaust gas purifying catalyst 18 for purifying harmful gas components such as CO, NO _X and HC contained in the exhaust gas discharged from the internal combustion engine 1 is provided in the exhaust pipe 17. As the exhaust purification catalyst 18 can be exemplified three-way catalyst, oxidation catalyst, a selective reduction type NO _X catalyst or a storage reduction NO _X catalyst.

In the exhaust system configured as described above, the exhaust gas discharged from the internal combustion engine 1 is guided to the exhaust pipe 17 through the exhaust branch pipe 16, and is exhausted by the exhaust purification catalyst 18 in the exhaust pipe 17. After the harmful gas components contained in the air are purified, they are released to the atmosphere via a muffler (not shown).

Exhaust pipe 1 upstream of the exhaust purification catalyst 18
An air-fuel ratio sensor 19 that outputs an electric signal corresponding to the air-fuel ratio of the exhaust gas flowing through the exhaust pipe 17 is attached to 7.

Next, the internal combustion engine 1 is provided with a crank position sensor 2 for outputting a pulse signal each time a crankshaft (not shown) rotates a predetermined angle (for example, 10 degrees).
0 and a water temperature sensor 21 that outputs an electric signal corresponding to the temperature of the engine cooling water.

The internal combustion engine 1 or the clutch mechanism 100
A starter motor 300 having a pinion gear that meshes with a ring gear provided on the circumference of a flywheel (or drive wheel) (not shown) attached to the tip of the crankshaft is attached to the motor. When the internal combustion engine 1 is started, the starter motor 300 operates using the battery 500 as a drive source. At that time, the torque of the starter motor 300 is transmitted to the crankshaft via the pinion gear and the flywheel, and the starter motor 300 Rankings are being performed.

Further, the internal combustion engine 1 is provided with a power generating mechanism 400 connected via a belt to a crank pulley (not shown) mounted on the base end of the crankshaft. The power generation mechanism 400 includes, for example, an alternator, a regulator, a controller, and the like.

Next, the internal combustion engine 1 has an electronic control unit (Electronic Control Unit: ECU) 22 for controlling the engine.
Is attached. The ECU 22 includes the air flow meter 6, the throttle position sensor 9, the accelerator position sensor 11, the vacuum sensor 12,
In addition to the air-fuel ratio sensor 19, the crank position sensor 20, the water temperature sensor 21, and the power generation mechanism 400, a shift position sensor 23 for detecting the position of a shift lever installed in the vehicle interior, and a brake switch for detecting operation / non-operation of a brake pedal 24, a vehicle speed sensor 25 for detecting the running speed of the vehicle, and a state of charge of the battery 500 (State Of Cha)
Various sensors such as an SOC controller 28 for calculating rge) are connected via electric wiring, and output signals of the various sensors are input to the ECU 22. further,
The ECU 22 includes a starter switch (ST.SW) 26
ON / OFF signal and an ignition switch (IG.
SW) 27 on / off signal.

On the other hand, the ECU 22, the actuator 8, the drive circuit 15, the starter motor 300, the power generation mechanism 4
00 and the like are connected via electrical wiring, and the ECU 22 uses the output signals of the various sensors described above as parameters to set the actuator 8, the drive circuit 15, the starter motor 300,
Alternatively, it is possible to transmit a control signal to the power generation mechanism 400 and the like.

Here, as shown in FIG. 2, the ECU 22 is connected to a CP which is interconnected by a bidirectional bus 37.
U29, ROM30, RAM31, and backup RAM
32. The bidirectional bus 37 has A /
The first input interface circuit 33 is connected via the D converter 36, and the second input interface circuit 34 and the output interface circuit 35 are connected.

The first input interface circuit 33 connects the air flow meter 6, the throttle position sensor 9, the accelerator position sensor 11, the vacuum sensor 12, the water temperature sensor 21, the air-fuel ratio sensor 19, the SOC controller 28, and the electric wiring to the power generation mechanism 400. And outputs the output signal of each sensor, the voltage generated by the power generation mechanism 400, and the like, and inputs these signals to the A / D converter 36.

The A / D converter 36 converts various signals input from the first input interface circuit 33 from an analog signal format to a digital signal format, and transmits the signals to the CPU 29 and the RAM 31 via the bidirectional bus 37.

The second input interface circuit 34 includes the crank position sensor 20 and the shift position sensor 2
3, connected to the brake switch 24, the vehicle speed sensor 25, the starter switch 26, and the ignition switch 27 via electric wiring, and input the output signal of each sensor;
These output signals are sent to the CPU 2 via the bidirectional bus 37.
9 and the RAM 31.

The output interface circuit 35 is connected to the actuator 8, the drive circuit 15, the starter motor 300, and the controller of the power generation mechanism 400 via electric wiring, and outputs various control signals output from the CPU 29 to the actuator 8, The signal is transmitted to the drive circuit 15, the starter motor 300, or the controller of the power generation mechanism 400.

The ROM 30 is a fuel injection amount control routine for determining a fuel injection amount to be injected from each fuel injection valve 13, and a fuel injection timing control routine for determining a timing for injecting fuel from each fuel injection valve 13. Various application programs, such as an ignition timing control routine for determining the ignition timing of each cylinder, a throttle opening control routine for determining the opening of the throttle valve 7, and various control maps are stored.

The control map stored in the ROM 30 includes, for example, a fuel injection amount control map showing the relationship between the operating state of the internal combustion engine 1 and the fuel injection amount, and the relationship between the operating state of the internal combustion engine 1 and the fuel injection timing. A fuel injection timing control map, an ignition timing control map showing the relationship between the operating state of the internal combustion engine 1 and the ignition timing, a depression amount of the accelerator pedal 10 (accelerator opening) and a target opening of the throttle valve 7 (target throttle opening) And the like.

Further, in the ROM 30, predetermined expected service life of the vehicle: T, assumed service life of the vehicle: L, and assumed service life of the starter motor 300: C
Etc. are stored.

The RAM 31 stores an output signal from each sensor, a calculation result of the CPU 29, and the like. The above operation result is
For example, the engine speed is calculated based on the output signal of the crank position sensor 20. An output signal from each sensor, a calculation result of the CPU 29, and the like are updated to the latest data every time the crank position sensor 20 outputs a pulse signal.

The backup RAM 32 is a non-volatile memory that retains data even after the engine is stopped. For example, the total actual traveling distance of the vehicle from the time of the new vehicle to the present time: l
And the total elapsed time from the start of the new vehicle to the present time: t. Further, in the backup RAM 32, an eco-run counter storage area for storing a count value of an eco-run counter for counting the number of executions of the automatic stop control from the time of the new vehicle: c is set.

The CPU 29 operates in accordance with an application program stored in the ROM 30, executes fuel injection control, ignition control, throttle control, and the like using output signals of various sensors as parameters, and automatically stops and starts according to the gist of the present invention. Execute control.

The automatic stop / start control in this embodiment will be described below. In automatic stop / start control,
The CPU 29 executes an automatic stop control routine as shown in FIG.

In the automatic stop control routine, the CPU 29
First, in S301, the ignition switch 2
7 to determine whether or not the ignition switch 27 is on.

If it is determined in step S301 that the ignition switch 27 is on, the CPU
In step S302, the process proceeds to step S302, where the total running distance: 1, the total elapsed time: t, and the count value of the eco-run counter: c are read from the backup RAM 32.

In S303, the CPU 29 executes the processing in S30.
It is determined whether or not the total actual travel distance: l input in step 2 exceeds a distance (reference change distance) in which the automatic stop control prohibition condition should be changed.

If it is determined in step S303 that the total actual traveling distance: l exceeds the reference change distance, the CPU 29 proceeds to step S304, reads the assumed service life of the vehicle: Y from the ROM 30, and reads the total actual traveling distance: Y. mileage: l, the total elapsed time: t, and the assumed lifetime: Y and total travel distance that would reach after assumed life based on (estimated total travel distance): estimates the L _Y.

Subsequently, in S305, the CPU 29
Is the estimated total mileage: L _Y estimated in S304.
And the total actual travel distance: l and the count value of the eco-run counter: c, the count value (estimated count value) of the eco-run counter after the lapse of the assumed useful life: _CY is estimated.

In S306, the CPU 29 executes
Is read out from the starter motor 300, and the estimated count value calculated in S305 is: C
It is determined whether or not _Y exceeds the assumed service life count: C.

[0052] The estimated count value in the S306: C _Y is the assumed service life times: If it is determined that the C or less, CPU 29 is the durability of the starter motor 300 to assume the service life of the vehicle has passed It is estimated that it can be maintained, and the process proceeds to S308.

In S308, the CPU 29 determines whether the internal combustion engine 1
It is determined whether or not the automatic stop condition is satisfied. As the automatic stop condition, for example, the shift position sensor 2 in which the output signal value (vehicle speed) of the vehicle speed sensor 25 is “0”
3. The output signal value of the accelerator position sensor 11 is a signal indicating the "neutral position", the engine speed calculated based on the output signal value of the crank position sensor 20 is equal to or less than a predetermined speed, For example, it is a signal indicating that "the depression amount of the accelerator pedal 10 is zero".

If it is determined in S308 that the automatic stop condition is not satisfied, the CPU 29 temporarily terminates the execution of this routine. On the other hand, if it is determined in S308 that the automatic stop condition is satisfied,
U29 proceeds to S309, and determines whether or not a prohibition condition for the automatic stop control is satisfied. Examples of the prohibition condition of the automatic stop control include, for example, a case where the travel distance of the vehicle from the time of execution of the last automatic start control to the time of satisfaction of the current automatic stop condition is equal to or more than a reference minimum distance and equal to or less than a reference maximum distance. it can.

If it is determined in step S309 that the condition for prohibiting the automatic stop control is satisfied, the CPU 29
Proceeds to S310, prohibits the execution of the automatic stop control of the internal combustion engine 1, and ends the execution of this routine once.

On the other hand, if it is determined in step S309 that the prohibition condition for the automatic stop control is not satisfied,
In step S311, automatic stop control of the internal combustion engine 1 is executed, and the execution of this routine is temporarily ended. In the automatic stop control, the CPU 29 stops the supply of drive power from the drive circuit 15 to the fuel injection valve 13, for example, so-called fuel cut control, and / or the throttle valve 7.
The operation of the internal combustion engine 1 is stopped by controlling the actuator 8 so that

If it is determined in step S306 that the estimated count value: C _Y exceeds the assumed durable use count: C, the CPU 29 determines whether the starter motor 300 has been operated until the estimated durable life of the vehicle has elapsed. It is estimated that it is difficult to maintain the durability, and the process proceeds to S307.

In S307, the CPU 29 executes a process for changing the automatic stop prohibition condition. In this case, the CPU 29
Changes the automatic stop prohibition condition in order to maintain the durability of the starter motor 300 until the expected service life of the vehicle elapses, in other words, to reduce the number of times the starter motor 300 is used until the expected service life of the vehicle elapses. Then, the changed automatic stop prohibition condition is stored in the backup RAM 32 as a new automatic stop prohibition condition.

Here, when the above-mentioned reference minimum distance is set as the automatic stop prohibition condition, the CPU
No. 29 increases the value of the reference minimum distance and substantially reduces the execution area of the automatic stop control.

As a method of changing the reference minimum distance, for example, as shown in FIG. 4, the execution history (automatic stop control execution frequency for each distance) of the automatic stop control up to the present time is collected, and the automatic stop control is executed. The execution frequency of the automatic stop control after the lapse of the assumed service life based on the integrated value of the execution frequency of the stop control, the total running distance from the present time, and the elapsed time from the new vehicle to the present time (that is, the starter motor 3 after the lapse of the assumed service life)
For example, a method of changing the reference minimum distance so that (the number of times of use of 00) is less than or equal to the assumed number of times of use: C can be exemplified.

After reducing the execution area of the automatic stop control by increasing the value of the reference minimum distance, the frequency of use of the starter motor 300 decreases due to a change of the owner of the vehicle or the like. Estimated count value calculated by:
If C _Y is less than the expected service life: C, CP
U29 may reduce the value of the reference minimum distance and enlarge the execution area of the automatic stop control.

The CPU that has completed the processing of S307
In step S308, it is determined whether the automatic stop condition of the internal combustion engine 1 is satisfied. If it is determined in S308 that the automatic stop condition is satisfied, the CPU 2
In step S309, it is determined whether the automatic stop prohibition condition newly set in step S307 is satisfied.

If it is determined in step S309 that the new automatic stop prohibition condition is satisfied, the CPU 29 prohibits execution of the automatic stop control of the internal combustion engine 1 in step S310, and executes the new automatic stop control in step S309. If it is determined that the automatic stop prohibition condition is not satisfied, the program proceeds to S3.
At 11, an automatic stop control of the internal combustion engine 1 is executed.

As described above, when the CPU 29 executes the application program stored in the ROM 30, the automatic stop / start unit, the automatic stop prohibiting unit, and the prohibiting condition changing unit according to the present invention are realized.

Therefore, according to the present embodiment, the prohibition condition of the automatic stop control is appropriately changed according to the use frequency of the starter motor 300. Therefore, when the use frequency of the starter motor 300 is high, the prohibition of the automatic stop control is prohibited. There is no possibility that the engine cannot be started due to insufficient power.

In this embodiment, the starter motor 3
Although the example in which the automatic stop prohibition condition is changed according to the usage frequency of 00 is described, the automatic stop prohibition condition may be changed according to the use time of the starter motor 300, the use time of the battery 500, and the like.

In this embodiment, an example in which the automatic stop prohibition condition is changed so as to reduce the execution area of the automatic stop control only when the starter motor 300 is frequently used has been described. When the use frequency of the motor 300 is low, the automatic stop prohibition condition may be changed so as to enlarge the execution area of the automatic stop control.

[0068]

According to the automatic stop / start apparatus for an internal combustion engine according to the present invention, the automatic stop prohibition condition is changed in accordance with the use history of the elements relating to the start of the internal combustion engine. If the usage frequency and usage time are small and the performance degradation of the elements related to the start is small, the execution area of the automatic stop control is expanded, and the automatic stop control is prohibited when the elements related to the start can start the internal combustion engine. No more.

On the other hand, if the frequency and use time of the elements related to the start of the internal combustion engine are large and the performance of the elements related to the start is greatly reduced, the execution area of the automatic stop control is reduced, and the elements related to the start reduce the internal combustion engine. The execution of the automatic stop control is not permitted when the vehicle cannot be started.

Therefore, according to the automatic stop / start device for an internal combustion engine according to the present invention, it is possible to prohibit the automatic stop control according to the frequency of use of auxiliary equipment related to the automatic start of the power storage device and the starter motor. As a result, the automatic stop control is not unnecessarily prohibited, and the automatic stop control is not executed when the internal combustion engine is in a state where it cannot be started. This makes it possible to prevent the internal combustion engine from being unable to restart.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine to which an automatic stop / start device according to the present invention is applied;

FIG. 2 is a diagram showing an internal configuration of an ECU.

FIG. 3 is a flowchart showing an automatic stop control routine.

FIG. 4 is a diagram for explaining a method of changing an automatic stop prohibition condition.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine 7 ... Throttle valve 10 ... Accelerator pedal 11 ... Accelerator position sensor 20 ... Crank position sensor 21 ... Water temperature sensor 22 ... ECU 29 ... CPU 30, ROM 300, starter motor 400, power generation mechanism 500, battery

Continued on front page F-term (reference) 3G084 BA05 BA13 BA32 DA02 DA09 EB08 FA05 FA10 FA13 FA20 FA26 FA33 FA38 3G093 AA05 BA04 BA19 BA21 BA22 DA05 DA06 DA07 DA11 DA12 DB05 DB11 DB19 EA00 EA05 EA09 EC02 FA10

Claims (1)

[Claims] An automatic stop / start means for automatically stopping the internal combustion engine when an automatic stop condition is satisfied and automatically restarting the internal combustion engine when an automatic start condition is satisfied; Automatic stop prohibition means for prohibiting automatic stop control by the automatic stop / start means when the stop prohibition condition is satisfied, and according to a use history of an element related to the start of the internal combustion engine,
Prohibition condition changing means for changing the automatic stop prohibition condition,
An automatic stop / start device for an internal combustion engine, comprising: