WO2015166819A1

WO2015166819A1 - Internal combustion engine stop control device

Info

Publication number: WO2015166819A1
Application number: PCT/JP2015/061818
Authority: WO
Inventors: 亮湯山
Original assignee: スズキ株式会社
Priority date: 2014-04-28
Filing date: 2015-04-17
Publication date: 2015-11-05
Also published as: JP2015209928A; CN105658492A; CN105658492B; DE112015002030T5; JP6237448B2

Abstract

An internal combustion engine stop control device capable of reducing passenger discomfort related to vibration generated by an internal combustion engine when the internal combustion engine stops. The internal combustion engine stop control device is mounted in a vehicle comprising an engine and an AMT that automatically performs shift and clutch operations. The internal combustion engine stop control device performs a shift operation that switches the gear position to the highest position and a clutch operation that switches an automatic clutch to a transmission state, on the condition that said device has detected that the vehicle speed (V) is less than a prescribed vehicle speed (Vth) and an engine stop instruction has been given.

Description

Internal combustion engine stop control device

The present invention relates to an internal combustion engine stop control device, and more particularly to an internal combustion engine stop control device used for a vehicle equipped with an automatic clutch and an automatic shift type automatic transmission, so-called AMT (Automated Manual Transmission).

It is known that in a vehicle equipped with an engine as an internal combustion engine, vibrations generated by the engine when the engine is stopped are transmitted to the vehicle body and transmitted to passengers as unpleasant vibrations. In particular, when the engine is stopped, such vibrations when the engine is stopped are in a resonance speed range where the vibration frequency based on the engine speed in the low speed range matches the natural frequency of the vehicle drive system and resonates. Becomes prominent.

2. Description of the Related Art Conventionally, as an engine stop control device that suppresses vibrations when the engine is stopped as described above, the one described in Japanese Patent No. 399174 (Patent Document 1) is known. The engine stop control device described in Japanese Patent No. 3991744 controls the lift amount of the intake valve to the minimum value when the engine is stopped, and the throttle valve is fully closed to rapidly reduce the intake air amount. . At this time, fuel injection is stopped.

This will cause the engine output torque to drop sharply. Therefore, it is possible to shorten the time during which the engine speed stays in the above-described resonance speed region when the engine is stopped. As a result, vibration when the engine is stopped is suppressed.

Japanese Patent No. 3991674

However, in the conventional engine stop control device described in Japanese Patent No. 3991744, even when the throttle valve is fully closed when the engine is stopped, the intake passage configured by the intake pipe, the surge tank, the intake manifold, and the like is not provided. Since the already sucked air is sucked into the cylinder of the engine, the pressure in the cylinder (hereinafter referred to as “in-cylinder pressure”) does not drop immediately. Further, the piston in the cylinder in the compression stroke when the engine is stopped may promote the rotation of the crankshaft.

For this reason, in the conventional engine stop control device, even if the throttle valve is fully closed when the engine is stopped, the crankshaft continues to rotate for a predetermined time due to inertia. As a result, the conventional engine stop control device has a problem that vibration is generated from the engine while the crankshaft is rotating by inertia, and the vibration is transmitted to the passenger as unpleasant vibration.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an internal combustion engine stop control device that can reduce occupant discomfort with respect to vibration generated in the internal combustion engine when the internal combustion engine is stopped as compared with a conventional engine stop control device. .

According to a first aspect of the present invention, an internal combustion engine that generates a driving force of a vehicle, and rotation output from the internal combustion engine is shifted at a gear ratio corresponding to any one of a plurality of shift speeds and output to drive wheels. A shift mechanism, a clutch that switches between a transmission state that transmits power between the internal combustion engine and the transmission mechanism, and a cutoff state that blocks transmission of the power, a shift operation to establish the shift stage, and the An internal combustion engine stop control device mounted on a vehicle including a control unit that automatically performs a clutch operation for switching a clutch, wherein a vehicle speed detection unit that detects a vehicle speed, and an instruction to stop the internal combustion engine A stop instruction detecting unit that detects that the vehicle speed is detected, and the control unit detects that the vehicle speed detected by the vehicle speed detecting unit is less than a predetermined vehicle speed, and the stop instruction detecting unit stops the internal combustion engine. The shift operation is performed so as to switch the shift speed to a travel speed, and the clutch operation is performed so as to switch the clutch to the transmission state on condition that the indication is detected. To do.

As a second aspect of the present invention, a brake control unit that controls a brake device that applies a braking force to the driving wheel is provided, and the brake control unit is instructed to stop the internal combustion engine by the stop instruction detection unit. It is preferable that the brake device is controlled so that a braking force is applied to the drive wheel on the condition that the fact is detected.

As a third aspect of the present invention, the control unit is configured such that the vehicle speed detected by the vehicle speed detection unit is less than a predetermined vehicle speed, and the stop instruction detection unit instructs the stop of the internal combustion engine. It is preferable that the shift operation is performed so as to switch the gear to the uppermost gear having the lowest gear ratio, and the clutch operation is performed so that the clutch is switched to the transmission state.

As described above, according to the first aspect described above, on the condition that the vehicle speed is less than the predetermined vehicle speed and it is detected that the stop instruction for the internal combustion engine has been made, the gear position is the gear position for traveling. And the clutch is switched to the transmission state. For this reason, when there is an instruction to stop the internal combustion engine, the drive wheel and the speed change mechanism in which the driving gear stage is established are connected to the internal combustion engine. As a result, a load is suddenly applied to the internal combustion engine.

As a result, the internal combustion engine can be stopped early. Therefore, according to said 1st aspect, a passenger | crew's discomfort with respect to the vibration which generate | occur | produces in an internal combustion engine at the time of an internal combustion engine stop can be reduced compared with the past.

According to the second aspect, the brake device applies a braking force to the drive wheels on the condition that it is detected that the stop instruction for the internal combustion engine has been made, so that the vehicle starts to move when the internal combustion engine stops. Can be prevented.

According to the third aspect, on the condition that the vehicle speed is less than the predetermined vehicle speed and the stop instruction of the internal combustion engine is detected, the gear position is switched to the uppermost gear having the lowest gear ratio. And the clutch is switched to the transmission state. For this reason, when there is an instruction to stop the internal combustion engine, the drive torque transmitted from the internal combustion engine to the drive wheels can be reduced. Accordingly, it is possible to further prevent the vehicle from moving when the internal combustion engine is stopped.

FIG. 1 is a configuration diagram showing a main part of a vehicle equipped with an internal combustion engine stop control device according to an embodiment of the present invention. FIG. 2 is a flowchart showing a flow of engine stop control processing executed by the ECU of the internal combustion engine stop control apparatus according to the embodiment of the present invention. FIG. 3 is a timing chart when the engine is stopped in the vehicle equipped with the internal combustion engine stop control device according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a vehicle 1 equipped with an internal combustion engine stop control device according to an embodiment of the present invention includes an engine 2 as an internal combustion engine, an AMT (Automated Manual Transmission) 3, a brake system 4, and a control. An ECU (Electric Control Unit) 5 and a drive wheel 7 are included. In FIG. 1, only one drive wheel 7 of the pair of drive wheels 7 is illustrated.

The engine 2 is a four-cycle gasoline engine that performs a series of four strokes including an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke, and ignites during the compression stroke and the expansion stroke to generate the driving force of the vehicle 1. It is configured.

The intake manifold 21 is connected to the engine 2. The intake manifold 21 is provided with a surge tank 22 for temporarily storing the sucked fresh air. An intake pipe 23 is connected to the surge tank 22. An air cleaner 24 that cleans fresh air flowing from the outside of the vehicle is provided on the upstream side of the intake pipe 23 in the intake direction.

An intake passage 25 communicating with an intake port (not shown) of the engine 2 is formed inside the intake manifold 21, the surge tank 22, and the intake pipe 23. The intake passage 25 is provided with a throttle valve 26 for adjusting a flow rate of fresh air introduced into a combustion chamber (not shown) of the engine 2, that is, an intake air amount.

The throttle valve 26 is opened and closed by a throttle actuator (not shown). The opening / closing operation of the throttle valve 26 is controlled by the ECU 5 via a throttle actuator.

Also, an exhaust manifold 27 is connected to the engine 2. An exhaust pipe 28 is connected to the exhaust manifold 27. An exhaust passage 29 communicating with an exhaust port (not shown) of the engine 2 is formed inside the exhaust manifold 27 and the exhaust pipe 28.

The exhaust passage 29 is provided with a catalyst 30 for purifying exhaust gas discharged from the engine 2 and passing through the exhaust passage 29. The engine 2 is provided with an engine speed sensor 101 that can detect the engine speed Ne based on a rotation angle of a crankshaft (not shown) of the engine 2.

The AMT 3 includes a speed change mechanism 31 and an automatic clutch 32 as a clutch. The AMT 3 is a transmission capable of automatically performing a shift operation for establishing a gear position in the transmission mechanism 31 and a clutch operation for switching the automatic clutch 32.

The aforementioned shift operation is controlled by the ECU 5 via a shift operation device 31a including, for example, an electromagnetic or hydraulic shift actuator (not shown) and a select actuator. The shift operation device 31a is operable based on a gear control signal transmitted from the ECU 5.

The clutch operation is controlled by the ECU 5 via, for example, an electromagnetic or hydraulic clutch actuator 32a. The clutch actuator 32a is operable based on a clutch control signal transmitted from the ECU 5.

The vehicle 1 according to the present embodiment can set an automatic transmission mode and a manual mode. For example, when the automatic transmission mode is set, the shift operation and the clutch operation described above are based on, for example, the vehicle speed and the accelerator opening. Is done automatically.

When the manual mode is set, the shift operation and the clutch operation described above are performed according to the driver's operation of the shift lever (not shown). The automatic transmission mode and the manual mode can be arbitrarily switched by the driver.

In this embodiment, in addition to the shift operation and clutch operation described above according to the automatic transmission mode and the manual mode, the shift operation and clutch operation in the AMT 3 are automatically performed when the engine 2 is stopped. Details will be described later.

The transmission mechanism 31 is configured in the same manner as a manual transmission, for example, a plurality of constantly meshing gear pairs (not shown) for establishing a plurality of shift speeds, and any of the plurality of gear pairs and an input shaft or output A synchronization device (not shown) that synchronizes with a shaft (not shown) and the shift operation device 31a described above are included.

The speed change mechanism 31 configured as described above shifts the rotation output from the engine 2 at a speed change ratio corresponding to any one of a plurality of shift speeds, and outputs it to each drive wheel 7 via a differential (not shown) or the like. .

Here, as the shift speeds that can be established by the speed change mechanism 31, there are, for example, a shift speed for traveling from the first speed to the fifth speed and a reverse speed. In this case, the fifth gear is the uppermost gear of the driving gear. The number of gears for traveling varies depending on the specifications of the vehicle 1 and is not limited to the first to fifth gears described above.

The automatic clutch 32 is composed of, for example, a friction clutch and includes the clutch actuator 32a described above. The automatic clutch 32 is configured to switch between a transmission state in which power is transmitted between the engine 2 and the speed change mechanism 31 and a cut-off state in which transmission of the power is blocked by a clutch actuator 32a.

The brake system 4 includes a brake device 41 that applies a braking force to each drive wheel 7 and a brake control unit 42 that controls the brake device 41. The brake system 4 according to the present embodiment is configured to be able to execute stability control control such as ABS (AntilocktiBrake System) and ESP (registered trademark: Electronic Stability Program).

The brake device 41 generates a brake pressure according to the depression amount of a driver's brake pedal (not shown) and applies a braking force to each drive wheel 7, while braking from the brake control unit 42 by ABS or ESP. A brake pressure can be automatically generated according to the control signal to apply a braking force to each drive wheel 7.

The configuration for automatically applying the braking force to each drive wheel 7 is not limited to the ABS and ESP functions described above, and other functions such as a traction control system may be used. The brake device 41 may cause the braking force to act on wheels other than the driving wheels 7, for example, driven wheels.

As the brake device 41, for example, a hydraulic pressure having a configuration including a pressurization source, a pressure reducing valve, a pressure increasing valve, and the like that are formed so as to be able to independently introduce brake pressure to a wheel cylinder (not shown) of each driving wheel 7. Type brake unit can be used.

The brake control unit 42 is connected to the ECU 5 and controls the brake device 41 according to various control signals such as a signal indicating that a stop instruction of the engine 2 transmitted from the ECU 5 is detected. For example, the brake control unit 42 controls the brake device 41 to apply a braking force to each drive wheel 7 on the condition that the ECU 5 detects a stop instruction of the engine 2 described later.

The ECU 5 includes a computer unit having a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an input port, and an output port.

The ROM of the ECU 5 stores a program for causing the computer unit to function as the ECU 5 along with various control constants and various maps. That is, when the CPU executes a program stored in the ROM, the computer unit functions as the ECU 5.

Input ports of the ECU 5 include various sensors such as the engine speed sensor 101 described above, a vehicle speed sensor 102 as a vehicle speed detection unit that detects the vehicle speed V that is the speed of the vehicle 1, and an accelerator opening sensor (not shown), as well as an ignition. A switch 103 is connected.

Further, various devices including the shift operation device 31a and the clutch actuator 32a described above and a throttle actuator (not shown) are connected to the output port of the ECU 5. The ECU 5 is connected to a brake control unit 42, which will be described later, so as to be capable of bidirectional communication, and exchange data with each other.

When the ignition switch 103 is turned off by the driver, the ECU 5 detects that an instruction to stop the engine 2 has been issued in response to a key signal indicating the OFF operation input from the ignition switch 103. Yes. That is, the ECU 5 has a function as a stop instruction detection unit 51 that detects that an instruction to stop the engine 2 has been issued.

Further, the ECU 5 changes the gear position to the gear position for traveling on condition that the vehicle speed V detected by the vehicle speed sensor 102 is less than the predetermined vehicle speed Vth and that the stop instruction of the engine 2 has been issued. Among them, the shift operation is automatically performed so as to switch to the uppermost stage (the fifth speed stage in the present embodiment) having the lowest speed ratio.

However, the ECU 5 automatically performs the clutch operation so as to switch the automatic clutch 32 to the disconnected state prior to the above-described shift operation. As a result, the automatic clutch 32 is released, and a shift operation in the transmission mechanism 31 is enabled.

Further, after performing the above-described shift operation, the ECU 5 automatically performs the clutch operation so that the automatic clutch 32 is switched to the transmission state. As a result, the automatic clutch 32 is engaged, and the engine 2 and each drive wheel 7 are directly connected via the AMT 3 in which the uppermost gear stage is established.

At this time, the uppermost stage established by the AMT 3 has a lower speed ratio than the other speed stages, so that the drive torque transmitted from the engine 2 to each drive wheel 7 is minimized. Therefore, even if the automatic clutch 32 described later is engaged, the propulsive force of the vehicle 1 is small, so that the vehicle 1 can be prevented from moving when the engine is stopped.

Next, the flow of the engine stop control process executed by the ECU 5 according to the present embodiment will be described with reference to FIG. This engine stop control is repeatedly executed at predetermined time intervals.

As shown in FIG. 2, first, the ECU 5 determines whether or not a stop instruction for the engine 2 has been detected based on a key signal input from the ignition switch 103 (step S1). When it is determined that the stop instruction for the engine 2 has not been detected, the ECU 5 performs the process of step S1 again.

When it is determined that the stop instruction of the engine 2 has been detected, the ECU 5 determines whether or not the state where the vehicle speed V is less than the predetermined vehicle speed Vth (V <Vth) continues for the predetermined time tv (step S2). ). The predetermined vehicle speed Vth is an extremely low vehicle speed at which the vehicle 1 can be regarded as stopped, for example. The order of step S1 and step S2 may be interchanged.

When the ECU 5 determines that the state where the vehicle speed V is less than the predetermined vehicle speed Vth (V <Vth) does not continue for the predetermined time tv, the ECU 5 performs the process of step S1 again. When the ECU 5 determines that the state where the vehicle speed V is lower than the predetermined vehicle speed Vth (V <Vth) continues for the predetermined time tv, the ECU 5 releases the automatic clutch 32 (step S3). That is, the ECU 5 switches the automatic clutch 32 to the disconnected state.

Next, the ECU 5 applies a braking force to each drive wheel 7 via the brake device 41 and the brake control unit 42 (step S4). Thereafter, the ECU 5 selects the uppermost gear position via the shift operation device 31a (step S5). That is, the ECU 5 controls the shift operation device 31a so that the fifth speed is established as the gear position in the AMT 3.

Next, the ECU 5 stops fuel injection in the engine 2 (step S6). Thereafter, the ECU 5 engages the automatic clutch 32 (step S7). That is, the ECU 5 switches the automatic clutch 32 to the transmission state.

Thereafter, the ECU 5 determines whether or not the state where the engine rotational speed Ne is less than the predetermined rotational speed Nth continues for the predetermined time tn (step S8). The predetermined rotational speed Nth is an extremely low engine speed that can be regarded as the operation of the engine 2 being stopped.

ECU5 performs the process of step S7 again, when it determines with the state whose engine speed Ne is less than the predetermined rotation speed Nth not continuing only for the predetermined time tn. On the other hand, if the ECU 5 determines that the state where the engine speed Ne is less than the predetermined speed Nth continues for the predetermined time tn, the ECU 5 controls the AMT 3 to the neutral state via the shift operation device 31a (step S9). .

Specifically, the ECU 5 operates the shift operation device so that the transmission mechanism 31 is in a neutral state in which no gear stage is established, that is, a neutral state in which none of the plurality of gear pairs is synchronized with the input shaft or the output shaft. 31a is controlled.

Next, the ECU 5 stops the action of the braking force by the brake device 41 (step S10) and ends the engine stop control. That is, the ECU 5 controls the brake control unit 42 so as to release the braking force applied to each drive wheel 7 in step S4, and ends the engine stop control.

Next, the operation of the internal combustion engine stop control device according to the present embodiment will be described with reference to FIG. The timing chart shown in FIG. 3 shows the process when the engine is stopped.

As shown in FIG. 3, when the vehicle 1 decelerates and the vehicle speed V becomes lower than the predetermined vehicle speed Vth, measurement of an internal timer of the ECU 5, for example, is started in order to measure the predetermined time tv. Thereafter, when the state in which the vehicle speed V is less than the predetermined vehicle speed Vth has elapsed for a predetermined time tv, it is determined that the vehicle 1 has stopped reliably, and the vibration stop signal is switched from OFF to ON.

Whether or not the vibration stop signal permits automatic shift operation and clutch operation for suppressing vibration when the engine is stopped regardless of the driver's request or the like when there is an instruction to stop the engine 2 It is a signal which shows. When the vibration stop signal is turned ON, it is permitted to automatically perform a shift operation and a clutch operation for suppressing vibration when the engine is stopped.

When the key signal is switched from ON to OFF after the vibration stop signal is switched ON, the clutch control signal is switched from OFF to ON, and the automatic clutch 32 is released. Next, the brake control signal is switched from OFF to ON, and a braking force is applied to each drive wheel 7.

Thereafter, the gear control signal is switched from OFF to ON while the automatic clutch 32 is disengaged and the braking force is applied to each drive wheel 7. As a result, the uppermost gear is established as the gear position in the AMT 3 by the shift operating device 31a.

Subsequently, fuel injection in the engine 2 is stopped, and the injection amount becomes “0”. Thereafter, the clutch control signal is switched from ON to OFF, and the automatic clutch 32 is engaged. Thus, the engine 2 and each drive wheel 7 are directly connected via the AMT 3 in a state where a braking force is applied to each drive wheel 7.

For this reason, the load on the engine 2 increases rapidly, and the engine speed Ne decreases rapidly. The torque fluctuation of the engine 2 generated at this time is transmitted to the rubber tire portion of each drive wheel 7 and is absorbed by the vibration damping function of the rubber tire portion. Further, since the engine speed Ne is rapidly decreased, the engine 2 is stopped early. As a result, the time during which the vibration based on the torque fluctuation of the engine 2 and the natural frequency of the vehicle drive system coincide and resonate is also shortened compared to the conventional case.

Thereafter, when the engine rotational speed Ne becomes less than the predetermined rotational speed Nth, for example, measurement of an internal timer of the ECU 5 is started in order to measure the predetermined time tn. After that, when the state in which the engine speed Ne is less than the predetermined speed Nth has elapsed for a predetermined time tn, it is determined that the engine 2 has stopped reliably.

Thereby, the gear control signal is switched from ON to OFF, and the AMT 3 is controlled to the neutral state by the shift operation device 31a. Thereafter, the brake control signal is switched from ON to OFF, and the braking force applied to each drive wheel 7 is released.

As described above, the internal combustion engine stop control apparatus according to the present embodiment is based on the condition that the vehicle speed V is less than the predetermined vehicle speed Vth and that the stop instruction of the engine 2 is detected. Is switched to the uppermost stage having the lowest gear ratio, and the automatic clutch 32 is switched to the transmission state.

For this reason, when there is an instruction to stop the engine 2, each drive wheel 7 and the AMT 3 in which the uppermost stage is established and the engine 2 are directly connected. As a result, a load is suddenly applied to the engine 2. As a result, the engine 2 can be stopped early. Therefore, the internal combustion engine stop control device according to the present embodiment can reduce the occupant's discomfort with respect to the vibration generated in the engine 2 when the engine is stopped, as compared with the conventional system.

Further, in the internal combustion engine stop control device according to the present embodiment, the brake device 41 applies a braking force to each drive wheel 7 on the condition that it is detected that the stop instruction of the engine 2 has been made. Sometimes, the vehicle 1 can be prevented from moving.

In the present embodiment, a gasoline engine is used as the engine 2. However, the present invention is not limited to this, and a diesel engine may be used as the engine 2. In this case, the throttle valve 26 is not equipped. In the case of a diesel engine, the throttle valve is fully closed when the engine is stopped and the intake air amount cannot be rapidly reduced as in the conventional case, which can reduce passenger discomfort due to vibration when the engine is stopped. Can not. In the present embodiment, even when such a diesel engine is used, passenger discomfort with respect to vibration when the engine is stopped can be reduced regardless of the presence or absence of the throttle valve.

In the present embodiment, the engine 2 is instructed to be stopped when the ignition switch 103 is turned off. However, the present invention is not limited to this. For example, when the vehicle 1 is a vehicle having an idle stop function. The engine 2 may be instructed to stop when the automatic engine stop condition is satisfied.

In the present embodiment, the gear stage established by AMT3 in the engine stop control described above is the uppermost stage. However, the present invention is not limited to this, and a gear stage for traveling lower than the uppermost stage is established. Also good. However, when a gear other than the uppermost gear is used, it is preferable that the gear is close to the uppermost gear (fourth gear or third gear in this embodiment).

Although the embodiments of the present invention have been disclosed as described above, it is obvious that those skilled in the art can make changes without departing from the scope of the present invention. All such modifications and equivalents are intended to be included in the following claims.

1 vehicle 2 engine (internal combustion engine)
3 AMT
4 Brake system 5 ECU (control unit, stop instruction detection unit)
7 Drive Wheel 31 Transmission Mechanism 31a Shift Operation Device 32 Automatic Clutch
32a Clutch actuator 41 Brake device 42 Brake control unit 101 Engine speed sensor 102 Vehicle speed sensor (vehicle speed detection unit)
103 Ignition switch

Claims

An internal combustion engine that generates a driving force of a vehicle, a speed change mechanism that changes the rotation output from the internal combustion engine at a speed ratio corresponding to any one of a plurality of shift speeds, and outputs the speed to drive wheels; the internal combustion engine; A clutch that switches between a transmission state that transmits power to and from a speed change mechanism and a cut-off state that blocks transmission of the power, a shift operation that establishes the shift speed, and a clutch operation that switches the clutch An internal combustion engine stop control device mounted on a vehicle including a control unit that automatically performs
A vehicle speed detector for detecting the vehicle speed;
A stop instruction detection unit that detects that an instruction to stop the internal combustion engine has been made,
The control unit is configured on the condition that the vehicle speed detected by the vehicle speed detection unit is less than a predetermined vehicle speed, and that the stop instruction detection unit detects that the internal combustion engine is instructed to stop. An internal combustion engine stop control device, wherein the shift operation is performed so as to switch the gear position to a travel gear position, and the clutch operation is performed so that the clutch is switched to the transmission state.
A brake control unit that controls a brake device that applies a braking force to the drive wheel;
The brake control unit controls the brake device to apply a braking force to the driving wheel on condition that the stop instruction detecting unit detects that the stop instruction of the internal combustion engine has been made. The internal combustion engine stop control device according to claim 1.
The control unit is configured on the condition that the vehicle speed detected by the vehicle speed detection unit is less than a predetermined vehicle speed, and that the stop instruction detection unit detects that the internal combustion engine is instructed to stop. 3. The internal combustion engine according to claim 1, wherein the shift operation is performed so as to switch a gear position to the uppermost gear having the lowest gear ratio, and the clutch operation is performed so that the clutch is switched to the transmission state. Engine stop control device.