JP2001355481A - Engine stop control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a driver from feeling a sense of incongruity and shock when starting. SOLUTION: This engine stop control device for temporarily stopping an engine in the stop state of a vehicle during driving of the vehicle, detects the operating state of a brake and restarts the engine from the stop state in the case a foot brake is released. A smooth start can be made with accelerator operation by restarting the engine before the accelerator operation. Further, the storage capacity of a battery means mounted on the vehicle is detected, and the engine is restarted in the case the storage capacity exceeds a specified value in the state of the engine being stopped and the brake being operated. The vehicle is a hybrid automobile starting the engine by the torque of a motor- generator, for instance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine stop control device, and more particularly to an engine stop control device for temporarily stopping an engine when a vehicle is stopped.

[0002]

2. Description of the Related Art Conventionally, as a technique for improving the fuel efficiency of an automobile in response to a demand for resource saving, a device for performing engine stop control during driving has been proposed. The engine stop control device is a device that temporarily stops the engine in a stopped state during driving of the vehicle as described below.

[0003] While a vehicle is running, the vehicle may be frequently stopped at a red light at an intersection or in a congested road. By stopping the engine while the vehicle is stopped, fuel consumed by idling the engine can be saved. Focusing on this point, the engine stop control device temporarily stops the engine when the vehicle is stopped during driving and restarts the engine when driving resumes, thereby improving the fuel efficiency of the automobile. is there.

FIGS. 1 and 2 of JP-A-4-246252 describe the configuration of a conventional engine stop control device. The conventional device is configured to detect information such as a vehicle speed and an accelerator ON operation, and to output a control signal for temporarily stopping an engine during a stop based on the information. Specifically, when the vehicle speed is zero, the accelerator is off, and the electric equipment mounted on the vehicle is not energized, the engine stop condition is satisfied, and a control signal for stopping the engine is output. Output. When the transmission is in the low gear state, the clutch is engaged, and the accelerator is turned on (that is, the accelerator pedal is depressed), the condition for restarting the engine is satisfied, and the condition for restarting the engine is satisfied. Outputs control signal.

As described above, in the conventional engine stop control device, the ON operation of the accelerator is set as a condition for restarting the engine. In other words, the conventional device focuses on operating the accelerator pedal when the driver resumes running, and is configured to restart the engine with an accelerator ON operation as a signal to restart running.

[0006]

As described above, all of the conventional engine stop control devices are configured to restart the engine on condition that the accelerator is turned on. However, such a configuration has the following problems.

In the conventional apparatus, a control signal for restarting the engine is output by turning on the accelerator, the engine is cranked, the engine is started, and then the vehicle starts. That is, from the accelerator ON operation,
The vehicle starts after a time lag for the engine to actually start. Since the driver further depresses the accelerator pedal during this time lag, the vehicle starts faster than when the engine is not temporarily stopped. Due to the time lag until the start and the rapid start as described above, a smooth start is not performed, and the driver may feel uncomfortable and shock.

Further, when a conventional device is provided in a vehicle equipped with a hydraulically controlled transmission such as a general automatic transmission or a continuously variable transmission (CVT), the following problem may further occur. Generally, such a vehicle is configured to generate a control oil pressure for a transmission by driving oil pressure generation means by an engine output. Here, when the engine stop control device is operated, the control hydraulic pressure is reduced together with the temporary stop of the engine, and the control hydraulic pressure is generated and restarted in response to the engine restart. Therefore, when the conventional device is provided, the O
Normal control of the transmission is started after a time lag from the N operation until the control oil pressure rises. For this reason, the transmission may operate before the hydraulic pressure rises to perform appropriate shift control, or the operation of the transmission and the start of the vehicle may occur simultaneously to cause a shock to the driver. From the above, the sense of discomfort and shock experienced by the driver further increase.

As described above, the conventional engine stop control apparatus has a time lag from when the accelerator is turned on to when the engine is actually started because the operation for turning on the accelerator is a condition for restarting the engine. As a result, there is a problem that the driver is discomforted and shocked.

[0010] An object of the present invention is to solve the above-mentioned problems, and when the engine is restarted and the vehicle starts, the start is smoothly performed together with the operation of the accelerator, and the driver feels uncomfortable feeling and shock caused by the time lag. The present invention is to provide an engine stop control device which does not give to the engine.

[0011]

SUMMARY OF THE INVENTION The present invention relates to an engine stop control device for temporarily stopping an engine in a stopped state during driving of a vehicle.
When the brake is released, the engine is restarted from a stopped state. More preferably, the operation state by the stepping operation of the foot brake is detected, an engine start command is issued immediately when the release of the foot brake is detected, and the period from the release of the foot brake to the operation of the accelerator is performed. By starting the engine speed, the engine is restarted from an engine stop state while the vehicle is stopped.

According to the above configuration, when the vehicle resumes running, the engine is restarted by releasing the brake. In particular, in the case of the foot brake operation, an instruction to restart the engine is issued immediately after the release of the foot brake, and the engine speed is raised during the period from the release of the foot brake to the operation of the accelerator. Here, since the driver generally turns on the accelerator immediately after releasing the brake, the engine stop control device having the above-described configuration includes:
The fuel efficiency is substantially the same as that of a conventional device that restarts the engine on condition that the accelerator is turned on. And
Since the engine is started prior to the accelerator ON operation, the vehicle starts smoothly with the accelerator operation. Further, when a hydraulically controlled transmission is mounted, the control hydraulic pressure is raised before the accelerator is turned on, and normal transmission control is performed when the accelerator is operated.

Further, according to the present invention, when the foot brake is in the ON state, and a predetermined time set to a time length for which it is determined that the vehicle does not stop and run at short intervals has elapsed since the vehicle stopped. Sometimes, the engine can be stopped automatically.

According to the present invention, the engine does not stop in a situation where the vehicle runs and stops little by little, such as when entering a garage, so that in such a situation, the engine is repeatedly stopped to worsen the fuel efficiency. Can be avoided.

Further, the present invention further detects the amount of power stored in the power storage means mounted on the vehicle, and when the amount of stored power falls below a predetermined value in a state where the engine is stopped and the brake is operating. The engine can be restarted immediately. According to this configuration, it is possible to prevent the life of the power storage unit from being shortened due to a decrease in the amount of stored power while the engine stop control device is operating and the engine is temporarily stopped, and it is possible to prevent the engine from being unable to restart. You.

The vehicle provided with the engine stop control device of the present invention is, for example, a hybrid vehicle in which an engine is started by the rotational force of a motor generator.
The above-mentioned hybrid vehicle has less noise and shock when starting the engine, and is suitable for providing the engine stop control device of the present invention.

[0017]

Embodiment 1 Embodiment 1 is an embodiment in which the engine stop control device of the present invention is applied to a hybrid vehicle. FIG. 1 is an explanatory diagram showing the engine stop control device of the present embodiment together with the configuration of a hybrid car system.

In the hybrid car system, the engine 1 and the motor generator 3 are connected to each other, and the clutch 5, the transmission 7, the differential gear unit 9 and the wheels 11 are sequentially connected to the motor generator 3 via a suitable rotating shaft. The connection is provided. The above components are provided so as to transmit torque to each other. A battery 15 as a power storage means is connected to the motor generator 3 via an inverter 13 provided as a power converter.

The engine 1 generates an engine output. The engine output drives the motor generator 3 as a generator, and transmits the engine output to the wheels 11 to run the vehicle.

The motor generator 3 is a rotating machine that functions as a generator or a motor, and its rotor is directly connected to the crankshaft of the engine 1. When functioning as a generator, the motor generator 3 is driven by the engine output to generate electric power as described above, and also regenerates braking energy during regenerative braking.
Is stored. When functioning as a motor, the battery 1
The wheel 11 is rotated by the supply of electric power from the motor 5, and the wheel 11 is driven by the torque to drive the vehicle. Further, the motor generator 3 performs cranking of the engine 1 by functioning as a motor when starting the engine. The inverter 13 is a power converter that converts an AC current generated by the motor generator 3 into a DC current by switching a switching element, and converts a DC current from the battery 15 into an AC current for driving the motor. is there. Further, a voltage sensor is attached to the battery 15, and a voltage value detected by the voltage sensor is output to a controller 17 described later.

The transmission 7 is a continuously variable transmission (CVT), and the transmission 7 and the clutch 5 are hydraulically controlled. The hydraulic pressure generated by the same hydraulic pressure generating means (not shown) is used as the control hydraulic pressure for both the components, and the hydraulic pressure generating means is driven by the output of the engine.

The above is the configuration of the hybrid car system provided with the engine stop control device of the present embodiment. Next, the engine stop control device of the present embodiment will be described.

This engine stop control device has a controller 17 shown in FIG. 1, to which the vehicle speed, the operation state of the brake, and the voltage value of the battery 15 are inputted. The controller 17 is configured so that the elapsed time from when the vehicle speed becomes zero and the vehicle stops is known. The controller 17 is configured to output control signals to the engine 1, the inverter 13, the clutch 5, and the transmission 7. The controller 17 includes an electronic control unit (E) for controlling each component of the vehicle.
CU) can be configured using the same microcomputer as that used for the CU). Hereinafter, controller 1
7 will be described.

The controller 17 determines whether the following conditions (A) to (C) are satisfied based on the input information. If all the conditions are satisfied, the controller 17 determines that the engine stop condition is satisfied. As will be described later, a signal for controlling the stop of the engine 1 is output to each component to be controlled.

The conditions for stopping the engine 1 are as follows: (A) "A predetermined time has elapsed since the vehicle was stopped and the engine can be stopped" (B) "Brake is ON" (C) "Battery 15 The SOC value is a predetermined value a% or more. " Hereinafter, these conditions will be further described.

The satisfaction of the condition (A) is determined based on the vehicle speed information that a predetermined time has elapsed since the vehicle speed became zero. The reason for providing the condition (A) will be described. In a situation in which running and stopping are repeated little by little, such as when entering a garage, even if the engine is stopped every time the vehicle is stopped, the effect of improving fuel efficiency is hardly obtained, and conversely, a problem such as deterioration of fuel efficiency may occur. Here, by providing the condition (A), the operation of the present control device in the above-described situation can be suppressed. As described above, the predetermined time in the condition (A) is set to a time at which it is determined that the vehicle is not stopping and running at short intervals.

The condition (B) is determined based on information indicating the operation state of the brake. The reason for providing the condition (B) is that the condition of the engine restart is that the brake is released when the engine is restarted, which will be described later, and that the brake must be ON as a precondition. In addition, since the brake is generally in the ON state by the driver's operation while the vehicle is stopped, the condition (B) is suitable as a condition for stopping the engine.

In the condition (C), the "SOC value"
This is a numerical value representing the amount of power stored in the power storage means. In the present embodiment, the ratio of the amount of stored power to the capacity of the power storage means is a percentage (%).
Expressed by The SOC value is calculated based on a detection value of an appropriate state quantity set according to the type of the power storage unit. In the present embodiment, as described above, the battery voltage is detected as the state quantity, taken into the engine stop control device, and the SOC value is obtained from the battery voltage. As the state quantity for obtaining the SOC value, another state quantity indicating the charged amount may be used, and for example, both the current, the battery voltage and the current, the specific gravity of the electrolyte, and the like can be used.

The determination that the condition (C) is satisfied is made by comparing the SOC value obtained above with a predetermined value a%. The predetermined value a% is set to a value at which a sufficient amount of stored battery power is secured if the engine 1 is stopped when the SOC value is equal to or higher than this a%. This sufficient amount of battery charge is a charge amount that does not shorten the battery life if the charged amount is secured and that can supply a required voltage at the time of engine restart. As described above, by providing the condition (A),
When the charged amount of the battery 15 is insufficient, the engine is stopped to prevent the battery life from being shortened and the engine from being unable to be restarted. The SOC predetermined value a% may be set to a value having a margin in consideration of the power consumption of each electric device after the engine is stopped. Further, the SOC predetermined value a% may be variably set each time the control device is operated or the condition (C) is determined. That is, for example, the power consumption during the stop of the engine is predicted based on the operation state of each electric device, and the SOC predetermined value a% is set to a value that does not cause a decrease in battery life even if the predicted power value is consumed. May be configured.

As described above, when all of the above conditions (A) to (C) are satisfied, the controller 17 outputs a signal for controlling the stop of the engine 1 to each component. Specifically, the engine 1 is stopped by, for example, igniting the engine 1 or stopping the fuel supply.
3, the clutch 5 is disengaged, the transmission 7 is shifted to the high side, and other signals for preparing the engine for restart are output to the respective components.

After outputting the control signal for stopping the engine, the controller 17 determines whether or not the following conditions (D) and (E) are satisfied based on the input information described above. If any of the conditions (E) is satisfied, it is determined that the engine restart condition has been satisfied, and a control signal for restarting the engine 1 is output to each component to be controlled, as described later. It is configured as follows.

The conditions for restarting the engine are (D) “the brake is released” and (E) “the SOC value of the battery 15 falls below a predetermined value a%”. Hereinafter, these conditions will be further described.

The provision of the condition (D) is one feature of the present invention. The determination that the condition (D) is satisfied is made based on information indicating the brake operating state (ON / OFF).
This is performed by determining that the brake is released (ON → OFF) based on the detection of the brake OFF. Since the driver operates the accelerator immediately after the release of the brake to restart the running of the vehicle, the release of the brake can be regarded as a signal to start the vehicle. Therefore, by setting the release of the brake as the engine restart condition, a sufficient fuel efficiency improvement effect equivalent to that of the conventional control device that requires the accelerator operation can be obtained. Also, by restarting the engine by releasing the brake, as will be described later, the effect of the present invention is that the engine can be restarted before the accelerator operation and the vehicle can be started smoothly with the accelerator operation. can get.

The condition (E) is another feature of the present invention, and is determined based on the detected voltage value of the battery 15 as in the above condition (C). By providing this condition, as described below, a reduction in the battery life is prevented, and a situation in which the engine cannot be restarted is avoided. While the engine stop control device of the present invention is operating and the engine 1 is stopped, the motor generator 3 is also stopped, and the battery 15 performs discharge for driving each electric device such as a headlight. If the amount of charge stored in the battery 15 is excessively reduced due to this discharge, the battery life may be shortened or the engine may not be restarted.
Here, an appropriate SOC predetermined value is determined, and this predetermined value is set to SOC
When the value falls below, the engine is restarted, and the motor generator 3 is driven by the engine output to generate power, thereby preventing a reduction in battery life and the like. In the present embodiment, the SOC predetermined value is set to a%, which is the same as the condition (C) described above, but may be set to a value different from the condition (C) as appropriate.

In a vehicle provided with an engine stop control device, if a device such as an air conditioner that is required to be continuously used while stopped is an engine driven type, the above device cannot be used continuously due to the stop of the engine while stopped. Would. Therefore, it is preferable that such a device be an electric type that can be used continuously even when the engine is stopped. In such a configuration, the amount of discharge from the battery 15 while the engine is stopped further increases. Therefore, the condition (E) is provided to monitor the charged amount of the battery 15 and prevent the battery life from shortening. It is especially beneficial.

As described above, the controller 17 outputs a signal for restarting the engine 1 to each component when any of the above conditions (D) and (E) is satisfied. Specifically, a control signal is output to the inverter 13 so that the engine 1 is cranked by the motor function of the motor generator 3, and a control signal is output so that the engine 1 performs ignition and fuel supply. In addition, it outputs a control signal to the clutch 5 and the transmission 7.
The control signal output for restarting the engine is:
In a known hybrid vehicle, the same signal as that output from the electronic control unit (ECU) to each component when the engine is started at the start of driving may be used.

FIG. 2 is a flowchart showing the operation of the engine stop control device of the present embodiment. Control using the above-described conditions (A) to (E) is performed according to this flowchart. When the vehicle speed becomes zero and the vehicle stops, the engine stop control device starts. Then, it is determined whether or not the engine can be stopped after a predetermined time has elapsed from the stop (condition (A)) (S1). If the engine cannot be stopped, the determination in step S1 is continued. If the engine can be stopped, the process proceeds to step S2 to determine the ON / OFF state of the brake (condition (B)). Step S if brake is off
Returning to the judgment of step 1, if the brake is ON, step S3
Then, it is determined whether or not the SOC value of the battery 15 is a% or more (condition (C)). If the SOC value is less than a%, the process returns to step S1. If the SOC value is more than a%, a control signal for stopping the engine is sent to the engine 1, the motor generator 3, the clutch 5, and the transmission 7 in step S4. Is output and the engine is stopped.

After the engine is stopped, brake ON / OF
The F state is detected and determined (S5, condition (D)). If the brake is ON, the process proceeds to step S6 where the SOC value is a%.
It is determined whether or not the above is the case (condition (E)). If it is a% or more, the engine stop state is continued. If the SOC value is lower than a%, the process proceeds to step S7, where a control signal for starting the engine is output to each component to start the engine. If the brake OFF is detected in step S5, it is determined that the brake is released, and the process proceeds to step S7 to start the engine in the same manner as described above.

FIG. 3 shows the operation of each component of the hybrid car system under the control of the engine stop control device.
It is explanatory drawing which shows a horizontal axis | shaft typically and makes a time axis | shaft. The figure shows a process from the time when the vehicle is decelerated to a stop, the control device starts control, the driver releases the brake, the engine is restarted, and the vehicle is restarted.
The figure shows, from the top, vehicle speed, accelerator ON / OFF, brake ON / OFF, engine 1 operation / stop, control oil pressure ON / OFF of clutch 5 and transmission 7 (control oil pressure ON means oil pressure rise Indicates a state in which normal hydraulic control is possible.). Hereinafter, the effects of the present invention achieved by the present control device will be described with reference to FIG.

When the vehicle is stopped, the accelerator is turned from ON to OFF (A in the figure), and the brake is turned on after a certain operation time from when the driver moves his foot from the accelerator pedal to the brake pedal to turn on the brake. (B in the figure). The vehicle speed is reduced by turning off the accelerator and turning on the brake,
The vehicle stops at zero speed (C in the figure). Fig. 2 by stopping
Control of the present control device according to the flowchart of
After a lapse of a predetermined time (predetermined time described for S1 in FIG. 2) from the stop, the engine 1 stops according to the output signal of the controller 17 (D in the figure). When the engine is stopped, the control hydraulic pressure of the clutch 5 and the transmission 7 generated by the engine output is also reduced.

When the brake is released after the engine is stopped, the control device detects the release of the brake and outputs a control signal for restarting the engine (E in the figure). Then, the engine 1 starts after cranking by the motor generator 3 (F in the figure). It should be noted that the dotted line attached to the engine start portion in the figure indicates a state during the start of the engine and before the start is completed. In response to the start of the engine, the hydraulic pressure generating means for generating the control hydraulic pressure for the clutch 5 and the transmission 7 is driven, and the control hydraulic pressure is generated and rises (G in the figure). The dotted line attached to the control hydraulic pressure state indicates the state immediately after the start of the driving of the hydraulic control means and before the hydraulic pressure rises, and normal control of the clutch 5 and the like is performed after the hydraulic pressure rises (G in the figure). On the other hand, at a certain operation time after the brake is released, the accelerator is turned ON by the driver to start the vehicle (H in the figure).

In FIG. 3, when the engine is stopped during the period from B to C, the amount of fuel consumed in the idling operation when the engine is continuously operated during this period is saved.

Further, when the accelerator is turned on in H in the figure, the start of the engine 1 is completed (F in the figure), the control oil pressure of the clutch 5 and the like rises, and normal oil pressure control is performed (FIG. Medium G). Therefore, with the accelerator on,
Each component of the hybrid car system such as the engine 1 and the transmission 7 operates promptly, and a smooth start similar to the case where the engine stop control is not performed is performed.

As described above, according to the present embodiment, after the engine is stopped by operating the engine stop control device, the engine is restarted on condition that the brake is released, so that the engine is started prior to the operation of the accelerator and the clutch and the transmission are changed. Control hydraulic pressure is generated. Therefore, it is possible to avoid the occurrence of discomfort and shock due to the time lag from the accelerator operation to the completion of engine start in the above-described conventional device. Further, when the charged amount of the battery falls below a predetermined value, the engine cannot be stopped. When the charged amount falls below the predetermined value after the engine is stopped, the engine is restarted. This prevents the battery life from being shortened due to the provision of the device, and prevents the engine from being unable to be restarted.

When the engine stop control device of the present invention is provided in the hybrid vehicle as described in the first embodiment, the present invention works suitably for the following reasons. In a vehicle provided with the present control device, the engine is stopped / restarted many times during driving. Here, in the above-mentioned hybrid car system, the rotor of the motor generator 3 is directly connected to the crankshaft of the engine 1, and the cranking at the time of starting the engine is performed by the rotational force of the motor generator 3. Low noise and shock. Therefore, it is unlikely to cause a drop in merchantability due to noise or shock when the engine is restarted, or to cause wear and breakage of the cranking mechanism. As described above, the present invention works suitably for the hybrid vehicle of the present embodiment.

In addition, the engine stop control device of the present embodiment may be integrally formed with an electronic control unit (ECU) for controlling each component of the hybrid car system. In this case, it is possible to detect information input to the ECU and output a control signal from the output means of the ECU to each component to be controlled.

The engine stop conditions and restart conditions described in the present embodiment can be changed within the scope of the present invention. For example, a condition that the engine cannot be stopped when the transmission is in the reverse state may be added to the engine stop condition. In this case, other necessary information is input to the controller 17 in accordance with the addition of a condition or the like.

In the present embodiment, the battery 15 is provided as the power storage means of the hybrid car system. However, the control device of the present invention can be similarly applied when a capacitor is provided, for example. In this case, the voltage can be detected as the amount of charge stored in the capacitor, and the SOC value can be obtained from the voltage. Further, the transmission 7 of the present embodiment is a hydraulically controlled C
Although the VT is used, an automatic or manual transmission other than the CVT may be applied, and the present invention can be similarly applied to a case where a transmission that is not a hydraulic control type is used.

[Embodiment 2] Embodiment 2 is an example in which the engine stop control device of the present invention is applied to a conventional automobile running with engine output. The engine stop control device of the present invention can be similarly applied to such a conventional automobile.

FIG. 4 is an explanatory diagram showing a configuration of an automobile to which the engine stop control device of the present embodiment is applied. As shown in the figure, the engine 21, the clutch 23, the transmission 25,
The differential gear device 27 and the wheels 29 are sequentially connected.
The engine stop control device has a controller 31, which is provided so as to control the engine 21, the clutch 23 and the transmission 25 based on input information.

A starter motor 33 is provided adjacent to the engine 21. The starter motor 33 is configured to transmit torque to the engine 21 via a gear mechanism when the engine is started, and perform cranking.

The starter motor 33 is connected to a battery 37 via a switch 35. The battery 37 is also configured to supply current to other accessories. The switch 35 is a key switch and the controller 31
Is connected to It is closed by input of a signal from either the key switch or the controller 31,
The starter 33 and the battery 37 are electrically connected.

The vehicle speed, the operation state of the brake, and the voltage value of the battery 37 are input to the controller 31 as in the first embodiment. Then, similarly to the first embodiment, the aforementioned (A)
When all of the conditions (C) to (C) are satisfied, a control signal for stopping the engine is output to each component.

Further, based on the above input signal, the controller 31 determines the conditions (D) and (E) described in the first embodiment.
Is established, a control signal for restarting the engine 21 is output to each component. That is, a switch closing signal is output to the switch 35, and a control signal for ignition, fuel supply, and the like is output to the engine 21. And switch 35
Is closed, the starter motor 33 is driven by the supply current from the battery 37, and the engine 21 is cranked by the starter motor 33 and started.

The configuration of the engine stop control device according to the present embodiment has been described above. The operation, operation, and effect of the engine stop control device of the present embodiment are the same as those of the first embodiment described above with reference to FIGS.

[0056]

According to the engine stop control device of the present invention, an instruction to restart the engine is issued immediately after the release of the foot brake, and the engine speed is reduced during the period from the release of the foot brake to the operation of the accelerator. Since the engine is started, the engine is restarted before the accelerator is turned ON. Therefore, it is possible to smoothly start the vehicle with the accelerator ON without giving the driver a sense of incongruity or a shock due to a time lag for starting the engine unlike the conventional device.

Further, according to the present invention, the engine is stopped when a predetermined time has elapsed from the stop of the vehicle. Therefore, the engine does not stop in a situation where running and stopping are performed little by little, such as when entering a garage. In such a situation, it can be avoided that the engine is stopped repeatedly to deteriorate the fuel efficiency.

Further, according to the present invention, the amount of power stored in the power storage means is detected, and the engine is restarted when the amount of stored power falls below a predetermined value. It is possible to prevent the life of the power storage unit from being shortened and to prevent the engine from being unable to restart.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a configuration of a hybrid automatic vehicle provided with an engine stop control device according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating a control operation of the engine stop control device according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram schematically showing the operation of each component of the hybrid car system under the control of the engine stop control device according to the first embodiment of the present invention, with the horizontal axis representing the time axis.

FIG. 4 is an explanatory diagram showing a configuration of an automobile provided with an engine stop control device according to a second embodiment of the present invention.

[Explanation of symbols]

1 engine, 3 motor generator, 5 clutch,
7 transmission, 13 inverter, 15 battery, 17
controller.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI theme coat ゛ (Reference) F02N 11/04 B60K 9/00 ZHVC F-term (Reference) 3G092 AA00 AC03 CA01 EB09 FA04 FA32 GA01 HF01Z HF02Z HF05Z HF08Z HF11Z HF15Z HF19X HF21Z HF25Z 3G093 AA01 AA04 AA07 BA03 BA19 BA21 BA22 BA28 CA02 CA08 CB05 DA06 DB05 DB15 DB19 DB23 EB03 EB08 EC02

Claims (4)

[Claims] 1. An engine stop control device for temporarily stopping an engine in a stopped state during driving of a vehicle, wherein the engine stop control device detects an operation state due to a stepping operation of a foot brake,
An engine start command is immediately issued when the release of the foot brake is detected, and the engine speed is increased during a period from the release of the foot brake to the time when the accelerator operation is performed, whereby the engine while the vehicle is stopped is stopped. An engine stop control device for restarting an engine from a stop state. 2. The engine stop control device according to claim 1, wherein the length of time during which the foot brake is on and it is determined that the vehicle does not stop and run shortly after the vehicle stops. An engine stop control device for automatically stopping an engine when a predetermined time set in (1) has elapsed. 3. The engine stop control device according to claim 1, further comprising detecting an amount of power stored in a power storage unit mounted on the vehicle,
An engine stop control device, wherein the engine is restarted when the amount of stored power falls below a predetermined value in a state where the engine is stopped and a brake is operating. 4. The engine stop control device according to claim 1, wherein the vehicle is a hybrid vehicle whose engine is started by the rotational force of a motor generator.