JP3890817B2 - Control device for hybrid vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control apparatus for a hybrid vehicle, and more particularly to an improvement in technology for reducing fuel consumption and exhaust gas by stopping the operation of an engine when an accelerator is OFF.
[0002]
[Prior art]
A hybrid vehicle that includes an engine and an electric motor as a driving source for traveling is known. In such a hybrid vehicle, for example, Japanese Patent Application Laid-Open No. 9-154205 discloses that fuel consumption and exhaust gas are reduced by stopping fuel supply to the engine at the time of a brake operation while the vehicle is running. Yes. Further, there is described a technique for restarting the engine when the accelerator is depressed (accelerator ON) or when the brake depression operation is released (brake OFF).
[0003]
[Problems to be solved by the invention]
However, when the engine is started at the accelerator ON stage, there is a possibility that sufficient acceleration performance may not be obtained due to a delay in response. On the other hand, when the engine is started at the brake OFF stage, the accelerator operation is performed thereafter. Even when coasting is performed, the engine is maintained in an operating state, and the fuel consumption and exhaust gas reduction effects may be impaired.
[0004]
The present invention has been made against the background of the above circumstances, and the purpose of the present invention is to prevent accelerator operation without impairing fuel consumption and exhaust gas reduction effects when the engine is stopped when the accelerator is off. The purpose is to allow the engine to be restarted with excellent responsiveness.
[0006]
[Means for Solving the Problems]
  In order to achieve such an object, the first invention has (a) an engine and an electric motor as a driving source for traveling, and the electric motor can be driven to rotate, while (b) the engine and the drive. In a hybrid vehicle provided with a power transmission limiting device that is disposed in a power transmission path between the wheels and restricts power transmission from at least the drive wheel side to the engine side, (c) Accelerator OFF during vehicle travel Engine stop means for sometimes stopping the operation of the engine; and (d)When the engine is stopped by the engine stop means, if the vehicle speed is higher than a predetermined vehicle speed, the restriction of power transmission to the engine side by the power transmission limiting device is released to enter a power transmission state, and as the vehicle travels A power transmission switching means for limiting the power transmission to the engine side by the power transmission limiting device when the engine is rotated while being less than the predetermined vehicle speed; (e) AboveWhen the engine is stopped by the engine stop means, andWith control by the power transmission switching means below the predetermined vehicle speedWhen power transmission to the engine side is limited by the power transmission limiting device, the engine is allowed to stop rotating when the brake is on, but the engine is driven to rotate by the electric motor when the brake is off. Standby means to keep it in a startable state;(f)With the accelerator offAnd above the predetermined vehicle speedIn this case, regenerative braking means for taking out electrical energy by regenerative control of a generator rotated as the vehicle travels, making it an energy source of the electric motor and applying a braking force to the vehicle,(g)Electric energy is connected to the electric motor and the generator, and electric energy is supplied to the electric motor when the engine is driven to rotate by the standby means, and electric energy extracted by regenerative control of the generator by the regenerative braking means is And a power storage device that is charged and discharged according to the amount of stored SOC while being charged.
  A second invention is a control device for a hybrid vehicle of the first invention, whereinWhen the power storage device is charged by the regenerative braking means,Power storage device is fully chargedIfThe engine is driven to rotate by the electric motor.
[0007]
Here, the engine stop by the engine stop means means that the fuel supply and ignition are stopped and the self-rotation due to the explosion stops, and does not mean that the engine stops. Brake ON means that the brake operation member, such as a brake pedal depression operation, is braked according to the driver's required braking force to generate a braking force. Brake OFF is a brake operation member releasing operation. This means that the brake is released and accelerator OFF means that the operation of the accelerator operation member such as the accelerator pedal is released and the driver does not request output.
[0010]
【The invention's effect】
  In such a hybrid vehicle control device, when the accelerator is turned off while the vehicle is running, the engine stop means stops the operation of the engine, while the engine is stopped andLess than the prescribed vehicle speedWhen power transmission to the engine side is restricted by the power transmission limiting device, engine rotation is allowed to stop when the brake is ON, but when the brake is OFF, the engine can be started by rotating the engine with an electric motor by standby means Therefore, it is possible to quickly start and accelerate the engine during the accelerator operation while fully enjoying the effect of reducing fuel consumption and exhaust gas by stopping the engine.
[0011]
In other words, since the accelerator is hardly turned on when the brake is on, there is almost no need to start the engine immediately to generate driving force when the brake is on, and the fuel consumption and exhaust gas are reduced by holding the engine in the stopped state. It can be done. On the other hand, when the brake is off, the engine driving force may be required immediately by the accelerator operation. If the engine is stopped and power transmission to the engine side is restricted by the power transmission limiting device, the engine is independent of the vehicle speed. Since the rotational speed is reduced or stopped, the engine cannot be started immediately as it is. For this reason, the engine is rotationally driven by the electric motor so that the engine can be started, so that the engine can be started quickly and the driving force can be generated in accordance with the accelerator operation.
[0012]
  In addition, since the engine is rotationally driven by the electric motor, even when coasting is performed without operating the accelerator while the brake is OFF, the engine does not consume fuel, so there is no risk of deterioration in fuel consumption or exhaust gas. Also, with the accelerator offAnd more than the predetermined vehicle speedIn this case, since the electric energy is taken out by regenerative control of the generator that is rotated as the vehicle travels by the regenerative braking means, it is used as an energy source for the electric motor and a braking force is applied to the vehicle. Even when electric energy is consumed by rotational driving of the engine by the electric motor, sufficient electric energy is ensured and effective use of the electric energy obtained by the generator can be achieved. That is, when charging the electrical energy to the power storage device, when the power storage device is fully charged, the power generation by the regenerative braking means is stopped or the generated electrical energy is discharged as it is. Such electric energy can be effectively consumed by rotationally driving the engine. In addition, when the brake is on, the engine is not driven to rotate by the electric motor, so that a large amount of electrical energy is consumed and the amount of stored electricity is insufficient.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The hybrid vehicle of the present invention only needs to have at least an engine and an electric motor as a driving source for traveling, and can rotate the engine with the electric motor, and the crankshaft of the engine and the motor shaft of the electric motor are integrated. Various types of hybrid vehicles, such as those that are connected to each other, those that are connected via a friction clutch, and those that are connected via a power combining / distributing device such as a planetary gear device. Can be applied. Further, the engine and the electric motor can be used in various usage modes, such as selectively using the vehicle speed or the amount of accelerator operation as a parameter, or using the electric motor in an assisting manner according to the required output.
[0014]
  As the electric motor, a motor generator that can also be used as a generator is preferably used. Regenerative braking means at least accelerator offAnd above the specified vehicle speedIn this case, the kinetic energy of the vehicle is converted into electric energy by regenerative control of the generator that is driven to rotate as the vehicle travels.is there.The regenerative braking means uses the electric energy obtained by the regenerative control of the generator as an energy source of the electric motor. For example, the regenerative braking means is configured to charge a power storage device that supplies electric energy to the electric motor. When the generator and the generator are provided separately, the electric energy generated by the generator can be directly supplied to the electric motor to rotate the engine. Of course, when the storage amount SOC of the power storage device is insufficient, it is possible to separately provide charging means for charging the power storage device by rotating the generator with the engine to extract electric energy.
[0015]
  DThe engine stop means stops the engine at least under the condition that the accelerator is OFF, but other stop conditions such as when the vehicle is decelerated or when the brake is ON can be added. The engine stop means stops the engine when a stop condition such as accelerator OFF is satisfied, and does not restart the engine when the stop condition is no longer satisfied. For example, the accelerator is stopped when the engine is stopped by the engine stop means. Engine restart means for restarting the engine by performing start control such as fuel injection and ignition when a predetermined restart condition is satisfied, such as when the engine is turned on (operation requesting the output of the drive source) Provided.
[0016]
  Standby means when engine is stoppedAnd when the power transmission to the engine side is limited by the power transmission limiting device below the predetermined vehicle speed,Subject to brake OFFThe engine is driven to rotate by an electric motor.However, other execution conditions can be added, such as the stored amount (remaining amount) SOC of the power storage device being equal to or greater than a predetermined value. When the stored amount SOC of the power storage device is less than or equal to a predetermined value, it is desirable to immediately start the engine and prepare for the accelerator ON operation. Further, the engine is kept in a startable state by the standby means, which means that the engine is driven to rotate at a higher rotational speed than the rotational speed at which the engine can rotate by itself due to an explosion caused by fuel supply or ignition, for example, an idle rotational speed. Means.
[0017]
  The power transmission limiting device may be a fluid coupling such as a torque converter, a clutch, a one-way clutch, or the like that completely cuts off power transmission. The torque converter transmits a large torque to the drive wheel side, but the torque transmission to the engine side is small. Therefore, when the lockup clutch is released, the engine rotation is completely performed at a low vehicle speed of, for example, about 40 km / h or less. Stop. The power transmission limiting device whose power transmission state is switched by the clutch is, DynamicWhen the clutch is connected by the force transmission switching means, the power is transmitted, and when the clutch is disconnected, the power transmission is limited.
[0018]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a vehicle hybrid drive device 10 to which the present invention is applied, which includes an engine 12 and a motor generator 14 as a driving source for traveling, and outputs thereof via a torque converter 16. It is transmitted to the automatic transmission 18 and transmitted to the drive wheels from a differential device (not shown) or the like. The crankshaft 12 s of the engine 12 is connected to the motor shaft 14 s of the motor generator 14, and the motor shaft 14 s is connected to the pump impeller 20 of the torque converter 16. The motor generator 14 is used not only as an electric motor but also as a generator. The torque converter 16 includes a lockup clutch 22, and the turbine impeller 24 is connected to an input shaft 26 of the automatic transmission 18.
[0019]
The automatic transmission 18 is a planetary gear type stepped transmission, and includes a planetary gear device and a hydraulic clutch and brake. When these clutches and brakes are connected and disconnected by a hydraulic control circuit 28, A plurality of forward shift speeds, reverse shift speeds, neutrals for interrupting power transmission, and the like are established. The hydraulic control circuit 28 includes an electromagnetic switching valve, a linear solenoid valve, and the like. When these solenoids are controlled by the control device 30, the oil passage is switched or the hydraulic pressure is controlled to control the automatic transmission 18. Are switched, and the lockup clutch 22 of the torque converter 16 is also switched on (connected) and switched off (cut off). The hydraulic control circuit 28 is supplied with hydraulic oil from an oil pump 32 that is rotationally driven integrally with the pump impeller 20 of the torque converter 16, and when the rotation of the torque converter 16 is stopped, that is, the engine. When the operation of the motor generator 14 and the motor generator 14 is stopped, hydraulic oil is supplied from an electric auxiliary oil pump 34 that is rotationally driven by the electric energy of the battery.
[0020]
Since the motor generator 14, the torque converter 16, and the automatic transmission 18 are substantially symmetrical with respect to the center line, the lower half is omitted in FIG.
[0021]
The control device 30 includes one or a plurality of microcomputers that perform signal processing in accordance with a program stored in the ROM in advance using the temporary storage function of the RAM by the CPU, and the hydraulic control circuit 28 and the auxiliary oil In addition to the pump 34, operations of the engine 12, the motor generator 14, and the like are controlled. Various control devices such as a brake switch 40, an accelerator operation amount sensor 44, a drive source rotational speed sensor 46, an input rotational speed sensor 48, and an output rotational speed sensor 50 are connected to the control device 30, and a depression operation of the brake pedal 52 is performed. Brake signal S indicating the presence or absence of_BAnd the depression amount of the accelerator pedal 54 (accelerator operation amount) θ_ACC, Drive source rotational speed N which is the rotational speed of the motor shaft 14s₁, The input rotational speed N which is the rotational speed of the input shaft 26 of the automatic transmission 18._IN, The output rotational speed N which is the rotational speed of the output shaft 56 of the automatic transmission 18._OUTVarious detection signals such as (corresponding to the vehicle speed V) are supplied. The brake pedal 52 corresponds to a brake operation member that is operated according to a required brake force, and the accelerator pedal 54 corresponds to an accelerator operation member that is operated according to a required output.
[0022]
The engine 12 and the motor generator 14 are basically operated so as to generate a driving force corresponding to a driver's required power, and a driving source rotational speed N₁And accelerator operation amount θ_ACCThe battery 58 (see FIG. 2) is used by sequentially switching in accordance with a drive source switching condition such as a predetermined drive source map with the stored amount (SOC) of the battery 58 as a parameter. For example, the motor generator 14 is used at an extremely low vehicle speed such as when starting, but the engine 12 is used mainly during normal driving. In addition, the hydraulic control circuit 28 controls the accelerator operation amount θ._ACCIn addition, control is performed so that the gear position of the automatic transmission 18 is switched in accordance with a shift condition such as a predetermined shift map using the vehicle speed V as a parameter. The battery 58 corresponds to a power storage device.
[0023]
As shown in FIG. 2, the control device 30 also has functions of an engine restarting means 60, an engine stopping means 62, a power transmission switching means 64, a regenerative braking means 66, and a standby means 68. The flowchart shown in FIG. The operation of the engine 12, the motor generator (MG) 14 and the lockup (L / U) clutch 22 is controlled according to the control. The flowchart of FIG. 3 shows a predetermined cycle time during a vehicle operation, that is, when an operation switch such as an ignition key is ON and the shift lever is operated to a travel range such as D (drive). It is executed repeatedly. FIG. 4 is an example of a time chart showing changes in the operating state of each part such as the vehicle speed V when the flowchart of FIG. 3 is executed. Although the flowchart of FIG. 3 is executed even when the vehicle is stopped, it may be executed only during traveling and may be controlled according to another flowchart when stopped.
[0024]
In step S1 in FIG. 3, it is determined whether or not the accelerator pedal 54 is not depressed and the accelerator operation amount θ is set._ACCIs determined by whether or not is less than or equal to a predetermined value of approximately zero. In the case where the accelerator operation amount sensor 44 includes an idle switch, it can also be determined based on whether or not the idle switch is ON. If the accelerator is OFF, step S2 and the subsequent steps are executed. If the accelerator pedal 54 is depressed, step S6 is executed, and the engine 12 and / or the motor generator is executed according to the driver's required power. 14 is activated. The required power of the driver is, for example, the accelerator operation amount θ_ACCAnd drive source rotation speed N₁It is demanded from. In step S6, when the engine 12 is used as a driving source for driving and the operation of the engine 12 is stopped, the motor generator 14 cranks the engine 12 at a predetermined rotational speed, and also supplies fuel and controls ignition. The engine 12 is started by performing start control such as the above.
[0025]
In step S2, fuel supply to the engine 12, ignition control, etc. are stopped, and the operation of the engine 12 is stopped. This step S2 is executed by the engine stop means 62 together with step S1, and the fuel economy and exhaust gas are reduced by stopping the operation of the engine 12 when the accelerator is OFF while the vehicle is running. In this embodiment, the stop condition is that the accelerator is OFF.
[0026]
  In step S3, the predetermined regenerative vehicle speed V is determined in advance.₀It is determined whether or not V ≧ V₀If so, step S4 and subsequent steps are executed to perform regenerative control, while V <V₀In the case of the above, step S7 and subsequent steps are executed. Regenerative vehicle speed V₀In consideration of NVH (Noise, Vibration, Harshness), etc., a constant value of, for example, about 30 to 40 km / hour is set. However, a different value is set according to the shift stage of the automatic transmission 18. And drive source rotation speed N₁And input rotation speed N_INThe determination may be made based on the above. In step S4, the circuit of the hydraulic control circuit 28 is switched to connect the lockup clutch 22 of the torque converter 16, and the motor generator 14 and the automatic transmission 18 are directly connected to each other. In this state, the power can be transmitted directly. As a result, the engine 12 and the motor generator 14 are rotated at a speed corresponding to the vehicle speed V and the gear position of the automatic transmission 18 as the vehicle travels. In step S5, the motor generator 14 is regeneratively controlled, whereby the kinetic energy of the vehicle is converted into electric energy, a braking force is applied to the vehicle, and the battery 58 is charged. Steps S3 and S5 are executed by the regenerative braking means 66, and step S4 is executed by the power transmission switching means 64 in accordance with a command from the regenerative braking means 66.The
[0027]
On the other hand, in step S7, the power transmission switching means 64 switches the circuit of the hydraulic control circuit 28, so that the lockup clutch 22 of the torque converter 16 is disconnected and the power transmission between the motor generator 14 and the automatic transmission 18 is performed. Is performed via the torque converter 16, and the power transmission from the automatic transmission 18 side to the motor generator 14 side (in other words, the power transmission from the drive wheel side to the engine 12 side) is limited. . In step S8, the regenerative control of the motor generator 14 by the regenerative braking means 66 is stopped. Thereby, the rotational speed N of the engine 12 and the motor generator 14₁Is reduced regardless of the running of the vehicle. The first half of FIG. 4 (time t₂Until the vehicle speed V is reduced by turning the accelerator off and the brake on.₁V <V₀And the lockup clutch 22 is disengaged and the regenerative control of the motor generator 14 is stopped. Time t₁Until then, regenerative control is performed by executing steps S4 and S5. The torque converter 16 provided with the lockup clutch 22 corresponds to a power transmission limiting device.
[0028]
In the next step S9, whether or not the brake is ON, that is, whether or not the brake pedal 52 is depressed is determined by the brake signal S._BIs determined by whether or not the brake is ON. If the brake is ON, the process is ended as it is and the steps S1 and after are repeated. In that case, the time t in FIG.₁As shown below, the drive source rotational speed N₁Decreases due to rotational resistance due to the pumping action of the engine 12, etc., and eventually becomes zero. When the stepping operation of the brake pedal 52 is released and the determination in step S9 is NO, step S10 is executed, and the motor generator 14 is driven to rotate by the motor generator 14 so that the engine 12 can be started. Keep it in a state to Time t in FIG.₂Is the time when the brake is turned off, and the subsequent solid line shows the case where the motor generator 14 is operated at the idle rotational speed, and the drive source rotational speed N₁Is held at idle speed. Also, time t₂The subsequent one-dot chain line is a case where the engine 12 and the motor generator 14 are maintained in the operation stop state even when the brake is OFF, and is shown for comparison. Steps S9 and S10 are executed by the standby means 68. In this way, when the motor shaft 14s is rotationally driven by the motor generator 14 at the idle rotational speed, a predetermined creep torque is generated via the torque converter 16 when the vehicle speed V is low, for example, approximately zero.
[0029]
Time t in FIG._ThreeIs the time when the accelerator pedal 54 is depressed, and the accelerator operation amount θ_ACCThe determination in step S1 is NO based on the signal representing the idle switch signal and the idle switch signal, and then step S6 is executed. In step S6, when the engine 12 is used as a driving source for driving, the engine 12 is cranked by the motor generator 14 at a predetermined rotational speed, and start control such as fuel supply and ignition control is performed, whereby the engine 12 is controlled. Although the engine 12 is started, since the engine 12 is already driven to rotate at the idle rotation speed, the engine 12 is started quickly. Time t in FIG._FourIs the time when the engine 12 is started, and then the required power, that is, the accelerator operation amount θ_ACCAnd drive source rotation speed N₁The engine control such as fuel supply and ignition control is performed according to the above. Time t_FiveIs the drive source rotation speed N due to the rotation increase of the engine 12₁Is the input rotation speed N_INThe drive torque is generated in a time exceeding. In this embodiment, the restart condition is that the accelerator pedal 54 is depressed when the engine is stopped. Steps S1 and S6 in that case are executed by the engine restart means 60.
[0030]
FIG. 4 shows a case where the inertial off coasting is performed for a while after the brake is turned off and then the accelerator pedal 54 is depressed, but the accelerator pedal 54 is depressed immediately after the brake is turned off. Even in this case, cranking of the engine 12 is started when the brake is OFF, so that excellent responsiveness can be obtained.
[0031]
On the other hand, in the case of the one-dot chain line in FIG._FiveIs the engine start time t₆Is the drive torque generation time, and the depression time t of the accelerator pedal 54_ThreeThe responsiveness from is poor, and a feeling of stickiness occurs. In FIG. 4, the engine start time t_FiveHowever, although it is the same as the drive torque generation time in the present embodiment, this is just a coincidence and there is no correlation between the two.
[0032]
Thus, in this embodiment, the operation of the engine 12 is stopped by the engine stop means 62 when the accelerator is OFF while the vehicle is running (step S2), while the engine is stopped and the lockup clutch 22 is disconnected. When power transmission to the side 12 is restricted, when the brake is ON (determination in step S9 is YES), the engine 12 is allowed to stop rotating, but when the brake is OFF (determination in step S9 is NO). Since the engine 12 is driven to rotate at the idle rotational speed by the motor generator 14 by the standby means 68 (step S10), the fuel pedal and exhaust gas reduction effect due to the engine stop can be fully enjoyed and the accelerator pedal 54 can be quickly operated. The engine 12 can be started and accelerated.
[0033]
That is, since the accelerator is hardly turned on when the brake is on, there is almost no need to immediately start the engine 12 to generate driving force when the brake is on, and fuel consumption and exhaust gas can be maintained by holding the engine 12 in the stopped state. Can be reduced. On the other hand, when the brake is OFF, the engine driving force may be required immediately by depressing the accelerator pedal 54. However, when the engine is stopped and the power transmission to the engine 12 is restricted by the lock-up clutch OFF, Since the rotational speed of the engine 12 decreases or stops regardless of V, the engine 12 cannot be started immediately as it is. For this reason, the engine 12 is driven to rotate by the motor generator 14 so that the engine 12 can be started (idle rotational speed), so that the engine 12 can be started quickly to generate driving force as the accelerator pedal 54 is depressed. It was made to be able to be made.
[0034]
Moreover, since the engine 12 is driven to rotate by the motor generator 14, even when coasting is performed without the accelerator operation while the brake is OFF on a downhill or the like, the engine 12 does not consume fuel, so fuel consumption and exhaust gas deteriorate. There is no fear of doing. In this embodiment, when the engine 12 is driven to rotate by the motor generator 14, creep torque is generated via the torque converter 16 when the vehicle speed V is low, and the accelerator pedal 54 is depressed in a traffic jam or the like. Alternatively, creep travel can be performed simply by releasing the depression of the brake pedal 52. However, since the engine 12 does not consume fuel at this time, fuel consumption and exhaust gas are saved.
[0035]
In addition, when the accelerator is OFF and the vehicle speed V is the regenerative vehicle speed V₀At the above time, the motor generator 14 is regeneratively controlled by the regenerative braking means 66 to convert the kinetic energy of the vehicle into electric energy to charge the battery 58 and to apply a braking force to the vehicle. Even when electric energy is consumed by the rotational drive of the engine 12 by the generator 14, sufficient electric energy is ensured and effective use of the electric energy obtained by the regenerative control of the motor generator 14 can be achieved. That is, when charging the battery 58 with electric energy, when the battery 58 is fully charged, power generation by the regenerative braking means 66 is stopped or the generated electric energy is discharged as it is. By rotating and driving 12, the electric energy can be effectively consumed. Further, when the brake is ON, the motor generator 14 is not driven to rotate the engine 12, so that a large amount of electric energy is consumed and the stored amount of electricity is insufficient.
[0036]
As mentioned above, although the Example of this invention was described in detail based on drawing, this is an embodiment to the last, and this invention implements in the aspect which added various change and improvement based on the knowledge of those skilled in the art. Can do.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a hybrid drive device to which the present invention is applied.
2 is a block diagram illustrating various functions related to engine stop control when the accelerator is off, which is executed by the control device of FIG. 1; FIG.
FIG. 3 is a flowchart for specifically explaining engine stop control when the accelerator is OFF, which is executed by each function of FIG. 2;
4 is an example of a time chart showing changes in the operation of various parts such as a vehicle speed V, lock-up clutch ON / OFF, motor torque, etc., during execution of engine stop control when the accelerator is OFF in FIG. 3;
[Explanation of symbols]
  10: Hybrid drive device 12: Engine 14: Motor generator (electric motor, generator) 16: Torque converter (power transmission limiting device) 30: Control device 52: Brake pedal 54: Accelerator pedal 58: Battery (power storage device) 62: Engine stop means64: Power transmission switching means    66: Regenerative braking means 68: Standby means

Claims (2)

An engine and an electric motor are provided as a driving source for traveling, and the engine can be rotationally driven by the electric motor, while being disposed in a power transmission path between the engine and the driving wheel and at least from the driving wheel side In a hybrid vehicle including a power transmission limiting device that limits power transmission to the engine side,
Engine stop means for stopping the operation of the engine when the accelerator is off while the vehicle is running;
When the engine is stopped by the engine stop means, if the vehicle speed is higher than a predetermined vehicle speed, the restriction of power transmission to the engine side by the power transmission limiting device is released to enter a power transmission state, and as the vehicle travels Power transmission switching means for rotating the engine while limiting the power transmission to the engine side by the power transmission limiting device when the engine speed is lower than the predetermined vehicle speed;
When the engine is stopped by the engine stop means and the power transmission to the engine side is restricted by the power transmission restriction device by the control by the power transmission switching means below the predetermined vehicle speed , Standby means that sometimes allows the engine to stop rotating, but when the brake is OFF, the electric motor rotates the engine to hold it in a startable state;
When the accelerator is OFF and the vehicle speed is equal to or higher than the predetermined vehicle speed, electric energy is extracted by regenerative control of a generator that is rotated as the vehicle travels, and is used as an energy source for the electric motor and regenerative braking that applies braking force to the vehicle. Means,
The electric energy is connected to the electric motor and the generator, and the electric energy is supplied to the electric motor when the engine is driven to rotate by the standby means, and the electric energy extracted by the regenerative control of the generator by the regenerative braking means is While being charged, a power storage device that is charged and discharged according to the amount of stored SOC,
A control apparatus for a hybrid vehicle, comprising: By the power storage device is charged by the regenerative braking means, in the case where the power storage device is fully charged, the hybrid of claim 1, wherein the rotation-driving the engine with the electric motor Vehicle control device.

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