JP3173372B2 - Control device for hybrid vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the stability of a vehicle when it runs at a low speed, by a method in which the driving condition of the vehicle is detected from an acceleration command and deceleration command from a driver, the appropriate number of rotations of the vehicle is estimated from the detected driving condition of the vehicle, the wheels are driven by a motor when a brake is released at the time of acceleration, and a regenerative braking is started at the time of deceleration. SOLUTION: A hybrid vehicle has front wheels 2 driven by an engine 1 and rear wheels 4 driven by a regenerative motor 3. When an acceleration command is detected (5), the appropriate number of rotations of the rear wheels 4 is estimated (7) and the motor 3 is so controlled by a controller 9 which drives the rear wheels 4 that the motor speed may not exceed the appropriate number of rotations of the rear wheels 4. The rear wheels 4 are so controlled by the motor 3 that they may be driven at a rotating speed which is within the appropriate range. When a deceleration command is detected (6), the appropriate number of rotations of the rear wheels 4 which are driven by the motor 3 is estimated (7) and the operating condition of an antilock brake system is monitored and whether the brake is released or not is detected (8) and then the motor 3 is controlled (9) based on the detected values and power is supplied to the motor from a capacitor 10 through an inverter 11 and is regenerated. By this method, the vehicle can be started up and accelerated even on a road of low friction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine for driving either one of a front wheel and a rear wheel to store regenerative power during braking in a capacitor, and powering the vehicle using the power stored in the capacitor. The present invention relates to a control device for a hybrid vehicle in which the other of the rear wheels or the front wheels is driven by a motor that generates the following.

[0002]

2. Description of the Related Art Conventionally, as a control device for a hybrid vehicle using both an engine and a motor, for example, Japanese Unexamined Patent Publication No.
No. 25403. This is a motor that drives the rear wheels of the vehicle, a battery that supplies power to the motor, a generator that is driven by the engine and supplies generated power to the battery, and a power that transmits the driving force of the engine to the front wheels. A transmission device, a vehicle speed determining means for detecting a vehicle speed, and transmitting the engine driving force to the front wheels when it is determined that the vehicle is in the high speed running range from the detected vehicle speed, and the motor driving force when it is determined that the vehicle is in the low to medium speed running range. 1 is a control device for a hybrid vehicle configured to transmit to a rear wheel.

[0003]

However, in such a conventional hybrid vehicle control device, the driving force of the engine is transmitted to the front wheels when the vehicle speed judging means judges that the vehicle is in a low to medium speed running range. Therefore, there is a problem that it is difficult to obtain stability at the time of sudden start or sudden deceleration on a low friction coefficient road because the rear wheel drive is performed only by the motor.

Further, since transmission of the driving force of the engine is limited only by the vehicle speed, the driving force of the engine is intermittent regardless of the driver's intention, and the driver feels a sense of discomfort every time. There was also a problem.

The present invention has been made in view of such conventional problems, and secures the stability of a vehicle in a low-to-medium-speed running range, and starts from acceleration or deceleration to stopping on a low friction coefficient road. It is an object of the present invention to ensure stability at low speed and to prevent a driver from feeling uncomfortable when engine driving force is intermittent.

[0006]

According to a first aspect of the present invention, there is provided a control apparatus for a hybrid vehicle, wherein one of a front wheel and a rear wheel is driven by an engine, and regenerative electric power during braking is stored in a capacitor. A hybrid vehicle in which the other of the rear wheels or the front wheels is driven by a motor that generates power using the electric power stored in the capacitor, and a means for detecting a driver's acceleration command; Means for detecting a deceleration command, means for detecting the motion state of the vehicle and estimating an appropriate rotation speed of wheels driven by the motor, and an anti-lock brake system.
That the brakes are in the released state
Means for detecting the acceleration instruction before without exceeding the proper rotational speed estimated by the estimating means to be detected
While driving the wheels on the side driven by the serial motor, before
When the deceleration command is detected, the motor
The anti-lock brake against the wheel being driven
Key system detects the release status of the braking device.
If not, the above-mentioned mode is set so that regenerative braking is performed.
Controlling the driving force of the wheels driven by the motor,
The anti-lock brakes against wheels driven by
The release status of the braking device is detected by the rake system.
If it is issued, the direction of torque generation of the motor is
Control means is provided for controlling the driving force of the wheels driven by the motor so as to reverse from the regenerating direction to the driving direction .

[0007]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows the configuration of a control device for a hybrid vehicle according to the present invention, in which a front wheel 2 driven by an engine 1 and a regenerable motor 3
And a rear wheel 4 driven by the A detecting means 5 for detecting a driver's acceleration command and a detecting means 6 for detecting a driver's deceleration command; an estimating means 7 for estimating an appropriate rotation speed of the rear wheel 4 driven by the motor 3; Detecting means 8 for monitoring the operation status of the antilock brake system (ABS) and detecting that the braking device is in the released state, and the motor 3 based on the detection values from the respective detecting means.
, A capacitor 10 that supplies electric power to the motor 3 and can store electricity during regeneration, and an inverter 11 that performs transmission of electric power between the capacitor 10 and the motor 3 according to an instruction from the control means 9. It is composed of

Next, the operation of the control device having the above configuration will be described. First, when the acceleration command detecting means 5 detects that the driver has accelerated, the motion state of the vehicle is detected, and an appropriate rotation speed of the rear wheel 4 is obtained by the estimation means 7. The control means 9 controls the motor 3 so that the rear wheel 4 is driven. Since the rear wheel 4 is always driven and controlled by the motor 3 within a range not exceeding an appropriate rotation speed, the rear wheel 4 grips the road surface, and stable start and acceleration can be performed even on a low friction road. In particular, even when the friction coefficient of the road surface is so great that the friction coefficient of the road surface with which the front wheel 2 and the rear wheel 4 of the vehicle come into contact is greatly different, the rear wheel 4 is driven by the motor 3 within a range not exceeding the estimated proper rotation speed. Since the vehicle is controlled, stable start and acceleration can be performed without losing the grip with the road surface. Further, since the drive control of the rear wheel 4 by the motor 3 is performed according to the driver's acceleration command, the driver can start and accelerate the hybrid vehicle without feeling uncomfortable with his own acceleration instruction. it can.

Next, the operation when the driver's deceleration command is detected will be described. Detecting means 6 for decelerating the driver
, The motor 3 starts regenerative braking. The proper rotation speed of the rear wheel 4 during regenerative braking is obtained by the estimating means 7, and the control of the motor 3 is performed by the control means 9 within a range not exceeding the proper rotation speed. Stable deceleration and stopping can be performed without losing the grip. Electric power generated by the motor 3 by regeneration is stored in the capacitor 10 via the inverter 11.

Even if the detecting means 6 detects the driver's deceleration command, if the ABS is activated and the release of the braking device is detected by the detecting means 8, the regeneration by the motor 3 is performed. The braking is temporarily interrupted, and the control means 9 immediately transmits the reverse torque in the drive direction acting on the rear wheel 4 to the rear wheel 4 by the motor 3 to prevent the lock of the vehicle. Further, even when transmitting the reverse torque, the control unit 9 controls the motor 3 within a range that does not exceed the proper rotation speed obtained by the estimating unit 7 so that the proper rotation speed of the rear wheel 4 is controlled. 4 can always perform stable deceleration and stopping without losing grip with the road surface.

Further, the transmission of the reversing torque to the wheels driven by the motor is performed only while the release of the braking device by the operation of the ABS is detected, and the deceleration command of the driver is detected by the detecting means 6. During this time, the release of the braking device is released, and the mode is switched again to the regenerative braking by the motor 3, and the same control as described above is performed. Further, as in the case of starting and accelerating, the auxiliary drive control of the rear wheel 4 by the motor 3 described above is performed according to the driver's deceleration command, so that the driver does not feel uncomfortable with his own deceleration command. Can be decelerated and stopped.

In the above-described embodiment, the case where the front wheel 2 is driven by the engine 1 and the rear wheel 4 is driven by the motor 3 has been described. It is needless to say that the present invention can be applied to a device that drives the front wheel 2.

[0013]

As described above, the control apparatus for a hybrid vehicle according to the present invention has the above-described structure, so that the wheels driven by the motor can always start and accelerate stably without losing the grip with the road surface. In addition to being able to perform deceleration and stoppage, the control of wheels driven by the motor is performed based on the driver's acceleration / deceleration command, so that the driver does not feel uncomfortable even if the engine is intermittently driven.

Also, at the time of starting and accelerating, decelerating and stopping, the wheels driven by the motor are driven within a range not exceeding an appropriate number of revolutions. Even without losing grip, the driver can capture the road surface and run stably. Furthermore, deceleration
Even if the instruction is detected,
Rake system detects brake release status
The motor torque generation direction is the regeneration direction.
To the driving direction from the
Life is reliably prevented.

Further, in addition to the above-described effects, since a capacitor is used in the power storage device, it is possible to charge and discharge a large current more rapidly than in a hybrid vehicle using a battery as a power storage device. As a result, the charging and discharging can be performed with high efficiency. In particular, there is an effect that the fuel consumption on the engine side is improved by improving the charge acceptability during energy regeneration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a control device for a hybrid vehicle according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Front wheel 3 Motor 4 Rear wheel 5 Acceleration command detecting means 6 Deceleration command detecting means 7 Estimating means 8 ABS detecting means 9 Control means 10 Capacitor 11 Inverter

──────────────────────────────────────────────────の Continuation of front page (51) Int.Cl. ⁷ identification code FI F02D 29/02 B60K 9/00 E (58) Field surveyed (Int.Cl. ⁷ , DB name) B60L 11/14 B60K 6 / 02 B60K 17/04 B60L 3/00 B60L 7/10 F02D 29/02

Claims (1)

(57) [Claims] An engine drives one of a front wheel and a rear wheel so that regenerative power during braking can be stored in a capacitor, and a regenerative power generated by the power stored in the capacitor is generated by a motor. A hybrid vehicle in which the other of the wheels or the front wheels is driven, a means for detecting a driver's acceleration command, a means for detecting a driver's deceleration command, and a motor driven state detected by detecting the motion state of the vehicle. Means for estimating the appropriate number of rotations of the wheels and the operation of the anti-lock brake system
While driving means for detecting that it is in the released state, the wheels of the acceleration side instruction is driven by the motor without exceeding the proper rotational speed estimated by the estimating means to be detected, the When a deceleration command is detected, the motor is being driven by the motor.
With the anti-lock brake system for the wheels
When the release state of the braking device is not detected
Is driven by the motor so that regenerative braking is performed
Control the driving force of the wheels, driven by the motor
To the anti-lock brake system
When the release state of the braking device is detected from
Drive the torque generation direction of the motor from the regenerative direction
Control means for controlling the driving force of the wheels driven by the motor so as to reverse the direction .