JP2579650Y2 - Regenerative brake control device for electric vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative brake control device for an electric vehicle that uses a motor as a drive source and obtains a braking force by regenerative braking of the motor.

[0002]

2. Description of the Related Art Conventionally, in an electric vehicle driven by an electric motor, a braking force is obtained by operating the electric motor as a generator when the vehicle is decelerated. The brake force is controlled in such a manner that two-step control is performed such that a weak regenerative braking force is obtained by turning off the accelerator, and a strong regenerative braking force is obtained by turning on the brake.

[0003]

However, in such a conventional regenerative brake braking device for an electric vehicle, since the control is performed in two stages, it is possible to efficiently perform the energy recovery efficiency by using the regenerative brake. There is a problem that cannot be done.

[0004] The present invention has been the view made keeping in mind the above problems, the use of by changes actively regenerative braking to regenerative braking, the electric vehicle in which the recovery of high energy so performed An object is to provide a regenerative brake control device.

[0005]

[SUMMARY OF To this end, the regenerative brake control apparatus for an electric vehicle according to the present invention is an electric motor as a drive source, the regenerative brake control apparatus for an electric vehicle obtaining a braking force by the regenerative braking of the electric motor, the vehicle Provided in
Brake operation detection to detect the operating state of the brake pedal
Release means and the brake pedal independently by manual operation.
The regenerative braking force can be set arbitrarily and manual operation is not possible.
Operation to return to the initial position of the regenerative braking force without being performed
A regenerative braking force setting means having a member, the brake Misao
That the brake pedal is operated by the operation detection means
Is detected, it is generated independently of the brake pedal.
Jill regenerative braking force is characterized in that a braking Gosuru regenerative braking control means such that the regenerative braking force which is <br/> set by regenerative braking force setting means.

[0006]

In the above-described regenerative brake control device for an electric vehicle according to the present invention, the regenerative brake force is set by manually operating the regenerative brake operating member. When the operating member is released, the operating member returns to the regenerative brake release position by the regenerative braking force setting means. Also, the brake operation detection means
When detecting that the rake pedal is being operated
When the operating member of the regenerative brake setting unit is operated, the regenerative brake control unit operates independently of the brake pedal.
Brake braking is performed such that the generated regenerative braking force becomes the set regenerative braking force.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 6 show a regenerative brake control device for an electric vehicle as an embodiment of the present invention.
Is a control block diagram of the present control device, FIG. 2 is an overall configuration diagram in which the present control device is installed in a vehicle, FIG. 3 is a winding connection diagram when the present motor is a DC shunt motor, and FIG. FIG. 5 is a flow chart for explaining the operation of the present control device. FIG. 6 is a graph showing the relationship between the operation amount of the control switch and the regenerative braking force.
FIG. 3 is a diagram showing a relationship between an increase / decrease in an operation amount of an operation member and an increase / decrease in a regenerative braking force in a case where the electric motor is a DC motor. In each drawing, the same reference numerals indicate substantially the same parts.

First, a description will be given of a configuration in which the present apparatus is installed in an automobile. In FIG. 2, an electric motor 2 is provided on a vehicle body 1 as a drive source. It is configured to be connected to a certain drive wheel 4.

A motor control unit 5 for controlling the electric motor 2 is provided. The motor control unit 5 includes an accelerator sensor 6 for detecting the amount of depression of an accelerator pedal (not shown), and a brake pedal (see FIG. Stop lamp switch that detects the ON / OFF state of a stop ( not shown)
Ramp switch) 7 and regenerative braking force setting means 8 are connected. In this figure, reference numeral 13 denotes a non-drive wheel which is a front wheel.

The regenerative braking force setting means 8 sets the regenerative braking force to linear by manually operating the operating member 9 and automatically releases the operating member 9 when the operating member 9 is released. It is configured to return to the force release position. The operating member 9 is specifically configured as a regenerative braking control switch. When the switch is turned on by pushing or pulling the handle 9a, and the stop lamp 7 satisfies the ON condition. By activating the regenerative brake control means 11 of the motor control unit 5 and releasing the hand from the handle 9a, the switch 9 is turned off and the operation of the regenerative brake force control means 11 is released.

On the other hand, the motor control unit 5
As shown in FIG. 1, it is configured to include a motor driving force control unit 10, the regenerative brake control unit 11, and a switching unit 12.

The motor driving force control means 10 of the motor control unit 5 generates a motor driving force control signal in accordance with the accelerator depression amount information from the accelerator sensor 6.

The regenerative brake control means 11 operates the operating member 9 of the regenerative braking force setting means 8 in a state where the brake pedal is ON, so that the regenerative braking is performed so that the regenerative braking force corresponds to the operation amount. A force control signal is generated. Accordingly, the regenerative brake control means 11 obtains detection signals from the stop lamp switch 7 and the regenerative brake force setting means 8,
This generates the control signal as described above.

Further, the switching means 12 switches control signals from the motor driving force control means 10 or the regenerative brake control means 11 and supplies one of the control signals to the electric motor (motor) 2.

Here, the method of regenerative braking will be described more specifically. When the motor 2 is a DC shunt motor, as shown in the connection diagram in FIG. By increasing or decreasing the amount in accordance with the operation amount of the operation member 8, the field force increases or decreases and the regenerative braking force increases or decreases as shown in FIG.

When the motor 2 is an induction motor,
Assuming that the synchronous speed of the field of the induction motor is n ₀ and the rotation speed of the rotor is n, the slip S of the motor can be obtained by S = (n ₀ −n) / n ₀ . By changing the frequency, n ₀ can be changed. That is, the synchronous speed is changed by the moving magnetic field generated by the change in the frequency of the alternating current applied to the stator coil 18 shown in FIG. In the case of the induction motor, if S> 0, the motor becomes an electric motor, and if S <0, it becomes a generator. Therefore, by controlling the frequency so that S <0, a regenerative braking force can be obtained. In this case, the regenerative braking force increases as S decreases.

Further, the graph shown in FIG. 6 shows the relationship between the regenerative brake control switch, that is, the operation amount of the operation means 8 and the regenerative braking force. As the operation amount of the operation means 8 increases, the regenerative braking force increases. It shows that it increases linearly.

Next, the operation, operation, and effects of the present control device having the above configuration will be described with reference to a flowchart shown in FIG. 5. First, when the accelerator pedal is depressed, the electric motor 2 operates according to the depression amount. The electric motor 2 is controlled by a control signal from the motor driving force control means 10, and the vehicle travels with a driving force corresponding to the amount of depression of the accelerator pedal.

When a brake pedal (not shown) is depressed, the stop lamp is turned on by the stop lamp switch 7, and it is determined in step S1 whether the brake pedal is depressed. If the brake pedal is depressed, In step S2, the amount of operation of the regenerative brake control switch (operating means) 8 is detected, and in step S3, the regenerative brake is turned on according to the amount of operation, and the regenerative braking force as shown in FIG. A braking operation is performed.

As described above, since the regenerative braking force can be linearly changed according to the operation amount of the regenerative brake control switch (operation means) 8 and the regenerative braking force can be used actively, high energy can be recovered. There is.

Further, when the operating means 8 is released from the operating means 8, the operating means 8 returns to the original brake release position, so that the regenerative braking force acts only when the operating means 8 is operated, so that the safety of operation can be ensured. There is.

Further, if it is determined in step S1 that the brake has not been depressed, the regenerative braking force is turned off as in step S5.
A step S4 for determining whether the accelerator is ON or OFF is inserted between step S5 and step S5. When the accelerator is ON, the process proceeds to step S5, and the regenerative brake is turned OFF. The weak regenerative brake in step S6 is activated.

[0023]

As described above in detail, according to the regenerative brake control device for an electric vehicle of the present invention, a regenerative brake control device for an electric vehicle that uses an electric motor as a drive source and obtains a braking force by regenerative braking of the electric motor. Installed in the vehicle
Brake operation detection to detect the operating state of the brake pedal
Release means and the brake pedal independently by manual operation.
The regenerative braking force can be set arbitrarily and manual operation is not possible.
Operation to return to the initial position of the regenerative braking force without being performed
A regenerative braking force setting means having a member, the brake Misao
That the brake pedal is operated by the operation detection means
Is detected, it is generated independently of the brake pedal.
Jill since regenerative braking force and a braking Gosuru regenerative brake control means so that the regenerative braking force and set by the regenerative braking force setting unit, the brake pedal
Regardless of the operation amount, only in the case of operating the operating member manually, by using to change the regenerative braking force actively regenerative braking, efficient can make recovery of high energy There is an advantage that a brake operation can be performed.

[Brief description of the drawings]

FIG. 1 is a control block diagram of a regenerative brake control device of an electric vehicle as one embodiment of the present invention.

FIG. 2 is an overall configuration diagram in which a regenerative brake control device for an electric vehicle as one embodiment of the present invention is installed in a vehicle.

FIG. 3 is a winding connection diagram when the motor according to the present invention is a DC shunt motor.

FIG. 4 is a diagram illustrating a slip when the electric motor according to the present invention is an induction motor.

FIG. 5 is a flowchart illustrating the operation of the present invention.

FIG. 6 is a graph showing a relationship between an operation amount of a control switch and a regenerative braking force according to the present invention.

FIG. 7 is a diagram showing a relationship between an increase / decrease in an operation amount of an operation member and an increase / decrease in a regenerative braking force when the electric motor according to the present invention is a DC motor.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 vehicle body 2 electric motor 3 transmission 4 drive wheel 5 motor control unit 6 accelerator sensor 7 stop lamp switch (brake operation detection means) 8 regenerative brake force setting means 9 operating member (regenerative brake control switch) 9a handle 10 motor drive force control means 11 Regenerative brake control means 12 Switching means 13 Non-drive wheel

Claims (1)

(57) [Scope of request for utility model registration] A regenerative brake control device for an electric vehicle that uses an electric motor as a drive source and obtains a braking force by regenerative braking of the electric motor detects an operation state of a brake pedal provided on the vehicle.
The brake operation detecting means and the brake pedal are arbitrarily turned manually by an independent operation.
A state in which the raw braking force can be set and no manual operation is performed
Operation member that returns to the initial position of the regenerative braking force
The brake pedal is operated by the regenerative braking force setting means and the brake operation detecting means.
When it is detected that the brake pedal is
Is independent of the regenerative braking force
Characterized in that a braking <br/> Gosuru regenerative braking control means such that the regenerative braking force set by the constant section, of the electric vehicle regenerative brake control apparatus.