JPH08163706A - Regenerative brake controller for electric vehicle - Google Patents

Abstract

PURPOSE: To effectively produce a sufficient regenerative brake force when the driver desires sufficient braking while regulating the force by driver's judgment. CONSTITUTION: The regenerative brake controller for an electric vehicle comprises accelerator operation detecting means 23, brake operation detecting means 21, regenerative control means 10 for so controlling a motor as to regeneratively brake when an accelerator is not operated or a brake is operated, and a manual switch 24 for variably setting the force at the time of regeneratively braking. The means 10 is so constituted as to variably control the force responsive to the operation of the switch 24 only when the both the accelerator and the brake are not operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle in which wheels are driven by an electric motor for traveling, and more particularly to a regenerative braking control device for an electric vehicle for controlling regenerative braking by a motor.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of preventing air pollution and reducing noise caused by vehicles, electric vehicles in which wheels are driven by electric motors instead of internal combustion engines have been receiving attention. In such an electric vehicle, so-called regenerative braking can be easily performed. This regenerative braking can be performed by restricting the power supply to the traveling motor and switching the motor to the power generation state. At this time, the load is applied to the drive wheels to brake them and the rotational energy of the drive wheels is changed. It can be recovered as electric energy.

Such regenerative braking is generally controlled so that when the brake pedal is depressed or when the accelerator pedal is released, a braking force is generated in conjunction with this. By the way, regenerative braking when the accelerator pedal is released corresponds to engine braking in the case of a vehicle with an internal combustion engine, but if a constant regenerative braking force occurs at this time, the vehicle speed will drop more than the driver's request. There is.

Further, in low-speed running such as city driving, when regenerative braking is generated, the exciting power supplied to the motor becomes larger, and energy saving cannot be achieved. Therefore, actual Kaihei 4
In -137401, a regenerative braking control device provided with a manual operation means (regenerative braking force setting means) so that the braking force generated by regenerative braking can be set according to the driver's preference.

In this device, the driver can actively generate the regenerative braking force, and can cancel the regenerative braking by manual operation so that the regenerative braking does not work. Further, although the regenerative braking is performed, the regenerative braking at this time is performed. You can also weaken the power. Therefore, for example, if the regenerative braking force corresponding to the engine brake is too strong, the regenerative braking force can be reduced, and the regenerative braking can be canceled at low vehicle speed to save energy.

[0006]

However, in the above-mentioned conventional regenerative braking control device for an electric vehicle according to Japanese Utility Model Laid-Open No. 4-137401, the state where regenerative braking is not effective or the effect of regenerative braking force is weak by manual operation is set. If so, even when the brake pedal is depressed, the regenerative braking may not be effective or weak, and the braking ability may be reduced by the amount of the ineffective regenerative braking force.

The present invention was devised in view of the above-mentioned problems, and while the regenerative braking force can be adjusted according to the driver's preference, when the driver desires sufficient braking, the regenerative braking force is surely provided. An object of the present invention is to provide a regenerative braking control device for an electric vehicle, which is made to be exhibited.

[0008]

Therefore, in the regenerative braking control device for an electric vehicle according to the present invention, the accelerator operation detecting means for detecting the operation of the accelerator pedal and the brake for detecting the operation of the brake pedal are provided. Operation detection means,
Based on the detection information from the accelerator operation detection means and the brake operation detection means, when the accelerator pedal is not operated or the brake pedal is operated, the regenerative control for regenerative braking of the motor is performed. The control means and a manual switch capable of variably setting the regenerative braking force at the time of the regenerative braking, wherein the regenerative control means operates the manual switch only when both the accelerator pedal and the brake pedal are not operated. Is configured to perform variable control of the regenerative braking force according to the above.

According to a second aspect of the present invention, there is provided a regenerative braking control device for an electric vehicle according to the first aspect, wherein the manual switch is configured to release or reduce the regenerative braking force. The control means is configured to perform release or reduction control of the regenerative braking force according to the operation of the manual switch only when neither the accelerator pedal nor the brake pedal is operated. There is.

According to a third aspect of the present invention, there is provided a regenerative braking control device for an electric vehicle according to the first aspect, wherein the regenerative control means detects an operation amount of the brake pedal when the operation of the brake pedal is detected. Is configured to control the regenerative braking force according to the above.

[0011]

In the regenerative braking control system for an electric vehicle according to the first aspect of the present invention, the regenerative control means operates the accelerator pedal based on the detection information from the accelerator operation detecting means and the brake operation detecting means. When the brake pedal is not operated or the brake pedal is operated, the motor is controlled to perform regenerative braking. On the other hand, the regenerative braking force at the time of regenerative braking is set through the manual switch.However, the regenerative control means responds to the regenerative braking force set through the manual switch only when neither the accelerator pedal nor the brake pedal is operated. Regenerative braking. vice versa,
If the brake pedal is also operated, the setting through this manual switch is invalidated, and regenerative braking is controlled according to the brake operation.

In the regenerative braking control device for an electric vehicle according to the second aspect of the present invention, since the manual switch is configured to release or reduce the regenerative braking force, the regenerative control means includes: Only when both the accelerator pedal and the brake pedal are not operated, the release or reduction of the regenerative braking force according to the operation of the manual switch is controlled, and if the brake pedal is operated, the manual switch is operated. The setting becomes invalid and regenerative braking is controlled according to the brake operation.

In the regenerative braking control device for an electric vehicle according to the third aspect of the present invention, when the operation of the brake pedal is detected by the regenerative control means, the regenerative braking control is performed according to the operation amount of the brake pedal. Since the power is controlled, the regenerative braking force corresponding to the braking request is generated.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. First, a regenerative braking control device for an electric vehicle as a first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a battery, and the battery 1 can be repeatedly charged by an external charger that is not installed in the vehicle. A traveling motor 2 is supplied with electric power from the battery 1, and the driving wheels 3 of the automobile are driven by the motor 2. A motor controller (electric power conversion circuit) 4 is provided between the battery 1 and the motor 2, and the electric power from the battery 1 is adjusted to a required size through the motor controller 4 and supplied to the motor 2. It has become.

The motor controller 4 is controlled by the travel management controller 5. The travel management controller 5 controls the output of the motor 2 through the motor controller 4 according to the depression amount of the accelerator pedal. A regeneration control unit 10 is provided in the travel management controller 5. In the regenerative controller 10,
Although regenerative braking is controlled, regenerative braking itself, as is well known, controls the supply of electric power to the traveling motor 2 and switches the motor 2 to a power generation state to apply a load to the drive wheels and, conversely, to the motion of the drive wheels. This is braking in which energy is recovered and the battery 1 is charged with this energy as electric energy.

In the regenerative control unit 10, the traveling motor 2
The required regenerative braking force is obtained while controlling the power supply to the vehicle. For example, when the power supply to the traveling motor 2 is completely cut off, the maximum regenerative braking force is obtained, and when the power supply to the traveling motor 2 is restricted, the regenerative braking force according to the restriction is obtained. The control of the regenerative braking by the regenerative control unit 10 is performed based on the brake operation information, the accelerator operation information, and the regenerative braking force setting information of the driver, and the determination means 11 determines whether to perform the regenerative braking and the regenerative braking. The regenerative braking force is set, and a control signal is output from the instructing means 12 to the motor controller 4 and a lighting command signal is output to the cancel indicator in the combination meter 13 based on the determination result. ing.

For this reason, the regeneration control section 10 includes a brake switch 21 and a brake depression amount detector 22 as brake operation detecting means, an accelerator switch 23 as accelerator operation detecting means, and a regeneration cancel switch 24 as a manual switch. It is connected so that detection signals and setting signals can be input. Then, in the regenerative control unit 10,
When a brake pedal (not shown) is depressed and the brake switch 21 is turned on, the regenerative braking force corresponding to the depression operation of the brake pedal detected by the brake depression amount detector 22 is generated as shown by a straight line A in FIG. 2, for example. To happen,
The regeneration of the motor 2 is controlled through the motor controller 4. Further, the motor controller 4 is controlled so that the regenerative braking force is generated even when the accelerator pedal (not shown) is released and the accelerator switch 23 is turned on.

The regenerative cancel switch 24 as a manual switch is operated by the driver, and when the regenerative braking is unnecessary, the regenerative cancel switch 24 is turned on. However, the command of the manual switch 24 is valid when the accelerator switch 23 is on (the accelerator opening is 0), but is invalid when the brake switch 21 is on.

That is, in the regenerative control unit 10, at the time of braking, regardless of the setting of the manual switch 24, the regenerative braking force corresponding to the depression operation of the brake pedal (see FIG. 2).
And the accelerator opening becomes 0 when the brake operation is not performed, the regenerative braking is canceled according to the setting of the manual switch 24. Since the regenerative braking control device for the electric vehicle as one embodiment of the present invention is configured as described above, the regenerative braking control is performed through the regenerative control 10 as shown in FIG. 3, for example.

That is, first, based on the detection signal from the accelerator switch 23, it is determined whether or not the accelerator is off (step S10). If the accelerator is off, the regeneration cancel switch 24 is turned on in step S20. It is determined whether or not it is being operated. If the regenerative cancel switch 24 has not been turned on, the process proceeds to step S50 to activate the regenerative braking so that a predetermined regenerative braking force is generated.

On the other hand, if the regeneration cancel switch 24 is turned on, the process proceeds to step S40, and it is determined whether or not the brake switch is on. If the brake switch is not turned on, that is, if the brake operation is not performed, the regenerative braking is canceled in step S40, and at the same time, the cancel indicator in the combination meter 13 is turned on.

If the brake switch is on, that is, if the brake operation is not performed, regenerative braking according to the brake operation amount is performed in step S50. In this way, when the brake is operated, the regenerative braking force can be obtained regardless of the cancel setting of the manual switch 24. Therefore, if the driver depresses the brake pedal as usual, the regenerative braking force is added to the braking force by the mechanical brake. It becomes possible to obtain a braking force added with, and it becomes easy to obtain a sufficient braking force even when sudden braking is requested.

Of course, the cancel setting of the manual switch 24 is effective when the accelerator is off and the brake is also off, and regenerative braking corresponding to engine braking can be canceled by the driver's intention. For example, regenerative braking corresponding to engine braking is possible. If the power is too strong, the operation can be canceled, and regenerative braking can be canceled at low vehicle speeds to save energy.

Next, a regenerative braking control device for an electric vehicle as a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, as shown in FIG. 4, a regenerative braking force control switch 25 is provided as a manual switch instead of the regenerative cancel switch 24. The regenerative braking force setting switch 25 can set the regenerative braking force according to the operation amount thereof, as indicated by a straight line B shown in FIG.

Then, in the regenerative control section 10, at the time of braking, regardless of the setting of the manual switch 25, the regenerative braking force corresponding to the depression operation of the brake pedal (see FIG. 2).
And the accelerator opening becomes 0 when the brake operation is not performed, the regenerative braking is performed with the regenerative braking force according to the setting of the manual switch 25. With such a configuration, at the time of brake operation, the regenerative braking force according to the amount of brake operation can be obtained. Therefore, if the driver depresses the brake pedal as usual, the regenerative braking force is added to the braking force by the mechanical brake. The added braking force is obtained.

By setting the manual switch 25, the regenerative braking force corresponding to the engine brake can be adjusted by the driver's intention. For example, if the regenerative braking force corresponding to the engine brake is too strong, the regenerative braking force can be decreased. In low vehicle speed running, regenerative braking can be canceled (that is, regenerative braking force is 0) to save energy.

[0027]

As described in detail above, according to the regenerative braking control device for an electric vehicle of the present invention, the accelerator operation detecting means for detecting the operation of the accelerator pedal and the operation of the brake pedal are detected. Based on the detection information from the brake operation detecting means, the accelerator operation detecting means and the brake operation detecting means, the motor is regenerated when the accelerator pedal is not operated or the brake pedal is operated. A regenerative control means for controlling to brake, and a manual switch capable of variably setting the regenerative braking force at the time of regenerative braking. Only by configuring the variable control of the regenerative braking force according to the operation of the manual switch, On that can reflect the intention driver in operation of the regenerative braking, which corresponds to engine braking, ensure regenerative braking force is obtained at the time of braking operation, emergency braking capability is ensured.

According to the regenerative braking control device for an electric vehicle of the present invention as set forth in claim 2, in the structure of claim 1,
The manual switch is configured to release or reduce the regenerative braking force, and the regenerative control means responds to the operation of the manual switch only when neither the accelerator pedal nor the brake pedal is operated. By configuring to release or reduce the regenerative braking force, the driver operates the manual switch if the driver feels that the regenerative braking is unnecessary or too effective in the operating state of the regenerative braking equivalent to engine braking. As a result, the regenerative braking can be reflected in the regenerative braking, and the regenerative braking force can be surely obtained at the time of the brake operation, so that the braking ability in an emergency can be secured.

According to the regenerative braking control device for an electric vehicle of the present invention as set forth in claim 3, in the structure of claim 1,
Since the regenerative control means is configured to control the regenerative braking force according to the operation amount of the brake pedal when the operation of the brake pedal is detected, the regenerative braking force according to the driver's braking intention. Is obtained, and the braking performance is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a regenerative braking control device for an electric vehicle as a first embodiment of the present invention.

FIG. 2 is a diagram showing setting of a regenerative braking force of a regenerative braking control device for an electric vehicle as a first embodiment of the present invention.

FIG. 3 is a flowchart showing a regenerative braking control of the regenerative braking control device for the electric vehicle as the first embodiment of the present invention.

FIG. 4 is a configuration diagram showing a regenerative braking control device for an electric vehicle as a second embodiment of the present invention.

FIG. 5 is a diagram showing setting of a regenerative braking force of a regenerative braking control device for an electric vehicle as a second embodiment of the present invention.

[Explanation of symbols]

1 is a battery 2 a traveling motor 3 a drive wheel 4 a motor controller (electric power conversion circuit) 5 a traveling management controller 10 a regenerative control unit 11 a judging means 12 an indicating means 13 a combination meter 21 a brake switch 22 as a brake operation detecting means 22 a brake stepping amount detector 23 Accelerator Switch as Accelerator Operation Detection Means 24 Regenerative Cancel Switch as Manual Switch 25 Regenerative Braking Force Control Switch as Manual Switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinya Furukawa 5-3-8 Shiba, Minato-ku, Tokyo Within Mitsubishi Motors Corporation (72) Inventor Masao Kato 5-3-8 Shiba, Minato-ku, Tokyo Mitsubishi Automobile Industry Co., Ltd. (72) Inventor Nobuyuki Kawamura 5-3-8, Shiba, Minato-ku, Tokyo Mitsubishi Motors Industry Co., Ltd.

Claims (3)

[Claims] 1. An accelerator operation detecting means for detecting an operation of an accelerator pedal, a brake operation detecting means for detecting an operation of a brake pedal, and detection information from the accelerator operation detecting means and the brake operation detecting means. , When the accelerator pedal is not operated or when the brake pedal is operated, a regenerative control means for controlling the motor to regeneratively brake, and a manual switch capable of variably setting the regenerative braking force at the regenerative braking. In addition, the regenerative control means is configured to perform the variable control of the regenerative braking force according to the operation of the manual switch only when neither the accelerator pedal nor the brake pedal is operated. A regenerative braking control device for an electric vehicle, comprising: 2. The manual switch is configured to release or reduce the regenerative braking force, and the regenerative control means only when the accelerator pedal and the brake pedal are not operated. 2. The regenerative braking control device for an electric vehicle according to claim 1, wherein the regenerative braking control device is configured to release or reduce the regenerative braking force according to the operation of. 3. The regenerative control means is configured to control the regenerative braking force according to the operation amount of the brake pedal when the operation of the brake pedal is detected. Item 1. A regenerative braking control device for an electric vehicle according to item 1.