Combined hydraulic and regenerative brake system in an electric

Details Combined hydraulic and regenerative brake system in an electric Combined hydraulic and regenerative brake system in an electric

1997-10-15

1999-01-12

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Regenerative brakes

180 651, 303 3, B60L 724, B60T 826

Patent

active

058577556

ABSTRACT:
In an electric vehicle the driven wheels connected to an electric motor are liquid-pressure braked in a condition in which a differential pressure regulating valve interposed between the driven wheels and a master cylinder has been opened, and the driven wheels are regeneratively braked in a condition in which the differential pressure regulating valve has been closed to inhibit the liquid pressure braking. By temporarily opening the differential pressure regulating valve at the start of depression of the brake pedal, a stroke of the brake pedal depending upon the play of the brake caliper is previously absorbed. Thus, when the differential pressure regulating valve has been opened to switch over the regenerative braking to the liquid pressure braking, the change in stroke of the brake pedal can be reduced by a stroke amount that corresponds to the play of the brake caliper. Therefore, it is possible to prevent the stroke of the brake pedal from being largely changed upon switching-over of from regenerative braking to a liquid pressure braking, thereby improving the braking feeling.

REFERENCES:
patent: 4270806 (1981-06-01), Venkataperumal et al.
patent: 5433512 (1995-07-01), Aoki et al.
patent: 5542754 (1996-08-01), Aoki et al.

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