Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1993-11-15
1995-07-18
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
180 651, 180165, 188156, 188159, 303 20, 303100, B60T 1374, B60T 858, B60L 710
Patent
active
054335124
ABSTRACT:
In an electric vehicle capable of regenerative braking of wheels, a differential pressure regulating valve is interposed between a master cylinder for generating a hydraulic braking pressure by operation of a brake operating element and a brake cylinder for a driven wheel. In a first region in which an input hydraulic pressure into the differential pressure regulating valve is equal to or less than a predetermined value, an output hydraulic pressure from the differential pressure regulating valve is maintained at zero, and in a second region in which the input hydraulic pressure exceeds the predetermined value, the output hydraulic pressure is lower than the input hydraulic pressure by the predetermined value. Further, in the first region, a regenerative braking force is determined in proportion to a quantity of operation of the brake operating element, and in the second region, the regenerative braking force is maintained at a constant value irrespective of the quantity of operation of the brake operating element. Thus, the regenerative braking force is preferentially generated at the start of braking, and after the regenerative braking force reaches a limit, a deficiency of braking force can be made up by the hydraulic braking force. Moreover, a sum total of the hydraulic braking force and the regenerative braking force can be proportioned to the quantity of operation of the brake operating element.
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Aoki Yasushi
Ishii Yukihisa
Nakamura Iwao
Nonaga Ikuo
Ohba Takeshi
Butler Douglas C.
Honda Giken Kogyo Kabushiki Kaisha
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