Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1995-09-27
1998-02-10
Poon, Peter M.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
303152, 188156, B60T 1374
Patent
active
057161089
ABSTRACT:
A braking force control system of an electric vehicle includes a regenerative-controllable motor for driving driven wheels, wheel cylinders for braking non-driven wheels, respectively, and a master cylinder connected to a brake pedal for producing a master cylinder pressure in proportion to a depression amount of the brake pedal. A mechanical braking force control unit is further provided in a working fluid passage from the master cylinder and the wheel cylinders. The mechanical braking force control unit includes a proportioning valve and a free-piston cylinder arranged in parallel with each other in the working fluid passage. The proportioning valve is operated to output a wheel cylinder pressure to the wheel cylinders when the depression amount of the brake pedal is no more than a given value. On the other hand, the free-piston cylinder is operated to output a wheel cylinder pressure to the wheel cylinders when the depression amount of the brake pedal is more than the given value. A motor control unit is further provided to perform a regenerative control of the motor for achieving a regenerative braking force which is equal to a difference between a target total braking force derived based on the depression amount of the brake pedal and a mechanical braking force derived based on the wheel cylinder pressure outputted from the mechanical braking force control unit.
REFERENCES:
patent: 4671577 (1987-06-01), Woods
patent: 5294191 (1994-03-01), Giorgetti et al.
patent: 5378053 (1995-01-01), Patient et al.
patent: 5573312 (1996-11-01), Muller et al.
Asa Hironori
Gotoh Tomoyuki
Takeda Kenji
Nippon Soken Inc.
Poon Peter M.
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