Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1990-10-31
1992-07-21
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303115PP, 303111, 303DIG6, B60T 832
Patent
active
051317290
ABSTRACT:
A known vehicle brake system having four wheel brakes, belonging to two brake circuits, for four wheels has an anti-skid apparatus with two electrically controllable brake pressure modulators, two wheel rotation sensors, and two brake pressure adaptors. The wheel rotation sensors are assigned to one front wheel and one diagonally opposed rear wheel, and each controls one brake pressure modulator, which belongs to the same wheel as the wheel rotation sensor. The brake pressure of a wheel brake located on the same axle on the opposite side of the vehicle is also controlled by a brake pressure modulator via a brake pressure adaptor. If only one wheel rotation sensor is provided per axle, only the wheel associated directly with the wheel rotation sensor can be braked optimally. The other wheel on the same axle may be overbraked or underbraked. This interferes with controllability of the vehicle and/or may have the disadvantage of overly long stopping distances. In the novel vehicle brake system, each of the two wheel rotation sensors is assigned to a separate front wheel and controls one brake pressure modulator for its respective front wheel. The two rear wheel brakes are each coupled via a brake pressure adaptor to the brake pressure modulator on the same side. A pressure reduction for the right front wheel that is effected in anti-skid operation results in a pressure reduction in the same direction for the right rear wheel.
REFERENCES:
patent: 3980346 (1976-09-01), Leiber
patent: 4033637 (1977-07-01), Leiber
patent: 4491919 (1985-11-01), Leiber
patent: 4593955 (1986-06-01), Leiber
patent: 4600244 (1986-07-01), Leiber
patent: 4758053 (1988-07-01), Yasuno
patent: 4861114 (1989-08-01), Takata
patent: 4943123 (1990-07-01), Takeda et al.
Graham Matthew C.
Greigg Edwin E.
Greigg Ronald E.
Poon Peter M.
Robert & Bosch GmbH
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