Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1987-11-05
1990-01-02
Kashnikow, Andres
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 92, 303116, B60T 842, B60T 888
Patent
active
048908916
ABSTRACT:
An antilock brake system includes a pressure modulator having a step piston. The smaller step defines a primary chamber connected to the wheel brake and the larger piston step defines a driving pressure space that is alternatively connected to the high pressure output of an auxiliary pressure source or to its unpressurized storage reservoir by a control valve. By the admission of pressure to the driving pressure space, the modulator piston, against the restoring force of a strong restoring spring, is forced into its initial position corresponding to the minimum volume of the primary chamber. For a pressure reduction phase, the driving pressure space is connected with the storage reservoir of the auxiliary pressure source, so that, under the combined effect of the brake pressure in the primary chamber and of the restoring spring, the piston moves to expand the volume of the primary chamber. The pressure buildup phases are controlled by the readmission of the output pressure of the auxiliary pressure source to the driving pressure space. The maximum volume expansion of the primary pressure space is smaller than the brake fluid volume that, during a braking taking place with maximum actuating force, can be displaced into the wheel brakes. This avoids the brake unit from becoming "controlled empty" in the case of very low adhesion coefficients between the road and the vehicle wheels.
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patent: 4775196 (1988-10-01), Braschel et al.
ALB Anti-Blockier-System Honda Deutschland GmbH, 1983.
Daimler-Benz Aktiengesellschaft
Kashnikow Andres
Newholm Timothy
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