Hydraulic brake system with reversible pump for traction control

Details Hydraulic brake system with reversible pump for traction control Hydraulic brake system with reversible pump for traction control

1990-06-22

1991-11-12

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303110, 303115EC, B60T 850, B60T 1320

Patent

active

050642545

ABSTRACT:
A brake system including an apparatus for limiting drive slip at drivable vehicle wheels by feeding brake pressure into wheel brakes associated with these vehicle wheels. The brake pressure is generated in a pressure modulator having a spring-loaded stepped piston including a primary piston. The primary piston can be acted upon by pressure fuid from a supply container by a motor which drives a pump. A secondary piston of the stepped piston effects the brake pressure and feeds it via a valve assembly into a brake line extending between the master brake cylinder of the brake system and a wheel brake. The brake pressure can be diminished by controlling the drive motor of the pump. The pump is embodied with reversible pumping directions, and the pressure fluid flows through it both during a working stroke and a return stroke of the stepped piston. The valve assembly is actuatable by the stepped piston as a function of the position thereof. The apparatus uses the pump drive alone in order to generate brake pressure, and uses the position of the stepped piston to actuate the valve assembly. This makes it possible to dispense with magnetic valves.

REFERENCES:
patent: 4082369 (1978-04-01), Black et al.
patent: 4129342 (1978-12-01), Sato et al.
patent: 4175794 (1979-11-01), Pauwels
patent: 4457563 (1984-07-01), Farr
patent: 4575161 (1986-03-01), Vanzant et al.
patent: 4927213 (1990-05-01), Burgdore
patent: 4986612 (1991-01-01), Arikawa

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