Method and apparatus for feedback-free ABS control

Details Method and apparatus for feedback-free ABS control Method and apparatus for feedback-free ABS control

1990-06-29

1991-05-07

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 92, 303114, 303115, B60T 832, B60T 1312, B60T 1368

Patent

active

050130986

ABSTRACT:
A system for feedback-free ABS control in hydraulic brakes for mobile units, motor vehicles, motorcycles, and the like, equipped with a pedal-actuated master brake cylinder with a hydraulic brake booster and at least one isolation or shutoff valve in the form of a 3/2-way magnetic valve, which in normal operation is supplied with pressure by the master brake cylinder booster and is also assigned a plunger-piston for performing an ABS control. A check valve is disposed in the connecting line between the isolation valve, the ABS magnetic valve and the plunger-piston, or in a common supply line from the dynamic circuit of the master brake cylinder to these three actuating elements, as additional protection for the isolation valve and to assure the required brake pressure, even in the case of a failure, to keep the chambers of the hydraulic isolation valve and the rear chamber of the plunger-piston under pressure and in this way arrest the pistons so that they cannot move during normal braking operation. A pressure control valve can be disposed parallel to the check valve to limit the pressure in case of expansion of the fluid in the chambers, for example, by heating.

REFERENCES:
patent: 4775196 (1988-10-01), Braschel et al.
Bosch Technische Berichte; English Special Edition (Feb. 1980) ISSN0006-79X, pp. 75,76.

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