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

1992-04-28

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303116SP, 303 87, B60T 842

Patent

active

051081601

ABSTRACT:
In a hydraulic brake system for feedback-free ABS control for mobile units, motor vehicles, motorcycles and the like, it is proposed that partial hydraulic units be provided in accordance with the number of desired closed and optionally also open brake circuits, and that the actuating piston of each shutoff valve provided in each partial hydraulic unit and interrupting the communication between the master brake cylinder and the associated wheel brake cylinder and simultaneously opening the communication between the wheel brake cylinder and a plunger-piston, with a pressure equalization face, which is acted upon in parallel with the pressure from the master brake cylinder line. As a result, given suitable embodiment and adaptation of the remaining pressure faces of the actuating piston, a pressure equilibrium is obtained in the sense of compensation for the working pressures exerted. It then becomes possible to embody the triggering pressure for the actuating piston in the shutoff valve independently of the pressure in the master brake cylinder, and to derive it for instance from a high-pressure pump, which starts at the onset of ABS control, without further modification.

REFERENCES:
patent: 3994538 (1976-11-01), Farr
patent: 4072366 (1978-02-01), Kondo
patent: 4422695 (1983-12-01), Farr
patent: 4428624 (1984-01-01), Farr
patent: 4938541 (1990-07-01), Shaw et al.
Bosch Technische Berichte [Technical Reports]7 (1980), pp. 75 and 76.

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