ABS proportional valve capable of remaining open while the wheel

Details ABS proportional valve capable of remaining open while the wheel ABS proportional valve capable of remaining open while the wheel

1991-07-03

1993-11-16

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 11, 3031192, 303DIG4, 13759617, 25112902, B60T 836

Patent

active

052617319

ABSTRACT:
In a braking pressure control apparatus for a vehicle, a first valve connected between a hydraulic pressure source and a wheel cylinder serves to permit and inhibit a supply of brake fluid to the wheel cylinder from the hydraulic pressure source. A second valve connected between the wheel cylinder and a reservoir serves to permit and inhibit an escape of the brake fluid from the wheel cylinder toward the reservoir. A control device serves to output control signals to the first and second valves respectively to control the braking pressure in the wheel cylinder in response to a detected running condition of the vehicle. The control device includes a deciding section for deciding whether or not a small variation in the braking pressure in the wheel cylinder should be done on the basis of the detected running condition of the vehicle, and an outputting section for, when the deciding section decides that the small variation in the braking pressure in the wheel cylinder should be done, simultaneously outputting the control signals to the first and second valves to simultaneously execute the supply of the brake fluid to the wheel cylinder and the escape of the brake fluid from the wheel cylinder.

REFERENCES:
patent: 3402972 (1968-09-01), Cooper et al.
patent: 4715666 (1987-12-01), Farr
patent: 4842343 (1989-06-01), Akiyoshi et al.
patent: 4898434 (1990-02-01), Kohno et al.
patent: 4915459 (1990-04-01), Hashida
patent: 4919497 (1990-04-01), Kaes
patent: 5076538 (1991-12-01), Mohr et al.

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