Hydraulic pressure control device for use in vehicle anti-skid b

Details Hydraulic pressure control device for use in vehicle anti-skid b Hydraulic pressure control device for use in vehicle anti-skid b

1985-03-22

1987-01-13

Reger, Duane A.

Fluid-pressure and analogous brake systems

Pipeless valves

303116, B60T 802

Patent

active

046360093

ABSTRACT:
A hydraulic pressure control device in a vehicle anti-skid braking system includes a wheel brake actuating cylinder for braking a vehicle wheel, a fluid pressure supply passage connected between a master cylinder and the wheel brake actuating cylinder and having a restriction, and a first directional control valve disposed in the fluid pressure supply passage and having at least pressure-increasing and pressure-decreasing modes, the first directional control valve being normally in the pressure-increasing mode to connect the master cylinder to the fluid pressure supply passage. A second directional control valve is connected between the master cylinder and the wheel brake actuating cylinder, the second directional control valve being normally open to provide a bypass passage across the first directional control valve to connect the master cylinder passage to the wheel brake actuating cylinder. A control unit is responsive to a decelerating condition of the vehicle wheel for actuating the first directional control valve into the pressure-decreasing mode and for actuating the second directional control valve to shut off the bypass passage.

REFERENCES:
patent: 3549212 (1970-12-01), Leiber
patent: 3948568 (1976-04-01), Leiber
patent: 4090739 (1978-05-01), Iio
patent: 4099793 (1978-07-01), Iio

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