Anti-skid vehicle braking systems

Details Anti-skid vehicle braking systems Anti-skid vehicle braking systems

1978-10-30

1980-07-01

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303119, B60T 802

Patent

active

042103703

ABSTRACT:
In a fluid-pressure operated anti-skid braking system operation of a brake applying relay valve is controlled by application pressure in an application chamber. A memory chamber is connected to the application chamber through a one-way valve and a restrictor permits pressure in the memory chamber to decay into the application chamber when the pressure in the application chamber reduces at a skid point. Application pressure is supplied to the application chamber through a normally open latch valve. Re-application of the brakes following a skid is controlled by closure of the latch valve which permits only a restricted flow of application pressure into the application chamber. This is sufficient to re-apply the brakes rapidly in a first stage until the pressure in the application chamber becomes equal to that of the decayed pressure in the memory chamber. Brake-application then continues at a slower rate in a second stage since the restricted flow of control pressure has also to increase the pressure in the memory chamber. This continues until the latch valve re-opens so that the brakes are re-applied in a third stage at an original application pressure.

REFERENCES:
patent: 3823987 (1974-07-01), Kurichh
patent: 3902764 (1975-09-01), Sebo
patent: 3929383 (1975-12-01), Urban et al.
patent: 3950035 (1976-04-01), Tribe

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