Anti-skid brake control system with a feature for deriving targe

Details Anti-skid brake control system with a feature for deriving targe Anti-skid brake control system with a feature for deriving targe

1985-06-05

1988-04-19

Caldwell, Sr., John W.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303109, B60T 866, B60T 870

Patent

active

047384921

ABSTRACT:
An anti-skid brake control system controls braking pressure through one or more skid cycles in which braking pressure is increased and decreased cyclically so as to prevent the vehicle wheels from locking. The system derives a braking pressure decreasing criterion on the basis of variations in wheel speed over the preceding skid cycle. In order to derive the pressure decreasing criterion, an initial wheel speed value is latched and stored when the system first becomes active. At the same time, measurement of elapsed time starts. Subsequently, the wheel speed at the beginning of each skid cycle is latched and compared to the initial wheel speed. On the basis of the difference between the latched values, and the elapsed time, a wheel deceleration rate is derived. The pressure decreasing criterion is then derived on the basis of the wheel speed latched at the beginning of the current skid cycle and the wheel speed deceleration rate and elapsed time since the beginning of the current skid cycle.

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