Abs variant nominal hold pressure

Details Abs variant nominal hold pressure Abs variant nominal hold pressure

B - Operations, Transporting

60

T

341/73

B60T 8/78 (2006.01) B60T 8/1761 (2006.01) B60T 8/42 (2006.01)

Patent

CA 2008777

ABS VARIANT NOMINAL HOLD PRESSURE Abstract of the Disclosure A brake control system is described that maximizes the braking efficiency of an under-damped actuator, such as a motor-driven linear screw. When an incipient lock condition is detected, the system determines the optimal brake pressure, relieves brake pressure and measures the duration of the pressure release. When the wheel is approaching recovery, but has not yet substantially recovered, the system holds brake pressure constant at a value calculated to represent the amount of pressure remaining at the wheel brake. This calculated hold value is based upon the measured optimal pressure and the measured release duration, and allows the wheel to continue to reaccelerate towards recovery while preventing unnecessary pressure relief. Once the wheel recovers, the system reapplies brake pressure to a substantial fraction of the optimal pressure without over-exciting the actuator and over-shooting the desired pressure.

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