ABS variant nominal hold pressure

Details ABS variant nominal hold pressure ABS variant nominal hold pressure

1989-03-13

1990-04-17

Kashnikow, Andres

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303103, 303DIG4, 303115, B60T 858, B60T 860

Patent

active

049174452

ABSTRACT:
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.

REFERENCES:
patent: 3953083 (1976-04-01), Latvala et al.
patent: 4111497 (1978-09-01), Carp et al.
patent: 4209203 (1980-06-01), Brearley
patent: 4647115 (1987-03-01), Leiber et al.
patent: 4664453 (1987-05-01), Kade et al.
patent: 4741580 (1988-05-01), Matsubura et al.
patent: 4749239 (1988-06-01), Onogi et al.

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