Method and system for controlling brake pressure under low Mu br

Details Method and system for controlling brake pressure under low Mu br Method and system for controlling brake pressure under low Mu br

1992-04-29

1994-07-12

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303103, 303109, 303110, B60T 858

Patent

active

053282540

ABSTRACT:
Method and system for reducing the brake pressure rise rate under low Mu braking surface conditions by utilizing a vehicle reference speed to determine if the wheels are being over-braked. When over-braking occurs, the pressure rise rate is restricted by not allowing an ABS valve to go into an Apply state (approximately 100 psi/sec.), regardless of wheel acceleration levels. A Ramp state is used in place of the Apply state and the pressure rise is therefore limited to approximately 30 psi/sec. to improve wheel control. The Ramp duty cycle is also modified to provide the smallest pressure steps possible with the current valve hardware.

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