Method and system for low-to-split mu detection and control for

Details Method and system for low-to-split mu detection and control for Method and system for low-to-split mu detection and control for

1993-07-30

1994-10-25

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303111, 36442601, B60T 884

Patent

active

053583191

ABSTRACT:
A method and system for modifying anti-lock brake control to a vehicle braking on a surface having a low-mu to split-mu transition. The time duration of the apply stage of an anti-lock brake system cycle is measured for the two front wheels. The measured apply stage durations are compared to a threshold. The braking coefficients of the two front wheels are qualified based on these comparisons. Each wheel is qualified as normal-duration if the apply stage duration is less than the threshold, and long-duration if the apply stage duration is greater than the threshold. Normal low-mu pressure control is continued if both front wheels are qualified as normal-duration. Split-mu pressure control is activated when exactly one of the front wheels is qualified as long-duration. The split-mu pressure control restricts the rate of brake pressure applied to the long-duration wheel. Low-mu to high-mu pressure control is utilized when both wheels are qualified as long-duration.

REFERENCES:
patent: 4005910 (1977-02-01), Leiber et al.
patent: 4313166 (1982-01-01), Rode et al.
patent: 4349876 (1982-09-01), Lindermann
patent: 4859002 (1989-08-01), Yoshino
patent: 5123715 (1992-06-01), Okubo
patent: 5224766 (1993-07-01), Oikawa et al.

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