Method and system for damping wheel speed oscillation on vehicle

Details Method and system for damping wheel speed oscillation on vehicle Method and system for damping wheel speed oscillation on vehicle

1994-12-13

1996-10-22

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Pressure reapply control

303163, 303164, 303185, B60T 874

Patent

active

055670245

ABSTRACT:
A method and system for damping wheel speed oscillation during an anti-lock braking event. The method includes the initial step of sensing the wheel speed and determining a wheel slip based on the sensed wheel speed and a vehicle speed reference. Next, the method continues with the step of determining whether the wheel slip has exceeded a predetermined slip threshold. If the wheel slip has not exceeded a predetermined slip threshold, the method performs normal or unmodified anti-lock brake control. If the wheel slip has exceeded the predetermined slip threshold, the method continues with the step of determining whether an acceleration feedback condition representative of a high mu surface has been satisfied. If an acceleration feedback condition has been satisfied, the method continues with the step of increasing brake pressure applied to the wheel from a steady-state level in a step-wise function during acceleration of the wheel before the wheel speed reaches the vehicle speed reference. The brake pressure is applied as a function of the wheel acceleration. If an acceleration feedback condition has not been satisfied, the method applies normal anti-lock brake control.

REFERENCES:
patent: 3637264 (1972-01-01), Leiber et al.

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