Patent ID: 6553304
Filing Date: 2003-04-22
Classification: B60T

Abstract:
A method of operation for a vehicle anti-lock braking system including a driver activated brake pedal and a modulator controlled to initially reduce a braking pressure by a determined initial pressure reduction amount upon detection of an insipient wheel lock condition, the method comprising the steps of:periodically measuring vehicle deceleration and a brake pedal position during activation of the braking system; constructing and periodically updating a brake system characterization table representing a relationship between the measured vehicle deceleration and measured brake pedal position; estimating a road surface coefficient of friction based on the characterization table and changes in the characterization table due to the periodic updating; revising said initial pressure reduction amount based on the estimated road surface coefficient of friction upon detection of the insipient wheel lock condition; periodically determining a brake temperature; and compensating the estimated road surface coefficient of friction for variations in the determined brake temperature.