Gm Global Technolgoy Operations, Inc.

Delco Electronics Corporation

Jerry J Queen, Ii

Kevin S Kidston

Eric Edward Krueger

Alan J Lee

Jeannine C Eddy

Jeffrey T Von Der Vellen

A vehicle antilock brake system provides an adaptive apply bump period at the beginning of the apply phase of a antilock brake pressure cycle that provides rapid recovery of the correct amount of pressure for all braking conditions. The apply bump period is established based upon the wheel acceleration and the peak acceleration attained by the wheel during recovery from an incipient wheel lock condition. In particular, the apply bump is initiated when recovery from an incipient wheel lock condition is first sensed and thereafter terminated when the wheel acceleration decreases to below a threshold value that is a predetermined function of the peak acceleration of the wheel during recovery from an incipient wheel lock condition in the ABS pressure cycle.

Antilock brake system with closed loop apply bump

An antilock brake controller provides an adaptive pressure hold period that interrupts the release of brake pressure during the pressure release phase of an antilock braking pressure control cycle of a vehicle wheel by holding the brake pressure constant while the wheel slip rate is below a threshold that is adjusted as a predetermined function of wheel slip for the front wheels and as a predetermined function of wheel acceleration for the rear wheels.

Antilock brake system with closed loop control of hold during release

Growing community of inventors

Brighton, MI, United States of America

Jerry J Queen, Ii