Gm Global Technolgoy Operations, Inc.

Steve J Eckert

Mutasim A Salman

Nader M Boustany

A hierarchical brake controller is described having two control levels, a high level supervisory controller and a low local controller. The supervisory controller receives a vehicle deceleration rate command from the vehicle operator and determines a commanded brake line pressure value to establish the actual vehicle deceleration at the operator commanded rate. The supervisory controller then proportions the commanded brake line pressure between the front and rear brakes based on a determined proportioning factor. The local controller at each wheel functions to establish the respective commanded front or rear brake line pressure. In addition, the local controller for each of the rear brake limits the applied brake pressure in response to a sensed incipient wheel lockup condition to prevent lockup of the braked wheel. The local controller for a rear brake that is limiting brake pressure to prevent a lockup condition provides a maximum allowable rear brake pressure value to the supervisory controller. The supervisory controller then limits the commanded brake line pressure and therefore the commanded front brake line pressure to values based on the maximum allowable rear brake pressure and the proportioning value between the front and rear brakes.

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Troy, MI, United States of America

Steve J Eckert