Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1988-09-02
1989-07-25
Halvosa, George E. A.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
303 971, 303100, 303108, B60T 1300
Patent
active
048506508
ABSTRACT:
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.
REFERENCES:
patent: 3475059 (1969-10-01), Klein
patent: 4760893 (1988-08-01), Sigl et al.
patent: 4768840 (1988-09-01), Sullivan et al.
Boustany Nader M.
Eckert Steve J.
Salman Mutasim A.
Conkey Howard N.
General Motors Corporation
Graham Matthew C.
Halvosa George E. A.
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