초록 ▼

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

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.

대표청구항 ▼

A system for controlling the brake pressure applied to the brakes of the front and rear wheels of a vehicle, the system comprising in combination: means for generating a brake pressure command value Pc in accord with an operator commanded braking value; means for generating a front brake pressure co

A system for controlling the brake pressure applied to the brakes of the front and rear wheels of a vehicle, the system comprising in combination: means for generating a brake pressure command value Pc in accord with an operator commanded braking value; means for generating a front brake pressure command Pcf having a value Y*Pc where Y is a desired front-to-rear proportioning brake pressure ratio; means for generating a rear brake pressure command Pcr having a value (1-Y)Pc; front brake pressure control means for controlling the brake pressure applied to each of the front wheel brakes to the value Pcf; rear brake pressure control means, the rear brake pressure control means including means for controlling the brake pressure applied to each of the rear wheel brakes to the lesser of the value Pcr or a value Prm determined to prevent a rear wheel lock-up condition; and means for limiting the brake pressure command value Pc to a maximum value Pcm having a value (1/(1-Y))Prm, whereby the front brake pressure command Pcf is limited to a value preventing front wheel lock-up based on the rear brake pressure value Prm determined to prevent a rear wheel lock-up.