| 摘要 |
A brake system (10) having a brake booster (12) that is responsive to an operator brake input for providing a first input force to a master cylinder (13) to develop a first brake application and is responsive to a hydraulic input for providing a second input force to a master cylinder (13) to develop a second brake application. An electronic control unit (ECU) (40) receives first input signals from sensors (19) indicative of a speed for each wheel (14,14',18,18') in a brake system of the vehicle. The ECU (40) supplies a pump (42) with an operational input signal when a sensed wheel speed indicates a wheel lock may occur between a wheel and a surface during a brake application and simultaneous activates a decay valve (17) to release pressurized fluid from actuation of the wheel brake associated with the wheel. When the sensed condition is obviated, the ECU (40) supplies a signal to close the decay valve (17) and open a build valve (15) to provide secondary pressurized fluid from a pump (42) to the wheel brake to resume and complete the first brake application. The ECU (40) also receives an input from a pressure sensor (52) associated to with an accumulator (22) and when the fluid pressure in the accumulator (22) is below a preset pressure, the ECU (40) supplies the pump (42) with an actuation signal through which pressurized fluid is developed and communicated to maintain the fluid pressure in the accumulator (22) above the preset pressure. The ECU (40) supplies valves (56,58,34) associated with the accumulator (22) with an input signal to deliver pressurized fluid from the accumulator (22) as the hydraulic input to effect the second brake application.
|
