| 摘要 |
<p>The method and system for controllably restricting the on time of a pump (32) of an electro-hydraulic control system for a hydraulic brake system by modelling the amount of hydraulic brake fluid in a low pressure accumulator (LPA) of the hydraulic brake system. Sensors (24) sense wheel speed of their respective wheels (20) of a vehicle. Control valves (34, 36), including isolation and dump valves, together with the pump (32), vary the amount of brake fluid in the LPA. A control unit (26) electrically coupled to the pump (32), the control valves (34, 36) and the wheel speed sensors (24), initially detects an electro-hydraulic control event based on the sensed wheel speeds and then activates the control valves (34, 36) and pump (32) which vary the amount of brake fluid in the LPA. The control unit (26) models the amount of brake fluid in the LPA during the activation and controls the state of the pump (32) based on the modelled amount of brake fluid in the LPA. The modelled amount of brake fluid in the LPA consequently is based on the on time of the pump (32) and the total on time of all of the dump valves (34, 36) in the electro-hydraulic control system.</p> |
