Method and system for controllably restricting the on time of a

Details Method and system for controllably restricting the on time of a Method and system for controllably restricting the on time of a

1995-04-05

1996-06-04

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

With pump

3031161, 3031191, B60T 1316

Patent

active

055226507

ABSTRACT:
The method and system for controllably restricting the on time of a pump of an electro-hydraulic control system for a hydraulic brake system by modeling the amount of hydraulic brake fluid in a low pressure accumulator (LPA) of the hydraulic brake system. Sensors sense wheel speed of their respective wheels of a vehicle. Control valves, including isolation and dump valves, together with the pump, vary the amount of brake fluid in the LPA. A control unit electrically coupled to the pump, the control valves and the wheel speed sensors, initially detects an electro-hydraulic control event based on the sensed wheel speeds and then activates the control valves and pump which vary the amount of brake fluid in the LPA. The control unit models the amount of brake fluid in the LPA during the activation and controls the state of the pump based on the modeled amount of brake fluid in the LPA. The modeled amount of brake fluid in the LPA consequently is based on the on time of the pump and the total on time of all of the dump valves in the electro-hydraulic control system.

REFERENCES:
patent: 4892364 (1990-01-01), Burgdorf
patent: 5113345 (1992-05-01), Mine et al.
patent: 5388894 (1995-02-01), Holland et al.

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