Method and apparatus for providing variable assist power steerin

Details Method and apparatus for providing variable assist power steerin Method and apparatus for providing variable assist power steerin

1999-01-05

2000-12-26

Cuchlinski, Jr., William A.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle subsystem or accessory control

180422, B62D 5065

Patent

active

06167334&

ABSTRACT:
A variable assist power steering system (10) uses vehicle speed, steering wheel rate and steering valve inlet pressure to vary the steering assist provided. A control module (30) receives vehicle speed, steering wheel rate and pressure data from sensors (24, 25, 26) and produces a control signal for a flow control valve actuator (32) that bypasses fluid flow from the pump (22) to a reservoir (36), rather than to the steering valve (20) thereby affecting steering valve pressure which controls the rack piston (16) which changes the angle of the front vehicle wheels used for steering. The control module (30) employs first and second calibration tables (38, 40) to determine the control signal that ensures adequate flow while consuming the least amount of energy.

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