Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2007-03-29
2010-11-16
Hurley, Kevin (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S417000, C180S422000
Reexamination Certificate
active
07832523
ABSTRACT:
The present invention provides a power assist steering system for use with a motor vehicle utilizing a torque sensor and an electronically controlled hydraulic valve used to supply or meter hydraulic fluid to a hydraulic cylinder that provides power assist to the steering system. The torque sensor measures driver input and provides a signal to the controller that controls an electrically actuated hydraulic valve. Additionally, steering wheel rotational speed and position are also input to the controller wherein the controller generates a steering assist command that minimizes the magnitude of difference, or error, between the steering torque reference value determined from the steering wheel speed and position and the measured torque. By doing so, the invention controls steering wheel feel, as opposed to the conventional practice of controlling the steering assist boost curve.
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Gabel Michael J.
Hung Stephen T.
Laidlaw John Francis
Drouillard Jerome R.
Ford Global Technologies
Hurley Kevin
Owens Frederick
Stabley Michael R
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