Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2007-08-29
2008-10-14
Morris, Lesley D. (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S421000, C701S041000
Reexamination Certificate
active
07434654
ABSTRACT:
A power steering system for a vehicle includes a hydraulic system for controlling resistance of a steering wheel. A valve of the hydraulic system is connected to a coil which varies positioning of the valve. A method for controlling the resistance of the steering wheel includes turning the steerable wheels of the vehicle in response to rotation of the steering wheel. The angle of the steering wheel and the speed of the vehicle are sensed and inputted into a controller. A lateral acceleration is determined based on the sensed signals by the controller. A recommended current rate of the coil is determined based on the lateral acceleration. An adjustment to the recommended current rate of the coil is determined based upon the speed of the vehicle. The recommended current rate is also modified based upon the adjustment. The modified current rate of the coil is then applied to the coil to vary the stiffness of the valve, which in turn varies the resistance to turning the steerable wheels of the vehicle.
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Amberkar Sanket S.
Birsching Joel E.
Weiss Scott E.
Delphi Technologies Inc.
Morris Lesley D.
Scharich Marc A.
Smith Michael D.
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