Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2008-08-15
2010-12-14
Morris, Lesley (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S419000, C180S420000, C180S421000, C180S422000, C180S423000, C137S625640, C137S625230, C137S625430
Reexamination Certificate
active
07849956
ABSTRACT:
A method of steering a vehicle with a hydraulic steering system is disclosed. A first control signal is sent to a pilot valve. The pilot valve is operated to direct pilot fluid to a main valve in response to the first control signal. The main valve is opened to a first position in response to the pilot fluid. Fluid is directed through the main valve to a first actuator. Resistance to actuation of the first actuator is detected. The detected resistance is compared to a threshold resistance. A second control signal is sent to the pilot valve when the detected resistance exceeds the threshold resistance. The pilot valve is operated to direct pilot fluid to the main valve in response to the second control signal. The main valve is opened to a second position in response to the pilot fluid. Fluid is directed through the main valve to the first actuator and a second actuator.
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Huang Xiaodong
Khalil Rabie E.
Krone John James
Mientus Michael J.
Caterpillar Inc
Finnegan, Henderson, Farabow, Garrett & Dunner LLC
Morris Lesley
Stabley Michael R
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