Method for limiting hydraulic assist in a power assist steering

Details Method for limiting hydraulic assist in a power assist steering Method for limiting hydraulic assist in a power assist steering

1998-06-01

2000-06-13

Swann, J. J.

Motor vehicles

Steering gear

With fluid power assist

180446, 701 41, B62D 506

Patent

active

060737212

ABSTRACT:
A method is provided for controlling an electro-hydraulic power assist steering system including a variable-speed electric motor for pumping hydraulic fluid in the system. The method includes monitoring a vehicle steering wheel angle and determining if the vehicle steering wheel angle exceeds a steering travel limit. If the steering travel limit is exceeded, the method reduces a desired motor speed to a predetermined end of travel motor speed until the steering wheel angle drops below the steering travel limit. Accordingly, energy is conserved by reducing the power consumed while the steering system is maintained at its steering travel limit.

REFERENCES:
patent: 4153133 (1979-05-01), Anderson
patent: 5283741 (1994-02-01), Desrus
patent: 5446657 (1995-08-01), Ikeda et al.
patent: 5508919 (1996-04-01), Suzuki et al.
patent: 5711394 (1998-01-01), Fujii et al.
patent: 5761627 (1998-06-01), Seidel et al.
patent: 5762159 (1998-06-01), Matsuoka et al.
patent: 5907277 (1999-05-01), Tokunaga
patent: 5919241 (1999-07-01), Bolourchi et al.

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