A hydraulic-power steering system is provided. A power-steering valve controls and varies a level of steering assist. A magnetic actuator varies torsional stiffness of the valve to change torque and produce a sufficient amount of the torque to generate full assist. A first valve is operatively connected to a steering pump and allows the full assist at a relatively low steering torque and through which flow from the steering pump is directed. A second valve is operatively connected to the steering pump. Current is applied to a solenoid valve that allows an increasing amount of the flow to be directed through the second valve in response to an input signal of increasing vehicle speed above a threshold value and closes in response to a signal identifying any of a plurality of advanced steering functions.


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    Title :

    Hydraulic-power steering system with magnetic torque overlay


    Contributors:

    Publication date :

    2015-07-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge



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