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Fluid flow control apparatus for a power steering system

  • US 4,691,797 A
  • Filed: 07/10/1986
  • Issued: 09/08/1987
  • Est. Priority Date: 07/10/1986
  • Status: Expired due to Fees
First Claim
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1. An apparatus for controlling fluid flow from a hydraulic pump to a hydraulic power steering mechanism, said apparatus comprising:

  • orifice means, through which fluid from the pump flows to the steering mechanism, for generating a hydraulic control signal proportional to the fluid flow rate through said orifice means;

    flow control valve means for bypassing fluid flow away from the steering mechanism in response to said hydraulic control signal; and

    control means for modifying said hydraulic control signal including a pilot fluid circuit between the pump and said orifice means and a solenoid operated valve means in said pilot fluid circuit and operable in response to a secondary control signal.

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