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Steering control method and control system for wheeled vehicles

  • US 5,029,660 A
  • Filed: 04/06/1990
  • Issued: 07/09/1991
  • Est. Priority Date: 04/06/1990
  • Status: Expired due to Term
First Claim
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1. In a vehicle steering system including a handwheel, a method for controlling a flow control valve and an electric actuator for operating the valve to control a flow of control fluid in the vehicle steering system, the flow of control fluid being utilized by the system to provide a power assist steering force, the method comprising steps of:

  • generating an initial control signal, the initial control signal being representative of a power steering assist level desired, wherein the improvement comprises;

    generating a feedback signal based on actual current of the electric actuator, said step of generating the feedback signal including steps of measuring the actual current and averaging the measured actual current to obtain an average current signal representative of average current through the actuator; and

    generating a final control signal as a function of the initial control signal and the feedback signal to control the electric actuator as a function of the actual current of the electric actuator to compensate for varying system operating conditions.

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