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Electric power steering system

  • US 4,875,540 A
  • Filed: 06/06/1988
  • Issued: 10/24/1989
  • Est. Priority Date: 06/09/1987
  • Status: Expired due to Term
First Claim
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1. An electric power steering system for a motor vehicle, comprisinga motor operatively connected to a steering system for reducing steering effort,a vehicle speed sensor for producing a vehicle speed signal,a torsion torque sensor provided for detecting torsion torque which is generated in the steering system during a steering operation,assist means responsive to an output signal of the torsion torque sensor for producing an assist signal,driving means responsive to the assist signal for producing a signal for driving the motor,a steering angle sensor provided for detecting steering angle of a steering wheel for producing a steering angle signal,first means responsive to said vehicle speed signal and said steering angle signal for producing a lateral acceleration signal dependent on lateral acceleration exerted on the motor vehicle while said vehicle speed signal is lower than a predetermined value,second means responsive to the lateral acceleration signal for producing a first return torque signal dependent on the lateral acceleration, andthird means for adding the first return torque signal to the assist signal to operate the motor dependent on the first return torque signal via said driving means to return the steering wheel, so as to prevent returning delay of the steering wheel at turning of a corner under high lateral acceleration.

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