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Control unit for electric power steering apparatus

  • US 7,500,538 B2
  • Filed: 04/15/2005
  • Issued: 03/10/2009
  • Est. Priority Date: 04/30/2004
  • Status: Expired due to Fees
First Claim
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1. A control unit for an electric power steering apparatus including a steering angle sensor for detecting a steering angle of a steering shaft and being controlled to apply a steering assist force by a motor to a steering system of a vehicle, the control unit comprising:

  • a plurality of position detection sensors for outputting binary values according to a rotation position of the motor;

    a relative steering angle detecting means for detecting a relative steering angle of the steering shaft from binary outputs of the position detection sensors; and

    an abnormality determining means for determining that the steering angle sensor or the relative steering angle detecting means is abnormal when a difference between a change amount of the steering angle and a change amount of the relative steering angle is greater than a predetermined value to output an abnormality signal.

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