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POWER STEERING DEVICE

  • US 20160001815A1
  • Filed: 01/20/2014
  • Published: 01/07/2016
  • Est. Priority Date: 03/21/2013
  • Status: Active Grant
First Claim
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1. A power steering apparatus comprising:

  • a steering mechanism formed of an iron-series metallic material and which steers steerable wheels in accordance with a steering operation of a steering wheel;

    an electrically driven motor which provides a steering force for the steering mechanism;

    a speed reduction mechanism formed of the iron-series metallic material, interposed between the steering mechanism and the electrically driven motor, and which transmits a revolution force of the electrically driven motor to the steering mechanism;

    a torque sensor which detects a steering torque generated in the steering mechanism;

    a control unit which calculates a motor command current drivingly controlling the electrically driven motor on a basis of the steering torque and outputs the motor command current to the electrically driven motor;

    a steering load average value calculating circuit installed in the control unit and which calculates an average value of a steering load corresponding value which corresponds to any one of the steering torque within a predetermined interval of time, the motor command current, and a motor actual current actually flowing through the electrically driven motor; and

    an abnormality detection circuit installed in the control unit, which compares the average value of the steering load corresponding value with a specified value stored in the control unit, and detects an abnormality of the apparatus when the average value is larger than the specified value.

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