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Control device for electric power steering apparatus

  • US 6,681,165 B2
  • Filed: 09/25/2001
  • Issued: 01/20/2004
  • Est. Priority Date: 09/25/2000
  • Status: Active Grant
First Claim
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1. A control device, of an electric power steering system, for controlling a motor for applying a steering assist force to a steering mechanism, the control device comprising:

  • a steering assist command value operating section comprising a means for calculating a steering assist command value, based on;

    a steering torque generated in a steering shaft; and

    an approximation functional expression, which is stored in said steering assist command value operating section, wherein said approximation functional expression is one in which a one-step derived function is continuous; and

    a current control section comprising a means for calculating a current control value, based on;

    a current value of the motor for applying a steering assist force to a steering mechanism;

    said steering assist command value; and

    a gain curve, which at least partially possess a gradient exceeding a predetermined value.

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