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Controller and control method for an electric power steering apparatus

  • US 7,016,775 B2
  • Filed: 12/10/2002
  • Issued: 03/21/2006
  • Est. Priority Date: 12/11/2001
  • Status: Expired due to Fees
First Claim
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1. A controller for controlling an electric motor which provides assist power corresponding to steering operation for an electric power steering apparatus, comprising:

  • a detecting device configured to detect present voltage of a power source for the electric motor;

    a filtering device configured to filter the present voltage based on at least one time-constant;

    a judging device configured to judge whether the filtered voltage is lower than a predetermined threshold; and

    a determining device configured to determine an abnormality of the power source when it is judged that the filtered voltage is lower than the threshold,wherein the filtering device filters the present voltage based on a first time-constant when the voltage of the power source increases and based on a second time-constant when the voltage of the power source decreases.

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