Controller and control method for an electric power steering apparatus
First Claim
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 being abnormality of the power source when it is judged that the filtered voltage is lower than the threshold.
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Abstract
A controller controls an electric motor to provide assist power corresponding to steering operation for an electric power steering apparatus. The controller comprises a detecting device, a filtering device, a judging device and a determining device. The detecting device detects present voltage of a power source for the electric motor. The filtering device filters the present voltage based on a small time-constant when the voltage of the power source increases and based on a large time-constant when the voltage of the power source decreases. The judging device judges whether the filtered voltage is lower than a predetermined threshold. And, the determining device determines being abnormality of the power source when it is judged that the filtered voltage is lower than the threshold.
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Citations
18 Claims
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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:
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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 being abnormality of the power source when it is judged that the filtered voltage is lower than the threshold. - View Dependent Claims (2, 3, 4, 5, 6, 12)
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7. A controller for controlling an electric motor which provides assist power corresponding to steering operation for an electric power steering apparatus, comprising:
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detecting means for detecting present voltage of a power source for the electric motor;
filtering means for filtering the present voltage based on at least one time-constant;
judging means for judging whether the filtered voltage is lower than a predetermined threshold; and
determining means for determining being abnormality of the power source when it is judged that the filtered voltage is lower than the threshold. - View Dependent Claims (8, 9, 10, 11)
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13. A control method for controlling an electric motor which provides assist power corresponding to steering operation for an electric power steering apparatus, comprising:
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detecting present voltage of a power source for the electric motor;
filtering the present voltage based on at least one time-constant;
judging whether the filtered voltage is lower than a predetermined threshold; and
determining being abnormality of the power source when it is judged that the filtered voltage is lower than the threshold. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification