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 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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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.
21 Citations
15 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 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. - View Dependent Claims (2, 3, 4, 5)
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6. 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 an abnormality of the power source when it is judged that the filtered voltage is lower than the threshold, wherein the filtering means 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. - View Dependent Claims (7, 8, 9, 10)
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11. 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 an abnormality of the power source when it is judged that the filtered voltage is lower than the threshold, wherein the present voltage is filtered 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. - View Dependent Claims (12, 13, 14, 15)
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Specification