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US 7,397,210 B2Granted
Control unit for electric power steering apparatus
AssigneesNsk Ltd., NSK Steering Systems Co., Ltd.
InventorsKenji Arai, Yuho Aoki
Life of this patent
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Abstract
In the present invention, only an abnormality of detection of a rotating direction of a motor is detected and therefore, with simple processing and by using a table for judging the abnormality of the detection of a rotating direction of a motor and the rotating direction of the motor, the abnormality of the detection of a rotating direction and the rotating direction of the motor are judged at one time.
Claims4
A control unit for an electric power steering apparatus for applying a steering assist force to a steering system of a vehicle, via a motor, the control unit comprising:
- a plurality of position detecting sensors, each for detecting a rotation position of the motor and outputting it as a binary output;
- a state function calculating means which calculates a state function value repeatedly, at a predetermined time interval, based on outputs of the plurality of position detecting sensors, and which outputs the state function values;
- and
- a judging means which receives the output state function values, and determines and outputs a judgment result;
- wherein the judging means comprises a storage means and a judgment table, which outputs the judgment result;
- and
- wherein the judgment result is one of a clockwise rotation of the motor, a counterclockwise rotation of the motor, a stop of the motor, and an abnormality in the detection of the rotational direction of the motor.
4 more elements
Dependencies are inferred from the claim text.