Rotation detection device
AssigneeDenso Corporation
InventorsTakahiro Suzuki, Masaya Taki, Toshihiro Fujita, Nobuyori Nakajima
Life of this patent
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Abstract
An electric power steering apparatus has a rotation detection device for calculating an absolute angle that includes a sensor section that detects a rotation of a motor and outputs a mechanical angle and a count value. The rotation detection device also includes a signal acquisition unit that obtains the mechanical angle and the count value from the sensor section, and an absolute angle calculator that calculates an absolute angle based on the mechanical angle and the count value. Where one rotation of the motor is divided into indefinite regions and definite regions, the absolute angle calculator uses the count value from the definite regions to calculate the absolute angle.
Claims8
A rotation detection device comprising:
- a sensor section configured to detect a rotation of a motor and to output first rotation information that includes a rotation angle of the motor within one rotation of the motor and second rotation information that includes a number of rotations of the motor;
- and
- a control section including:
- a signal acquirer configured to acquire the first rotation information and the second rotation information from the sensor section;
- and
- an absolute angle calculator configured to calculate an absolute angle indicative of a rotation amount from a reference position based on the first rotation information and the second rotation information;
- wherein
- the one rotation of the motor is divided into an indefinite region and a definite region, wherein the indefinite region is a region in which a detection deviation of the second rotation information occurs, and wherein the definite region is a region in which no detection deviation of the second rotation information occurs, and wherein
- the absolute angle calculator is further configured to calculate the absolute angle using the second rotation information from the definite region.
An electric power steering apparatus comprising:
- a rotation detection device;
- and
- a motor for outputting a steering torque for a steering operation of a vehicle, wherein
- the rotation detection device includes:
- a sensor section configured to detect a rotation of the motor and to output first rotation information that includes a rotation angle of the motor within one rotation of the motor and second rotation information that includes a number of rotations of the motor;
- and
- a control section including:
- a signal acquirer configured to acquire the first rotation information and the second rotation information from the sensor section;
- and
- an absolute angle calculator configured to calculate an absolute angle indicative of a rotation amount from a reference position based on the first rotation information and the second rotation information;
- wherein
- the one rotation of the motor is divided into an indefinite region and a definite region, wherein the indefinite region is a region in which a detection deviation of the second rotation information occurs, and wherein the definite region is a region in which no detection deviation of the second rotation information occurs, and wherein
- the absolute angle calculator is further configured to calculate the absolute angle using the second rotation information from the definite region.
Dependencies are inferred from the claim text.