Detection signal correction method, motor control device, and electric power steering device
AssigneeNsk Ltd.
InventorsYusuke NISHIOKA, Yoshihiro AOSAKI, Hiroyuki YAMAMURA
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Abstract
A detection signal correction method includes: calculating a rotation angle of a rotation shaft of a motor, based on a detection signal of a sensor; calculating a steering velocity of a steering shaft based on the rotation angle; calculating an error of the detection signal; and correcting the error of the detection signals when the steering velocity is equal to or greater than a steering velocity threshold value and the error of the detection signal is equal to or greater than an error threshold value.
Claims9
A detection signal correction method for correcting a sine signal and a cosine signal, the sine signal and the cosine signal being detection signals output from a sensor depending on rotation of a rotation shaft of a motor providing a steering shaft of a vehicle with steering assist torque, the method comprising:
- calculating a rotation angle of the rotation shaft, based on the detection signals;
- calculating a steering velocity of the steering shaft, based on the rotation angle;
- calculating an error of the detection signals;
- and
- correcting the error of the detection signals when the steering velocity is equal to or greater than a steering velocity threshold value and the error of the detection signals is equal to or greater than an error threshold value.
A motor control device for a motor providing a steering shaft of a vehicle with steering assist torque, comprising:
- a sensor configured to output detection signals including a sine signal and a cosine signal depending on rotation of a rotation shaft of the motor;
- a rotation angle calculation unit configured to calculate a rotation angle of the rotation shaft, based on the detection signals;
- a control unit configured to control the motor, based on the rotation angle;
- a steering velocity calculation unit configured to calculate a steering velocity of the steering shaft, based on the rotation angle;
- an error calculation unit configured to calculate an error of the detection signals;
- and
- a detection signal correction unit configured to correct the error of the detection signals when the steering velocity is equal to or greater than a steering velocity threshold value and the error of the detection signals is equal to or greater than an error threshold value.
Dependencies are inferred from the claim text.