| 摘要 |
PURPOSE: To certainly detect the position of a moving body such as a window glass by a method wherein ripple waveform of a driving motor is detected, on the basis of, and the revolution speed of a motor is measured on the decision. CONSTITUTION: The value of parameter corresponding to driving torque of a driving motor 7 is detected by a parameter detecting means comprising a driving electric current detecting means 12. Then, thresholds for detecting ripple waveforms are set one by one, on the basis of the values of detections. In normal operations where the value of driving electric current and driving torque are small, the ripple waveforms are detected, on the basis of the thresholds that are set at small values. In special operations where the driving electric current and the driving torque are large, the ripple waveforms are detected, on the basis of the thresholds that are set at large values. Thereby, noises are not erroneously detected as ripple waveforms, and the ripple waveforms can be detected quickly and correctly. |
