| 摘要 |
PURPOSE:To reduce the accumulative error to zero and correctly measure the position of a window by adding the motor revolution pulse corresponding to the reverse electromotive voltage to the motor pulse count value in the case when the applied voltage to a motor is turned OFF. CONSTITUTION:When a window is to be lowered, a motor 3 is driven in the direction of the lowering of the window by a manually operated down-switch 7. When the motor 3 starts revolution, pulse signals are sent into a microcomputer 1 from a pulse generator 5. The pulse signals are integration-calculated, and the position of the window is calculated from the integration calculation value. Then, the drive of the motor 3 is suspended by turning OFF the manually operated down-switch 7. If the motor 3 inertia-revolves even after the stop of the motor 3, the reverse electromotive voltage is measured by a reverse electromotive voltage detector 4. The pulse quantity corresponding to the reverse electromotive voltage is added to the/integration calculation value on the stop of the motor 3. By this additional value, the error due to the inertia-revolution of the motor 3 is corrected. |
