Wiper apparatus and a method for controlling the wiper apparatus

Details Wiper apparatus and a method for controlling the wiper apparatus Wiper apparatus and a method for controlling the wiper apparatus

1999-04-13

2000-12-05

Ip, Paul

Electricity: motive power systems

Periodic, repetitious or successive operations control of...

318444, 318 41, 318DIG2, B60S 108, H02P 552

Patent

active

061571547

ABSTRACT:
In a wiper apparatus for carrying out wiping motion with use of rotational drive of a motor, reverse rotation due to the application of external force on the wiper blade is positively detected. In response to the detection result, the motion of the motor and the wiper blade is controlled. The detection of the reverse rotation is carried our such that two kinds of periodic signals are generated depending on the rotation direction of the drive shaft, and the phase relationship between the periodic signals are arranged to differ depending on the rotation direction, and then the rotation direction is detected from the phase relationship. The wiper apparatus may be an opposing type wiper apparatus having a pair of wiper blades, and control operation of the wiper blades may be arranged such that the position taken by the wiper blade is detected by counting a number of pulses which are generated in association with the rotation of the drive shaft of the motor. If the wiper apparatus has such arrangement, the pulse count counted during reverse rotation of the drive shaft of the motor is subtracted from the pulse count counted during right rotation of the drive shaft of the motor, whereby the position taken by the wiper blade is accurately determined.

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patent: 5256950 (1993-10-01), Matsumoto et al.
patent: 5568026 (1996-10-01), Welch

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