Dual windshield wiper motor synchronization

Details Dual windshield wiper motor synchronization Dual windshield wiper motor synchronization

1992-03-13

1993-06-01

Ro, Bentsu

Electricity: motive power systems

Periodic, repetitious or successive operations control of...

318 41, 318DIG2, B60S 108

Patent

active

052163407

ABSTRACT:
A windshield wiper system has two motors. Each propels its own wiper blade. A blade parking disk is attached to each motor and contains a conductive and a non-conductive segment. Electrical power supplied through the conductive segment to the motor from a "parking contact", is interrupted by the non-conductive segment, parking the blade. During normal operation, the voltage change on the "parking contact" is sensed for each motor to determine if one motor is faster than the other. If the speed difference exceeds a set level, power to the faster motor is interrupted for a preset time interval during each rotation of the parking disk, until the difference is less than the set level. The voltage on the parking contact is also sensed for the higher voltage produced if the motors are operating at high speed. If the motors are operating at high speed, the preset time interval is increased and the allowable speed difference is reduced.

REFERENCES:
patent: 3721878 (1973-03-01), Gumbert
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patent: 4665488 (1987-05-01), Graham et al.
patent: 4670695 (1987-06-01), Licata et al.
patent: 4881019 (1989-11-01), Shiraishi et al.
patent: 4900995 (1990-02-01), Wainwright
patent: 4900996 (1990-02-01), Wainwright

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