Windshield wiper speed and delay control

Details Windshield wiper speed and delay control Windshield wiper speed and delay control

1992-07-31

1993-10-19

Wysocki, Jonathan

Electricity: motive power systems

Periodic, repetitious or successive operations control of...

318DIG2, 1525013, H02P 100

Patent

active

052549160

ABSTRACT:
A windshield wiper system and method includes a dc motor for connection to drive a windshield wiper. A motor current switch controls current through a field winding of the dc motor. First and second speed selection switches are provided for selecting a speed desired for the windshield wiper. Means responsive to actuation of the first speed selection switch operates the motor current switch to control the current through the field winding of the dc motor for a first duty cycle, and means responsive to actuation of the second speed selection switch operates the motor current switch to control the current through the field winding of the dc motor for a second duty cycle different from the first duty cycle. A delay switch is provided, and a motor drive circuit responsive to a first activation of the switch enables the circuit for operating the motor to drive the windshield wiper once. A circuit responsive to a second activation of the switch enables the motor drive circuit to drive the windshield wiper at intervals determined by a time between the first and second activations of the switch.

REFERENCES:
patent: 4388574 (1983-06-01), Bois et al.
patent: 4435648 (1984-03-01), Goode, III
patent: 4578591 (1986-03-01), Floyd et al.
patent: 4663575 (1987-05-01), Juzswik et al.
patent: 4665488 (1987-05-01), Graham et al.
patent: 4705997 (1987-11-01), Juzswik
patent: 4823058 (1989-04-01), Buchanan, Jr. et al.

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