Control circuit for variable-speed windshield wiper

Details Control circuit for variable-speed windshield wiper Control circuit for variable-speed windshield wiper

1981-04-30

1983-06-14

Weldon, Ulysses

Electricity: motive power systems

Periodic, repetitious or successive operations control of...

318444, H02P 104

Patent

active

043885748

ABSTRACT:
A windshield wiper is operated by a wiper motor from an electric source, with a control circuit operating the motor. This control circuit has a continuous-wipe switch which when closed operates the wiper continuously. A discontinuous-wipe switch can be closed to start an oscillator, with this oscillator connected to a backward counter which counts backwardly synchronously with the oscillator. A comparator compares the instantaneous numerical output of the counter with a fixed numerical output generated by a settable memory, and operates the wiper briefly when the two outputs agree. A set switch is connected to the memory and can reset it so that when this set switch is operated the fixed numerical output of the memory is fixed at the instantaneous numerical output of the counter, thereby setting the interval between successive wipes of the wiper. This set switch may also operated the windshield washer, with appropriate circuits being used so that a short actuation of the set switch resets the memory but a long actuation operates the windshield washer.

REFERENCES:
patent: 3919613 (1975-11-01), Steinmann

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