Rear window wiper motor control

Claim 1

In an windshield wiper system having a current-controlled electric motor for driving windshield wipers through repeating wiping cycles by reversing the direction of rotation of the motor through a reversing switch comprising a pair of relays which control the polarity of current applied to the motor, the improvement therewith comprising: a limit switch mechanically coupled to said motor for detecting the end positions of said motor and for providing input signals indicative of said end positions; and, first and second time delay circuits each having an output respectively coupled to one of said relays and each of said delay circuits having a pair of inputs coupled to said limit switch, the first input of each delay circuit being responsive to respective ones of said input signals to activate the output of the delay circuit after a predetermined delay period and the second input of each delay circuit being responsive to respective ones of said input signals to deactivate the output of the delay circuit upon the application of an input signal, with the first input of the first delay circuit and the second input of the second delay circuit being responsive to a first one of said input signals provided by said limit switch when said limit switch detects a first end position of said motor, and with the first input of the second delay circuit and the second input of the first delay circuit being responsive to a second one of said input signals provided by said limit switch when said limit switch detects the other end position of said motor.