Sweep control apparatus for windshield wipers

Abstract

A sweeping apparatus such as a control system for windshield wipers includes a regulating means which generates a electrical control signal for three separate wiper control means or "paths". Each path includes a differential stage followed by a motor control strage, for controlling a motor having a driven shaft on which a digital coder is mounted. The magnitude of the output signal of the latter is processed in a feedback loop by a processing circuit and passed to the input differential stage. The outputs of the various differential stages are applied to respective comparators. The latter transmit a blocking signal via a NO or OR gate, to the regulating means when the input signal to the comparator exceeds a predetermined threshold value. The invention is especially applicable to automotive windshield wiper systems.

Dependencies are inferred from the claim text.