Patent ID: 6249098
Filing Date: 2001-06-19
Classification: B60S,Y10S

Abstract:
A wiper control apparatus comprising:a wiper motor for driving a wiper blade reciprocally between an upper reversing position and a lower reversing position;a drive circuit for driving the wiper motor in forward and reverse directions;wiper position detecting means for detecting an arrival of the wiper blade at a predetermined pre-reversing position defined inside of at least one of the upper reversing position and the lower reversing position;motor rotation detecting means for producing rotation pulses in response to rotation of the wiper motor to detect a rotational position of the wiper motor;control means for counting the number of pulses produced after a detection of the arrival of the wiper blade at the pre-reversing position, and commanding the drive circuit to reverse the rotation of the wiper motor when the counted number reaches a predetermined number,wherein the wiper motor is rotated continuously in the forward and reverse directions by a repetition of reversing of the rotation of the wiper motor, wherein:the wiper position detecting means is for further detecting an arrival of the wiper blade at an allowable limit position defined at an outside of the reversing position; andthe control means is for further commanding the drive circuit to reverse the rotation of the wiper motor, when the arrival of the wiper blade at the allowable limit before the counted number reaches the predetermined number.