Abstract

An electronic turn signal cancellation apparatus is disclosed which includes two separate rotational positions sensing elements, each sensing an associated identifying portion positioned on a shaft rotated in accordance with vehicle steering wheel rotation. An electronic turn signal cancellation circuit, which may be effectively implemented by a microprocessor, effectively analyzes the output signals of these sensors and determines the current angular shaft position and also the previous shaft position. Turn signal cancellation is implemented by determining current shaft position and the direction of rotation of the shaft. One embodiment implements turn signal cancellation without hysteresis, while a second embodiment utilizes similar structure to implement turn signal cancellation with hysteresis. In each case only two sensors are utilized which may be joined together to form a unitary sensor assembly.