JPS5517420A - Detector for revolving position for internal combustion engine - Google Patents

Abstract

PURPOSE: To surely avoid the overlap of the reference position and the angular position, by shaping the AC outputs respectivel8 into rectangular waves, taking logic for each rectangular wave, and taking almost the center of the angular position as the reference position.

CONSTITUTION: The AC output of each sensor is shaped into the rectangular waves with the wave shape circuits 60 and 80, and the rectangular waves are taken for logical operation. When the circuit 80 has the output signal depending on the reference information, it inverts if the output signal of the circuit 60 is in leading or trailing. Further, an output signal which is returned at the trailing of the output signal depending on the reference information of the circuit 80 is produced in the logic circuit 70, and the position where the output signal is returned is taken as the reference position. Further, the the leading or trailing in the output signal of the circuit 60 in which the output sgnal of the circuit 70 is not inverted is taken as the angular position and almost the center of angular positions is taken as the reference position. Accordingly, even if the phase relation between the reference position and the angular position is somewhat shifted due to external causes, the overlap of the reference position and the angular position can surely be avoided.

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