Method and device for detecting fault

Abstract

Abstract PURPOSE: To detect faults in a couple of sensor, having a prescribed relation, rapidly and securely, by monitoring the states of their two output signals by turns. CONSTITUTION: Every time eight pulse detection signals S2 are outputted from one sensor, one pulse detection signal S9 is outputted from the other sensor. The pulse signal S9 presets a counter 27 to eight, and the pulse signal S2 permits the counter 27 to go down and also sets an R-S flip-flop (FF)29; when eight pulse signals S2 are not outputted, a following pulse S9 holds the R-S.FF32 set. When the generation of the pulse S9 is stopped, the presetting operation of the counter 27 is not performed, so an R-S.FF34 is set when the counter 27 goes up to eight. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Kyoichi Fujimori
• 👤 Hidekazu Oshizawa

Bibliographic Details