Abnormality discriminating method of temperature sensor

Abstract

Abstract PURPOSE:To eliminate an erroneous confirmation of the first stage of starting of an engine, and to always discriminate an abnormality exactly by discriminating whether an output value of a temperature sensor is larger or smaller than a prescribed discriminating value, after a prescribed time in which the engine is capable of warming up enough after starting of the engine has elapsed, and discriminating an abnormality basing on a result of its discrimination. CONSTITUTION:A prescribed temperature TAO is set as a temperature TA of an absorbed air of the inside of a suction pipe 2 by initializing of a controlling circuit 14, and thereafter, whether the first prescribed time t1 has elapsed or not after starting of an engine 3 is discriminated. After the prescribed time t1 has elapsed, an output value VTA of a suction temperature sensor 9 is read, and whether the output value VTA of the suction temperature sensor is larger or smaller than a prescribed discriminating value VTAH is discriminated. In case the output value VTA of the suction temperature sensor 9 is larger than the discriminating value VTAH, whether a state of VTA>VTAH is continued exceeding the second prescribed time t2 or not is discriminated, and when it is continued exceeding the time t2, it is discriminated as an abnormality, it is alarmed and also stored, and thereafter, an F/S (fail safe) action is executed.

Inventors

• 👤 Shunpei Hasegawa
• 👤 俊平 長谷川

Bibliographic Details