Device for coping with sensor abnormal state in electronic control system for internal combustion engine

摘要

A device for coping with a sensor abnormal state in an electronic control system in an internal combustion engine in which a predetermined operation control device is controlled in response to detection signals obtained from various engine sensors. The device includes an engine speed sensor and a temperature sensor. A discriminator determines that the temperature sensor is abnormal when a state, in which engine speed NE is less than a predetermined value nA and concurrently temperature TW is less than a predetermined value TA- DELTA A, continues for a predetermined time tmDT. The detected temperature value TW is corrected to a larger value provisionally to decrease the rotational speed NE of the engine when the abnormal state is indicated.