Patent ID: 7818997
Filing Date: 2010-10-26
Classification: F02D,G01K

Abstract:
1. An abnormality diagnostic device for an intake air temperature sensor that detects a temperature of an air taken into an intake pipe of an internal combustion engine that is mounted in a vehicle, comprising: a second temperature sensor that is provided in the vehicle and that detects a temperature that serves as an index of a change in the temperature of an intake air; and a control device that compares a lowest temperature of the intake air detected via the intake air temperature sensor in a period from a startup of the internal combustion engine until a trend of the change in the temperature of the air taken into the internal combustion engine becomes stable with a detected temperature provided via the second temperature sensor, and that diagnoses presence/absence of abnormality of the intake air temperature sensor based on a magnitude of deviation between the lowest temperature detected via the intake air temperature sensor and the detected temperature provided via the second temperature sensor.