Patent ID: 6908225
Filing Date: 2005-06-21
Classification: F01P,F02D,G01K,Y02T

Abstract:
1. A failure diagnosing apparatus comprising: a first sensor for detecting a temperature of cooling water of an engine mounted on a vehicle; a second sensor for detecting a temperature associated with the engine; a first calculating means for calculating a first difference between a temperature detected by the first sensor at the time when the engine stops in a previous operating cycle of the engine and a temperature detected by the first sensor at the time when the engine starts in a current operating cycle of the engine; a second calculating means for calculating a second difference between a temperature detected by the second sensor at the time when the engine stops in the previous operating cycle and a temperature detected by the second sensor at the time when the engine starts in the current operating cycle; and a determining means for determining whether the first sensor is faulty based on the first difference and the second difference.