Fault diagnostic apparatus
AssigneeFujitsu Ten Limited
InventorsHideo Yoshida, Takayuki Satou
Life of this patent
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Abstract
A fault diagnostic apparatus enables to improve estimate accuracy of temperature of an object to be examined and to improve fault diagnosis accuracy of a temperature detector for detecting a temperature of the object to be examined. The fault diagnostic apparatus for diagnosing a fault of a water temperature sensor for detecting a temperature of cooling water comprises a fault diagnostic device for diagnosing a fault of the water temperature sensor based on a change in temperature detected by the water temperature sensor in a situation where a parameter to be a chief source of heating the cooling water (such as an engine temperature) decreases.
Claims12
A fault diagnostic apparatus for diagnosing a fault of a temperature detector for detecting a temperature of an object to be examined, comprising:
- a fault diagnostic device for diagnosing a fault of the temperature detector based on a change in temperature detected by the temperature detector in a situation where a parameter of a chief source of heating the object to be examined decreases.
A fault diagnostic apparatus for diagnosing a fault of a temperature detector for detecting a temperature of an object to be examined,
- wherein the object to be examined is mounted on a vehicle, the fault diagnostic apparatus comprising:
- a fault diagnostic device for diagnosing a fault of the temperature detector based on a change in temperature detected by the temperature detector in a situation where a temperature of an internal combustion engine to be a chief source of heating the object to be examined decreases,
- wherein a case of an IG switch being in the off position is judged as being in a situation where the temperature of the internal combustion engine decreases.
Dependencies are inferred from the claim text.