Failure diagnosis method and failure diagnosis device of...

Details Failure diagnosis method and failure diagnosis device of... Failure diagnosis method and failure diagnosis device of...

2005-11-22

2005-11-22

Noland, Thomas P. (Department: 2856)

Measuring and testing

With fluid pressure

Leakage

Reexamination Certificate

active

06966215

ABSTRACT:
An apparatus detects leak in a fuel vapor treatment system which is referred to as an evaporation system. The apparatus measures a required time T2that is required for decreasing pressure in the evaporation system from P0to P1while opening a base leak hole that provides known amount of leak. Then, a required time T1that is required for decreasing pressure from P0to P1is measured while closing the base leak hole. The apparatus compares the required times T1and T2in order to detect a leak other than the base leak hole. In this process, a specified coefficient that is defined in accordance with the base leak hole is taken into consideration. It is possible to detect the leak of the evaporation system with high accuracy even when the amount of remaining fuel is extremely large.

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