Fuel vapor treatment system with leak diagnosing

A fuel vapor purge system is configured to execute a highly accurate leak diagnosis with respect to a fuel vapor leak. After the engine is stopped, the temperature of the fuel vapor rises temporarily and then decreases until it reaches the outside ambient temperature. During this period, the purge l...

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Bibliographic Details
Main Authors TSUYUKI TAKESHI, ISHII HIROYA, HAYASHI TAKANE
Format Patent
LanguageEnglish
Published 29.06.2006
Subjects
MEASURING
PHYSICS
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
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Summary:A fuel vapor purge system is configured to execute a highly accurate leak diagnosis with respect to a fuel vapor leak. After the engine is stopped, the temperature of the fuel vapor rises temporarily and then decreases until it reaches the outside ambient temperature. During this period, the purge line is closed off and a purge line pressure decreasing rate is detected when the purge line pressure is slightly above atmospheric pressure. The detected purge line pressure decreasing rate is then compared to a threshold value. The purge system is diagnosed as "normal" if the purge line pressure decreasing rate is equal to or larger than the threshold value and as "leaking" if the purge line pressure decreasing rate is less than the threshold value.
Bibliography:Application Number: US20050261488