Monitoring of fuel vapor pressure

Fuel vapor in a fuel tank ( 1 ) is purged into an intake passage ( 8 ) of an engine ( 10 ) through a purge vent ( 2, 4, 6 ). The controller ( 21 ) determines whether a leak is present in a purge vent from the fuel tank ( 1 ) to a purge control valve ( 11 ). The determination process comprises a pull...

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Bibliographic Details
Main Authors KOBAYASHI MASATO, TSUYUKI TAKESHI, ISHII HIROYA, ARAMAKI TAKASHI
Format Patent
LanguageEnglish
Published 03.05.2005
Edition7
Subjects
BLASTING
COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF
WEAPONS
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Summary:Fuel vapor in a fuel tank ( 1 ) is purged into an intake passage ( 8 ) of an engine ( 10 ) through a purge vent ( 2, 4, 6 ). The controller ( 21 ) determines whether a leak is present in a purge vent from the fuel tank ( 1 ) to a purge control valve ( 11 ). The determination process comprises a pull-down process in which a pressure in the purge vent is reduced using a negative pressure in the intake passage ( 8 ) and a leak-down process of sealing the purge vent at the reduced pressure and monitoring the pressure variation. The controller ( 21 ) calculates an error equivalence amount (DVPII), a pressure component corresponding to sloshing in the fuel tank ( 1 ) during the leak-down process, and determines the presence of a leak in a highly accurate manner based a corrected pressure (DVP 5 A) in which the monitored pressure variation is corrected using the error equivalence amount (DVPII) (S 22 ).
Bibliography:Application Number: US20030642622