Measuring and testing – Simulating operating condition – Marine
Reexamination Certificate
2007-01-30
2007-01-30
McCall, Eric S. (Department: 2855)
Measuring and testing
Simulating operating condition
Marine
Reexamination Certificate
active
11085272
ABSTRACT:
The present invention provides a diagnostic apparatus for an evaporative emission control system which can accurately execute leak diagnosis under a stable condition. An ECU clocks a time td2until the internal pressure value Pteof the evaporative emission control system sealed at the negative pressure reaches the target internal pressure value Pd, sets the pressure change measuring time te2based on the clocking time td2, and measures the pressure change amount P1which varies after the internal pressure value Pteof the evaporative emission control system reaches the target internal pressure value Pdfor a pressure change measuring time te2. Then, the ECU sets the determination value Pth0based at least on the spatial capacity of the evaporative emission control system, and determines whether the evaporative emission control system is normal or abnormal based on the pressure change amount P1.
REFERENCES:
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patent: 6807847 (2004-10-01), Steckler et al.
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Copy of copending U.S. Appl. No. 10/926,296, filed Aug. 26, 2004 entitled “Diagnostic Device of Evaporated Fuel Processing System and the Method Thereof”, and claiming JP 2003-304924.
Copy of copending U.S. Appl. No. 10/926,295, filed Aug. 26, 2004 entitled “Diagnostic Device of Evaporated Fuel Processing System and the Method Thereof”, and claiming JP 2003-304914.
Copy of copending U.S. Appl. No. 11/200,094, filed Aug. 10, 2005, entitled “Diagnostic Apparatus for Evaporative Emission Control System”, and claiming 2004-234648 priority.
Aihara Masaaki
Nakoji Yasushi
Takahashi Daisuke
Fuji Jukogyo Kabushiki Kaisha
Smith , Gambrell & Russell, LLP
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