Measuring and testing – With fluid pressure – Motor part or auxiliary
Reexamination Certificate
2008-09-02
2008-09-02
McCall, Eric S (Department: 2855)
Measuring and testing
With fluid pressure
Motor part or auxiliary
C073S114390
Reexamination Certificate
active
11513191
ABSTRACT:
The invention relates to a method for checking the gastightness of a motor vehicle tank ventilation system consisting essentially of a fuel tank, an adsorption filter, a ventilation line with a pressure sensor, a fresh air line with an adsorption filter check valve (AAV), and a regeneration line with a tank ventilation valve (TEV) to the internal combustion engine. To compensate for the outgassing of fuel, the total diagnosis time tDis formed from the negative pressure buildup time t1and the negative pressure decay time t2as a measure of the tightness of the tank ventilation system and is compared to a corresponding diagnosis time threshold tDS.
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Audi AG
McCall Eric S
Novak Druce & Quigg LLP
LandOfFree
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