Method for detecting leaks in a motor vehicle tank ventilation s

Details Method for detecting leaks in a motor vehicle tank ventilation s Method for detecting leaks in a motor vehicle tank ventilation s

1994-09-22

1996-02-13

Williams, Hezron E.

Measuring and testing

With fluid pressure

Leakage

731181, 123520, F02M 3302

Patent

active

054904145

ABSTRACT:
In a method for detecting leaks in a motor vehicle tank ventilation system which includes an adsorption filter connected to the tank, via a ventilation conduit, to the induction pipe of an internal combustion engine via a discharge conduit and to the atmosphere via an air supply conduit, a shut-off valve arranged in the air supply conduit is closed to isolate the system from the atmosphere, a regeneration valve arranged in the discharge conduit is then opened so as to generate in the system a predetermined vacuum up to a point of time at which a stable equilibrium state of the air/fuel ratio in the system is achieved, the regeneration valve is then closed to isolate the system also from the induction pipe, and the vacuum in the system is subsequently maintained over a predetermined period and the existence of a leak in the tank ventilation system is indicated if the vacuum in the system falls below a predetermined threshold value during the predetermined monitoring period.

REFERENCES:
patent: 5146902 (1992-09-01), Cook et al.
patent: 5193512 (1993-03-01), Steinbrenner et al.
patent: 5197442 (1993-03-01), Blumenstock et al.
patent: 5220896 (1993-06-01), Blumenstock et al.
patent: 5239858 (1993-08-01), Rogers et al.
patent: 5267470 (1993-12-01), Cook
patent: 5297527 (1994-03-01), Suzuki et al.
patent: 5315980 (1994-05-01), Otsuka et al.
patent: 5339788 (1994-08-01), Blumenstock et al.
patent: 5398661 (1995-03-01), Denz et al.

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