Method for checking the operability of a tank-venting system

Details Method for checking the operability of a tank-venting system Method for checking the operability of a tank-venting system

1999-03-05

2000-10-17

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

061315508

ABSTRACT:
The invention is directed to a method for checking the operability of a tank-venting system of a motor vehicle. The tank-venting system includes a tank, an adsorption filter and a tank-venting valve. The adsorption filter has a venting line and is connected to the tank via a connecting line. The tank-venting valve is connected to the adsorption filter via a valve line. In the method, a pressure source introduces a pressure into the tank-venting system which is an overpressure compared to atmospheric pressure and the pressure source has at least one operating variable. A first time-dependent trace of the one variable is provided and this trace is characteristic for a diagnostic trace undisturbed by a tanking operation. A second time-dependent trace of the one variable is detected during standstill of the vehicle and is compared to the first time-dependent trace. An output of a fault announcement is inhibited when the second time-dependent trace deviates from the first time-dependent trace by a pregiven value.

REFERENCES:
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patent: 5349935 (1994-09-01), Mezger
patent: 5383437 (1995-01-01), Cook
patent: 5460141 (1995-10-01), Denz
patent: 5499614 (1996-03-01), Busato
patent: 5553577 (1996-09-01), Denz
patent: 5685279 (1997-11-01), Bloomquist
patent: 5715799 (1998-02-01), Bloomquist
patent: 5967124 (1999-10-01), Cook

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