Method and arrangement for diagnosing a tank-venting system of a

Details Method and arrangement for diagnosing a tank-venting system of a Method and arrangement for diagnosing a tank-venting system of a

1994-02-10

1994-10-11

Cross, E. Rollins

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

053537718

ABSTRACT:
The invention relates to a method and an arrangement for diagnosing a tank-venting system of a motor vehicle wherein a pregiven underpressure is adjusted in the tank-venting system in order to determine if the system is tight. Then, a check is made to determine at which gradient this underpressure decays when the tank-venting system is completely closed. The system is evaluated as being leaky when the underpressure decays more rapidly than corresponding to a pregiven threshold. To arrive at the pregiven underpressure, much more vapor must be pumped from the system for an empty tank than for a full tank. The pulse-duty factor for opening the tank-venting valve on the system is made to vary in dependence upon the fill level of the tank in order that pumping does not take place too rapidly or too intensely for a full tank and not too long for an almost-empty tank. The dependency on the fill level of the tank is varied in that the valve for a tank which is almost full is driven with a low pulse-duty factor in order to obtain only a small vapor throughput; whereas, for a tank which is almost full, a very large pulse-duty factor is selected.

REFERENCES:
patent: 5193512 (1993-03-01), Steinbrenner et al.
patent: 5237979 (1993-08-01), Hyodo et al.
patent: 5261379 (1993-11-01), Lipinski et al.
patent: 5265577 (1993-11-01), Denz et al.
patent: 5297528 (1994-03-01), Mukai
patent: 5297529 (1994-03-01), Cook et al.

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