Method and apparatus for checking the tightness of a tank-ventin

Details Method and apparatus for checking the tightness of a tank-ventin Method and apparatus for checking the tightness of a tank-ventin

1994-05-20

1995-10-24

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

054601410

ABSTRACT:
The invention is directed to a method for checking the tightness of a tank-venting system when a pregiven test condition is satisfied. The method includes the steps of: (a) building up a difference pressure in the tank-venting system irrespective of whether the pregiven test condition is satisfied; (b) determining the presence of the test condition and then closing the tank-venting system; (c) determining the value of the decay gradient of the difference pressure when the pregiven test condition is satisfied thereby losing no time in starting the check of the tightness; and, (d) drawing a conclusion as to the tightness of the tank-venting system when the value of the decay gradient is less in magnitude than a threshold decay gradient. In this way, as soon as the test condition is satisfied, a determination of the value of the decay gradient of the difference pressure already built up can be started. An apparatus for carrying out the method is also disclosed.

REFERENCES:
patent: 5195498 (1993-03-01), Siebler
patent: 5197442 (1993-03-01), Blumenstock
patent: 5261379 (1993-11-01), Lipinski
patent: 5265577 (1993-11-01), Denz et al.
patent: 5275144 (1994-01-01), Gross
patent: 5295472 (1994-03-01), Otsuka
patent: 5339788 (1994-08-01), Blumenstock

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