Method and arrangement for conducting a tank-venting diagnosis i

Details Method and arrangement for conducting a tank-venting diagnosis i Method and arrangement for conducting a tank-venting diagnosis i

1993-05-11

1994-08-23

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302, F02B 7700

Patent

active

053397886

ABSTRACT:
The invention is directed to a method and an arrangement for making a tank-venting diagnosis for a motor vehicle. The underpressure in a tank-venting apparatus is measured and tank venting is inhibited when a determination is made that a test condition is satisfied according to which a check is made as to whether a threshold underpressure is exceeded during a tank-venting phase. The method ensures that a tank-venting apparatus will not be damaged by an underpressure which is too high and which can occur when the venting arrangement of the adsorption filter of the apparatus is blocked or when a shutoff valve of the venting arrangement no longer opens.

REFERENCES:
patent: 4949695 (1990-08-01), Uranishi
patent: 4962744 (1990-10-01), Uranishi et al.
patent: 5186153 (1993-02-01), Steinbrenner et al.
patent: 5193512 (1993-03-01), Steinbrenner et al.
patent: 5220896 (1993-06-01), Blumenstock
patent: 5230319 (1993-07-01), Otsuka

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