Defect diagnosing apparatus of evaporation purge system

Details Defect diagnosing apparatus of evaporation purge system Defect diagnosing apparatus of evaporation purge system

1997-07-16

1998-12-08

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

F02M 3302

Patent

active

058456252

ABSTRACT:
Three-way VSV switches a passage in communication with pressure sensor either to the atmosphere or to three-way VSV. The three-way VSV is provided in bypass passage connecting fuel tank with canister to switch the path to the fuel tank side or to the canister side with respect to tank internal-pressure control valve. As properly switching the three-way VSVs, the pressure sensor can detect both the pressure in the evaporation purge system and the atmospheric pressure. Upon diagnosis of defect a difference is calculated between the in-system pressure and the atmospheric pressure detected, which cancels out the dispersion or the like upon production of the pressure sensor, thus enabling to detect an accurate pressure change.

REFERENCES:
patent: 5220898 (1993-06-01), Kidokoro et al.
patent: 5259353 (1993-11-01), Nakai et al.
patent: 5437256 (1995-08-01), Woletz et al.
patent: 5443051 (1995-08-01), Otsuka
patent: 5590634 (1997-01-01), Shinohara

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