Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1993-01-27
1994-03-29
Cross, E. Rollins
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3302
Patent
active
052975290
ABSTRACT:
The tank/canister volume's integrity against unacceptable leakage is either confirmed or denied by a diagnostic test performed by an on-board diagnostic system which includes an electrically operated air pump and tank-mounted analog pressure transducer. At the beginning of a test, the engine management computer closes the canister purge solenoid valve and operates the pump to begin pressurization of the tank/canister volume. The pumped air is introduced via the canister's atmospheric vent port so that the pressurizing air is entrained with fuel vapors previously collected in, but not yet purged from, the canister. Failure to build to a predetermined pressure within a predetermined time indicates a gross leak. Upon attainment of the predetermined pressure, the pump is shut off. If the pressure drops by more than a certain amount during the test, integrity is denied. If not, integrity is confirmed.
REFERENCES:
patent: 5021071 (1991-06-01), Reddy
patent: 5143035 (1992-09-01), Kayanuma
patent: 5146902 (1992-09-01), Cook et al.
patent: 5191870 (1993-03-01), Cook
patent: 5193512 (1993-03-01), Steinbrenner et al.
patent: 5197442 (1993-03-01), Blumenstock et al.
Busato Murray F.
Cook John E.
Boller George L.
Cross E. Rollins
Moulis Thomas N.
Siemens Automotive Limited
Wells Russel C.
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