Positive pressure canister purge system integrity confirmation

Details Positive pressure canister purge system integrity confirmation Positive pressure canister purge system integrity confirmation

1993-02-03

1995-05-02

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

054110041

ABSTRACT:
The tank/canister volume's integrity against unacceptable leakage measured 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 at a regulated pressure. Failure to build tank pressure to a predetermined pressure within a predetermined time indicates a gross leak. If no gross leak exists, the pressure will build, and the time required to build to a given pressure from the start pressure provides a measurement of any leakage that may be present. The fuel fill level in the tank affects this time, and it is taken into account in the measurement.

REFERENCES:
patent: 5022364 (1991-06-01), Phillips
patent: 5048493 (1991-09-01), Orzel
patent: 5143035 (1992-09-01), Kayanuma
patent: 5146902 (1992-09-01), Cook
patent: 5191870 (1993-03-01), Cook
patent: 5212979 (1993-05-01), Albrodt
patent: 5220822 (1993-06-01), Tuma
patent: 5230319 (1993-07-01), Otsuka

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