Positive pressure canister purge system integrity confirmation

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

F - Mech Eng,Light,Heat,Weapons

02

M

F02M 25/08 (2006.01)

Patent

CA 2153038

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 (24) and tank-mounted analog pressure transducer (28). At the beginning of a test, the engine management computer (22) closes the canister purge solenoid valve (12) and operates the pump to begin pressurization of the tank/canister volume. The pumped air is introduced via the canister's atmospheric vent port (14V) 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.

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