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A PLUGGED EVAP CANISTER FRESH AIR PORT DIAGNOSTIC USING CVS CURRENT FEEDBACK

IP.com Disclosure Number: IPCOM000240458D
Publication Date: 2015-Jan-30
Document File: 1 page(s) / 237K

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The IP.com Prior Art Database

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A PLUGGED EVAP CANISTER FRESH AIR PORT DIAGNOSTIC USING CVS CURRENT FEEDBACK

An Evap system's fresh air port brings in air during purging operation to dislodge trapped fuel vapors and clean out the canister. A typical purging operation with engine running involves opening the Canister Purge Valve (CPV) to suck in fresh air and displace canister vapor. Vapors are combusted in the engine. A fresh air port also serves another role during refueling. It facilitates a flow path for vapors to enter the canister and displace air molecules. Air molecules are expelled via the fresh air port.If the fresh air port is plugged, then purging cannot occur. Furthermore, refueling cannot occur easily and the customer has to trickle fill the fuel tank.Dirt, salt, and spiders can clog the fresh air port.During refueling with a clogged fresh air line, premature refueling shutoff events occur. Premature shutoff (PSO) events contribute to company TGW metrics and consumer dissatisfaction when refueling. Besides a clogged fresh air line, a stuck Canister Vent Solenoid (CVS) can also cause PSOs at the pump. Present state Evap diagnostics sets DTC P1450 if vacuum is trapped inside the Evap system and is unable to vent to atmosphere with the CVS commanded open. DTC P1450 main root causes are: 1) clogged fresh air line, or 2) a mechanically stuck closed CVS valve. Present state diagnostic is unable to distinguish between them.

Method

Our new method enhances Evap diagnostics to be able to...