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EVAP SYSTEM PLUGGED FRESH AIR LINE MONITOR FOR EU AND ROW VEHICLES

IP.com Disclosure Number: IPCOM000241461D
Publication Date: 2015-May-01
Document File: 1 page(s) / 230K

Publishing Venue

The IP.com Prior Art Database

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EVAP SYSTEM PLUGGED FRESH AIR LINE MONITOR FOR EU AND ROW VEHICLES

Vehicles sold in NA (North America) market must absorb running loss, diurnal and refueling vapors in a carbon canister to meet EPA emission standards. Vehicles sold in EU/ROW (Rest of World) must absorb running loss, and diurnal vapors only in a carbon canister to meet EU emission standards. EU refueling vapors are recovered offboard through a special dispensing nozzle that has a boot. Engine running vacuum is used to desorb the fuel vapors and combust them in engine. EU/ ROW vehicles have an Evap system, however, they are not required to perform OBDII diagnostics on it as required in the NA market. If the fresh air line is clogged with dirt, salt or spiders, presently there is no way of knowing this in EU / ROW vehicles since there is no FTPT sensor or diagnostics in the Evap system to measure restrictions. Present EU strategy continues to purge the canister even though no flow is going across it. In the meantime, the fuel tank may be subjected to considerable vacuum with a plugged fresh air line. Also, emissions levels are increased and customers may smell fuel odor in the cabin as the canister is not being purged.

Method

This new system infers a plugged fresh air line in EU/ROW vehicles using a surrogate sensor. The fuel tank may have a liquid fuel temperature sensor for engine controls purposes. Liquid fuel typically warms up during driving from heat generated by fuel pump operation, plus hea...