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HEATED CARBON CANISTER DIAGNOSTIC UTILIZING TEMPERATURE SENSOR

IP.com Disclosure Number: IPCOM000237773D
Publication Date: 2014-Jul-10
Document File: 1 page(s) / 218K

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The IP.com Prior Art Database

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HEATED CARBON CANISTER DIAGNOSTIC UTILIZING TEMPERATURE SENSOR

Vehicles sold in North America contain a carbon canister that adsorbs refueling, diurnal and running loss vapors. Engine running manifold vacuum is used to desorb the vapor from the activated carbon canister via opening of CPV valve. Desorbed vapors are combusted in engine. This is commonly known as "purging".The canister's ability to adsorb fuel vapors is enhanced at cooler temperatures.The canister's ability to desorb fuel vapors is enhanced at hotter temperatures. Future Tier III regulations call for less Evaporative emissions during shed testing. A major source of bleed emissions during shed testing are HC that are trapped inside the canister.To address Tier III regulations, OEMs are exploring usage of heated canisters. One such canister is made by Delphi and has a heating element inside it.Because the canister is part of the Evap system, diagnostics on its heating function may be required.

Method

This method centers around utilizing a temperature sensor inside the purge line between the canister and the purge valve to measure the temperature of the purge flow entering the intake manifold once the heater is activated.While a temperature sensor inside the canister itself could yield results, its readings become confounded with the cooling that takes place inside the canister during purging. With canister heater commanded on, the purge air temperature is measured to infer that the heater is fu...