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EVAP SYSTEM CANISTER ANTI TAMPERING MONITOR

IP.com Disclosure Number: IPCOM000246916D
Publication Date: 2016-Jul-14
Document File: 1 page(s) / 195K

Publishing Venue

The IP.com Prior Art Database

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 68% of the total text.

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EVAP SYSTEM CANISTER ANTI TAMPERING MONITOR

Vehicles sold in North America must adsorb refueling, running loss and diurnal vapors in a carbon canister. Carbon has a property of easily absorbing hydrocarbons (HC). During engine running conditions, the canister is purged of HC by allowing fresh air to enter the canister and dislodge HC. CPV valve opens up and engine vacuum is used to pull in fresh air across the canister. The HC are combusted in the cylinders. Canisters age over time and can get contaminants inside them whereby they will no longer adsorb hydrocarbons (HC). Water ingestion or liquid fuel carryover can degrade the carbon bed. The telltale that canister is clogged and damaged is inability to refuel. When attempting to refuel with a bad canister, whether a main canister or a bleed canister, Pre mature shutoffs occur at the dispensing pump. (PSO). Customers at this point may choose to 1) replace the canister with a new one (proper action) or 2) to disconnect the connection to the canister and leave the canister in place or 3) simply remove the canister and add a straight tube without replacing the canister (tampering action). Lines are cheaper than canisters and some vehicles have multiple series canisters which makes replacement costly.

Method

This method infers the lack of a canister by measuring the lag between two existing pressure sensors - Fuel Tank Pressure Transducer & Evap Leak Check Monitor Presure Sensor (FTPT and ELCM PS) - after a vacuum e...