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ONBOARD FRESH AIR PORT CLEANING OF EVAP SYSTEM FOR GTDI VEHICLES

IP.com Disclosure Number: IPCOM000239694D
Publication Date: 2014-Nov-25
Document File: 1 page(s) / 200K

Publishing Venue

The IP.com Prior Art Database

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ONBOARD FRESH AIR PORT CLEANING OF EVAP SYSTEM FOR GTDI VEHICLES

GTDI engines must purge the Evap system canister under vacuum or boost conditions. To facilitate purge under boost, additional hardware is needed (check valves and ejector). The Evap system fresh air line and dust box may become clogged over time from environmental contamination. OEMs have issued recalls due to spiders clogging the Evap system fresh air line.When the Evap system fresh air line is clogged, refueling becomes difficult - as premature shutoffs occur during refueling. Service technicians typically fix a clogged fresh air line by cleaning it with compressed shop air. Onboard diagnostics that detect clogged fresh air lines exist. Typically, as the Evap system is evacuated using engine vacuum during 0.04" leak detection, the final venting of the system is used to determine how restricted the fresh air line is.A typical venting time is about 3 seconds. Strategy establishes a baseline for typical venting times for new engines. When venting times becomes long over time, then it becomes apparent that the fresh air line or dust box are clogged and contaminated with dust, mud, salt, spiders, etc. No onboard method exists to correct a clogged fresh air line.

Method

This method mitigates a clogged fresh air line using an onboard strategy. GTDI engines generate pressure inside the intake manifold when under boost and the pressure is rather intense in magnitude. This method detects a clogged fresh...