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A METHOD TO PERFORM OFFBOARD PURGING FOR PHEV VEHICLES

IP.com Disclosure Number: IPCOM000241418D
Publication Date: 2015-Apr-24
Document File: 1 page(s) / 259K

Publishing Venue

The IP.com Prior Art Database

Abstract

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This is the abbreviated version, containing approximately 58% of the total text.

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A METHOD TO PERFORM OFFBOARD PURGING FOR PHEV VEHICLES

Vehicles sold in North America market are required to adsorb refueling, diurnal and running loss vapors in a carbon canister. PHEV vehicles have a sealed fuel tank. This is due to limited engine run time, which constrains cleaning the canister. PHEV Evap system is called NIRCOS (Non Integrated Refueling Canister Only System). Hydrocarbon (HC) Vapors from running loss and diurnal temperature cycle must be contained inside the sealed fuel tank. The canister in a PHEV is designed to adsorb refueling vapors only. The FTIV valve is normally closed and the fuel tank is made of heavy steel to withstand the intense pressures and vacuum builds from diurnal temperature cycle inside the sealed tank. Purging occurs based on opportunity. If the engine turns on to recharge the battery or if A/C or heat is demanded, then purging occurs. However, a loaded canister cannot force the engine to turn on as this would be a big fuel penalty hit.If a driver refuels and loads the canister with hydrocarbon (HC) and then drives in battery mode and parks the car in the sun for prolonged time, HC could escape into the atmosphere from the Evap system fresh air port. This is called breakthrough and is undesirable.

Method

This method performs canister purging using an offboard purging station. PHEV are designed to be plugged into a charging station via a tether. Customers routinely plug their vehicles into designated charging stations. It...