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NON INTEGRATED REFUELING ONLY EVAPORATIVE EMISSIONS SYSTEM

IP.com Disclosure Number: IPCOM000249646D
Publication Date: 2017-Mar-13
Document File: 1 page(s) / 189K

Publishing Venue

The IP.com Prior Art Database

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 70% of the total text.

NON INTEGRATED REFUELING ONLY EVAPORATIVE EMISSIONS SYSTEM

Current Plug-in Hybrid Electric Vehicles (HEVs) commonly use a Non-Integrated Refueling Canister Only System (NIRCOS) for the evaporative emission subsystem to meet federal and state emission requirements. This consists of NIRCOS steel fuel tank, fuel tank isolation valve, carbon canister, leak check module, vapor lines, and a vent to atmosphere. The fuel tank must be rigid/high strength to withstand diurnal temperature pressures and thus made of materials with additional structural baffles, towers, or improved materials in order to accommodate the pressures and vacuums the fuel tank will endure while being sealed off from the outside environment. Also, Plug-in HEVs use an electronic leak check module, which has a sole function to check for leaks in the evaporative emissions system. An evaporative emissions sub system has the function to store and manage fuel vapors that are generated during refueling, diurnal temperature changes, and when other sources of energy are put into the fuel.

Method

The subsystem consists of a non-NIRCOS fuel tank that has a compressor connected to a storage vessel strong

enough to hold compressed fuel vapor and air mixture. The fuel compressor runs with the refueling valve open,

before and during a refueling event to capture all of the refueling vapors and stores them under pressure phase

in the fuel vapor storage vessel. Method is similar to the carbon canister storage, but it is not vent...