| The Chinese market has become the largest automotive market in the world.However,Chinese automotive emission control requirement is much lower than that in North American market.With the issue of Beijing VI emission consultation paper,Chinese emission requirement is intended to be aligned with that in North American.In this case,automotive emission control technology shall also be improved to match the regulation requirement,as currently BQ gasoline vehicle can only meet China V evaporative pollutant emission requirement.This article analyzed each component of fuel system,and found out the factors that effects evaporative emission.Then an improved design solution was presented to BQ vehicle fuel system to meet a lower evaporative emission.The main work is listed as bellow:1.A numerical simulation model for fuel tank is built to predict the fuel hydrocarbon permeation as well as the barrier layer thickness optimization for multilayer plastic fuel tank.The diffusion model is based on Fick’s laws of diffusion for a steady/unsteady state permeation regime through a multilayer polymeric wall under isothermal condition.The thickness optimization will provide a good emission performance as well as economic efficiency.2.Co-injected design for inlet check valve is recommended as it can reduce less evaporative emission by extending the permeation path and reduce permeation area compared with traditional design.3.This article illustrates the importance of ORVR’s(short for Onboard Refueling Vapor Recovery)application to reduce emission for refueling.And to enlarge the efficiency of ORVR system,the sub-component such as fuel filler pipe,canister,vapor lines are analyzed for an optimizing match.4.Internal layout design for roll over valve is recommended as it won’t destroy the barrier layer of the fuel tank shell,hence it will have better emission performance.At last,vehicle test is performed on improved BQ fuel system,which confirmed the feasibility and effectiveness of the improved design. |
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