The Characteristics And Emission Reduction Effect Of Carbon From Light Vehicles Of National 6 Standard In Fuzhou City Based On Portable Emission Measurement System(PEMS)

Motor vehicle exhaust emissions have gradually caused serious environmental pollution problems.Among the measures to control motor vehicle exhaust emissions,continuously improving motor vehicle emission standards is also one of the important emission reduction measures.At present,my country’s motor vehicle emission standards have entered the sixth stage,and there is still a lack of research on the emission laws of vehicle pollutants according to the China 6 emission standards.Since the standard test in the laboratory cannot accurately reflect the emission of motor vehicles on the actual road,this paper builds the SEMTECH-ECOSTAR vehicle exhaust test platform,and selects light vehicles that meet the China 6 emission standards for testing on the actual roads of Fuzhou City.The characteristics of driving conditions under actual road traffic conditions,the analysis of the carbon emission characteristics of vehicles running on actual roads,and the localization of the MOVES model to simulate and predict the carbon emission factors of light vehicles in Fuzhou City,and construct it based on measured data The micro-carbon emission prediction model of light-duty vehicles on the actual roads of Fuzhou City under the China 6 emission standard was developed,and the accuracy of the constructed model was verified to compare the applicability of the two models.Combining the carbon emission characteristics of light-duty vehicles under the China 3-China 5emission standards,the carbon emission reduction effect of the vehicle pollutant control strategy is analyzed from the micro,meso,and macro levels.The main findings are as follows:1.The carbonemissionrate oflight-dutyvehicles inthe China6 emission standard increases with the increase of speed.The emission rates of pollutants CO₂,CO,and HC are 0.786～3.266g/s,1.218×10^-4～5.442×10^-4g/s,respectively Between6.068×10^-6～2.565×10^-6g/s;the vehiclecarbonemissionfactor basically decreases with the increase of the instantaneous speed of the vehicle,and the emission intensity of pollutants CO₂,CO,HC are respectively 0～2000g/km,0～0.1g/km,0～0.07g/km,but the vehicle carbon emission factor and the vehicle speed Pearson correlation coefficient square（R²）are all lower than 0.5;the carbon emission rate in each driving state The size is:uniform speed>ac-celeration>deceleration>idling speed,the vehicle carbon emission factorgenerally shows a trend of increasing with the increase of acceleration,and has limited correlation with acceleration;vehicles are prone to high carbon emission factors in the low speed acceleration zone;vehicle carbon The emission factor basically increases with the increase of VSP.When theVSP-Bin is in the interval[-10,10]kw/t,the change of the vehicle carbon emission factor has obvious regularity.2.After localizing the MOVES model,the Fuzhou light vehicle carbon emission factor simulation prediction effect obtained based on operating conditions is good,but there is still a certain difference between the predicted value and the actual measured value;then based on the on-board test carbon emission data,Established a polynomial regression model based on the VSP China 6 emission standard light vehicle carbon emission rate,the model R²is greater than 0.8,P value is less than 0.05,and all passed the F test.Based on the vehicle carbon emission micro-prediction model established by VSP,the error rate between the predicted value and the actual measured value does not exceed the set error rate range（30%,15%,25%）.Therefore,comparing the prediction effects of the two models,it is known that the micro-prediction model of motor vehicle carbon emissions based on VSP is most suitable for the prediction of carbon emissions of light-duty vehicles under the China 6emission standard in Fuzhou.3.In the analysis of the emission reduction effect at the micro level,as the speed increases,the emission reduction rate of light vehicles with the China 6 emission standards is gradually reduced compared with the China 3 and China 5 emission standards for light vehicles,and the pollutants CO₂,CO and HC The maximum emission reduction range of the emission reduction can reach 65.5%,248.52%,and 368.87%respectively.With the increase of VSP,the emission reduction range of light-duty vehicles under the China 6 emission standard also gradually increases,and the maximum emission reduction range of pollutants CO₂,CO and HC can be Reaching 94.4%,692.03%and 416.97%respectively;the carbon emission factor of light vehicles with China 6 emission standards has also been greatly reduced.Compared with light vehicles with China 3 emission standards,the reduction of CO₂emission factors is42.39%,18.13%,11.26%,CO emission factor reduction rates were211.72%,29.98%,22.32%,HC emission factor reduction rates were221.37%,147.2%,124.73%.4.According to the established motor vehicle carbon emission micro-prediction model,the difference between the calculated carbon emission factor of the experimental section of the vehicle and the carbon emission factor calculated from the measured data is only within 5%.Taking the experimental road section as the research object,the analysis shows that between 2020 and 2030,compared with the continuous implementation of the China 5 emission standard,the carbon emission reduction rate of motor vehicles can reach up to 91.14%,and the carbon reduction effect is more significant.5.Compared with the no measures scenario,in the single control scenario,The maximum emission reductions of CO₂,CO,and HC in the E（Eliminate vehicles with China 3 and China 4 emission standards）scenario are 0.32%,1.734%,and 0.487%,respectively.The maximum emission reduction rates of CO₂,CO,and HC under H-M（China 6emission standards will be implemented in 2025）are respectively It can reach 6.725%,17.662%,37.026%,and the reduction rate of CO₂,CO and HC under the H-S（China 6 emission standards will be implemented in2020）scenario can reach 9.182%,16.623%,and 50.554%respectively.The carbon emission reduction effect under the comprehensive scenario is only slightly more significant than the H-M and H-S scenarios.This paper studies the carbon emission characteristics of light vehicles under the China 6 emission standard in Fuzhou,establishes the most suitable microscopic carbon emission prediction model for light vehicles under the China 6 emission standard in Fuzhou,and explores carbon emission reduction by setting different motor vehicle carbon emission control scenarios.The most effective control measures provide a theoretical basis for the government to grasp the carbon emissions of light vehicles in Fuzhou and formulate corresponding traffic carbon emission control measures.