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不同环境温度下E10轻型车CO2排放研究
Study on CO2 Emission of E10 Light-Duty Vehicle Under Different Ambient Temperature
【摘要】 全球变暖使得机动车排放的温室气体受到重视。为量化温度对车辆CO2排放的影响,本研究在-10、0、23和40℃的环境温度下对一辆轻型E10汽油车进行了WLTC测试循环,发现热起动时-10和0℃的CO2排放因子相较23℃分别高了10.4%和20.8%,冷起动时车辆实现完全热机的时间长于国六标准要求的300 s。相对偏差因子RF在车辆完全热机时接近于1,而23和40℃分别在RF4和RF3接近1,说明环境温度越高,实现完全热机所需的时间就越短。-10℃时绝对偏差因子AF1和AF2分别是23℃的1.98倍和3.63倍,量化了冬季与夏季车辆冷起动CO2排放的差距。累积CO2排放与怠速CO2排放因子存在很强的相关性,可用于建立或修正微观CO2排放模型,并建议在评估车辆CO2排放时考虑环境温度的变化。
【Abstract】 As a result of global warming,attention has been paid to greenhouse gas emitted by vehicles.In order to quantify the effect of temperature on vehicle CO2 emission,WLTC test cycle of a light-duty E10 gasoline vehicle is carried out at the ambient temperatures of-10,0,23 and 40℃in this study.It is found that the CO2 emission factors of-10 and 0℃at hot-start are 10.4%and 20.8%higher than those at 23℃,respectively.For cold-start engine,achieving full warm-up is longer than 300 s,which is required by China 6 standard.The relative deviation factor RF of the vehicle with full warm-up is close to 1,and 23 and 40℃are close to 1 at RF4 and RF3,respectively,indicating that the higher the ambient temperature,the shorter the time required to achieve full warm-up.The absolute deviation factors AF1 and AF2 at-10℃are 1.98 and 3.63 times higher than those at 23℃,respectively,which quantifies the difference of CO2 emission of cold-start vehicles in winter and summer.There is a strong correlation between cumulative CO2 emission and idle CO2 emission factors,which can be used to establish or modify microscopic CO2 emission models,and it is suggested that the change of ambient temperature should be taken into account when evaluating vehicle CO2 emission.
【Key words】 CO2 emission; CO2 modeling; ambient temperature; light-duty vehicle; E10 ethanol gasoline; WLTC cycle; idle condition;
- 【文献出处】 汽车工程 ,Automotive Engineering , 编辑部邮箱 ,2023年03期
- 【分类号】X734.2;U491.92
- 【下载频次】27