不同环境温度下 E10 轻型车 CO₂排放研究

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.