Vehicle types, technologies, and driving conditions are key factors affecting emission factors and fuel consumption. In this study, we measured the hydrocarbon (HC), carbon monoxide (CO), and nitrogen oxide (NO_x) emission factors, and fuel consumption of vehicles with a (1) carburetor (CVs), (2) multipoint injection technology and three-way catalyst (MTVs), and (3) multipoint injection technology, three-way catalyst, and exhaust gas recirculation device (MTEVs) under real driving conditions using an OBS-2200 portable emission measurement system. The results showed that both the distance- and fuel-based HC, CO, and NOx emission factors of CVs were 2.7–6.6 times higher than those of MTVs and MTEVs. The average incomplete fuel conversion rates (IFCRs) of CVs were 3.8 and 4.4 times higher than those of MTVs and MTEVs, respectively. The molar ratios of the CO/HC pollutants were 7.6, 5.6, and 2.8 for CVs, MTVs, and MTEVs. Furthermore, the correlation between the vehicle-specific power and fuel consumption rate was significant. The exhaust gas recirculation (EGR) system could improve the fuel combustion efficiency and reduce vehicle emissions, particularly under high-speed and acceleration conditions.

车辆类型，技术和驾驶条件是影响排放因子和燃料消耗的关键因素。在这项研究中，我们测量了碳氢化合物（HC），一氧化碳（CO）和氮氧化物（NO _x）（1）化油器（CV），（2）多点喷射技术和三元催化器（MTV）以及（3）多点喷射技术，三元催化器和废气的车辆的排放因子和燃油消耗使用OBS-2200便携式排放测量系统在实际驾驶条件下的再循环设备（MTEV）。结果表明，基于距离和基于燃料的CV HC，CO和NOx排放因子均比MTV和MTEV的高2.7-6.6倍。CV的平均不完全燃料转化率（IFCR）分别是MTV和MTEV的3.8和4.4倍。对于CV，MTV和MTEV，CO / HC污染物的摩尔比分别为7.6、5.6和2.8。此外，车辆特定功率与燃料消耗率之间的相关性很显着。