利用高精度的移动排放测试仪，对液化天然气巴士和混合动力巴士进行城市典型道路工况下的排放测试，对比分析车辆的排放特征。试验结果表明：液化天然气车较之混合动力车的一氧化碳排放有较大下降，氧化氮排放较为接近，而碳氢化合物排放远高于混合动力巴士；总体而言，LNG车三种污染排放因子随着车速的增加而不断减少，但三种污染物排放速率却随着车速和加速度的变化增减不一；混合动力车因其纯电动起步模式和加速时采用电机辅助驱动，使得其三种污染物在15～20 km/h排放达到最佳，在加速度为0时一氧化碳和碳氢化合物排放达到最大值，而氧化氮在加速度0.5 m/s2附近达到最大。%The emission experiments of LNG (Liqueifed Natural Gas) bus and Hybrid bus on urban roads were carried out with high-precision mobile emission tester. Then the vehicles’ emission characteristics were analyzed. Experimental results show that the CO emission of the LNG vehicle is less than that of the hybrid vehicle, and NOx emissions are relatively close to each other, while the HC emission of the LNG bus is far higher than that of the hybrid bus. Three emission factors of LNG vehicle decrease with the increase of speed, but the emission rates are different with the change of speed and acceleration. Due to the mode of pure electric start and motor auxiliary accelerating of the hybrid bus, the emissions of the three pollutants achieve the least at the speed of 15-20 km/h, and CO and HC emissions reach their maximums at the acceleration of 0 while the NOx emission reach its maximum at the acceleration of around 0.5 m/s2.
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