Study on Ammonia Emission Characteristics of Light-duty Gasoline Vehicles under Different Test Cycles
With the increasing awareness of environmental protection,the problem of ammonia(NH3)emis-sions from road vehicles is getting more and more attention.In order to grasp the actual situation of NH3 e-mission from light-duty gasoline vehicles under certain specific scenarios,two China VI and one China V light-duty gasoline vehicles were used as research objects,and the NH3 emission tests were conducted under different loads,different test cycles(including the WLTC cycle and the RDE cycle),different emission stan-dards,and the use of a special technological route(oxygen scavenging function),respectively.The results show that the maximum instantaneous NH3 emission rate of the vehicle in the low-speed section of the WLTC cycle is 2.7 times higher than that of the urban section of the RDE cycle.In the first 1 500 s,the NH3 emission factor in the air-conditioning-on state was 1.47 times higher than that in the air-conditioning-off state,and the maximum instantaneous emission rate of NH3 was 26.7 times higher than that in the air-condi-tioning-off state;and when the air-conditioning was turned on,the distribution of the high-emission areas of NH3 was more concentrated.In the total trip of RDE cycle,the NOx emission factor of the National VI standard vehicle was 56.1%lower than that of the National V standard vehicle,but the NH3 emission factor was 12.8 times higher than that of the National V standard vehicle.After the vehicle performed the oxygen scavenging operation,both NOx and NH3 generation patterns were significantly changed,with better control of NOx emissions but increased probability of NH3 generation.
万方数据
维普
