耐久试验中不同测试循环下排放规律研究

采用标准台架循环(SBC)和标准道路循环(SRC)两种方式,分别对催化器进行耐久试验,并在不同耐久里程时分别进行排放试验。采用SBC方式时,随耐久里程增加,CO排放无明显变化,NO_x明显增大,THC有小幅增大;CO瞬态曲线由单峰态变为双峰态,双峰态峰值小于单峰态峰值;NO_x为双峰态,第1个峰值总体上呈增大趋势,第2个峰值无明显规律;THC为明显的单峰态,峰值总体上呈增大趋势。采用SRC方式时,随耐久里程增加,CO排放明显增大,NO_x也呈增大趋势,THC先增大后减小;CO瞬态曲线始终为单峰态,峰值呈增大趋势;NO_x为双峰态,第1个峰值与第2个峰值总体上均呈增大趋势;THC为明显的单峰态,峰值先增大后减小。

Emission Laws of Diesel Engine during Different Endurance Test Cycles

Endurance tests of catalyst were conducted with the standard bench cycle (SBC) and standard road cycle (SRC) .E-missions of different endurance mileages were also measured .In SBC test ,CO emission kept unchanged ,NOx emission obvi-ously increased and THC emission had a small increase with the increase of endurance mileage .In addition ,CO transient curve changed from single peak to double peaks with smaller peak value than that of single peak ,NOx transient curve showed double peaks with the characteristics of first increasing peak and second constant peak ,and THC transient curve displayed single peak of increasing trend .In the SRC test ,CO and NOx emissions increased and THC emission first increased and then decreased .In addition ,CO transient curve showed a single peak of increasing ,NOx curve showed double increasing peaks and THC showed single peak of first increasing and then decreasing .