摘要
为研究LPG公交车排放特性与比功率的关系，推导了公交车比功率（VSP）的计算公式，并采用车载排放测试技术测试了车辆实际运行工况下的排气污染物的排放值和车速，对数据进行处理与分析j结果表明，公交车实际运行的VSP落在-5—5kW／t区间内的行驶时间占比约大于96％。VSP为负时，排气污染物排放速率变化较小，排放因子随着VSP增大缓慢增大；VSP为正时，随着VSP增大，CO和HC的排放速率与排放因子先增大后减小，NO，排放速率呈增大趋势，而排放因子先增大，后缓慢下降。
For studying the relationship between emission characteristics and vehicle specific power （VSP） of LPG transit buses, the formula of VSP for transit bus is derived, the speed and pollutant emissions of buses under real operation conditions are measured with portable emission measurement system with these data processed and analyzed. The results show that the proportion of bus driving time in real operation with their VSP falls into the interval of [-5, 5 ] kW/t is more than 96%. At negative VSP range, the emission rates of all pollutants only have minor change and their emission factors increase slowly with the rise of VSP; while at positive VSP range, with the increase of VSP, the emission rates and emission factors of CO and HC rise first and then fall ; while the emission rate of NOx shows a tendency of steady increase and its emission factor rises first and then falls slowly.
出处
《汽车工程》
EI
CSCD
北大核心
2014年第3期269-272,263,共5页
Automotive Engineering
基金
国家863计划项目(2006AA11A1C7)资助
关键词
LPG公交车
排放速率
排放因子
比功率
车载排放测试
LPG transit bus
emission rate
emission factor
vehicle specific power
onboard emission test
