一种稀释采样气体污染物延时估算方法  

A Method of Estimating Delay Time of Diluted Gas Emissions

作　　者：熊兴旺[1] 王明达[2] 李昂[1] 于津涛[1] 高俊华[1] Xiong Xingwang;Wang Mingda;Li Ang;Yu Jintao;Gao Junhua(China Automotive Technology&Research Center Co.,Ltd.,Beijing,100176,China;Chinese Research Academy of Environmental Sciences)

机构地区：[1]中国汽车技术研究中心有限公司,北京100176 [2]中国环境科学研究院

出　　处：《小型内燃机与车辆技术》2020年第3期63-66,74,共5页Small Internal Combustion Engine and Vehicle Technique

摘　　要：义一种以发动机转速为基准,利用互相关函数估算CO2、CO和NOx延时的方法。根据NRTC冷态循环试验数据,通过互相关函数法估算了稀释后CO2、CO和NOx延时,并与基于过渡工况估算延时的方法进行了对比。结果表明:由互相关函数法得到的CO2延时与过渡工况法得到的延时差异0.0s,互相关函数法的CO延时比过渡工况法的小0.6s,互相关函数法的NOx延时比过渡工况法的大1.6s。根据2种方法所得延时修正后的稀释前CO2和CO曲线差异较小,NOx曲线差异略大。Based on engine speed,a method of estimating delay time of CO2,CO and NOx by using crosscorrelation function is defined. The delay time of diluted CO2,CO and NOx of cold started NRTC test was obtained by using the cross-correlation function method and the method based on transient conditions respectively. The results show that the CO2 delay time of the cross-correlation function method has a 0.0 s difference with the delay time correction method based on transient conditions;the CO delay time of the cross-correlation function method is 0.6 s smaller than the method based on transient conditions;and the NOx delay time of the cross-correlation function method is 1.6 s larger than the method based on transient conditions. Based on the two kinds of delay time,the transient emissions without dilution were calculated respectively. Differences between the cross-correlation function method corrected CO2 curve and transient conditions method corrected CO2 curve are small. The differences between the two CO curves are also small. And the differences between the two NOx curves are larger.

关 键 词：延时 稀释 过渡工况 互相关函数 

分 类 号：TK427[动力工程及工程热物理—动力机械及工程]