Model for Estimating Transient NOx of Diesel Engine

XIONG Xingwang; YU Jintao; GAO Junhua; ZHANG Lele; SHANG Yulei

doi:10.3969/j.issn.1001-2222.2018.05.011

Vehicle Engine ›› 2018, Vol. 0 ›› Issue (5) : 61-64. DOI: 10.3969/j.issn.1001-2222.2018.05.011

Model for Estimating Transient NO_x of Diesel Engine

XIONG Xingwang¹,YU Jintao¹,GAO Junhua¹,ZHANG Lele²,SHANG Yulei²

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Abstract

ETC test and 200 s idle test were conducted on a China Ⅴ diesel engine. According to the ETC test results, the relationship between NO_x volume fraction and excess air ratio at idle and nonidle conditions could be expressed as power formula. For the 200 s idle test, the relative error between estimated values and test values of NO_x volume fraction gradually decreased within 0—30 s, increased within 30—170 s and remains nearly unchanged within 170—200 s. With the transient NO_x estimation model built by the fitted empirical formulas, the NO_x emissions of ETC cycle were verified. The results show that estimated values of NO_x volume fraction and mass flow agree well with test values, but the difference at the peak is obvious. In addition, estimated value of NO_x cycle cumulative mass is 4.6% higher than test value.

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/ mso-hansi-font-family: 宋体">diesel engine;nitrogen oxides;mathematical model;numerical calculation

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XIONG Xingwang,YU Jintao,GAO Junhua,ZHANG Lele,SHANG Yulei. Model for Estimating Transient NO_x of Diesel Engine[J]. Vehicle Engine. 2018, 0(5): 61-64 https://doi.org/10.3969/j.issn.1001-2222.2018.05.011