重型车低负荷运行特征及NO<sub><sub>x</sub></sub>排放特性

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Abstract The operation and emission performances of a heavy-duty diesel urban vehicle which meets the China VI emission standard have been investigated based on remote monitoring data. Furthermore, a 6L diesel engine which also meets the China VI emission standard has been adopted to carry out the World Harmonized Transient-State Cycle (WHTC) and California Low Load Cycle (LLC) emission tests on an engine test bench using the engine-in-the-loop methodology. The NO_x emission characteristics under the low-load conditions have been studied. Results suggest that the heavy-duty diesel urban vehicle tends to run under the low-load conditions, accompanied with a large portion of NO_x emitted. The LLC test reveals the fact that the engine spends more time running under the low-load condition, which leads to a low emission temperature as well as low NO_x conversion efficiency. The high NO_x emission under the LLC test is mainly caused by the low exhaust temperature. China is suggested to develop low-load cycle to control the NO_x emissions under such conditions according to the actual driving characteristics of commercial vehicles. The loading setting should be taken into consideration when developing the low-load cycle given the fact that the NO_x conversion and emission are significantly affected by the vehicle loading.

Key words： heavy-duty diesel vehicle remote monitor low load cycle run characteristics nitrogen oxides emission

Received: 12 April 2022

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X511

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	Articles by authors
	WANG Xiao-wei
	JING Xiao-jun
	GAO Tao
	LI Gang
	GU Xue-jing
	ZHANG You-yuan

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WANG Xiao-wei,JING Xiao-jun,GAO Tao等. Low load running characteristics and NO_x emission under low load for heavy-duty diesel vehicles[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5063-5071.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5063

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