进气节流对柴油机性能和排放影响的试验研究

吴滴; 刘波; 康见见; 张超; 刘冰

doi:10.3969/j.issn.1001-2222.2020.03.013

车用发动机 >

2020 , Vol. 0 >Issue 3: 82 - 87

DOI: https://doi.org/10.3969/j.issn.1001-2222.2020.03.013

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进气节流对柴油机性能和排放影响的试验研究

吴滴 ,
刘波 ,
康见见 ,
张超 ,
刘冰

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（重庆车辆检测研究院有限公司，重庆 401122）

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Experimental Study on the Influences of Intake-Throttling on Performance and Emission for Diesel Engine

WU Di ,
LIU Bo ,
KANG Jianjian ,
ZHANG Chao ,
LIU Bing

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（Chongqing Vehicle Inspection and Research Institute Co.,Ltd.,Chongqing 401122,China）

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摘要

针对柴油机在进行国六排放标准试验时，WHTC循环试验中排气温度低，部分工况点达不到后处理器的起喷温度，SCR催化转化效率不佳的问题，在1台带有节气门的柴油机上开展了试验，研究了进气节流对柴油机排气温度、空燃比、排放和燃油消耗率等的影响。结果表明：低负荷时，节气门关度在0%~40%时，进气节流对柴油机性能和排放影响较小；节气门关度在40%~65%时，进气节流可以明显提高柴油机小负荷时的排气温度，且不会使发动机不透光烟度、CO、THC、NO_x显著增加；当节气门关度超过70%时，进一步增加节气门关度能迅速提升排气温度，但是会使发动机排放严重恶化，燃油消耗率迅速升高。

关键词： 柴油机; 进气节流; 排气温度; 燃油消耗率; 排放

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吴滴 , 刘波 , 康见见 , 张超 , 刘冰 . 进气节流对柴油机性能和排放影响的试验研究[J]. 车用发动机, 2020 , 0(3) : 82 -87 . DOI: 10.3969/j.issn.1001-2222.2020.03.013

Abstract

In order to solve the problem that SCR catalytic conversion efficiency is not good when the China Ⅵ emission test was conducted because the needed lowest temperature of aftertreatment couldnot be met due to the low exhaust temperature in partial conditions of WHTC, the experiment was carried out on an engine with intake throttle and the influences of intake throttling on exhaust temperature, airfuel ratio, emission and BSFC were studied. The results show that the throttle closing between 0% and 40% has minor influence on the performance and emission of diesel engine and that between 40% and 65% can significantly improve the exhaust temperature of diesel engine at low load, which has little influence on opacity, CO, THC and NO_xemission. The increase of throttle closing beyond 70% will increase the exhaust temperature rapidly, but lead to the deterioration of emission and BSFC.

Key words： diesel engine; intake throttling; exhaust temperature; BSFC; emission

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