不同海拔下基于VNT驱动的EGR对轻型柴油机燃烧与排放的影响

doi:10.19562/j.chinasae.qcgc.2022.07.015

Abstract

Abstract:

Variable nozzle turbocharging （VNT） technology and exhaust gas recirculation （EGR） are ideal technical measures to reduce in-cylinder emission for light-duty diesel engine. The implementation of China VI light-duty vehicle emission regulations has drawn more attention to the pollutant emission of light-duty vehicles in plateau areas. Therefore， the effect of EGR driven by VNT on combustion and emission performance of a light-duty high-speed direct injection diesel engine is experimentally studied at altitudes of 0， 1 000， and 1 960 m by using a plateau environment simulation device. The results show that when EGR is driven by VNT， the variation range of EGR rate is almost the same within the same VNT nozzle opening range at different altitudes. As EGR rate increases， maximum mean temperature decreases at different altitudes.At the maximum torque condition， the peak cylinder pressure decreases， and the start of combustion is delayed， and combustion duration is prolonged， however， at the rated power condition， the peak cylinder pressure increases， the start of combustion is advanced， and combustion duration is shortened. EGR can still effectively reduce NO _x emissions at different altitudes， and the decreasing amplitude of brake specific NO _x emission increases as altitude increases. When driving EGR based on VNT at different altitudes， with the increase of EGR rate， brake specific CO emission and smoke both increase at the maximum torque condition， while brake specific CO emission and smoke both decrease accordingly at the rated power condition. Furthermore， EGR has a more significant effect on brake specific CO emission and smoke in plateau areas.

Key words: diesel engine, high altitude, variable nozzle turbocharger, exhaust gas recirculation, combustion, emission

Jun Wang,Lizhong Shen,Yuhua Bi,Jilin Lei. Effect of EGR Driven by VNT on Combustion and Emission of Light-Duty Diesel Engine at Different Altitudes[J].Automotive Engineering, 2022, 44(7): 1088-1097.

Figures/Tables 13

References 23

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项目	参数
发动机型式	直列4缸四冲程，增压中冷
缸径×行程/mm	80 × 92
发动机排量/L	1.85
压缩比	18.5
额定功率/kW	82 （4 000 r·min^-1）
最大转矩/（N·m）	265 （2 200 r·min^-1）

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Effect of EGR Driven by VNT on Combustion and Emission of Light-Duty Diesel Engine at Different Altitudes

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