| 杨永忠，申立中，毕玉华，雷基林，王俊.大气压力/VNT/EGR对车用柴油机性能与排放的影响[J].内燃机工程,2018,39(3):36-44. |
| Effects of Atmospheric Pressure/VNT/EGR on Performance and Emissions of a Vehicle Diesel Engine |
| DOI：10.13949/j.cnki.nrjgc.2018.03.006 |
| Key Words:diesel engine atmospheric pressure variable nozzle turbocharger exhaust gas recirculation response surface method |
| Author Name | Affiliation | | YANG Yongzhong,SHEN Lizhong,BI Yuhua,LEI Jilin,WANG Jun | 1.Yunnan Province Key Laboratory of Internal Combustion Engines, Kunming University of Science and Technology, Kunming 650500, China
2.Kunming Yunnei Power Co., Ltd., Kunming 650000, China |
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| 全文下载次数: 2001 |
| Abstract:In order to study the effects of variable nozzle turbocharger(VNT), exhaust gas recirculation(EGR) and atmospheric pressure on the performance and emissions of a vehicle diesel engine, a relevant test was conducted by using an atmospheric pressure simulation device. Based on response surface methodology, the influence of the interaction effect of VNT nozzle opening, EGR valve opening and atmospheric pressure on the engine performance and emissions was studied and analyzed. The results show that with the decrease of atmospheric pressure and the increase of EGR valve opening, the engine output power declines and the fuel economy deteriorates. When VNT is combined with EGR and the EGR valve is closed or has a small opening, the torque increases and the brake specific fuel consumption decreases gradually at peak torque condition as the VNT nozzle opening decreases; while the torque comes down and BSFC goes up at the same condition with the decrease of VNT nozzle opening when the EGR valve has a large opening or full opening. However, no matter what the EGR opening may be at the rated power condition, the torque increases and BSFC declines as the VNT opening decreases. As the atmospheric pressure goes up, the brake specific nitrogen oxides(NOx) emissions increase and smoke decreases. When VNT is combined with EGR, the power, brake specific NOx emissions and smoke demonstrate different trends at different operation conditions. In order to obtain a good overall engine performance, it is necessary to match VNT nozzle opening with EGR valve opening properly according to different operation conditions. |
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