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    • Study on the Influence of Intake and Exhaust Throttling on Diesel Engine Performance in Plateau Environment
    DOI：10.13949/j.cnki.nrjgc.2022.03.005
    Key Words:plateau environment  diesel engine  intake throttling  exhaust throttling  exhaust temperature  emission
    Author NameAffiliationE-mail
    WANG Jinhao* Yunnan Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China 2958404378@qq.com 
    BI Yuhua* Yunnan Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China 815569621@qq.com 
    SHEN Lizhong Yunnan Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    NIE Xuexuan Yunnan Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    WAN Mingding Yunnan Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    WANG Zhengjiang Yunnan Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
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    Abstract:In order to study the influences of intake and exhaust throttling on diesel engine performance in plateau environment， a bench test was carried out on an exhaust turbocharged diesel engine in plateau environment. And the influences of intake throttling and exhaust throttling on intake mass flow， combustion， exhaust temperature， emission and fuel consumption of diesel engine were studied respectively. Results show that after adopting intake and exhaust throttling， the intake mass flow of diesel engine and the maximum in-cylinder pressure decreased， while the maximum combustion heat release rate， in-cylinder combustion temperature， exhaust temperature， emission and fuel consumption increased. With the increase of the speed， the influence trends of intake throttle and exhaust throttle were different. Under three working conditions of diesel engine， i.e. at torque of 50 N·m and speed of 1 400 r/min， 1 800 r/min and 2 200 r/min， when the intake pressure decreased by 25 kPa， the exhaust temperature increased by 75 ℃， 60 ℃ and 52 ℃ respectively， and the NOx emission increased by 160×10-6， 140×10-6 and 114×10-6 respectively. The soot emission increased by 0.079 FSN， 0.062 FSN， 0.052 FSN respectively， and the specific fuel consumption increased by 4.4 g/（kW·h）， 5.5 g/（kW·h）， 7.4 g/（kW·h）， respectively. After adopting exhaust throttling， with the decrease of exhaust back pressure， the intake mass flow of diesel engine and the maximum in-cylinder pressure decreased， while the maximum combustion heat release rate and in-cylinder combustion temperature rose. The exhaust back pressure increased by 25 kPa， the exhaust temperature increased by 35 ℃， 50 ℃， 62 ℃ respectively. The NOx emission increased by 67×10-6， 102×10-6， 144×10-6. The soot increased by 0.037 FSN， 0.033 FSN， 0.022 FSN， respectively. Specific fuel consumption increased by 9.4 g/（kW·h）， 10.9 g/（kW·h） and 13.3 g/（kW·h）， respectively.
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