米勒循环对重型柴油机燃烧和排放的影响  

Effect of Miller Cycle on Combustion and Emissions of Heavy Duty Diesel Engine

作　　者：范岚岚[1,2] 王斌 杜桂枝[1,2] 李浩 Fan Lanlan;Wang Bin;Du Guizhi;Li Hao(China National Heavy Duty Truck Group Company Limited,Jinan 250000,China;Jinan Power of China National Heavy Duty Truck Group Company Limited(Sinotruk),Powertrain Design Department of Automotive Research Institute,Jinan 250000,China)

机构地区：[1]中国重型汽车集团有限公司,山东济南250000 [2]中国重汽济南动力有限公司汽车研究总院动力总成设计部,山东济南250000

出　　处：《内燃机学报》2024年第3期203-208,共6页Transactions of Csice

基　　金：国家重点研发计划-政府间国际科技创新合作重点专项资助项目(2022YFE0100100).

摘　　要：基于某重型高压共轨柴油机开展了米勒循环在外特性工况点、排放控制工况点和最低燃油消耗率工况点对发动机性能、燃烧和排放的影响研究.米勒循环依靠进气门晚关来实现,其中进气门关闭时刻分别推迟了30°、50°和70°CA.结果表明:重型柴油机应用米勒循环能够在实现较低缸内压力峰值下,较低燃油消耗率的目标,相同缸内压力峰值下燃油消耗率能够降低约1 g/(kW·h);大的进气门晚关角度能够实现在相同燃油消耗率下,排气温度提升20℃以上,可作为发动机排气热管理的储备技术.大的进气门晚关角度在外特性高转速段会造成功率损失,因而必须与高效增压器配合使用才能保证全局功率不损失,同时降低燃油消耗率,提升排气温度.Effect of Miller cycle on engine performance,combustion and emissions on operating points of full load,emission control area and lower fuel consumption area were investigated in a common rail heavy duty diesel engine.The Miller cycle was achieved by delaying the intake valve close timing from the base engine to 30°,50°and 70°CA,respectively.Research results show that the application of Miller cycle can achieve lower fuel consumption at a lower peak combustion pressure.Under the same peak combustion pressure,the late intake valve close(LIVC)timing can reduce fuel consumption by 1 g/(kW·h).Under the same fuel consumption,the exhaust temperature can increase by 20℃when larger LIVC timing is used,benefit to exhaust thermal management.However,larger LIVC timing can cause power loss at high speed and full load operation,therefore a high efficiency turbocharger has to be used to ensure the global power output,reduce the fuel consumption and increase the exhaust temperature.

关 键 词：重型柴油机 米勒循环 排气温度 

分 类 号：TK427[动力工程及工程热物理—动力机械及工程]