涡轮增压发动机二冲程制动性能  

Performance of two-stroke engine braking for turbocharged diesel engine

作　　者：刘国宪[1] 何仁[1] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2010年第1期35-39,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：教育部博士学科点专项科研基金资助项目(200602990110);江苏省普通高校研究生科研创新工程项目(CX08B-043Z)

摘　　要：考虑到进、排气管内的压力波与涡轮增压器对发动机进、排气过程的影响,应用GT-POWER软件建立一种二冲程制动工况下的涡轮增压发动机模型,并通过对发动机制动过程仿真计算,分析发动机转速、排气门开启时刻与发动机制动性能之间的关系.仿真结果表明,在排气门工作参数一定时,发动机制动转矩、制动功率随转速增加而增大;在排气门升程曲线、第二次开启发生时刻均一定时,对应每个发动机转速,均存在唯一的第一次开启发生时刻使得制动功率最大,而且该时刻随发动机转速而变化;在排气门升程曲线、第一次开启发生时刻均一定时,第二次开启发生时刻延迟,将使得压气机运行点趋近甚至超出喘振线.A two-stroke braking turbocharged diesel engine model was established with GT -POWER, and the effects of pressure wave in the intake and exhaust pipes and the turbocharger on the engine intake and exhaust process were considered. The relations between engine speeds and exhaust valve open time and the engine brake performance were studied through simulating the engine two-stroke brake process. The simulation results show that the brake torque and the brake power increase as the engine speed rises when the exhaust valve operation parameters are constant. If the exhaust valve lilt profiles and the second open time are constant, as for every engine speed, the brake power reaches maximum only at the first open time for exhaust valves, and the only open time varies with engine speed. If the exhaust valve lift profiles and the first open time are fixed, the compressor operation points get closer and even beyond the surge line, because of the delay of the second open.

关 键 词：发动机制动 二冲程 排气提前角 制动功率 涡轮增压器 喘振 

分 类 号：U463.5[机械工程—车辆工程]