基于GT-power的五冲程发动机多目标优化  

Multi-objective optimization of a five-stroke engine based on GT-power

作　　者：赖晨光[1] 王思政 胡博 伍朝兵 李怡俊 LAI Chenguang;WANG Sizheng;HU Bo;WU Chaobing;LI Yijun(Key Laboratory of Advanced Manufacturing Technology for Automobile Parts,Ministry of education,Chongqing University of Technology,Chongqing 400054,China;School of Vehicle Engineering,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学汽车零部件制造及检测技术教育部重点实验室,重庆400054 [2]重庆理工大学车辆工程学院,重庆400054

出　　处：《重庆理工大学学报（自然科学）》2023年第3期77-85,共9页Journal of Chongqing University of Technology：Natural Science

基　　金：重庆市教委科学技术研究项目(青年)(2020CJZ053)。

摘　　要：五冲程发动机独特的二次膨胀冲程提升了发动机的热效率,独特的工作特性使其适合应用于增程式汽车。为探究高/低压缸进排气正时和点火时间对五冲程发动机性能的影响,基于GT-Power建立五冲程发动机一维模型,并在限制扭矩的条件下运用DOE工具开展目标为功率最大、比燃油消耗率和NO_(x)排放最低的多目标优化。结果表明:适当地增大低压缸气门重叠角可以有效降低排气流动损失,提升废气做功的效率;最终,各个目标值分别实现了3.26%、2.50%和0.47%的优化。多目标优化方法在五冲程发动机参数优化上的应用,保证了变量在可行域范围内实现多目标改善。The unique secondary expansion stroke of a five-stroke engine improves thermal efficiency,and its unique performance characteristics make it suitable for range extenders.In order to explore the influence of timing and ignition time of a high/low pressure cylinder valve on the performance of a five-stroke engine,this paper establishes a one-dimensional model of a five-stroke engine based on GT-power,and uses the DOE tool to carry out a multi-objective optimization with the target of maximum power,minimum BSFC and minimum NO_(x) emissions under limited torque conditions.The result indicates that properly increasing the valve overlap angle of the low pressure cylinder can reduce the exhaust flow loss and improve the efficiency of exhaust work.At last,each target value is optimized by 3.26%,2.5%and 0.14%respectively.The application of multi-objective optimization to the parameter optimization of five-stroke engines ensures the variables in a feasible range realizes the improvement of multiple objectives.

关 键 词：五冲程发动机 压缩比 多目标优化 气门正时 

分 类 号：TB53[理学—物理] U461.4[理学—声学]