基于响应曲面法的煤油发动机气门正时优化

Optimization of Valve Timing of a Kerosene Engine Based on RSM

利用基于仿真的响应曲面优化方法,对改型的煤油活塞发动机气门正时多目标优化问题进行了研究。建立了发动机性能仿真模型,以进气/排气正时、点火提前角为优化变量,以提高有效功率和降低燃油消耗率为设计目标进行了响应曲面优化。分析结果表明:相对于原汽油机,改型的煤油机进气门开启时刻要推迟,排气门关闭时刻要迟后,并且要提前一定的点火提前角,以得到最佳的发动机性能;同时,应用响应曲面法可以提升仿真优化的效率。

Using optimization method of response surface based on the simulation,modified kerosene engine valve timing multi-objective optimization problem was studied.A simulation model of the engine performance was established with the intake,exhaust timing,ignition advance angle as optimization variables and with the improvement of brake power and brake special fuel consumption as the design optimization target.The results show that：relative to this gasoline engine,intake valve opening timing of modified kerosene engine must be postponed,the exhaust valve closing time must be postponed,and ignition timing must be advanced for better engine performance;and applications of response surface methodology can improve the efficiency of optimization.