基于LaGrange-SUMT方法的全电控柴油引燃天然气发动机MAP优化标定技术

A Mapping Technique Based on the LaGrange-SUMT Method for a Pilot Ignited CNG Engine

利用非线性规划理论,采用LaGrange SUMT方法建立了电控发动机全工况范围内多变量、多目标的优化模型,并在全电控柴油引燃天然气发动机上进行了应用。试验结果证明,该方法可以减少优化参数的试验量,在较少的试验量基础上获得最优控制MAP。发动机的NOx、碳烟排放明显优于欧洲II排放标准,经济性与原柴油机相当。

By using the nonlinear theory and the LaGrange-SUMT method the optimum model for multi-variables multi-goals for the whole operating conditions was developed and was applied in a lean burn, sequential port injection and electronically controlled CNG/Diesel dual fuel engine. Experimental results show that the method can decrease the times of the experiment and get the optimum controlling MAP with the reduced experiments. The NO_x and PM emissions of the modified engine can meet the Europe II emission regulation and an equivalent fuel economy as that of diesel engine is obtained.