基于发动机平均值模型对汽油发动机空燃比进行仿真研究

Simulation Study on Air-fuel Ratio of Gasoline Engine Based on the Mean Value Engine Model

空燃比作为发动机其他参数调整的基础和依据,在控制参数调整中起到重要的作用。为了使发动机各项性能指标达到最优的目的,需要对空燃比进行精准控制。本文在MATLAB/Simulink的环境下,建立了包含进气系统动力学模型、燃油蒸发与动态油膜模型、动力输出子系统模型的发动机平均值模型。对该模型燃用汽油的空燃比进行了仿真,仿真结果与发动机燃用汽油的化学计量空燃比相同,为进一步研究发动机空燃比控制具有重要意义。

As the basis and for the adjustment of other parameters of engine,the air-fuel ratio plays an importment role in the control parameter adjustment.In order to optimize the performance of the engine,the air-fuel ratio needs to be controlled accurately.Under the MATLAB/Simulink environment,this paper establishes the mean value engine model including the intake system dynamic model,the fuel evaporation and dynamic oil film model and power output subsystem model.The simulation results are the same as stoichiometric air-fuel ratio of burning-gasoline engine,which is of great significance to the further study on the air-fuel ratio control of the engine.