基于模型汽油发动机的空燃比控制器仿真研究

针对四缸四冲程汽油发动机，建立了合理的发动机数学模型，并对模型发动机进行仿真标定实验，获得喷油MAP图。根据发动机运行特点及控制要求，在均值模型的基础上，建立了稳态部分负荷、瞬态、怠速三种主要运行工况下的控制器模型。并给出了以上模型在Matlab／Simulink环境下的结构框图和综合仿真过程。仿真结果表明：控制器能够判断不同工况，并自动切换到相应的控制模块，使空燃比达到预期要求，具有良好的控制性能，控制策略与控制算法可行，为电控系统的进一步研究奠定基础。

Simulation and Research on Air/Fuel Ratio Control For Model Based Gasoline Engine

An engine model was established for the 4 cylinder 4 stroke gasoline engine. And the fuel MAP of the mode engine was obtained by sealing experiment. According to the engine operating feature and control requirements, the controller models was made for three main types operating conditions, sta- ble operating condition, transient condition and idle speed condition. Further more, the architectures of these models and the general simulating processes was described. The results show that the controller can choose the relevant controller for different operating condition automatically; the air/fuel ratio reaches the expected value; the controller has better control performance and reference value; this can be the basic of the electric control system for further study.