中文摘要：

为克服瞬态工况下油膜动态特性对空燃比控制精度的影响,提出了一种二阶滑模空燃比控制策略。通过对发动机平均值模型的分析,确定其作为单输入单输出（SISO）系统的非线性形式,设计了基于Super-twisting算法的二阶滑模空燃比控制器并运用Matlab建模仿真。仿真结果表明,基于Super-twisting算法的二阶滑模控制器鲁棒性强;与PID控制器和一阶滑膜控制器相比较,控制精度和速度明显提高。

英文摘要：

To offset the effects of fuel film dynamics on the accuracy of transient AFR control,a second-order sliding mode control scheme for AFR control is presented. By analyzing the Mean Value Engine Model of gasoline engine as a single-input single-output（SISO） system,the scheme determines a generalized non-linear system,and then designs an AFR controller based on second-order sliding mode with Super-twisting algorithm. The corresponding simulation is carried on the Matlab. The results show that the designed AFR controller has strong robustness,and its control accuracy and stability are obviously better than PID controller and traditional sliding mode controller.