刘一鸣,曹姜,薛涛

合肥工业大学 机械与汽车工程学院

摘要：发动机工作过程具有复杂的不确定性、时变性和非线性且空燃比的传输存在着迟延，尤其在瞬态工况下波动剧烈，为提高空燃比的控制精度以及经济性和排放性，利用MATLAB/Simulink软件建立空燃比模糊PID控制算法，算法平台为dSPACE公司的MicroAutoBox，在NQ150N天然气发动机上进行了测试实验，实验结果分析表明，与经典PID算法相比，模糊PID控制算法在稳态工况下性能良好，在过渡工况下能明显改善空燃比控制效果。                                                        关键词: 模糊PID；dSPACE；空燃比；天然气发动机；

Abstract: The working process of a natural gas engine has factors of complex uncertainty, time-variation and nonlinear. Also, the transmission of the air-fuel ratio is delayed, and has fluctuation especially under transient conditions. In order to improve the control accuracy, the efficiency and the emissions of air-fuel ratio, we use MATLAB / Simulink software to establish a fuzzy PID control algorithm of the air-fuel ratio. The platform of algorithm is the MicroAutoBox designed by the company of dSpace. The test-experiments are done on NQ150N natural gas engines. Compared with the normal PID algorithm, the results of experiments show that the fuzzy PID algorithm has a better performance in the steady-state condition, significantly improving the effects of fuel ratio control under the transition condition.

Keywords:  Fuzzy PID; dSPACE; Air-fuel Ratio; CNG Engine;