气体燃料发动机空燃比的H∞控制

为了抑制外部扰动,改善空燃比控制精度,将H∞控制理论应用于气体燃料发动机空燃比控制系统中,通过对发动机空燃比控制系统的数学建模,进行H∞空燃比控制器的设计,然后对所设计出的H∞控制器进行仿真比较与实验测试。仿真与实验结果表明:H∞控制器能有效地提高系统的跟踪性、鲁棒稳定性与抗干扰能力,能改善稳定工况与过渡工况时发动机空燃比的控制精度。

Air-Fuel Ratio Control Using H∞ Theory on a Gaseous-Fuel Engine

In order to inhibit outside disturbances and improve control accuracy of air-fuel ratio(AFR),this paper introduces a theory for air-fuel ratio control on a gaseous-fuel engine.A controller for air-fuel ratio control is designed on the basis of mathematical model of the engine system.Then,simulation and experimental testing are executed with the designed controller.Simulation and experimental results show that the designed controller enhances the performance of tracking,robust stability and the ability of disturbance rejection effectively,and improves control accuracy of AFR under steady working condition and transient working condition.