Nonlinear Internal Model Control of EGR Valve

The accurate position control of exhaust gas recirculation (EGR) valve is important for emission reduction in internal combustion engine. In this paper, a nonlinear internal model control strategy for the position control of a linear motion EGR valve is proposed to compensate the effect of rate-dependent hysteresis and derive accurate positioning of the EGR valve plug. The modeling procedure of the EGR valve is presented. Then, the design method of the nonlinear internal model control is depicted based on the obtained nonlinear model of the valve. Finally, the control experiment of the EGR valve is illustrated.