Unconstrained NCGPC and Asymptotic Tracking applied to the tracking problem for a Turbocharged Diesel Engine: A comparative study

This paper presents a comparative study between unconstrained nonlinear continuous-time generalized predictive control (NCGPC) and asymptotic tracking applied to the tracking problem for a turbocharged diesel engine (TDE). Our goal is to control the emissions of diesel engines equipped with two actuators: exhaust gas recirculation (EGR) valve and variable geometry turbocharger (VGT). To achieve this, we propose to control air fuel ratio (AFR) and EGR fraction. But these variables are not accessible for measurements. Therefore the gas pressure in the intake manifold and the compressor mass flow rate are preferred. Nevertheless, with these outputs, one runs up against a non-minimum phase system. To avoid this, a change of the vector output is done with a dynamic extension. Simulation results are presented to highlight efficiency of both controllers.