Control Design of Electrically Assisted Boosting Systems for Diesel Powertrain Applications

In this paper, we investigate the control design problem associated with the use of an electrically assisted turbo-charger (TC) for a modern Diesel engine plant. It is shown that the proposed system has the potential of improving the control bandwidth of air charge regulation relative to conventional systems. The improved control authority creates the potential for precise regulation of the fresh air fraction in the air charge. A previously developed model of a Diesel engine with variable geometry turbocharging (VGT) and Exhaust Gas Recirculation (EGR) is augmented with the model of a permanent magnet synchronous motor (PMSM) to create the model of the Turbo Electrical Assist (TEA) system. The effect of exhaust gas recirculation (EGR) on the electric power requirement of the PMSM is examined over a federal test procedure (FTP) test drive cycle. Control design is performed using the sliding mode framework.