Abstract
The powertrain of hybrid electric vehicles offers opportunities to increase the energy efficiency as well as to reduce hazardous tailpipe emissions. The concept of modelbased Integrated Powertrain Control (IPC) is proposed to come to a well balanced trade-off between energy management and emission management. Requirements on tailpipe emissions from type approval are included as hard constraints, whereas the remaining freedom is used to minimize the operational cost which is important for creating customer value. A case study is presented for a heavy duty hybrid electric vehicle with an SCR-deNOx aftertreatment system. As long as the temperature of the aftertreatment system is low, IPC focuses on emission management. When the aftertreatment system is sufficiently hot, the main objective of IPC becomes energy management. Simulation results demonstrate how IPC optimizes the trade-off between operational costs (comprising fuel use and AdBlue dosing) versus NOx emissions.
Keywords: Integrated powertrain control, Hybrid electric vehicle, Energy management, Emission management, SCR aftertreatment.