Integrated Powertrain Control to Meet Low CO2 Emissions for a Hybrid Distribution Truck With SCR-DeNOx System

This article presents a cost-based optimization strategy that explicitly deals with the requirements for fuel consumption and emissions. Based on the Integrated Powertrain Control (IPC) approach, the overall powertrain performance is optimized by integrated energy and emission management. The potential of this strategy is demonstrated for a parallel hybrid diesel truck with a Selective Catalytic Reduction (SCR) de-NO_x system. New results are presented for a challenging city cycle; although the average power demand is low, IPC is able to keep the SCR catalyst temperature relatively high. With this IPC approach, the CO₂-NO_x trade-off is optimized in a systematic way. It is demonstrated that CO₂ emissions and related operating costs are reduced by 3.5% or 24.9% NO_x emission reduction is achieved, depending on the applied IPC calibration.