Integrated emission management for cost optimal EGR-SCR balancing in diesels

The potential of a cost-based optimization method is experimentally demonstrated on a Euro-VI heavy-duty diesel engine. Based on the actual engine-aftertreatment state, this model-based Integrated Emission Management (IEM) strategy minimizes operational (fuel and AdBlue) costs within emission constraints by real-time computation of optimal air management set points. This work discusses the control design in detail. By EGR-SCR balancing, fuel consumption and operational costs are reduced by 2.1% and 1.5%, respectively, compared to the baseline strategy over the hot World Harmonized Transient Cycle. Due to its adaptation characteristics, the IEM strategy is robust for varying conditions during real-world operation.