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Diesel airpath controllers are required to deliver good tracking performancewhilst satisfying operational constraints and physical limitations of theactuators. Due to explicit constraint handling capabilities, model predictivecontrollers (MPC) have been successfully deployed in diesel airpathapplications. Previous MPC implementations have considered instantaneousconstraints on engine-out emissions in order to meet legislated emissionsregulations. However, the emissions standards are specified over a drive cycle,and hence, can be satisfied on average rather than just instantaneously,potentially allowing the controller to exploit the trade-off between emissionsand fuel economy. In this work, an MPC is formulated to maximise the fuelefficiency whilst tracking boost pressure and exhaust gas recirculation (EGR)rate references, and in the face of uncertainties, adhering to the input,safety constraints and constraints on emissions averaged over some finite timeperiod. The tracking performance and satisfaction of average emissionsconstraints using the proposed controller are demonstrated through anexperimental study considering the new European drive cycle.

Model Predictive Controller with Average Emissions Constraints for Diesel Airpath