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Vehicle NOx emission regulations are becoming more and more stringent worldwide. A selective catalytic reduction (SCR) system which uses ammonia as the reductant to reduce tailpipe NOx emissions is widely adopted by Diesel engine applications. For SCR control, a NOx sensor is commonly used to monitor the emissions, however it has been discovered that NOx sensors typically are cross-sensitive to the...
This paper describes a diesel engine lean NOx trap (LNT) regeneration control system using a nonlinear model predictive control (NMPC) technique. A two-level NMPC architecture is proposed for the LNT regenerations. The control objective is to minimize the fuel penalty caused by LNT regenerations while keeping the tailpipe NOx emissions amount under the regulation level. A physically-based and experimentally-validated...
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