Development and Application of a Fast Quasi-Steady Solver for Integrated Modeling of Exhaust Aftertreatment Systems

Syed  Wahiduzzaman, Gamma Technologies

Syed Wahiduzzaman, Weiyong Tang and Seth Wenzel
Gamma Technologies, Westmont, Illinois

Engines/vehicle systems are becoming increasing complex partly due to the incorporation of emission abatement components that are technologically evolving to keep up with emissions requirements. This makes the testing and verification with actual prototypes prohibitively expensive and time-consuming. Consequently, there is an increasing reliance on Software-In-the-Loop (SIL) and Hardware-In-the-Loop (HIL) simulations for design evaluation of system concepts. However, it is frequently the case that the numerical burden of the aftertreatment system model involving is the main bottleneck in SIL/HIL compatible system model. In this study implementation and use of fast Quasi-steady (QS) solver will be demonstrated. This new approach is capable of simulating AT systems at speeds of 10-100 times faster than real time. To demonstrate the applicability of this method, several case studies have been conducted: (a) development of an intrinsic SCR mechanistic model from micro-reactor measurements with V2O5-WO3/TiO2 catalysts; (b) kinetic calibration and emissions prediction for a green and aged DOC; and (c) simulation of a system level AT model consisting of a fuel reformer, a LNT, a DPF and a SCR for NOx control. Kinetic analyses, simulation results and comparisons to experiments are presented and discussed.

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