Physics based modeling of urea selective catalytic reduction systems

This thesis addresses control-oriented modeling of urea-selective catalytic reduction (SCR) after-treatment systems used for reducing NO, emission in diesel vehicles. Starting from first-principles, appropriate simplifications are made in the underlying energy and species equations to yield simple governing equations of the Urea-SCR. The resulting nonlinear partial differential equations are discretized and linearized to yield a family of linear finite-dimensional state-space models of the SCR at different operating points. It is shown that this family of models can be reduced to three operating regions that are classified based on the relative NO, and NH3 concentrations. Within each region, parametric dependencies of the system on physical mechanisms are derived. A further model reduction is shown to be possible in each of the three regions resulting in a second-order linear model with sufficient accuracy. These models together with structured parametric dependencies on operating conditions set the stage for a systematic advanced control design that can lead to a high NO, conversion efficiency with minimal peak-slip in NH3. All model properties are validated using simulation studies of a high fidelity nonlinear model of the Urea-SCR, and compared with experimental data from a flow-reactor.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2010

Author dc:creator

• Na, Hanbee

Advisor dc:contributor.advisor

• Anuradha M. Annaswamy.

• Mechanical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/61914

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/61914