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International Journal of Automotive Technology > Volume 22(3); 2021 > Article
International Journal of Automotive Technology 2021;22(3): 811-821.
doi: https://doi.org/10.1007/s12239-021-0074-7
Jihoon Lim1,2, Patrick Kirchen1, Youngdeok Han2, Ryozo Nagamune1
1University of British Columbia
2Doosan Infracore
PDF Links Corresponding Author.  Ryozo Nagamune , Email. nagamune@mech.ubc.ca
This paper proposes a discrete-time preview-feedback controller capable of reducing nitrogen oxide () emissions with affordably low ammonia () slip downstream of a catalyst for selective catalytic reduction (SCR) systems. Because of the high  reduction rate, SCR systems are increasingly adopted in diesel engines. However, slow dynamics of the SCR system along with a time delay in the sensor result in a challenging control problem. To overcome the control challenges, the preview-feedback controller is proposed under the assumption that the  disturbance is previewed. To design the preview-feedback  controller, a discrete-time generalized plant is derived by combining the linearized model of SCR system, the model for previewing disturbance signal, and the weighting function. Based on experimentally obtained data, the simulations show that the proposed controller can effectively reduce 34 % of  emissions and 6 % of  slip more, compared to a non-preview controller. The robustness is then demonstrated using the uncertainties ranging from 10 to 40 %. This result shows that uncertainties of up to 30 % do not negatively affect the performance. Additionally, the result for the computational requirement shows that the proposed controller yields better performance with lower computation time than a model predictive controller does.
Key Words: Diesel engine,  control, Nitrogen oxides, Preview-feedback control, Selective catalytic reduction, Ammonia slip
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