| GAIN-SCHEDULING SELECTIVE CATALYTIC REDUCTION CONTROL
IN DIESEL ENGINES WITH SWITCHED H∞ CONTROLLERS |
| Jihoon Lim , Patrick Kirchen , Ryozo Nagamune |
| Department of Mechanical Engineering, University of British Columbia |
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| ABSTRACT |
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This paper proposes a gain-scheduling (GS) control strategy for selective catalytic reduction (SCR) systems in
diesel engines, to minimize both nitrogen oxides (NOX) emissions and ammonia (NH3) slip downstream of the SCR catalyst.
The proposed GS controller switches among multiple linear time-invariant H∞ controllers based on the engine’s operating
condition, and adopts three measurable GS parameters, that is, the amount of NOX entering the SCR catalyst, exhaust gas
temperature in the catalyst, and ammonia slip measurement. While switching surfaces for the first two GS parameters are
determined by simply dividing their operating ranges, to find optimal switching surfaces for the ammonia slip GS parameter,
a novel method called Violation-Time-based Decision method is proposed. The efficiency of the proposed GS SCR controller
is validated in simulations using real experimental data obtained from a diesel engine in the Non-Road-Transient Cycle
(NRTC). |
| Key Words:
Selective catalytic reduction, Nitrogen oxides emissions, Ammonia slip, Gain-scheduling control,
Switched H∞ control |
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Corresponding Author.
Ryozo Nagamune , Email. 
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