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Model-based Closed-loop Control of Urea SCR Exhaust Aftertreatment System for Diesel Engine
Technical Paper
2002-01-0287
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Based on our error budget analysis, the urea SCR aftertreatment system is uncontrollable under EPA 2007-emission level without an effective closed-loop control strategy. The objective of the closed-loop control is to improve transient response as well as reduce the steady state control error. But the inherent large dead time in the urea SCR aftertreatment system makes the closed-loop control a challenge. In this paper, an innovative closed-loop control architecture is introduced, which combines model-based feedforward control with variable gain-scheduling feedback control. Transient response is improved with the inverse-dynamic feedforward control and the variable-gain closed-loop control. The steady-state response is improved with the closed-loop control. Based on this new strategy, a controller is designed and validated under the simulation and test cell environment. Comparison with the baseline open-loop controller is also conducted. Finally, some conclusions are presented.
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Citation
Song, Q. and Zhu, G., "Model-based Closed-loop Control of Urea SCR Exhaust Aftertreatment System for Diesel Engine," SAE Technical Paper 2002-01-0287, 2002, https://doi.org/10.4271/2002-01-0287.Also In
Diesel Exhaust Emissions Control 2002: SCR, HC De-NOx, and Measurement
Number: SP-1674; Published: 2002-03-04
Number: SP-1674; Published: 2002-03-04
References
- Havenith Cornelis etc. “Development of a Urea DeNOx Catalyst Concept for European Ultra-Low Emission Heavy-Duty Diesel Engines” SAE paper 952652
- Miller William R. etc. “The Development of Urea-SCR Technology for US Heavy Duty Trucks SAE paper 2000-01-0190
- Khair Magdi Lemaire Jacques Fischer Stefan “Integration of Exhaust Gas Recirculation, Selective Catalytic Reduction, Diesel Particulate Filters, and Fuel-Borne Catalyst for Nox/PM Reduction” SAE paper 2000-01-1933
- Warren James P. “Diesel Aftertreatment Systems: 2004 - 2007, A Cost Assessment” SAE paper 2001-01-1948