This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development of Model Predictive Control Strategy of SCR System for Heavy-Duty Diesel Engines with a One-State Control-Oriented SCR Model
Technical Paper
2018-01-1763
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
Urea-based selective catalytic reduction (SCR) of nitric oxides (NOx) is a key technology for heavy-duty diesel engines to achieve the increasingly stringent NOx emission standards. The aqueous urea injection control is critical for urea-SCR systems in order to achieve high NOx conversion efficiency while restricting the tailpipe ammonia (NH3) slip. For Euro VI emission regulation, an advanced control strategy is essential for SCR systems since its NOx emission limits are tighter and test procedure are more stringent compared to Euro IV and Euro V. The complex chemical kinetics of the SCR process has motivated model-based control design approaches. However, the model is too complex to allow real-time implementation. Therefore, it is very important to have a reduced order model for SCR control system.
Based on a continuous stirred tank reactor (CSTR) and mass conservation law, a one-State control-oriented SCR model was developed and validated to estimate the downstream NOx emission, NH3 slip, and NH3 storage of the SCR catalyst. A model predictive control (MPC) coupled to the control-oriented SCR model was established to control the urea injection rate and maintain the NH3 storage at a required level.
The control-oriented SCR model can capture the main dynamics of the steady state condition as well as the transient condition very well, and the NOx emissions, NH3 storage, and NH3 slip can be well predicted. With the MPC, the simulation results showed that the NH3 storage in the SCR catalyst could be well controlled, the NOx emission in the world harmonized transient cycle (WHTC) after the SCR system of a heavy-duty diesel engine with raw NOx emission at 8.66 g/kW·h was reduced to about 0.37 g/kW·h, and the averaged NOx conversion efficiency was up to 96%, while the averaged NH3 slip in the cycle was kept below 10 ppm, which met the requirements of the Euro VI emission regulation.
Authors
- Guoyang Wang - Shandong University
- Hafiz Liaqat Ali - Tsinghua University
- Jun Zhang - Tsinghua University
- Jinzhu Qi - Tsinghua University
- Yang Liu - Tsinghua University
- Shiyu Liu - Tsinghua University
- Kaiyuan Cai - Tsinghua University
- Shi-Jin Shuai - Tsinghua University
- Zhiming Wang - Shandong University
Topic
Citation
Wang, G., Ali, H., Zhang, J., Qi, J. et al., "Development of Model Predictive Control Strategy of SCR System for Heavy-Duty Diesel Engines with a One-State Control-Oriented SCR Model," SAE Technical Paper 2018-01-1763, 2018, https://doi.org/10.4271/2018-01-1763.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Unnamed Dataset 3 | ||
Unnamed Dataset 4 | ||
Unnamed Dataset 5 | ||
Unnamed Dataset 6 | ||
Unnamed Dataset 7 |
Also In
References
- Zhao , J. et al. Urea-SCR Process Control for Diesel Engine Using Feedforward-Feedback Nonlinear Method IFAC-PapersOnLine 48 8 367 372 2015
- Guan , B. et al. Review of State of the Art Technologies of Selective Catalytic Reduction of NOx, from Diesel Engine Exhaust Applied Thermal Engineering 66 1-2 395 414 2014
- Praveena , V. and Martin , M.L.J. x Journal of the Energy Institute 2017
- Johnson , T. Vehicular Emissions in Review SAE Int. J. Engines 6 2 699 715 2013 10.4271/2013-01-0538
- Bonfils , A. x 3 Advanced Control of Chemical Processes 738 743 2012
- 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 10.4271/2002-01-0287
- Willems , F. , Cloudt , R. , van den Eijnden , E. , van Genderen , M. et al. Is Closed-Loop SCR Control Required to Meet Future Emission Targets? SAE Technical Paper 2007-01-1574 2007 10.4271/2007-01-1574
- Aliramezani , M. , Koch , C.R. , and Hayes , R.E. Estimating Tailpipe NO x Concentration using a Dynamic NO x /Ammonia Cross Sensitivity Model Coupled to a Three State Control Oriented SCR Model IFAC-PapersOnLine 49 11 8 13 2016
- Wang , D.Y. , Yao , S. , Shost , M. , Yoo , J. et al. Ammonia Sensor for Closed-Loop SCR Control SAE Int. J. Passeng. Cars - Electron. Electr. Syst. 1 1 323 333 2008 10.4271/2008-01-0919
- Shost , M. , Noetzel , J. , Wu , M. , Sugiarto , T. et al. Monitoring, Feedback and Control of Urea SCR Dosing Systems for NOx Reduction: Utilizing an Embedded Model and Ammonia Sensing SAE Technical Paper 2008-01-1325 2008 10.4271/2008-01-1325
- Krejza , P. , Pekar , J. , Figura , J. , Lansky , L. et al. Cascade MPC Approach to Automotive SCR Multi-Brick Systems WCX™ 17: SAE World Congress Experience Detroit, MI 2017
- Mckinley , T.L. and Alleyne , A.G. Model Predictive Control: A Unified Approach for Urea-Based SCR Systems SAE Int. J. Fuels Lubr. 3 1 673 689 2015 10.4271/2010-01-1184
- Upadhyay , D. and Nieuwstadt , M.V. Model Based Analysis and Control Design of a Urea-SCR deNO x Aftertreatment System Journal of Dynamic Systems Measurement & Control 128 3 737 741 2006
- Hsieh , M.F. and Wang , J. Development and Experimental Studies of a Control-Oriented SCR Model for a Two-Catalyst Urea-SCR System Control Engineering Practice 19 4 409 422 2011
- Lietti , L. , Nova , I. , Tronconi , E. , and Forzatti , P. Transient Kinetic Study of the SCR-DeNO x Reaction Catalysis Today 45 85 92 1998
- Wurzenberger , J. and Wanker , R. Multi-Scale SCR Modeling, 1D Kinetic Analysis and 3D System Simulation SAE Technical Paper 2005-01-0948 2005 10.4271/2005-01-0948
- Upadhyay , D. and Nieuwstadt , M.V. Modeling of a Urea SCR Catalyst with Automotive Applications ASME 2002 International Mechanical Engineering Congress and Exposition 2002 707 713
- Joshi , S.Y. et al. Applied Catalysis B Environmental 2018
- Hsieh , M.F. and Wang , J. NO and NO 2 Concentration Modeling and Observer-Based Estimation Across a Diesel Engine Aftertreatment System SME Transactions-Journal of Dynamic Systems, Measurement, and Control 133 2
- Krejza , P. , Pekar , J. , Figura , J. , Lansky , L. et al. Cascade MPC Approach to Automotive SCR Multi-Brick Systems WCX™ 17: SAE World Congress Experience Detroit, MI 2017
- Wang , G. , Zhang , J. , Yang , B. , Li , C. et al. Development of Model Based Closed Loop Control Strategy of SCR System for Heavy-Duty Diesel Engines SAE Technical Paper 2017-01-2383 2017 10.4271/2017-01-2383