This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Robust, Model-Based Urea Dosing Control for SCR Aftertreatment Systems using a Cross-Sensitive Tailpipe NOx Sensor
Technical Paper
2017-01-0938
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Sector:
Language:
English
Abstract
This article describes a NOx sensor based urea dosing control strategy for heavy-duty diesel aftertreatment systems using Selective Catalytic Reduction. The dosing control strategy comprises of a fast-response, model-based ammonia storage control system in combination with a long-timescale tailpipe-feedback module that adjusts the dosing quantity according to current aftertreatment conditions. This results in a control system that is robust to system disturbances such as biased NOx sensors and variations in AdBlue concentrations. The cross-sensitivity of the tailpipe NOx sensor to ammonia is handled by a novel, smart signal filter that can reliably identify the contributions of NOx and NH3 in the tailpipe sensor signal, without requiring an artificial perturbation of the dosing signal.
The tailpipe feedback module compares the signal from the cross-sensitive tailpipe NOx sensor to the modeled tailpipe sensor signal to estimate the measured and modeled NOx conversion and NH3 slip, without the need for an NH3 sensor. The difference between these measured and modeled quantities is used to adjust the dosing quantity to the aftertreatment system, thereby maintaining nominal performance of the aftertreatment system in the presence of disturbances. Simulation results are presented of the urea dosing control system covering a wide range of disturbances, demonstrating the robustness properties of the controlled system. The robust urea dosing control strategy was implemented on a rapid prototyping platform and tested on a state-of-the-art Euro VI engine and aftertreatment systems, confirming the expected performance and robustness properties.
Recommended Content
Authors
Citation
Hommen, G., Kupper, F., and Seykens, X., "Robust, Model-Based Urea Dosing Control for SCR Aftertreatment Systems using a Cross-Sensitive Tailpipe NOx Sensor," SAE Technical Paper 2017-01-0938, 2017, https://doi.org/10.4271/2017-01-0938.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Unnamed Dataset 3 |
Also In
References
- EPA 10 emission legislation https://www.epa.gov/emission-standards-reference-guide/epa-emission-standards-heavy-duty-highway-engines-and-vehicles
- Euro VI emissions legislation http://ec.europa.eu/environment/air/transport/road.htm
- Johnson , T. Diesel Emissions in Review SAE Int. J. Engines 4 1 143 157 2011 10.4271/2011-01-0304
- Skaf , Z. , Aliyev , T. , Shead , L. , and Steffen , T. The State of the Art in Selective Catalytic Reduction Control SAE Technical Paper 2014-01-1533 2014 10.4271/2014-01-1533
- Peyton Jones , J. and Geveci , M. Smart Sensing and Decomposition of NOx and NH3 Components from Production NOx Sensor Signals SAE Int. J. Engines 4 1 1393 1401 2011 10.4271/2011-01-1157
- Nieuwstadt , M. , Upadhyay , D. Control of Urea SCR Systems for US Diesel Applications Oil & Gas Science and Technology - Rev. IFP Energies nouvelles 66 2011 4 655 665
- Chih-Cheng Chou , Chia-Jui Chiang , Yu-Hsuan Su et al. Identification of Cross-Sensitivity of Smart NOx Sensors to Ammonia in Urea-Selective Catalyst Reduction Systems via Fast Fourrier Transform Sensors and Materials 26 5 2014 313 318
- Willems F. and Cloudt R. Experimental Demonstration of a New Model-Based SCR Control Strategy for Cleaner Heavy-Duty Diesel Engines Control Systems Technology, IEEE Transactions on 19 5 1305 1313 2011
- 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
- SIMCAT aftertreament modeling suite https://www.tassinternational.com/simcat
- Hannu Jääskeläinen , H. , Majewski W. A. Urea Dosing Control, Dieselnet https://www.dieselnet.com/tech/cat_scr_mobile_control.php
- Cloudt , R. , Saenen , J. , Eijnden , E. , and Rojer , C. Virtual Exhaust Line for Model-based Diesel Aftertreatment Development SAE Technical Paper 2010-01-0888 2010 10.4271/2010-01-0888