Urea-based selected catalytic reduction (SCR) systems are effective ways in diesel engine after-treatment systems to meet increasingly stringent emission regulations. To achieve high NOx reduction efficiency and low NH3 slip, the control of the SCR system becomes more challenging, especially in transient operating conditions with model uncertainties. To effectively address this issue, this paper proposed a compound control strategy with a switching mechanism between an active disturbance rejection (ADR) controller and a zero-input controller. The ADR controller estimates and rejects the total (internal and external) disturbances from the SCR system when the exhaust gas temperature is high and its variation is small. The zero-input controller is used to lower ammonia surface coverage ratio to avoid high ammonia slip when exhaust gas temperature suddenly rises. The proposed control strategy is validated through a high-fidelity GT-Power simulation for a light-duty diesel engine over steady states and federal test procedure (FTP-75) test cycle. Its effectiveness is demonstrated especially in rapidly transient conditions with model uncertainties.
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Research-Article
Compound Control Strategy Based on Active Disturbance Rejection for Selected Catalytic Reduction systems
Jinbiao Ning,
Jinbiao Ning
Department of Mechanical Engineering,
e-mail: ningj4@mcmaster.ca
McMaster University
,Hamilton, ON L8S 4L7
, Canada
e-mail: ningj4@mcmaster.ca
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Fengjun Yan
Fengjun Yan
1
Department of Mechanical Engineering,
e-mail: yanfeng@mcmaster.ca
McMaster University
,Hamilton, ON L8S 4L7
, Canada
e-mail: yanfeng@mcmaster.ca
1Corresponding author.
Search for other works by this author on:
Jinbiao Ning
Department of Mechanical Engineering,
e-mail: ningj4@mcmaster.ca
McMaster University
,Hamilton, ON L8S 4L7
, Canada
e-mail: ningj4@mcmaster.ca
Fengjun Yan
Department of Mechanical Engineering,
e-mail: yanfeng@mcmaster.ca
McMaster University
,Hamilton, ON L8S 4L7
, Canada
e-mail: yanfeng@mcmaster.ca
1Corresponding author.
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received March 31, 2014; final manuscript received October 7, 2014; published online December 10, 2014. Assoc. Editor: Gregory Shaver.
J. Dyn. Sys., Meas., Control. May 2015, 137(5): 051008 (9 pages)
Published Online: May 1, 2015
Article history
Received:
March 31, 2014
Revision Received:
October 7, 2014
Online:
December 10, 2014
Citation
Ning, J., and Yan, F. (May 1, 2015). "Compound Control Strategy Based on Active Disturbance Rejection for Selected Catalytic Reduction systems." ASME. J. Dyn. Sys., Meas., Control. May 2015; 137(5): 051008. https://doi.org/10.1115/1.4028790
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