This paper presents two observers for estimating the aging condition of selective catalytic reduction (SCR) systems in vehicle applications. SCR systems have been widely recognized as one of the leading engine exhaust gas aftertreatment systems for reducing diesel powertrain tailpipe NOx emissions in ground vehicle applications. While fresh SCRs are quite effective in reducing tailpipe NOx emissions, their NOx reduction capabilities and performances may substantially degrade with in-service aging. To maintain the emission control performance of a SCR system for a diesel engine during the entire vehicle service life, it is thus critical to have an accurate estimation of the SCR system aging condition. In this paper, two Lyapunov-based observers utilizing the measurements of NOx and ammonia concentrations are analytically developed and verified in simulations for estimating the SCR aging condition. The measurement uncertainty is explicitly considered in the observer design process. A sufficient condition for the boundedness of the estimation error is derived. Simulation results under the US06 test cycle demonstrate the effectiveness of the proposed observers.
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February 2017
Research-Article
Observer-Based Estimation of Aging Condition for Selective Catalytic Reduction Systems in Vehicle Applications
Yao Ma,
Yao Ma
Department of Mechanical
and Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: ma.506@osu.edu
and Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: ma.506@osu.edu
Search for other works by this author on:
Junmin Wang
Junmin Wang
Fellow ASME
Department of Mechanical
and Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: wang.1381@osu.edu
Department of Mechanical
and Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: wang.1381@osu.edu
Search for other works by this author on:
Yao Ma
Department of Mechanical
and Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: ma.506@osu.edu
and Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: ma.506@osu.edu
Junmin Wang
Fellow ASME
Department of Mechanical
and Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: wang.1381@osu.edu
Department of Mechanical
and Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: wang.1381@osu.edu
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received January 21, 2016; final manuscript received August 5, 2016; published online October 20, 2016. Assoc. Editor: Ardalan Vahidi.
J. Dyn. Sys., Meas., Control. Feb 2017, 139(2): 021002 (9 pages)
Published Online: October 20, 2016
Article history
Received:
January 21, 2016
Revised:
August 5, 2016
Citation
Ma, Y., and Wang, J. (October 20, 2016). "Observer-Based Estimation of Aging Condition for Selective Catalytic Reduction Systems in Vehicle Applications." ASME. J. Dyn. Sys., Meas., Control. February 2017; 139(2): 021002. https://doi.org/10.1115/1.4034508
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