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Open AccessArticle

Luenberger-Sliding Mode Observer Based Backstepping Control for the SCR System in a Diesel Engine

1
School of Advanced Manufacturing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2
School of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(22), 4270; https://doi.org/10.3390/en12224270
Received: 25 October 2019 / Revised: 4 November 2019 / Accepted: 7 November 2019 / Published: 8 November 2019
(This article belongs to the Section Energy and Environment)
In order to keep the ammonia (NH3) slip of the downstream selective catalytic reduction (SCR) system at a low level and simultaneously achieve a high nitrogen oxide (NOX) conversion rate, a Luenberger-sliding mode observer based backstepping control method is proposed. Considering that the internal working condition of the catalyst cannot be measured by commercial sensors directly, a Luenberger-sliding mode observer is designed to estimate the ammonia concentration at the middle of the catalyst. In addition, based on the stepped distributed characteristic of the surface ammonia coverage ratio along the SCR axial direction, a backstepping control method is utilized for the SCR system, in which the SCR system is decomposed into two subsystems. Firstly, the Lyapunov function is designed to ensure the convergence of the downstream subsystem, and then the virtual control law is obtained. After that, taking the virtual control law as the tracking target of the upstream subsystem, the Lyapunov function of virtual control law is given. Finally, the actual control law of the whole closed loop system is acquired. Simulations under different conditions are conducted to investigate the effect of the proposed control method. In addition, comparisons with the traditional PID (Proportion Integration Differentiation) control are presented. Results show that the proposed method is much better than the PID control method in overshoot, setting time, and tracking error. View Full-Text
Keywords: Backstepping control; diesel engine; Luenberger-sliding mode observer; SCR system Backstepping control; diesel engine; Luenberger-sliding mode observer; SCR system
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MDPI and ACS Style

Zheng, T.; Yang, B.; Li, Y.; Ma, Y. Luenberger-Sliding Mode Observer Based Backstepping Control for the SCR System in a Diesel Engine. Energies 2019, 12, 4270.

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