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

Taixiong Zheng, Bin Yang, Yongfu Li and Ying Ma
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Taixiong Zheng: School of Advanced Manufacturing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
Bin Yang: School of Advanced Manufacturing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
Yongfu Li: School of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
Ying Ma: School of Advanced Manufacturing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Energies, 2019, vol. 12, issue 22, 1-19

Abstract: In order to keep the ammonia (NH 3 ) slip of the downstream selective catalytic reduction (SCR) system at a low level and simultaneously achieve a high nitrogen oxide (NO X ) 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.

Keywords: Backstepping control; diesel engine; Luenberger-sliding mode observer; SCR system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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