Journal ArticleDOI
Ammonia sensor for closed-loop SCR control
Da Yu Wang,Sheng Yao,Mark A. Shost,Joon-Ho Yoo,David D. Cabush,David M. Racine,Robert Cloudt,Frank Willems +7 more
TLDR
In this article, an ammonia sensor has been developed for use as a feedback element in closed-loop control of urea dosing in a diesel SCR aftertreatment system, which enables the SCR system to be robust against disturbances and to meet conformity of production (COP) and in-use compliance norms.Abstract:
Selective Catalytic Reduction (SCR) is the dominant solution for meeting future NOx reduction regulations for heavy-duty diesel powertrains. SCR systems benefit from closed-loop control if an appropriate exhaust gas sensor were available. An ammonia sensor has recently been developed for use as a feedback element in closed-loop control of urea dosing in a diesel SCR aftertreatment system. Closed-loop control of SCR dosing enables the SCR system to be robust against disturbances and to meet conformity of production (COP) and in-use compliance norms.read more
Citations
More filters
Journal ArticleDOI
A review of mixed-potential type zirconia-based gas sensors
TL;DR: In this paper, the development of mixed-potential type gas sensors with combined yttria-stabilized zirconia (YSZ) as the base solid electrolyte material and various classes of electrode materials for their potential utilization as a high-performance sensing electrode is discussed.
Journal ArticleDOI
Selective Mixed Potential Ammonia Exhaust Gas Sensor
TL;DR: In this article, a novel selective ammonia sensor with high potential for long-term stability in harsh exhaust environments is introduced, which is based on the mixed potential effect, and the sensor signal depends semi-logarithmic on ammonia.
Journal ArticleDOI
Mixed-potential type NH3 sensor based on stabilized zirconia and Ni3V2O8 sensing electrode
Fangmeng Liu,Ruize Sun,Yehui Guan,Xiaoyang Cheng,Han Zhang,Yingzhou Guan,Xishuang Liang,Peng Sun,Geyu Lu +8 more
TL;DR: In this article, a mixedpotential type gas sensor using stabilized zirconia (YSZ) and a sensing electrode (SE) consisting of the new type composite oxide Ni3V2O8 was developed for ammonia (NH3) detection at elevated temperature, such as 650°C.
Journal ArticleDOI
A Two-Cell Backstepping-Based Control Strategy for Diesel Engine Selective Catalytic Reduction Systems
Ming-Feng Hsieh,Junmin Wang +1 more
TL;DR: A nonlinear backstepping-based control law is proposed to regulate the ammonia coverage ratio of the upstream cell to a desired (high) value in order to maintain high-SCR NOx conversion efficiency and guarantee low ammonia slip, as well as being robust to the SCR ammonia storage capacity uncertainty.
References
More filters
Proceedings ArticleDOI
Model-based Closed-loop Control of Urea SCR Exhaust Aftertreatment System for Diesel Engine
Qingwen Song,George Guoming Zhu +1 more
TL;DR: An innovative closedloop control architecture is introduced, which combines model-based feedforward control with variable gainscheduling feedback control, and the steady-state response is improved with the closed-loop control.