The Experts below are selected from a list of 22641 Experts worldwide ranked by ideXlab platform
Junmin Wang - One of the best experts on this subject based on the ideXlab platform.
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Sliding-mode control of automotive Selective Catalytic Reduction systems with state estimation:
Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, 2019Co-Authors: Junmin WangAbstract:A sliding-mode controller for an automotive Selective Catalytic Reduction system is designed to drive its ammonia surface coverage ratio to the target level. The proposed controller only requires N...
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Adaptive control of two-cell Selective Catalytic Reduction systems
2015 54th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE), 2015Co-Authors: Hui Zhang, Junmin WangAbstract:In this work, we investigate the integrated study of closed-loop control for Diesel engine two-cell Selective Catalytic Reduction (SCR) systems. With the generated references, an adaptive backstepping controller is adopted to control the two-cell SCR system. Experimental tests are carried out for the US06 test cycle. It infers from the test results that the control performance with the designed dynamic generators has some advantages over the performance with constant references and the lumped case.
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Sliding-mode observers for urea Selective Catalytic Reduction system state estimations based on nitrogen oxide sensor measurements
Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, 2014Co-Authors: Pingen Chen, Junmin WangAbstract:The state estimations for urea-based Selective Catalytic Reduction systems have received growing interest in the past few years because of their importance to Selective Catalytic Reduction controls and onboard diagnostics, as well as the high cost and difficulties of direct sensor measurements. Most of the existing estimation techniques suffer because of the ammonia cross-sensitivity from the nitrogen oxide sensor and require an ammonia sensor to be available downstream of the Selective Catalytic Reduction, which may increase the costs of production urea-based Selective Catalytic Reduction systems. The purpose of this study is to design observers for estimating the key states (the nitrogen oxide concentration, the ammonia concentration, and the ammonia coverage ratio) of the urea-based Selective Catalytic Reduction system at the Selective Catalytic Reduction outlet in various situations, using only a nitrogen oxide sensor. The sliding-mode observers were designed to ensure high robustness against the ammonia cross-sensitivity from the nitrogen oxide sensor and uncertainties from the Selective Catalytic Reduction inputs. Simulation verification results under the Federal Test Procedure 75 test cycle showed that the proposed observers were able to estimate the states accurately, in hot and cold exhaust conditions, for both single-cell Selective Catalytic Reduction systems and two-cell Selective Catalytic Reduction systems. The proposed observer-based estimation technique has the potential for reducing the cost of advanced Selective Catalytic Reduction control systems and for applying it to onboard diagnostics.
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A novel cost-effective robust approach for Selective Catalytic Reduction state estimations using dual nitrogen oxide sensors
Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, 2014Co-Authors: Pingen Chen, Junmin WangAbstract:Urea-based Selective Catalytic Reduction systems have become a promising technique in controlling nitrogen oxide emissions from diesel engines in the past decade. One of the continuing issues is the cross-sensitivity characteristics of the current nitrogen oxide sensors to ammonia in the exhaust, which makes nitrogen oxide sensor readings inaccurate in the presence of ammonia. Although prototype ammonia sensors for mobile Selective Catalytic Reduction applications have been introduced for diesel emission control in the past few years, ammonia sensors are still too expensive to be available for mass-produced diesel engines and Selective Catalytic Reduction systems. In order to address these issues, in this paper, a novel, cost-effective, and robust approach is proposed for estimating the key Selective Catalytic Reduction states including the nitric oxide concentration, the nitrogen dioxide concentration, the ammonia concentration, and the ammonia surface coverage ratio, by utilizing two post-Selective-Catalytic-Reduction nitrogen oxide sensors with different ammonia cross-sensitivity factors. Experimental verification results show that the proposed approach has the potential for precisely estimating the four Selective Catalytic Reduction states. Such a novel approach can be instrumental in reducing the cost of Selective Catalytic Reduction diagnosis, Selective Catalytic Reduction estimation, and advanced Selective Catalytic Reduction controls.
Changbin Zhang - One of the best experts on this subject based on the ideXlab platform.
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novel cerium tungsten mixed oxide catalyst for the Selective Catalytic Reduction of nox with nh3
Chemical Communications, 2011Co-Authors: Wenpo Shan, Hong He, Changbin ZhangAbstract:A novel Ce–W mixed oxide catalyst prepared by homogeneous precipitation method presented nearly 100% NOx conversion in a wide temperature range from 250 to 425 °C for the Selective Catalytic Reduction of NOx with NH3 under an extremely high GHSV of 500 000 h−1.
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Selective Catalytic Reduction of no by nh3 over a ce tio2 catalyst
Catalysis Communications, 2008Co-Authors: Changbin ZhangAbstract:Abstract Samples of cerium supported on titania with different Ce loadings have been prepared by an impregnation method and tested for the Selective Catalytic Reduction of NO by NH 3 in the presence of excess oxygen. The catalysts with 5% Ce and above had high activity in the temperature range 275–400 °C at a space velocity of 50,000 h −1 . All the catalysts showed an excellent selectivity to N 2 and high tolerance to SO 2 and H 2 O under our test conditions.
P. Grange - One of the best experts on this subject based on the ideXlab platform.
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Selective Catalytic Reduction of NO by NH3 on titanium pillared montmorillonite
Catalysis Letters, 1996Co-Authors: H. L. Del Castillo, A. Gil, P. GrangeAbstract:The acidity of a titanium pillared montmorillonite (Ti-PILC) has been modified by two methods of sulfation. The acidic properties of these pillared clays have been studied by temperature-programmed ammonia desorption and FTIR analysis of pyridine adsorption. The Catalytic activity of these titanium pillared clays in the Selective Catalytic Reduction (SCR) of NO by NH3 with or without SO2 has been investigated. For the three titanium pillared clays, a high resistance to SO2 presence has been observed.
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Selective Catalytic Reduction of NO by NH3 on titanium pillared montmorillonite
Catalysis Letters, 1996Co-Authors: H. L. Del Castillo, A. Gil, P. GrangeAbstract:The acidity of a titanium pillared montmorillonite (Ti-PILC) has been modified by two methods of sulfation. The acidic properties of these pillared clays have been studied by temperature-programmed ammonia desorption and FTIR analysis of pyridine adsorption. The Catalytic activity of these titanium pillared clays in the Selective Catalytic Reduction (SCR) of NO by NH3 with or without SO2 has been investigated. For the three titanium pillared clays, a high resistance to SO2 present has been observed
H. L. Del Castillo - One of the best experts on this subject based on the ideXlab platform.
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Selective Catalytic Reduction of NO by NH3 on titanium pillared montmorillonite
Catalysis Letters, 1996Co-Authors: H. L. Del Castillo, A. Gil, P. GrangeAbstract:The acidity of a titanium pillared montmorillonite (Ti-PILC) has been modified by two methods of sulfation. The acidic properties of these pillared clays have been studied by temperature-programmed ammonia desorption and FTIR analysis of pyridine adsorption. The Catalytic activity of these titanium pillared clays in the Selective Catalytic Reduction (SCR) of NO by NH3 with or without SO2 has been investigated. For the three titanium pillared clays, a high resistance to SO2 presence has been observed.
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Selective Catalytic Reduction of NO by NH3 on titanium pillared montmorillonite
Catalysis Letters, 1996Co-Authors: H. L. Del Castillo, A. Gil, P. GrangeAbstract:The acidity of a titanium pillared montmorillonite (Ti-PILC) has been modified by two methods of sulfation. The acidic properties of these pillared clays have been studied by temperature-programmed ammonia desorption and FTIR analysis of pyridine adsorption. The Catalytic activity of these titanium pillared clays in the Selective Catalytic Reduction (SCR) of NO by NH3 with or without SO2 has been investigated. For the three titanium pillared clays, a high resistance to SO2 present has been observed
Seok Ho Jeon - One of the best experts on this subject based on the ideXlab platform.
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heterogeneous mercury reaction on a Selective Catalytic Reduction scr catalyst
Catalysis Letters, 2008Co-Authors: Seok Ho JeonAbstract:The heterogeneous mercury reaction mechanism, reactions among elemental mercury (Hg0) and simulated flue gas across laboratory-scale Selective Catalytic Reduction (SCR) reactor system was studied. The surface of SCR catalysts used in this study was analyzed to verify the proposed reaction pathways using transmission electron microscopy with energy dispersive X-ray analyses (TEM-EDX) and X-ray photoelectron spectroscopy (XPS). The Langmuir–Hinshelwood mechanism was proven to be most suitable explaining first-layer reaction of Hg0 and HCl on the SCR catalyst. Once the first layer is formed, successive layers of oxidized mercury (HgCl2) are formed, making a multi-layer structure.
