Smart Sensing and Decomposition of NOx and NH3 Components from Production NOx Sensor Signals

Jones, James C. Peyton; Geveci, Mert

doi:10.4271/2011-01-1157

Cited by 14 publications

(3 citation statements)

References 8 publications

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“…According to the measuring principle, the N O x sensor is sensitive to both NO and N O 2 . 24 The sensor has different sensitivity to those species due to their different oxygen content. N O 2 is a larger molecule, so there is higher resistance to its transport through the diffusion barrier between the exhaust gas and first cavity.…”

Section: Methodsmentioning

confidence: 99%

NOx sensor cross sensitivity model and simultaneous prediction of NOx and NH3 slip from automotive catalytic converters under real driving conditions

Plá

Piqueras

Bares

et al. 2020

International Journal of Engine Research

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This work presents the development of a model to capture the NOx sensors cross sensitivity behavior based on [Formula: see text] sensor cell temperature, as well as a model do predict the slip of the NOx and NH3 after the SCR catalyst, as a way to reduce the error in the exhaust emissions estimation needed for feedback SCR control strategies. The emissions prediction model is based on the different cross sensitivity behavior of two distinct NOx sensors. The proposed models were tested and compared on a fully instrumented engine test bench when applied in a Worldwide harmonized Light vehicles Test Cycle (WLTC) and a full map cycle. As a result, the proposed model showed for NOx sensors cross sensitivity estimation an overall improvement of 34.8% for sensor 1 and 31.0% for sensor 2, and in terms of emissions prediction an overall improvement of 36.3% for NOx and 45.5% for NH3 slip.

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Section: Methodsmentioning

confidence: 99%

NOx sensor cross sensitivity model and simultaneous prediction of NOx and NH3 slip from automotive catalytic converters under real driving conditions

Plá

Piqueras

Bares

et al. 2020

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…The models for NO X and NH 3 sensors were developed using the data acquired with the available NO X and NH 3 sensors. The NO X sensor model is based on the sensor model in reference [11].…”

Section: Scr Estimator Developmentmentioning

confidence: 99%

“…The NH 3 storage is modeled using two storage sites; site 1 participates in the NH 3 storage and NO X reduction whereas site 2 participates only in the storage of NH 3 through adsorption and desorption. The reactions considered in the EKF's SCR reduced order model are shown in Equations (1) to (11). The reduction of NO X takes place through three main reaction mechanisms: two standard reactions (Eq (6) and (7)), the fast reaction (Eq.…”

Section: Reactions Considered In the Modelmentioning

confidence: 99%

Experimental Studies for CPF and SCR Model, Control System, and OBD Development for Engines Using Diesel and Biodiesel Fuels

Johnson¹,

Naber²,

Parker³

et al. 2013

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The goal of this research is to develop both nonlinear and linear state estimation strategies for both SCR and DPF devices. Development of "device health" outputs, as a function of real-time estimated states and nominal-operation states is an objective. Proving stability and quantifying the accuracy of these methods will be a primary objective. Finally, developing rational metrics for comparing trade-offs of computational complexity and accuracy will be developed. The objective of this research was to develop estimators for DPF and SCR state estimation. The SCR state estimator is based on the high fidelity model in reference [4, 5]. The DPF state estimator is based on the high fidelity model in reference [6] SCR High Fidelity Model Development A high fidelity multi-step global kinetic SCR model is important for studying the kinetics of the SCR reactions and provides a basis for developing the SCR reduced order model and state estimator. The performance of the SCR models and state estimator are highly dependent on the kinetic model parameters. SCR reactor and engine experimental studies and model calibration to experimental data are necessary for developing the SCR high fidelity model and identifying the model parameters. The high fidelity SCR model was developed from an existing model calibrated to Fe-zeolite reactor data [7]. The model was modified for Cu-zeolite SCR by changing the mass transfer correlations and adding necessary reactions. The model considers of a 1-D single channel of the SCR catalyst which was axially divided into a series of axial elements. The model contains equations describing the mass transfer, heat transfer and a series of SCR chemical reactions. It simulates the species concentrations in both the gas phase and surface phase for NO, NO 2 , NH 3 and N 2 O gas and wall temperatures, as well as the NH 3 storage along the axial distance of the channel.

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Diesel Engine SCR Control: Current Development and Future Challenges

Yuan

Liu

Gao

2015

Emiss. Control Sci. Technol.

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Smart Sensing and Decomposition of NO_x and NH₃ Components from Production NO_x Sensor Signals

Cited by 14 publications

References 8 publications

NOx sensor cross sensitivity model and simultaneous prediction of NOx and NH3 slip from automotive catalytic converters under real driving conditions

NOx sensor cross sensitivity model and simultaneous prediction of NOx and NH3 slip from automotive catalytic converters under real driving conditions

Experimental Studies for CPF and SCR Model, Control System, and OBD Development for Engines Using Diesel and Biodiesel Fuels

Diesel Engine SCR Control: Current Development and Future Challenges

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