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control-oriented model With Intra-Patient Variations for an Artificial Pancreas

IEEE JOURNAL OF BIOMEDICAL AND HEALTH INFORMATICS 2020年第9期24卷 2681-2689页

作者： Moscoso-Vasquez, Marcela Colmegna, Patricio Rosales, Nicolas Garelli, Fabricio Sanchez-Pena, Ricardo Inst Tecnol Buenos Aires ITBA Ctr Sistemas & Control C1106ACD Buenos Aires DF Argentina Consejo Nacl Invest Cient & Tecn CONICET C1425FQB Buenos Aires DF Argentina Univ Virginia UVA Ctr Diabet Technol Charlottesville VA 22903 USA Univ Nacl Quilmes UNQ Dept Ciencia & Tecnol B-1876 Bernal Argentina Univ Nacl La Plata CONICET LEICI CONICET B-1900 La Plata Argentina

In this work, a low-order model designed for glucose regulation in Type 1 Diabetes Mellitus (T1DM) is obtained from the UVA/Padova metabolic simulator. It captures not only the nonlinear behavior of the glucose-insulin system, but also intra-patient variations related to daily insulin sensitivity (S-I) changes. To overcome the large inter-subject variability, the model can also be personalized based on a priori patient information. The structure is amenable for linear parameter varying (LPV) controller design, and represents the dynamics from the subcutaneous insulin input to the subcutaneous glucose output. The efficacy of this model is evaluated in comparison with a previous control-oriented model which in turn is an improvement of previous models. Both models are compared in terms of their open- and closed-loop differences with respect to the UVA/Padova model. The proposed model outperforms previous T1DM control-oriented models, which could potentially lead to more robust and reliable controllers for glycemia regulation.

关键词： Intra-patient variations LPV model type 1 diabetes control-oriented model artificial pancreas

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control-oriented model of a solar community with seasonal thermal energy storage: development, calibration and validation

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JOURNAL OF BUILDING PERFORMANCE SIMULATION 2019年第5期12卷 523-545页

作者： Saloux, Etienne Candanedo, Jose A. Nat Resources Canada CanmetENERGY 1615 Blvd Lionel Boulet Varennes PQ J3X 1P7 Canada

The development of a control-oriented model of a solar community with seasonal storage (the Drake Landing Solar Community) is investigated. The proposed approach, intended to facilitate the development and testing of control strategies and targeting an actual predictive control implementation, is based on grey-box models, and enables the prediction of the system state (temperatures at key locations). This paper discusses the concept of state update procedure (whereby the system state is periodically corrected with measurements), which plays a fundamental role for control purposes. Firstly, the DLSC is presented and both operation and monitoring system are described. Secondly, a simplified model is developed for each sub-system: district and solar loops, short-term (water tanks) and seasonal (borehole) thermal energy storage, and existing operation rules are encoded. Finally, the model is calibrated and validated by using measurements at 10-min intervals over two years of operation (2015-2016, 2016-2017) and accurately predicts the system performance.

关键词： control-oriented model district heating model predictive control solar community thermal energy storage solar collectors

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A control-oriented model Identification for Air Path System of Diesel Engines

A Control-oriented Model Identification for Air Path System ...

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第三十九届中国控制会议

作者： Zhijian Wang Xinda Yang Jingfei Zhang Jingyu Zhang Yuhu Wu R & D Center Weichai Power Co.Ltd School of Control Science and Engineering Dalian University of Technology

In this paper, an air path model of diesel engine is developed, parameterized, and validated. In order to promote the design of model-based control techniques, such as model-predictive control for modern diesel engine, it is important to establish a control-oriented model that can describe the gas mass flow dynamics including the dynamics of the pressure of intake and exhaust manifold and the turbocharger. Through the analysis of the structure of air path system, a simplied model with three states is obtained. Using the real-time data from diesel engine test bench, we estimate several submodels parameters by adopting the least square optimization. Calculating the relative error between estimated parameters and corresponding measured one verify the accuracy of the model.

关键词： Diesel engine control-oriented model Identification Air path system

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control-oriented model of a membrane humidifier for fuel cell applications

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ENERGY CONVERSION AND MANAGEMENT 2017年 137卷 121-129页

作者： Solsona, Miguel Kunusch, Cristian Ocampo-Martinez, Carlos Univ Twente MESA Inst Nanotechnol BIOS Lab Chip Grp POB 217 NL-7500 AE Enschede Netherlands Univ Twente MIRA Inst Biomed Technol & Tech Med POB 217 NL-7500 AE Enschede Netherlands Brose Fahrzeugteile GmbH Ohmstrabe 2a D-97076 Wurzburg Germany Univ Politecn Cataluna Inst Robat Informet Ind CSIC UPC Llorens Artigas4-6 E-08028 Barcelona Spain

Improving the humidification of polymer electrolyte membrane fuel-cells (PEMFC) is essential to optimize its performance and stability. Therefore, this paper presents an experimentally validated model of a low temperature PEMFC cathode humidifier for control/observation design purposes. A multi-input/multi-output non-linear fourth order model is derived, based on the mass and heat dynamics of circulating air. In order to validate the proposed model and methodology, experimental results are provided. Finally, a non-linear control strategy based on second order sliding mode is designed and analyzed in order to show suitability and usefulness of the approach. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： PEM fuel-cell Gas humidifier modelling control-oriented model

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A combustion phasing control-oriented model applied to an RCCI engine 5

A combustion phasing control-oriented model applied to an RC...

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5th International-Federation-of-Automatic-control (IFAC) Conference on Engine and Powertrain control, Simulation and modeling (E-COSM)

作者： Guardiola, C. Pla, B. Bares, P. Barbier, A. Univ Politecn Valencia CMT Motores Term Camino Vera S-N E-46022 Valencia Spain

Low temperature combustions such as Reactivity controlled Compression Ignition (RCCI) have been shown to be a promising way to reduce pollutants at the exhaust, i.e. NOx and soot emissions, and increase the thermal efficiency of future engines. However, such concepts are subject to substantial control sensitivity, e.g. combustion phasing, due to their lack of direct actuation for controlling the ignition of the mixture. This work investigates a control-oriented model based on physical equations aimed to predict the start of combustion and the crank angle of 50% fuel burnt (CA50). The model was developed for predicting the ignition using a modified knock integral model and a linear equation was used to estimate the burn duration between the start of combustion and the combustion phasing. The calibration and the validation of the model were performed using experimental data from a heavy-duty engine showing good results under transient operation. (C) 2018, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Reactivity controlled compression ignition control-oriented model modified knock integral model

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A control-oriented model for Trajectory-Based HCCI Combustion control

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JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND control-TRANSACTIONS OF THE ASME 2018年第9期140卷 091013-091013页

作者： Zhang, Chen Sun, Zongxuan Univ Minnesota Dept Mech Engn Twin Cites Campus111 Church St SEME 452 Minneapolis MN 55455 USA

Previously, the authors have proposed the concept of piston trajectory-based homogeneous charge compression ignition (HCCI) combustion control enabled by a free piston engine (FPE) and shown its benefits on both engine thermal efficiency and emissions by implementing various piston trajectories. In order to realize the HCCI trajectory-based combustion control in practical applications, a control-oriented model with sufficient chemical kinetics information has to be developed. In this paper, such a model is proposed and its performance, in terms of computational speed and model fidelity, is compared to three existing models: a simplified model using a one-step global reaction, a reduced-order model using Jones-Lindstedt mechanism, and a complex physics-based model including detailed chemical reaction mechanisms. A unique phase separation method is proposed to significantly reduce the computational time and guarantee the prediction accuracy simultaneously. In addition, the paper also shows that the high fidelity of the proposed model is sustained at multiple working conditions, including different air-fuel ratios (AFR), various compression ratios (CR), and distinct piston motion patterns between the two end positions. Finally, an example is presented showing how the control-oriented model enables real-time optimization of the HCCI combustion phasing by varying the trajectories. The simulation results show that the combustion phasing can be adjusted quickly as desired, which further demonstrates the effectiveness of the piston trajectory-based combustion control.

关键词： control-oriented model free piston engine trajectory-based combustion control phase separation method

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A control-oriented combustion model for a turbulent jet ignition engine using liquid fuel

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INTERNATIONAL JOURNAL OF ENGINE RESEARCH 2018年第8期19卷 813-826页

作者： Song, Ruitao Vedula, Ravi Teja Zhu, Guoming Schock, Harold Michigan State Univ E Lansing MI 48824 USA Michigan State Univ Energy & Automot Res Lab 1497 Engn Res CourtRoom E148 E Lansing MI 48824 USA

A control-oriented engine model is necessary for developing and validating the associated engine control strategies. For engines equipped with the turbulent jet ignition system, the interaction between the pre- and main-combustion chambers should be considered in the control-oriented model for model-based control strategies that optimize the overall thermal efficiency in real-time. Therefore, a two-zone combustion model based on the newly proposed parameter-varying Wiebe function is proposed. Since the engine uses the liquid fuel, a pre-chamber air-fuel mixing and vaporization model are also developed. The model was validated using the experimental data from a single-cylinder turbulent jet ignition engine under different operational conditions, and the simulation results show a good agreement with the experimental data. The relative simulation error of the in-cylinder pressure is less than 8%. For most of the other pressure-related variables, such as indicated mean effective pressure and main-chamber burn duration, the relative errors are within 5%.

关键词： control-oriented model fuel vaporization model liquid fuel two-zone combustion model turbulent jet ignition

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control-oriented dynamic model of an inductively coupled plasma torch by artificial intelligence methodology

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PLASMA PHYSICS AND controlLED FUSION 2019年第4期61卷 044002-044002页

作者： Kim, Keun Su Natl Res Council Canada Emerging Technol Div Secur & Disrupt Technol Res Ctr Ottawa ON K1A 0R6 Canada Univ Toronto Dept Mech & Ind Engn 5 Kings Coll Rd Toronto ON M5S 3G8 Canada

Inductively coupled plasma (ICP) torches have been widely used in various materials processing. To improve the control of their processes, there has been a growing demand for simplified numerical models which can rapidly predict the dynamics of plasma jets subject to time-varying inputs or external disturbances. In this paper, control-oriented dynamic models of an ICP torch are developed as an alternative to the complex, high-level 2D time-dependent numerical model (i.e. a model based on magneto-hydrodynamic equations). Prior to model development, the detailed dynamic and nonlinear nature of the ICP torch to its time-varying operation conditions was numerically investigated using a 2D numerical model to gain insight into choosing appropriate dynamic model structures. Linear ARX (AutoRegressive with eXogenous input) and ARX-type neural network models were selected in the model identification, and their parameters or weightings were determined using the input/output data obtained from the 2D time-dependent numerical model. The dynamic behaviours of the ICP torch predicted from the developed models were in good agreement with the data from the 2D time-dependent numerical model. Using the developed models, a simple control system for the plasma temperature and axial velocity regulations was also designed and tested. The feedback control simulations demonstrated good set point tracking and disturbance rejection performances, indicating that the developed approach can be directly applied to the model-based control system design of an ICP torch as well as other thermal plasma torches.

关键词： inductively coupled plasma torch magneto-hydrodynamics control-oriented model neural networks model predictvie control nanomaterials synthesis

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A new control-oriented transient model of variable geometry turbocharger

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ENERGY 2017年 125卷 297-312页

作者： Bahiuddin, Irfan Mazlan, Saiful Amri Imaduddin, Fitrian Ubaidillah Univ Teknol Malaysia Malaysia Japan Int Inst Technol Jalan Sultan Yahya Petra Kuala Lumpur 54100 Wilayah Perseku Malaysia Univ Sebelas Maret Fac Engn Mech Engn Dept Jl Jr Sutami 36 A Kentingan 57126 Surakarta Indonesia Multimedia Univ Fac Engn & Technol Jalan Ayer Keroh Lama Bukit Beruang 75450 Melaka Malaysia

The flow input of a variable geometry turbocharger turbine is highly unsteady due to rapid and periodic pressure dynamics in engine combustion chambers. Several VGT control methods have been developed to recover more energy from the highly pulsating exhaust gas flow. To develop a control system for the highly pulsating flow condition, an accurate and valid unsteady model is required. This study focuses on the derivation of governing the unsteady control-oriented model (COM) for a turbine of an actively controlled turbocharger (ACT). The COM has the capability to predict the turbocharger behaviour regarding the instantaneous turbine actual and isentropic powers in different effective throat areas. The COM is a modified version of a conventional mean value model (MVM) with an additional feature to calculate the turbine angular velocity and torque for determining the actual power. The simulation results were further compared with experimental data in two general scenarios. The first scenario was simulations on fixed geometry positions. The second simulation scenario considered the nozzle movement after receiving a signal from the controller in different cases. The comparison between simulation and experimental results showed similarities in the recovered power behaviours the turbine inlet area increases or vice versa. The model also has proved its reliability to replicate general behaviour as in the example of ACT cases presented in this paper. However, the model is incapable to replicate the detailed and complicated phenomena, such as choking effect and hysteresis effect. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： Variable geometry turbocharger Turbine control-oriented model Engine exhaust gas Pulsated flow Extracted power

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control-oriented modeling of Single-Phase Transformers

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IEEE TRANSACTIONS ON MAGNETICS 2025年第5期61卷

作者： Schwartze, Nicolai Moschik, Sonja Reichhartinger, Markus Graz Univ Technol Inst Automat & Control A-8010 Graz Austria OMICRON Elect GmbH A-6833 Klaus Austria

A control-oriented mathematical model for single-phase transformers, including the effects of saturation, hysteresis, and classical eddy current losses, is proposed. The model equations are derived by combining the mechanical and electrical properties of the ferromagnetic transformers' core. This approach offers the flexibility for model enhancement by providing a procedure for incorporating additional domain-specific effects. It is shown that the model satisfies well-established properties of systems with hysteresis. The model is mathematically analyzed and experimentally validated on different transformers, confirming the applicability for a wide range of devices. Furthermore, it is demonstrated that the model structure is independent of any specific choice of the input signal form by reproducing experimental results for both sinusoidal and rectangular excitation voltages. The proposed model is compared with a single-phase transformer model based on the well-recognized Jiles-Atherton hysteresis model, which generally highlights the competitiveness in terms of accuracy and required computational effort for simulation studies. Therefore, the model is well suited for model-based controller design tasks and real-time applications.

关键词： Mathematical models Magnetic hysteresis Computational modeling Circuit faults Springs Numerical models Magnetic domains Phase transformers Magnetic flux Torque control-oriented model hysteresis properties loss separation model identification single-phase transformer

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