Extracting physical parameters from system identification of a natural gas engine

Gangopadhyay, Anupam; Meckl, Peter H.

doi:10.1109/87.918896

Cited by 16 publications

(2 citation statements)

References 3 publications

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“…Brake thermal efficiency, η thermal represents the overall efficiency of the engine, or the ratio of the amount of usable power extracted from the combustion process to the available fuel power and is an important parameter to estimate the torque produced by the engine. In Gangopadhyay 22 , η thermal is identified to be a function of the normalized AFR, λ and the spark ignition timing, θ . For this engine, it was observed that the effect of spark timing on brake thermal efficiency was not dominant and therefore, in this paper, an analytical model which is dependent only on AFR, as shown in equation (16) is chosen.…”

Section: Control-oriented Engine Modelingmentioning

confidence: 99%

Control-oriented modeling, validation, and interaction analysis of turbocharged lean-burn natural gas variable speed engine

Rayasam

Qiu

Rimstidt

et al. 2021

International Journal of Engine Research

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Accurate modeling and control of the gas exchange process in a modern turbocharged spark-ignited engine is critical for the control and analysis of different control strategies. This paper develops a simple physics-based, five-state engine model for a large four-stroke spark-ignited turbocharged engine fueled by natural gas that is used in variable speed applications. The control-oriented model is amenable for control algorithm development and includes the impacts of modulation to any combination of four actuators: throttle valve, bypass valve, fuel rate, and wastegate valve. The control problem requires tracking engine speed to provide propulsive power, differential pressure across the throttle valve to prevent compressor surge, air-to-fuel ratio to restrict engine emissions. Two validation strategies, open-loop and closed-loop, are used to validate the accuracy of both nonlinear and linear versions of the control-oriented model. The control models are able to capture the engine dynamics within 5%–10% error at most of the engine operating points. Finally, the relative gain array (RGA) is applied to the linearized engine model to understand the degree of interactions between plant inputs and outputs as a function of frequency for various operating points. Results of the RGA analysis show that the preferred input-output pairing changes depending on the linear plant model as well as frequency. Therefore, a coordinated controller is ideal to tackle the control problem in question.

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Section: Control-oriented Engine Modelingmentioning

confidence: 99%

Control-oriented modeling, validation, and interaction analysis of turbocharged lean-burn natural gas variable speed engine

Rayasam

Qiu

Rimstidt

et al. 2021

International Journal of Engine Research

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“…Pour ce faire, il procède à la phase usuellement dénommée identication qui s'appuie sur des lois statistiques †Actuellement à l'École Supérieure d'Ingénieurs en Élec-tronique et Électrotechnique, Antenne de Sophia-Antipolis, rue Albert Einstein, BP 085, 06902 Sophia-Antipolis, Email : igierc@esiee.fr pour aboutir à un modèle qualié de boîte noire ou de représentation [2,3]. Cependant, dans un grand nombre de domaines applicatifs comme la robotique ( [4,5,6]), la mécanique ( [7,8]), l'électrotech-nique ( [9,10,11,12,13]) et l'automobile ( [14,15,16]), il ne sut pas de disposer d'un modèle falsiant de façon satisfaisante les données expérimentales, il faut en plus que celui-ci ait des paramètres qui puissent avoir un sens pour le spécialiste du domaine d'application. Pour obtenir de tels modèles dits deconnaissance ou boîte blanche, les lois de la physique sont classiquement exploitées.…”

Section: Introductionunclassified

Mise en oeuvre d'une technique de régularisation pour l'estimation de paramètres physiques : application à un banc d'essai électro-mécanique

Sibille¹,

Defranoux-Igier²

2005

J3eA

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Résumé : Cette manipulation a pour objectif de mettre en ÷uvre une technique de régularisation par critère composite pour estimer directement les paramètres physiques d'un modèle à temps continu représentant un banc électro-mécanique simple et classique. Sur cette application, nous illustrons la notion d'identiabilité locale et les problèmes classiques liés aux méthodes locales d'optimisation (choix des paramètres initiaux, conditionnement du hessien du critère, estimation d'incertitudes paramétriques,. . . ). Il est également montré comment l'introduction de connaissances paramétriques peut pallier le problème d'identiabilité du modèle et mener ainsi à la seule solution physiquement acceptable. Une exploitation originale des expressions analytiques des critères régularisé et non régularisé en comparaison avec les estimations obtenues permet une validation de la structure du modèle simplié.

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Speed control of general‐purpose engine with electronic governor

Sawut

Tohti

Takigawa

et al. 2012

Electrical Engineering Japan

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SUMMARYThis paper presents a general-purpose engine speed control system with an electronic governor in order to improve the current system with a mechanical governor, which shows unstable characteristics as a result of a change in mechanical friction or the A/F ratio (air-fuel ratio). The control system above has the problems that the feedback signal is only the crank angle because of cost, and the controlled object is a general-purpose engine, which is strongly nonlinear. In order to overcome these problems, a system model is presented for dynamic estimation of the amount of air flow, and a robust controller is designed. In concrete terms, the proposed system includes a robust sliding-mode controller using the feedback signal of only the crank angle, with a genetic algorithm applied to the controller design. Simulations and experiments performed using Matlab/Simulink show the effectiveness of our proposal.

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Extracting physical parameters from system identification of a natural gas engine

Cited by 16 publications

References 3 publications

Control-oriented modeling, validation, and interaction analysis of turbocharged lean-burn natural gas variable speed engine

Control-oriented modeling, validation, and interaction analysis of turbocharged lean-burn natural gas variable speed engine

Mise en oeuvre d'une technique de régularisation pour l'estimation de paramètres physiques : application à un banc d'essai électro-mécanique

Speed control of general‐purpose engine with electronic governor

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