Combustion Chamber Wall Temperature Measurement and Modeling During Transient HCCI Operation

Wilhelmsson, Carl; Vressner, Andreas; Tunestål, Per; Johansson, Bengt; Särner, Gustaf; Aldén, Marcus

doi:10.4271/2005-01-3731

Cited by 26 publications

(16 citation statements)

References 17 publications

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“…• CA, or 1-4 ms during normal engine operation, the assumption of constant heat losses is valid even for transients, such as fuel cut-off or engine switch-off, since wall heat dynamics are very slow as shown in [13]. Furthermore the biggest temperature swing over the estimation interval is about 250 K which corresponds to a variation in specific heat ratio by merely two percent.…”

Section: Discussionmentioning

confidence: 99%

TDC Offset Estimation from Motored Cylinder Pressure Data based on Heat Release Shaping

Tunestål

2011

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Résumé -Estimation du décalage de PMH à partir de données de pression de cylindre moteur basées sur la conformation de libération de chaleur -La détermination du décalage de Point Mort Haut (PMH) correct d'un moteur à combustion interne est plus difficile qu'il n'y paraît. Cette étude introduit une nouvelle méthode destinée à déterminer le décalage de PMH sur la base de la simple supposition que la puissance de perte de chaleur à travers les parois de la chambre de combustion soit constante pour des cycles moteur selon un intervalle d'angle de bras de manivelle étroit autour du PMH. La méthode proposée utilise une optimisation des moindres carrés non linéaire pour déterminer la combinaison de rapport de chaleur spécifique et de décalage de PMH qui rend la puissance de perte de chaleur aussi constante que possible. Un sous-problème important consiste à déterminer la localisation de pression de pic avec une haute précision. L'application d'une série de Fourier du troisième ordre à la pression de cylindre moteur permet l'estimation du maximum de pression moyennant un écart-type de 0,005• d'angle de bras de manivelle (AM) et elle peut être également utilisée à la place de la pression mesurée afin de réduire l'incertitude de l'estimation du PMH d'environ 50 %. L'écart-type d'une estimation de PMH de cycle unique est approximativement de 0,025• d'AM lors de l'utilisation d'une résolution de bras de manivelle de 0,2• d'AM pour les mesures. L'erreur systématique de l'estimation de PMH se situe dans la plage allant de 0 à 0,02• d'AM par comparaison à la fois avec les mesures réalisées au moyen d'un détecteur de PMH et avec des cycles moteur simulés. La méthode peut être utilisée à la fois à des fins d'étalonnage et de diagnostics à bord, par exemple pendant un démarrage, une coupure de carburant ou un arrêt du moteur. La série de Fourier du troisième ordre appliquée s'accompagne d'une pénalisation de calcul significative mais, puisqu'elle n'est appliquée que de façon très intermittente, ceci ne doit pas poser un problème sérieux. Abstract -TDC Offset Estimation from Motored Cylinder Pressure Data based on Heat Release Shaping -Finding the correct Top Dead Center (TDC) offset for an internal combustion engine is harder than it seems. This study introduces a novel method to find the TDC offset based on the simple assumption that the heat loss power through the combustion chamber walls is constant for motored cycles in a narrow

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Section: Discussionmentioning

confidence: 99%

TDC Offset Estimation from Motored Cylinder Pressure Data based on Heat Release Shaping

Tunestål

2011

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…The parameters H w , H p , and H u define the length and offset of the prediction horizon and the length of the control horizon. At each sample, the cost function in (18) 47th IEEE CDC, Cancun, Mexico, Dec. [9][10][11]2008 ThC16.2 is minimized by determining a sequence of changes to the control signal ∆u(k + i|k), i = 0 . .…”

Section: A Model Predictive Controlmentioning

confidence: 99%

“…The integrand was approximated with its maximum value, which is attained at Top Dead Center (TDC). The corresponding crank angle degree (CAD) was denoted θ T DC , 47th IEEE CDC, Cancun, Mexico, Dec. [9][10][11]2008 ThC16.2 so that f k (θ) = f k (θ T DC ). The lower integration limit was then shifted from θ IV C to θ T DC and the resulting integral equation was solved for θ ign (k);…”

Section: B Temperature Tracementioning

confidence: 99%

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Physical Modeling and Control of Homogeneous Charge Compression Ignition (HCCI) engines

Widd

Tunestål

Johansson

2008

2008 47th IEEE Conference on Decision and Control

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Due to the possibility of increased efficiency and reduced emissions, Homogeneous Charge Compression Ignition (HCCI) is a promising alternative to conventional internal combustion engines. Ignition timing in HCCI is highly sensitive to operating conditions and lacks direct actuation, making it a challenging subject for closed-loop control. This paper presents results on model-based control of ignition timing and work output using a cycle-resolved physical model including cylinder wall temperature dynamics. The model was used to design model predictive controllers for simultaneous control of the ignition timing and the indicated mean effective pressure by varying the inlet valve closing and the intake temperature. The performance of the resulting controller was evaluated in simulation and two possible extensions were developed. An extended controller was validated on a real engine.

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“…In this study, the temporally resolved temperature measurements inside internal combustion engines were reported in [11][12][13][14][15][16][17][18].…”

mentioning

confidence: 99%

A First Application of Thermographic Phosphors in a Marine Two-Stroke Diesel Engine for Surface Temperature Measurement

Nada

Hult²,

Knappe

et al. 2014

Volume 1: Large Bore Engines; Fuels; Advanced Combustion; Emissions Control Systems

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Phosphor thermometry is applied for the first time in a large-bore two-stroke diesel engine. The work proves the practicality of phosphor thermometry in large-bore engines. The experiments were conducted on the MAN 4T50ME-X marine research engine equipped with an optical cylinder head. By employing a thin surface coating of CdWO 4 phosphor, cycle resolved temperature measurements of the cylinder wall were obtained. Motored and fired engine operations were tested at engine loads covering the low and medium engine load range. Phosphor thermometry proved to be successful in retrieving the temperature with standard deviations ranging around 1-8 K. Experimental considerations like detector linearity, coating thickness and an automated phosphor calibration routine will be addressed.

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Combustion Chamber Wall Temperature Measurement and Modeling During Transient HCCI Operation

Cited by 26 publications

References 17 publications

TDC Offset Estimation from Motored Cylinder Pressure Data based on Heat Release Shaping

TDC Offset Estimation from Motored Cylinder Pressure Data based on Heat Release Shaping

Physical Modeling and Control of Homogeneous Charge Compression Ignition (HCCI) engines

A First Application of Thermographic Phosphors in a Marine Two-Stroke Diesel Engine for Surface Temperature Measurement

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