Semi-physical NOx and soot model for CI engines: Study of its calibration procedure and portability

Karaky, Hassan; Marty, Pierre; Tauzia, Xavier; Maiboom, Alain; Mauviot, Gilles

doi:10.1177/0954407020931686

Cited by 2 publications

(1 citation statement)

References 43 publications

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“…This ultimately takes the foreseen application of this model reduction concept far beyond typical digital twin engine applications based on black-box or mean value engine models, as stated in the introduction, mainly limited to on-board monitoring. The detailed CA-based resolving of combustion, demonstrated here, enables coupling with semi-predictive emission models 30,31 to be captured with the same real-time FRM implementation. According to the offline test in Figure 13, there would be a sufficient real-time surplus available for this purpose.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Toward a digital twin of a mid-speed marine engine: From detailed 1D engine model to real-time implementation on a target platform

Hautala

Mikulski

Söderäng

et al. 2022

International Journal of Engine Research

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System complexity is challenging for development of marine mid-speed engines when striving to meet increasingly stringent emission targets. Control-oriented modeling offers a solution, cutting calibration time and enabling robust control strategies. Simultaneously, real-time, physics-based engine models (digital twins) are emerging as they offer better predictive capability and scalability than typical mean-value, data-driven approaches. This study explored development of a control-oriented digital twin of a Wärtsilä 4L20 marine engine. Starting from a detailed one-dimensional model (GT-Suite), it explored reduction strategies toward a fast-running engine model (FRM), balancing the calculation speed and accuracy trade-off. Finally, the FRM was tested for real-time implementation on a target machine. Comprehensive experimental data from the 4L20 platform in the VEBIC Engine Laboratory provided the baseline for model calibration. Model calibration and validation covered four representative operating points and involved correlation of crank-angle, resolved in-cylinder pressures, thermal state at several locations of the engine air-path and relevant performance indicators. The results shed new light on the feasibility of digital twins in the marine engine domain. The obtained FRM was three times faster than real-time, while the accuracy loss was comfortably within the 5% tolerance levels for the governing outputs, including crank angle resolved in-cylinder pressure. The grid-resolved simulation was obtained with four times fewer flow components and internal discretization length of 100% and 150% of the cylinder bore for intake and exhaust components respectively. The balance between predictivity, accuracy and real-time surplus, was ultimately more favorable than in state of the art automotive applications and enables exploring further coupling with semi-predictive emission sub-models. The real-time capable FRM is considered applicable in hardware-in-the-loop simulation, and this application is scheduled in a follow-up project.

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Section: Discussion and Outlookmentioning

confidence: 99%

Toward a digital twin of a mid-speed marine engine: From detailed 1D engine model to real-time implementation on a target platform

Hautala

Mikulski

Söderäng

et al. 2022

International Journal of Engine Research

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Fluid-solid coupling simulation study on fuel leakage and deformation characteristics of precision coupling component in common rail injector and influence of pressure equalizing structure

Zhou

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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In the foreseeable future, the use of fossil energy is still irreplaceable, makes efficient use of fossil energy and reduce emissions became important topics. Diesel engines have a very high share in the transportation field, and high-pressure common rail system has highly improved the performance of diesel engines. As the most important component of common rail system, the performance of common rail injector directly affects the engine. Precision coupling components are composed of moving parts with very precise clearance fit in the injector. With the wear of parts, fuel leakage of precision coupling components may reach the same level as injection quantity, which will seriously affect the injection pressure actually established, and then affect the power, efficiency, and emission performance of diesel engine. Many researchers have studied fuel leakage of precision coupling components, and put forward different methods to reduce fuel leakage, including improving the machining accuracy and machining annular grooves on parts. However, the wear of parts makes it a high-cost and low-effective method to improve machining accuracy. Besides, researchers have not fully considered the deformation of parts. In this work, fluid-solid coupling simulations were performed to analyze deformation and static fuel leakage characteristics, and to investigate effects of pressure equalizing structure on deformation and leakage of precision coupling component in common-rail injector. Different from the previous researches, the influence of machining the annular groove on the plunger sleeve instead of on the plunger, and influence of coexistence of annular groove and deformation were considered. The results show the deformation characteristics of the parts, the fuel flow characteristics in the gap, and the influence of the annular groove on the fuel leakage. The connection between the deformation of parts and fuel leakage, and potential methods to reduce the leakage are also discussed.

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Semi-physical NOx and soot model for CI engines: Study of its calibration procedure and portability

Cited by 2 publications

References 43 publications

Toward a digital twin of a mid-speed marine engine: From detailed 1D engine model to real-time implementation on a target platform

Toward a digital twin of a mid-speed marine engine: From detailed 1D engine model to real-time implementation on a target platform

Fluid-solid coupling simulation study on fuel leakage and deformation characteristics of precision coupling component in common rail injector and influence of pressure equalizing structure

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