The increasing attention in reducing pollutant emissions and fuel consumption in internal combustion engines is promoting the development of more sophisticated control systems for the diagnosis and the optimization of the combustion process. In this view, the real-time monitoring of the in-cylinder pressure is becoming mandatory in order to ensure the desired levels of performance and efficiency. At the current state of technology, however, the cost and the intrusiveness of pressure sensors, coupled with the harsh operating conditions that limit their lifetime, make the direct measurement of in-cylinder pressure not suitable for mass production applications yet. Therefore, cost-effective and reliable alternative solutions to extract the pressure trace are of major interest. In this study, a methodology for this scope has been developed and validated with experiments. The methodology consists in a two-step procedure; first, the mechanical stress signal coming from a piezoelectric strain washer, installed under one of the engine studs, is considered. Then, this information is coupled with a 0D thermodynamic model, able to estimate the in-cylinder pressure for the entire cycle without combustion. In this way it is possible to compare in real-time the estimated in-cylinder pressure and the mechanical stress measured on the engine stud and to define a direct mathematical correlation between the two. The developed model has proven to properly estimate the correlation between stud stress and in-cylinder pressure, providing a more accurate estimation of the in-cylinder pressure, pressure peak position and maximum value, together with the parameters related to the combustion process.
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17 December 2019
74TH ATI NATIONAL CONGRESS: Energy Conversion: Research, Innovation and Development for Industry and Territories
11–13 September 2019
Modena, Italy
Research Article|
December 17 2019
A methodology for the estimation of in-cylinder pressure in a four-stroke internal combustion engine based on the combination of a strain washer signal with a 0D thermodynamic model
Niccolò Fiorini;
Niccolò Fiorini
a)
1
Department of Industrial Engineering (DIEF), Università degli Studi di Firenze Via di Santa Marta 3
, 50139 Firenze (Italy
)a)Corresponding author [email protected]
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Luca Romani;
Luca Romani
b)
1
Department of Industrial Engineering (DIEF), Università degli Studi di Firenze Via di Santa Marta 3
, 50139 Firenze (Italy
)
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Giovanni Ferrara;
Giovanni Ferrara
c)
1
Department of Industrial Engineering (DIEF), Università degli Studi di Firenze Via di Santa Marta 3
, 50139 Firenze (Italy
)
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Giovanni Vichi;
Giovanni Vichi
2
Yanmar R&D Europe
, Viale Galileo 3/A, 50125 Firenze, Italy
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Alessandro Bellissima;
Alessandro Bellissima
2
Yanmar R&D Europe
, Viale Galileo 3/A, 50125 Firenze, Italy
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Go Asai;
Go Asai
3
Yanmar Co. Ltd., 1-32
, Chayamachi, Kita-ku, Osaka-sh, Osaka 8308311, Japan
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Ryota Minamino
Ryota Minamino
3
Yanmar Co. Ltd., 1-32
, Chayamachi, Kita-ku, Osaka-sh, Osaka 8308311, Japan
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AIP Conf. Proc. 2191, 020073 (2019)
Citation
Niccolò Fiorini, Luca Romani, Giovanni Ferrara, Giovanni Vichi, Alessandro Bellissima, Go Asai, Ryota Minamino; A methodology for the estimation of in-cylinder pressure in a four-stroke internal combustion engine based on the combination of a strain washer signal with a 0D thermodynamic model. AIP Conf. Proc. 17 December 2019; 2191 (1): 020073. https://doi.org/10.1063/1.5138806
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