Analysis of processing methods for combustion pressure measurement in a diesel engine

Márcio José da Silva, Alex de Oliveira, José Ricardo Sodré*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

This paper analyzes combustion chamber pressure data processing methods related to the number of cycles averaged, top dead center referencing and pressure referencing (pegging). A total of 1000 consecutive engine cycles were measured in a four-cylinder diesel engine. The number of cycles that minimizes the influence of cycle-to-cycle oscillations depends on engine operating conditions and the parameters under analysis. The top dead center (TDC) referencing, using the motored curve, revealed that the thermodynamic loss shifts the peak pressure − 0.4 °CA from TDC. Four pegging methods were compared—least-squares, fixed-point, three-point and two-point—introducing as main novelty the fact they have not been previously investigated on the same baseline conditions. The least-squares based method showed the lowest sensitivity to random noise, but with longer processing time, and the fixed-point method presented higher dispersion in the heat release analysis. The three-point referencing method considers a variable polytropic coefficient, but suffers from noise sensitivity, and the two-point referencing method presented close values and higher dispersion in comparison with the least-squares method. The choice of which method to use depends on the type of analysis, signal quality and processing time available.
Original languageEnglish
Article number282
JournalJournal of the Brazilian Society of Mechanical Sciences and Engineering
Volume41
Issue number7
Early online date8 Jun 2019
DOIs
Publication statusPublished - 1 Jul 2019

Fingerprint

Pressure measurement
Diesel engines
Processing
Engines
Signal analysis
Engine cylinders
Combustion chambers
Thermodynamics

Bibliographical note

© The Author(s) 2019. Open Access - This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Funding: CAPES, CNPq 304114/2013-8 Research Project and FAPEMIG TEC PPM 0385-15 Research Project.

Keywords

  • Combustion pressure
  • Cycle-to-cycle variation
  • Diesel engine
  • Pegging methods
  • Processing methods

Cite this

da Silva, M. J., de Oliveira, A., & Sodré, J. R. (2019). Analysis of processing methods for combustion pressure measurement in a diesel engine. Journal of the Brazilian Society of Mechanical Sciences and Engineering, 41(7), [282]. https://doi.org/10.1007/s40430-019-1785-9
da Silva, Márcio José ; de Oliveira, Alex ; Sodré, José Ricardo. / Analysis of processing methods for combustion pressure measurement in a diesel engine. In: Journal of the Brazilian Society of Mechanical Sciences and Engineering. 2019 ; Vol. 41, No. 7.
@article{09611c1fd8dd46b2a49f25c19a644dcf,
title = "Analysis of processing methods for combustion pressure measurement in a diesel engine",
abstract = "This paper analyzes combustion chamber pressure data processing methods related to the number of cycles averaged, top dead center referencing and pressure referencing (pegging). A total of 1000 consecutive engine cycles were measured in a four-cylinder diesel engine. The number of cycles that minimizes the influence of cycle-to-cycle oscillations depends on engine operating conditions and the parameters under analysis. The top dead center (TDC) referencing, using the motored curve, revealed that the thermodynamic loss shifts the peak pressure − 0.4 °CA from TDC. Four pegging methods were compared—least-squares, fixed-point, three-point and two-point—introducing as main novelty the fact they have not been previously investigated on the same baseline conditions. The least-squares based method showed the lowest sensitivity to random noise, but with longer processing time, and the fixed-point method presented higher dispersion in the heat release analysis. The three-point referencing method considers a variable polytropic coefficient, but suffers from noise sensitivity, and the two-point referencing method presented close values and higher dispersion in comparison with the least-squares method. The choice of which method to use depends on the type of analysis, signal quality and processing time available.",
keywords = "Combustion pressure, Cycle-to-cycle variation, Diesel engine, Pegging methods, Processing methods",
author = "{da Silva}, {M{\'a}rcio Jos{\'e}} and {de Oliveira}, Alex and Sodr{\'e}, {Jos{\'e} Ricardo}",
note = "{\circledC} The Author(s) 2019. Open Access - This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funding: CAPES, CNPq 304114/2013-8 Research Project and FAPEMIG TEC PPM 0385-15 Research Project.",
year = "2019",
month = "7",
day = "1",
doi = "10.1007/s40430-019-1785-9",
language = "English",
volume = "41",
number = "7",

}

da Silva, MJ, de Oliveira, A & Sodré, JR 2019, 'Analysis of processing methods for combustion pressure measurement in a diesel engine', Journal of the Brazilian Society of Mechanical Sciences and Engineering, vol. 41, no. 7, 282. https://doi.org/10.1007/s40430-019-1785-9

Analysis of processing methods for combustion pressure measurement in a diesel engine. / da Silva, Márcio José; de Oliveira, Alex; Sodré, José Ricardo.

In: Journal of the Brazilian Society of Mechanical Sciences and Engineering, Vol. 41, No. 7, 282, 01.07.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Analysis of processing methods for combustion pressure measurement in a diesel engine

AU - da Silva, Márcio José

AU - de Oliveira, Alex

AU - Sodré, José Ricardo

N1 - © The Author(s) 2019. Open Access - This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funding: CAPES, CNPq 304114/2013-8 Research Project and FAPEMIG TEC PPM 0385-15 Research Project.

PY - 2019/7/1

Y1 - 2019/7/1

N2 - This paper analyzes combustion chamber pressure data processing methods related to the number of cycles averaged, top dead center referencing and pressure referencing (pegging). A total of 1000 consecutive engine cycles were measured in a four-cylinder diesel engine. The number of cycles that minimizes the influence of cycle-to-cycle oscillations depends on engine operating conditions and the parameters under analysis. The top dead center (TDC) referencing, using the motored curve, revealed that the thermodynamic loss shifts the peak pressure − 0.4 °CA from TDC. Four pegging methods were compared—least-squares, fixed-point, three-point and two-point—introducing as main novelty the fact they have not been previously investigated on the same baseline conditions. The least-squares based method showed the lowest sensitivity to random noise, but with longer processing time, and the fixed-point method presented higher dispersion in the heat release analysis. The three-point referencing method considers a variable polytropic coefficient, but suffers from noise sensitivity, and the two-point referencing method presented close values and higher dispersion in comparison with the least-squares method. The choice of which method to use depends on the type of analysis, signal quality and processing time available.

AB - This paper analyzes combustion chamber pressure data processing methods related to the number of cycles averaged, top dead center referencing and pressure referencing (pegging). A total of 1000 consecutive engine cycles were measured in a four-cylinder diesel engine. The number of cycles that minimizes the influence of cycle-to-cycle oscillations depends on engine operating conditions and the parameters under analysis. The top dead center (TDC) referencing, using the motored curve, revealed that the thermodynamic loss shifts the peak pressure − 0.4 °CA from TDC. Four pegging methods were compared—least-squares, fixed-point, three-point and two-point—introducing as main novelty the fact they have not been previously investigated on the same baseline conditions. The least-squares based method showed the lowest sensitivity to random noise, but with longer processing time, and the fixed-point method presented higher dispersion in the heat release analysis. The three-point referencing method considers a variable polytropic coefficient, but suffers from noise sensitivity, and the two-point referencing method presented close values and higher dispersion in comparison with the least-squares method. The choice of which method to use depends on the type of analysis, signal quality and processing time available.

KW - Combustion pressure

KW - Cycle-to-cycle variation

KW - Diesel engine

KW - Pegging methods

KW - Processing methods

UR - http://link.springer.com/10.1007/s40430-019-1785-9

UR - http://www.scopus.com/inward/record.url?scp=85066932031&partnerID=8YFLogxK

U2 - 10.1007/s40430-019-1785-9

DO - 10.1007/s40430-019-1785-9

M3 - Article

VL - 41

IS - 7

M1 - 282

ER -

da Silva MJ, de Oliveira A, Sodré JR. Analysis of processing methods for combustion pressure measurement in a diesel engine. Journal of the Brazilian Society of Mechanical Sciences and Engineering. 2019 Jul 1;41(7). 282. https://doi.org/10.1007/s40430-019-1785-9