Determination of cycle number for real in-cylinder pressure cycle analysis in internal combustion engines

Ceviz, Mehmet Akif; Çavuşoğlu, Bülent; Kaya, Ferhat; Öner, İlhan Volkan

doi:10.1016/j.energy.2011.01.038

Cited by 25 publications

(14 citation statements)

References 35 publications

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“…In this study, it is very important to assess the cyclic variation of the tested fuels because it affects the combustion stability of the engine [68]. The cause of the variation in the engine was directly affected by the chemical and physical process in the engine related to the mixture ratio of the particular fuels, cycle-to-cycle charging, spark timing, and incylinder motion [81]. The mean value of the measured IMEP for 500 consecutive cycles was calculated to gain insight into the average IMEP of the particular fuels as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation of combustion, emissions and thermal balance of secondary butyl alcohol-gasoline blends in a spark ignition engine

Yusri

Mamat

Azmi

et al. 2016

Energy Conversion and Management

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Section: Resultsmentioning

confidence: 99%

Experimental investigation of combustion, emissions and thermal balance of secondary butyl alcohol-gasoline blends in a spark ignition engine

Yusri

Mamat

Azmi

et al. 2016

Energy Conversion and Management

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“…In general, increased number of cycles that are used for averaging is favoured, however there is a point over which increasing the number of cycles does not lower standard deviation between cycles. Therefore, 100 consecutive cycles were used for averaging of the pressure trace, which is in between the proposed minimum 50 cycles [28] and few hundred cycles [11].…”

Section: Methodsmentioning

confidence: 99%

A New Method for Simultaneous Determination of the TDC Offset and the Pressure Offset in Fired Cylinders of an Internal Combustion Engine

et al. 2017

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An innovative computationally efficient method for the simultaneous determination of top dead centre (TDC) offset and pressure offset is presented. It is based on characteristic deviations of the rate of heat release (ROHR) that are specific for both offsets in compression phase and expansion phase after the end of combustion. These characteristic deviations of the ROHR are derived from first principles and they were also confirmed through manual shifts of the pressure trace. The ROHR is calculated based on the first law of thermodynamics using an in-cylinder pressure trace, engine geometrical parameters and operating point specific parameters. The method can be applied in off-line analyses using an averaged pressure trace or in on-line analyses using a single pressure trace. In both application areas the method simultaneously determines the TDC position and the pressure offset within a single processing of the pressure trace, whereas a second refinement step can be performed for obtaining more accurate results as correction factors are determined more accurately using nearly converged input data. Innovative analytic basis of the method allows for significant reduction of the computational times compared to the existing methods for the simultaneous determination of TDC offset and pressure offset in fired conditions. The method was validated on a heavy-duty and a light-duty diesel engine.

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“…The optimal number of cycles to be averaged depends on several factors such as engine type, engine operating condition and data acquisition system [1]. Cyclic variations are caused by chemical and physical phenomena, as they are related to mixture composition, cycle cylinder charging and in-cylinder mixture motion [4].…”

Section: Introductionmentioning

confidence: 99%

“…The minimum number of cycles for an accurate calculation of the average pressure varies from 25 to 2800 [4]. From tests in a spark ignition engine operating at different conditions, 50 cycles were reported to be sufficient to provide accurate averaged values [4].…”

Section: Introductionmentioning

confidence: 99%

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

Silva

Oliveira

Sodré

2019

J Braz. Soc. Mech. Sci. Eng.

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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.

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Determination of cycle number for real in-cylinder pressure cycle analysis in internal combustion engines

Cited by 25 publications

References 35 publications

Experimental investigation of combustion, emissions and thermal balance of secondary butyl alcohol-gasoline blends in a spark ignition engine

Experimental investigation of combustion, emissions and thermal balance of secondary butyl alcohol-gasoline blends in a spark ignition engine

A New Method for Simultaneous Determination of the TDC Offset and the Pressure Offset in Fired Cylinders of an Internal Combustion Engine

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

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