Effect of instantaneous rotational speed on the analysis of measured diesel engine cylinder pressure data

Antonopoulos, Antonis; Hountalas, D. T.

doi:10.1016/j.enconman.2012.01.020

Cited by 18 publications

(9 citation statements)

References 16 publications

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“…The time-based technique was used for the in-cylinder pressure phasing with crank angle, resulting in an angular resolution of 0.1 °CA with an acquisition rate of 100 kHz. As the engine had four cylinders and was operated at constant speed (1800 RPM), the crank angle phasing errors due to instantaneous crankshaft speed fluctuations were reduced [20]. The analog signal from the magnetic sensor was conditioned by a LM1815 adaptive variable reluctance amplifier to turn it into a digital signal and eliminate noise.…”

Section: Methodsmentioning

confidence: 99%

“…From each symmetrical point, a straight line was connected and the center position was derived from that line. Using linear regression, a straight line was calculated through the central points and the intersection of this line with the crank angle axis determined θ loss and, therefore, the thermodynamic TDC [20]. The absolute pressure at a crank angle position p(θ) was obtained from the shift of the measured pressure p meas (θ) by the zero-line shift ∆p [17]:…”

Section: Combustion Pressure Processingmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Combustion Pressure Processingmentioning

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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“…2, the burned mass fraction obtained by means of the RW technique is virtually coincident with the curve achieved by means of the Marvin graphical method. It is worth pointing out that if a constant polytropic index equal to 1/2(m c + m e ) was considered for both the compression and expansion phases, as different experimenters have done [8], the pattern of the x b,RW curve in Fig. 2 would not change appreciably.…”

Section: Pressure-based Direct Methods For Combustion Simulationmentioning

confidence: 99%

“…However, a piezoelectric sensor only provides the pressure variation with respect to a reference measurement, that is, only a relative value can be measured. The relative pressure has to be referenced to a known value by means of a pegging procedure in order to obtain an absolute value [8].…”

Section: Introductionmentioning

confidence: 99%

In-cylinder pressure-based direct techniques and time frequency analysis for combustion diagnostics in IC engines

D’Ambrosio

Ferrari

Galleani

2015

Energy Conversion and Management

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“…They have used this simulation for gas emission, fuel economy, and engine performance improvement purposes. Antonopoulos et al [14] have realized an experimental investigation on a single cylinder diesel test engine to identify the aforementioned problem. They have recorded cylinder pressure and instantaneous speed during the tests.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of the Control System of an Internal Combustion Engine Test Unit

Koç

Karayel

Boru

et al. 2014

Advances in Mechanical Engineering

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Accurate tests and performance analysis of engines are required to minimize measurement errors and so the use of the advanced test equipment is imperative. In other words, the reliable test results depend on the measurement of many parameters and recording the experimental data accurately which is depended on engine test unit. This study aims to design the control system of an internal combustion engine test unit. In the study, the performance parameters of an available internal combustion engine have been transferred to computer in real time. A data acquisition (DAQ) card has been used to transfer the experimental data to the computer. Also, a user interface has been developed for performing the necessary procedures by using LabVIEW. The dynamometer load, the fuel consumption, and the desired speed can easily be adjusted precisely by using DAQ card and the user interface during the engine test. Load, fuel consumption, and temperature values (the engine inlet-outlet, exhaust inlet-outlet, oil, and environment) can be seen on the interface and also these values can be recorded to the computer. It is expected that developed system will contribute both to the education of students and to the researchers' studies and so it will eliminate a major lack.

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Effect of instantaneous rotational speed on the analysis of measured diesel engine cylinder pressure data

Cited by 18 publications

References 16 publications

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

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

In-cylinder pressure-based direct techniques and time frequency analysis for combustion diagnostics in IC engines

Design and Implementation of the Control System of an Internal Combustion Engine Test Unit

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