Diagnosing Faults in the Timing System of a Passenger Car Spark Ignition Engine Using the Bayes Classifier and Entropy of Vibration Signals

CZECH, Piotr

doi:10.20858/sjsutst.2022.116.5

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…The differences between the laboratory values of the NO x emissions and the emission values obtained in the real traffic may be caused due to a different driving dynamics. [6][7][8][9][10]…”

Section: Methodology and Conditionsmentioning

confidence: 99%

Influence of Driving Cycles on Emission Parameters of Vehicles

Lavčák¹,

Tarbajovský²,

Kopas³

et al. 2022

Acta Mechanica Slov.

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The vehicle emissions tests, which are performed using the Portable Emissions Measurement Systems (PEMS), indicate that the diesel cars produce several times more NOx emissions on the road than during certification realised according to the methodology New European Driving Cycle (NEDC). This fact initiated the infamous "dieselgate" affair. It is a wellknown reality that the current emission limits are very strict and therefore a serious problem arises for the motor car producers to meet the demanding emission requirements. The main task of the presented research work was testing of 10 passenger cars with regard to true values of their exhaust gas emissions. These cars were equipped with the diesel engines and gasoline engines that officially meet the Euro 4-6 standards. Based on the measured results it was found that the real NOx emissions of the diesel engines significantly exceed the values measured by NEDC. The results obtained using the NEDC cycle also contradict the findings from two alternative driving cycles: CADC (Common Artemis Driving Cycle; Artemis -Assessment and Reliability of Transport Emission Models and Inventory Systems) and WLTC (Worldwide harmonized Light vehicles Test Cycle).

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Section: Methodology and Conditionsmentioning

confidence: 99%

Influence of Driving Cycles on Emission Parameters of Vehicles

Lavčák¹,

Tarbajovský²,

Kopas³

et al. 2022

Acta Mechanica Slov.

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“…2), resonances from individual harmonic components of excitation can be moved from the operational speed range (OSR) of a mechanical system and herewith the value of dynamic component M D of the transmitted load torque can be reduced, i.a. [22][23][24][25][26][27][28]. Thus, we say that we can tune the mechanical system in terms of the magnitude of torsional vibration.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Determining Optimum Air Pressure Value in Pneumatic Flexible Shaft Coupling

Urbanský¹

2023

Atlantis Highlights in Engineering

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At our workplace, we deal with research in the broad field of machine parts and mechanisms. It is very appropriate and needful to utilize the knowledge gained from our extensive research also in an educational process. Therefore, the aim of this paper is to present one of our educational activities, based on the research in the field of continuous tuning of mechanical systems in terms of torsional vibration magnitude using pneumatic flexible shaft couplings -pneumatic torsional vibration tuners. The main task of the activity -laboratory measurement, prepared for students in the subject "Design of machines and machine elements" is to determine experimentally an optimum air pressure value in a pneumatic coupling, which is mounted in an experimental mechanical system of piston compressor drive for a given operating mode of the system. So the students can apply gained knowledge from multiple subjects, especially from subjects "Dynamics" and "Machine parts" in practice and also gain the practical experience.

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“…The entire issue is very extensive and includes aspects such as safety and lifetime of machines [3][4][5][6][7][8][9] and protection of workers against noise and vibration [10,11]. In the field of piston combustion engines, as a source of vibration, emphasis is placed on improving their efficiency and reducing emissions [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Novel Design of Variable Stiffness Pneumatic Flexible Shaft Coupling: Determining the Mathematical-Physical Model and Potential Benefits

Kaššay,

Grega,

Urbanský

et al. 2023

Machines

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Presently, mechanical system vibroisolation is becoming increasingly important. One of the new approaches is semi-active vibroisolation using elements capable of changing a selected mechanical property. These include, among others, pneumatic flexible shaft couplings capable of changing torsional stiffness during operation. The main goal of the article is to examine the potential advantages of a newly patented pneumatic coupling over a current type with the same pneumatic element arrangement. For comparison, parameters determinable from static load characteristics were selected. These parameters are maximum twist angle and torque, average torsional stiffness, and the percentage of torque transmitted by the bellows rubber shell. In all cases, the new coupling had better properties. Since the prototype of the new coupling has not yet been produced, its parameters were determined from its mathematical-physical model. The article contains a full procedure to obtain the static load characteristic of a new coupling type, beginning with the determination of air bellows force/height and volume/height characteristics, then optimum sizes of coupling with regards to the operating range of elements, the dependency of element height on the coupling’s twist angle, and finally the computation of the static load characteristic considering isothermal gas compression. The presented procedure can be applied to any pneumatic bellows where the force/height characteristics of different pressures are given.

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Diagnosing Faults in the Timing System of a Passenger Car Spark Ignition Engine Using the Bayes Classifier and Entropy of Vibration Signals

Cited by 4 publications

References 10 publications

Influence of Driving Cycles on Emission Parameters of Vehicles

Influence of Driving Cycles on Emission Parameters of Vehicles

Determining Optimum Air Pressure Value in Pneumatic Flexible Shaft Coupling

Novel Design of Variable Stiffness Pneumatic Flexible Shaft Coupling: Determining the Mathematical-Physical Model and Potential Benefits

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