scholarly journals Diagnostics of the Internal Combustion Engines Operation by Measurement of Crankshaft Instantaneous Angular Speed

2019 ◽  
Vol 49 (4) ◽  
pp. 281-295
Author(s):  
Mirosław Dereszewski ◽  
Grzegorz Sikora
Keyword(s):  
Rotational Speed ◽  
Internal Combustion Engines ◽  
High Sensitivity ◽  
Relative Displacement ◽  
Angular Speed ◽  
Injection System ◽  
Combustion Engines ◽  
External Disturbances ◽  
Active Measurement ◽  
First Results

Abstract Diagnostics based on measuring of crankshaft instantaneous rotational speed allows precise location of damage to the injection system and detection of external disturbances. Active measurement of instantaneous rotational speed requires use of equipment with high sensitivity, permanent assembly at the ends of the crankshaft and the analysis of a very large amount of data. Presented method can be used for measurement of torsional vibration of crankshaft, indirectly through simultaneous measurement of the width of the pulses generated by the encoder disks. Momentary, relative displacement of both disks determines the angle of temporary crankshaft twisting. This paper presents first results of pulse width measurement, obtained by using described system.

scholarly journals Exhaust Gas Temperature Measurements in Diagnostics of Turbocharged Marine Internal Combustion Engines Part I Standard Measurements

2015 ◽  
Vol 22 (1) ◽  
pp. 47-54 ◽  
Author(s):  
Zbigniew Korczewski
Keyword(s):  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Technical Condition ◽  
Temperature Measurements ◽  
Injection System ◽  
Exhaust Gas ◽  
Combustion Engines ◽  
Gas Temperature ◽  
Measuring Signal ◽  
Exhaust Gas Temperature

Abstract The article discusses the problem of diagnostic informativeness of exhaust gas temperature measurements in turbocharged marine internal combustion engines. Theoretical principles of the process of exhaust gas flow in turbocharger inlet channels are analysed in its dynamic and energetic aspects. Diagnostic parameters are defined which enable to formulate general evaluation of technical condition of the engine based on standard online measurements of the exhaust gas temperature. A proposal is made to extend the parametric methods of diagnosing workspaces in turbocharged marine engines by analysing time-histories of enthalpy changes of the exhaust gas flowing to the turbocompressor turbine. Such a time-history can be worked out based on dynamic measurements of the exhaust gas temperature, performed using a specially designed sheathed thermocouple. The first part of the article discusses possibilities to perform diagnostic inference about technical condition of a marine engine with pulse turbocharging system based on standard measurements of exhaust gas temperature in characteristic control cross-sections of its thermal and flow system. Selected metrological issues of online exhaust gas temperature measurements in those engines are discusses in detail, with special attention being focused on the observed disturbances and thermodynamic interpretation of the recorded measuring signal. Diagnostic informativeness of the exhaust gas temperature measurements performed in steady-state conditions of engine operation is analysed in the context of possible evaluations of technical condition of the engine workspaces, the injection system, and the fuel delivery process.

IMPACT OF SELECTED BIOFUELS AND DIESEL AS LUBRICANTS ON THE STATISTICAL DISTRIBUTION AND COURSE OF SLIDING FRICTION COEFFICIENTS FOR THE KINEMATIC PAIR 100Cr6-100Cr6

Tribologia ◽  
2019 ◽  
Vol 288 (6) ◽  
pp. 17-23
Author(s):  
Leszek Gil ◽  
Daniel Pieniak ◽  
Edward Kozłowski ◽  
Jarosław Selech
Keyword(s):  
Internal Combustion Engines ◽  
Sliding Friction ◽  
Operating Conditions ◽  
Injection System ◽  
Combustion Engines ◽  
Kinematic Pair ◽  
Injection Equipment ◽  
Eu Member States ◽  
Petroleum Fuels ◽  
Lubricating Properties

One of the functions of engine fuels is the lubrication of engine injection equipment components. The elements of the injection system are lubricated only with the fuel used to power the engine; therefore, the lubricity and its impact on the elements of the engine injection system are an important issue. The share of biofuels to power internal combustion engines is constantly increasing, because EU Member States are required to use fuel with the addition of biocomponents to power vehicle engines. These fuels are more ecological compared to petroleum fuels. Therefore, it is also necessary to identify the lubricating properties of these fuels, which can significantly affect wear processes. In order to identify wear indicators, laboratory tests were carried out to determine the lubricating properties of biofuels based on vegetable oils in relation to diesel fuel. Tribological tests were carried out for the ball-disc friction node of 100Cr6 material, which is most often used in the construction of precision pairs of injection equipment. Comparative tests were carried out for samples immersed in a fuel bath on a CSM tribometer. The friction coefficient waveforms as a function of friction distance and sample load were determined. The measured force values indicate a significant impact of the fuel used on the operating conditions and consumption in the kinematic pair being the subject of the work.

scholarly journals TRIBOLOGICAL PROPERTIES OF AL2O3-ZrO2 COMPOSITE COATING BY LUBRICATION

SINERGI ◽  
2021 ◽  
Vol 25 (3) ◽  
pp. 371
Author(s):  
Riyadh A. Al-Samarai ◽  
Haftirman Haftirman
Keyword(s):  
Electron Microscopy ◽  
Wear Resistance ◽  
Abrasive Wear ◽  
Rotational Speed ◽  
Internal Combustion Engines ◽  
Plasma Coating ◽  
Combustion Engines ◽  
Motor Oil ◽  
20 Nm ◽  
Improve Wear Resistance

Tribological investigations had been carried out on the plasma coating (Al2O3+ ZrO2) below dry and moist abrasion stipulations according to ASTM G134. Commercial motor oil 20W40 was used as a lubricant. At a rotational speed of 200 rpm, all experiments were carried out with ordinary loads of 10, 15 and 20 Nm. Electron microscopy for scanning and AFM was used to study of the layer sprayed with paint. The outcomes of the SEM and AFM evaluation confirmed that abrasive wear is normally decided by abrasive wear in dry abrasive conditions. The lubrication and moisture check confirmed a major reduce in wear from 10 to 15 N below regular loading, and a corrosion fee larger than 15 N was once discovered below regular loading. No impact of lubrication on wear used to discovered at high loading. No impact of lubrication on wear used to be discovered at high loads. It was also cited that the plasma coating manner to improve wear resistance. The experimental statistics acquired in this study are tremendous engineering functions such as reducing equipment and internal combustion engines. 

A Modality to Optimize Common Functioning of a Pressure Wave Supercharger with an Internal Combustion Engine

2015 ◽  
Vol 772 ◽  
pp. 350-354
Author(s):  
Cristian Ioan Leahu ◽  
Anghel Chiru ◽  
Stelian Tarulescu
Keyword(s):  
Rotational Speed ◽  
Pressure Wave ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Driving Speed ◽  
Optimal Values ◽  
Different Characteristics ◽  
Correlation Grade

The functional constructive variants of the Hyprex and Comprex compressors with pressure wave built until the present are reduced in number. Starting from this ascertainment, the paper proposes to highlight the optimization on joint functioning of existing pressure wave supercharger models with internal combustion engines. This is possible due to the efficiency of the supercharging process, realized with such superchargers, which depends on the correlation grade between the rotational speed of the supercharger and the pressure of the exhaust gasses that enter in the compressor's channels, reason due to, a single supercharger model can be capable to supercharge efficiently engines with different characteristics, if the optimal values for the driving speed of the pressure wave supercharger are identified (according to the method proposed in the work) and adapted (according the level of energetic and/or ecologic performances that the engine should achieve) for each type of engine apart.

scholarly journals Innovative research method of the fuel injector that allows to evaluate the efficiency of wood chip drive control systems

2019 ◽  
Vol 254 ◽  
pp. 01010 ◽  
Author(s):  
Łukasz Wargula ◽  
Piotr Krawiec ◽  
Konrad Jan Waluś
Keyword(s):  
Control Systems ◽  
Green Infrastructure ◽  
Research Method ◽  
Internal Combustion Engines ◽  
Wood Chip ◽  
Internal Combustion ◽  
Injection System ◽  
Combustion Engines ◽  
Fuel Injector ◽  
Innovative Research

Exceeding air pollution emission standards in large cities leads to a search of methods of reducing emissions and their neutralization. One of the ways to improve air quality is to increase green infrastructure in urban areas. It leads to an increase in the demand for work machines that process waste from tree care is. Mobile chopping shredders for tree branches are driven by internal combustion engines defined in the standard as drives of non-road mobile machines. In the case of spark-ignition internal combustion engines, these provisions are liberal. This leads to a low level of technical advancement of these drives characterized mainly by the carburettor fuel supply system. The article presents an innovative research method of the fuel injector of the injection unit, enabling mechatronisation of the combustion engine's injection system. The measured values make it possible to evaluate the fuel consumption depending on the developed (patent pending) innovative control systems for the chipper drive. Ultimately, the conducted research will enable the increase of the effectiveness of wood chipping grinding processes and reduction of harmful emissions.

scholarly journals The Use of Multicriteria Inference Method to Identify and Classify Selected Combustion Engine Malfunctions Based on Vehicle Structure Vibrations

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2470
Author(s):  
Krzysztof Prażnowski ◽  
Andrzej Bieniek ◽  
Jarosław Mamala ◽  
Adam Deptuła
Keyword(s):  
Internal Combustion Engine ◽  
Frequency Domain ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Vibration Signal ◽  
Internal Combustion ◽  
Technical Condition ◽  
Engine Block ◽  
Injection System ◽  
Combustion Engines

Internal combustion engines are among the most commonly used propulsion units for drive systems in various industries such as land transportation, maritime transportation, and power generation. Their operation involves a continuous change of technical condition as a result of not only the combustion process but also their operation under conditions of variable load or ambient impact. It is therefore important to monitor the technical condition of internal combustion engines to ensure high performance and reliability over their lifetime. The article presents the test results obtained from incorrect operation of an internal combustion engine as a result of forced failures of the ignition and injection system. On this basis, a multicriteria comparison of the signal analysis of engine block vibrations was made, after the transformation of the signal from the time domain to the frequency domain, by using the induction technique obtained from the operation of decision tree algorithms. For this purpose, the amplitude spectrum in the frequency domain, scaled to absolute values of discretization for which teaching and testing data tables were created for successive harmonics, was determined for the engine block vibration signal being tested. On the basis of the developed algorithm using decision trees, a multicriteria data table was analyzed for which a compatibility path for the analyzed engine block vibration signal is created. In this way, it is confirmed with a specified degree of effectiveness, depending on the point of operation of the engine resulting from its crankshaft speed, that there is a possibility of detecting a preset ignition or injection system malfunction in the technical condition of the internal combustion engine with a probability up to about 72%.

scholarly journals DEVELOPMENT OF PROMISING SYNTHESIS - TECHNOLOGY AVENIR GAZ CONVERTING DIESELS TO GAS ENGINES WITH SPECIAL IGNITION

ScienceRise ◽  
2020 ◽  
pp. 3-9
Author(s):  
Serhii Kovalov
Keyword(s):  
Control Systems ◽  
Diesel Engines ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Injection System ◽  
Intake Manifold ◽  
Maximum Speed ◽  
Combustion Engines ◽  
Microprocessor Control ◽  
Technological Product

The object of research is the multifunctional synthesis technology Avenir Gaz (of various levels of complexity), intended for converting transport diesel engines into spark-ignited gas internal combustion engines (ICE) for operation on liquefied petroleum gas (LPG). Investigated problem: the creation of an affordable synthesis technology in terms of complexity and price, which allows converting operating diesel engines into gas internal combustion engines operating on cheaper and environmentally friendly gas fuel - LPG. Main scientific results: Avenir Gaz synthesis technology (two levels of complexity, qualified as levels "A" and "B") for converting diesel engines into gas internal combustion engines is developed and created. It is shown that the conversion of diesel engines according to the Avenir Gaz synthesis technology is carried out on the basis of the developed electronic microprocessor control systems. And the basis of the control systems is the developed and manufactured two electronic microprocessor control units Avenir Gaz 37 (hereinafter – ECU Avenir Gaz 37). ECUs in accordance with the levels of complexity of synthesis technology are qualified as – ECUs Avenir Gaz 37 "A" and Avenir Gaz 37 "B". It is shown that Avenir Gaz synthesis technology of level "A" allows converting diesel engines into gas internal combustion engines with LPG supply through a gas-air mixer into the inlet pipeline. At the same time, the Avenir Gaz 37 "A" ECU, using the signal from the Hall sensor of the distributor, limits the maximum speed of the gas engine, thereby ensuring its safe operation. And the synthesis technology Avenir Gaz 37 of level "B" allows converting diesel engines into gas internal combustion engines providing group or sequential injection of LPG by electromagnetic gas nozzles (injection system of the Common Rail type) into the intake manifold in the area close to the intake valve. Area of practical use of the research results: converting diesel vehicles, including agricultural machinery (powerful wheeled and tracked tractors, combines, etc.) into spark-ignited gas combustion engines operating on LPG. An innovative technological product: Avenir Gaz synthesis technology, which allows converting the transport diesel engines in operation into gas internal combustion engines for operation on LPG. Scope of application of the innovative technological product: naturally aspirated and supercharged diesel engines with the number of cylinders from one to six, in-line and V-shaped, with a uniform alternation of working strokes.

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