Wyniki wyszukiwania - BazTech

1

Chaotic behavior in the rotational speed of internal combustion engines

Rudzinskyi Volodymyr, Lomakin Volodymyr, Melnychuk Serhii, Yemets Bogdan, Lyashuk Oleg, Ryabchuk Oleksandr, Slobodian Liubomyr

Zeszyty Naukowe. Transport / Politechnika Śląska

|

2025

|

z. 127

237--255

EN

This study investigates the chaotic behavior in the rotational speed of internal combustion engines. High-precision measurements of engine rotational speed were taken at discrete intervals of 0.36 degrees with time measured to a precision of 41 nanoseconds. The data was analyzed using various techniques from chaos theory and nonlinear dynamics, including Lyapunov exponent calculations, phase space reconstruction, and power spectral density analysis. Results reveal that engine rotational speed exhibits complex, chaotic behavior across different operating conditions. Lyapunov exponents ranged from -0.004 to 0.024, indicating varying degrees of chaos from near-stability to strong chaotic behavior. The strongest chaos was observed at certain idle speeds, while full gas conditions showed milder but persistent chaotic characteristics. The study demonstrates that rotational speed fluctuations in internal combustion engines go beyond simple periodic or random variations, suggesting that traditional linear models may be insufficient for accurately predicting and controlling engine behavior. These findings have significant implications for engine design, control strategies, and diagnostics. The authors provide access to the original datasets and analysis code, encouraging further research and collaboration in this field. This work contributes to a deeper understanding of engine dynamics and may lead to the development of more sophisticated, nonlinear approaches to engine analysis and optimization.

2

Using the diesel engines in machines and vehicles in underground mine workings, especially in explosive atmospheres

Kaczmarczyk Krzysztof, Lesiak Krzysztof, Kurcz Stanisław

Mining Machines

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2025

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vol. 43

131--143

EN

Efficient transport of materials and personnel is crucial for an efficient operation of a mining plant. Transport powered by diesel engines is widely used in mines due to its mobility. This article outlines the requirements that diesel engines operating underground must meet. These requirements particularly impact the design of engines operating in mine workings with a potentially explosive atmosphere. Due to operation in confined spaces, the quality of the engine's exhaust gases is also crucial, and increasingly stringent requirements have been imposed over the years. This article discusses the design of a diesel engine intended for operation in potentially explosive atmospheres, in light of the current requirements. Commonly used methods for improving the exhaust gases quality in surface engines are discussed, as well as the technical challenges associated with adapting them to engines operating underground. An example engine introduced to the market by a leading mining machinery manufacturer is presented.

3

Vehicle exhaust emissions in the light of modern research tools: synergy of chassis dynamometers and computational models

Zimakowska-Laskowska Magdalena, Kozłowski Edward, Laskowski Piotr, Wiśniowski Piotr, Świderski Andrzej, Orynycz Olga

Combustion Engines

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2025

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R. 64, nr 1

145--154

EN

Assessing vehicle emissions is crucial for understanding their environmental impact and developing effective emission reduction strategies. This article discusses modern research tools that combine traditional laboratory measurements on chassis dynamometers with advanced theoretical models. Probabilistic methods, including stochastic processes based on Markov and semi-Markov chains, are important tools for modelling driving cycles, considering the variability of road conditions and driver behaviour. The article also presents mathematical approaches to emission data analysis, considering both the states of the technical system and the transitions between them, which allows for precise modelling of real vehicle operating conditions. Ultimately, the synergy of experimental measurements with computational modelling offers a more complete and accurate tool for assessing pollutant emissions, which is crucial in global efforts to improve air quality.

4

The influence of ambient temperature on exhaust emissions during cold start in the homologation test

Zimakowska-Laskowska Magdalena, Kozłowski Edward, Wiśniowski Piotr, Żbik Ksawery, Świderski Andrzej, Rostek Ewa, Madleňák Radovan

Combustion Engines

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2025

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R. 64, nr 4

50--58

EN

The cold start phase in an ICE is susceptible to changing environmental conditions, especially ambient temperature. The work aimed to analyse the influence of different thermal conditions on the concentration of pollutants and operating parameters of the drive unit during a cold start. The tests were conducted on a chassis dynamometer at various ambient temperatures. The same homologation cycle was used in both cases, allowing direct comparison of results. The concentrations of HC, CH₄, CO₂, and NOx were recorded, as well as the basic operating parameters of the engine: coolant temperature, rotational speed, load, and throttle position. Based on empirical data, mathematical models describing the influence of ambient temperature on the dynamics of emissions and stabilisation of engine operation were developed. Relationships were identified that allow for assessing the time to reach steady-state conditions as a function of starting temperature. The results of the analysis provide the basis for developing a start control strategy in climatically variable conditions. They can support the development of adaptive emission control systems compliant with current and future legal standards.

5

The effect of operating factors on the behavior of the combustion engine valve timing system

Siczek Krzysztof, Woźniak Marek, Rylski Adam, Stachurski Wojciech

Combustion Engines

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2025

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R. 64, nr 2

136--149

EN

Issues related to the various driving gears of the valve trains were discussed, along with the factors affecting them. The study was focused on the effect of disassembling the toothed pulley shrink-fitted to the crankshaft journal, followed by their assembly via pressure fitting. The roughness parameters for surfaces of a new and worn toothed pulley and worn crankshaft journal, as well as their hardness values, were measured. The model for calculations of friction coefficient, contact pressure, and friction torque carried by the contact zone was developed. It was found that the disassembling and assembling of the analyzed components can significantly weaken the interference between them. The weakening was accompanied by a decreased contact pressure. The plastic saturation occurred in the contact zone. The corresponding values of the friction coefficient were much higher than those for elastic stress in the contact zone. The friction coefficient values for the plastic saturation conditions differ from each other by up to 10%. Although all values of torque loading the worn toothed pulley exceed values of friction torque carried by the contact zone under plastic saturation, the displacement of the toothed pulley about the crankshaft journal can occur due to possible changes in the friction coefficient in the contact zone. The friction coefficient values can be lowered due to the presence of oxides, impurities, and engine oil droplets introduced into the contact zone by way of the oil mist present inside the engine block.

6

Simulation study of the effect of ethanol content in fuel on petrol engine performance and exhaust emissions

Laskowski Piotr, Zimakowska-Laskowska Magdalena

Combustion Engines

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2025

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R. 64, nr 2

129--135

EN

In response to the growing problems associated with road transport emissions, increasing emphasis is being placed on biofuels and bio-additives as a more ecological alternative to traditional fossil fuels. Biofuels, produced from renewable raw materials such as oil plants, cereals, or organic waste, aim to reduce greenhouse gas emissions and limit the consumption of non-renewable raw materials. The introduction of additives to fuels can have a positive effect on reducing harmful substances in exhaust gases. Still, the effectiveness of this solution depends on many factors, such as the type of bio components and the design of the engines. The article discusses research on bio-additives impact on exhaust emissions, with particular emphasis on combustion processes and the formation of harmful substance emissions. It presents two complementary modelling methods: COPERT, which allows for estimating emissions in real conditions, and Diesel-RK, which simulates engine combustion processes for a detailed analysis of emission mechanisms. The combination of these tools allowed for a precise assessment of the impact of biofuels on pollutant emissions and may be an essential step towards optimising engine designs for more ecological solutions. Despite certain technological and economic limitations, using bio-additives to fuels can significantly reduce emissions from road transport, accelerating the implementation of global environmental protection and sustainable development goals.

7

Optimization of the cooling system in a prototype VCR engine using CFD analysis

Jakubowski Mirosław

Combustion Engines

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2025

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R. 64, nr 3

36--43

EN

The cooling system of an internal combustion engine affects various key parameters, including ignition delay, fuel evaporation, and the compression-expansion process. The geometry of its components impacts both cooling efficiency and the energy demand of the coolant pump. This paper presents CFD simulation results of coolant flow through selected elements of a modified cooling system in a prototype engine. Due to design changes in the power unit, the original coolant outlet manifold required redesign. Three manifold variants were analyzed under two coolant types and two back pressure levels. Flow patterns were evaluated using streamlines and velocity distributions in selected cross-sections. The applied manifold modification significantly increased coolant velocity. In the analyzed cases, the local resistance coefficient rose to values as high as 9. For version mod2, the risk of turbulence was higher with a water-glycol mixture than with water. For version mod1, turbulence sensitivity to coolant type was negligible.

8

Analysis of the filtration process of inlet air to an internal combustion engine in a two-stage filter

Dziubak Tadeusz

Combustion Engines

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2025

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R. 64, nr 4

87--102

EN

The destructive effect of mineral dust grains (SiO2 and Al2O3) on the accelerated abrasive wear of engine connections was demonstrated. It was shown that the use of two-stage (multi-cyclone-baffle) air intake filters for motor vehicle engines used in conditions of high air dustiness is necessary. The aim of the work was a theoretical and experimental analysis of the properties of paper filters operating in series behind a cyclone and without a cyclone. An original research methodology was used, which consisted of the simultaneous testing of a single cyclone and a paper filter with an appropriately selected surface area. The system tests (cyclone-paper filter) were carried out using conditions that corresponded to the actual filtration conditions in a two-stage air filter, including the filtration speed in the paper bed, the dust concentration in the air sucked into the engine, and the average cyclone inlet speed. The basic filtration characteristics of filtration efficiency, accuracy, and pressure drop of two paper filters were determined as a function of the dust mass fed to the system (cyclone-paper filter) or directly to the characteristic filter. It was found that the paper filter operating in series behind the cyclone achieves four times longer operating time, limited by a specific value of permissible resistance. In the initial (short) filtration period, lower filtration efficiency values were obtained than the required value of 99.5%. On the other hand, dust grains with a maximum size of 13.5 μm were found in the air behind the paper filter. The required filtration accuracy of the engine intake air is in the range of 2-5 μm. For this reason, the initial air filtration period is an undesirable phenomenon and may cause accelerated engine wear.

9

Analysis of the influence of air pollution in the intake air of the combustion engine on the wear of its components and operation

Dziubak Tadeusz

Transport Samochodowy

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2024

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T. 70, nr 2

3--21

EN

It has been shown that the primary pollutant of engine intake air is road dust, the main component of which is mineral dust carried from surrounding areas, where it is generated by the operation of offroad vehicles, work machinery and agricultural machinery. It has been shown that the two main components of mineral dust silica (SiO2) and alumina (Al2O3), the proportion of which in the dust reaches 95%, have at the same time the highest hardness, which determines the wear of engine components. It has been shown that the greatest wear of two frictionally cooperating surfaces is caused by dust grains with sizes equal to the thickness of the oil film at any given time. It was shown that all dust grains with grain sizes above 1 µm cause accelerated wear of two mating components, but the greatest wear is caused by grains in the 5÷20 µm range. The effect of excessive wear of the pistonpiston ringcylinder (P-PR-C) association of the engine, resulting from actual vehicle operation and bench tests, on the decrease in compression pressure, the intensity of exhaust gas purging into the oil sump and engine power is presented. It was shown that the primary component of oil contamination is mineral dust, which penetrates from the intake air into the oil located on the surface of the cylinder liner, from where the rings scrape it into the oil sump. The effect of dust particles on the erosive wear of the compressor and turbine in the engine supercharger is discussed. The results of an empirical study of the effect of deposition of mineral dust grains and oil on the measuring element of the air flow meter on the change in the value of the generated output voltage, which is a measure of the air flow into the engine, are presented.

PL

Wykazano, że podstawowym zanieczyszczeniem powietrza wlotowego do silnika jest pył drogowy, którego głównym składnikiem jest pył mineralny naniesiony z okolicznych obszarów, gdzie generowany jest przez działanie pojazdów terenowych, maszyn roboczych oraz maszyn rolniczych. Wykazano, że dwa podstawowe składniki pyłu mineralnego krzemionka (SiO2) i korund (Al2O3), których udział w pyle dochodzi do 95%, mają jednocześnie największą twardość, co decyduje o zużyciu elementów silnika. Wykazano, że największe zużycie dwóch współpracujących tarciowo powierzchni powodują ziarna pyłu o rozmiarach równych w danej chwili grubości filmu olejowego. Wykazano, że wszystkie ziarna pyłu o rozmiarach ziaren powyżej 1 µm powodują przyspieszone zużycie dwóch współpracujących elementów, jednak największe zużycie powodowane są przez ziarna z zakresu 5÷20 µm. Przedstawiono wpływ nadmiernego zużycia skojarzenia tłok-pierścienie tłokowe-cylinder (T-P-C) silnika, wynikającego z rzeczywistej eksploatacji pojazdów oraz badań stanowiskowych na spadek ciśnienia sprężania, intensywność przedmuchu spalin do miski olejowej i moc silnika. Wykazano, że podstawowym składnikiem zanieczyszczeń oleju jest pył mineralny, który przenika z powietrza wlotowego do oleju znajdującego się na powierzchni tulei cylindrowej, skąd pierścienie zgarniają go do miski olejowej. Omówiono wpływ cząstek pyłu na zużycie erozyjne sprężarki i turbiny w urządzeniu doładowującym silnika. Przedstawiono wyniki badań empirycznych wpływu osadzania się ziaren pyłu mineralnego i oleju na elemencie pomiarowym przepływomierza powietrza na zmianę wartości generowanego napięcia wyjściowego będącego miarą strumienia powietrza płynącego do silnika.

10

Model symulacyjny układu napędowego pojazdu z silnikiem spalinowym i automatyczną skrzynią biegów

Szost Kinga

Przemysł Chemiczny

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2024

|

T. 103, nr 12

1548--1552

PL

Przedstawiono model matematyczny układu napędowego pojazdu, który składa się z silnika spalinowego o zapłonie iskrowym i czterech suwach pracy oraz pięciostopniowej skrzyni biegów i przekładni głównej. W modelu silnika spalinowego wykorzystano równania dynamiki oraz podstawowych procesów chemicznych. Uwzględniono uproszczony model matematyczny nadwozia pojazdu w celu weryfikacji poprawności działania całego układu. Zaprojektowano system sterowania skrzynią biegów. Przedstawiono wyniki badań symulacyjnych.

EN

A math. model of a vehicle’s drive system was presented, which consists of a 4-stroke combustion engine with spark ignition and a 5-speed gearbox with main transmission. Dynamics eqns. and simple chem. processes were used in the model of the combustion engine. A simplified math. model of the vehicle body was included and the control system for the gearbox was designed.

11

Wykorzystanie systemów CAX w projektowaniu układu wydechowego dwusuwowego silnika spalinowego

Samul Wojciech, Małecki Dominik, Stefański Patryk

Przegląd Techniczny : Gazeta Inżynierska

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2024

|

nr 9

16--20

PL

Artykuł prezentuje wykorzystanie systemów CAD w projektowaniu układu wydechowego motocyklowego silnika spalinowego. Autorzy prezentują znaczenie zastosowania skanowania przestrzennego oraz modelowania 3D do wykonania układu wydechowego motocykla Yamaha YZ 85. Zaprezentowane zostały również badania trakcyjne silnika na hamowni motocyklowej z użyciem zaprojektowanego wydechu.

EN

The article presents the use of CAD systems in the design of the exhaust system of a motorcycle combustion engine. The authors present the importance of using spatial scanning and 3D modeling to create the exhaust system of the Yamaha YZ 85 motorcycle. Engine traction tests using the designed exhaust on a motorcycle dynamometer were also presented.

12

Structural and Material Analysis of an Electromagnetic Actuator for Pressure Control in an Internal Combustion Engine

Mamala Jarosław, Graba Mariusz, Prażnowski Krzysztof, Tomczuk Bronisław, Waindok Andrzej

Pomiary Automatyka Robotyka

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2024

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R. 28, nr 1

5--13

EN

The article describes the process of selecting the design parameters of the electromagnetic actuator, which was used to regulate the compression pressure in the cylinder of an internal combustion engine. The electromagnetic actuator was installed in the timing system of a single-cylinder internal combustion engine, which forced its basic design parameters in terms of force and frequency of operation. For the electromagnetic actuator in question, field calculations of the esign variants of the linear electromagnetic actuator for two types of materials were conducted. The finite element method was applied to the computer-aided design of electromagnetic actuators. The influence of the magnetic circuit and the dimensions of the windings on the distribution of the magnetic field were analyzed. The thickness and height of the magnetic field induces, and the dimensions of the stator poles have been changed while maintaining the same external dimensions of the actuator for design reasons. All this work was aimed at improving the performance of the internal combustion engine in terms of improving efficiency in terms of partial engine loads. In this area, the internal combustion engine is characterized by low efficiency, significantly deviating from the maximum, and at the same time, during normal operation of vehicles is the area most often exploited.

PL

W artykule opisano proces doboru parametrów konstrukcyjnych siłownika elektromagnetycznego, który posłużył do regulacji ciśnienia sprężania w cylindrze silnika spalinowego. Siłownik elektromagnetyczny został zamontowany w układzie rozrządu jednocylindrowego silnika spalinowego, co wymusiło jego podstawowe parametry konstrukcyjne w zakresie siły i częstotliwości pracy. Dla omawianego siłownika elektromagnetycznego przeprowadzono obliczenia porównawcze wariantów konstrukcyjnych liniowego siłownika elektromagnetycznego dla dwóch rodzajów materiałów. Do komputerowego wspomagania projektowania siłowników elektromagnetycznych zastosowano metodę elementów skończonych. Przeanalizowano wpływ obwodu magnetycznego i wymiarów uzwojeń na rozkład pola magnetycznego. Grubość i wysokość indukowanego pola magnetycznego oraz wymiary biegunów stojana zostały zmienione przy zachowaniu tych samych wymiarów zewnętrznych siłownika ze względów konstrukcyjnych. Wszystkie te prace miały na celu poprawę osiągów silnika spalinowego w szczególności poprawy sprawności w zakresie częściowego obciążenia silnika. W tym obszarze silnik spalinowy charakteryzuje się stosunkowo niską sprawnością, znacznie odbiegającą od maksymalnej, a jednocześnie w czasie normalnej eksploatacji pojazdów jest obszarem najczęściej eksploatowanym.

13

Issues in the conservation and restoration of powertrains as engineering art monuments

Rymaniak Łukasz, Ratajczyk Franciszek, Szymlet Natalia, Woźniak Filip

Combustion Engines

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2024

|

R. 63, nr 3

93--97

EN

The article discusses issues related to the behavior of powertrains understood as monuments of engineering art. The theoretical part analyzed the most important issues related to the maintenance and renovation of vehicles, their share in Poland in the age category, as well as the regulations regarding the classification of historic vehicles. The next part of the article presents the renovation process of two powertrains - the K-750 motorcycle and the Volkswagen Type 117 passenger car, along with a short production history. Then, recommended procedures for unique objects were discussed in the context of their state of preservation and occurrence based on the authors' experience.

14

Efficiency optimization of a vehicle combustion engine by the adjustment of the spark advance angle

Kamiński Adam, Krakowian Konrad, Skrętowicz Maria, Kupski Mateusz

Combustion Engines

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2024

|

R. 63, nr 1

10--14

EN

Changing the ignition advance angle has a significant impact on the performance of a combustion engine. Optimization of ignition advance angle is a major task of adjusting the engine concerning emission standards, fuel consumption, torque value, etc. The results of the research showed that the process of optimizing the ignition advance curve can noticeably increase engine efficiency, as well as torque and power output from the engine while reducing fuel consumption as a result of lower indications of the air flow mass per second from MAF sensor (mass air flow sensor). The highest impact of the ignition advanced angle modifications can be seen in the area of the highest volumetric efficiency of the tested combustion engine. Almost no impact is observed within high engine speed levels. Simultaneously increasing engine load and rotation speed increases the possibility of engine knocking, which has a devastating effect on engine durability.

15

Development and research of a hybrid power unit for ultralight aircraft: an innovative approach to energy efficiency and operational flexibility

Wróblewski Piotr, Świątek Piotr, Kachel Stanisław, Zyska Tomasz

Combustion Engines

|

2024

|

R. 63, nr 2

83--96

EN

This scientific article presents an innovative concept of a hybrid power unit designed for ultralight aircraft, with the aim of improving energy efficiency and operational flexibility. As part of the development of the system, the construction of the combustion unit and the electric motor / generator, which are the key elements of this solution, was described. The advanced internal combustion engine controller and the bi-directional energy conversion converter have been developed and built to enable optimal cooperation of both energy sources. In order to carry out experimental research on the developed system, a special test stand was built on which a prototype drive unit was mounted. The results of the research include preliminary performance characteristics of the prototype drive unit and an analysis of the achievements that indicate the potential benefits of using such a hybrid drive unit. The article also summarizes the conclusions and recommendations for further work on improving this innovative solution.

16

Composition, features, problems, and treatment related to cooling fluid - a review

Stajuda Łukasz, Levchenko Dmytro, Kubiak Przemysław, Siczek Kamil, Bogusławski Grzegorz, Kuchar Maciej, Woźniak Marek, Szymczyk Mateusz, Ozuna Gustavo, Siczek Krzysztof

Combustion Engines

|

2024

|

R. 63, nr 1

106--125

EN

Vehicle coolant is one of the most important operating fluids. Along with changes in the design of engines, the composition of the coolant has also changed. The main function of the coolant is heat transfer (HT). It absorbs up to one-third of the heat energy generated by the engine. The coolant is also responsible for protecting the cooling system from damage caused by corrosion, scaling and deposits. The unfavorable working environment of the engine is also affected by smaller capacities of the cooling systems (CSs) of the drive units, extreme temperatures and increased pressure in the CS, enhancing the importance of the fluid composition. The coolant must be replaced every three years or 100,000 kilometers or every five years or 250,000 kilometers with the Organic Acid Technology (OAT). It is worth remembering that coolant of unknown composition or low quality used for a long time can expose the system to engine overheating, corrosion, deposits and restriction of liquid flow. This can lead to engine failure, in extreme cases even engine seizure. Currently, many types of fluids, including nanocoolants with different compositions, are available on the cooling market. The article presents these fluids, describe the most common failures of CSs, present the currently used methods of fluid replacement in the engine and proposes an innovative method based on the pressure method, which allows both replacing the fluid in the entire system and cleaning it.

17

Combustion stability for early and late direct hydrogen injection in a dual fuel diesel engine

Siadkowska Ksenia, Barański Grzegorz

Combustion Engines

|

2024

|

R. 63, nr 1

89--98

EN

The paper presents an analysis of the experimental results of direct hydrogen injection in a dual-fuel diesel engine. The test object is a four-cylinder, four-stroke ADCR engine. The parameters like: indicated mean effective pressure, peak pressure, angle of maximum pressure and released heat were analyzed. Statistical analysis of the obtained results was carried out for each cylinder separately for four different hydrogen doses. Both early and late direct hydrogen injection were analyzed. The significance of the differences for each of the analyzed parameters and type of injection was determined. The stability of the combustion process was evaluated using the coefficient of variation CoV(IMEP).

18

Advanced fuel system with gaseous hydrogen additives

Shalapko Denys, Radchenko Mykola, Pavlenko Anatoliy, Radchenko Roman, Radchenko Andrii, Pyrysunko Maxim

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2024

|

Vol. 72, nr 2

art. no. e148837

EN

The advancement of contemporary internal combustion engine technologies necessitates not only design enhancements but also the exploration of alternative fuels or fuel catalysts. These endeavors are integral to curbing the emission of hazardous substances in exhaust gases. Most contemporary catalyst additives are of complex chemical origins, introduced into the fuel during the fuel preparation stage. Nonetheless, none of these additives yield a significant reduction in fuel consumption. The research endeavors to develop the fuel system of a primary marine diesel engine to facilitate the incorporation of pure hydrogen additives into diesel fuel. Notably, this study introduces a pioneering approach, employing compressed gaseous hydrogen up to 5 MPa as an additive to the principal diesel fuel. This method obviates the need for extensive modifications to the ship engine fuel equipment and is adaptable to modern marine power plants. With the introduction of modest quantities of hydrogen into the primary fuel, observable shifts in the behavior of the fuel equipment become apparent, aligning with the calculations outlined in the methodology. The innovative outcomes of the experimental study affirm that the mass consumption of hydrogen is contingent upon the hydrogen supply pressure, the settings of the fuel equipment, and the structural attributes of the fuel delivery system. The modulation of engine load exerts a particularly pronounced influence on the mass admixture of hydrogen. The proportion of mass addition of hydrogen in relation to the pressure of supply (ranging from 4–12 MPa) adheres to a geometric progression (within the range of 0.04–0.1%). The application of this technology allows for a reduction in the specific fuel consumption of the engine by 2–5%, contingent upon the type of fuel system in use, and concurrently permits an augmentation in engine power by up to 5%. The resultant economic benefits are estimated at 1.5–4.2% of the total fuel expenses. This technology is applicable across marine, automotive, tractor, and stationary diesel engines. Its implementation necessitates no intricate modifications to the engine design, and its utilization demands no specialized skills. It is worth noting that, in addition to hydrogen, other combustible gases can be employed.

19

Improving the efficiency of the Honda V6 engine cylinder deactivation system

Hnyp Mariia, Melnyk Vasyl, Baidauletova Madina, Bembenek Michał

Archives of Engineering Knowledge

|

2024

|

T. 10, Nr 1

72--78

EN

In modern conditions of operation of cars, especially in megacities, a significant proportion of modes are low loads and idling. Operation in such modes is accompanied by increased specific fuel and lubricant consumption, increased specific emissions of toxic components of exhaust gases, etc. There are a number of methods and means of increasing the efficiency of idling and low load modes. Today, one of the promising methods for solving the problem of increasing efficiency and reducing the concentration of toxic products in exhaust gases at partial loads and idling is the method of cylinder shutdown with valve timing control. The study of indicator and specific performance indicators of the internal combustion engine was carried out using a method that allows determining the impact of switching off any number of cylinders on the power and fuel economy indicators of the engine. Due to the shutdown of cylinders from 1 to 3, an increase in the average indicator pressure by 10.5% was recorded. Due to the increase in the average indicator pressure in the cylinders, the indicator efficiency increases. The shutdown of cylinders in the Honda V6 engine with an engine capacity of 3.5 liters from 1 to 3 leads to an increase in the indicator efficiency of up to 10.5%. According to the results of the study of the effective performance indicators of the Honda V6 engine with a volume of 3.5, it was found that the average effective pressure is 0.981 MPa, the specific effective fuel consumption is 0.260, and the effective efficiency is 0.3142, and they remain practically unchanged.

20

Precision diagnostics of a diesel engine under agricultural tractor operating conditions

Vrublevskyi Oleksandr, Gonera Jarosław, Napiórkowski Jerzy

Transport Problems

|

2023

|

T. 18, z. 2

181--194

EN

This paper presents a method for the precise diagnosis of a diesel engine in an agricultural tractor based on the analysis of efficiency changes and parameters characterizing the process of fuel-air mixture preparation. We proposed that the technical condition be identified based on available data from the engine controller, as this enables the implementation of precise online diagnostics of an agricultural tractor. The method was verified using the original cycle, during which we simulated several engine defects leading to a change in conditions and quality of the processes of creating and burning the fuel/air/flue gas mixture. In the paper, we justified the selection of the points at which the engine parameters were measured, as they provide the most information and allow for efficient identification of damage. These results indicate the possibility of damage identification without the use of the diagnostic cycle in the operation of operator-driven vehicles and autonomous vehicles.