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1

Investigation of novel ceramic materials (Al2O3 and SSiC) for high-pressure pumps delivery sections

Idzior Marek, Karpiuk Wojciech, Smolec Rafał

Combustion Engines

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2024

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R. 63, nr 1

153--160

EN

In this paper, a comparative analysis of structural materials used in the construction of high-pressure pumps delivery sections was carried out. The focus was on a comparison of the ceramic materials such as corundum (alumina, Al2O3) and silicon carbide (solid-state sintered) - SSiC with bearing alloy steel 100Cr6, that is the most common material used to make pistons and cylinders of the delivery section of common rail injection pumps. Simulations performed using the finite element method have proven that ceramic materials have a number of advantages and could therefore be an interesting substitute for materials traditionally used in this area.

2

Ecological aspects of using mixtures of canola oil with n-hexane in diesel engine

Longwic Rafał, Sander Przemysław, Tatarynow Dawid

Combustion Engines

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2022

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R. 61, nr 3

56--60

EN

The article discusses the results of research on the use of canola oil and canola oil with the addition of n-hexane in a compression-ignition engine. An engine with a Common Rail injection system was tested in real traffic conditions on the road and on a chassis dynamometer. The tested fuels were fed to the engine by an additional fuel supply system. An analysis of the effect of the addition of n-hexane on the emission of the main components of toxic exhaust gases was carried out. The proposed solution may contribute to extending the service life of currently used compression ignition engines due to the improvement of the ecological properties of this type of drive sources.

3

Experimental Research on the Influence of the Composition of the Fuel Mixture on the Operating Parameters of a Single-Cylinder Common Rail Diesel Engine

Tucki Karol, Mruk Remigiusz

Advances in Science and Technology. Research Journal

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2022

|

Vol. 16, no 5

100--109

EN

The article presents the laboratory tests results of the influence of the diesel oil content in a mixture with rapeseed oil on the operating parameters of a diesel engine with the CommonRail fuel supply system. Fuel mixtures with a rapeseed content of 0%, 50%, 70%, 100% were used. The article presents the results of tests carried out for various configurations of the object. The measurements included tests of exhaust gases: the content of carbon monoxide, carbon dioxide, hydrocarbons, nitrogen oxides as well as specific fuel consumption and exhaust gas temperature. As a result of the research, it was noticed that the use of rapeseed oil causes a significant increase in fuel consumption and an increase in emissions. At a crankshaft speed of 2500 rpm and a torque generated by the engine crankshaft of 12 Nm, the specific fuel consumption for a 0% rapeseed content is 310 g/kWh. For the same engine operating conditions and the same rapeseed content of the fuel, the fuel consumption for 100% rapeseed content is 330 g/kWh. For the same engine operating parameters, analysis of the carbon dioxide content in the exhaust gas yields a value of 7.8x104 ppm for a rapeseed content of 0%. For the same engine operating conditions and for the oilseed rape content in the fuel is 100% 8.4x104 ppm. The mathematical models describing the effects of engine operating parameters and rapeseed oil content in the mixture on the observed values were created with the Scilab program. The degree of agreement of the determined mathematical models was checked by calculating the coefficient of determination (R2). The results are shown in 3D figures.

4

Environmental Aspects of a Common Rail Diesel Engine Fuelled with Biodiesel/Diesel Blends

Lotko Wincenty, Smigins Ruslans, Tziourtzioumis Dimitrios, Górska Milena

Advances in Science and Technology. Research Journal

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2022

|

Vol. 16, no 5

192--201

EN

The purpose of the study was the research concerning the emissions of limited exhaust gas components of the AVL research engine equipped with Common Rail injection system, fuelled with different biodiesel blends and diesel fuel as reference. In details, the engine was powered with mixtures of rapeseed methyl esters (RME) with DF in the volumetric ratios of 10:90, 20:80, 30:70, 40:60 and 50:50. The tests were performed at: 1200, 1700 and 2200 rpm and the torque T = 5…35 Nm (step 5 Nm). The analysis of the obtained results showed that the emissions of hydrocarbons (HC) from the tested engine fuelled with biodiesel are lower than that of diesel fuel. Carbon monoxide (CO) emissions are also lower, except for low rotational speeds and low engine load T = 5…20 Nm. As for nitrogen oxides (NOx) emissions, it is also lower than that for the diesel fuel, except for high engine loads, in the range above 25 Nm, for each rotation speed of the engine load characteristics. Moreover, in this research it was confirmed that emission of particulate matter (PM) is also slightly reduced for the engine fuelled with tested blends.

5

Emissions from a medium-duty CRDI engine fuelled with diesel-biodiesel blends

Duda Kamil, Wierzbicki Sławomir, Mikulski Maciej, Konieczny Łukasz, Łazarz Bogusław, Letuń-Łątka Magdalena

Transport Problems

|

2021

|

T. 16, z. 1

39--49

EN

In the present work, biofuels produced from different raw fatty materials have been proposed as a dominant fuel component in biodiesel-diesel fuel blends. Biofuels were produced from pork lard and rapeseed oil by alkali transesterification using methyl alcohol. Blends of biofuels in volumetric proportions of 60 and 80% of the biocomponent and the remaining part of the conventional fuel were used in a compression ignition engine designed for medium-duty vehicles. The experiments were conducted at two engine rotational speeds (1500 and 3000 rpm, respectively) and a set of load conditions (50, 100, and 200 Nm, respectively). The tests focused on engine efficiency parameters (brake-specific fuel consumption and brake fuel conversion efficiency) as well as exhaust gas emissions (hydrocarbons, carbon monoxide, and carbon dioxide were determined). The obtained results indicate that blends containing biocomponents produced from pork lard were characterized by superior fuel consumption and efficiency results, compared to blends containing biocomponents produced from rapeseed oil. In terms of exhaust emissions, biocomponents produced from pork lard were also characterized by lower emission of all of the examined components compared to rapeseed methyl ester-diesel blends. This study proposes that fuel components obtained from custom (animal) raw-fatty material can be an effective substitute for commonly used rapeseed oil methyl esters.

6

Evaluation of changes in fuel delivery rate by electromagnetic injectors in a common rail system during simulated operation

Kamiński Mariusz, Budzyński Piotr, Hunicz Jacek, Józwik Jerzy

Eksploatacja i Niezawodność

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2021

|

Vol. 23, no. 2

352--358

EN

The objective of this study was to determine changes in fuel delivery rate by common rail system injectors during their simulated operation on a test stand. Four Bosch injectors used, among others, in Fiat 1.3 Multijet engines were tested. The injectors were operated on a test rig at room temperature for 500 hours (more than 72 million work cycles). During the test, pressure and injection frequency were changed. Changes in the operating parameters were estimated based on obtained injection characteristics and effective flow area determined thereby. The observed changes in fuel delivery rate were compared with results of the surface analysis of control valves and nozzle needles. Despite the stated lack of wear, significant changes in the dynamics of injector operation were observed, particularly at short injection times. Small pilot injections cannot be corrected by the fuel injection control system because they do not affect the changes in torque; however, they do affect the combustion process. This creates conditions for increased emission of toxic exhaust components.

7

Unrepeatability of the Fuel Injection and Combustion Processes in the Diesel Engine Fuelled with Renewable Fuel

Lotko Wincenty

Advances in Science and Technology. Research Journal

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2020

|

Vol. 14, no 4

68--77

EN

Despite the fact that more than a hundred years have passed since the first design of the compression ignition (CI) engine appeared, its optimal design has not yet been achieved. It is still the subject of constant modernisation in order to meet the new expectations of users in terms of its dynamics, economy, and, in recent months, also ecology. The most effective fulfillment of these requirements is achieved through new solutions of the fuel supply system and electronic control of injection and combustion processes. The publication includes the test results obtained on the basis of two engines. One of them is the single-cylinder CI engine AVL5402, and the other one – a threecylinder CI engine AD3.152. The first one is equipped with the Common Rail fuel supply system, electronically controlled with the selenoid injector. The second engine has a CAV distributor fuel injection pump and traditional, mechanical controlled injectors. The paper demonstrates how these two different structural systems for supplying and controlling engine parameters affect the selected indicators of the injection and combustion process. The influence of diesel fuel (DF) and rapeseed oil (RO) feeding the engine in both different injection and control systems on the unrepeatibility of the injection pressure on the maximum combustion pressures in the engine cylinder and, consequently, non-uniformity of the crankshaft rotational movement of the engine were also pointed out. The continuation of the research in this area seems to be expedient. They can be supplemented with statistical models of these phenomena. The results obtained in this way could be helpful in optimising the design of power supply systems and engine combustion chambers.

8

Modelling of Dynamic Interactions in the Fuel Rail for the Aircraft Diesel Engine

Sochaczewski Rafał, Magryta Paweł

Advances in Science and Technology. Research Journal

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2020

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Vol. 14, no 4

168--176

EN

The paper reports a computer model for simulating dynamic responses in fuel rail of aircraft diesel engine. The fuel system was designed for use in a two-stroke compression-ignition engine with opposite pistons. The methodology of building a fuel system model in the AVL Hydsim program and the results of simulation studies were presented. Determination of dynamic phenomena in the fuel rail required the construction of a model of the entire supply system. It is a common rail system with a three-section positive displacement pump and electromagnetic fuel injectors. The system is also equipped with a PID regulator to maintain the present pressure in the fuel rail. For the purposes of the research, two structures of the fuel rail were developed. They differ in dimensions, spacing of the outlet ports and location of the high-pressure connection. The research allowed determining the interactions between the geometry of the fuel rail and the supply method with the fuel pressure and injector mass flow rate. This will optimise the design of the fuel rail for the three-cylinder engine power supply system.

9

Analysis of the applicability of a common rail pump for an aircraft engine

Sochaczewski Rafał, Szlachetka Marcin, Wendeker Mirosław, Karpiński Paweł

Combustion Engines

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2019

|

R. 58, nr 4

192--197

EN

The paper presents an analysis of the possibility of using a common rail pump to supply an aircraft compression-ignition engine. It is an engine with a two-stroke cycle, three cylinders, opposing pistons and 100 kW power. Its each combustion chamber is supply by one or two injectors controlled by electromagnetic valves. In order to assess the possibility of using a common rail pump, four high-pressure pumps were tested on a bench. They are piston pumps differing in the number and geometry of their pumping sections. The analysis included the pumping output, the torque on the pump drive shaft and the power needed to drive the pump. The weight and overall dimensions of the pump were also considered, including the arrangement of the pumping sections and the way the drive is transmitted. The research allowed to optimize the engine power supply system depending on fuel demand and the way the pump is mounted on the engine.

10

An experimental analysis of performance and exhaust emissions of a CRDI diesel engine operating on mixtures containing mineral and renewable components

Duda Kamil, Wierzbicki Sławomir, Mikulski Maciej

Combustion Engines

|

2019

|

R. 58, nr 4

27--31

EN

The manuscript presents a comparative analysis of the performance and emission characteristics of a compression ignition engine equipped with a Common Rail injection system. The engine is fueled with diesel-biodiesel mixtures containing 25% and 50% share (by volume) of renewable components. Conventional diesel is used as a reference. Turkey lard and rapeseed oil are used as raw materials and subjected to the single-stage transesterification process to obtain methyl esters. The experiments are performed on a medium-duty, turbocharged, inter-cooled, Common Rail Direct Injection (CRDI) diesel engine. This study concentrates on one engine speed of 1500 rpm, typical for gen-set applications, and mid-load range from 100 Nm to 200 Nm. The scope of measurements covers the analysis of exhaust gasses concentration and engine efficiency parameters. In addition, the in-cylinder pressure measurements are performed in order to provide insight into the differences in combustion characteristics between examined fuel mixtures. The study reveals that the addition of the renewable component to fuel mixture positively affects a number of examined performance parameters as well as de-creases the concentration of the examined toxic exhaust components, in the majority of cases.

11

Impact of changes in friction factor on the loading of the pumping section in a high pressure injection pump

Smolec R., Bor M., Idzior M., Karpiuk W., Borowczyk T.

Journal of Mechanical and Transport Engineering

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2018

|

Vol. 70, No. 2

53--62

EN

The operational problems of currently manufactured high-pressure injection pumps are related to the use of fuels with inadequate lubricating properties. Even one-time use of fuel that does not meet the requirements assumed by the manufacturer may lead to irreversible changes in the structure of joints, which is tantamount to, among other things, change of the friction coefficient and attenuation in mobile nodes. This article presents and compares the results of dynamic simulation performed in the Autodesk Inventor Professional environment, in which the influence of changes of the friction coefficient value in the mobile nodes of pumps with cam drive and hypocycloid drive on loading of the pumping section was analyzed.

PL

Problemy eksploatacyjne dotyczące współcześnie produkowanych wysokociśnieniowych pomp wtryskowych związane są ze stosowaniem paliw o niedostatecznych właściwościach smarnych. Nawet jednorazowe zastosowanie paliwa niespełniającego założonych przez producenta wymagań może prowadzić do nieodwracalnych zmian w strukturze połączeń, co jest równoważne między innymi ze zmianą współczynnika tarcia i tłumienia w węzłach ruchowych. W artykule przedstawiono i porównano wyniki symulacji dynamicznej wykonanej w środowisku Autodesk Inventor Professional, w której przeanalizowano wpływ zmian wartości współczynnika tarcia w węzłach ruchowych pompy o napędzie krzywkowym oraz napędzie hipocykloidalnym na obciążenie sekcji tłoczącej.

12

Detailed modelling of the internal processes of an injector for common rail systems

Zöldy M., Vass S.

Journal of KONES

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2018

|

Vol. 25, No. 2

416--426

EN

In the last few decades exhaust emissions of road vehicles have decreased dramatically, owing to the more and more stringent emission standards issued by the legislative bodies of different countries, combined with the necessity of cleaner, better performing vehicles from society side. The introduction of Common Rail (CR) injection systems has been a great step towards achieving this target, thanks to its flexibility in fuel injection pressure, timing, and length, along variable engine load conditions. However, it is highly time and resource consuming to set up the injection system for all operating points of different engines, moreover, as the injection is a small scale, high speed process, the behaviour of the internal processes is challenging to measure. The best solution for these problems is to create a detailed model of the injector, where all the hydraulic, mechanic, and electromagnetic subsystems are represented, this way the internal working conditions can be analysed and resources can be saved. In this work, a detailed model of a first generation CR injector for commercial vehicles is presented and validated against needle lift data. The fluid dynamic and mechanic sub-systems are presented in details to thoroughly investigate the working principles of the injector internal parts. The fluid dynamic subsystem contains the chambers, holes, and throttles of the injector, while the mechanic subsystem models the motion and behaviour of the internal parts. The main features of the injector internal working conditions are described and analysed. Apart from the needle lift, these included solenoid anchor, pin and control piston lifts, the control chamber pressure and the mechanical force acting on the anchor. Five test cases were chosen on a medium duty test engine to represent a wide range of operation points from full load to idle and the simulated results were compared to the measured data. The simulated control piston movement accurately matched the measured curves in every test case.

13

Analysis of the procedure of evaluation of the technical condition of a high-pressure common rail fuel pump using a test bed

Bor M., Idzior M., Karpiuk W., Smolec R.

Journal of KONES

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2018

|

Vol. 25, No. 3

65--70

EN

Piston displacement pumps use in common rail fuel injection systems generates very high pressure, reaching even 300 MPa. Maintaining such a high pressure is possible thanks to very precise machining resulting in as little clearance between the piston-cylinder assemblies. Due to very high forces operating in the systems and relatively unfavourable lubrication conditions resulting from using fuel as lubricants, the pumps are subject to wear and consequently lose their operating parameters. The high cost of production of the pumps, resulting from their technological advancement, forced their manufacturers to introduce technologies for diagnosing and regenerating them. The diagnostics consists in removing the pump from the engine and having it verified using a test bed. The first stage consists of evaluating the pump’s flow at null pressure; follow by evaluation of its maximal delivery for the pressure of 100 MPa. The obtained values are compared to the values achieved by a new pump. The effect of negative evaluation on a test bed is the disassembly of the pump, verification of the condition of its parts and replacement of the damaged elements. The authors examined new and used pumps on a tested, aiming to determine the characteristics of delivery of a pump for various pressures. The objective of the research was to identify the actual points in the pump’s operation at which the delivery drops the most due to the wear. The highest difference in delivery was found to exist for the maximal compression pressure. The obtained results were analysed and the possibility of changing the pump diagnostics procedure with the use of a test bed was determined.

14

Diagnostics of common rail components based on pressure curves in the fuel rail

Karczewski M., Koliński K.

Combustion Engines

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2018

|

R. 57, nr 2

3--8

EN

Majority of modern diesel engines is fitted with common-rail (CR) fuel systems. In these systems, the injectors are supplied with fuel under high pressure from the fuel rail (accumulator). Dynamic changes of pressure in the fuel rail are caused by the phenomena occurring during the fuel injection into the cylinders and the fuel supply to the fuel rail through the high-pressure fuel pump. Any change in this process results in a change in the course of pressure in the fuel rail, which, upon mathematical processing of the fuel pressure signal, allows identification of the malfunction of the pump and the injectors. The paper presents a methodology of diagnosing of CR fuel injection system components based on the analysis of dynamic pressure changes in the fuel rail. In the performed investigations, the authors utilized LabView software and a μDAC data acquisition module recording the fuel pressure in the rail, the fuel injector control current and the signal from the camshaft position sensor. For the analysis of the obtained results, ‘FFT’ and ‘STFT’ were developed in order to detect inoperative injectors based on the curves of pressure in the fuel rail. The performed validation tests have confirmed the possibility of identification of malfunctions in the CR system based on the pressure curves in the fuel rail. The ‘FFT’ method provides more information related to the system itself and accurately shows the structure of the signal, while the ’STFT’ method presents the signal in such a way as to clearly identify the occurrence of the fuel injection. The advantage of the above methods is the accessibility to diagnostic parameters and their non-invasive nature.

15

Modeling of selected design characteristics of cam and hypocycloidal drives of high-pressure fuel pumps

Bor Mateusz, Borowczyk Tomasz, Karpiuk Wojciech, Smolec Rafał

Advances in Science and Technology. Research Journal

|

2018

|

Vol. 12, no 2

128--136

EN

The advancement of diesel fuel injection systems is forced by the increasingly stringent exhaust emissions limits. Modern injection systems must generate fuel pressure in excess of 200 MPa, which very often leads to premature wear of the mating components. Generating high pressures results in much force load acting on the pumps. In the case of frequently applied cam-driven pumps, high loads result in significant forces caused by friction. The friction force loads the piston perpendicularly to its axis, which rules out the application of super hard but fragile materials such as ceramics. One of the possible solutions of this problem is the application of unconventional drive systems, the example of which is the hypocycloidal drive. The paper presents the results of simulations comparing selected parameters of the piston motion of the cam-driven pumps and the pumps fitted with hypocycloidal drive. The use of the CAD software also enabled identification of the force acting on the piston (force perpendicular to the piston axis) in the cam-driven pump and its lack in the pump fitted with hypocycloidal drive.

16

Assessment of the possibility of applying ceramic materials in common rail injection systems

Bor Mateusz, Borowczyk Tomasz, Karpiuk Wojciech, Krakowiak Mikołaj, Smolec Rafał

Advances in Science and Technology. Research Journal

|

2018

|

Vol. 12, no 1

312--321

EN

Ceramic materials are currently interesting as substitutes for the metals traditionally used for engineering applications. This paper focuses on a comparison of ceramic materials: corundum (alumina, Al2O3) and silicon carbide (solid-state sintered) – SSiC with bearing alloy steel 100Cr6, i.e. the material used to make pistons and cylinders of pumps in common rail injection systems. The article is divided into two parts. In the first part, the aforementioned materials are characterized and their properties compared from the perspective of their application in piston-cylinder assemblies of injection pumps. The second part concerns analysis conduct by means of the finite element method and a specialized simulation environment, based on comparing ceramic materials and bearing steel. This comparison was conducted by using a CAD strength model of a piston in a specific application, being a pump with CP3 design. Simulation results confirmed the beneficial qualities of ceramic materials – the level of material deformation is lower for ceramics in comparison to steel.

17

Konstrukcja pompy o napędzie hipocykloidalnym w ujęciu zastosowania paliw trudnych

Bor M., Borowczyk T., Idzior M., Karpiuk W., Smolec R.

Prace Naukowe Politechniki Warszawskiej. Transport

|

2017

|

z. 118

7--16

PL

Nowoczesne pompy paliwa generują bardzo wysokie ciśnienia wtrysku, które przekładają się bezpośrednio na występowanie znacznych sił w układzie napędowym pompy smarowanym z wykorzystaniem przetłaczanego paliwa. Zmiana paliwa, a co za tym idzie zmiana jego właściwości fizyko-chemicznych, jest przyczyną wielu uszkodzeń w mechanizmach napędowych pomp typu krzywka-wałek mimośrodowy. Obecnie coraz większy udział w rynku paliw zyskują paliwa alternatywne, z których najbardziej popularnym paliwem są estry metylowe kwasów tłuszczowych oleju rzepakowego. Istnieją również inne paliwa, takie jak wykazująca dobry potencjał aplikacyjny suspensja węglowo-wodna (CWS), której wykorzystanie zostało szerzej opisane w niniejszej publikacji. W artykule została przedstawiona autorska idea zastosowania napędu hipocykloidalnego w konstrukcji pompy paliwa do silników o zapłonie samoczynnym. Konstrukcja ta charakteryzuje się między innymi nowatorskim rozwiązaniem układu napędowego tłoczków sekcji w stosunku do pomp tradycyjnych. Zaproponowano ponadto niezależny układ smarowania elementów ruchowych pompy. Te i inne cechy predysponują to rozwiązanie do zastosowania w pompie paliw alternatywnych w tym tzw. paliw trudnych.

EN

Modern fuel pumps generates very high injection pressures, which directly translate into significant forces in the fuel injection pump driving system. Changing the fuel and thus changing its physicochemical properties causes many damages in the eccentric cam-shaft drive. At present, an increasing share of the fuel market is derived from alternative fuels, of which the most popular fuel is the methyl esters of rapeseed oil fatty acids, while other fuels such as coal-water slurry are available. The article presents the idea of applying hypocycloid propulsion in the construction of a fuel pump for compression-ignition engines. This design is characterized by, among other things, a different solution of the drive of the pumping section compared to traditional pumps. An independent lubrication system for the pump movement components was also proposed. These and other features predispose this solution for use in an alternative fuel pump includingb the so-called difficult fuels.

18

Idea of use of hydraulic booster in high-pressure fuel pump with hypocycloid drive

Bor M., Borowczyk T., Idzior M., Karpiuk W., Smolec R.

Journal of KONES

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2017

|

Vol. 24, No. 3

22--28

EN

Common rail (CR) injection systems have been universally applied in passenger car engines for twenty years. Moreover, they are applied on a wide scale in trucks, machinery and stationary engines. They have many advantages such as very good fuel spraying due to high injection pressure, injection dose distribution to several smaller, or less heat generation compared to traditional systems. At the same time, the use of this type of system involves a number of problems. They are characterized, among other things, by the high cost of manufacturing and the high sensitivity to changes in the quality of the used fuel. The most important component of the common rail injection system is the high-pressure injection pump. The authors propose a new, alternative pump design with the hypocycloid drive – the article presents the issue of using this type of pump. Further sections describe the design of a pump utilizing a hypocycloid mechanism; demonstrate beneficial functional features and present selected results of the assembly's dynamic simulation. The pump is also characterized by the possibility of multiplying the piston's pitch while maintaining its diameter. It makes it possible to obtain much greater discharge per operating cycle. Taking into account the considerable quantity of fuel transferring by the pump, was also possible to propose an idea of use of hydraulic booster in such pump. In this field, the authors have presented schematic diagram of a pressure booster with a description of its operation.

19

Diagnostics of a common rail system using a signal analyser

Wierzbicki S., Stolarski M.

Journal of KONES

|

2017

|

Vol. 24, No. 3

317--324

EN

Self-ignition engines are currently used to drive lorries, agricultural and road construction machines, as well as passenger cars. Common Rail supply systems are widely used in such engines. Arguments for using these systems include the simple construction of a system as well as practically unlimited control of fuel feeding (division of a fuel dose into several portions), which allows for controlling the fuel combustion process. This facilitates optimisation of the combustion process in limiting toxic emissions, which is the main evaluation criterion for modern combustion engines. Operation of an engine with a Common Rail system is controlled by an Electronic Diesel Control (EDC), which is responsible not only for controlling the supply system, but also for the diagnostics of the whole engine. The diagnostic monitors embedded in the controller supervise the operation of the supply system, but also of the whole engine, including the systems responsible for reducing toxic emissions released to the atmosphere, in accordance with the European On Board Diagnostic (EOBD) standard. Unfortunately, despite sophisticated diagnostic functions, defects sometimes occur in vehicles with engines with a CR system, which are not signalled by EOBD systems. In such cases, an additional tool is needed to help a diagnostician to identify the cause of improper operation of an engine. This article presents several examples to describe the diagnostics of a Common Rail system using an analyser of diagnostic electric signals to detect the cause of such defects.

20

The effectiveness of fault detection in common rail injectors examination methods

Kneba Z., Straszak P., Jakóbczyk K.

Combustion Engines

|

2017

|

R. 56, nr 3

49--56

EN

The article presents the effectiveness tests of fault detection in common rail injectors. 40 injectors with different wear levels were tested. Testing was made on two test benches of a completely different design. Research includes comparison of accuracy, reproducibility and testability to detect specific defects. A device was created for visualization of the fuel injector spraying steam.