Sławomir Wierzbicki

University of Warmia and Mazury in Olsztyn · Department of Mechatronics

Solid biofuels, including straw as production residue, are still the largest energy feedstock in the structure of primary energy production from renewable energy sources. However, the properties of straw as a solid biofuel can vary depending on the species from which it was produced and the harvest period and year. Therefore, this study aimed to as...

Solid biofuels, including wood chips, are still the most important feedstock in the structure of primary energy production from renewable energy sources. Wood chips are derived mainly from forests and the wood industry, including sawmills. However, the considerable diversity of chipper types results in great differences in their final production ef...

Efficient fuel injection and exhaust gas cleaning systems are needed to promote the development of high-performance internal combustion systems and decrease greenhouse gas emissions. Electronically controlled injection systems enable nearly unlimited control over system components whose operation is limited by the inertia of moving parts and other...

Natural gas is one of the potential combustion engine fuels whose proportion in the overall energy balance is expected to increase. Owing to some of its properties, its use requires a dual-fuel supply system; thus, the use of natural gas as a fuel for diesel engines is currently limited. Systems that supply gas fuel to diesel engines do not usually...

The paper presents a damage identification method of technical objects with the use of multidimensional analyses. The studied objects were rolling bearings tested on a laboratory test stand as well as vehicle wheel rims. The rims were examined by an Automated Tester. A group of variables describing the condition of the bearings included basic param...

The continuous need for systematization and open dissemination of knowledge on Renewable Fuels intended for use in Internal Combustion Engines forms the premise of the presented Special Issue titled "Renewable Fuels for Internal Combustion". Experts in the field were encouraged to share their latest findings in the form of original research papers,...

The optimization of the combustion process in internal combustion engines requires a thorough knowledge of the phenomena that take place inside injection system components responsible for fuel delivery. The beginning and end of fuel injection is difficult to accurately determine because fuel is delivered at very high pressure, the displacement of m...

This paper aims to evaluate the impact of cetane improvers on the combustion, performance and emission characteristics of a compression ignition engine fueled with a 20% peppermint bio-oil/diesel blend (P20). It is hypothesized that the low viscosity and boiling point of peppermint oil could improve the atomization characteristics of the fuel. Howe...

The development of internal combustion engines involves various new solutions, one of which is the use of dual-fuel systems. The diversity of technological solutions being developed determines the efficiency of such systems, as well as the possibility of reducing the emission of carbon dioxide and exhaust components into the atmosphere. An innovati...

In the present work, biofuels produced from different raw fatty materials have been proposed asa dominant fuel component in biodiesel–diesel fuel blends. Biofuels were produced from pork lard and rapeseed oil by alkali transesterification usingmethyl alcohol. Blends of biofuels in volumetric proportions of 60 and 80% of the biocomponent and the rem...

Article citation info: DUDA, K., WIERZBICKI, S., MIKULSKI, M. An experimental analysis of performance and exhaust gasses concentration of a CRDI diesel engine operating on mixtures containing mineral and renewable components. Combustion Engines. 2019, 179(4), 27-31. DOI: 10.19206/CE-2019-404 The manuscript presents a comparative analysis of the...

Limited oil resources, combined with the need to stem the toxic emissions to the atmosphere, necessitate seeking alternative fuels for combustion engines. According to forecasts, natural gas will be one of those fuels whose importance is likely to increase in future. Because of its properties, natural gas can be used directly in spark-ignition engi...

The focus on seeking alternative fuels for combustion engines has been on the environmental and political scene for many years. Simultaneously there is a more and more serious problem of non-degradable waste utilization. In the present work an attempt has been made to asses both of those aspects by proposing a tailor-made, 3-component mixture consi...

The article presents the results of noise measurements during a control passage recorded in the interior of a bus with a serial hybrid drive. The noise was recorded in a continuous mode, and the course was adjusted for the pressure level and spectrogram in the field of time and frequency.

The limited resources of fossil fuels, as well as the search for a reduction in emissions of carbon dioxide and other toxic compounds to the atmosphere have prompted the search for new, alternative energy sources. One of the potential fuels which may be widely used in the future as a fuel is biogas which can be obtained from various types of raw ma...

For limited period of time article is available free at:https://authors.elsevier.com/c/1VugT3iH40KBE Abstract: In the present paper, laboratory produced, animal origin biofuels (swine lard and turkey lard had been used as raw material for biofuel production) were evaluated in terms of physicochemical parameters and compared with commercial mineral...

The network system of data exchange between the various components is an inherent element of every car. Because of the specific and different requirements for data transfer between specific devices, currently used communication protocols have different properties of performance, security, and degree of determinism. The paper presents the increasing...

Limited fossil fuel supplies and the necessary reduction in toxic fumes emission to the atmosphere are the main motives in conducting a search for the new, effective energy supplies. The one with potential is biogas. It is the product of natural fermentation processes of municipal waste in landfills or is produced in biogas plants out of agricultur...

Increasing demands for the reduction of exhaust emissions and the pursuit to reduce the use of fossil fuels require the search for new fuelling technologies in combustion engines. One of the most promising technologies is the multi-fuel compression ignition engine concept, in which a small dose of liquid fuel injected directly into the cylinder act...

The aim of the study was to determine the possibility of using the unconventional vegetable oils for the biofuel production. The research material were cold-pressed oils from the seeds of milk thistle, hemp and evening primrose. After conducting the initial physicochemical characteristics of oil samples, including the determination of sulphur conte...

In this study, a novel rotary cleaning device was used for the separation and cleaning of wheat grains. This research analyzed the influence of the inclination angle of the sieve drum (K) of the device on the quality of these processes. In this article, the results obtained for four selected rotational speeds (n b ) of the sieve drum are presented....

The problem of alternative fuels for combustion engines has been growing in importance recently. This is connected not only with decreasing fossil fuel resources, but also with the growing concern for the natural environment and the fight against global warming. This paper discusses the possibility of utilizing alternative gaseous fuels in compress...

Increasing the share of renewable electrical energy in the overall energy balance is one of the major challenges of humanity. It is primarily connected with global warming and increasing environmental pollution. One of the ways to counteract this problem is to promote the importance of renewable fuels, including gaseous fuels which are relatively l...

Improving the efficiency or work and reducing the emissions of toxic substances into the atmosphere are the two key directions of development of modern combustion engines. Improvement of engine efficiency is feasible only by increasing the precision of control thereof, which necessitates long-term operating tests. Regrettably, due to complexity of...

Modern combustion engines have developed into technologically advanced units that are controlled by complex electronic systems. The controllers of these systems are equipped with builtin control algorithms which allow the engine to achieve optimum engine performance parameters, in compliance with the strict requirements of standards related to the...

Biogas is among the fuels whose significance in the general energy balance will increase. These results from the fact that it may be produced from various kinds of waste materials, and it is therefore considered a renewable fuel of the second generation. Because of its properties, biogas may be used directly to power spark-ignition engines. Nonethe...

Biodiesel, as a product of the transesterification reaction of fatty material, is gaining appreciation all over the world and confirms its beneficial effect on the reduction of exhaust gases when (even partly) used to power compression-ignition engines. Although many researchers have focused on biofuel production and its application in combustion e...

Seeking alternative sources of energy for its more effective use, reducing emissions of toxic pollutants to the atmosphere and counteracting global warming are nowadays the major areas of development in the power industry, including the design of combustion engines. Currently, the research into the use of new fuels, which may be effective sources o...

Protection of the environment and counteracting global warming require finding alternative sources of energy. One of the methods of generating energy from environmentally friendly sources is increasing the share of gaseous fuels in the total energy balance. The use of these fuels in compression-ignition (CI) engines is difficult due to their relati...

Currently, one of the major trends in the research of contemporary combustion engines involves the potential use of alternative fuels. Considerable attention has been devoted to methane, which is the main component of Natural Gas (NG) and can also be obtained by purification of biogas. In compression-ignition engines fired with methane or Compresse...

The aim of the study was to evaluate the use of camelina and mustard methyl esters and their mixtures with diesel (in 95:5 and 80:20 proportion) as fuels for compression ignition engines. Esters prepared with acid-base transesterification process methyl were characterized in terms of the lipid composition, kinematic viscosity at 40°C, density at 15...

The article describes a concept of a non-invasive method for diagnosing the size of valve clearance in internal combustion engines, based on the analysis of engine surface vibration signals using artificial neural networks. The applicability of the method was tested on a single-cylinder compression-ignition engine with a low power rating, which had...

The problem of using alternative fueling sources for combustion engines has been growing in importance recently. This is connected not only with the dwindling oil resources, but also with the growing concern for the natural environment and the fight against global warming. This paper proposes the concept for a zero-dimensional model of a multi-fuel...

The pursuit of reduced greenhouse gas emissions, as well as the increased share of renewable fuels in the overall energy balance has led to a search for alternative energy sources. One of the fuels on which great hopes are set as fuel for engines is biomethane or biogas, whose main component is methane. Biogas can be obtained from different product...

The need to limit greenhouse gases emissions and to increase the share of renewable fuels in the general energy balance forces people to look for new alternative energy sources. Methane or biogas, in which methane is the main combustible component, is one of such fuels, which is believed to be a promising diesel engine fuel. It is worth emphasizing...

The pursuit of safety improvement and the need to meet ever-stricter toxic compound air emission standards and increase the operational efficiency of automotive vehicles has led to the use of a growing number of electronically-controlled systems. The progressive standardization of solutions for such systems, related both to cutting their manufactur...

This paper presents a comparative analysis of the diesel engine performance and emission characteristics, when operating on diesel fuel and various diesel-biodiesel (B10, B20, B40, B60) blends, at various loads and engine speeds. The experimental tests were performed on a four-stroke, four-cylinder, direct injection, naturally aspirated, 60 kW dies...

The article describes a concept of a non-invasive method for diagnosing the size of the valve clearance of combustion engines based on an analysis of engine surface vibration signal using artificial neural networks. The applicability of the method was tested on a single-cylinder compression-ignition engine with a low power rating, which had an OHV...

One of the ways of increasing the share of renewable fuels in the overall energy balance is to develop effective methods for using low calorific gaseous fuels, including biogas, to fuel combustion engines. This paper presents the results of research on the effect of changing the diesel fuel pilot charge injection advance angle on the operating para...

The use of liquid fuels as an energy source for internal combustion engines is unavoidable nowadays, further consumption increases with the development of industry and economic growth of the country. The abundance of the world in fossil fuels is a highly controversial issue, however, irrespective of forecasts concerning deposits of mineral fuels, u...

Reduction of greenhouse gases emissions into the atmosphere, as well as increasing the share of renewables in the overall energy balance, forces the search for new, alternative energy sources. One of the fuels which presents high potential for combustion engines are biomethane or biogas, with methane as the main flammable component. Biogas can be o...

The electromagnetic injector in the Common Rail system is the actuator directly responsible for fuel injection. Its proper operation is enabled by ensuring appropriately shaped changes of the electric signal worked out by the output stage of the controller. This paper determines the repeatability of the control signal and the possibility of using t...

Electrical energy production from renewable energy sources is currently one of the key directions of conducted research. This paper describes a developed laboratory control system for the operation of a dual-fuel compression ignition engine in which the main fuel charge is fed in the form of biogas with variable composition, it also describes a sys...

The experiments described in the article aimed at adjusting the engine test bed, its equipment and software to perform comprehensive tests on a dual-fuel spontaneous combustion engine with the main gas dose (methane or biogas) and a liquid fuel ignition dose. The steps undertook during the tests included installing a new engine on the engine test b...

This paper presents a method of production and properties of ethyl esters as well as the differences between them and methyl esters. It discusses the technology of esterification and the benefits brought by the use of rapeseed ethyl esters as renewable fuel. It also presents elements of structure, actuators and control mechanisms of a mobile biodie...

It discusses different construction solutions of dual – fuel engines. It shows influence parameters decisive about combustion different fuels in dual- fuel engine. It says about the way to adaptation 1.9 TDI engine to feeding with liquid piloting dose (ethyl ester of higher Fatty Acid) and indirect injection dose of methane. It discus specific stee...

It discuss different construction solutions of dual – fuel engines. It shows influence parameters decisive about combustion different fuels in dual- fuel engine. It says about the way to adaptation 1.9 TDI engine to feedeng with liquid dose piloting (ethyl ester of higher Fatty Acid) and indirect injection dose of methan. It disscus specific steer...

Vehicles are quite complex technical objects and complicated wear processes accompany their exploitation. The intensity of degradation of particular systems of a vehicle depends not only on a construction but also on the exploitation conditions.In the following paper the mechanisms and conditions influencing degradation of vehicles have been presen...

The paper presents the effect of the main parameters of pilot dose ignition: injection pressure, injection advance angle and injector opening time on the combustion process in a dual fuel diesel engine. The study continues the research conducted at the Department of Mechatronics of the University of Warmia and Mazury, Olsztyn, on optimisation of du...