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1

Engine flexibility for SI engines fueled by liquid gas with dimethyl ether blend

Fabiś Paweł

Transport Problems

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2023

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T. 18, z. 2

5--16

EN

The aim of the study is to present the changes in the vehicle dynamics that occur in connection with the use of various fuels that power the engine. The article presents the effect of gaseous fuels being mixtures of LPG and BioDME on the flexibility of the vehicle. In previous studies, not much attention has been paid to the problem of changing the performance of the vehicle with the use of various fuels supplying the engine. It is a new approach that allows to determine the advantages and disadvantages of using alternative fuels, including mixtures using BioDME. The study was conducted for a four-cylinder SI engine with a displacement of 1.6 dm3, installed in a passenger vehicle. The mixture of LPG and DME was assessed, and the results compared to the parameters obtained for the LPG-powered engine. Received results have been made it possible to determine changes in the value of the engine flexibility for selected engine loads and various DME shares in the mixture. The thesis that DME can be considered as an activator of the combustion process and may have an impact on the vehicle dynamics is confirmed.

2

Elastyczność wybranych silników samochodów elektrycznych

Gołębiewski W.

Autobusy : technika, eksploatacja, systemy transportowe

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2017

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R. 18, nr 7-8

78--81

PL

W artykule przedstawiono elastyczność wybranych silników samochodów elektrycznych. Do obiektów badań należały pojazdy, wiodących producentów światowych, wyposażone w napęd elektryczny. Badaniom poddano wytwarzane seryjnie modele samochodów koncernów Honda, Mercedes, Mitsubishi, Nissan, Renault, Tesla i Volkswagen. Na podstawie obliczeń stwierdzono, że najbardziej elastyczną jednostką napędową jest silnik elektryczny pojazdu volkswagen e-up, najmniej natomiast silnik tesla s.

EN

The article presents flexibility of motors of electric cars. Test objects were world's leading manufacturers vehicles equipped with electric drive. The tests were conducted in series car models companies of Honda, Mercedes, Mitsubishi, Nissan, Renault, Volkswagen and Tesla. On the basis of calculations, it was found that the most flexible drive unit is an electric motor vehicle vw e-up, at least while the engine tesla s.

3

Analytical determination of the characteristics of engine power Fiat 1.3 JTD

Prajwowski K., Gołębiewski W.

Journal of KONES

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2014

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Vol. 21, No. 2

267--272

EN

Combustion engines are commonly used in car propulsion systems. They belong to a group of heat engines, i.e. those that convert the heat obtained from combustion of liquid or gaseous fuels into mechanical work. Engine parameters, such as power output (Pd ), torque (Ttq) and adaptability to variable traffic [motion] conditions, represent vehicle motion and its functional properties. The torque (Ttq) and the crankshaft speed (n) are measured directly with the use of dynamometer at specific measurement conditions but the power (Pd ) is determined indirectly. The relationships between these parameters are presented using external characteristics. They allow determination of engine adaptability to changes in the resistance to motion, i.e. its flexibility (E). In the paper, flexibility and analytical determination of the power and torque curves through application of Leidemann’s formulas are discussed. Results of the research conducted with the use of turbocharged compressionignition engine equipped with Common Rail fuel system are presented. The correlation between the power and torque curves based on Leidemann’s formulas and the real curves obtained on the basis of experimental research (with application of engine dynamometer) are verified. Finally, evaluation of the method applied for determining the power curves by the speed range of FIAT 1.3 JTD engine was made.

4

The impact of air filter on operational properties of engine with the common rail fuel supply system

Gołębiewski W.

Journal of KONES

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2013

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Vol. 20, No. 1

103--109

EN

The objective of this research project was to determine the percentage impact of dry-medium air filter being used in Fiat Multijet 1.3 JTD engine on its operational properties (engine flexibility and specific fuel consumption). Experiments were performed according to the requirements of research methods specified in the piston combustion engine standard in force. In order to make comparisons, operational parameters of the power unit (torque, effective power and specific fuel consumption) were measured with dry-medium air filter (with a new filter element) being fitted and with air filter being removed. Each point of respective characteristic curves was determined based on four measurements as their mean value. Also boost pressure, which could be of importance for results, was considered in the experiments. However, the degree of EGR valve lift, the operation of which could also appear to be important, was not taken into account. For each measuring point of respective characteristic curves, the ranges of measurement uncertainties were determined. Expanded standard uncertainties were calculated based on the Guide to the Expression of Uncertainty in Measurement. The experiments being carried out allowed concluding that the engine with air filter was less flexible by approx. 20% when compared to that without air filter, whereas its specific fuel consumption was greater by approx. 9%. The degree of air filter pollution affects its flow resistance and, which is related to this, engine torque and its effective power as well as its flexibility decrease but fuel consumption increases