Effects of changes of injection timing on selected parameters of combustion process in a diesel engine fuelled with fuels of different properties

International Automotive Conference 2018

Sroka, Z.J.^1 ; Heda, R.^1 ; Romanowicz, M.^1

Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, Wroclaw

50-370, Poland^1

关键词: Chemical tests;    Combustion pro-cess;    Excess air ratios;    Fuel conversion efficiencies;    Injection timing;    Laboratory test;    Research and development;    Thermodynamic cycle;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/421/4/042075/pdf
DOI  :  10.1088/1757-899X/421/4/042075

来源: IOP

【 摘 要 】

The internal combustion engine is and for many years will be the very important source of drive for many machines and vehicles. That's why research and development centres are still researching to improve the design of it. The dominant feature among these studies is the evaluation of combustion process, which can be shaped according to different rules and various parameters. Through this article, the Authors join the discussion on the assessment of changes in selected parameters of combustion process caused by changes in injection timing of different fuels. The considerations were narrowed down to self-ignition engines with their representative VW 1.9TDI PD, which was subjected to laboratory tests. When making changes in injection timing, the following parameters were evaluated: excess air ratio, pressure in combustion chamber, heat of fuel dose and the related work of a single thermodynamic cycle. The first part of the article specifies the requirements for fuels and shaping the fuel stream in order to obtain the highest efficiency. The practical part contains the results of chemical tests of two fuels with different properties and laboratory tests that allowed to carry out cycle indicators for the selected load of tested engine. By identifying factors of injection timing, it was possible to determine the most favourable values of useful work of a single cycle, in relation to heat of fuel dose expressed in the values of fuel conversion efficiency.