| Abstract [eng] |
The main aim of the thesis is to investigate the influence of operational accessories on the diesel internal combustion engine parameters. To following tasks were performed to achieve the aim: diesel internal combustion engine performance additives were examined, future research methodology was prepared, operational diesel internal combustion engine accessories were used, the results obtained by the use of additives before and after use were compared. For the tests a car Nissan Primera (P11) with 1,974 cm3 displacement, 4-cylinder, SDI turbocharged engine was selected. Oil and fuel additives were used to perform practical research, which showed their influence on engine parameters. First of all, the literature analysis was performed, the common faults and their causes - the fuel system contamination, the grime were analyzed. Fuel and in particular diesel fuel additives and components were overviewed. Diesel defining quality indicators were learned. Emission standards and automotive engine Euro standards compliance by country of origin and year of manufacture were familiarized. Work performance methodology was designed according to analogue researches. Performance additives were chosen. The research consisted of three phases. On the first stage the values of the parameters were measured by which operational additive on diesel internal combustion engine is evaluated. On the second stage, the engine oil was changed and oil supplement was added. Having driven 15 thousand kilometers, the oil was changed again and parameters change was measured. On the third stage, the car tank was filled full with fuel and additive that cleans the fuel system was poured. When the mixture of fuel and additive was driven out, the observable parameters change was measured. Exhaust gas analyzer, smoke meter, optical opacimeter, compressimeter, diagnostic stand and audio meter were used for change observation. In summary it is possible to state that better results have been shown by fuel system cleaner, which increased and leveled compression. Also, in all tests the optical transparency of the gases decreased almost 6 times and the absorption coefficient of the exhaust gases decreased 3 times. No more significant changes of engine sound were noticed. The research is special in comparison to other thesis because the tests had been performed with a car, which lifespan is similar to car lifespan operating in Lithuania, the tests lasted for about a year during which more than 16 thousand kilometers were traveled. Also, instead of testing power with a power stand, a compression change was measured. |
