Zero-dimensional thermodynamic model for internal combustion engine

U ovom radu opisan je nulto-dimenzionalni model motora s unutarnjim izgaranjem, prednabijanjem i hlađenjem stlačenog zraka za izgaranje. Ukratko su objašnjeni teorijski principi rada te prednosti i nedostaci pojedinih klasa modela. Dan je opis matematičkog modela svakog od glavnih dijelova motora koji su međusobno povezani u jednu cjelinu koja čini matematički model cijelog motora. Model motora se izradio po uzoru na moderni šesterocilindrični dizelski motor s prednabijanjem i hlađenjem stlačenog zraka N57D30O0 njemačkog proizvođača vozila BMW. Dan je sažeti tehnički opis glavnih dijelova i sustava navedenog motora uz navedene glavne tehničke karakteristike motora. Za provedbu simulacija rada motora korišten je računalni program Engine Simulation britanske tvrtke Lotus Engineering. Usporedbom rezultata simulacije rada motora s vrijednostima snage i okretnog momenta stvarnog motora zaključilo se da je napravljeni model motora valjan te da vjerno opisuje rad stvarnog motora uz mala odstupanja vrijednosti dobivenih simulacijom od stvarnih vrijednosti motora. Analizirao se utjecaj tlaka prednabijanja na rad motora i turbopuhala te utjecaj temperature vanjskog zraka u okolini motora na njegov rad te na rad hladnjaka stlačenog zraka. Također su se usporedili rezultati simulacije rada motora sa i bez hladnjaka stlačenog zraka.This master’s thesis describes the workings of a zero-dimensional thermodynamic model of a diesel powered, turbocharged internal combustion engine with charge air cooling. Theoretical working principles of various mathematical model types (regarding their dimensionality) are briefly described, as are their respective advantages and disadvantages. Mathematical models of each of the main individual engine components are described. When combined, those individual models make up the model of the whole engine. The virtual engine model was modelled after a modern six-cylinder turbocharged engine with charge air cooling, the BMW N57D30O0 engine. A brief technical description of the main parts and systems of the aforementioned engine is given, as are its main technical parameters. Engine Simulation, a computer program made by Lotus Engineering, was used to carry out the engine run simulations. By comparing the results of the engine run simulations with the power and torque values of the real engine it is concluded that the engine model created is valid and that it correctly describes the operation of the real engine with small deviations between the values obtained by the simulation and the actual engine values. The influence of varying boost pressure on the engine and turbocharger operation was analysed, as well as the influence of the outside air temperature on its operation and the operation of the charge air cooler. The simulated results of the engine running with and without a charge air cooler were also compared