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The fluctuations in the combustion process of diesel fuel with hydrogen addition in an internal compression ignition engine were investigated. The cyclic combustion pressure was measured and its cyclic oscillations were expressed by indicated mean effective pressure per cycle. The statistical and multifractal analyses applied to the corresponding time series showed considerable changes in the engine dynamics for hydrogen percentages ranging from 5% to 20%. The study for the diesel engine was carried out for 11 various operating points and at the speeds ranging from 1200 to 2000 rpm. Also, exhaust gas components were analyzed. The hydrogen addition was found to affect the differentiation of the indicated mean effective pressure in the engine. A reduction of CO₂ emissions and an increase in NOx emissions were registered.

The paper presents the simulation of engine model that was made in AVL Boost Software. The model assumption was the indirect additive supplying hydrogen to the SI engine. The simulation test model of a spark ignition engine, have been developed in the AVL Boost software. The model is based on a real four-cylinder engine, codenamed A14XER that meets the Euro 5 emission standard. This engine is used in passenger vehicles Opel Corsa. In order to most accurate reflection of real engine, the model was developed based on data provided by the engine manufacturer. In the simulation studies two-zone combustion model Vibe (Vibe 2 zone) was used. A General Species Transportation model was also defined, which allowed to use the fuel as a blend of gasoline and hydrogen to supply the engine. Calculations were performed for a full load for different values of rotational speed of the engine crankshaft (from 1000 rpm to 6400 rpm).