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In certain applications, the use of natural gas can be beneficial when compared to conventional road transportation fuels. Benefits include fuel diversification and CO₂ reduction, allowing future emissions regulations to be met. The use of natural gas in vehicles will also help to prepare the fuel and service infrastructure for future transition to gaseous renewable fuels. The composition of natural gas varies depending on its source, and engine manufacturers must be able to account for these differences. In order to achieve highly fuel flexible engines, the influence of fuel composition on engine properties must first be assessed. This demand is especially important for engines with high power densities. This paper summarizes knowledge acquired from engine dynamometer tests for different compositions of natural gas. Various levels of hydrocarbons and hydrogen in a mixture with methane have been tested at full load and various engine speeds.

This paper deals with the influence of CO, CO₂, N₂, H₂, C₂H₆, C₃H₈ and C₄H₁₀ content in fuel on basic engine integral parameters. The focus is on the influence of biogas fuel composition on engine thermodynamic features. The paper describes the iterative regression method evaluating the influence of individual gas mass fraction and engine operation parameters on cumulative heat release curve of SI engines. The parameters for recalculation of heat release patterns depending on individual gas mass fraction in fuel and operation parameters are derived. The modeled cumulative heat release patterns are converted into burned fuel fraction pattern. The particular outputs are generalized using GT-POWER-based model results.