Engines using HCCI technology are potentially significantly more efficient compared to classic spark-ignition engines. Improved thermal efficiency is the result of several factors such as elimination of gas throttling losses, shorter burning time, higher compression ratios and lower heat transfer losses. The upper limit of the compression ratio is the occurrence of detonations. As part of the development of lean combustion, there are several technologies that are being developed to achieve long-term reliability. The solution is to create fuel-rich zones inside the chamber, e.g., using fuel stratification. Therefore, a "Combustion chamber with the implementation of homogenization and controlled self-ignition of the fuel mixture using compression" was designed, for which a patent was granted. The design was based on the assumption that a stratified charge engine creates a richer fuel mixture near the spark and a leaner mixture throughout the rest of the combustion chamber. The patent system was subjected to a simulation analysis, which confirmed a significant yield for emission reduction.
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