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The results of investigations focusing on knock combustion analysis of a hydrogen-fueled engine have been presentedin the paper. Knock intensity was determined as the intensity of the in-cylinder combustion pressure pulsations (recordedwith a sampling frequency of 100 kHz) and filtered through high-pass filtering with cut-off frequency of 3.5 kHz.The research was conducted on the CFR engine with a variable compression ratio ranging from 6 to 14. The researchhas shown a rapid increase in pressure pulsations amplitude was observed while the compression ratio was changedfrom 11 to 12. This was interpreted as a result of in-cylinder hydrogen-air mixture self-ignition at the end of the sparkignition controlled combustion. Supporting this observation the theorem of dual nature of hydrogen knock combustionwas postulated. Intensity of the pressure pulsations that accompany normal combustion without hydrogen self-ignitionwas in an exponential correlation with the compression ratio, which directly translates into a similar correlation of thepulsations and temperature of hydrogen-air mixture at the moment of ignition.

Hydrogen resistance to knock combustion in spark ignition internal combustion engines