Analyse des Verbrennungsablaufes im Ottomotor

The analysis of the combustion process in spark ignition engines is important because their operation accounts for about 20% of the total oil consumption. A gain in efficiency will be beneficial for both energy consumption and exhaust emissions. Combustion in an engine differs in several points from ideal combustion process. Detailed information is given in the paper by considering three consecutive parts of combustion: the inflammation period, the main burning period, the afterburning period. In spark ignition engines practically only the inflammation period depends on the equivalence ratio. Quantitative details of the combustion process and of flame spread is obtained by pressure measurements, ionisation gaps and local radiation measurements.