Combustion Process in a Spark Ignition Engine: Dynamics and Noise Level Estimation

摘要

We analyse the experimental time series of internal pressure in a fourcylinder spark ignition engine. In our experiment, performed for differentspark advance angles, apart from usual cyclic changes of engine pressure weobserved oscillations. These oscillations are with longer time scales rangingfrom one to several hundred engine cycles depending on engine workingconditions. Basing on the pressure time dependence we have calculated the heatreleased per cycle. Using the time series of heat release to calculate thecorrelation coarse-grained entropy we estimated the noise level for internalcombustion process. Our results show that for a smaller spark advance angle thesystem is more deterministic.