We report our results on non-periodic experimental time series of pressure in a spark ignition engine. The experiments were performed for a low rotational velocity of a crankshaft and a relatively large spark advance angle. We show that the combustion process has many chaotic features. Surprisingly, the reconstructed attractor has a characteristic butterfly shape similar to a chaotic attractor of Lorentz type. The suitable recurrence plot shows that the dynamics of the combustion is a nonlinear multidimensional process mediated by stochastic noise.
@article{arxiv.nlin/0302046,
title = {Nonperiodic Oscillations of Pressure in a Spark Ignition Engine},
author = {M. Wendeker and G. Litak and J. Czarnigowski and K. Szabelski},
journal= {arXiv preprint arXiv:nlin/0302046},
year = {2015}
}