In this study, a new method for detecting the quasi periodic behavior is introduced and evaIuated on a feature of the phenomenon of cyclic variations in internal combustion engines. The investigated time series are due to succeeding Top Dead Centers (TDC) intervals at three different engine speeds. Computing the auto - mutual information function using the Fraser-Swinney aIgorithm and maximaI Lyapunov exponent using Kantz algorithm, the TDC dynamics is compared to the quasi periodic route to chaos which we expect from a sine circle map.
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