Patent ID: 6216118
Filing Date: 2001-04-10
Classification: F16H,G06F,G06K

Abstract:
An apparatus for discriminating a time series data observed from a dynamical system comprising a vehicular automatic transmission, the apparatus comprising:a detector for observing a shaft vibration sound of the automatic transmission;a converter for converting the shaft vibration sound into a digital signal;a processor for providing the time series data according to the converted digital signal;means for embedding the time series data y(t) in an n-dimensional state space;means for selecting an arbitrary data vectors Xi from trajectories of the embedded time series data;means for selecting, in terms of Euclidian distance, m data vectors Xj (j=1, 2, - - - , m) neighboring to the selected data vector Xi;means for deriving tangential unit vectors Ti and Tj with respect to the data vectors Xi and Xj;means for calculating variations in directions relative to the tangential unit vectors Tj of the neighboring data vectors by referring to the tangential unit vectors Ti as follows: ##EQU9##means for iterating the calculation of .gamma.i at the calculating means for a predetermined sample number k which corresponds to subspaces to derive a mean value .GAMMA.: ##EQU10##means for determining whether .GAMMA.=0; andmeans for discriminating whether the observed time series data is deterministic chaos or a stochastic process according to a result of the determination of the mean value .GAMMA..