Driver's arousal level estimating apparatus for vehicle and method of estimating arousal level

摘要

A driver's arousal level estimating apparatus for a vehicle includes a FFT signal processing section (3) for obtaining respective frequency component powers by applying a frequency conversion to displacement quantities successively detected of the vehicle, an evaluation value calculating section (4) for calculating an evaluation value from a ratio of an average value of the respective calculated frequency powers and a maximum value of frequency component powers in a specified frequency domain containing a predetermined lateral fluctuation frequency characteristic of a lowered arousal level, and a judging section (5) for judging a driver's arousal level based on said evaluation value.