Driver's arousal level estimating apparatus for vehicle and method of estimating arousal level
US6686845B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 2001 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Jan 2, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60W2520/125
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A driver's arousal level estimating apparatus for a vehicle includes a Fast Fourier Transformation (FFT) signal processing section for obtaining respective frequency component powers by applying a frequency conversion to displacement quantities successively detected of the vehicle, an evaluation value calculating section 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 for judging a driver's arousal level based on the evaluation value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.