Warning device for a vehicle
US4565997A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1982 |
| Grant date | Jan 21, 1986 |
| Priority date | — |
| Expiry date | May 6, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B21/06
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A warning device for a vehicle comprises a steering angle detector 10 producing steering angle pulses S.sub.2, S.sub.3 indicative of the steering angle and the steering direction whenever the variation of the steering angular position exceeds a predetermined angle, a dozing detecting circuit 16 which distinguishes that the driver is in normal condition when excessively frequent steering operations in one direction are performed and distinguishes that the driver is dozing to produce a warning signal when steering operations, each of which does not exceed the predetermined angle in one direction, are repeated at a rate greater than a predetermined frequency, and a warning means 26 for producing visible or audible warning in response to the warning signal, whereby, the warning device can accurately detect dozing of the driver and produce a warning to make the driver wake up.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.