Dozing warning system for a vehicle
US4564833A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1982 |
| Grant date | Jan 14, 1986 |
| Priority date | — |
| Expiry date | Sep 22, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60W2540/18
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A warning device for a vehicle includes 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) distinguishes that the driver is in a normal condition when excessively frequent steering operations in one direction are performed or when the interval of the steering angle pulse is longer than a predetermined value, and produces 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. A warning device (26) produces a 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.