Drowsiness alarm system for a vehicle
US4463347A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1981 |
| Grant date | Jul 31, 1984 |
| Priority date | — |
| Expiry date | Sep 21, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60W2540/18
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A drowsiness alarm system for a vehicle which gives an alarm to the vehicle driver when detecting a vehicle steering condition such as to indicate a state of drowsiness, thus preventing driving in an increasing state of drowsiness. The drowsiness alarm system, according to the present invention, comprises: (a) a steering angle detection circuit which outputs a first pulse whenever the vehicle driver turns the steering wheel in either of the clockwise and anticlockwise directions in excess of a predetermined angle; (b) a quick steering detection circuit which outputs a second pulse whenever the number of the first pulses reaches a predetermined number within a predetermined period of time; and (c) an alarm unit which gives an alarm in a predetermined form to the vehicle driver in response to the second pulse fed from the quick steering detection circuit. Furthermore, to ensure more accurate detection of the state of drowsiness, there may be provided in the drowsiness alarm system a frequency of steering detection circuit which outputs a third pulse when detecting an increasing frequency of steering changes, a vehicle speed sensor for inhibiting the alarming when the vehicle speed is…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.