Vehicle driver alertness apparatus monitoring steering wheel oscillations
US4017843A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1976 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Feb 5, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60W2540/18
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Steering wheel oscillations are detected and a first signal generated for each predetermined number of oscillations. A ramp generator is reset by each first signal and, if its output reaches a preset value, a comparator generates a second signal to indicate excessive time between first signals. An up-down counter is counted up by each first signal and down by each second signal. A comparator compares the contents of the counter with a present number and generates a third signal when the number in the counter falls below the present number. A timer consisting of an integrator and comparator generates a forth signal when the third signal has been present for a predetermined time. The forth signal causes an alarm device to alert the driver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.