Navigation instrument for roadway vehicles
US4216530A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1978 |
| Grant date | Aug 5, 1980 |
| Priority date | — |
| Expiry date | Dec 28, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A navigation instrument for roadway vehicles comprises a first counter for counting pulses each occurring in response to the vehicle moving a predetermined distance to detect the distance travelled from the starting point of a trip, a second counter for counting clock pulses to detect the time elapsed from the start of the vehicle. A microcomputer or digital circuitry is provided to compute on the data received from the first and second counters to derive an output data representative of the average speed of the vehicle over the distance so far travelled and to compare the computed average speed with a desired speed to detect the deviation of the actual average speed from the reference. A comparator is provided to detect when this deviation exceeds a predetermined value to generate a warning signal to alert the vehicle driver to correct the vehicle speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.