Navigation instrument
US4371940A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1981 |
| Grant date | Feb 1, 1983 |
| Priority date | — |
| Expiry date | Jul 30, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A navigation instrument for use with a roadway vehicle comprises an arithmetic means producing three data signals showing the average speed of the vehicle, the deviation of the travelling distance from a scheduled one, and the deviation of the travelling time from a scheduled one, and a display means for displaying the three data sequentially fed from the arithmetic means through a signal selector means. The arithmetic means includes travelling distance/time deviation accumulating means for adding the deviation of the travelling distance/time with respect to the average speed initially set to the deviations of the travelling distance/time whenever the average speed is altered. Thus, the navigation instrument of the present invention makes it possible to calculate and display the travelling distance/time deviation accumulated value when the average speed of the vehicle is altered on the way of vehicle travelling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.