Navigation apparatus for vehicle
US5130709A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 16, 1991 |
| Grant date | Jul 14, 1992 |
| Priority date | — |
| Expiry date | Apr 16, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A navigation apparatus for a vehicle according to the present invention is designed to compare the distance from the previous intersection or feature to a further feature with the value from an odometer (2) and then to forcibly zero the remaining distance to the further feature when the difference between the distance and the value of the odometer becomes equal to or smaller than a predetermined value and when the feature is detected by a radar (12) or a road surface sensor (13). In consequence, even if the vehicle has to travel a long distance before it reaches an intersection where it makes a turn, a correct travelled distance can be obtained by correcting the distance detection errors as each feature is detected, thereby enabling a correct present position to be detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.