Navigation system of a vehicle
US5760713A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 3, 1997 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Mar 3, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/3407
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To make it possible to search a route suitable to drive and provide guidance thereof in accordance with acceleration resistance of the vehicle, a load condition detection unit obtains reference acceleration on the basis of a throttle opening obtained by a throttle opening obtaining unit and torque of an engine obtainable from a rotational frequency of the engine detected by a first rotation sensor. The load condition detection unit compares the reference acceleration with real acceleration obtainable by differentiating a vehicle velocity obtainable by a vehicle velocity sensor to detect acceleration resistance of the vehicle. A main controller unit extracts an available road on the basis of the acceleration resistance of the vehicle and road data stored in a road data memory unit of a map data memory unit. The main controller unit searches a route by utilizing the available road thus extracted and provide guidance thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.