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US 6,154,152 AGranted
Road data maintenance system and on-vehicle terminal apparatus compatible therewith
AssigneeToyota Jidosha Kabushiki Kaisha
InventorToru Ito
Life of this patent
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AssigneeToyota Jidosha Kabushiki Kaisha
InventorToru Ito
Estimating the term…
Unpossessed road data is added to possessed road data stored in a road contour database of an information center. An on-vehicle terminal apparatus first compares a current position of a vehicle detected by a D-GPS unit against the road data stored in a storage section for storing road contour data of possessed roads. If the current position deviates from a known existing road, it is determined that the vehicle travels on an unpossessed road. Road data of the unpossessed road is then obtained based on a travel locus of the vehicle and sent to the information center together with a reliability index of the road data. The information center collects unpossessed road data from a plurality of sources, evaluates the reliability index for each data, and adds sufficiently reliable road data to the possessed road data. Thus, the information center can quickly obtain and utilize new and reliable road data.
A road data maintenance system for maintaining possessed road data possessed by an information center by adding unpossessed road data which is not possessed by said information center to said possessed road data,
An on-vehicle terminal apparatus mounted on a vehicle and connected via communication means to an information center to which said on-vehicle terminal apparatus provides information for maintaining possessed road data which is possessed by said information center, comprising:
Dependencies are inferred from the claim text.