| 摘要 |
A central device (1) uses a link shape compression unit (111) to compress information of shape of ups and downs of a road link obtained from a three-dimensional road map, and calculates a geometry parameter based on variation of energy of a vehicle travelling on the road link. An on-board terminal device (2) estimates the vehicle's average travelling pattern by using a travel-pattern-estimation unit (2151) based on the geometry parameter calculated by the central device (1), a link-travelling time estimated from statistically-stored traffic information, and a link length. The on-board terminal device (2) further calculates fuel consumption of the vehicle travelling on each road link based on the estimated travelling pattern and parameters of the vehicle by using a fuel-consumption calculation unit (2152), and then, searches a fuel-efficient route by using the fuel consumption as a link cost. The on-board terminal device (2) has a vehicle-type selector (214) for selecting a type of the vehicle. The present invention can reduce data size of information processed by the on-board terminal device (2), and facilitate application of a fuel-efficient route search to various types of vehicles.
|
