Navigation Device and Navigation Method
First Claim
1. A navigation device for searching a destination and guiding a vehicle to the destination, the navigation device comprising:
- a road map data storage unit storing road map data including altitude information;
an energy variation calculation unit for calculating variation of energy of the vehicle travelling on a road link included in the road map data; and
a route-search unit for searching a fuel-efficient route for the vehicle based on the variation of energy calculated by the energy variation calculation unit.
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Accused Products
Abstract
A central device uses a link shape compression unit 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 estimates the vehicle'"'"'s average travelling pattern by using a travel-pattern-estimation unit based on the geometry parameter calculated by the central device, a link-travelling time estimated from statistically-stored traffic information, and a link length. The on-board terminal device 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, and then, searches a fuel-efficient route by using the fuel consumption as a link cost. The on-board terminal device has a vehicle-type selector for selecting a type of the vehicle. The present invention can reduce data size of information processed by the on-board terminal device, and facilitate application of a fuel-efficient route search to various types of vehicles.
56 Citations
12 Claims
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1. A navigation device for searching a destination and guiding a vehicle to the destination, the navigation device comprising:
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a road map data storage unit storing road map data including altitude information; an energy variation calculation unit for calculating variation of energy of the vehicle travelling on a road link included in the road map data; and a route-search unit for searching a fuel-efficient route for the vehicle based on the variation of energy calculated by the energy variation calculation unit. - View Dependent Claims (2, 3, 4)
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5. A navigation method using a navigation device having a road map data storage unit having road map data including altitude information, the navigation method comprising the steps, carried out by the navigation device for searching a route and guiding a vehicle to a destination, of:
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calculating variation of energy of the vehicle travelling on a road link included in the road map data; and searching a fuel-efficient route for the vehicle based on the calculated variation of energy. - View Dependent Claims (6, 7, 8)
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9. A navigation device comprising:
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a road map data storage unit storing road map data therein; a geometry parameter storage unit for storing data of variations of energy calculated previously for road links included in the road map data by using altitude information, the data of variations of energy being stored as geometry parameters; an energy variation calculation unit for calculating the variation of energy of the vehicle travelling on each road link included in the road map data based on the data of variation of energy according to each travel pattern of the vehicle; and a route-search unit for searching a fuel-efficient route for the vehicle based on the variation of energy calculated by the energy variation calculation unit. - View Dependent Claims (10, 11, 12)
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Specification