Average vehicle speed calculation device
First Claim
1. An average vehicle speed calculation device comprising:
- a position detector for detecting a position of a vehicle;
a road type determination unit for determining a type of road the vehicle is traveling based on the position detected by the position detector;
a travel distance calculation unit for calculating a travel distance of the vehicle based on a change in the position detected by the position detector;
an instant vehicle speed calculation unit for calculating, when the travel distance calculate by the travel distance calculation unit reaches a predetermined determination reference under a condition that the road type determined by the road type determination unit is the same, an instant vehicle speed of the vehicle for each road type based on the predetermined determination reference and time required to travel the predetermined determination reference; and
an average vehicle speed calculation unit for calculating an average vehicle speed for each road type by using the instant vehicle speed calculated by the instant vehicle speed calculation unit.
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Accused Products
Abstract
In a navigation system for vehicles, a type of road a vehicle travels is determined based on a present position of a vehicle and road data, and a change in the type of road is determined. The road type is determined based on the type of link the vehicle travels referring to a table storing a relation between a link type and a road type. A travel distance is accumulated until the travel distance exceeds a predetermined determination reference, when the road type remains unchanged. An instant vehicle speed is calculated each time the vehicle travels the determination reference. An average vehicle speed is calculated by using the instant vehicle speed calculated for each road type. The average vehicle speed is used to notify an estimated time of arrival at a destination or a passing point.
13 Citations
10 Claims
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1. An average vehicle speed calculation device comprising:
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a position detector for detecting a position of a vehicle;
a road type determination unit for determining a type of road the vehicle is traveling based on the position detected by the position detector;
a travel distance calculation unit for calculating a travel distance of the vehicle based on a change in the position detected by the position detector;
an instant vehicle speed calculation unit for calculating, when the travel distance calculate by the travel distance calculation unit reaches a predetermined determination reference under a condition that the road type determined by the road type determination unit is the same, an instant vehicle speed of the vehicle for each road type based on the predetermined determination reference and time required to travel the predetermined determination reference; and
an average vehicle speed calculation unit for calculating an average vehicle speed for each road type by using the instant vehicle speed calculated by the instant vehicle speed calculation unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification