Patent ID: 6470263
Filing Date: 2002-10-22
Classification: G01C

Abstract:
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 and a previous average vehicle speed.