ROUTE SEARCHING DEVICE
First Claim
1. A route searching device that searches a vehicle running route, the route searching device comprising:
- an estimated fuel consumption amount computing unit that computes an estimated fuel consumption amount of each interval constituting a plurality of routes from a departure point to a destination, andan optimum route selecting unit that selects a route in which a total of the estimated fuel consumption amount from the departure point to the destination is minimized,wherein the estimated fuel consumption amount computing unit includes;
a cruise fuel consumption amount computing unit that computes the cruise fuel consumption amount for each interval by multiplying a distance of the interval and a fuel consumption rate determined according to an average vehicle speed,a vehicle-speed fluctuation fuel consumption amount computing unit that computes the vehicle-speed fluctuation fuel consumption amount for each interval in each road category by multiplying the distance of the interval and a fuel consumption rate, the fuel consumption rate being determined from an average vehicle speed and the road category of the interval, anda gradient fuel consumption amount computing unit that computes the gradient fuel consumption amount for each interval by multiplying the distance of the interval and a fuel consumption rate determined according to a road average gradient,wherein the estimated fuel consumption amount is obtained by adding the cruise fuel consumption amount, the gradient fuel consumption amount, and the vehicle-speed fluctuation fuel consumption amount.
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Abstract
A route searching device according to an embodiment of the invention includes an estimated fuel consumption amount computing unit that computes an estimated fuel consumption amount of each interval constituting plural routes from a departure point to a destination and an optimum route selecting unit that selects a route in which a total of the estimated fuel consumption amount from the departure point to the destination is minimized. The estimated fuel consumption amount computing unit includes a cruise fuel consumption amount computing unit that computes a cruise fuel consumption amount for each interval by multiplying a distance of the interval and a fuel consumption rate determined according to an average vehicle speed a vehicle-speed fluctuation fuel consumption amount computing unit that computes a vehicle-speed fluctuation fuel consumption amount for each interval in each road category by multiplying the distance of the interval and the a fuel consumption rate, the fuel consumption rate being determined from an average vehicle speed and the road category of the interval and a gradient fuel consumption amount computing unit that computes a gradient fuel consumption amount for each interval by multiplying the distance of the interval and a fuel consumption rate determined according to a road average gradient. The estimated fuel consumption amount is obtained by adding the cruise fuel consumption amount, the gradient fuel consumption amount, and the vehicle-speed fluctuation fuel consumption amount.
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Citations
6 Claims
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1. A route searching device that searches a vehicle running route, the route searching device comprising:
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an estimated fuel consumption amount computing unit that computes an estimated fuel consumption amount of each interval constituting a plurality of routes from a departure point to a destination, and an optimum route selecting unit that selects a route in which a total of the estimated fuel consumption amount from the departure point to the destination is minimized, wherein the estimated fuel consumption amount computing unit includes; a cruise fuel consumption amount computing unit that computes the cruise fuel consumption amount for each interval by multiplying a distance of the interval and a fuel consumption rate determined according to an average vehicle speed, a vehicle-speed fluctuation fuel consumption amount computing unit that computes the vehicle-speed fluctuation fuel consumption amount for each interval in each road category by multiplying the distance of the interval and a fuel consumption rate, the fuel consumption rate being determined from an average vehicle speed and the road category of the interval, and a gradient fuel consumption amount computing unit that computes the gradient fuel consumption amount for each interval by multiplying the distance of the interval and a fuel consumption rate determined according to a road average gradient, wherein the estimated fuel consumption amount is obtained by adding the cruise fuel consumption amount, the gradient fuel consumption amount, and the vehicle-speed fluctuation fuel consumption amount. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification