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1. A fuel-saving path planning navigation system, comprising:
a plurality of sensors monitoring a plurality of roads respectively and periodically reporting traffic information to a server, wherein the plurality of sensors detect average speed of vehicles on the plurality of roads, and the plurality of sensors report the traffic information with different cycles according to peak and off-peak periods; in the peak period, a first detection cycle is assigned to the plurality of sensors; in the off-peak period, a second detection cycle, which is longer than the first detection cycle, is assigned to the plurality of sensors; the server comprising:
a storing module storing the traffic information as history information, which includes the average speed of vehicles;a processing module estimating how many vehicles on one of the plurality of roads based upon the history information, calculating fuel consumption of each possible planned path including current fuel consumption based on real-time traffic and future fuel consumption based on the historical information, and planning a most fuel-efficient path based on a following relation:
Fx=ρ×Fx,N+(1−ρ)×Fx,H; wherein Fx is a fuel consumption of a road x, ρ is a real number between 0 and 1, Fx,N is a real time fuel consumption of the road x, and Fx, His a fuel consumption from the history information of the road x; wherein the processing module further determines whether to planning a new most fuel-efficient path based on the real-time traffic while driving on the most fuel-efficient path; wherein the most fuel-efficient path is kept if the fuel consumption of the new most fuel-efficient path is not 10% better than the most fuel-efficient path.
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