The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 27, 2012
Filed:
Sep. 14, 2011
Takumi Fushiki, Hitachi, JP;
Kenichiro Yamane, Hitachi, JP;
Manabu Kato, Hitachimirai, JP;
Shinichi Amaya, Higashiyamato, JP;
Takumi Fushiki, Hitachi, JP;
Kenichiro Yamane, Hitachi, JP;
Manabu Kato, Hitachimirai, JP;
Shinichi Amaya, Higashiyamato, JP;
Xanavi Informatics Corporation, Zama-shi, JP;
Abstract
There is provided a method and a device for accurately estimating traffic information of a link having no traffic information even if different types of roads are mixed. The device finds a parameter characterizing a damping curve of a quantity of change of relative speed based on stored traffic information for links on a city center side on a minimum-time cost route connecting the city center and suburbs, finds a quantity of change of relative speed of the link having no observed traffic information and estimates its traffic information based on the damping curve. The device also calculates a ratio of quantities of change of relative speed of two links whose road types change as a speed change similarity ratio and estimates traffic information of the link of a second road type from known traffic information of the link of a first road type by using that ratio.