Traffic information estimating system

• US 7,899,612 B2
• Filed: 04/13/2009
• Issued: 03/01/2011
• Est. Priority Date: 03/09/2005
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Fushiki, Takumi, Kimita, Kazuya, Yokota, Takayoshi, Kumagai, Masatoshi
• Primary Examiner(s): Black; Thomas G
• Assistant Examiner(s): Chen; Shelley
• Application Number:
  US12/422,343
• Publication Number:
  US 20090198441A1
• Time in Patent Office: 687 Days
• Field of Search: 701117-119
• US Class Current: 701/117
• CPC Class Codes: G08G 1/0104 Measuring and analyzing of parameters relative to traffic conditions

Abstract

A traffic information system includes: a past information database for storing past information, which is collected for road links in a predetermined area, of a past mobile object on a road; a current information database for storing running information, which is collected for the road links in the predetermined area, of a current mobile object; link correlation analyzing means in which correlations of traffic information among each road link in the predetermined area are calculated from the past information stored in the past information database, and output as link correlation information among the road links; combination calculating means for calculating weighting information for obtaining the current information as a sum of the link correlation information; and traffic information estimating means for calculating estimated traffic information for a link where the current information is not collected based on the link correlation information and the weighting information.

Claims

1. A traffic information estimating system, comprising:

a first center provided with;

a past information database for storing past information, which is collected for road links in a predetermined area, of a past mobile object on a road; and

link correlation analyzing means for calculating correlations of traffic information among each road link in the predetermined area from the past information stored in the past information database, and outputting as link correlation information among the road links; and

a second center provided with;

a current information database which stores running information that is collected for the road links in the predetermined area, of a current mobile object;

combination calculating means for calculating weighting information to obtain the current information as a sum of the link correlation information transmitted from the first center; and

traffic information estimating means for calculating estimated traffic information for a link where the current information is not collected based on the link correlation information and the weighting information transmitted from the first center,

wherein the correlations of traffic information among each road link are bases that are calculated by a principal component analysis with missing data, and the weighting information is a weighting coefficient of the bases.

2. The traffic information estimating system according to claim 1, further comprising a map database which stores connection information of each road link, wherein the traffic information estimating means outputs complementary traffic information to a road link where the current information is not collected based on the current information, the estimated information, and the map information.