Traffic state predicting apparatus

• US 8,180,557 B2
• Filed: 08/09/2007
• Issued: 05/15/2012
• Est. Priority Date: 09/27/2006
• Status: Active Grant

• Current Assignee: Clarion Co., Ltd. (Faurecia SA)
• Original Assignee: Xanavi Informatics Corporation (Hitachi, Ltd.)
• Inventors: Yamane, Kenichiro, Takahashi, Hirotaka, Okude, Mariko
• Primary Examiner(s): Tran, Khoi
• Assistant Examiner(s): PATTON, SPENCER D
• Application Number:
  US11/836,551
• Publication Number:
  US 20080077316A1
• Time in Patent Office: 1,741 Days
• Field of Search: 701/117, 701/118, 701/119, 701/204, 340/995.13, 340/995.27
• US Class Current: 701/119
• CPC Class Codes: G01C 21/3694 Output thereof on a road map
• CPC Class Codes: G08G 1/0104 Measuring and analyzing of parameters relative to traffic conditions

Abstract

A traffic state predicting apparatus, which predicts congestion states of parts of a link based on limited information (the travel time for the link), comprises storage means that stores link data including a link length of each link forming part of a road on a map and parameters including, for each link, a smooth traffic speed indicting being smooth, a congested traffic speed indicating being congested, and a congestion reference position which is a reference position for a congested section; means that acquires a predicted travel time for the link; and congestion degree classified section calculating means that obtains sections classified according to their level of congestion in the link with use of the predicted travel time and the parameters.

Claims

1. A traffic state predicting apparatus comprising:

a processor configured to acquire traffic information on a predicted travel time for each of one or more links constituting a road on a map, sections in the link each having a determined level of congestion, a congestion reference position being a reference position for the section for which the level of congestion is determined, and a total section length of the sections for each of which the level of congestion is determined to be congested; and

a processor configured to create parameters on each of the links based on which the sections in each of the links are obtained for which the level of congestion is determined,

wherein the parameters include a smooth traffic speed indicating a threshold value of a traffic speed for which a level of congestion is determined to be smooth, a congested traffic speed indicating a threshold value of a traffic speed for which the level of congestion is determined to be congested, and congestion reference positions each of which is a reference position for a congested section,

wherein the processor configured to create comprises;

travel speed calculating means that obtains travel speeds for each level of congestion for each of the links;

means for arranging the travel speeds for each level of congestion in ascending order or descending order and, for each level of congestion, acquiring travel speeds in predetermined percentiles of all the travel speeds;

congestion degree classifying section calculating means that obtains sections into which each of the links is divided based on the predicted travel time and the parameters, each of the sections in each of the links having a determined level of congestion; and

means for obtaining an evaluation value based on matching between the obtained sections and sections according to their level of congestion contained in the traffic information,

wherein the travel speed for each level of congestion that gives the highest evaluated value is included in the parameters.

2. The traffic state predicting apparatus according to claim 1, wherein the congestion degree classifying section calculating means obtains the sections in each of the links, wherein a total of section travel times correspond to the predicted travel time for each of the links, each of the section travel times being a time to travel through each of the sections, and wherein a total of section lengths correspond to a link length of each of the links.

3. The traffic state predicting apparatus according to claim 1, further comprising:

means for acquiring a representative travel speed of each of the links,

wherein the travel speed calculating means uses the representative travel speed for the congested traffic speed if the total section length of the sections for each of which the level of congestion is determined to be congested is equal to or greater than a predetermined proportion of the link length of each of the links, and the representative travel speed for the smooth traffic speed if the total length of the sections for each of which the level of congestion is determined to be smooth is smaller than the predetermined proportion of the link length of each of the links.