Xanavi Informatics Corporation

Hitachi, Ltd.

Other

Hcx Corporation

Nissan Motor Company Limited

Opnext Japan, Inc.

Clarion Co

Yoshinori Endo

Kozo Nakamura

Kimiyoshi Machii

Mariko Okude

Shigeru Matsuo

Toshio Fujiwara

Shinichi Amaya

Toshimichi Minowa

Hiroshi Shojima

Katsuaki Tanaka

Motoki Hirano

Akio Sumizawa

Tokuji Yoshikawa

Michio Morioka

Junsuke Fujiwara

Hideo Hiroshige

Kenichiro Yamane

Satoru Kuragaki

Norimasa Kishi

Masaki Watanabe

Hiroyuki Satake

Kimiya Yamaashi

Masatoshi Kumagai

Kimio Nishino

Takayoshi Yokota

Jiro Takezaki

Kaoru Harada

Tetsumori Aikawa

Hiroshi Kuroda

Hiroshi Takenaga

Yasuhiro Gunji

Mitsuru Nakamura

Takaharu Ishida

Tadashi Kamiwaki

Hiroto Morizane

Hiroshi Ohno

Masahiko Saito

Takumi Fushiki

Ryoichi Komuro

Ichiro Hondo

Ke'nichirou Kurata

Okude Mariko

Taketo Tsuburaya

Noriyuki Abe

Mitsuo Kayano

Yukihiro Kawamata

Kazuaki Takano

Tomoaki Hiruta

Tomoaki Nakamura

Yoshitaka Atarashi

Yoshitaka Sumitomo

Predicted traffic information of a plurality of time bands is downloaded once for a mesh area. Moreover, time band range of the predicted traffic information to be downloaded is increased as distance from current position to the mesh area increases. Furthermore, the time band range is increased for the morning and the evening. Moreover, as difference between the current time and departure time becomes larger, the time band range is increased.

Navigation device traffic information reception method

When receiving a traffic information providing request, a traffic information providing apparatus analyzes which area's traffic information is requested based on the received request information. Traffic information of road links located in the requested area is read from the traffic information, and it is determined whether the road links' traffic information is similar or not. Similar links configure a link group, and traffic information corresponding to the link group is created. Traffic information of the configured link group is delivered to an in-vehicle information apparatus.

Traffic information providing system, apparatus, method, and in-vehicle information apparatus

A route to a destination in which required travel time barely varies depending on weather is searched for without referring to weather forecast or weather information. A route search device comprises following means: a storage medium for storing traffic information including travel times by weather conditions for each link comprising a road on a map; a pointing device which sets a starting point and a destination; a weather condition-based route search module that determines the shortest travel time route from the starting point to the destination by weather conditions using the traffic information stored in the storage medium; a link series-identifying module that extracts link series which vary with weather conditions from link series comprising the shortest travel time route determined by the weather condition-based route search module, determines the required travel time by weather conditions for the each link series that vary with weather conditions by using the traffic information stored in the storage medium, and identifies a link series whose required travel time barely varies depending on weather conditions; and a link series-registering medium that registers the link series identified by the link series-identifying module as a link series comprising a guide route from the starting point to the destination.

Route search device and route search method

Distribution map data for distributing a map by communication includes road data representing position information on the roads contained in a plurality of compartments and integrating name data for integrating name information for the same roads contained in the plurality of compartments without duplicating them.

Computer product having distribution map data, distribution map data generating method, distrubution map data generating apparatus and terminal device

A traffic information providing system externally acquires traffic information including information relating to the travel time of a link, calculates a travel time for a non-provision link to which no travel time is provided through estimate/complement operation. The estimate/complement operation is carried out with use of travel times, emergencies, travel times of links in the vicinity of the non-provision link, and so on, obtained in the near past. The system stores and statistically processes the externally-acquired traffic information, and also estimates a travel time in the near future. When there is an abnormality in the acquired traffic information, the system deletes the abnormality, regards the information as a non-provision link, calculates a probability distribution of travel times of links, calculates a probability distribution of travel times of the entire route made up of a plurality of links, and also calculates a probability for a specific travel time range.

Traffic information providing system and car navigation system

An information center () for collecting traffic information stores in its memory device the latest map data. Then, it is determined through a terminal device () whether or not history information has been recorded in a data recording medium () mounted in a navigation device (), and when it is determined that the history information has been recorded, the map data in the data recording medium are updated to the latest map data. The data recording medium () is removable from the navigation device (). Statistical traffic information may be updated along with the updating of the map data. Further, when history information is directly uploaded to the information center, an identifier is attached to the uploaded information.

Traffic information collecting system for navigation device

A navi-server which is provided with information from a traffic information providing center, and presents and provides information made on the information to a terminal is characterized by being equipped with a first storage means storing the information provided from the traffic information providing center; a traffic jam statistical making means which makes traffic jam statistical information including traffic jam information in a predetermined point and a predetermined zone as well as a reliability of the traffic jam information, based on information stored in the first storage means; and a second storage means storing information made by the traffic jam statistical making means, wherein the navi-server presents and provides the information stored in the second storage means to the terminal, based on a request of the terminal and at a predetermined timing.

Display method of navi-server and navigation

The present invention aims to provide a technique that can download traffic information in a more efficient manner, in a navigation system including a traffic information distribution server and a terminal unit. The information distribution server narrows down possible traffic information to be used for processing at the terminal unit before downloading the information to the unit. For example, the traffic information distribution server may include a traffic information obtaining unit for obtaining traffic information pertaining to a link configuring a route or the periphery of the link (e.g., mesh area including the link), and to a predicted running duration of the link; and a sending unit for downloading the obtained traffic information to the terminal unit. The server or the terminal unit may narrow down the object for download.

Navigation system

A navigation device that calculates an expected travel time or an expected arrival time for each retrieved route, using link costs predetermined for calculation of expected travel times regardless of search conditions. As the link costs for the calculation of expected travel times, are used link travel times obtained by statistically processing traffic information collected in the past, for example.

Route search method for navigation device

Route search is performed considering the fact that traffic conditions differ according to lane even for the same road. A navigation device performs route search, using link costs (link travel times) classified by lane. For example, the navigation device searches for a route having the lowest total cost to the destination, using link data that determine cost for each lane of a component link of a road on a map. A cost of a lane on which a vehicle runs to move to a next link, being the cost of any lane of the link, is used as a cost of a link on a route.

Navigation device used for a route search

A navigation device displays predicted traffic information downloaded from a server device and statistical traffic information stored in a storage unit, on the same screen. Both information items may be displayed in such a manner that at least a part of them is overlaid (a superimposed display). The predicted traffic information may be superimposed on the statistical traffic information. When traffic information of the same time band of the same object (link, mesh area) exists in both the information items, one thereof may be selected to be displayed.

Navigation device

A traffic information prediction system, including a traffic information prediction apparatus, of the present invention comprises travel status measuring means for measuring a travel status of a vehicle and accumulating it as travel record information, and traffic information predicting means for predicting traffic information on a route on the basis of the travel record information and statistical traffic information to predict an arrival time to any place on a route containing the destination. The traffic information predicting means compares a traveling trace based on the statistical traffic information and the traveling trace based on the travel record information to calculate the degree of progress of the travel record based on the statistical traffic information, and correct the traveling trace based on the statistical traffic information on the basis of the degree of progress.

Traffic information prediction apparatus

A recommended route is searched by the use of traffic information collected in the past. A map/statistical traffic data storage devicestores map data including link data of respective links constituting roads on a map, and statistical data including travel time or moving speeds of the respective links determined by statistical values of traffic information collected in the past. Said statistical data is classified every condition of collection of traffic information. A navigation device searches a recommended route from a departure position to a destination by using the map data stored in the map/statistical traffic data storage device and statistical data corresponding to a day type and a weather type which constitute conditions of search, out of statistical data stored in the map/statistical traffic data storage device

Route search method and traffic information display method for a navigation device

In an on-vehicle terminal system operating a plurality of operating systems, control of peripheral devices connected to the on-vehicle terminal system can be continued even if one of the operating systems is stopped. A second operating system monitors an operating status of a first operating system using an OS status monitoring function. When the first operating system stops, a list recording allocation of the peripheral devices is updated to switch the allocation to the second operating system. By doing so, an interrupt signal from a peripheral device is allocated to the second operating system, and accordingly the second operating system can control the peripheral device.

On-vehicle terminal system

Growing community of inventors

Mito, Japan

Yoshinori Endo