Navigation device and method of use having two separate route searching devices
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsAkihito Tada, Hironobu Sugimoto, Masayuki Yurimoto
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Abstract
A route search location determining section (12d) of a mobile body (10) decides whether to conduct a route search at the mobile body (10) or to request the route search to an information center (30) based on various conditions such as priorities and how old the map data version is. In this manner, effective search can be conducted using two distinct route searching devices. Also, a current position calculating section (12a) can execute map matching by adding route data obtained from the information center (30) as a map matching candidate.
Claims25
A navigation device mounted on a mobile body for executing route guidance, said navigation device comprising:
- a mobile body route searching device for conducting a route search using a map database maintained thereon, to obtain route guiding data;
- an information center route searching device for also conducting a route search to obtain route guiding data from an information center using wireless communication;
- and
- a search selecting device that determines which device to use for obtaining route data before route search by the mobile body route searching device and obtaining route guiding data by the information center route searching device are executed, wherein the mobile body route searching device obtains initial route guiding data with no communication with the information center.
A navigation device mounted on a mobile body for executing route guidance, said navigation device comprising:
- a mobile body route searching device for conduction route search using a map database maintained thereon, to obtain route guiding data;
- an information center route searching device for obtaining route guiding data from an information center using wireless communication;
- a search selecting device for determining whether to use said mobile body route searching device or to use said information center route searching device;
- and
- a display device for displaying a search result, wherein
- said search selecting device selects both a mobile body route searching device and an information center route searching device and displays both search results from both devices by overlapping on the same display device.
A navigation device mounted on a mobile body for executing route guidance, said navigation device comprising:
- a position detecting device for detecting a position of said mobile body;
- a mobile body terminal for conducting a route search using a map database containing map data maintained thereon, to obtain route data;
- a center route data obtaining device for also conducting a route search to obtain different route data from an information center using wireless communication, and
- a map matching device for comparing said detected mobile body position and said different route data obtained from said information center to compensate for the detected position of the mobile body relative to said different route data, wherein the mobile body terminal obtains initial route guiding data with no communication with the center route data obtaining device.
A navigation device mounted on a mobile body for executing route guidance, said navigation device comprising:
- a position detecting device for detecting a position of said mobile body;
- a mobile body terminal for conducting route search using a map database containing map data maintained thereon, to obtain route data;
- a center route data obtaining device for obtaining route data from an information center using wireless communication;
- and
- a map matching device for comparing said detected mobile body position and said route data obtained from said information center to compensate the position of the mobile body,
- wherein said map matching device compares route data obtained from the information center and map data maintained at the mobile body terminal and executes map matching using only said map data maintained at the mobile body terminal when route data overlaps on a road.
A navigation device mounted on a mobile body for executing route guidance, said navigation device comprising:
- a position detecting device for detecting a position of said mobile body;
- a mobile body terminal for conducting route search using a map database containing map data maintained thereon, to obtain route data;
- a center route data obtaining device for obtaining route data from an information center using wireless communication;
- and
- a map matching device for comparing said detected mobile data position and said route data obtained from said information center to compensate the position of the mobile body,
- wherein said map matching device normally executes a map matching process using map data maintained at the mobile body except when a detected position of the mobile body is off the roads on the map data, in which case route guiding data obtained from the information center is added as a map matching candidate and the map matching process is executed.
A navigation method for executing route guide at a mobile body, comprising the steps of:
- selecting use of at least one of route guiding data obtained by conducting a mobile body route search using a map database maintained at said mobile body and route guiding data obtained by conducting a route search at an information center using wireless communication before a route search is conducted;
- subsequently executing the selected route search;
- and
- obtaining initial route guiding data by using the map database maintained at the mobile body with no communication with the information center.
Dependencies are inferred from the claim text.