Route guidance system, information delivery center, and vehicular route guidance apparatus
First Claim
1. A navigation system comprising:
- (a) an information center comprising an information center side transmission/reception section for communication, a route search section for searching for a route, based on a present position and destination, and an information generating section for generating guidance information for guidance along the route found by the route search section and for extracting major guide point information for major guide points, along the route found by the route search section, from the guidance information; and
(b) a vehicular apparatus comprising a destination setting section for setting a destination, a present position determination section for determining the present position, and a guidance output section for outputting major guide point information including all major guide points on the route found by the route search section and additional route guidance information, a vehicle side transmission/reception section for transmitting the set destination and the determined present position to the information center and for receiving the major guide point information during a first period of transmission from the information center and for receiving the additional route guidance information during a second period of transmission from the information center, subsequent to said first period, and storage means for storing the received information, said guidance output section giving guidance limited to the major guide point information when the vehicle side transmission/reception section is unable to receive the additional route guidance information from the information center.
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Accused Products
Abstract
An information center generates packets of route guidance information, each corresponding to a prescribed road length of a recommended route. The information center may generate major guide point information and guidance information and transmit both to a vehicular apparatus. The vehicular apparatus provides guidance only for major guide points based on the received major guide point information if it cannot receive the guidance information. According to another aspect of the invention, if the end of a route segment which was the subject of the preceding route guidance information is on an expressway or toll road, guidance information for a preliminary route from that end to an escape position ahead on the expressway or toll road is first transmitted and then information for a remaining route, that is a segment of the recommended route having the prescribed road length minus the preliminary route, is then transmitted. If communication with the information center is lost, the vehicular apparatus performs guidance for the preliminary route to an interchange, for example, of the expressway using the preliminary route guidance information.
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Citations
20 Claims
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1. A navigation system comprising:
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(a) an information center comprising an information center side transmission/reception section for communication, a route search section for searching for a route, based on a present position and destination, and an information generating section for generating guidance information for guidance along the route found by the route search section and for extracting major guide point information for major guide points, along the route found by the route search section, from the guidance information; and
(b) a vehicular apparatus comprising a destination setting section for setting a destination, a present position determination section for determining the present position, and a guidance output section for outputting major guide point information including all major guide points on the route found by the route search section and additional route guidance information, a vehicle side transmission/reception section for transmitting the set destination and the determined present position to the information center and for receiving the major guide point information during a first period of transmission from the information center and for receiving the additional route guidance information during a second period of transmission from the information center, subsequent to said first period, and storage means for storing the received information, said guidance output section giving guidance limited to the major guide point information when the vehicle side transmission/reception section is unable to receive the additional route guidance information from the information center. - View Dependent Claims (2)
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3. An information center comprising:
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(a) a transmission/reception section for communication;
(b) a route search section for searching for a route; and
(c) an information generating section for generating guidance information for the route found by the route search section, said guidance information including major guide point information relating to major guide points along the route found, wherein the information center searches for the route based on a present position and a destination that are received from a vehicular apparatus and firstly transmits, to the vehicular apparatus, generated major guide point information taken from the guidance information and subsequently transmits the remaining guidance information. - View Dependent Claims (4, 5)
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6. A vehicular apparatus for use in a vehicle comprising:
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(a) a transmission/reception section for communication;
(b) a destination setting section for setting a destination;
(c) a present position determination section for determining a present position; and
(d) a guidance output section for outputting guidance information including major guide point information relating to major guide points and additional route guidance information, wherein the vehicular apparatus transmits the destination and the present position to an information center, and receives, from the information center, firstly, major guide point information and, subsequently, route guidance information for route guidance along a route that has been found by a search based on the destination and the present position, and gives guidance for the major guide points received first when unable to receive the additional route guidance information, wherein the major guide point information includes information for plural major guide points along the route which has been found by the search. - View Dependent Claims (7, 8)
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9. A route guidance system comprising:
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an information delivery center for generating route guidance information for route segments of a recommended route from a present position to a destination in response to a request from a vehicular route guidance apparatus and for transmitting the generated route guidance information to the vehicular route guidance apparatus in a series of transmissions, each transmission providing guidance information for a route segment of the recommended route, each route segment having a prescribed length, the information delivery center comprising;
search means for searching for the recommended route from the present position to the destination;
preliminary route guidance information generating means for generating, if an end of a route segment, for which the preceding transmission provided guidance information, is on an expressway or a toll road, preliminary route guidance information for a preliminary route from the route segment end to an escape position, ahead of the route segment end, on the expressway or toll road;
remaining route guidance information generating means for generating remaining route guidance information for a remaining route that is a route segment of the prescribed road length minus the preliminary route;
transmitting means for first transmitting the preliminary route guidance information to the vehicular route guidance apparatus and then transmitting the remaining route guidance information to the vehicular route guidance apparetus; and
wherein said vehicular route guidance apparatus performs route guidance using the route guidance information transmitted from the information delivery center, and comprises;
route guidance means for providing route guidance for the recommended route ahead of the route segment end, when communication with the information delivery center has failed, from the route segment end to an escape location on the expressway or toll road using the preliminary route guidance information that has been received. - View Dependent Claims (10, 11, 12)
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13. An information center for receiving information for a present position and information for a destination from a vehicular route guidance apparatus, for generating route guidance information corresponding to segments of a recommended route, each segment having a prescribed road length, and for transmitting the generated route guidance information to the vehicular route guidance apparatus, the information delivery center comprising:
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search means for searching for the recommended route from the present position to the destination;
preliminary route guidance information generating means for generating, if an end of a route segment which was is the subject of a preceding transmission of route guidance information is on an expressway or toll road, preliminary route guidance information for a preliminary route from the segment end to an escape location ahead on the expressway or toll road;
remaining route guidance information generating means for generating remaining route guidance information for a remaining route that is a segment of the recommended route having the prescribed road length minus the preliminary route; and
transmitting means for first transmitting the preliminary route guidance information to the vehicular route guidance apparatus and then transmitting the remaining route guidance information to the vehicular route guidance apparatus.
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14. A vehicular route guidance apparatus for receiving, in succession, transmissions of route guidance information from an information delivery center, each transmission containing guidance information for a segment of a recommended route, said segment having a prescribed road length, and for providing route guidance to a destination using route guidance information provided by the succession of transmissions, said vehicular route guidance apparatus comprising:
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route guidance information storing means for receiving, from the information delivery center, preliminary route guidance information, generated when an end of a segment, which was the subject of route guidance information of a preceding transmission, is on an expressway or toll road, said preliminary route information corresponding to a preliminary route from the end of the segment to an escape location ahead on the expressway or toll road, and for receiving from the information center remaining route guidance information for a remaining route that is a segment of the recommended route having the prescribed road length minus the preliminary route, and for storing the remaining route guidance information and the preliminary route guidance information; and
route guidance means for providing route guidance for the recommended route ahead of the segment end, when a failure occurs in communication with the information delivery center, from the segment end to the escape location on the expressway or toll road using the received preliminary route guidance information.
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15. A route guidance system for a vehicle comprising:
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an information delivery center for transmitting, to a vehicular route guidance apparatus, route guidance information for route guidance to a destination, said information delivery center comprising;
search means for searching for a recommended route to the destination; and
transmitting means for transmitting, to the vehicular route guidance apparatus, route guidance information for guidance along the recommended route; and
wherein the vehicular route guidance apparatus provides route guidance, based on the route guidance information transmitted from the information delivery center, and comprises;
data storage means in which road data is stored; and
re-search means for again searching for a route using the stored road data, when a failure has occurred in communication with the information delivery center and the vehicle has exited an expressway or toll road. - View Dependent Claims (16, 17, 18, 19)
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20. A method for communication of guidance information between a central information center and plural vehicles each equipped with a vehicular navigation apparatus, said method comprising:
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transmitting from the vehicular navigation apparatus to the central information center information identifying a present position of a vehicle and a destination;
searching, within the central information center, to determine a recommended route from the present vehicle position to the destination;
generating guidance information for the recommended route within the central information center;
transmitting the generated guidance information, as a series of transmissions, to the vehicular navigation apparatus, each of said transmissions providing guidance information for a segment of the recommended route having a prescribed length, the provided guidance information including guidance information for a plurality of points along the prescribed length of the segment, each of said transmissions including a first portion of guidance information of short duration to be utilized for guidance in the event of a failure in communication between the central information center and the vehicular navigation apparatus and a second portion of guidance information as additional, more detailed guidance information for the route segment, exclusive of the guidance information for the plurality of points and having a duration significantly longer than that of said first portion.
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Specification