Abstract A navigation apparatus has: a current position detecting device for detecting current position of a vehicle in which the device is installed; an information storing device for storing map information and other route information for route search and route guidance; an input device for inputting instructions; an output device for outputting information for route guidance; and a central processing device. The central processing device has route searching means for searching for a route from the current position to a destination or a passing point on the basis of the map information, route storing means for temporarily storing the route found by the route searching means, and route guidance control means for outputting to the output device a signal for executing route guidance based on the route. The apparatus determines a location on a road located a predetermined distance ahead in the travel direction from the current position, as a search starting location or as a route guidance starting location.
Inventors
👤 Kihachi Hayasida
👤 Takeshi Yanagikubo
Bibliographic Details
Application Number—
JurisdictionEP
Data Sourcegoogle_patents
Last Synchronized2026-10-30 02:39
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/26; G01C21/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
228 words
A vehicular navigation apparatus for guidance along a preset route, comprising: a current position detecting device for detecting a current position of a vehicle in which the device is installed; an information storing device for storing map information and other route information for route search and route guidance; an input device for inputting at least one of a destination and a passing point and for inputting an instruction to search for a route to said at least one of the destination and the passing point on the basis of the current position detected by the current position detecting device; an output device for outputting information for route guidance; and a central processing device having route searching means for searching for a route from the current position to said at least one of the destination and the passing point on the basis of the map information, route storing means for temporarily storing the route found by the route searching means, and route guidance control means for outputting to the output device a signal for executing route guidance based on the route, the route searching means determining as a route search starting location a location on a road that is stored in the information storing device and that is located a predetermined distance ahead in a travel direction from the current position, and searching for a route from said location.
Claim 2
Dependent Claim
42 words
A vehicular navigation apparatus according to claim 1, wherein when performing route search again after a route has been stored in the route storing means, the route searching means performs route search on the basis of an instruction from the input means.
Claim 3
Dependent Claim
58 words
A vehicular navigation apparatus according to claim 1 or 2, wherein the central processing device further comprises off-route detecting means for determining whether a current position detected by the current position detecting device has deviated from the route, and wherein the route searching means performs route search again if the off-route detecting means detects deviation from the route.
Claim 4
Dependent Claim
69 words
A vehicular navigation apparatus according to claim 2 or 3, wherein if the route searching means has performed route search again, the route guidance control means erases the previously found route from the route storing means and outputs a signal for executing route guidance based on a currently found route under a condition that the route search has been completed and the vehicle has traveled through a predetermined distance.
Claim 5
Dependent Claim
35 words
A vehicular navigation apparatus according to claim 2 or 3, wherein when the route searching means performs route search again, the route guidance control means provides a predetermined navigation guidance until the route search ends.
Claim 6
Independent Claim
44 words
An apparatus according to any of claims 1 to 5, wherein if the vehicle is not traveling on a guidance possible road, the route searching means waits until the vehicle comes to travel on a guidance possible road, and then searches for a route.
References Cited (Backward Citations)
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