EP0675341A1
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EP
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Car navigation system
Assignee: Honda Motor Co Ltd
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Filing: 1995-03-29
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Granted: —
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Expires: 2015-03-29
Abstract
Abstract A car navigation system (1) includes a route judgement means (6) for judging whether the driver should head for an input place name (5a) in order to reach a destination (4a), and judgement result means (8) for outputting a judgement result, so that a car can be guided and navigated along a suitable route to the destination by inputting place names written on road signs or the like. The judgement result is output with a voice message or image display (9). When plural place names are input, the judgement is made on each of the place names, and the most suitable place name is selected and output.
Inventors
- 👤 Yasuhiro Sawada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 05:38
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/26; G01C21/34; G01C21/36; G01C21/3605; G01C21/3664; G01C21/3667; G01C21/367; G01C21/3673; G09; G09B; G09B29/00; G09B29/10; G09B29/106
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
59 words
A car navigation system comprising: a road map data base; a car position detecting device for detecting the current position of a car; place-name input means for inputting a place name; route judgement means for judging whether the input name is suitable for a route extending to a destination; and judgement result output means for outputting a judgement result.
Claim 2
Dependent Claim
48 words
The car navigation system as claimed in claim 1, wherein said road map data base is provided with place-name display data for place names to be displayed on a map which is reproduced on a screen of an image display device, and pronunciation data for the place means.
Claim 3
Dependent Claim
51 words
The car navigation system as claimed in claim 1 or 2, wherein said road map data base is provided with place-name display data of the place names to be displayed on the map, data on formal pronunciations for the place names and data on the other pronunciations for the place names.
Claim 4
Dependent Claim
29 words
The car navigation system as claimed in claim 1, 2 or 3, wherein said destination setting means and said place-name input means are constructed by a voice recognition device.
Claim 5
Dependent Claim
36 words
The car navigation system as claimed in claim 1, 2 or 3, wherein said destination setting means and said place-name input means are constructed by a handwrite character input device and a handwrite character recognition device.
Claim 6
Dependent Claim
64 words
The car navigation system as claimed in any of claims 1 to 5, wherein said route judgement means judges whether the input place name is suitable on the basis of an intersection angle between a line connecting the current position of the car and the destination and a line connecting the current position of the car and the position of an input place name.
Claim 7
Dependent Claim
75 words
The car navigation system as claimed in any of claims 1 to 5, wherein said route judgement means compares a route extending from the current position of the car to the destination with a route extending from the current position of the car to the position of an input place name, and judges whether the input place name is suitable on the basis of the distance or ratio of a common portion between the routes.
Claim 8
Dependent Claim
60 words
The car navigation system as claimed in any of claims 1 to 5, wherein said route judgement means sets a prescribed area at both sides of a line connecting the current position of the car and the destination, and judges the input place name to be suitable as a via-place if the input place name is within the set area.
Claim 9
Dependent Claim
58 words
The car navigation system as claimed in any of claims 1 to 5, wherein when the destination is far away from the current position of the car, said route judgement means judges the input place name to be suitable as a via-place if the input place name is located at a prescribed distance or less from the destination.
Claim 10
Dependent Claim
102 words
The car navigation system as claimed in any preceding claim, wherein when the input place name contains a route such as a superhighway on which the car can run at a higher speed than on a general road, said route judgement means converts the distance of the route to a shorter value than the actual distance thereof (on the basis of a preset reduction rate) to calculate the distance to the destination, and a route through which the car arrives at the destination most early is selected/ identified on the basis of the converted distance (calculated in consideration of an arrival time).
Claim 11
Dependent Claim
20 words
The car navigation system as claimed in any preceding claim, wherein said judgement result output means comprises a voice synthesizer.
Claim 12
Dependent Claim
78 words
The car navigation system as claimed in any preceding claim, wherein said judgement result output means comprises an image display device, and displays a map containing the current position of the car on a screen of said image display device and further displays a line extending from the current position of the car to the destination and a line extending from the current position of the car to the position of the input place name on the screen.
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JPH0256590A
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JPH03257485A
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US5177685A
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WO1992009866A1
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