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US5283575A
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System and method for locating a travelling vehicle
Assignee: Daihatsu Nissay
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Filing: 1991-11-08
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Granted: 1994-02-01
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Expires: 2011-11-08
Abstract
Abstract A vehicle navigation system helps locate the vehicle on a road network by overcoming, through the use of fuzzy logic, the errors of positioning sensors and routing computers. In the system, sensors continually feed position coordinates to a processing unit that traces the vehicle's path in a road database. Fuzzy logic-based reasoning is used to determine the most probable location of the vehicle, whether off- or on-road, thereby correcting errors in its raw path as sensed or computed.
Inventors
- 👤 Wei-Wen Kao
- 👤 Liang-Jong Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:53
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/26; G01C21/28; G01C21/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
A vehicle navigation system, which comprises: means for sensing a plurality of successive positions of said vehicle to create a sensed representation of a vehicle travel path; means for storing a map of roads in a vicinity of said vehicle; means for defining an actual vehicle travel path in said map; means for matching said sensed representation of a vehicle travel path with said actual vehicle travel path; and said means for matching including a plurality of fuzzy logic elements; said fuzzy logic elements including: a fuzzifier receiving said plurality of successive positions, and effective to produce an initial fuzzy set; an inference engine receiving said initial fuzzy set, said map, and a set of inference rules and membership functions for producing a plurality of final fuzzy sets; a defuzzifier effective for producing a set of crisp values from said final fuzzy sets; and said crisp values being effective to determine a map-matched vehicle position.
Claim 2
Dependent Claim
155 words
A vehicle navigation system, which comprises: means for sensing a plurality of successive positions of said vehicle to create a sensed representation of a vehicle travel path; means for storing a map of roads in a vicinity of said vehicle; means for defining an actual vehicle travel path in said map; means for matching said sensed representation of a vehicle travel path with said actual vehicle travel path; and said means for matching including a plurality of fuzzy logic elements; said fuzzy logic elements including: a fuzzifier receiving said plurality of successive positions, and effective to produce an initial fuzzy set; an inference engine receiving said initial fuzzy set, said map, and a set of inference rules and membership functions for producing a plurality of final fuzzy sets; a defuzzifier effective for producing a set of crisp values from said final fuzzy sets; and said crisp values being effective to determine a map-matched vehicle position.
Claim 3
Dependent Claim
24 words
A vehicle navigation system as in claim 1, wherein said means for sensing includes at least one of GPS, Loran C, and dead reckoning.
Claim 4
Independent Claim
86 words
A method for locating a position of a vehicle comprising: sensing a plurality of successive positions of said vehicle to produce a stored representation of a vehicle travel path; comparing said stored representation with a plurality of vehicle travel paths in a map; the step of comparing including employing fuzzy logic to match said stored representation with a one of said plurality of vehicle travel paths, whereby a best matching path is chosen; and determining an actual position of said vehicle from said best matching path.
Claim 5
Independent Claim
86 words
A method for locating a position of a vehicle comprising: sensing a plurality of successive positions of said vehicle to produce a stored representation of a vehicle travel path; comparing said stored representation with a plurality of vehicle travel paths in a map; the step of comparing including employing fuzzy logic to match said stored representation with a one of said plurality of vehicle travel paths, whereby a best matching path is chosen; and determining an actual position of said vehicle from said best matching path.
Claim 6
Dependent Claim
81 words
A vehicle navigation system comprising: a plurality of positioning sensors to sense a plurality of successive positions of said vehicle; means for comparing said plurality of positions with a plurality of roads on a digitized map; fuzzy logic means for choosing a best fit from among a plurality of fits between said plurality of positions and said plurality of roads; and means, based on said best fit, for determining a vehicle present position on a one of said plurality of roads.
Claim 7
Dependent Claim
81 words
A vehicle navigation system comprising: a plurality of positioning sensors to sense a plurality of successive positions of said vehicle; means for comparing said plurality of positions with a plurality of roads on a digitized map; fuzzy logic means for choosing a best fit from among a plurality of fits between said plurality of positions and said plurality of roads; and means, based on said best fit, for determining a vehicle present position on a one of said plurality of roads.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-31 | 1997-08-02 | 1998-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-31 | 2001-08-02 | 2002-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-31 | 2005-08-02 | 2006-02-01 | $7700.00 | Window Closed / Lapsed |