US4964052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Navigation device for use in a vehicle
Assignee: NEC Home Electronics Ltd
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Filing: 1988-10-27
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Granted: 1990-10-16
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Expires: 2008-10-27
Abstract
Abstract A navigation device which is mounted in a vehicle and in which the present location of the vehicle is presumed form the outputs from a direction sensor and movement distance sensor so that the presumed present location is displayed if it is coincident with a road map. In the navigation device, a present location presuming means is provided so that if there are a plurality of presumed present locations coincident with the road map, the locations are handled as actual present location candidates to serve as bases for the presumption of the present location of the vehicle until the propriety of the presumed present locations for actuality is negated by later presumption.
Inventors
- 👤 Hidemi Ohe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:45
CPC Classifications
G; G09; G09B; G09B29/00; G09B29/10; G09B29/106; G01; G01C; G01C21/00; G01C21/26; G01C21/28; G01C21/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
225 words
A navigation device mounted in a vehicle comprising: means for detecting a direction of said vehicle; means for detecting a movement distance of said vehicle; means for recording map information, said map information representing intersections as nodes; and control means for obtaining an updated presumed present location of said vehicle after said vehicle passes intersections, said control means comprising: means for presuming presumed present location candidates using detected directions and movement distances, said presumed present location candidates including a presumed present location, means for determining whether a plurality of presumed present location candidates exist that are within an allowable probability value after said vehicle passes first and subsequent intersections, means for identifying each of said plurality of presumed present location candidates as provisional presumed present locations after said vehicle passes said first and subsequent intersections, and means for establishing said updated presumed present location after passing one of said intersections comprising: means for setting said updated presumed present location as the presumed present location candidate if the presumed present location candidate was never identified as one of said plurality of provisional presumed present locations, and second means for setting said updated presumed present location as the presumed present location candidate that was identified as one of said plurality of provisional presumed present locations if another pretended present location of lesser error probability cannot be identified.
Claim 2
Dependent Claim
225 words
A navigation device mounted in a vehicle comprising: means for detecting a direction of said vehicle; means for detecting a movement distance of said vehicle; means for recording map information, said map information representing intersections as nodes; and control means for obtaining an updated presumed present location of said vehicle after said vehicle passes intersections, said control means comprising: means for presuming presumed present location candidates using detected directions and movement distances, said presumed present location candidates including a presumed present location, means for determining whether a plurality of presumed present location candidates exist that are within an allowable probability value after said vehicle passes first and subsequent intersections, means for identifying each of said plurality of presumed present location candidates as provisional presumed present locations after said vehicle passes said first and subsequent intersections, and means for establishing said updated presumed present location after passing one of said intersections comprising: means for setting said updated presumed present location as the presumed present location candidate if the presumed present location candidate was never identified as one of said plurality of provisional presumed present locations, and second means for setting said updated presumed present location as the presumed present location candidate that was identified as one of said plurality of provisional presumed present locations if another pretended present location of lesser error probability cannot be identified.
Claim 3
Dependent Claim
15 words
The navigation device of claim 1, wherein said vehicle direction detecting means comprises a hydroscope.
Claim 4
Dependent Claim
17 words
The navigation device of claim 1, wherein said vehicle direction detecting means comprises a terrestrial magnetism sensor.
Claim 5
Dependent Claim
17 words
The navigation device of claim 1, wherein said vehicle direction detecting means comprises a steering angle sensor.
Claim 6
Dependent Claim
16 words
The navigation device of claim 1, wherein said road map information recording means comprises a CD-ROM.
Claim 7
Dependent Claim
18 words
The navigation device of claim 1, further comprising a buffer memory means for storing said road map information.
Claim 8
Dependent Claim
209 words
A navigation method for a vehicle comprising the steps of: detecting a direction of said vehicle; detecting a movement distance of said vehicle; recording map information, said map information representing intersections as nodes; and obtaining an updated presumed present location of said vehicle after said vehicle passes intersections, said obtaining step comprising the steps of: presuming presumed present location candidates, including a presumed present location, using detected directions and movement distances, determining whether a plurality of presumed present location candidates exist that are within an allowable probability value, after said vehicle passes first and subsequent intersections, identifying each of said plurality of presumed present location candidates as provisional presumed present locations after said vehicle passes said first and subsequent intersections, and establishing said updated presumed present location after passing one of said intersections, said establishing step comprising the steps of: setting said updated presumed present location as the presumed present location candidate if the presumed present location candidate was never identified as one of said plurality of provisional presumed present locations, and setting said updated presumed present location as the presumed present location candidate that was identified as one of said plurality of provisional presumed present locations if another pretended present location of lesser error probability cannot be identified.
Claim 9
Dependent Claim
209 words
A navigation method for a vehicle comprising the steps of: detecting a direction of said vehicle; detecting a movement distance of said vehicle; recording map information, said map information representing intersections as nodes; and obtaining an updated presumed present location of said vehicle after said vehicle passes intersections, said obtaining step comprising the steps of: presuming presumed present location candidates, including a presumed present location, using detected directions and movement distances, determining whether a plurality of presumed present location candidates exist that are within an allowable probability value, after said vehicle passes first and subsequent intersections, identifying each of said plurality of presumed present location candidates as provisional presumed present locations after said vehicle passes said first and subsequent intersections, and establishing said updated presumed present location after passing one of said intersections, said establishing step comprising the steps of: setting said updated presumed present location as the presumed present location candidate if the presumed present location candidate was never identified as one of said plurality of provisional presumed present locations, and setting said updated presumed present location as the presumed present location candidate that was identified as one of said plurality of provisional presumed present locations if another pretended present location of lesser error probability cannot be identified.
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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) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |