US5262775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Navigation system with off-route detection and route recalculation
Assignee: TomTom International BV
•
Filing: 1992-04-07
•
Granted: 1993-11-16
•
Expires: 2012-04-07
Abstract
Abstract Where a vehicle deviates from a calculated optimal route, the system displays a message indicating the vehicle's deviation. The driver of the vehicle commands computation of a new optimum route. The system selects a new starting point from a point substantially ahead of the vehicle, recomputes the optimal route, and determines the route from the new starting point to the destination. The new starting point is far enough ahead of the vehicle to ensure that the route computation is completed before the vehicle reaches it. This prevents overrunning the new starting point before the calculation of a new optimum route is completed. Navigation guidance, computed for the new optimal route, is then displayed.
Inventors
- 👤 Haruhisa Tamai
- 👤 Tatsuhiko Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:25
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/26; G01C21/34; G01C21/3407; G01C21/3415
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
169 words
A vehicle navigation system, which comprises: means for storing and retrieving a plurality of map data; a shaft sensor; a terrestrial magnetism sensor; said shaft sensor and said terrestrial magnetism sensor cooperating to detect a present location of a vehicle; a microcomputer for computing from said map data an optimal route for said vehicle from a starting point to a destination; said shaft sensor, said terrestrial magnetism sensor, and said microcomputer cooperating to detect a deviation of said vehicle from said optimal route; a display disposed to convey information that said vehicle has deviated from said optimal route; means for commanding computation of a route; said means for storing and retrieving and said microcomputer cooperating, in response to said means for commanding, to determine a geographic point separated a predetermined distance from said vehicle's present location and ahead of said vehicle; said geographic point providing a new starting point for a calculation of a new optimal route; and said microcomputer communicating navigation guidance to said display for presentation thereon.
Claim 2
Dependent Claim
169 words
A vehicle navigation system, which comprises: means for storing and retrieving a plurality of map data; a shaft sensor; a terrestrial magnetism sensor; said shaft sensor and said terrestrial magnetism sensor cooperating to detect a present location of a vehicle; a microcomputer for computing from said map data an optimal route for said vehicle from a starting point to a destination; said shaft sensor, said terrestrial magnetism sensor, and said microcomputer cooperating to detect a deviation of said vehicle from said optimal route; a display disposed to convey information that said vehicle has deviated from said optimal route; means for commanding computation of a route; said means for storing and retrieving and said microcomputer cooperating, in response to said means for commanding, to determine a geographic point separated a predetermined distance from said vehicle's present location and ahead of said vehicle; said geographic point providing a new starting point for a calculation of a new optimal route; and said microcomputer communicating navigation guidance to said display for presentation thereon.
Claim 3
Dependent Claim
19 words
A vehicle navigation system according to claim 1, wherein said means for storing and retrieving includes a CD ROM.
Claim 4
Dependent Claim
19 words
A vehicle navigation system according to claim 1, wherein said means for storing and retrieving includes an IC card.
Claim 5
Dependent Claim
18 words
A vehicle navigation system according to claim 1, wherein said means for commanding includes a touch screen switch.
Claim 6
Dependent Claim
14 words
A vehicle navigation system according to claim 1, wherein said display includes a CRT.
Claim 7
Dependent Claim
14 words
A vehicle navigation system according to claim 1, wherein said display includes an LCD.
Claim 8
Dependent Claim
48 words
Apparatus according to claim 1, wherein said predetermined distance is sufficient, for a present speed of said vehicle, to permit completion of computation of said new optimum route before said geographic point is reached, whereby said vehicle will not overrun said geographic point before said completion of computation.
References Cited (Backward Citations)
US4763270A
Cited
US4992947A
Cited
US5043902A
Cited
US5115399A
Cited
US4954959A
Cited
US5031104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |