Vehicle navigation apparatus and storage medium
First Claim
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1. A vehicle navigation apparatus for providing guidance comprising:
- search means for searching to predetermine a route to a destination from a starting location or a present position;
off-route recognition means for recognizing deviations of the vehicle from current guidance;
selecting means for selecting between a re-search, in a first mode, of road data limited to a limited area closely surrounding a detected present position of the vehicle to determine a return route for return to the predetermined route and, responsive to a predetermined plural number of said deviations, a re-search in a second mode of second road data covering a wide area greater than said limited area, said wide area extending from the detected present position to the destination, to determine a new route from the detected present position to the destination;
re-search means for conducting a re-search in the mode selected by said selection means; and
guidance means for outputting guidance in accordance with the predetermined route, the return route and the new route.
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Abstract
A navigation apparatus reduces route search time while providing guidance in conformity with drivers'"'"' preferences, by selectively conducting either a full-range route search or a more limited, local area search, in accordance with detected conditions and responsive to occurrence of an off-route event. For example, the full-range route search is conducted pursuant to a determination that the vehicle has gone straight at a predetermined number of certain intersections where current guidance has directed a turn.
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Citations
12 Claims
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1. A vehicle navigation apparatus for providing guidance comprising:
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search means for searching to predetermine a route to a destination from a starting location or a present position; off-route recognition means for recognizing deviations of the vehicle from current guidance; selecting means for selecting between a re-search, in a first mode, of road data limited to a limited area closely surrounding a detected present position of the vehicle to determine a return route for return to the predetermined route and, responsive to a predetermined plural number of said deviations, a re-search in a second mode of second road data covering a wide area greater than said limited area, said wide area extending from the detected present position to the destination, to determine a new route from the detected present position to the destination; re-search means for conducting a re-search in the mode selected by said selection means; and guidance means for outputting guidance in accordance with the predetermined route, the return route and the new route. - View Dependent Claims (2, 3)
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4. A vehicle navigation apparatus comprising:
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present position detection means for detecting a present position of the vehicle; search means for searching to predetermine a route to a destination from a starting location or the detected present position; off-route recognition means for recognizing a condition wherein the vehicle has deviated from current guidance; off-route criterion judgement means for judging whether or not the recognized condition satisfies a predetermined criterion; selecting means for selecting, in accordance with said judgement, between a re-search in a first mode of road data limited to a limited area closely surrounding a detected present position of the vehicle to determine a return route for return to the predetermined route and a re-search in a second mode of second road data covering a wide area greater than said limited area, said wide area extending from the detected present position to the destination, to determine a new route from the detected present position to the destination; re-search means for conducting a re-search in the mode selected by said selection means; and guidance means for outputting guidance in accordance with the predetermined route, the return route and the new route. - View Dependent Claims (5, 6, 7, 8)
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9. A storage medium having encoded thereon a program for execution of a routine comprising:
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searching to predetermine a route to a destination from a starting location or a present position; recognizing a condition wherein the vehicle has deviated from current guidance; judging whether or not the recognized condition satisfies a predetermined criterion; selecting, in accordance with said judgement, between a re-search in a first mode of road data limited to a limited area closely surrounding a detected present position of the vehicle to determine a return route for return to the predetermined route and a re-search in a second mode of second road data covering a wide area greater than said limited area, said wide area extending from the detected present position to the destination, to determine a new route from the detected present position to the destination; conducting a re-search in the mode selected by said selection means; and outputting guidance in accordance with the predetermined route, the return route and the new route. - View Dependent Claims (10, 11, 12)
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Specification