Vehicle route guidance apparatus for researching for a route when vehicle goes out of route
First Claim
1. A vehicle navigation system for informing a driver of a vehicle of a current position of the vehicle, comprising:
- a current position detector for detecting a current position of the vehicle on a first road;
a map information memory for storing information concerning road positions;
an adjacent road detector for detecting whether a second road adjacent to the first road on which the detected current position of the vehicle is located exists based on the current position of the vehicle detected from the current position detector and road information obtained from the map information storage,wherein the detection result of the adjacent road detector is used for specifying the current position of the vehicle.
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Abstract
A route guidance section compares the current position provided by a current position determination section and the route provided by a route calculation section for detecting an off-route condition. When the off-route condition is detected, a re-searching key as well as the route and current place is displayed on a display section. When the re-searching key is touched, a search is again made for a new route from the current position to the destination. Then, route guidance is again started in response to the re-searching result. When the re-searching key is not touched, the route and current place continue to be displayed while the vehicle carrying the apparatus travles off route, thereby efficiently preventing the apparatus from executing unnecessary re-searching when the driver drives the vehicle off route on purpose.
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Citations
9 Claims
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1. A vehicle navigation system for informing a driver of a vehicle of a current position of the vehicle, comprising:
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a current position detector for detecting a current position of the vehicle on a first road; a map information memory for storing information concerning road positions; an adjacent road detector for detecting whether a second road adjacent to the first road on which the detected current position of the vehicle is located exists based on the current position of the vehicle detected from the current position detector and road information obtained from the map information storage, wherein the detection result of the adjacent road detector is used for specifying the current position of the vehicle. - View Dependent Claims (2, 3, 4)
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5. A vehicle navigation system for providing route guidance along a predetermined route, comprising:
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a current position detection means for detecting a current position of the vehicle; a re-search commanding means for commanding a re-search of a route from the current position to a destination; an adjacent road detection means for detecting whether a road adjacent to the road on which the detected current position is located exists, responsive to the re-search commanding means issuing a re-search; a current position changing means for changing a specified current position of the vehicle to a corresponding position on the adjacent road responsive to the adjacent road detecting means detecting the presence of the adjacent road. - View Dependent Claims (6)
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7. A vehicle navigation system for informing a driver of a vehicle of the current position of the vehicle, comprising:
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a current position detecting means for detecting a current position of the vehicle on a first road; a current position check commanding means for externally commanding a check concerning the detected current position of the vehicle; an adjacent road detection means for detecting whether a second road adjacent to the first road on which the detected current position is located exists responsive to the current position check commanding means issuing a check of the detected current position; a current position information output means for outputting information concerning the first road on which the detected current position is located, responsive to the adjacent road detecting means detecting the presence of the adjacent second road; wherein the second road detection result is for use in specifying the current position. - View Dependent Claims (8, 9)
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Specification