Vehicle route guidance apparatus for reseaching for a route when vehicle goes out of route
First Claim
1. A vehicle bearing detection system installed on a vehicle for detecting a bearing of the vehicle, comprising:
- a plurality of bearing detectors for individually detecting the bearing of the vehicle; and
a switching apparatus for carrying out switching operations to selectively output detection signals from the plurality of bearing detectors as the vehicle bearing responsive to a determination that the vehicle is traveling along a straight line.
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Accused Products
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.
49 Citations
14 Claims
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1. A vehicle bearing detection system installed on a vehicle for detecting a bearing of the vehicle, comprising:
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a plurality of bearing detectors for individually detecting the bearing of the vehicle; and a switching apparatus for carrying out switching operations to selectively output detection signals from the plurality of bearing detectors as the vehicle bearing responsive to a determination that the vehicle is traveling along a straight line. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicle bearing detection system for detecting bearing of a vehicle comprising:
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A Global Positioning System receiver for receiving position information from artificial satellites; A Global Positioning System bearing detector for detecting a bearing of the vehicle from a Doppler shift contained in output signals from the Global Positioning System receiver; a map information memory for storing map information including road bearing; and a map bearing detector for detecting the road bearing at a current position of the vehicle which is determined based on the received signals from the Global Positioning System receiver, to detect the bearing of the vehicle; a switching means for carrying out switching operations to selectively output detection signals from the two bearing detectors as the vehicle bearing responsive to a determination that the vehicle is traveling along a straight line;
whereinthe bearing of the vehicle being finally detected on a basis of both an output from the Global Positioning System bearing detector and an output from the map bearing detector. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A vehicle bearing detection system installed on a vehicle for detecting a bearing of the vehicle, comprising:
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a plurality of bearing detectors for individually detecting the bearing of the vehicle; one of the plurality of bearing detectors detecting a Doppler shift in received signals from a Global Positioning System receiver for receiving a signal from an artificial satellite to determine the bearing of the vehicle; and a switching apparatus that adopts an output of the Global Positioning System receiver as an actual bearing of the vehicle and corrects an output of at least one of the other bearing detectors using the actual bearing of the vehicle determined by the Global Positioning System receiver responsive to a determination that the vehicle is traveling along a straight line. - View Dependent Claims (14)
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Specification