Navigation apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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May 11, 1999
Grant Date -
N/A
app pub date -
Oct 16, 1996
filing date -
Dec 28, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A navigation apparatus is provided which can search out, even if a vehicle goes off of a guide route, a route which allows the vehicle to return to the guide route so that the travel distance to a destination may be comparatively short. A guide route control unit calculates, when the vehicle is in an off-route condition, rectilinear distances from a vehicle position to nodes on the guide route and route distances from the nodes to the destination along the guide route. The control unit modifies the rectilinear distances and the route distances using first and second weighting coefficients, respectively, which are set so that the second weighting coefficient is greater than the first weighting coefficient, and calculates sums of the rectilinear and route distances modified with the first and second weighting coefficients, respectively. The control unit then determines one of the nodes which exhibits the lowest one of the sums as a return point, and searches for a route from the vehicle position to the return point. The navigation apparatus guides the vehicle to the return point along the route thus searched out.
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