Navigation system for vehicle
First Claim
1. A navigation system for a vehicle, the system comprising:
- a displaying means having a display screen;
a detecting means for detecting a present position and a heading direction of the vehicle;
a storing means for storing road map data for displaying a road map including a road, name of a road that is indicated by a plurality of line segments;
a display managing means for reading road map data from the storing means based on the detected present position, and displaying a peripheral road map and a vehicle mark indicating the present position and the heading direction of the vehicle such that the heading direction is shown upwardly in the display screen, whereinthe display managing means includes;
an angle calculating means for calculating, relative to a traveling road that the vehicle presently travels on, an intersecting angle of an extending direction of a cross road intersecting with the traveling road at an intersection;
a search area designating means for designating a search area shaped of a sector centering on the intersection to include the extending direction of the cross road;
an intersecting point retrieving means for determining and retrieving an arc intersecting point of the cross road at an outer circumference arc of the designated search area; and
a display position determining means for determining a display position of a road name of the cross road based on a line segment between the intersection and the retrieved arc intersecting point.
1 Assignment
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Accused Products
Abstract
A travel-estimated road, which a vehicle is estimated to travel, intersects with a cross road at an intersection. A search area shaped of a sector centering on the intersection is defined to have a central angle to include an extending direction of the cross road. An arc intersecting point is then defined where an outer circumference arc of the search area intersects with the cross road. A display position of the road name of the cross road on a road map is determined based on a line segment between the intersection and the arc intersecting point. Thus, the road name of the cross road can be displayed in a position, which is in proximity to the travel-estimated road so as to allow a user to clearly recognize that the displayed road name indicates the cross road irrespective of the configuration of the cross road.
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Citations
21 Claims
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1. A navigation system for a vehicle, the system comprising:
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a displaying means having a display screen; a detecting means for detecting a present position and a heading direction of the vehicle; a storing means for storing road map data for displaying a road map including a road, name of a road that is indicated by a plurality of line segments; a display managing means for reading road map data from the storing means based on the detected present position, and displaying a peripheral road map and a vehicle mark indicating the present position and the heading direction of the vehicle such that the heading direction is shown upwardly in the display screen, wherein the display managing means includes; an angle calculating means for calculating, relative to a traveling road that the vehicle presently travels on, an intersecting angle of an extending direction of a cross road intersecting with the traveling road at an intersection; a search area designating means for designating a search area shaped of a sector centering on the intersection to include the extending direction of the cross road; an intersecting point retrieving means for determining and retrieving an arc intersecting point of the cross road at an outer circumference arc of the designated search area; and a display position determining means for determining a display position of a road name of the cross road based on a line segment between the intersection and the retrieved arc intersecting point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A navigation system for a vehicle, the system comprising:
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a displaying means having a display screen; a detecting means for detecting a present position and a heading direction of the vehicle; a storing means for storing road map data for displaying a road map including a road name of a road, the road being indicated by a plurality of line segments; and a display managing means for reading road map data from the storing means based on the detected present position, displaying a peripheral road map and a vehicle mark indicating the present position and the heading direction such that the heading direction is shown upwardly in the display screen, and displaying a road name of a cross road, which intersects at an intersection with a traveling road, at a position in proximity to the cross road such that the road name of the cross road, does not overlap with the traveling road, the display managing means being further configured to include a display position determining means for determining a display position of the road name of the cross road only through an intersecting angle defined as an angle formed at the intersection between (i) the cross road and (ii) a road portion of the traveling road directly entering the intersection, the road portion being between the present position of the vehicle and the intersection, and the display position determining means determining the display position of the road name of the cross road (i) at a lower side of the cross road when the intersecting angle exceeds a predetermined maximum angle, and (ii) at an upper side of the cross road when the intersecting angle does not exceed the predetermined maximum angle. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A navigation system for a vehicle, the system comprising:
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a displaying device having a display screen; a position detection device that detects a present position and a heading direction of the vehicle; a storage device that stores road map data for displaying a road map including a road name of a road that is indicated by a plurality of line segments, the road name presented by a string of a plurality of characters; a display managing portion that reads road map data from the storage device based on the detected present position, and displaying a peripheral road map and a vehicle mark indicating the present position and the heading direction of the vehicle such that the heading direction is shown upwardly in the display screen, wherein the display managing portion includes; an angle calculating unit to calculate, relative to a traveling road, which is estimated for the vehicle to travel, an intersecting angle of an extending direction of a cross road intersecting with the traveling road at an intersection; an intersecting point retrieving unit to retrieve an arc intersecting point, which is one point found between the cross road and an outer circumference arc of a sector-shaped area by designating the sector-shaped area as centering on the intersection to include the extending direction of the cross road and as having a radius that enables finding of the arc intersecting point; and a display position determining unit to determine a display position of a road name of the cross road based on a line segment between the intersection and the retrieved arc intersecting point, wherein; the display position of the string of the plurality of characters of the road name of the cross road is determined to be separated from and in parallel with the line segment between the intersection and the retrieved arc intersecting point; and the string of the plurality of characters of the road name of the cross road as well as the cross road containing the arc intersecting point is visible in the displayed peripheral road map whereas the line segment between the intersection and the retrieved arc intersecting point is invisible in the displayed peripheral road map. - View Dependent Claims (20, 21)
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Specification