Onboard road map display systems
First Claim
1. An onboard road map display system mounted on a vehicle, said display system comprising:
- a communicating means for performing road-vehicle communication to receive traffic information on traffic congestion on monitored roads in which traffic conditions are monitored a map storing means for storing map data representing a map of roads;
a map displaying means for displaying a road map around a current vehicle position of the vehicle and congested road sections;
a display mode selecting means for selecting one of a first display mode in which said monitored roads around said current vehicle position of the vehicle are displayed in a map together with unmonitored roads in which traffic conditions are not monitored, and a second display mode in which a map of only said monitored roads around the current vehicle position is displayed; and
a processing means for causing said map displaying means to display a road map image according to a selected one of said first and second display modes;
wherein said processing means comprises a discriminating means for discriminating between said monitored roads and said unmonitored roads by using one of said traffic information received by said communicating means and said map data stored in said map storing means.
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Accused Products
Abstract
A road map display system mounted on a vehicle for navigation guidance is arranged to discriminate monitored roads in which traffic conditions are monitored, from unmonitored roads, and to provide reliable information on traffic congestion to a driver of the vehicle. The road map display system includes a display device and a map image processor which controls the display device to display a road map image of the monitored roads distinguished from the unmonitored roads. Preferably, the display system includes a selector switch for selecting one of a normal display mode in which all roads are displayed around a current vehicle position, and a second display mode in which only the monitored roads are displayed with stepwise gradation to indicate degrees of congestion.
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Citations
15 Claims
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1. An onboard road map display system mounted on a vehicle, said display system comprising:
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a communicating means for performing road-vehicle communication to receive traffic information on traffic congestion on monitored roads in which traffic conditions are monitored a map storing means for storing map data representing a map of roads; a map displaying means for displaying a road map around a current vehicle position of the vehicle and congested road sections; a display mode selecting means for selecting one of a first display mode in which said monitored roads around said current vehicle position of the vehicle are displayed in a map together with unmonitored roads in which traffic conditions are not monitored, and a second display mode in which a map of only said monitored roads around the current vehicle position is displayed; and a processing means for causing said map displaying means to display a road map image according to a selected one of said first and second display modes; wherein said processing means comprises a discriminating means for discriminating between said monitored roads and said unmonitored roads by using one of said traffic information received by said communicating means and said map data stored in said map storing means. - View Dependent Claims (2)
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3. An onboard road map display system mounted on a vehicle, said display system comprising:
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a communicating means for receiving traffic data by performing road-vehicle communication, said traffic data comprising congestion data for discriminating a congested road section of monitored roads about which traffic information is available, from an uncongested road section of said monitored roads; a map displaying means for displaying road map images; a map storing means for storing map data representing a map of roads; and a first image processing means for discriminating said monitored roads comprising said congested road section and said uncongested road section and unmonitored roads about which traffic information is unavailable, and for causing said displaying means to display a road map image so that said monitored roads are distinguishable from said unmonitored roads, and said congested road section is distinguished from said uncongested road section; wherein said first image processing means comprises a discriminating means for discriminating between said monitored roads and said unmonitored roads by using one of said traffic data received by said communicating means and said map data stored in said map storing means. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. An onboard road map display system mounted on a vehicle, said display system comprising:
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a receiver for receiving traffic information by performing road-vehicle communication, said traffic information comprising a list of a plurality of traffic data sets each set comprising a first traffic data item for identifying a monitored road section in which a traffic condition is monitored, and a second traffic data item for indicating a degree of traffic congestion in said monitored road section; a sensor for determining a current vehicle position of said vehicle; a map storage device for storing map information representing a map of roads; a display device for displaying road map images; a display mode selector for selecting one of first and second road map display modes; and an image processor for reading a collection of map data items contained in the map information from said map storage device and causing siad display device to display a first mode road map image around said current vehicle position by using the collection of the map data items when said first road map display mode is selected by said display mode selector, and for processing the collection of the map data items in accordance with the traffic information received by said receiver and causing said display device to produce a second mode road map image when said second road map display mode is selected by said display mode selector, said display device responsive to said image processor when said first road map display mode is selected by displaying, in said first mode road map image, images of first, second and third road sections, said processor discriminating the first and second road sections, each of which is identified by one of said first traffic data items received by said receiver, from the third road section which is not identified by said first traffic data items, said display device responsive to said image processor when said second road map display mode is selected by displaying, in said second mode road map image, images of said first and second road sections with a visible display of a degree of traffic congestion in each of said first and second road sections. - View Dependent Claims (12, 13, 14, 15)
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Specification