Road map display system with indication of a vehicle position
First Claim
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1. A road map display system for an automotive vehicle comprising:
- a first memory storing road map data, said road map data defined on a first coordinate system;
a sensor detecting displacement of the vehicle from a starting point and producing a first signal representative of vehicle orientation and position with respect to said first coordinate system;
a scale selector responsive to said first signal for monitoring vehicle position and adjusting the scale of the map when the vehicle is within a predetermined distance of a preselected point on the map, said selector producing a second signal representative of the selected scale;
means for transforming said map data in said first memory in response to said first and second signals for producing map data defined on a second coordinate system and for centering said transformed map data about said vehicle position;
a second memory for storing said transformed map data; and
a display unit for displaying at least part of the contents of said second memory and having on said second coordinate system a mark representing the position of the vehicle.
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Abstract
A road map display system for an automotive vehicle displays a mark representative of a vehicle'"'"'s position and direction. The mark is positioned at the center of a display screen and the coordinate system of the map is transformed depending on the vehicle'"'"'s direction so that the mark indicative of the direction is always directed upward along the y-axis of the display. The system further includes a scale selector which is manually operable. Depending on the selected map scale, the displayed map is magnified or reduced.
123 Citations
13 Claims
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1. A road map display system for an automotive vehicle comprising:
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a first memory storing road map data, said road map data defined on a first coordinate system; a sensor detecting displacement of the vehicle from a starting point and producing a first signal representative of vehicle orientation and position with respect to said first coordinate system; a scale selector responsive to said first signal for monitoring vehicle position and adjusting the scale of the map when the vehicle is within a predetermined distance of a preselected point on the map, said selector producing a second signal representative of the selected scale; means for transforming said map data in said first memory in response to said first and second signals for producing map data defined on a second coordinate system and for centering said transformed map data about said vehicle position; a second memory for storing said transformed map data; and a display unit for displaying at least part of the contents of said second memory and having on said second coordinate system a mark representing the position of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for displaying a road map with an indication of vehicle position on said road map on a display screen, comprising the steps of:
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storing first map data of said road map with respect to a first coordinate system; detecting vehicle position and orientation in relation to said first coordinate system and producing a first signal representative of the vehicle coordinates in said first coordinate system; selecting a scale for the map to be displayed on said display screen in accordance with the distance between the vehicle and a preselected point on said road map; transforming said first map data with respect to a second coordinate system, said second coordinate system being aligned with the vehicle orientation and centered on the vehicle position, to obtain second map data; transforming said second map data with respect to said selected scale to obtain third map data; and displaying said third map data on said display screen with a vehicle position indication. - View Dependent Claims (10, 11, 12, 13)
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Specification