Navigation system and method for guiding a road vehicle
First Claim
1. A method for guiding a driver of a road vehicle along a route, the method comprising the steps of:
- planning the route between a current position and a destination, the route comprising a number of road-elements,during travel of the vehicle along a planned route, receiving and decoding a traffic message and therefrom deriving an actual travel condition of a particular road-element to which the message is directed,evaluating whether replanning the route is required, which evaluation comprises detecting whether the actual travel condition indicates a problem relating to one of the road-elements on the route to the destination and if this is the case then deciding to replan the route,in case of a positive decision, replanning the route between the current travel position and the destination,maintaining a list of travel conditions from received traffic messages directed to road-elements in a relevance region, andin the case where the traffic message relates to a particular road-element which is off the planned route, the evaluation comprises detecting whether the actual travel condition message indicates an improvement in the particular off-route road element, and if this is the case then deciding to replan the route.
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Accused Products
Abstract
In a navigation system a driver of a vehicle is guided along a planned route (310) from an origin to a destination. The system comprises a receiver (122) for receiving a traffic message of an actual travel condition concerning a road-element. The system comprises an evaluation module (126) to determine whether the received traffic message makes it necessary to plan a new route to the destination. If a traffic message is received for a road-element which does not form a part of the planned route (212), the evaluation module determines whether the message indicates an improvement (204) of the travel condition of that road-element and if this is so then the planning module plans a new route.
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Citations
20 Claims
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1. A method for guiding a driver of a road vehicle along a route, the method comprising the steps of:
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planning the route between a current position and a destination, the route comprising a number of road-elements, during travel of the vehicle along a planned route, receiving and decoding a traffic message and therefrom deriving an actual travel condition of a particular road-element to which the message is directed, evaluating whether replanning the route is required, which evaluation comprises detecting whether the actual travel condition indicates a problem relating to one of the road-elements on the route to the destination and if this is the case then deciding to replan the route, in case of a positive decision, replanning the route between the current travel position and the destination, maintaining a list of travel conditions from received traffic messages directed to road-elements in a relevance region, and in the case where the traffic message relates to a particular road-element which is off the planned route, the evaluation comprises detecting whether the actual travel condition message indicates an improvement in the particular off-route road element, and if this is the case then deciding to replan the route. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A navigation system for guiding a driver of a road vehicle along a route, the system comprising:
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a planning module for planning the route between a current position and a destination, the route comprising a number of road-elements, a receiver for receiving and decoding a traffic message and therefrom deriving an actual travel condition of a particular road-element to which the message is directed, an evaluation module for evaluating whether replanning the route is required, wherein the evaluation module is arranged to detect whether the actual travel condition indicates a problem relating to one of the road-elements on the route to the destination and if this is the case then to decide to replan the route, wherein the system is arranged to maintain a list of travel conditions from received traffic messages directed to road-elements in a relevance region, and the evaluation module is arranged to detect, in the case where the particular road-element is off the route, whether the actual travel condition indicates an improvement and if so then to decide to replan the route. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for guiding a road vehicle along a route to a destination point, which comprises:
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planning the route between a current vehicle position and the destination point, the route comprising a number of road-elements, during travel of the vehicle along a planned route, receiving and decoding a traffic message and deriving therefrom an actual travel condition of a particular road-element to which the message is directed, evaluating whether replanning the route is required on the basis of a received traffic message relating to a road-element on the route to the destination point, if the traffic message indicates a deterioration of the road-element on the route to the destination point, then replanning the route between the current vehicle travel position and the destination point, maintaining a list of travel conditions from received traffic messages directed to road-elements in a relevance region, and during travel along a planned route, if a received traffic message relates to a particular off the route road-element within the relevance region, evaluating whether or not an improvement occurred in the particular off the route road-element, and if so, then replanning for an optimal route from the current vehicle position to the destination point. - View Dependent Claims (19, 20)
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Specification