Vehicular navigation system
AssigneeDenso Corporation
InventorsKenji Takashima, Wataru Sugiura
Life of this patent
Estimating the term…
Abstract
With respect to a connection road linked with a rotary included in a guidance route, a vehicular navigation system acquires a dummy link that is defined to extend towards an inside of the rotary based on road map data. An advancing direction at the rotary is computed by using an angle defined by two dummy links with respect to both an entering road being the connection road on which the vehicle is to approach the rotary and an exiting road being the connection road on which the vehicle is to recede from the rotary. Guidance information at the rotary is outputted based on the computed advancing direction when the vehicle approaches the rotary.
Claims16
A navigation system in a vehicle, the system comprising:
- a position detector for detecting a current position of the vehicle;
- a map data storage unit for storing road map data indicating a road by links;
- a route designating unit for designating a guidance route to a destination based on the road map data;
- and
- a navigating unit for indicating an advancing direction, in which the vehicle should advance at a guidance target included in the guidance route, when the current position approaches the guidance target, wherein
- the road map data includes a dummy link defined by linking a center of a rotary with an end point of a connection road link that is connected at the end point with a rotary link having an attribute associated with the rotary, and
- when a rotary is the guidance target,
- the navigating unit
- designates (i) a first dummy link linked with a connection road link corresponding to a guidance route entering the rotary and (ii) a second dummy link linked with a connection road link corresponding to a guidance route exiting from the rotary, and
- indicates an advancing direction of the vehicle at the rotary based on an angle difference between the first dummy link and the second dummy link.
A navigation system that is provided in a vehicle and includes a function of retrieving a guidance route from a start point to a destination, the system comprising:
- a position detector for obtaining a current position of the vehicle;
- a map data obtaining unit for obtaining map data;
- an outputting unit for outputting information for navigating;
- an advancing direction computing unit for computing an advancing direction at a rotary included in the guidance route based on the map data when the current position approaches the rotary;
- and
- a navigation control unit for outputting, to the outputting unit, guidance information based on the computed advancing direction, wherein
- the advancing direction computing unit computes
- a straight line including both (i) a connecting point connected with the rotary and (ii) a given point by a given distance away from the connecting point, with respect to each of an entering road to the rotary and an exiting road exiting from the rotary,
- an angle formed by two straight lines with respect to the entering road and the exiting road, and
- an advancing direction at the rotary based on the computed angle.
A navigation system that is provided in a vehicle and includes a function of retrieving a guidance route from a start point to a destination, the system comprising:
- a position detector for obtaining a current position of the vehicle;
- a map data obtaining unit for obtaining map data;
- an outputting unit for outputting information for navigating;
- an advancing direction computing unit for computing an advancing direction at a rotary included in the guidance route based on the map data when the current position approaches the rotary;
- and
- a navigation control unit for outputting, to the outputting unit, guidance information based on the computed advancing direction, wherein
- the advancing direction computing unit computes
- an extended line extended in a road direction of the given point that is by a given distance away from a connecting point connected with the rotary, with respect to each of an entering road to the rotary and an exiting road exiting from the rotary,
- an angle formed by extended lines with respect to the entering road and the exiting road, and
- an advancing direction at the rotary based on the computed angle.
A navigation system in a vehicle for navigating along a guidance route to a destination, the system comprising:
- a position detector for detecting a current position of the vehicle;
- a dummy link acquiring unit for acquiring a dummy link with respect to a connection road linked with a rotary included in the guidance route, the dummy link being defined to extend towards an inside of the rotary based on road map data;
- an advancing direction computing unit for computing an advancing direction at the rotary by using an angle defined by two dummy links with respect to both (i) an entering road being the connection road on which the vehicle is to approach the rotary and (ii) an exiting road being the connection road on which the vehicle is to recede from the rotary;
- and
- a navigating unit for indicating guidance information at the rotary based on the computed advancing direction when the current position of the vehicle approaches the rotary.
Dependencies are inferred from the claim text.