VEHICLE NAVIGATION SYSTEM
First Claim
1. A vehicle navigation system, comprising:
- a database configured to store map data having links corresponding to road segments and attributes associated with the links, the map data having at least some links associated with a curvature attribute and a mean absolute curvature () stored for the curvature attribute for corresponding links, the mean absolute curvature () being determined from a normalized sum or integral of absolute curvature values along the road segment corresponding to the link;
a processing unit configured to estimate an energy consumption of the vehicle for a link using the curvature attribute retrieved from the database for the link.
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Accused Products
Abstract
A vehicle navigation system having a database configured to store map data. The database includes links corresponding to road segments and attributes associated with the links. The map data includes at least some links associated with a curvature attribute. A mean absolute curvature (
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Citations
22 Claims
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1. A vehicle navigation system, comprising:
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a database configured to store map data having links corresponding to road segments and attributes associated with the links, the map data having at least some links associated with a curvature attribute and a mean absolute curvature () stored for the curvature attribute for corresponding links, the mean absolute curvature () being determined from a normalized sum or integral of absolute curvature values along the road segment corresponding to the link; a processing unit configured to estimate an energy consumption of the vehicle for a link using the curvature attribute retrieved from the database for the link. - View Dependent Claims (2, 3, 4, 5)
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6. A vehicle navigation system, comprising:
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a database configured to store map data having links corresponding to road segments and attributes associated with the links, the map data having at least some links associated with a rolling resistance attribute and a grade resistance attribute, the rolling resistance attribute for a link having a rolling resistance attribute value (gcos) proportional to a sum or an integral over the cosine of the angles of elevation (δ
) along the road segment, the grade resistance attribute for a link having a grade resistance attribute value (gsin) proportional to a sum or an integral over the sine of the angles of elevation (δ
) along the road segment;a processing unit configured to estimate an energy consumption of the vehicle for a link using at least one of the rolling resistance attribute and the grade resistance attribute retrieved from the database for the link. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of estimating an energy consumption of a vehicle for a link of a route, the method comprising:
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retrieving at least one link corresponding to a road segment from a database of map data; retrieving a curvature attribute associated with the retrieved link from the database, the curvature attribute for the link storing a mean absolute curvature () determined from a normalized sum or integral of absolute curvature values along the road segment corresponding to the link; and estimating an energy consumption of the vehicle for the link using the retrieved curvature attribute.
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14. A method of estimating an energy consumption of a vehicle for a link of a route, the method comprising:
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retrieving at least one link corresponding to a road segment from a database of map data; retrieving at least one of a rolling resistance attribute and a grade resistance attribute associated with the retrieved link from the database, the rolling resistance attribute for a link storing a value (gcos) proportional to a sum or an integral over the cosine of the angles of elevation along the road segment, the grade resistance attribute for a link storing a value (gsin) proportional to a sum or an integral over the sine of the angles of elevation along the road segment; and estimating an energy consumption of the vehicle for the link using the retrieved rolling resistance attribute or grade resistance attribute.
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15. A vehicle navigation system comprising:
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a processing unit; a database of map data having links corresponding to road segments and attributes associated with the links, the map data having at least some links associated with a curvature attribute; and a memory for storing software components configured to perform, when executed by the processor, the following; retrieving at least one link corresponding to a road segment from the database of map data; retrieving a curvature attribute associated with the retrieved link from the database, the curvature attribute for the link storing a mean absolute curvature () determined from a normalized sum or integral of absolute curvature values along the road segment corresponding to the link; and estimating an energy consumption of the vehicle for the link using the retrieved curvature attribute.
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16. A vehicle navigation system comprising:
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a processing unit; a database of map data having links corresponding to road segments and attributes associated with the links, the map data having at least some links associated with a rolling resistance attribute and a grade resistance attribute; and a memory for storing software components configured to perform, when executed by the processor, the following; retrieving at least one link corresponding to a road segment from the database of map data; retrieving at least one of a rolling resistance attribute and a grade resistance attribute associated with the retrieved link from the database, the rolling resistance attribute for a link storing a value (gcos) proportional to a sum or an integral over the cosine of the angles of elevation along the road segment, the grade resistance attribute for a link storing a value (gsin) proportional to a sum or an integral over the sine of the angles of elevation along the road segment; and estimating an energy consumption of the vehicle for the link using the retrieved rolling resistance attribute or grade resistance attribute.
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17. A computer-readable storage medium having computer programs configured to perform, when executed by a processor, the following:
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retrieving at least one link corresponding to a road segment from the database of map data having links corresponding to road segments and attributes associated with the links, the map data having at least some links associated with a curvature attribute; retrieving a curvature attribute associated with the retrieved link from the database, the curvature attribute for the link storing a mean absolute curvature () determined from a normalized sum or integral of absolute curvature values along the road segment corresponding to the link; and estimating an energy consumption of the vehicle for the link using the retrieved curvature attribute.
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18. A computer-readable storage medium having computer programs configured to perform, when executed by a processor, the following:
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retrieving at least one link corresponding to a road segment from a database of map data having links corresponding to road segments and attributes associated with the links, the map data having at least some links associated with a rolling resistance attribute and a grade resistance attribute; retrieving at least one of a rolling resistance attribute and a grade resistance attribute associated with the retrieved link from the database, the rolling resistance attribute for a link storing a value (gcos) proportional to a sum or an integral over the cosine of the angles of elevation along the road segment, the grade resistance attribute for a link storing a value (gsin) proportional to a sum or an integral over the sine of the angles of elevation along the road segment; and estimating an energy consumption of the vehicle for the link using the retrieved rolling resistance attribute or grade resistance attribute.
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19. A method of generating a database comprising map data for a navigation system, the method comprising:
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for a link of the map data, retrieving curvature values giving information on the curvature along a road segment corresponding to the link; determining a mean absolute curvature for the link by determining a normalized sum or integral of the absolute curvature values along the road segment corresponding to the link; and storing the mean absolute curvature as a curvature attribute in association with the link in the database. - View Dependent Claims (20)
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21. A method of generating a database comprising map data for a navigation system, the method comprising:
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for a link of the map data, retrieving angles of elevation giving information on the incline along a road segment corresponding to the link; determining a first value proportional to a sum or an integral over the cosine of the angles of elevation along the road segment and a second value proportional to a sum or an integral over the sine of the angles of elevation along the road segment; and storing the first value as a rolling resistance attribute and the second value as a grade resistance attribute in association with the link. - View Dependent Claims (22)
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Specification