Vehicle navigation system

摘要

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 ( κ) is stored for the curvature attribute for corresponding links. The mean absolute curvature ( κ) may be determined from a normalized sum or integral of absolute curvature values along the road segment corresponding to the link. The system includes 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.

主权项

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 ( κ) stored for the curvature attribute for corresponding links, the mean absolute curvature ( κ) being determined from a normalized sum or integral of absolute curvature values along the road segment corresponding to the link; and a processing unit configured to estimate an energy consumption cost factor of the vehicle for a link using the curvature attribute retrieved from the database for the link, and using at least one of (i) vehicle velocity (ii) driver vehicle operating behavior (iii) vehicle fuel consumption (iv) vehicle coefficient of drag or (v) vehicle rolling resistance coefficient or (vi) grade resistance coefficient, where the sum or the integral are a weighted sum or a weighted integral in which the curvature values are weighted by a weighting factor, and where the weighting factor is configured to consider the influence of the curvature on energy consumption.