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Vehicle navigation system for estimating energy consumption of route links

  • US 9,784,590 B2
  • Filed: 12/07/2015
  • Issued: 10/10/2017
  • Est. Priority Date: 09/08/2010
  • Status: Active Grant
First Claim
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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 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,wherein the sum or integral are a weighted sum or a weighted integral, respectively, in which the cosine or sine are weighted with a weighting factor depending on the angle of elevation (δ

    ), wherein a vehicle dependent grade resistance coefficient cG is used to weight the grade resistance attribute which is positive for positive angles of elevation, and for negative angles of elevation the grade resistance coefficient depends on whether the vehicle is a combustion engine powered vehicle or a hybrid or electric vehicle.

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