×

Method and system for obtaining road grade data

  • US 6,847,887 B1
  • Filed: 03/04/2003
  • Issued: 01/25/2005
  • Est. Priority Date: 03/04/2003
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of obtaining data for a geographic database using a vehicle moving on roads in a geographic region comprising the steps of:

  • collecting data indicating engine load value and position of the vehicle as the vehicle travels in the geographic region;

    identifying a location of a road grade change point corresponding to a change in the engine load value data; and

    updating the geographic database to indicate the road grade change point.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×