Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
John P. Kresse0
Date of Patent
March 3, 2009
0Patent Application Number
117331640
Date Filed
April 9, 2007
0Patent Primary Examiner
Patent abstract
A method for selecting a shift schedule for a transmission in a motor vehicle is provided. The method includes the steps of determining whether a signal-to-noise ratio exceeds a threshold and calculating a tractive effort of the motor vehicle. A vehicle mass and a road grade is then estimated from the tractive effort using a recursive least squares estimator with multiple forgetting when the signal-to-noise ratio exceeds the threshold. A vehicle mass is selected and the road grade estimated from the vehicle mass and tractive effort when the signal-to-noise ratio does not exceed the threshold. A shift schedule is then selected based on the vehicle mass and the estimated road grade.
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