Method of selecting a transmission shift schedule
First Claim
1. A method for selecting a shift schedule for a transmission in a motor vehicle, the method comprising the steps of:
- determining whether a signal-to-noise ratio exceeds a threshold;
calculating a tractive effort of the motor vehicle;
estimating a vehicle mass and a road grade from the tractive effort using a recursive least squares estimator with multiple forgetting when the signal-to-noise ratio exceeds the threshold;
selecting a vehicle mass and estimating the road grade from the vehicle mass and tractive effort when the signal-to-noise ratio does not exceed the threshold; and
selecting a shift schedule based on the vehicle mass and the estimated road grade.
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0 Petitions
Accused Products
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.
27 Citations
16 Claims
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1. A method for selecting a shift schedule for a transmission in a motor vehicle, the method comprising the steps of:
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determining whether a signal-to-noise ratio exceeds a threshold; calculating a tractive effort of the motor vehicle; estimating a vehicle mass and a road grade from the tractive effort using a recursive least squares estimator with multiple forgetting when the signal-to-noise ratio exceeds the threshold; selecting a vehicle mass and estimating the road grade from the vehicle mass and tractive effort when the signal-to-noise ratio does not exceed the threshold; and selecting a shift schedule based on the vehicle mass and the estimated road grade. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification