Reducing oscillations in a motor vehicle driveline
First Claim
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1. A method for reducing oscillations in a vehicle driveline, comprising:
- (a) reducing torque transmitted to secondary wheels in proportion to first and second rates of change in a difference between a speed of the secondary wheels and primary wheels;
(b) if a rate of said change is less than a rate of said change during a previous sampling interval, using differential and proportional control to change said torque.
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Abstract
A method for reducing oscillations in a vehicle driveline includes transmitting torque to secondary wheels of the vehicle, determining a first rate of change in speed between the secondary wheels and primary wheels, if a second rate of change in speed between secondary wheels and primary wheels is greater than the first rate of change, reducing torque transmitted to the secondary wheels proportional to a ratio of the first rate of change and the second rate of change, and if the second rate of change is less than the first rate of change, using differential and proportional control to change said torque.
20 Citations
18 Claims
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1. A method for reducing oscillations in a vehicle driveline, comprising:
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(a) reducing torque transmitted to secondary wheels in proportion to first and second rates of change in a difference between a speed of the secondary wheels and primary wheels; (b) if a rate of said change is less than a rate of said change during a previous sampling interval, using differential and proportional control to change said torque. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for reducing oscillations in a vehicle driveline, comprising:
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(a) transmitting torque to secondary wheels of a vehicle; (b) determining a first rate of change between an average speed of the secondary wheels and an average speed of primary wheels; (c) if a second rate of change between the average speed of the secondary wheels and the average speed of the primary wheels is greater than the first rate of change, reducing the torque transmitted to the secondary wheels proportional to a ratio of the first rate of change and the second rate of change; (d) if the second rate of change is less than the first rate of change, using differential and proportional control to change said torque. - View Dependent Claims (8, 9, 10)
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11. A system for controlling a vehicle driveline, comprising:
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primary wheels and secondary wheels; a clutch for transmitting torque to the secondary wheels; a controller configured to determine a first rate of change in speed between the secondary wheels and the primary wheels;
reduce said torque in proportion to a ratio of the first rate of change and a second rate of change, if a second rate of change in speed between the secondary wheels and the primary wheels is greater than the first rate of change; and
use differential and proportional control to change said torque, if the second rate of change is less than the first rate of change. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification