Active Damping Tip-In Clutch Control of a Vehicle Transmission

• US 20120312657A1
• Filed: 06/09/2011
• Published: 12/13/2012
• Est. Priority Date: 06/09/2011
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Jiang, Hong, Shelton, Matthew J., Dai, Zhengyu, Hrovat, Davor D., Riedle, Bradley D., McDonnell, Alexander P.
• Granted Patent: US 8,550,961 B2
• Time in Patent Office: Days
• US Class Current: 192/103.R
• CPC Class Codes: B60Y 2300/207 related to drive shaft torsion, e.g. driveline oscillations
• CPC Class Codes: F16D 2500/10412 Transmission line of a vehicle
• CPC Class Codes: F16D 2500/30415 Speed of the input shaft
• CPC Class Codes: F16D 2500/3067 Speed of the engine
• CPC Class Codes: F16D 2500/30806 Engaged transmission ratio
• CPC Class Codes: F16D 2500/30816 Speed of the input shaft
• CPC Class Codes: F16D 2500/3115 Vehicle wheel speed
• CPC Class Codes: F16D 2500/3144 Accelerator pedal position
• CPC Class Codes: F16D 2500/50653 Gearing shifting without the interruption of drive
• CPC Class Codes: F16D 2500/50684 Torque resume after shifting
• CPC Class Codes: F16D 2500/50692 Simulate the characteristics of a torque converter
• CPC Class Codes: F16D 2500/70252 Clutch torque
• CPC Class Codes: F16D 2500/7027 Engine speed
• CPC Class Codes: F16D 2500/70282 Time
• CPC Class Codes: F16D 2500/70408 Torque
• CPC Class Codes: F16D 2500/7044 Output shaft torque
• CPC Class Codes: F16D 2500/70468 Input shaft torque
• CPC Class Codes: F16D 48/064 Control of electrically or electromagnetically actuated clutches F16D48/062, F16D48/068 take precedence
• CPC Class Codes: F16H 2059/425 Rate of change of input or turbine shaft speed
• CPC Class Codes: F16H 61/688 with two inputs, e.g. selection of one of two torque-flow paths by clutches
• CPC Class Codes: F16H 63/46 : Signals to a clutch outside the gearbox

Abstract

A method for controlling an input clutch of a vehicle transmission during a tip-in includes using a current gear and rate of change of transmission input speed to determine a first torque modifier, if a peak or trough occurred in input speed, using the current gear and a difference between measured input speed and expected input speed to determine a second torque modifier, and changing a torque capacity of said clutch using said modifiers.

Claims

1. A method for controlling an input clutch of a vehicle transmission during a tip-in event, comprising:

(a) using a current gear and rate of change of transmission input speed to determine a first torque modifier;

(b) when input speed peaks or troughs, using the current gear and a difference between measured input speed and expected input speed to determine a second torque modifier;

(c) changing a torque capacity of said clutch using said modifiers.

2. The method of claim 1 wherein step (a) further comprises:

determining that said difference is greater than a target difference between expected input speed and a limit input speed.

3. The method of claim 2, wherein step (a) further comprises:

using speed of vehicle wheels and a current gear in which the transmission is operating to determine the expected input speed;

measuring a current input speed;

comparing said difference and the expected input speed.

4. The method of claim 1 wherein step (a) further comprises:

storing values of the first torque modifier in a table according to gear and the rate of change of transmission input speed;

determining the current a first torque modifier from the values of the table indexed by the current gear and the current rate of change of transmission input speed.

5. The method of claim 1 wherein step (b) further comprises:

storing values of the second torque modifier in a table according to a gear produced by the transmission and the difference between measured input speed and expected input speed;

determining the current a second torque modifier from the values of the table indexed by the current gear and the current difference between measured input speed and expected input speed.

6. The method of claim 1 wherein step (b) further comprises:

using a variation of the rate of change of input speed to determine if a peak or trough in input speed occurs.

7. A method for controlling an input clutch of a vehicle transmission during a tip-in event, comprising:

(a) using a current gear and rate of change of transmission input speed to determine a first torque modifier;

(b) after input speed produces a oscillation peak, using the current gear and a difference between measured input speed and expected input speed to determine a second torque modifier;

(c) changing a torque capacity of said clutch using said modifiers.

8. The method of claim 7 wherein step (a) further comprises:

determining that said difference is greater than a target difference between expected input speed and a limit input speed.

9. The method of claim 8, wherein step (a) further comprises:

using speed of vehicle wheels and a current gear in which the transmission is operating to determine the expected input speed;

measuring a current input speed;

comparing said difference and the expected input speed.

10. The method of claim 7 wherein step (a) further comprises:

storing values of the first torque modifier in a table according to gear and the rate of change of transmission input speed;

determining the current a first torque modifier from the values of the table indexed by the current gear and the current rate of change of transmission input speed.

11. The method of claim 7 wherein step (b) further comprises:

storing values of the second torque modifier in a table according to a gear produced by the transmission and the difference between measured input speed and expected input speed;

determining the current a second torque modifier from the values of the table indexed by the current gear and the current difference between measured input speed and expected input speed.

12. The method of claim 7 wherein step (b) further comprises:

using a variation of the rate of change of input speed to determine if a peak or trough in input speed occurs.

13. A method for controlling an input clutch of a vehicle transmission during a tip-in event, comprising:

(a) using a current gear and rate of change of transmission input speed to determine a first torque modifier when input speed crosses a speed limit;

(b) after input speed produces a peak or trough, using the current gear and a difference between measured input speed and expected input speed to determine a second torque modifier;

(c) changing a torque capacity of said clutch using said modifiers.

14. The method of claim 13 wherein step (a) further comprises:

determining that said difference is greater than a target difference between expected input speed and a limit input speed.

15. The method of claim 14, wherein step (a) further comprises:

using speed of vehicle wheels and a current gear in which the transmission is operating to determine the expected input speed;

measuring a current input speed;

comparing said difference and the expected input speed.

16. The method of claim 13 wherein step (a) further comprises:

storing values of the first torque modifier in a table according to gear and the rate of change of transmission input speed;

determining the current a first torque modifier from the values of the table indexed by the current gear and the current rate of change of transmission input speed.

17. The method of claim 13 wherein step (b) further comprises:

storing values of the second torque modifier in a table according to a gear produced by the transmission and the difference between measured input speed and expected input speed;

determining the current a second torque modifier from the values of the table indexed by the current gear and the current difference between measured input speed and expected input speed.

18. The method of claim 13 wherein step (b) further comprises:

using a variation of the rate of change of input speed to determine if a peak or trough in input speed occurs.