Adjusting Clutch Slip Based on Sensed Parameter of Transmission Shaft to Control Vehicle NVH

• US 20150024904A1
• Filed: 10/10/2014
• Published: 01/22/2015
• Est. Priority Date: 11/27/2012
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Pietron, Gregory Michael, Fujii, Yuji, Yanakiev, Diana, Kucharski, Joseph F., Kapas, Nimrod, Gibson, Alexander O'Connor, Lee, Seung-Hoon
• Granted Patent: US 9,371,066 B2
• Time in Patent Office: Days
• US Class Current: 477/70
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/026 of lock-up clutches
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 2510/0241 Clutch slip, i.e. difference between input and output speeds
• CPC Class Codes: B60W 30/18 Propelling the vehicle

Abstract

A vehicle powertrain includes a transmission and a clutch. The slip of the clutch is adjusted to a predefined target where a sensed parameter of a shaft of the transmission corresponds to a specified noise, vibration, and harshness (NVH) level in the powertrain. The sensed parameter of the transmission shaft may be one of acceleration, speed, and torque of the transmission shaft. The transmission shaft may be one of the input shaft and output shaft of the transmission.

Claims

1. A method for a powertrain having a transmission and a clutch, comprising:

adjusting slip of the clutch to a predefined target in which torque of a shaft of the transmission corresponds to a specified level of noise, vibration, and harshness (NVH) in the powertrain.

2. The method of claim 1 wherein:

the shaft is an input shaft of the transmission.

3. The method of claim 1 wherein:

the shaft is an output shaft of the transmission.

4. The method of claim 1 further comprising:

sensing the torque of the shaft using a sensor in communication with the shaft; and

detecting an amount of NVH in the powertrain based on the torque of the shaft.

5. The method of claim 4 wherein:

adjusting includes adjusting the slip of the clutch to the target such that the amount of NVH in the powertrain based on the torque of the shaft corresponds to the specified level of NVH.

6. The method of claim 4 wherein:

detecting includes detecting the amount of NVH based on a magnitude of the torque of the shaft, wherein the magnitude of the torque is one of peak-to-peak change, half peak-to-peak change, and root-mean-square of the torque of the shaft.

7. The method of claim 1 further comprising:

obtaining the target of the slip of the clutch from a database having corresponding clutch slip target and specified level of NVH pairs.

8. A method for a powertrain having a transmission and a clutch, the method comprising:

detecting an amount of noise, vibration, and harshness (NVH) in the powertrain based on torque of a shaft of the transmission; and

adjusting slip of the clutch to a predefined target corresponding to a specified level of NVH upon the amount of NVH exceeding the specified level.

9. The method of claim 8 further comprising:

sensing the torque of the shaft using a sensor in communication with the shaft to detect the amount of NVH based on the torque of the shaft.

10. The method of claim 8 wherein:

the shaft is an input shaft of the transmission.

11. The method of claim 8 wherein:

the shaft is an output shaft of the transmission.

12. The method of claim 8 wherein:

the amount of NVH is detected based on a magnitude of the torque of the shaft, wherein the magnitude of the torque is one of peak-to-peak change, half peak-to-peak change, and root-mean-square of the torque of the shaft.

13. The method of claim 8 further comprising:

obtaining the target of the slip of the clutch from a database having corresponding clutch slip target and specified level of NVH pairs.

14. A method for a powertrain having a transmission and a clutch, comprising:

adjusting slip of the clutch to a predefined target in which a sensed parameter of an output shaft of the transmission corresponds to a specified level of noise, vibration, and harshness (NVH) in the powertrain.

15. The method of claim 14 wherein:

the sensed parameter of the output shaft is torque of the output shaft.

16. The method of claim 14 wherein:

the sensed parameter of the output shaft is speed of the output shaft.

17. The method of claim 14 wherein:

the sensed parameter of the output shaft is acceleration of the output shaft.

18. The method of claim 14 further comprising:

sensing the parameter using a sensor in communication with the output shaft; and

detecting an amount of NVH in the powertrain based on the sensed parameter of the output shaft.

19. The method of claim 14 wherein:

the amount of NVH is detected based on a magnitude of the sensed parameter of the output shaft, wherein the magnitude of the sensed parameter is one of peak-to-peak change, half peak-to-peak change, and root-mean-square of the magnitude of the sensed parameter.

20. The method of claim 14 further comprising:

obtaining the target of the slip of the clutch from a database having corresponding clutch slip target and specified level of NVH pairs.