Methods and system controlling a power take off

Patent metadata

Field	Value
Publication number	US-11566672-B1
Application number	US-202117449170-A
Country	US
Kind code	B1
Filing date	Sep 28, 2021
Priority date	Sep 28, 2021
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

Systems and methods for operating a power take off of a vehicle are described. In one example, operation of the power take off may be maintained even when slip of a power take off clutch is detected. In particular, the power take off may be operated at a lower output until the power take off may handle larger loads.

First claim

The invention claimed is:

1. A method for operating a power take off of a vehicle gearbox, comprising:
maintaining or increasing a closing force applied to a clutch of the power take off and reducing torque output of an electric machine in response to slip of the clutch exceeding a threshold.

2. The method of claim 1 , further comprising providing an indication of slip in response to the slip of the clutch exceeding the threshold.

3. The method of claim 2 , where the indication is provided via a human/machine interface.

4. The method of claim 1 , further comprising providing an indication of a rotational angle where the slip of the clutch exceeds the threshold.

5. The method of claim 1 , where the slip is a speed difference between a first side of the clutch and a second side of the clutch.

6. The method of claim 1 , further comprising estimating a temperature of the power take off as a function of power take off torque, speed, and vibration level.

7. The method of claim 6 , further comprising determining whether or not the slip of the clutch is in a desired range, where the desired range is a function of the temperature of the power take off.

8. A system, comprising:
a power source;
a driveline including a gearbox and a power take off coupled to the gearbox, the power take off including a clutch; and
a controller including executable instructions stored in non-transitory memory that cause the controller to maintain or increase a closing force that is applied to the clutch and adjust a torque of the power source in response to a vibration level of the power take off.

9. The system of claim 8 , further comprising additional instructions to maintain or increase a closing force that is applied to the clutch and adjust a torque of the power source in response to slip of the clutch exceeding a threshold.

10. The system of claim 8 , where adjusting the torque of the power source includes decreasing torque output of the power source.

11. The system of claim 10 , where the power source is an electric machine.

12. The system of claim 8 , further comprising additional instructions to reduce the torque of the power source such that the vibration level is reduced to less than a threshold while the power source rotates.

13. The system of claim 12 , further comprising additional instructions to indicate the vibration level via a human/machine interface.

14. The system of claim 8 , further comprising additional instructions to estimate a temperature of the power take off based on torque and speed of the power take off.

15. The system of claim 8 , where the power take off supplies mechanical power to a device that is external to a vehicle.

16. A method for operating a power take off of a vehicle gearbox, comprising:
increasing a speed of an electric machine in response to a temperature of a power take off after reducing torque output of the electric machine in response to slip of a clutch of the power take off exceeding a threshold.

17. The method of claim 16 , further comprising maintaining or increasing a closing force applied to the clutch.

18. The method of claim 16 , further comprising indicating the slip of the clutch via a human/machine interface.

19. The method of claim 18 , further comprising providing an indication of increasing the speed of the electric machine before the speed of the electric machine is increased.

20. The method of claim 16 , further comprising estimating a temperature of the power take off based on power take off speed and torque.

Assignees

• Ford Global Tech Llc

Inventors

• Salter Stuart
• Berry Hussein
• Andonian Brian
• Boerema Richard
• Robertson Edwin D

Classifications

• F16D2500/30406

  Clutch slip · CPC title

• F16D48/06 Primary

  Control by electric or electronic means, e.g. of fluid pressure · CPC title

• F16D2500/7104

  Visual alarms · CPC title

• F16D2500/316

  Other signal inputs not covered by the groups above · CPC title

• F16D2500/1023

  Electric motor · CPC title