Methods and systems for operating a driveline clutch

Patent metadata

Field	Value
Publication number	US-9108632-B2
Application number	US-201313776339-A
Country	US
Kind code	B2
Filing date	Feb 25, 2013
Priority date	May 4, 2012
Publication date	Aug 18, 2015
Grant date	Aug 18, 2015

Abstract

Systems and methods for improving operation of a hybrid vehicle are presented. In one example, operation of a driveline disconnect clutch is adjusted to compensate for clutch wear and manufacturing tolerances.

First claim

The invention claimed is:

1. A method of operating a hybrid vehicle driveline, comprising:
adjusting torque output of a driveline integrated starter/generator (DISG) in response to a difference between a desired driveline torque and an actual driveline torque during at least partially closing a driveline disconnect clutch.

2. The method of claim 1 , where the desired driveline torque is a desired torque converter impeller torque and where the actual driveline torque is an actual torque converter impeller torque.

3. The method of claim 1 , where the desired driveline torque is based on a driver demand torque.

4. The method of claim 1 , further comprising adjusting torque output of the DISG based on an open-loop estimate of driveline disconnect clutch torque.

5. The method of claim 4 , where the open-loop estimate of the driveline disconnect clutch torque is based on a driveline disconnect clutch application command.

6. The method of claim 1 , further comprising cranking an engine via closing the driveline disconnect clutch.

7. The method of claim 6 , further comprising starting the engine via supplying fuel and spark to the engine before the driveline disconnect clutch is fully closed.

8. A method of operating a hybrid vehicle driveline, comprising:
adjusting torque output of a driveline integrated starter/generator (DISG) in response to a difference between a desired driveline torque and an actual driveline torque during at least partially closing a driveline disconnect clutch; and
adjusting a driveline disconnect clutch transfer function based on the difference between the desired driveline torque and the actual driveline torque.

9. The method of claim 8 , where the transfer function describes a driveline disconnect clutch torque as a function of driveline disconnect clutch application force.

10. The method of claim 8 , further comprising cranking an engine via at least partially closing the driveline disconnect clutch.

11. The method of claim 10 , further comprising starting the engine via supplying spark and fuel to the engine before fully closing the driveline disconnect clutch.

12. The method of claim 11 , further comprising fully closing the driveline disconnect clutch in response to engine speed substantially equaling DISG speed a first time since engine stop.

13. The method of claim 8 , where the desired driveline torque is based on an accelerator pedal input.

14. The method of claim 8 , where the actual driveline torque is based on output of a torque sensor.

Assignees

• Ford Global Tech Llc

Inventors

• Gibson Alex O'Connor
• Mccallum James William Loch
• Lee Seung-Hoon
• Pietron Gregory Michael
• Fujii Yuji

Classifications

• Y10S903/902

  Prime movers comprising electrical and internal combustion motors · CPC title

• B60W2510/0275

  Clutch torque · CPC title

• B60W20/40

  Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers {(power-up or power-down of the driveline B60W30/192)} · CPC title

• Y10S903/93

  Conjoint control of different elements · CPC title

• B60K2006/4825

  Electric machine connected or connectable to gearbox input shaft · CPC title