Methods and systems for a driveline disconnect clutch

Patent metadata

Field	Value
Publication number	US-9340203-B2
Application number	US-201514861518-A
Country	US
Kind code	B2
Filing date	Sep 22, 2015
Priority date	May 4, 2012
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

Systems and methods for improving operation of a hybrid vehicle are presented. In one example, compensation for a driveline disconnect clutch is provided. The approaches may reduce driveline torque disturbances.

First claim

The invention claimed is:

1. A method of operating a hybrid vehicle driveline, comprising:
opening a torque converter clutch of a torque converter that is closed in response to an engine start request;
adjusting a driveline integrated starter/generator (DISG) speed in response to a desired torque converter impeller speed while the torque converter clutch is open in response to the engine start request, and where a DISG is mechanically coupled to an impeller of the torque converter and a transmission input shaft is coupled to a turbine of the torque converter; and
closing a driveline disconnect clutch in response to the engine start request.

2. The method of claim 1 , where adjusting the DISG speed includes adjusting the DISG speed as a function of torque converter turbine speed and desired torque converter impeller torque.

3. The method of claim 2 , where the desired torque converter impeller torque is based on a driver demand torque.

4. The method of claim 1 , further comprising adjusting a speed of an engine to the DISG speed.

5. The method of claim 1 , further comprising adjusting DISG torque in response to an estimated driveline disconnect clutch torque.

6. The method of claim 5 , where the estimated driveline disconnect clutch torque is based on a driveline disconnect clutch application force.

7. The method of claim 1 , further comprising operating the DISG in a speed control mode when adjusting the DISG speed.

8. A method of operating a hybrid vehicle driveline, comprising:
opening a torque converter clutch in response to an engine start request;
operating a driveline integrated starter/generator (DISG) in a speed control mode in response to the engine start request;
adjusting DISG speed based a desired torque converter impeller speed in response to the engine start request while the torque converter clutch is open;
starting an engine via closing a driveline disconnect clutch; and
locking the driveline disconnect clutch in response to a speed of the engine being equal to DISG speed.

9. The method of claim 8 , further comprising accelerating the engine to a speed of the DISG.

10. The method of claim 8 , further comprising adjusting DISG speed as a function of desired torque converter impeller torque.

11. The method of claim 8 , where the DISG is mechanically coupled to the driveline disconnect clutch and a torque converter.

12. The method of claim 8 , where the DISG speed is adjusted contemporaneously with closing the driveline disconnect clutch.

13. The method of claim 8 , further comprising adjusting a driveline disconnect clutch transfer function in response to a DISG adjustment torque output during closing the driveline disconnect clutch.

14. The method of claim 8 , where the driveline disconnect clutch is positioned in the hybrid vehicle driveline between a dual mass flywheel and the DISG.

15. A hybrid vehicle driveline system, comprising:
a driveline integrated starter/generator (DISG);
an engine;
a driveline disconnect clutch positioned in a driveline between the engine and the DISG;
a transmission including a torque converter clutch positioned downstream of the DISG; and
a controller including executable non-transitory instructions for closing the driveline disconnect clutch and operating the DISG in a speed control mode, a desired torque converter impeller torque provided via adjusting DISG speed in response to a torque converter turbine speed and the desired torque converter impeller torque.

16. The hybrid vehicle driveline system of claim 15 , further comprising additional executable non-transitory instructions to fully close the driveline disconnect clutch at a time engine speed substantially equals DISG speed after an engine stop.

17. The hybrid vehicle driveline system of claim 15 , further comprising additional executable non-transitory instructions for decoupling the DISG from the engine after a predetermined number of combustion events.

18. The hybrid vehicle driveline system of claim 15 , further comprising a dual mass flywheel positioned between the engine and the driveline disconnect clutch.

19. The hybrid vehicle driveline system of claim 15 , further comprising additional executable instructions to start the engine via closing the driveline disconnect clutch.

20. The hybrid vehicle driveline system of claim 15 , where the speed control mode includes adjusting DISG torque to adjust DISG speed.

Assignees

• Ford Global Tech Llc

Inventors

• Gibson Alex O'Connor
• Nedorezov Felix
• Doering Jeffrey Allen
• Jiang Hong

Classifications

• Y02T10/62

  Hybrid vehicles · CPC title

• B60K6/48

  Parallel type · CPC title

• B60W2710/027

  Clutch torque · CPC title

• Y10S903/902

  Prime movers comprising electrical and internal combustion motors · CPC title

• B60W30/20

  Reducing vibrations in the driveline · CPC title