METHODS AND SYSTEMS FOR ADAPTING A DRIVELINE DISCONNECT CLUTCH TRANSFER FUNCTION

• US 20130296123A1
• Filed: 02/25/2013
• Published: 11/07/2013
• Est. Priority Date: 05/04/2012
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Doering, Jeffrey Allen, Fujii, Yuji, Gibson, Alex O'Connor, Reed, Dennis Craig, Pietron, Gregory Michael
• Granted Patent: US 9,108,614 B2
• Time in Patent Office: Days
• US Class Current: 477/5
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/023 Fluid clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/40 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 Class Codes: B60W 2510/0275 Clutch torque
• CPC Class Codes: B60W 30/18 Propelling the vehicle
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: B60Y 2300/18083 without torque flow between driveshaft and engine, e.g. with clutch disengaged or transmission in neutral
• CPC Class Codes: F16D 2500/1107 Vehicles
• CPC Class Codes: F16D 2500/3027 Torque
• CPC Class Codes: F16D 2500/3065 Torque of the engine
• CPC Class Codes: F16D 2500/50287 Torque control
• CPC Class Codes: F16D 2500/70404 Force
• CPC Class Codes: F16D 48/06 Control by electric or electronic means, e.g. of fluid pressure
• CPC Class Codes: F16H 61/02 characterised by the signals used for shift actuators F16H61/28, for continuously variable gearings F16H61/66
• CPC Class Codes: F16H 61/14 Control of torque converter lock-up clutches
• CPC Class Codes: F16H 61/143 using electric control means
• CPC Class Codes: F16H 61/684 without interruption of drive
• CPC Class Codes: F16H 63/46 Signals to a clutch outside the gearbox

Abstract

Systems and methods for improving operation of a hybrid vehicle are presented. In one example, a transfer function of a driveline disconnect clutch is adapted.

Claims

1. A driveline disconnect clutch adaptation method, comprising:

adjusting application force of a driveline disconnect clutch in a vehicle driveline in response to a torque sensor.

2. The method of claim 1, further comprising adapting a transfer function of the driveline disconnect clutch in response to the torque sensor.

3. The method of claim 1, where a transfer function of the driveline disconnect clutch is adapted in response to a response of driveline components.

4. The method of claim 1, where adjusting application of the driveline disconnect clutch is based on increasing driveline disconnect clutch application pressure from a condition where the driveline disconnect clutch is open while an engine in the vehicle is not combusting air and fuel.

5. The method of claim 4, where a driveline integrated starter/generator is rotating during adjusting application of the driveline disconnect clutch.

6. The method of claim 5, where a transmission lock-up clutch is open during adjusting application of the driveline disconnect clutch.

7. A driveline disconnect clutch adaptation method, comprising:

rotating a torque converter impeller at a speed less than a speed based on a maximum desired torque at a torque converter turbine, the torque converter impeller in a vehicle driveline; and

adjusting application force of a driveline disconnect clutch in the vehicle driveline in response to a torque sensor while an engine in the vehicle driveline is not combusting air and fuel.

8. The driveline disconnect clutch adaptation method of claim 7, where the speed is less than a threshold speed.

9. The driveline disconnect clutch adaptation method of claim 7, where the application force is adjusted via adapting a driveline disconnect clutch transfer function.

10. The driveline disconnect clutch adaptation method of claim 9, further comprising increasing a driveline disconnect clutch command and adjusting the driveline disconnect clutch transfer function based on output of the torque sensor.

11. The driveline disconnect clutch adaptation method of claim 7, further comprising commanding opening of a torque converter clutch.

12. The driveline disconnect clutch adaptation method of claim 7, where the torque converter impeller is rotated via a driveline integrated starter/generator.

13. The driveline disconnect clutch adaptation method of claim 12, where the driveline integrated starter/generator rotates at a speed that generates a threshold transmission oil pressure that holds a transmission clutch in an applied state.

14. The driveline disconnect clutch adaptation method of claim 7, where the torque converter impeller rotates at a speed greater than a speed of the torque converter turbine.

15. A vehicle system, comprising:

an engine;

a dual mass flywheel including a first side mechanically coupled to the engine;

a driveline disconnect clutch mechanically including a first side coupled to a second side of the dual mass flywheel;

a driveline integrated starter/generator (DISG) including a first side coupled to a second side of the driveline disconnect clutch;

a transmission selectively coupled to the engine via the driveline disconnect clutch; and

a controller including executable instructions stored in non-transitory memory to adjust an estimate of torque transferred through the driveline disconnect clutch in response to a torque sensor output.

16. The vehicle system of claim 15, where the engine is not combusting air and fuel.

17. The vehicle system of claim 15, further comprising rotating the DISG at a speed below which a threshold percent of DISG torque is transferred to the transmission.

18. The vehicle system of claim 15, further comprising a torque converter including a torque converter clutch and additional instructions to open the torque converter clutch while adjusting the estimate of torque transferred through the driveline disconnect clutch.

19. The vehicle system of claim 18, further comprising additional instructions to rotate an impeller of the torque converter at a higher speed than a turbine of the torque converter.

20. The vehicle system of claim 15, further comprising additional instructions to increase a closing force applied to the driveline disconnect clutch.