Methods and system for operating a driveline disconnect clutch

Patent metadata

Field	Value
Publication number	US-2016368485-A1
Application number	US-201514744990-A
Country	US
Kind code	A1
Filing date	Jun 19, 2015
Priority date	Jun 19, 2015
Publication date	Dec 22, 2016
Grant date	—

Abstract

Systems and methods for operating a transmission of a hybrid vehicle's driveline are presented. In one example, the systems and methods estimate a driveline disconnect clutch stroke pressure and gain via extending a line from a non-zero driveline disconnect clutch torque capacity to a zero driveline disconnect clutch torque capacity.

First claim

1 . A driveline operating method, comprising:
receiving inputs to a controller; operating a driveline disconnect clutch via the controller in response to a clutch stroke pressure, the clutch stroke pressure based on a clutch pressure minus a value, the value based on a first clutch torque transfer capacity change divided by a ratio of a second clutch torque transfer capacity change to pressure change.

2 . The method of claim 1 , further comprising determining a driveline disconnect clutch torque transfer capacity from the clutch stroke pressure.

3 . The method of claim 2 , where the driveline disconnect clutch torque transfer capacity is further based on a driveline disconnect clutch application pressure.

4 . The method of claim 1 , where the clutch stroke pressure is based on the inputs to the controller.

5 . The method of claim 4 , where the inputs include DISG torque.

6 . The method of claim 5 , where the inputs include driveline disconnect clutch application pressure.

7 . The method of claim 1 , further comprising shifting a transmission into park or neutral.

8 . A driveline operating method, comprising:
operating a driveline integrated starter/generator (DISG) in a speed control mode; increasing a driveline disconnect clutch apply pressure while the DISG is in the speed control mode; receiving inputs to a controller while increasing the driveline disconnect clutch apply pressure; and operating a driveline disconnect clutch via the controller in response to a clutch stroke pressure, the clutch stroke pressure based on a clutch pressure minus a value, the value based on a first clutch torque transfer capacity change divided by a ratio of a second clutch torque transfer capacity change to pressure change.

9 . The method of claim 8 , where a torque converter clutch is open while increasing the driveline disconnect clutch apply pressure.

10 . The method of claim 8 , further comprising preventing the DISG from entering a generator mode while increasing the driveline disconnect clutch apply pressure.

11 . The method of claim 8 , where an engine in a driveline including the DISG is not rotating.

12 . The method of claim 8 , further comprising determining a driveline disconnect clutch torque transfer capacity from the clutch stroke pressure.

13 . The method of claim 8 , where the inputs include DISG torque and driveline disconnect clutch application pressure.

14 . The method of claim 8 , further comprising placing a transmission in neutral or park while increasing the driveline disconnect clutch apply pressure.

15 . A system, comprising:
an engine; a motor; a disconnect clutch positioned in a driveline between the engine and the motor; a transmission coupled to the motor; and a controller including executable instructions stored in non-transitory memory for operating a driveline disconnect clutch via the controller in response to a clutch stroke pressure estimated from a driveline disconnect clutch gain, the driveline disconnect clutch gain based on a change in driveline disconnect clutch torque capacity divided by a change in driveline disconnect clutch apply pressure.

16 . The system of claim 15 , further comprising additional instructions to operate the motor in a speed control mode while determining the clutch stroke pressure.

17 . The system of claim 15 , where the transmission includes a torque converter clutch.

18 . The system of claim 17 , further comprising additional instructions to open the torque converter clutch while determining the clutch stroke pressure.

19 . The system of claim 15 , further comprising additional instructions to stop rotation of the engine while estimating the clutch stroke pressure.

20 . The system of claim 15 , further comprising additional instructions to shift the transmission into neutral or park.

Assignees

• Ford Global Tech Llc

Inventors

• Gibson Alexander O`Connor
• Mccullough Todd
• Nedorezov Felix
• Bichkar Akshay
• Ford Stuart N
• Ortmann Walter Joseph

Classifications

• F16D2500/50236

  Adaptations of the clutch characteristics, e.g. curve clutch capacity torque - clutch actuator displacement · CPC title

• B60W10/02 Primary

  including control of driveline clutches · CPC title

• B60W2510/0638

  Engine speed · CPC title

• B60W2710/021

  Clutch engagement state · CPC title

• F16D2500/70406

  Pressure · CPC title