Method and system for adjusting hybrid vehicle driveline torque

Patent metadata

Field	Value
Publication number	US-9358974-B2
Application number	US-201213708807-A
Country	US
Kind code	B2
Filing date	Dec 7, 2012
Priority date	Dec 7, 2012
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

Methods and systems for improving operation of a hybrid vehicle are presented. In one example, an engine torque estimate may be adapted in response to a torque converter impeller speed error. The methods and systems may reduce the possibility of driveline torque disturbances.

First claim

The invention claimed is:

1. A method for controlling hybrid engine torque output, comprising:
during a transient torque increase responsive to a change in desired powertrain output torque,
adjusting engine output torque and motor output torque responsive to the change in desired powertrain output torque, and further adjusting motor output torque in response to a torque converter impeller speed response; and

adjusting engine output torque for an engine output torque error in response to adjustments of motor output torque.

2. The method of claim 1 , where a torque converter is unlocked during the transient torque increase.

3. The method of claim 1 , further comprising delivering torque output from a torque converter to a multi fixed-gear automatic transmission.

4. The method of claim 1 , where a motor is a driveline-integrated starter generator (DISG).

5. The method of claim 1 , where a clutch is located in a drivetrain between a motor and engine, with the clutch engaged during the transient torque increase.

6. The method of claim 1 , further comprising adjusting an estimated engine output torque model based on torque converter impeller speed error.

7. A method for controlling hybrid engine torque output, comprising:
during a transient torque increase responsive to a change in desired powertrain output torque,
adjusting engine output torque and motor output torque responsive to the change in desired powertrain output torque, and further adjusting motor output torque in response to a torque converter impeller speed response, where adjusting motor output torque includes adjusting motor torque in response to a torque converter impeller speed error, the torque converter impeller speed error based on a difference between a desired impeller speed and a measured impeller speed.

8. The method of claim 7 , where a torque converter is unlocked during the transient torque increase.

9. The method of claim 7 , further comprising delivering torque output from a torque converter to a multi fixed-gear automatic transmission.

10. The method of claim 7 , where a motor is a driveline-integrated starter generator (DISG).

11. The method of claim 7 , where a clutch is located in a drivetrain between a motor and engine, with the clutch engaged during the transient torque increase.

12. The method of claim 7 , further comprising adjusting engine torque for an torque error in response to adjustments of a motor torque.

13. The method of claim 7 , further comprising adjusting an estimated engine output torque model based on the torque converter impeller speed error.

Assignees

• Ford Global Tech Llc

Inventors

• Doering Jeffrey Allen
• Gibson Alex O'Connor
• Reed Dennis Craig
• Oshinsky David
• Banker Adam Nathan

Classifications

• Y02T10/62

  Hybrid vehicles · CPC title

• B60W2710/028

  Clutch input shaft speed · CPC title

• B60W10/023

  Fluid clutches · CPC title

• B60W10/02

  including control of driveline clutches · CPC title

• B60Y2400/426

  Hydrodynamic couplings, e.g. torque converters · CPC title