Methods and system for downshifting during regeneration

Patent metadata

Field	Value
Publication number	US-9682699-B2
Application number	US-201514685900-A
Country	US
Kind code	B2
Filing date	Apr 14, 2015
Priority date	Apr 14, 2015
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Systems and methods for shifting a transmission of a hybrid driveline that includes an electric machine that operates in a regeneration mode are presented. The systems and methods may adjust a feedforward motor torque command via an adaptive parameter in response to an error that is based on percentage of shift complete.

First claim

The invention claimed is:

1. A driveline operating method for a hybrid vehicle, comprising:
receiving operating conditions to a controller via sensors in communication with the controller;
adjusting a torque applied to a transmission input shaft via a closed loop in response to a percentage of transmission gear shift complete based on the operating conditions; and
applying the torque to a transmission via a torque source, the torque source in communication with the controller, where the percentage of transmission gear shift complete is based on transmission output shaft speed in a new gear and transmission output shaft speed in a present gear, and where the percentage of transmission gear shift complete is further based on dividing present transmission output shaft speed by a transmission output shaft in a new gear speed minus the transmission output shaft speed in the present gear.

2. A driveline operating method for a hybrid vehicle, comprising:
receiving operating conditions to a controller via sensors in communication with the controller;
operating an electric machine in a generator mode based on the operating conditions;
downshifting a transmission coupled to the electric machine while the electric machine is operating in the generator mode;
adjusting torque applied to a transmission input shaft via the controller in response to an error of percentage of transmission gear shift complete; and
applying the torque to the transmission via a torque source, the torque source in communication with the controller.

3. A system, comprising:
an engine;
an electric machine;
a disconnect clutch positioned in a driveline between the engine and the electric machine;
a torque converter including a lockup clutch coupled to a motor; and
a controller including executable instructions stored in non-transitory memory for adjusting an electric machine torque command during a regeneration mode in response to a closed loop percentage of shift complete error.

4. The method of claim 1 , where adjusting torque applied to the transmission input shaft includes adjusting a torque of an electric machine.

5. The method of claim 1 , where adjusting torque applied to the transmission input shaft is performed during a downshift of a fixed step ratio transmission.

6. The method of claim 5 , where the transmission input shaft is part of the transmission of a driveline operating in a regeneration mode.

7. The method of claim 6 , where a vehicle's kinetic energy is converted to electrical energy in the regeneration mode.

8. The system of claim 3 , where the closed loop percentage of shift complete error is based on a difference between a desired percentage of shift complete and an actual percentage of shift complete.

9. The method of claim 2 , where the error of percentage of transmission gear shift complete is based on a difference between a desired transmission gear shift complete value and an actual transmission gear shift complete value.

10. The method of claim 2 , where adjusting torque applied to the transmission input shaft includes adjusting a torque of the electric machine, and where the torque source is the electric machine.

11. The method of claim 2 , where the error of percentage of the transmission gear shift complete is further input to a proportional/integral/derivative controller.

12. The method of claim 11 , further comprising providing an adaptive adjustment value from output of the proportional/integral/derivative controller.

13. The method of claim 12 , further comprising adjusting output torque of the electric machine in response to the adaptive adjustment value.

14. The method of claim 13 , where the adaptive adjustment value is stored and applied during a subsequent downshift.

15. The method of claim 2 , where the electric machine is selectively coupled to an engine.

16. The method of claim 15 , where adjusting torque applied to the transmission is during a regeneration mode transmission gear downshift.

17. The system of claim 8 , further comprising additional instructions for determining an adjustment term based on the closed loop percentage of shift complete error.

18. The system of claim 17 , where the adjustment term is based on output of a proportional/integral/derivative controller.

Assignees

• Ford Global Tech Llc

Inventors

• Nefcy Bernard D
• Colvin Daniel
• Nedorezov Felix
• Mccullough Todd

Classifications

• Y02T10/62

  Hybrid vehicles · CPC title

• B60Y2300/18125

  Regenerative braking · CPC title

• B60W2710/083

  Torque · CPC title

• B60K2006/4825

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

• Y10S903/93

  Conjoint control of different elements · CPC title