SYSTEM AND METHOD FOR CONTROLLING A TRANSMISSION GEAR SHIFT

• US 20170197628A1
• Filed: 01/12/2016
• Published: 07/13/2017
• Est. Priority Date: 01/12/2016
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: NEFCY, Bernard D., LEAR, Christopher Alan, YAMAZAKI, Mark Steven
• Granted Patent: US 10,081,364 B2
• Time in Patent Office: Days
• CPC Class Codes: B60K 6/36 characterised by the transmission gearings
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 15/2054 by controlling transmissions or clutches
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/48 related to transmissions
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60L 2240/50 related to clutches
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 7/14 for vehicles propelled by ac motors
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/30 Control strategies involving selection of transmission gear ratio control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H
• CPC Class Codes: B60W 2510/0208 Clutch engagement state, e.g. engaged or disengaged
• CPC Class Codes: B60W 2510/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2510/1015 Input shaft speed, e.g. turbine speed
• CPC Class Codes: B60W 2510/104 Output speed
• CPC Class Codes: B60W 2710/021 Clutch engagement state
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 30/19 : Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: B60W 30/20 : Reducing vibrations in the driveline
• CPC Class Codes: B60Y 2200/92 : Hybrid vehicles
• CPC Class Codes: B60Y 2300/74 : Reducing shift shocks
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y10S 903/915 : Specific drive or transmission adapted for hev

Abstract

A system and method for controlling a transmission gear shift in a vehicle having a driveline and an electric motor operable to output torque to the driveline includes applying a negative motor torque to the driveline to reduce driveline oscillations resulting from the transmission gear shift. The negative motor torque is based on vehicle conditions occurring after the transmission gear shift has begun and before the transmission gear shift is complete.

Claims

1. A method for controlling a transmission gear shift in a vehicle having a driveline and an electric motor operable to output torque to the driveline, comprising:

applying a negative motor torque to the driveline to reduce driveline oscillations resulting from the transmission gear shift, the negative motor torque being based on vehicle conditions occurring after the transmission gear shift has begun and before the transmission gear shift is complete.

2. The method of claim 1, wherein the negative motor torque is based on vehicle conditions occurring at a predetermined stage of the transmission gear shift.

3. The method of claim 2, wherein the predetermined stage of the transmission gear shift is a predetermined percentage of completion of the transmission gear shift.

4. The method of claim 3, wherein the percentage of completion of the transmission gear shift is indicated by a comparison of an output speed of the transmission to:

an input speed of the transmission translated to an off-going gear ratio in the transmission, and

the input speed of the transmission translated to an oncoming gear ratio in the transmission.

5. The method of claim 3, wherein the percentage of completion of the transmission gear shift is between 75% and 95%.

6. The method of claim 1, wherein applying the negative motor torque to the driveline occurs prior to an end of the transmission gear shift.

7. The method of claim 1, wherein applying the negative motor torque to the driveline occurs after an end of the transmission gear shift when an oncoming clutch is capacitized to a predetermined level.

8. A method for controlling a transmission gear shift in a vehicle having a driveline and an electric motor operable to output torque to the driveline, comprising:

applying a negative motor torque to the driveline to reduce driveline oscillations resulting from the transmission gear shift, the negative motor torque being based on vehicle conditions occurring at a stage of the transmission gear shift prior to completion of the transmission gear shift.

9. The method of claim 8, wherein the stage of the transmission gear shift is indicated by differences between an output speed of the transmission, an input speed of the transmission translated to an off-going gear ratio, and an input speed of the transmission translated to an oncoming gear ratio.

10. The method of claim 8, wherein the stage of the transmission gear shift is greater than 80% of completion of the transmission gear shift.

11. The method of claim 8, the vehicle further having a clutch disposed between the motor and vehicle drive wheels, the method further comprising controlling the clutch to be in a locked state during the transmission gear shift.

12. The method of claim 8, wherein applying the negative motor torque to the driveline occurs prior to an end of the transmission gear shift.

13. The method of claim 8, wherein applying the negative motor torque to the driveline occurs after an end of the transmission gear shift when an oncoming clutch is capacitized to a predetermined level.

14. A system for controlling a transmission gear shift in a vehicle having a driveline, comprising:

an electric motor operable to output torque to the driveline; and

at least one controller configured to control the motor to apply a torque to the driveline to reduce driveline oscillations resulting from the transmission gear shift, the torque being based on vehicle conditions occurring after the transmission gear shift has begun and before the transmission gear shift is complete.

15. The system of claim 14, wherein the torque is based on vehicle conditions occurring at a predetermined stage of the transmission gear shift.

16. The system of claim 15, wherein the predetermined stage of the transmission gear shift is a predetermined percentage of completion of the transmission gear shift.

17. The system of claim 16, wherein a percentage of completion of the transmission gear shift is indicated by a comparison of an output speed of the transmission to an input speed of the transmission translated to an off-going gear ratio in the transmission, and the input speed of the transmission translated to an oncoming gear ratio in the transmission.

18. The system of claim 16, wherein the percentage of completion of the transmission gear shift is between 85% and 95%.

19. The system of claim 14, wherein the at least one controller is further configured to control the motor to apply the torque to the driveline prior to an end of the transmission gear shift.

20. The system of claim 14, wherein the at least one controller is further configured to control the motor to apply the torque to the driveline after an end of the transmission gear shift when an oncoming clutch is capacitized to a predetermined level.