Method of controlling a dual clutch transmission

Patent metadata

Field	Value
Publication number	US-10005467-B2
Application number	US-201615251652-A
Country	US
Kind code	B2
Filing date	Aug 30, 2016
Priority date	Aug 30, 2016
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A method of controlling a dual clutch transmission (DCT) for a vehicle includes steps to reduce objectionable noise present during particular driving conditions and when the vehicle is operated using certain driving habits. A DCT engages at least two gear ratios at a time; one gear ratio for the current desired gear and a second gear ratio for the next likely gear. The method detects when conditions are favorable for the objectionable noise and takes action to remove the cause of the objectionable noise.

First claim

We claim:

1. A method for controlling a dual clutch transmission in a vehicle, the method comprising:
providing a dual clutch transmission having a dual clutch module, a first and second input shafts, a first and second countershafts, a plurality of coplanar gear sets, and a plurality of synchronizers capable of providing a plurality of forward torque ratios and a reverse torque ratio;
receiving a command to engage the reverse torque ratio; shifting a first of the plurality of synchronizers to engage a reverse gear of a first of the plurality of coplanar gear sets with the first countershaft;
shifting a second of the plurality of synchronizers to engage a first gear of a second of the plurality of coplanar gear sets with the second countershaft; engaging a first clutch of the dual clutch module; detecting a plurality of events indicating an objectionable noise; shifting the second of the plurality of synchronizers to disengage the first gear of the second of the plurality of coplanar gear sets from the second countershaft.

2. The method for controlling a dual clutch transmission of claim 1 wherein providing the dual clutch transmission further comprises providing the plurality of coplanar gear sets wherein the first gear of the second of the plurality of coplanar gear sets is capable of providing a first torque ratio when engaged with the second countershaft.

3. The method for controlling a dual clutch transmission of claim 1 wherein detecting the plurality of events indicating an objectionable noise further comprises detecting a plurality of accelerator pedal depressions and releases.

4. The method for controlling a dual clutch transmission of claim 1 wherein detecting the plurality of events indicating an objectionable noise further comprises detecting a plurality of brake pedal depressions and releases.

5. The method for controlling a dual clutch transmission of claim 1 wherein detecting the plurality of events indicating an objectionable noise further comprises detecting a plurality crossovers of the zero torque point.

6. The method for controlling a dual clutch transmission of claim 1 wherein detecting the plurality of events indicating an objectionable noise further comprises detecting at least one of a plurality of accelerator pedal depressions and releases, a plurality of brake pedal depressions and releases, and a plurality crossovers of the zero torque point.

7. The method for controlling a dual clutch transmission of claim 1 wherein detecting the plurality of events indicating an objectionable noise further comprises detecting a vehicle speed of a predetermined limit.

8. The method for controlling a dual clutch transmission of claim 7 wherein the vehicle speed of a predetermined limit is at least 2 kph.

9. The method for controlling a dual clutch transmission of claim 1 wherein detecting the plurality of events indicating an objectionable noise further comprises detecting three events indicating an objectionable noise.

10. A method for controlling a dual clutch transmission in a vehicle, the method comprising:
providing a dual clutch transmission having a dual clutch module, a first and second input shafts, a first and second countershafts, a plurality of coplanar gear sets, and a plurality of synchronizers capable of providing a plurality of forward torque ratios and a reverse torque ratio, and wherein a first gear of a second of the plurality of coplanar gear sets is capable of providing a first torque ratio when engaged with the second countershaft;
receiving a command to engage the reverse torque ratio; shifting a first of the plurality of synchronizers to engage a reverse gear of a first of the plurality of coplanar gear sets with the first countershaft;
shifting a second of the plurality of synchronizers to engage a first gear of a second of the plurality of coplanar gear sets with the second countershaft; engaging a first clutch of the dual clutch module;
detecting a vehicle speed of a predetermined limit and detecting a plurality of events indicating an objectionable noise;
shifting the second of the plurality of synchronizers to disengage the first gear of the second of the plurality of coplanar gear sets from the second countershaft.

11. The method for controlling a dual clutch transmission of claim 10 wherein detecting the plurality of events indicating an objectionable noise further comprises detecting a plurality of accelerator pedal depressions and releases.

12. The method for controlling a dual clutch transmission of claim 10 wherein detecting the plurality of events indicating an objectionable noise further comprises detecting a plurality of brake pedal depressions and releases.

13. The method for controlling a dual clutch transmission of claim 10 wherein detecting the plurality of events indicating an objectionable noise further comprises detecting a plurality crossovers of a zero torque point.

14. The method for controlling a dual clutch transmission of claim 10 wherein detecting the plurality of events indicating an objectionable noise further comprises detecting at least one of a plurality of accelerator pedal depressions and releases, a plurality of brake pedal depressions and releases, and a plurality crossovers of a zero torque point.

15. The method for controlling a dual clutch transmission of claim 10 wherein the vehicle speed of a predetermined limit is at least 2 kph.

16. The method for controlling a dual clutch transmission of claim 10 wherein detecting the plurality of events indicating an objectionable noise further comprises detecting three events indicating an objectionable noise.

17. A method for controlling a dual clutch transmission in a vehicle, the method comprising:
providing a dual clutch transmission having a dual clutch module, a first and second input shafts, a first and second countershafts, a plurality of coplanar gear sets, and a plurality of synchronizers capable of providing a plurality of forward torque ratios and a reverse torque ratio, and wherein a first gear of a second of the plurality of coplanar gear sets is capable of providing a first torque ratio when engaged with the second countershaft;
receiving a command to engage the reverse torque ratio; shifting a first of the plurality of synchronizers to engage a reverse gear of a first of the plurality of coplanar gear sets with the first countershaft;
shifting a second of the plurality of synchronizers to engage a first gear of a second of the plurality of coplanar gear sets with the second countershaft; engaging a first clutch of the dual clutch module;
detecting a vehicle speed of a predetermined limit and detecting at least one of a plurality of accelerator pedal depressions and releases, a plurality of brake pedal depressions and releases, and a plurality crossovers of a zero torque point;
shifting the second of the plurality of synchronizers to disengage the first gear of the second of the plurality of coplanar gear sets from the second countershaft.

18. The method for controlling a dual clutch transmission of claim 17 wherein the vehicle speed of a predetermined limit is at least 2 kph.

19. The method for controlling a dual clutch transmission of claim 18 wherein the detecting of at least one of a plurality of accelerator pedal depressions and releases, a plurality of brake pedal depressions and releases, and a plurality crossovers of a zero torque point further comprises detecting three events of at least one of accelerator pedal depressions and releases, brake pedal depressions and releases, and crosso

Assignees

• Gm Global Tech Operations Llc

Inventors

• Schwalm Jayson S
• Hoefflin Glenn W
• Wickman Daniel J
• Boughner John William

Classifications

• B60W2520/10

  Longitudinal speed · CPC title

• B60W30/19 Primary

  Improvement of gear change, e.g. by synchronisation or smoothing gear shift · CPC title

• Y10T477/6392

  Cross-Sectional Technologies · mapped topic

• Y10T477/6414

  Cross-Sectional Technologies · mapped topic

• B60W2540/10

  Accelerator pedal position · CPC title