Granted Patent B2

US 7,151,989 · App. 10/711,244 · Granted Dec 19, 2006

Abstract

Claims (56)

1. A method of up-shifting a twin-clutch transmission of a vehicle, comprising:

detecting an incorrectly pre-selected target gear;

calculating a maximum output torque (M Red ) for an engine in said vehicle, said M Red associated with operation of said transmission in a correct target gear;

reducing a current output torque (M Motor ) for said engine to equal said M Red ; and,

engaging said correct target gear.

2. The method of claim 1 further comprising:

setting a first setpoint torque (M Mot — soll ) for said engine equal to said M Red .

3. The method of claim 1 wherein reducing a current output torque (M Motor ) further comprises decreasing a second setpoint torque M Mot — soll .

4. The method of claim 3 wherein decreasing a second setpoint torque M Mot — soll further comprises linearly decreasing said second setpoint torque M Mot — soll .

5. The method of claim 1 further comprising:

determining whether said M Motor is greater than said M Red , and,

performing at least two iterations of said steps of calculating said M Red , determining whether said M Motor is greater than said M Red , and reducing M Motor to equal said M Red .

6. The method of claim 1 wherein calculating said M Red further comprises calculating said M Red according to the following equation:

M

Red

=

firstM

FW

⁡

(

1

-

i

alt

-

i

neu

i

alt

)

,

wherein said first M FW comprises a driver's desired torque, said i alt comprises a ratio of the initial gear, and said i neu comprises a ratio of the correct target gear.

7. The method of claim 1 further comprising:

checking whether said engine torque M Motor is less than a second desired torque M FW for said engine;

increasing said M Motor to equal said second desired torque M FW ;

calculating clutch torques for first and second clutches in said twin-clutch transmission, said first clutch for a currently engaged gear and said second clutch for said correct target gear; and,

completing a cross-over shift.

8. The method of claim 7 further comprising:

setting a third setpoint torque M Mot — soll equal to said said second desired torque M FW .

9. The method of claim 7 wherein increasing said M Motor further comprises increasing a fourth setpoint torque M Mot — soll .

10. The method of claim 9 wherein increasing a fourth M Mot — soil further comprises linearly increasing said fourth M Mot — soll .

11. The method of claim 7 further comprising:

determining whether said M Motor is less than said second M FW ; and,

performing at least two iterations of said steps of checking whether said M Motor is less than said second M FW ; increasing a fourth setpoint torque M Mot — soll and, calculating said clutch torques for first and second clutches in said twin-clutch transmission.

12. A method of up-shifting a twin-clutch transmission in a vehicle, comprising:

operating said transmission in a gear, wherein a torque M Motor for said engine is associated with operation in said gear;

selecting a higher gear;

calculating a torque M Red for said engine, said M Red associated with operation of said transmission in said higher gear; and,

reducing said M Motor to equal said M Red , prior to engaging said higher gear.

13. The method of claim 12 wherein reducing said M Motor to equal said M Red , prior to engaging said higher gear further comprises decreasing a first setpoint torque M Mot — soll for said engine.

14. The method of claim 12 further comprising:

initiating a cross-over to said higher gear;

checking whether said M Motor is less than a torque M FW for said engine, said M FW associated with a throttle control input for said vehicle;

calculating clutch torques for first and second clutches in said twin-clutch transmission, said first clutch associated with said gear and said second clutch associated with said higher gear; and,

completing said cross-over shift to said higher gear.

15. The method of claim 14 further comprising increasing a setpoint torque M Mot — soll for said engine to increase said M Motor .

Assignments (6)