ECM security strategy for rationalizing and controlling increasing transmission torque requests above driver command

1. A control module comprising:

a predicted torque control module that determines a desired throttle area based on a transmission torque request and a desired predicted torque;

a throttle security module that determines a throttle limit based on the desired throttle area, the desired predicted torque, and whether the transmission torque request is greater than a driver torque request, and that determines an adjusted desired throttle area based on the throttle limit; and

a throttle actuator module that adjusts a throttle based on the adjusted desired throttle area.

2. The control module of claim 1 wherein the desired predicted torque indicates whether the transmission torque request is increasing and the throttle security module determines the throttle limit based on whether the transmission torque request is increasing.

3. The control module of claim 2 wherein the throttle security module does not determine the adjusted desired throttle area when the transmission torque request is not active.

4. The control module of claim 1 wherein the throttle security module determines the throttle limit further based on a selected gear and a vehicle speed.

5. The control module of claim 1 wherein the throttle security module determines a change in an output transmission speed based on the desired predicted torque and determines the adjusted desired throttle area further based on the change.

6. The control module of claim 1 wherein the throttle security module determines the adjusted desired throttle area further based on engine flare.

7. The control module of claim 1 wherein the throttle security module determines the adjusted desired throttle area further based on a throttle valve position.

8. The control module of claim 1 wherein the throttle security module includes:

a primary throttle security module that determines the adjusted desired throttle area;

a secondary throttle security module that determines a limited throttle area; and

a throttle arbitration module that determines a commanded throttle area based on the adjusted desired throttle area and the limited throttle area.

9. The control module of claim 8 wherein the primary throttle security module diagnoses a fault based on at least one of a state of the transmission torque request, the desired throttle area, an engine gear, a transmission gear, a transmission torque request time, a transmission speed ratio, engine flare, and a throttle valve position.

10. The control module of claim 9 wherein the secondary throttle security module determines the limited throttle area based on the desired predicted torque, the throttle limit, and a secondary throttle limit when the primary throttle security module diagnoses the fault.

11. A method comprising:

determining a desired throttle area based on a transmission torque request and a desired predicted torque;

determining a throttle limit based on the desired throttle area, the desired predicted torque, and whether the transmission torque request is greater than a driver torque request;

determining an adjusted desired throttle area based on the throttle limit; and

adjusting a throttle based on the adjusted desired throttle area.

12. The method of claim 11 wherein the desired predicted torque indicates whether the transmission torque request is increasing and further comprising determining the throttle limit based on whether the transmission torque request is increasing.

13. The method of claim 12 further comprising not determining the adjusted desired throttle area when the transmission torque request is not active.

14. The method of claim 11 further comprising determining the throttle limit further based on a selected gear and a vehicle speed.

15. The method of claim 11 further comprising:

determining a change in an output transmission speed based on the desired predicted torque; and

determining the adjusted desired throttle area further based on the change.

16. The method of claim 11 further comprising determining the adjusted desired throttle area further based on engine flare.

17. The method of claim 11 further comprising determining the adjusted desired throttle area further based on a throttle valve position.

18. The method of claim 11 further comprising:

determining a limited throttle area; and

determining a commanded throttle area based on the adjusted desired throttle area and the limited throttle area.

19. The method of claim 18 further comprising diagnosing a fault based on at least one of a state of the transmission torque request, the desired throttle area, an engine gear, a transmission gear, a transmission torque request time, a transmission speed ratio, engine flare, and a throttle valve position.

20. The method of claim 19 further comprising determining the limited throttle area based on the desired predicted torque, the throttle limit, and a secondary throttle limit when the fault is diagnosed.