Quick skip-at-sync control system and method

1. A control system, comprising:

a shift stage determination module that determines a duration of a first power-on downshift when a second power-on downshift is requested; and

a clutch control module that completes the first power-on downshift and that selectively starts controlling the second power-on downshift before the first power-on downshift ends, wherein a power-on downshift is a downshift of a transmission that occurs when an accelerator pedal is depressed.

2. The control system of claim 1 , wherein, based on the duration of the first power-on downshift, the clutch control module selectively controls a first off-going clutch of the first power-on downshift at or before a first sync time using a first off-going clutch control pressure that prevents a turbine deceleration, wherein the first sync time is a time when a measured turbine speed is equal to an estimated turbine speed at a commanded gear ratio of the first power-on downshift.

3. The control system of claim 2 , wherein, based on the duration of the first power-on downshift, the clutch control module selectively fully releases the first off-going clutch at or before the first sync time.

4. The control system of claim 3 , wherein the clutch control module starts releasing a first holding clutch of the first power-on downshift before the first sync time, transforming the first holding clutch into a second off-going clutch of the second power-on downshift.

5. The control system of claim 4 , wherein the clutch control module controls the first holding clutch at or before the first sync time using a minimum pressure that prevents clutch slip.

6. The control system of claim 4 , wherein the clutch control module starts releasing the first holding clutch before fully applying a second holding clutch of the second power-on downshift.

7. The control system of claim 6 , wherein the clutch control module determines an apply rate and timing based on at least one of a desired shift time and a transmission input torque, and the clutch control module applies the second holding clutch using the apply rate and timing.

8. The control system of claim 3 , wherein the clutch control module transforms a first on-coming clutch of the first power-on downshift into a second off-going clutch of the second power-on downshift by refraining from fully applying the first on-coming clutch before starting to release the second off-going clutch.

9. The control system of claim 8 , wherein the clutch control module controls the first on-coming clutch at or before the first sync time using a minimum pressure that prevents clutch slip.

10. The control system of claim 3 , wherein, based on the duration of the first power-on downshift, the clutch control module selectively fully releases the first off-going clutch after the first sync time and after starting to release a second off-going clutch of the second power-on downshift.

11. A method, comprising:

determining a duration of a first power-on downshift when a second power-on downshift is requested;

completing the first power-on downshift; and

selectively starting to control the second power-on downshift before the first power-on downshift ends, wherein a power-on downshift is a downshift of a transmission that occurs when an accelerator pedal is depressed.

12. The method of claim 11 , further comprising, based on the duration of the first power-on downshift, selectively controlling a first off-going clutch of the first power-on downshift at or before a first sync time using a first off-going clutch control pressure that prevents a turbine deceleration, wherein the first sync time is a time when a measured turbine speed is equal to an estimated turbine speed at a commanded gear ratio of the first power-on downshift.

13. The method of claim 12 , further comprising, based on the duration of the first power-on downshift, selectively fully releasing the first off-going clutch at or before the first sync time.

14. The method of claim 13 , further comprising starting to release a first holding clutch of the first power-on downshift before the first sync time, transforming the first holding clutch into a second off-going clutch of the second power-on downshift.

15. The method of claim 14 , further comprising controlling the first holding clutch at or before the first sync time using a minimum pressure that prevents clutch slip.

16. The method of claim 14 , further comprising starting to release the first holding clutch before fully applying a second holding clutch of the second power-on downshift.

17. The method of claim 16 , further comprising:

determining an apply rate and timing based on at least one of a desired shift time and a transmission input torque; and

applying the second holding clutch using the apply rate and timing.

18. The method of claim 13 , further comprising transforming a first on-coming clutch of the first power-on downshift into a second off-going clutch of the second power-on downshift by refraining from fully applying the first on-coming clutch before starting to release the second off-going clutch.

19. The method of claim 18 , further comprising controlling the first on-coming clutch at or before the first sync time using a minimum pressure that prevents clutch slip.

20. The method of claim 13 , further comprising, based on the duration of the first power-on downshift, selectively fully releasing the first off-going clutch after the first sync time and after starting to release a second off-going clutch of the second power-on downshift.