Transmission oil delivery control system and method

1. A control system for a transmission of a vehicle including an engine, comprising:

a deceleration fuel cutoff module that initiates a deceleration fuel cutoff period of engine operation; and

an accumulator module that increases a working pressure of a transmission accumulator in response to a start of said deceleration fuel cutoff period.

2. The control system of claim 1 , wherein said accumulator module operates a pump used to charge said transmission accumulator in response to said start of said deceleration fuel cutoff period.

3. The control system of claim 2 , wherein said pump is powered via torque supplied by one of said engine and said transmission.

4. The control system of claim 2 , wherein said accumulator module operates an electric motor that powers said pump.

5. The control system of claim 1 , wherein:

said accumulator module charges said transmission accumulator by operating a pump when said working pressure is less than a recharge pressure; and

said accumulator module adjusts said recharge pressure between a first pressure during periods other than said deceleration fuel cutoff period to a second pressure greater than said first pressure during said deceleration fuel cutoff period.

6. The control system of claim 5 , wherein said accumulator module increases said recharge pressure based on a measured working pressure at said start of said deceleration fuel cutoff period.

7. The control system of claim 1 , wherein said transmission accumulator supplies pressurized fluid to an actuator controlling one of a clutch and a gear synchronizer.

8. The control system of claim 1 , wherein said accumulator module increases said working pressure while a vehicle brake is applied.

9. The control system of claim 1 , wherein said transmission is a dual-clutch transmission.

10. The control system of claim 1 , wherein said transmission accumulator is a hydro-pneumatic accumulator.

11. A method for controlling a transmission of a vehicle including an engine, comprising:

initiating a deceleration fuel cutoff period of engine operation; and

increasing a working pressure of a transmission accumulator in response to a start of said deceleration fuel cutoff period.

12. A method for controlling a transmission of a vehicle including an engine, comprising:

initiating a deceleration fuel cutoff period of engine operation;

increasing a working pressure of a transmission accumulator in response to a start of said deceleration fuel cutoff period; and

operating a pump used to charge said transmission accumulator in response to said start of said deceleration fuel cutoff period.

13. The method of claim 12 , further comprising powering said pump via torque supplied by one of said engine and said transmission.

14. The method of claim 12 , further comprising operating an electric motor that powers said pump.

15. The method of claim 11 , further comprising:

charging said transmission accumulator by operating a pump when said working pressure is less than a recharge pressure; and

adjusting said recharge pressure between a first pressure during periods other than said deceleration fuel cutoff period to a second pressure greater than said first pressure during said deceleration fuel cutoff period.

16. The method of claim 15 , further comprising increasing said recharge pressure based on a measured working pressure at said start of said deceleration fuel cutoff period.

17. The method of claim 11 , wherein said transmission accumulator supplies pressurized fluid to an actuator controlling one of a clutch and a gear synchronizer.

18. The method of claim 11 , further comprising increasing said working pressure while a vehicle brake is applied.

19. The method of claim 11 , wherein said transmission is a dual-clutch transmission.

20. The method of claim 11 , wherein said transmission accumulator is a hydro-pneumatic accumulator.