Torque converter clutch engagement pressure
A vehicle may include a controller configured to, in response to an accelerator pedal release and an expected regenerative braking event, increase an engagement pressure of a torque converter clutch prior to occurrence of the event to a threshold that is based on a regenerative braking torque estimate associated with the event such that during the event, the clutch transfers more torque than the converter.
1. A vehicle comprising:
a controller configured to, in response to accelerator pedal release and an expected regenerative braking event, increase an engagement pressure of a torque converter clutch prior to occurrence of the event to a threshold that is based on a regenerative braking torque estimate associated with the event such that during the event, the clutch transfers more torque than the converter.
2. The vehicle of claim 1 , wherein the regenerative braking torque estimate is based on a difference between an average road grade and a current road grade.
3. The vehicle of claim 1 , wherein the regenerative braking torque estimate is based on a headway range and a rate of change thereof.
4. The vehicle of claim 1 , wherein the regenerative braking torque estimate is based on a predicted deceleration rate.
5. The vehicle of claim 1 , wherein presence of the expected regenerative braking event arises from a difference between an average road grade and a current road grade.
6. The vehicle of claim 5 , wherein a duration associated with the average road grade begins with the accelerator pedal release.
7. The vehicle of claim 1 , wherein presence of the expected regenerative braking event arises from an adaptive cruise control headway range.
8. The vehicle of claim 7 , wherein presence of the expected regenerative braking event further arises from a rate of change of the adaptive cruise control headway range.
9. The vehicle of claim 1 , wherein presence of the expected regenerative braking event arises from a predicted deceleration rate.
10. The vehicle of claim 9 , wherein presence of the expected regenerative braking event further arises from a difference between the average deceleration rate and the predicted deceleration rate.
11. A vehicle comprising:
a torque converter having a bypass clutch; and
a controller configured to, in response to accelerator pedal release and a predicted regenerative braking event, increase an engagement pressure of a torque converter clutch prior to occurrence of the event to a threshold that is based on a regenerative braking torque prediction associated with the event such that during a portion of the event, the clutch transfers all torque associated with the event.
12. The vehicle of claim 11 , wherein the regenerative braking torque prediction is based on a current velocity of the vehicle and a difference between an average road grade and a current road grade.
13. The vehicle of claim 11 , wherein the regenerative braking torque prediction is based on a headway range and a rate of change thereof.
14. The vehicle of claim 11 , wherein the regenerative braking torque prediction is based on a predicted deceleration rate.
15. The vehicle of claim 11 , wherein presence of the predicted regenerative braking event arises from a difference between an average road grade and a current road grade.
16. The vehicle of claim 15 , wherein a duration associated with the average road grade begins with the accelerator pedal release.
17. The vehicle of claim 11 , wherein presence of the predicted regenerative braking event arises from an adaptive cruise control headway range.
18. The vehicle of claim 17 , wherein presence of the predicted regenerative braking event further arises from a rate of change of the adaptive cruise control headway range.
19. The vehicle of claim 11 , wherein presence of the predicted regenerative braking event arises from a predicted deceleration rate.
20. A method comprising:
in response to an accelerator pedal release, increasing, by a controller, an engagement pressure of a torque converter clutch prior to occurrence of an expected regenerative braking event to a threshold that is based on a regenerative braking torque estimate associated with the event.