Method of adjusting deceleration dependent shift points

A method of adjusting deceleration dependent shift points to maintain a target minimum turbine speed comprising:

• adjusting a current turbine speed to the target minimum turbine speed in response to a deceleration condition;
• calculating a vehicle speed offset based on vehicle acceleration rate and a predicted downshift delay for the target minimum turbine speed;
• converting the target minimum turbine speed to a target vehicle speed based on the deceleration condition;
• determining a target gear based on the vehicle speed offset and the target vehicle speed;
• downshifting to the target gear having vehicle speed less than or equal to a vehicle speed corresponding to the current turbine speed;
• maintaining the target gear until a shift delay period is greater than a predetermined delay threshold;
• and
• downshifting to at least one other target gear when the shift delay period is greater than the predetermined delay threshold.