A system for a vehicle , the system comprising: a drive unit configured to output torque, the drive unit including an output shaft , a transmission configured to transmit torque output by the drive unit to a load , the transmission including an input shaft , a torque converter coupled between the drive unit and the transmission , the torque converter including a pump coupled to the output shaft of the drive unit , a turbine coupled to the input shaft of the transmission , a lockup clutch selectively engageable to mechanically couple the pump to the turbine to transmit torque between the drive unit and the transmission ; and a torque converter controller having a processor and memory , the memory having instructions stored therein that are executable by the processor to cause the processor to (i) determine whether the vehicle is in a coasting condition, (ii) determine whether a rotational speed of the output shaft of the drive unit has reached a target speed above a reference threshold, and (iii) engage the lockup clutch to maintain the rotational speed of the output shaft above the reference threshold in response to a determination that the motor vehicle is in the coasting condition and that the rotational speed of the output shaft has reached the target speed, wherein to engage the lockup clutch comprises to receive a signal indicative of a rotational speed of the turbine from a turbine speed sensor and determine a target torque output by the pump based on the target speed of the output shaft of the drive unit and the signal, and wherein to engage the lockup clutch comprises to calculate a lockup clutch torque based on the determined target torque output by the pump and a torque signal indicative of torque associated with the drive unit . a drive unit configured to output torque, the drive unit including an output shaft , a transmission configured to transmit torque output by the drive unit to a load , the transmission including an input shaft , a torque converter coupled between the drive unit and the transmission , the torque converter including a pump coupled to the output shaft of the drive unit , a turbine coupled to the input shaft of the transmission , a lockup clutch selectively engageable to mechanically couple the pump to the turbine to transmit torque between the drive unit and the transmission ; and a torque converter controller having a processor and memory , the memory having instructions stored therein that are executable by the processor to cause the processor to (i) determine whether the vehicle is in a coasting condition, (ii) determine whether a rotational speed of the output shaft of the drive unit has reached a target speed above a reference threshold, and (iii) engage the lockup clutch to maintain the rotational speed of the output shaft above the reference threshold in response to a determination that the motor vehicle is in the coasting condition and that the rotational speed of the output shaft has reached the target speed, wherein to engage the lockup clutch comprises to receive a signal indicative of a rotational speed of the turbine from a turbine speed sensor and determine a target torque output by the pump based on the target speed of the output shaft of the drive unit and the signal, and wherein to engage the lockup clutch comprises to calculate a lockup clutch torque based on the determined target torque output by the pump and a torque signal indicative of torque associated with the drive unit . <EOS>