Control systems to dampen output shaft oscillations, vehicles and transmissions incorporating the same, and methods therefor

A transmission comprising:

• an input shaft to receive torque from a drive unit;
• an output shaft to transmit torque to a load;
• at least one torque-transmitting mechanism coupled between the input shaft and the output shaft;
• and
• a control system including an output speed sensor to provide an input signal indicative of a rotational speed of the output shaft and a controller communicatively coupled to the output speed sensor,
• wherein:
• the controller includes a processor and memory having instructions stored therein,
• the instructions are executable by the processor to cause the processor to monitor the rotational speed of the output shaft based on the input signal, to determine a difference between the monitored rotational speed and a reference rotational speed of the output shaft, and to determine an adjustment to an oncoming clutch pressure to be applied to the at least one torque-transmitting mechanism based on the difference, and
• the transmission is devoid of a mechanical damper coupled to the output shaft.

A method of dampening oscillations at an output shaft of a transmission, the method comprising:

• monitoring, by a controller, a rotational speed of the output shaft based on an input signal provided by an output speed sensor;
• determining, by the controller, a difference between the monitored rotational speed and a reference rotational speed of the output shaft;
• determining, by the controller, an adjustment to an oncoming clutch pressure to be applied to at least one torque-transmitting mechanism of the transmission based on the difference;
• determining, by the controller, a compensated clutch pressure to be applied to the at least one torque-transmitting mechanism based on the adjustment;
• and
• applying, by the controller, the compensated clutch pressure to the at least one torque-transmitting mechanism to dampen oscillations at the output shaft in use of the transmission.