Techniques to discriminate vehicle propulsion system torque errors

A control method for a transmission of a vehicle, the control method comprising:

• initiating, by a controller of the transmission of the vehicle, a shift operation of the transmission where at least some of a plurality of clutches of the transmission are actuated to disengage a current gear of a plurality of gears of the transmission and to engage a new desired gear of the plurality of gears;
• and
• during the transmission shift operation:
• determining, by the controller and using a first speed sensor, an acceleration of an output shaft of a torque generating system that is coupled to an input shaft of the transmission based on a measured rotational speed of the torque generating system output shaft by the first speed sensor;
• determining, by the controller and using a second speed sensor, an acceleration of an output shaft of the transmission based on a measured rotational speed of the transmission output shaft by the second speed sensor;
• identifying, by the controller, an error source using a transmission model that maps differences between the determined and target accelerations back to torque generating system error and/or transmission clutch torque error;
• and
• based on the identified error source, adjusting, by the controller, the actuation of at least some of the plurality of clutches to compensate for the torque generating system error and/or transmission clutch torque error to mitigate or eliminate noise/vibration/harshness (NVH) caused by the transmission shift operation.