Torque converter clutch control system health estimation

A torque converter clutch control system having a controller comprising a processor and a non-transitory computer-readable medium containing instructions that, when executed, perform the method comprising the steps of:

• determining rotational input and output speeds of a torque converter;
• determining a torque converter clutch slip based on the input and output speeds of the torque converter;
• determining whether a set of predetermined conditions are met for predicting the health of the torque converter clutch control system;
• gathering a plurality of initial features of the vehicle propulsion system;
• determining statistical information about the plurality of initial features;
• selecting at least one feature of the vehicle propulsion system based on the statistical information to define at least one selected feature;
• and
• classifying the health of the torque converter clutch control system based on the at least one selected feature.

A motor vehicle propulsion system comprising:

• a power source configured to generate power-source torque;
• a transmission configured to transmit the power-source torque to a final drive assembly;
• a torque converter configured to operatively connect the power source to the transmission and having:
• a fluid coupling configured to operatively connect the power source to the transmission;
• and
• a lock-up clutch arranged operatively in parallel with the fluid coupling and selectively actuated to mechanically connect the power source to the transmission;
• and
• a controller configured to:
• determine rotational input and output speeds of the torque converter;
• determine a lock-up clutch slip based on the input and output speeds of the torque converter;
• determine whether a set of predetermined conditions are met for predicting the health of the lock-up clutch;
• gather a plurality of initial features of the motor vehicle propulsion system;
• determine statistical information about the plurality of initial features;
• select at least one feature of the motor vehicle propulsion system based on the statistical information to define at least one selected feature;
• and
• classify the health of the lock-up clutch based on the at least one selected feature.