Torque control modeling for torque control of hybrid electric powertrains
An electrified powertrain that generates and transfers drive torque to a driveline of a hybrid electric vehicle is provided. The powertrain includes an engine, an electric motor, a clutch, a torque converter and a controller. The clutch selectively disengages an engine output from a remainder of the electrified powertrain. The torque converter transfers rotating power from at least one of the engine and the electric motor to a transmission. The controller is configured to: receive an impeller speed and a turbine speed of the torque converter; determine a target turbine torque; determine, coefficients as a function of the impeller speed, turbine speed and target turbine torque; update an adaptive lookup table based on the coefficients; and determine an adapted turbine torque based on the updated adaptive lookup table.
1. An electrified powertrain that generates and transfers drive torque to a driveline of a hybrid electric vehicle, the electrified powertrain comprising:
an engine having an engine output;
an electric motor having an electric motor output;
a clutch that selectively disengages the engine output from a remainder of the electrified powertrain;
a torque converter that transfers rotating power from at least one of the engine and the electric motor to a transmission; and
a controller configured to:
receive an impeller speed and a turbine speed of the torque converter;
determine a target turbine torque;
determine, coefficients as a function of the impeller speed, turbine speed and target turbine torque based on implementation of a Kalman filter as a function of a positive slip speed of the torque converter;
calculate impeller torque and lock-up clutch torque based on the positive slip speed of the torque converter;
update an adaptive lookup table based on the coefficients; and
determine an adapted turbine torque based on the updated adaptive lookup table.
2. The electrified powertrain of claim 1 , wherein the controller is further configured to determine a status of the clutch based on the lock-up clutch torque.
3. A method that generates and transfers drive torque to a driveline of a hybrid electric vehicle, the driveline including an engine having an engine output, an electric motor having a first electric motor output, a clutch that selectively disengages the engine output from a remainder of the electrified powertrain, a torque converter that transfers rotating power from at least one of the engine and the electric motor to a transmission, and a controller, the method comprising:
receiving, at the controller, an impeller speed and a turbine speed of the torque converter;
determining, at the controller, a target turbine torque;
determining, at the controller, coefficients as a function of the impeller speed, turbine speed and target turbine torque based on implementation of a Kalman filter as a function of a positive slip speed of the torque converter;
calculating impeller torque and lock-up clutch torque based on the positive slip speed of the torque converter;
updating, at the controller, an adaptive lookup table based on the coefficients; and
determining, at the controller, an adapted turbine torque based on the updated adaptive lookup table.
4. The method of claim 3 , further comprising:
determining, at the controller, a status of the clutch based on the lock-up clutch torque.