Transmission clutch control using a flat-rate inertia modeling

摘要

A vehicle powertrain includes an engine, a transmission, a torque converter assembly, and a controller. The controller includes global driveline inertia models and instructions for performing a clutch-to-clutch shift using these models. The models jointly reduce powertrain dynamics to two or three degrees of freedom. The controller performs a procedure to estimate clutch torques using the models. The models may include a first primary inertia block describing engine inertia and inertia of a torque converter impeller and a second primary inertia model describing inertia of the turbine wheel and transmission as reflected by the input member. The second primary inertial model includes inertia models for each stall condition and every possible shift maneuver. The controller derives a required output torque value as a control target value using the flat-rate inertia models and a requested input torque and uses the estimated clutch torque to achieve the target value.