Method for dynamically determining peak output torque in an electrically variable transmission

摘要

A method for determining output torque limits in a vehicle powertrain (11) including an engine (14), an electrically variable transmission (10) including at least one electric motor (56, 72), and a drive train, the engine (14) is functionally coupled to an input (12) of the electrically variable transmission (10), wherein the drive train is functionally coupled to an output (64) of the electrically variable transmission (10), the method comprising: determining (172) a permissible electric motor torque operating space for the at least one electric motor (56, 72); determining (174) input torque limit values for the transmission (10) within the permissible electric motor torque operating space; determining (176, 180) electric motor torque limiting values for the at least one Electric motor (56, 72) at the input torque limits; anddetermining (182) output torque limit values of the transmission (10) based on the input torque limit values and the electric motor torque limit values, the determined electric motor torque limit values at the input torque limit values corresponding to the least restricted output torques of the transmission (10).