RATIO CONTROL OF VEHICLE OUTPUT TORQUE VERSUS ENGINE ACCELERATION IN POWER CONSTRAINED SCENARIOS

A control method for power-split hybrid electric powertrain of an electrified vehicle includes determining an output torque request for the powertrain and a previous actual output torque and maximum output torque of the powertrain, performing proportional ratio control based on the output torque request, the actual output torque, and the maximum output torque of the powertrain to determine a desired engine acceleration ratio, applying a history filter to the desired engine acceleration ratio to obtain a target engine acceleration ratio, evaluating a set of conditions and selectively arbitrating between the target engine acceleration ratio and a maximum engine acceleration ratio based on the evaluation to determine a desired engine speed profile and an engine acceleration command, and determining motor torque commands based on the desired engine speed profile and the engine acceleration command.