1. A method of controlling an internal combustion engine for a hybrid vehicle, wherein the internal combustion engine has a throttle and is controlled by an engine control module, the method comprising: monitoring a throttle intake pressure; determining a maximum expected air mass from the monitored throttle intake pressure; calculating a first torque capacity from a pressure model, wherein the throttle intake pressure is an input to the pressure model; calculating a second torque capacity from an air mass model, wherein the maximum expected air mass is an input to the air mass model; calculating a final torque capacity as a function of the first torque capacity and the second torque capacity; calculating a manifold pressure request as a function of the final torque capacity; and actuating the throttle as a function of the manifold pressure request.