1. A method of control of a hybrid vehicle having an internal combustion engine and an auxiliary power source/sink, the method comprising:determining a torque profile for the internal combustion engine by;
determining a normalized torque profile for each stroke of a cylinder in the engine, wherein the normalized torque profile is based on intake manifold pressure;
scaling the normalized torque profile to determine the cylinder torque; and
summing the cylinder torques for all cylinders in the engine to obtain an overall engine torque profile;
determining whether the torque profile provides acceptable NVH;
when the torque profile is determined to provide acceptable NVH, operating the hybrid vehicle solely on the output of the internal combustion engine; and
when the torque profile is determined to provide unacceptable NVH, operating the hybrid vehicle on both the internal combustion engine and the auxiliary power source/sink, wherein the auxiliary power source/sink provides a smoothing torque to reduce NVH to an acceptable level.