US Patent 10183672 Method to optimize engine operation using active fuel management

A method for operating an internal combustion engine comprises providing a vehicle having an internal combustion gasoline engine including multiple cylinders and wherein the engine is operating in a deactivated cylinder mode, receiving a torque request if a cylinder reactivation torque smoothing mode is active, setting a variable torque ratio to 1.0 if the torque request is greater than a fast exit threshold torque, setting the variable torque ratio to 0.0 if the torque request is less than a slow exit threshold torque, setting the variable torque ratio to a value between 0.0 and 1.0 if the torque request is between the fast exit threshold torque and slow exit threshold torque, and calculating a component of final engine output torque.