Gm Global Technolgoy Operations, Inc.

Nigel K Hyatt

Zhong Li

Leon O Cribbins

Carl B Bowman

Chad D Kromrey

Andrew J Harkenrider

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.

Method to optimize engine operation using active fuel management

A method of improving active fuel management reactivation torque responsiveness. The method includes detecting a driver torque request signal for increased torque output during active fuel management reactivation, modifying a torque request signal ramp rate based on excess air pressure available within an engine manifold during active fuel management, performing torque shaping on the driver torque request signal using the modified torque request signal ramp rate to obtain a shaped driver torque request signal, modifying manifold model torque estimation based on the excess air pressure available within the engine manifold during active fuel management reactivation, and modifying the smoothed driver torque request signal based on the modified manifold model to increase torque output responsiveness proportional to the driver torque request signal when exiting active fuel management.

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West Bloomfield, MI, United States of America

Nigel K Hyatt