Patent ID: 7013866

Claim:
A method for controlling airflow in an intake manifold of a multiple-displacement engine during an engine displacement mode transition, the method comprising: determining, before a displacement mode transition, a requested mass air flow rate after the transition necessary to maintain a pre-transition engine torque output; determining an airflow transient multiplier based in part on a detected engine speed; multiplying the requested mass air flow rate by the transient multiplier to obtain a compensated requested mass air flow rate; calculating a requested percent airflow using the requested mass air flow rate and a maximum mass air flow rate for the engine at the detected engine speed; determining a requested post-transition manifold air pressure-to-barometric pressure ratio based on the requested percent airflow and the detected engine speed; determining a transient post-transition throttle position based on the requested post-transition pressure ratio; and moving a throttle plate of a throttle body to the transient post-transition throttle position upon initiating the displacement mode transition.