Adaptive individual dynamic volumetric efficiency optimization for engines with variable cam phasers and variable lift

Abstract

A control system for an engine having a camshaft that is associated with an intake valve and a cam phaser that interfaces with the camshaft includes an air flow sensor that outputs first and second air flow signals based on mass air flow (MAF) delivered to the engine. An engine control module communicates with the air flow sensor and the cam phaser. The cam phaser adjusts an actuation time when the camshaft opens the intake valve during rotation of the camshaft. The control module further receives a rotational position signal based on the rotational position of the cam phaser and determines a rotational position of the cam phaser that delivers maximum air to the engine based on a first air flow signal measured prior to adjusting the cam phaser and a second air flow signal measured subsequent to adjusting the cam phaser.