CYLINDER SUCTION AIR AMOUNT CALCULATING DEVICE FOR ENGINE

摘要

PROBLEM TO BE SOLVED: To calculate a cylinder suction air amount for an engine at a high precision. SOLUTION: In a variable valve timing engine for an idle stop vehicle, a volume air amount to be sucked into a cylinder from the valve timing, and a mass air amount Cm in a manifold part calculated by balancing the amount of air flowing into and out of the manifold part are calculated, while a mass air amount Cc to be sucked into the cylinder based on the calculated values is calculated. Meanwhile, when an engine suspension state preventing air from being sucked in the engine is detected, an abnormality in the calculated value due to a fluctuation error of an air-flow meter is prohibited by setting the air-flow amount Qa used for calculating the amount of air flowing into the manifold part to 0.