Patent ID: 7861690
Filing Date: 2011-01-04
Classification: F02D,Y02T

Abstract:
1. A device for controlling an internal combustion engine, having a valve driving mechanism capable of varying the valve-opening characteristic in at least one of an intake valve and an exhaust valve so that the mixture of fuel and air is burnt in the interior of a combustion chamber to generate power, characterized in that the device comprises in-cylinder pressure detection means for detecting an in-cylinder pressure (Pc) within the combustion chamber, intake air pressure measuring means for either detecting or estimating an intake air pressure (Pm), in-cylinder pressure variation amount calculation means for calculating a variation amount of the in-cylinder pressure (ΔPc) for defining an amount of remaining gas in the combustion chamber due to the valve-overlap of the intake valve and the exhaust valve, intake air amount calculation means for calculating an amount of air sucked in the combustion chamber (Mair) based on the in-cylinder pressure (Pc(θ ignition means for igniting the gaseous mixture in the combustion chamber, and ignition timing control means for determining the ignition timing (θig) by the ignition means based on the intake air amount (Mair) calculated by the intake air amount calculation means, wherein the intake air amount calculation means calculates the intake air amount (Mair) by using following formula (where, β is a predetermined constant), and the in-cylinder pressure variation amount calculation means calculates the variation amount of the in-cylinder pressure (ΔPc) based on the intake air pressure (Pm(θ