Patent ID: 7163007
Filing Date: 2007-01-16
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. A control system for an internal combustion engine that draws air into a cylinder via an intake system, supplies fuel injected from an injector into the cylinder, and recirculates part of exhaust gases emitted from the engine to the intake system as EGR gases by an EGR system, comprising: intake air amount control means for controlling an amount of intake air drawn into the cylinders via the intake system; intake air amount-detecting means for detecting the amount of intake air; EGR gas flow rate-estimating means for estimating a flow rate of EGR gases according to response delay of recirculation of the EGR gases by the EGR system; in-cylinder oxygen amount-estimating means for estimating an amount of oxygen existing in the cylinder, based on the detected intake air amount and the estimated flow rate of EGR gases; engine speed-detecting means for detecting a rotational speed of the engine; fuel injection parameter-determining means for determining a fuel injection parameter based on the detected rotational speed of the engine and the estimated in-cylinder oxygen amount; and injector control means for controlling the injector based on the determined fuel injection parameter.