INTERNAL-COMBUSTION ENGINE EGR CONTROL SYSTEM, INTERNAL-COMBUSTION ENGINE, AND INTERNAL-COMBUSTION ENGINE EGR CONTROL METHOD

摘要

According to the present invention, a control device which controls an EGR system is configured to control the degree of opening of an EGR valve on the basis of a target value of the oxygen concentration in a cylinder, corresponding to an NOx mass target value, which is a control target value for the amount of NOx discharged in exhaust gas G.