CONTROLLER FOR INTERNAL COMBUSTION ENGINE

摘要

Disclosed is an internal combustion engine controller which is adapted such that the amount of oxygen occluded in a catalyst in an exhaust gas path and the amount of oxygen occluded in a catalyst in an exhaust gas recirculation path are appropriately adjusted in a quick manner after recovery from fuel cut. The controller controls an internal combustion engine which includes a recirculation gas forming cylinder and a recirculation gas non-forming cylinder. The controller includes the exhaust gas recirculation path for coupling between the exhaust gas path, through which only the exhaust gas from the recirculation gas forming cylinder flows, and an intake air line. The controller also includes a recirculation catalyst which is disposed at some midpoint in the exhaust gas recirculation path, and a rich control means for providing rich control to temporarily set an air-fuel ratio richer than a theoretical one when fuel injection is restarted after recovery from fuel cut. The rich control means includes an air-fuel ratio control means which makes the air-fuel ratio in the recirculation gas forming cylinder richer than the air-fuel ratio in the recirculation gas non-forming cylinder when the rich control and the recirculation of exhaust gas through the exhaust gas recirculation path are simultaneously executed.