CONTROLLER OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a controller of an internal combustion engine capable of accurately estimating an oxygen concentration in an exhaust recirculation gas.

SOLUTION: The excess air ratio λ0of the exhaust recirculation gas flowing into an exhaust gas recirculation passage 5 is calculated according to the oxygen concentration OXCE detected by an oxygen concentration sensor 25 installed in an exhaust system. Also, an exhaust recirculation gas flow velocity V is calculated according to the operating state of an engine, and an excess air ratio λn of an exhaust recirculation gas flowing into an intake tube 2 is calculated by using an excess air ratio model in which the excess air ratio λoand the exhaust recirculation gas flow velocity V are used as inputs. A fuel supply control is performed by using the excess air ratio λn.

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