INTERNAL COMBUSTION ENGINE CONTROL SYSTEM

A control arithmetic unit uses a control storage area to compute a target control amount for combustion of an internal combustion engine according to a user required torque. A monitoring arithmetic unit uses a monitoring storage area to perform computation and to monitor presence or absence of a torque anomaly state in which an estimated torque is deviated from an engine required torque by a predetermined amount or more. The monitoring arithmetic unit computes the estimated torque by using a blow through state amount. The blow through state amount is a quantity of intake air blowing through out of an exhaust port in an intake stroke of the internal combustion engine, a degree to which intake air blows through out of the exhaust port, or an in-cylinder air quantity which is a quantity of air filled into a combustion chamber of the internal combustion engine.