Internal combustion engine control system

An internal combustion engine control system comprising:

• a computer and storage memory storing instructions such that when the instructions are executed by computer, the computer is at least configured to:
• perform a control arithmetic by using a control storage area to perform computation to compute a target control amount that is a target value of control amount, by which a state of combustion of an internal combustion engine is controlled, according to a user required torque that is a driving torque of the internal combustion engine required by a user;
• and
• perform a monitoring arithmetic by using a monitoring storage area different from the control storage area to perform computation and 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 estimated torque being an estimated value of actual torque of the internal combustion engine, the engine required torque being required of the internal combustion engine, wherein
• to perform the monitoring arithmetic, the computer is configured to compute the estimated torque by using a blow through state amount, wherein
• the blow through state amount is
• a blow through quantity that 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 that is a quantity of air filled into a combustion chamber of the internal combustion engine, wherein
• to perform the control arithmetic, the computer is further configured to calculate the blow through state amount used to compute the target control amount,
• to perform the monitoring arithmetic, the computer is further configured to acquire the blow through the calculated state amount,
• to perform the monitoring arithmetic, the computer is further configured to compute the estimated torque by using the acquired blow through state amount,
• when the acquired blow through state amount is out of a predetermined range and to perform the monitoring arithmetic, the computer is further configured to limit the blow through state amount used to compute the estimated torque to an upper limit or a lower limit of the predetermined range,
• to perform the monitoring arithmetic, the computer is further configured to perform computation using a signal acquired from an input processing circuit, and
• to perform the monitoring arithmetic, the computer is further configured to check whether data of the signal acquired from the input processing circuit is normal to thereby guarantee the data.