Internal combustion engine control device

An internal combustion engine control device, comprising:

• a processing device that repeatedly executes an air amount calculation process of estimating a flow rate of intake air based on a detection value of a flow rate sensor that detects the flow rate of the intake air of an internal combustion engine at time intervals;
• and
• a storage device that stores information necessary for the air amount calculation process of the processing device,
• wherein
• the processing device is configured to
• acquire the detection value of the flow rate sensor at a predetermined acquisition cycle shorter than an execution interval of the air amount calculation process and store the detection value in the storage device,
• store a time when the detection value of the flow rate sensor is acquired in the storage device as a first time stamp in association with the detection value of the flow rate sensor, and
• store a time at which the air amount calculation process is executed each time in the storage device as respective second time stamps, and
• in each time of the air amount calculation process of the processing device,
• an execution interval calculation of calculating an execution interval of a calculation process at a current time point is performed based on the second time stamp stored in the storage device,
• an integration period having a same time width as the execution interval of the calculation process at the current time point is set based on the second time stamp stored in the storage device,
• an integration calculation of calculating an integrated mass of the intake air in the set integration period is performed based on the detection value of the flow rate sensor stored in the storage device and the first time stamp corresponding to the detection value, and
• an estimation flow rate calculation of estimating the flow rate of the intake air in the set integration period is performed based on the calculation result of the integration calculation and the calculation result of the execution interval calculation.