Internal combustion engine condition determination apparatus, internal combustion engine condition determination system, data analyzing apparatus, and internal combustion engine control apparatus

An internal combustion engine condition determination apparatus comprising:

• a storage device;
• and
• an execution device, wherein:
• the storage device stores mapping data that defines a mapping between an input and an output, the input being an internal combustion engine state variable, the output being a determination result related to a condition of an internal combustion engine, the internal combustion engine state variable being a parameter indicating the condition of the internal combustion engine;
• the execution device is configured to execute
• an acquisition process of acquiring the internal combustion engine state variable every time a crankshaft of the internal combustion engine rotates by a predetermined angle, and
• a first determination process of determining the condition of the internal combustion engine based on the output obtained through the mapping using the internal combustion engine state variable as the input;
• the mapping data is trained by machine learning;
• the execution device is configured to prohibit the first determination process when a rotation speed of the crankshaft is equal to or higher than a predetermined threshold;
• the storage device stores a determination function, and the determination result is obtained by substituting at least one of the internal combustion engine state variable and a variable derived from the internal combustion engine state variable into the determination function;
• and
• the execution device is configured to execute, when the rotation speed of the crankshaft is equal to or higher than the predetermined threshold, a second determination process of determining the condition of the internal combustion engine using the determination function, the second determination process being a process in which a calculation load is smaller than the first determination process and the determination function is not learned by machine learning.