Information processing device

An information processing device that acquires original data collected and created over a predetermined period using a plurality of sensors mounted on a vehicle and calculates an index value indicating a magnitude of damage accumulated in an engine-disconnecting clutch, the information processing device comprising a processing device configured to perform a process, wherein:

• the original data includes, as features, the number of engagements of the engine-disconnecting clutch and a relative rotational speed between an input shaft and an output shaft of the engine-disconnecting clutch when the engine-disconnecting clutch is engaged;
• the processing device is configured to perform a search process, the search process including
• a first step of calculating, for each of the features included in the original data, a relative frequency distribution in the original data,
• a second step of setting a plurality of time windows for clipping data of a partial period of the original data in such a manner that a sum of periods of all the time windows is shorter than the predetermined period,
• a third step of clipping data from the original data according to the time windows,
• a fourth step of calculating, for each of the features, the relative frequency distribution in extracted data obtained by combining all the data clipped according to the time windows, and
• a fifth step of calculating an error between the relative frequency distribution in the original data and the relative frequency distribution in the extracted data, and
• after the first step is performed, a trial from the second step to the fifth step being repeatedly performed by changing settings of the time windows, and the processing device performing the search process to extract the extracted data with the error equal to or less than a threshold value;
• and
• the processing device is configured to calculate the index value using the extracted data with the error equal to or less than the threshold value.