Oil pressure estimation device and storage medium

An oil pressure estimation device comprising one or more processors configured to:

• set, as a simulation target, a torque converter including two oil chambers and a lockup clutch, the lockup clutch being switched between an engaged state and a released state in accordance with a differential pressure between the two oil chambers;
• calculate, based on an instruction differential pressure that is an instruction value of the differential pressure for the torque converter, an estimated differential pressure that is an estimated value of the differential pressure generated in the torque converter;
• store, in a memory, mapping data defining a mapping, the mapping (i) outputting as an output variable, in response to input of an input variable, an estimated differential pressure variable that is a variable indicating the estimated differential pressure, (ii) having been trained by machine learning, and (iii) including an instruction differential pressure variable that is a variable indicating the instruction differential pressure as one of a plurality of the input variables;
• and
• execute an acquisition process of acquiring a value of the input variable and a calculation process of inputting the value of the input variable acquired through the acquisition process into the mapping to calculate a value of the output variable.