Apparatus, system, and vehicle control apparatus

A system comprising:

• a memory storing mapping data for defining mapping, the mapping including a pressure variable and a period variable as input variables, the mapping including a stroke amount as an output variable, the pressure variable indicating a waiting pressure, the period variable indicating a waiting period, in a vehicle including a transmission configured to execute a gear shifting operation for changing a gear ratio between an on-board prime mover and a driving wheel by engaging or disengaging friction engagement elements having friction members pushed by a piston that moves through hydraulic pressure supply to an oil chamber, a hydraulic pressure supplied to the oil chamber for pack filling to bring the disengaged friction engagement elements into a state immediately before engagement being defined as the waiting pressure, a movement amount of the piston during a period from the hydraulic pressure supply to the oil chamber to completion of the pack filling is defined as the stroke amount of the piston, the period required from the hydraulic pressure supply to the oil chamber to the completion of the pack filling is defined as the waiting period;
• a first processor provided in the vehicle;
• and
• a second processor provided outside the vehicle,
• wherein the first processor is configured to execute steps of:
• acquiring values of the input variables,
• transmitting acquired data,
• receiving a result of calculation from the second processor, and
• reducing wear of the friction members when the stroke amount calculated by the second processor is larger than a reference stroke amount calculated based on a total traveling distance of the vehicle, and
• the second processor is configured to execute steps of:
• receiving data transmitted by the first processor,
• calculating, as the result of calculation, a value of the output variable by inputting, to the mapping, the acquired values of the input variables, and
• transmitting the result of calculation, and
• the step of reducing wear of the friction members includes shortening an engagement period of relative rotation between first plates and second plates of the friction members.

A vehicle control apparatus comprising a first processor configured to execute steps of:

• acquiring values of input variables,
• transmitting acquired data, and
• receiving a result of calculation from a second processor, and
• reducing wear of friction members when a stroke amount calculated by a second processor is larger than a reference stroke amount calculated based on a total traveling distance of a vehicle,
• wherein the step of reducing wear of the friction members includes shortening an engagement period of relative rotation between first plates and second plates of the friction members.