Controller of fan coupling device

A controller of a fan coupling device, the fan coupling device including a drive shaft that is rotationally driven, a rotor coupled to the drive shaft, a housing configured to house the rotor and supported so as to be rotatable relative to the rotor, a fan fixed to the housing, a divider configured to divide an inside of the housing into a storage chamber that stores working fluid and a working chamber that houses the rotor, a labyrinth chamber formed between the housing and the rotor in the housing and configured to transmit rotational motive power of the rotor to the housing through the working fluid, and a solenoid valve configured to open and close a communicating port formed in the divider to regulate an amount of the working fluid in the labyrinth chamber, the controller comprising a processor configured to:

• acquire an estimated amount and a target amount of the working fluid in the labyrinth chamber, and a rotation speed of the drive shaft;
• calculate a control command value of an opening degree of the solenoid valve, the control command value being calculated based on a feedback control command value and a feedforward control command value, the feedback control command value being calculated based on deviation between the estimated amount and the target amount, the feedforward control command value being used to maintain a rotation speed of the fan constant based on the estimated amount and the rotation speed of the drive shaft;
• and
• control the solenoid valve using the control command value.