Suspension control device, vehicle, and suspension control method

A suspension control method for controlling an operation of a suspension of a vehicle comprising:

• an operation-induced state quantity estimation step of estimating an operation-induced state quantity which represents behavior caused by an operation of the vehicle;
• a road surface-induced state quantity estimation step of estimating a road surface-induced state quantity which represents behavior of the vehicle caused by a road surface on which the vehicle travels;
• an operation-induced state quantity conversion step of converting the operation-induced state quantity into an operation-induced required damping force by multiplying the operation-induced state quantity estimated in the operation-induced state quantity estimation step by a predetermined first coefficient;
• a road surface-induced state quantity conversion step of converting the road surface-induced state quantity into a road surface-induced required damping force by multiplying the road surface-induced state quantity estimated in the road surface-induced state quantity estimation step by a predetermined second coefficient, and converting the road surface-induced state quantity into the road surface-induced required damping force so that a magnitude of the road surface-induced required damping force and a magnitude of the operation-induced required damping force are relatively different when the operation-induced state quantity and the road surface-induced state quantity are the same;
• and
• a current value calculation step of determining a current value applied to the suspension with reference to the operation-induced required damping force converted in the operation-induced state quantity conversion step, the road surface-induced required damping force converted in the road surface-induced state quantity conversion step, and a damper speed, which is a speed of a damper of the suspension.