Method of creating database for preview vibration damping control for vehicle

A method of creating a database for preview vibration damping control for a vehicle, through use of an in-vehicle electronic control unit configured to detect road surface displacement-associated information associated with a vertical displacement of a road surface at at least one of a position of a wheel and a position in front of the vehicle during running of the vehicle, and a database electronic control unit configured to store the database, the method comprising:

• determining a permissible reference value based on a vertically movable range at a time when active actuators generate a control force;
• acquiring the detected road surface displacement-associated information;
• acquiring positional information capable of identifying a position where the road surface displacement-associated information is detected;
• calculating a road surface displacement-associated value associated with the vertical displacement of the road surface, based on the road surface displacement-associated information;
• storing a set of data obtained by linking the road surface displacement-associated value and the positional information with each other as part of the database;
• correcting, in a reducing manner, a magnitude of the road surface displacement-associated value, prior to the step of storing the set of data, when it is determined that the magnitude of the road surface displacement-associated value exceeds the permissible reference value set in advance;
• and
• calculating, based on the corrected magnitude of the road surface displacement-associated value, a target control force, wherein the in-vehicle electronic control unit causes the active actuators to generate the control force corresponding to the target control force, wherein the road surface displacement-associated value is subjected to high-pass filtering processing, in the step of correcting, in the reducing manner, the magnitude of the road surface displacement-associated value, the reducing manner performed by the high-pass filtering processing.