Valve control apparatus and valve apparatus

A valve control apparatus for carrying out opening and closing control of a valve apparatus provided with an actuator and an integrally constructed shaft in which a driving shaft linearly moved by this actuator and a valve shaft are integrally formed with each other along an axial direction, for opening and closing a valve element with respect to a valve seat disposed in a valve housing according to a linear movement of the integrally constructed shaft in axial directions which is caused by a driving force of said actuator, said valve control apparatus comprising:

• a drive control unit for carrying out feedback control of an open position of said valve apparatus in such a way that an actual open position determined from the linear movement of said integrally constructed shaft of said valve apparatus gets close to a target open position;
• and
• a fully closed state determining unit for setting a certain soft landing start target position to said drive control unit as the target open position in response to a fully close command, and for setting the target open position which the fully closed state determining unit acquires by gradually decreasing said soft landing start target position to said drive control unit at a time when a difference between said actual open position and said soft landing start target position becomes equal to a first threshold, wherein
• said soft landing start target position is a position which is apart from an immediately preceding fully closed position learned value by at least a detection error range of the open position at a time of learning of a fully closed position.