Operation device and control method thereof

A control method of an operation device including

• an operation unit including, an operation body worked by a manipulation of an operator;
• a position detecting part that detects a position of the manipulation where the operation body is located;
• a display unit that displays an operation position of the operation body;
• and
• a controller that controls the operation controlling part and the display controlling part,
• wherein the operation unit includes
• an operation member that includes an operation member manipulated by the operator and having the operation body,
• a support body that freely supports the operation of the operation body, and
• a movable load applying mechanism that applies a load to the operation body,
• in which the operation body includes a movable shaft enabling the operation,
• wherein the movable load applying mechanism includes
• a movable member that operates in engagement with a movable shaft,
• a magnetic generating mechanism that sandwiches the movable member and a gap, and faces one side thereof, and
• a magnetic viscous fluid that exists in at least a part of the gap and whose viscosity changes according to a strength of a magnetic field,
• wherein the magnetic generation mechanism includes
• a coil that generates a magnetic field by energization by the operation controlling part,
• a first yoke that is provided so as to surround the coil and is disposed on one side of the movable member, and
• an operation controlling part that controls energization to the coil,
• wherein the display unit includes
• a display part that displays the operation position, and
• a display controlling part that controls a display on the display part, the control method comprising:
• forming a load curve having a plurality of peak values and a plurality of bottom values of the load depending on a strength of a current value to the coil by the operation controlling part, and
• controlling, by the controller, the display controlling part to display, on the display part, a shift state of the operation position in a case of shilling from a first peak value to a first bottom value and from the first bottom value to a next second peak value among the plurality of peak values and the plurality of bottom values.