Tube pump system and method for controlling the tube pump system

A method for controlling a tube pump system including:

• a housing unit which has an inner peripheral surface formed into a circular-arc shape around an axis line;
• a tube having flexibility which is arranged along the inner peripheral surface;
• a pair of roller units which are housed in the housing unit, and are rotated around the axis line from a closing position to a releasing position around the axis line in a state where the pair of roller units close the tube;
• and a pair of drive units which are configured to respectively rotate the pair of roller units around the axis line in a same direction, the method comprising:
• a controlling step where each of the pair of drive units is controlled such that a liquid which flows into the tube from one end of the tube is discharged from the other end of the tube;
• and
• a pressure detecting step where a pressure of a liquid in a pipe connected to the other end of the tube is detected, wherein
• in the controlling step, a first rotation angle around the axis line and a second rotation angle around the axis line are controlled based on the pressure of the liquid detected by the pressure detecting step such that fluctuation of the pressure of the liquid detected in the pressure detecting step when the pair of roller units are rotated through at least one revolution falls within a predetermined value, the first rotation angle being formed between the pair of roller units when a first roller unit of the pair of roller units passes through the closing position, and the second rotation angle being formed between the pair of roller units when a second roller unit of the pair of roller units passes through the releasing position;
• and
• wherein the control step causes a memory unit to store the pressure detected by the pressure detection step when the first roller unit and the second roller unit are rotated around the axis line through at least one revolution, the control step determines whether or not the fluctuation of the pressure of the liquid detected by the pressure detection step falls within the predetermined value, and the control step controls the first rotation angle and the second rotation angle based on the pressure of the liquid detected by the pressure detection step such that the fluctuation of the pressure of the liquid falls within the predetermined value when it is determined that the fluctuation of the pressure does not fall within the predetermined value.