Work machine

A work machine comprising:

• a machine body;
• a work device mounted on the machine body;
• an actuator that drives the machine body or the work device;
• a hydraulic working fluid tank;
• a hydraulic pump that sucks a hydraulic working fluid from the hydraulic working fluid tank and supplies the hydraulic working fluid to the actuator;
• a flow rate control valve that is connected in parallel to a delivery line of the hydraulic pump and controls a flow of a hydraulic fluid to be supplied from the hydraulic pump to the actuator;
• an operation lever that gives an instruction for an operation of the actuator;
• and
• a controller that controls the flow rate control valve according to an input amount of the operation lever, wherein
• the work machine includes
• a regeneration valve that allows a hydraulic working fluid to flow from a meter-out side to a meter-in side of the flow rate control valve, and
• a selector valve that is provided on a tank line connecting the flow rate control valve and the hydraulic working fluid tank to each other and opens or interrupts the tank line, and
• the controller is configured to
• calculate a target actuator flow rate that is a target flow rate for the actuator, on the basis of the input amount of the operation lever,
• calculate a regeneration flow rate that is a flow rate of a hydraulic fluid passing through the regeneration valve, on the basis of the input amount of the operation lever and the target actuator flow rate,
• subtract the regeneration flow rate from the target actuator flow rate to calculate a target actuator supply flow rate,
• calculate a target flow rate control valve opening amount on the basis of the target actuator flow rate,
• calculate a target pump flow rate that is equal to or higher than a total target actuator supply flow rate,
• control the selector valve on the basis of the input amount of the operation lever,
• control the flow rate control valve according to the target flow rate control valve opening amount, and
• control the hydraulic pump according to the target pump flow rate.