A PID for needle valve output pressure control based on servo motor & LabVIEW

In this paper, a PID controller is designed and constructed to control the output pressure of needle valve in the hydraulic circuit. The valve is controlled by the servo motor which has connected to it. The pressure sensor at the inlet and outlet of the valve is used to measure the pressure. Input sensor for safety and output sensor for feedback has been used. The servo motor command is sent by the LabVIEW and DAQ card. In this paper, a new formulation for PID controller is presented in LabVIEW software too.