Stiction detection method of control valve based on S function
Oscillations caused by the viscous characteristics of pneumatic control valves are the most common source of deterioration in the performance of industrial control loops.Although there are many methods to detect the viscosity characteristics of control valves,the complexity or defects of these methods limit their specific application in practi-cal working conditions.This paper proposes a new method for detecting the viscous fault of the regulating valve in the process control loop.The proposed method compares the change trend of controller output(OP)and process variable(PV)(ΔPV)in the phase plane diagram with the standard S function,calculates the correlation coeffi-cient according to the difference between the actual function trend and the standard S function,and can specifically determine whether there is viscosity characteristics in the control valve through the value of the correlation coeffi-cient.The proposed method is analyzed and experimented by simulation examples and actual industrial data,and its effectiveness is verified.
control valvecorrelation coefficientS functionstiction detection
国家科技期刊平台
NSTL
万方数据
维普
