Abstract:This paper analyzed the structure and control principle of quantitative valve. After comparing the traditional constant frequency pulse control algorithm, with the trapezoidal curve algorithm, and S curve algorithm, fitting S curve algorithm was close to control the quantitative valve. At the same time, in order to have enough acceleration and deceleration process, the subdivided driving technology was applied, by fitting 7 segments S curve and without increasing hardware cost was realiged, the precision positioning control of high-precision quantitative valve was realized．
