The invention relates to a
variable displacement variable pressure adjustment load matching electro-hydraulic
position tracking control method. The
variable displacement variable pressure adjustment load matching electro-hydraulic
position tracking control method comprises the following steps that (1) a
hydraulic cylinder speed
signal v<d> is obtained, and the
servo valve open degree feedforward control quantity S<v,d> is calculated; (2) the pump outlet pressure feedforward control quantity P<p,d> and the pump variable control valve feedforward control quantity q<a,d> are subjected to
back calculation through the inverse
model method; and (3) the pump
swash plate inclination angle phi, the pump outlet pressure P, the
hydraulic cylinder displacement x and the
hydraulic cylinder load pressure P<L> are obtained, the variable control valve actual control quantity q is obtained through the linear feedback method, the
servo valve actual control quantity S<v> is obtained through the
Backstepping method, and hydraulic cylinder
position tracking control is achieved. According to the
variable displacement variable pressure adjustment load matching electro-hydraulic position tracking control method, compared with the existing
constant pressure adjustment electro-hydraulic
position control technology, the pump outlet pressure changes according to the pressure required by loads; pressure loss is reduced; the
system efficiency is improved; and meanwhile, the method that feedforward control and
feedback control are combined is adopted, so that the hydraulic cylinder position tracking precision is high.