Patent ID: 8515581

Claim:
A method for automatic dose control of one or more chemicals in a liquid treatment system, which comprises: inputting properties of a liquid measured on-line as input variables i into a predefined adaptation model to output an adaptation coefficient, wherein the adaption coefficient is calculated by equation Y = - 1 a n + 1 ⁢ ( a 1 ⁢ X a + a 2 ⁢ X 2 + … + a n ⁢ X n ) , wherein Y is the linguistic value of the adaptation coefficient, a i is an interaction coefficient of variables and X i is the linguistic value of input variables i, i=1 . . . n; inputting, into a feedback LE controller, an error for a property of the liquid (X error ) measured on-line and a change of an error for a property of the liquid (X change of error ) measured on-line, to output a change of control (Y change of control ) which is different from the adaptation coefficient, where Y change of control =c 3 (c 1 X error +c 2 X change of error ) where Y is a linguistic value and c i are tuning parameters i, i=1, 2, 3; modifying the control of an adaptive linguistic equation (LE) controller adaptively using the adaptation coefficient and the change of control, by multiplying the adaptation coefficient (Y) with the change of control (Y change of control ) to determine an adaptive change of control (x adaptive change of control ) by which the change of control is adapted to a quality of the liquid; and controlling the dosing of one or more chemicals to the liquid by said adaptive LE controller using said adaptive change of control, to output a dosage (y new control ) for said one or more chemicals by the equation y new control =x previous control +x adaptive change of control .