ocr: T PH ur nam a Mlu - - mgrtive chunge Curai et: deta PHh positve tala parttion Hyh, nema à alee - E - netr - I Chenge a - posita, negclik, orregaiwe 19-H-0 Conroler orrput FUZAFICATION RULE NFERENCIMG DERVZIFICATION Figure 2. Fuzzy logic system for nonlinear pH control.