A system is disclosed for regulating a process whose behaviour may be substantially described by a model made up of a series connection of a lag-free transmission member and a lagging member. A correcting variable (y) supplied by a regulating member (R) is connected to the process (S), to a first transmission member (M1) that corresponds to the process model, and to a second transmission member (M2) that corresponds to the lag-free transmission member of the process model. A controlled variable (x) of the process is measured and supplied to a first subtracting member, together with an assessed value (a1) supplied by the first transmission member (M1), to form an error variable (e). A command variable (w) and a fedback error variable (e) are supplied to a second subtraction member to form a first control deviation (w1). The control deviation (w1) and a second assessed value (a2) supplied by the second transmission member (M2) are supplied to a third subtraction member to form a second control deviation (w2) and the second control deviation (w2) is connected to the regulating member (R). In order to improve the stability of the regulating circuit, a lagging member (V) with a variable time constant is inserted into the feedback circuit. The invention has applications in regulators for sections with lagging times.
展开▼
