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过控(Control) 1. process control system consists of controlled object, measuring transmitter, controller and control valve 2. process control system classification: fixed value control system (constant setting value), follow-up control system (set value of irregular change), program control system (set value changes regularly) 3. process control system transition process: a process control system in the external factors under the influence of the transition from the original stable state to another stable state process 4. the basic technical performance requirements of process control systems include steady-state and transient, i.e. stability, accuracy, and rapidity 5. open-loop control system of the main advantages and disadvantages: simple structure, easy to operate. The cost is lower than that of the corresponding closed-loop system. There is no stability problem. Open loop control is more appropriate when the controlled variable is not easily measured or economically acceptable. But the disturbance and the setting value change will cause the deviation, causes the system controlled variable to deviate from the hope value, namely the open-loop control precision is not high. In order to ensure that the controlled variable approaches the desired value, the setpoint is always modified at any time 6. establishing the mathematic model (differential equation) of the steps: writing the dynamic equations of the determination of the controlled input variables and the output variables of the object by eliminating intermediate variables, only the input variables and output variables if the differential differential equation is nonlinear, the need for linearization 7. the mathematical model describing the characteristics of a system or link can be a differential equation, and the transfer function is another mathematical model describing the dynamic characteristics of the process control system or link 8. experimental methods of mathematical model of controlled object: step met
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