Automatic packaging line continuous control system:
The parameter changes in the system are continuous, that is, the signal transmission of the system and the response of the controlled object are uninterrupted continuous quantities or analog quantities. The temperature control and motor speed regulation systems mentioned earlier belong to continuous control systems. Automated production line manufacturers tell you that according to the relationship between the output and input of the system, this type of system can be divided into:
The system is composed of linear components, and each link can be described by linear differential equations to meet the superposition principle, that is, when several perturbations or control actions act on the system at the same time, the total effect is equal to the sum of the effects caused by each individual action.
Some links in the system have nonlinear properties, such as saturation, dead zone, friction and so on. Such systems are often described by nonlinear differential equations, which do not satisfy the superposition principle.
Automatic packaging line intermittent control system
Intermittent control system is also known as discrete control system, the internal signal of the system is intermittent quantity, which can be divided into:
(1) The characteristic of the sampling control system is to sample the controlled continuous analog quantity at a certain frequency through the sampling device, convert it into a digital quantity and send it to the computer or numerical control device, after data processing or operation, output control instructions, and convert it into an analog quantity to control the controlled object through digital-analog. The sampling frequency is often much higher than the change frequency of the object.
(2) The switching control system is a control system composed of switching components that work intermittently. Since the switching element only has two distinct states of "on" and "off", it cannot continuously reflect the change of the control signal, so the control that the system can achieve is necessarily intermittent. Automatic opening and sealing system manufacturers tell you that the common relay contactor control system, programmable controller system and so on belong to the switch control system. The same switch control system has two kinds of open loop and closed loop. Logic algebra is the basis of open-loop switching control theory.
