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People have found that although they have no knowledge of a certain property of one thing, they have gained experience in controlling the property of others. When these two types of things are consistent in certain aspects, the control of the latter can be applied to the control of the previous. For example, Cao Chong weighed an elephant, led it onto a boat, carved a waterline, and then replaced it with stones. After the boat sank to the same waterline, the weight of the stones was measured to determine the elephant’s weight

This method is actually a logical control method. Due to the fact that this control method ultimately uses experience from elsewhere, it is also called experience transfer. It achieves control through a medium that plays a transitional role in the middle, hence it is also known as conjugate control

Automatic control system refers to the use of some automatic control devices to automatically control certain key parameters in production, so that when they deviate from the normal state due to external interference (disturbance), they can be automatically adjusted and returned to the numerical range required by the process

The various process conditions in the production process cannot be static. Especially in chemical production, most of them are continuous production, and various equipment are interrelated. When the process conditions of one equipment change, it may cause some parameters in other equipment to fluctuate more or less, deviating from normal process conditions. Of course, automatic adjustment refers to the absence of direct human involvement

The automatic control system consists of a controller and a controlled object. But to achieve complex control tasks, a typical automatic control system usually should also include: fixed value components, execution components, measurement and transmission components, and comparison components

After more than 20 years of development, China’s industrial automatic control system device manufacturing industry has made significant progress, especially since the 1990s, the production of China’s industrial automatic control system device manufacturing industry has maintained an annual growth rate of over 20%.