1) Automatic adjustment In the absence of manual direct participation, relying on instruments and automatic devices to realize the operation of determining various parameters of the production process to a given value or according to a certain rule is called automatic adjustment.
2) Adjustment object Each link that needs to be adjusted in the refrigeration system is called an adjustment object. For example, in order to adjust the temperature of the refrigerating compartment within a certain range, the refrigerating compartment is the object of adjustment of the room temperature.
3) Adjustment parameters Parameters that are required to be adjusted during the production process to characterize the changes in the production process, called adjustment parameters, or to be adjusted, output. For example, to maintain the warehouse temperature within a certain range, the warehouse temperature is called the adjustment parameter or the adjusted amount.
4) Reference value The value specified for the adjustment parameter is called the reference value. For example, the temperature requirement in a refrigerator ide refrigerated room is maintained at 0 ° C. This predetermined 0 ° C is the given value of the temperature regulation system.
5) Deviation The difference between the measured value and the given value is called the deviation. For example, the given value of the reservoir temperature is 0 ° C, and the adjusted temperature is not 0 ° C, but 0.5 ° C, and the difference of 0.5 ° C is called the deviation.
6) Disturbance The factor that changes the amount of modulation is called disturbance. For example, the cause of the above deviation, in addition to the regulator accuracy, includes changes in the outdoor temperature or changes in the thermal load within the library, which factors are referred to as disturbances, or disturbances, for this temperature automatic system.
7) Sensitive components Sensitive components are components that measure changes in the adjusted parameters. An element for sensing the size of a parameter to be modulated and outputting a signal is called a sensitive element, and is also called a measuring element, or a primary meter, such as a temperature sensor, a humidity sensor, a pressure transformer, or the like.
8) Input quantity The input quantity refers to the signal input to the automatic regulation system, including the set value and disturbance.
9) Feedback Returning all or part of the output signal to the input is called feedback. The result of the feedback is beneficial to strengthen the input signal, which is called positive feedback; on the contrary, the weakening of the input signal is called negative feedback.
10) Regulator The device that regulates the production process of the adjustment object, so that the amount to be adjusted is unchanged, or the device to be adjusted to be changed is called a regulator, which is also called a secondary instrument.
11) Adjusting the actuator Any component that accepts the regulator output signal and then controls the valve is called an actuator, such as an electromagnet in a solenoid valve. Electromagnetic valves and the like are called adjustment mechanisms. The assembly of the actuator and the adjustment mechanism is called an adjustment actuator, such as a solenoid valve.