Double-threshold return difference control method for refrigeration electromagnetic valve

Abstract

The invention relates to a dual-threshold return difference control method for a refrigeration electromagnetic valve. The dual-threshold return difference control method for the refrigeration electromagnetic valve comprises the following steps: 1) setting a temperature value SP needing to be kept; 2) setting two temperature thresholds of the electromagnetic valve as T0 and T1; 3) respectively setting the control return differences of T0 and T1: (1) setting the control return difference of T0 as (T0-Xd0, T0 + XU0), wherein XU0 is greater than 0 and Xd0 is greater than 0 and is a variable, and (2) setting the control return difference of T1 as (T1-Xd1, T1 + XU1), wherein XU1 is greater than 0, Xd1 is greater than 0 and is a variable, and T1-Xd1 is greater than T0 + XU0; and 4) when SP is closer to T0 than T1, using the control return difference of T1, and otherwise, using the control return difference of T0. The dual-threshold return difference control method for the refrigeration electromagnetic valve has the advantages that the corresponding control return difference is selected to control the refrigeration electromagnetic valve by comparing the closeness degree of the temperature value needing to be kept and the two threshold values, frequent action of the electromagnetic valve can be avoided, working condition changes of the compressor are prevented, and disturbance quantity in a closed-loop control system is avoided.

Description

technical field [0001] The invention relates to a dual-threshold hysteresis control method for a refrigeration solenoid valve, and belongs to the technical field of refrigeration solenoid valve control. Background technique [0002] The refrigeration solenoid valve is suitable for no pressure difference or low pressure system. The pulse solenoid valve inputs the positive pulse signal to the inner coil of the refrigeration solenoid valve through the wire, and the working magnetic flux generated by the coil makes the moving core close and open the valve. [0003] In some pipeline structures, the control of the refrigeration solenoid valve is closely related to the cooling effect. It controls the flow of refrigerant or refrigerant in the pipeline. When the refrigeration solenoid valve is opened or closed, the cooling capacity is small, and on the contrary, the cooling capacity is large. [0004] In the existing technology, PID is generally used for regulation and control. Due t...

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Problems solved by technology

[0004] In the existing technology, PID is generally used for regulation and control. Due to closed-loop feedback, there will be disturbances, especially when the set temperature is close to the switching threshold of the refrigeration solenoid valve, the temperature value will fluctuate around the set temperature during temperature control. , resulting in frequent action of the solenoid valve, resulting in changes in the working conditions of the compressor, which become disturbances in the closed-loop control system

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