Dynamic braking control method for electronic expansion valve

Abstract

The invention relates to a dynamic braking control method for an electronic expansion valve. The method comprises the following steps: 1) setting e (t) and carrying out PID operation of a continuous function; 2) setting a G factor, wherein the G factor comprises a V linear variation factor, a G linear final target value and a real-time temperature of the PV; 3) setting the C factor, wherein the Cfactor comprises the residual heat of the heating material, the weight of the evaporator and the load of the inner container; 4) setting e (t), carrying out PID operation of a continuous function, andsubstituting the PID operation of the continuous function into a PLC system for PID adjustment of the analog quantity; the real-time PLC error elimination regulation is carried out in the same time into the G factor and the C factor, and the overshoot is kept within the standard by executing the original output; 5) while the output data is again fed back to e (t).

Description

technical field [0001] The invention relates to test equipment and a control method for the test equipment. Specifically, it shows a dynamic braking method for an electronic expansion valve. Background technique [0002] Temperature control system is a typical industrial control object, which is widely used in various industries in the field of industrial production, even in daily life, temperature control system is also very common. The quality of the control method and the operation effect of the temperature control system directly affect the quality of the product, the consumption of energy and the production efficiency of the equipment. The controlled object of the temperature control system is often more complex, with characteristics such as large inertia, pure hysteresis, and time-varying parameters. [0003] At present, the traditional PID control is adopted. When doing high-speed linear control, the overshoot is large, and the overshoot value is proportional to the ...

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Problems solved by technology

[0003] At this stage, the traditional PID control is used. When doing high-speed linear control, the overshoot is large, and the overshoot value is proportional to the corresponding speed. Generally, the overshoot at 15K / min is generally above 5 degrees. figure 1 Shown; GB10592 and IEC national standard require that the deviation of the environmental test chamber should generally not exceed 2 degrees. The current control method is not required to meet the standard.

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