STM32 based intelligent valve controller and control method

Abstract

The invention provides an STM32 based intelligent valve controller and control method. The controller comprises a data collection module, an STM32 control module and a motor control module; the data collection module collects the volume flowrate, temperature and valve opening degree of a controlled medium, and transmits the volume flowrate, temperature and valve opening degree to the STM32 controlmodule via an A / D conversion module, the STM32 control module processes and analyzes the data, different algorithms are used to control the motor control module according to user requirements, and thus, five intelligent control modes including valve opening degree control, volume flowrate double closed-loop control and mass flow double-closed control are realized to adapt to intelligent valve control in different conditions; and when in the mass flow double-closed control mode and the accumulated mass flow double-closed control mode, the STM32 control mode corrects the density of mass flow ofthe controlled medium at the present temperature by combining a controlled medium temperature-density relation table in a storage module, and thus, the mass flow of the controlled medium is controlled accurately.

Description

technical field [0001] The invention relates to the technical field of flow control, in particular to an STM32-based valve intelligent controller. Background technique [0002] At this stage, with the development of science and technology, many enterprises are conducting research on the intelligent control mode of valves. However, the current domestic research on valves has problems such as non-closed control mode, single function, and inaccurate mass flow control. This design studies the embedded operating system and the design of the multi-function control mode to improve these problems. [0003] First of all, many small and medium-sized enterprises now use manual or PLC methods to adjust the valves. This method cannot achieve a closed loop. The actual opening of the valve is unknown, and it is not known whether the expected goal can be achieved; [0004] Secondly, with the adjustment of the product production process, some production lines need to control the volume flow...

AI Technical Summary

Problems solved by technology

However, the current domestic research on valves has problems such as non-closed control mode, single function, and inaccurate mass flow control. This design studies the embedded operating system and the design of the multi-function control mode to improve these problems.

[0003] First of all, many small and medium-sized enterprises now use manual or PLC methods to adjust the valves. This method cannot achieve a closed loop. The actual opening of the valve is unknown, and it is not known whether the expected goal can be achieved;

[0004] Secondly, with the adjustment of the product production process, some production lines need to control the volume flow of the controlled medium, while some production lines need to control the mass flow of the controlled medium. Now when the enterprise adopts the traditional PLC control method, the controlled medium It is necessary to modify the PLC program when switching between the volume flow control mode and the mass flow control mode of the controlled medium, which seriously affects the work efficiency;

[0005] Finally, there are defects in the traditional method of mass flow control. Most enterprises obtain the volume flow of the controlled medium through the volume flow sensor, and realize the control of the mass flow of the controlled medium through the calculation of the algorithm in the PLC. However, this method The influence of temperature changes on density is not considered, so it will cause errors in mass flow control;

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