Control method, control system and electric valve

Abstract

The invention discloses a control method, a control system and an electric valve. The control method comprises the steps that an actually-measured set parameter curve is acquired; a required set parameter curve is acquired; the actually-measured set parameter curve and the required set parameter curve each comprises a corresponding relation between a position of the electric valve and set parameters; the actually-measured set parameter curve and the required set parameter curve are fit to acquire a position mapping curve; the position mapping curve comprises a corresponding relation between an actual position of the electric valve and a required position of the electric valve, and a difference value of the set parameters corresponding to a horizontal coordinate and a vertical coordinate of each point on the position mapping curve is smaller than a set difference value; a set required position is obtained according to the required set parameters and the required set parameter curve, and a set actual position is acquired according to the set required position and the position mapping curve; and the electric valve is controlled to run towards the set actual position of the electric valve. Therefore, the precision of a control process of the electric valve is improved.

Description

technical field [0001] The embodiments of the present invention relate to the field of control, in particular to a control method, a control system and an electric valve. Background technique [0002] The electric valve usually includes a controller, a stepping motor and a valve core. The controller sends a driving signal to the stepping motor to control the rotation of the stepping motor. The electric valve can be, for example, an electronic expansion valve, and the flow of the working medium can be adjusted by adjusting the position of the spool in the electronic expansion valve. [0003] In the process of controlling the operation of the electric valve, there will be situations where the corresponding relationship between the user's demand position and the flow rate of the electric valve is inconsistent with the corresponding relationship between the actual position and the flow rate of the electric valve. At present, according to the principle of consistent total stroke ...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a control method, a control system, and an electric valve, which solves the problem of large deviations in control accuracy of set parameters and improves the accuracy of the electric valve control process.

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