Servo control method, apparatus and system

Abstract

An embodiment of the invention provides a servo control method, a servo control apparatus and a servo control system for controlling the position of a piston in a pneumatic executive component, wherein the servo control method comprises the following steps of: acquiring a position feedback signal through a non-contact displacement sensor outside the pneumatic executive component, and obtaining the position of the piston; comparing the value of the position feedback signal with a preset value to obtain a signal comparison result; and controlling the movement of the piston through controlling the valve which is connected with the pneumatic executive component according to the signal comparison result. Due to the adoption of the non-contact displacement sensor in the invention, the precise control to the position of the piston is realized, and the problems, such as loss caused by the manner that a contact sensor is connected with a piston rod to detect the position of the piston so as to control the movement of the piston, are conquered.

Description

technical field [0001] The invention relates to the field of industrial control, in particular to a servo control method, device and system. Background technique [0002] The servo control commonly used in industry refers to the effective control of the movement of objects, that is, the control of the speed, position and acceleration of the movement of objects, such as industrial activities by controlling the movement of the piston in the cylinder. Generally, a sensor is used to know the position of the piston in the cylinder, such as a displacement sensor, such as a pressure (pneumatic or hydraulic) sensor, etc., and then a control signal is generated to adjust the piston to the required position. [0003] When the traditional servo control system uses a linear displacement sensor, it mostly uses a contact sensor to detect the position of the piston through a mechanical connection with the piston rod, and then controls the movement of the piston in the cylinder through a va...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems caused by the use of contact sensors to detect the position of the piston and control the movement of the piston in the pneumatic actuator in the existing servo control, the embodiment of the present invention provides a servo control method for controlling the movement of the piston in the pneumatic actuator. movement of a piston that divides the pneumatic actuator into a first chamber and a second chamber; the method comprising:

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