Multi-hydraulic cylinder synchronization control method

A synchronous control, multi-hydraulic cylinder technology, used in fluid pressure actuation devices, fluid pressure actuation system components, servo motors, etc., can solve the problem that the movement accuracy cannot be guaranteed, the movement constraints of all cylinders, and the inability to coordinate the slave cylinder and the master cylinder. Speed ​​matching and other issues

Active Publication Date: 2010-03-17
CISDI ENG CO LTD
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AI Technical Summary

Problems solved by technology

The master-slave method has the following disadvantages: (1) The selection of the master cylinder is difficult. If a relatively poor cylinder is selected as the master cylinder, the movement of all cylinders will be restricted.
The motion accuracy of th...

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  • Multi-hydraulic cylinder synchronization control method
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  • Multi-hydraulic cylinder synchronization control method

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Embodiment Construction

[0026] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0027] Each hydraulic cylinder has a displacement sensor to measure the actual displacement. A separate control loop such as figure 1 Shown: First, the controller judges whether the actual displacement value PV of the cylinder reaches the stroke value at a certain moment. If it reaches it, the value of SP is equal to the stroke value. If it does not reach it, the PID setting is calculated according to the actual position value PV of the hydraulic cylinder. Fixed value SP; then the PID algorithm calculates an output value according to the set value SP and PV, where the PID output value is the opening setting of the proportional valve. Send this PID output value to the input of the proportional valve, and the proportional valve will move the spool according to this value, causing the hydraulic cylinder to move. Since a closed-loop control is to be formed, the...

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Abstract

The invention discloses a multi-hydraulic cylinder synchronization control method, and the control method comprises the following steps: A, using a controller to judge whether the displacement actualvalue PV of cylinders at a certain time achieves the stroke value or not, if so, leading the set value SP of a PID to be equal to the stroke value; if not, figuring out the set value SP of the PID according to the actual position value PV of the hydraulic cylinders; using the PID algorithm to obtain the set value of the opening degree of a proportional valve according to the SP and the PV, leadingthe proportional valve to carry out movement of a valve core according to the set value of the opening degree and initiating the motion of the hydraulic cylinders; and B, feeding back the actual position value PV of the hydraulic cylinders to the controller and returning to the step A. The synchronization control method does not limit the number of the moving cylinders and does not divide the work of the master moving cylinder and the slave moving cylinders, the motion speed and the precision of the cylinders can be regulated through parameters, the motion speed of the cylinders is not fixed,the target value can be achieved by the fast speed, and the closer the displacement value between the forefront cylinder and the last cylinder is, the faster the overall motion speed is.

Description

technical field [0001] The invention relates to a synchronous control method, in particular to a synchronous control method for multiple hydraulic cylinders. Background technique [0002] Hydraulic components are used more and more in modern metallurgical equipment. They have the characteristics of fast response, high speed, stable action, and high control precision. put forward higher requirements. The hydraulic component is an executive device, and its movement rule depends entirely on electrical professional control. Electrical control must be as safe, stable, fast, and high-precision as possible. At present, the most commonly used synchronous control method is the master-slave method, which is to select one cylinder as the master cylinder, and use the movement of the master cylinder as the basic movement, and the other cylinders are slave cylinders to follow the master cylinder. The master cylinder moves, the slave cylinder moves, the master cylinder moves fast, the sl...

Claims

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Application Information

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IPC IPC(8): F15B21/08F15B11/22
Inventor 龙灏
Owner CISDI ENG CO LTD
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