Symmetric control method for asymmetric hydraulic system based on output feedback

A hydraulic system, output feedback technology, applied in the direction of fluid pressure actuating system components, fluid pressure actuating devices, mechanical equipment, etc., can solve the problems of difficult design and maintenance, complex control procedures, and difficulty in wide application, etc. Realize the effects of high-precision position tracking control, improved reliability and response characteristics, and easy control of system debugging

Active Publication Date: 2019-01-04
CENT SOUTH UNIV
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Problems solved by technology

[0005] Although these methods can effectively solve the asymmetry problem in theory, their common characteristics are that the theory is more complicated, the parameter adjustment is more difficult, the design and maintenance are difficult, and the requirements for engineering and technical personnel are high. Poor performance, it is difficult to be widely used in industrial field

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  • Symmetric control method for asymmetric hydraulic system based on output feedback
  • Symmetric control method for asymmetric hydraulic system based on output feedback
  • Symmetric control method for asymmetric hydraulic system based on output feedback

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Embodiment 1

[0066] Take a zero-opening valve-controlled cylinder with an inertial load as a typical example of an asymmetric hydraulic system, such as figure 2 As shown, the oil supply of the hydraulic pump controls the movement of the hydraulic cylinder through the servo valve, and the driving inertia of the hydraulic cylinder is F l The load, the mass of the load is m, x v is the displacement of the spool, because the servo valve plays a major role in the dynamic characteristics of the system, the hydraulic resistance of the valve port should be considered, in the process of continuous operation, when the oil supply pressure does not change much. In order to simplify the mathematical model of the system, the influence of the overflow valve on the dynamic characteristics of the system can be ignored, so the oil source can be regarded as a constant pressure source P S . The pressure in the left chamber of the valve-controlled cylinder is P 1 , the pressure in the right chamber of the ...

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Abstract

The invention discloses a symmetric control method for an asymmetric hydraulic system based on output feedback. The symmetric control method comprises the following steps that a, a state space mathematical model of the asymmetric hydraulic system is established through a load flow linearization equation of the hydraulic system, a flow equation of a working cavity of a hydraulic cylinder and a force balance equation of a valve-controlled cylinder piston; b, starting from the state space mathematical model, dynamic compensation control based on output feedback is conducted on the asymmetric hydraulic system, and thus the asymmetric hydraulic system is converted into a state space symmetric system; and c, unified PID control is conducted on the converted state space symmetric system. According to the symmetric control method, the problems of the large debugging amount and the narrow control range of an asymmetric controller of an asymmetric system for a long time are solved; control strategies are simplified, field adjustment is easier, an operator grasps system debugging more easily, and universality is better; and the reliability and the response characteristics of the system are greatly improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic system control, in particular to a symmetrical control method for an asymmetrical hydraulic system based on output feedback. Background technique [0002] Although there have been many research results in the study of symmetric systems, most of the actual systems are asymmetric systems, and these actual systems have significant differences in the dynamic characteristics of the system during the operation process of no-load, load, operation, and commutation. The dynamic and static characteristics of the symmetrical system are asymmetrical in the positive and negative directions, and a series of problems such as pressure jumps occur when the direction is changed. [0003] The hydraulic system has high control precision, lower price than the electrical system, and is not sensitive to medium pollution, so it is widely used in industrial control. However, the structure of the system itself and the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B21/00
CPCF15B21/001
Inventor 谭建平文跃兵
Owner CENT SOUTH UNIV
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