Control method for asymmetric electric-hydraulic proportional system based on model transferring

An electro-hydraulic proportional and model conversion technology, which is applied in fluid pressure actuation system testing, fluid pressure actuation devices, servo motors, etc., can solve problems such as difficult design and maintenance, high requirements for engineering and technical personnel, and complex control procedures

Active Publication Date: 2015-08-19
CENT SOUTH UNIV
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Problems solved by technology

However, their common features are that the theory is more complex, there are more parameter adjustments, the design and maintenance are difficult, and the requirements for engineering and technical personnel are high.
And because the control program is more complicated and the r...

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  • Control method for asymmetric electric-hydraulic proportional system based on model transferring
  • Control method for asymmetric electric-hydraulic proportional system based on model transferring
  • Control method for asymmetric electric-hydraulic proportional system based on model transferring

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] A control method for an asymmetric electro-hydraulic proportional system based on model transformation, which transforms the asymmetric mathematical model of the asymmetric electro-hydraulic proportional system into a symmetrical system model by using the transformation transfer function, and realizes the symmetrical transformation of the load flow model, making the use of When the controller is unified, the positive and negative motion responses are consistent;

[0045] The internal structure diagram of the asymmetric electro-hydraulic proportional system, such as figure 2 shown.

[0046] The positive movement of the asymmetric cylinder in the y direction is the positive movement of the system, otherwise it is the reverse movement of the system; the ratio of the two chamber areas of the asymmetric cylinder is η=A 2 / A 1 , when η=1, it is a s...

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Abstract

The invention discloses a control method for an asymmetric electric-hydraulic proportional system based on model transferring. By converting a transfer function, an asymmetric mathematical model of the asymmetric electric-hydraulic proportional system is converted into a symmetric system model, the symmetry of a load flow model is achieved, and when a unified controller is adopted, responses of forward and reverse motions are identical; by means of signal conversion, the load flow model of the asymmetric system is established, and the purposes of transfer function converting and model converting are achieved, and a new established system model serves as a symmetric load flow model. The achieving method comprises the steps that a reference signal symmetrical to a proportional valve is given, after a signal is converted, a new input signal of the proportional valve is obtained, and proportional valve is controlled to work, so that load flows of the asymmetric electric-hydraulic proportional system in a proportional valve linear region in the forward motion and the reverse motion is identical; by means of the method, an asymmetric effect is eliminated by an asymmetric factor of the system through mathematical conversion, and the identical response of the asymmetric electric-hydraulic proportional system is achieved simply and intelligently.

Description

technical field [0001] The invention belongs to the technical field of machinery and electronics, and relates to a control method of an asymmetric electro-hydraulic proportional system based on model conversion. Background technique [0002] The hydraulic control system of the 125MN extrusion press adopts the control form of "pilot valve combined with throttle valve", which is essentially a valve-controlled cylinder hydraulic system. When the speed of the movable beam is too large, the opening height of the throttle valve is reduced. When the speed becomes smaller, increase the opening of the throttle valve spool, the system schematic diagram is as follows figure 1 shown. [0003] The field application shows that the characteristics of the throttle valve spool in the two directions of opening and closing are different. The opening process of the spool is very slow, the closing speed is very fast, and the dynamic characteristics are asymmetrical, mainly manifested in stabili...

Claims

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Application Information

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IPC IPC(8): F15B9/03
CPCF15B13/02F15B19/005F15B19/007
Inventor 谭建平曾乐许文斌
Owner CENT SOUTH UNIV
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