Limited rolling time-domain hybrid tracking control method for batch injection molding process

A technology of tracking control and rolling time domain, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of reducing the economic benefit of the control system, the decline of control performance, and the inability to adjust the gain of the controller

Active Publication Date: 2018-04-20
HAINAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are certain research results for multi-stage, the controller gain cannot be adjusted in the whole process
In actual industrial control, due to factors such as drift in actual working conditions, process nonlinearity, and external interference of the system, the control performance of the control system may decline after a period of operation.
If the controller is not repaired in time to improve the control quality, it will reduce the economic benefits of the control system

Method used

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  • Limited rolling time-domain hybrid tracking control method for batch injection molding process
  • Limited rolling time-domain hybrid tracking control method for batch injection molding process
  • Limited rolling time-domain hybrid tracking control method for batch injection molding process

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Embodiment

[0122] The injection molding process is a typical batch production process, and each batch mainly includes three steps, namely injection section→pressure holding section→cooling section. In the injection section, the screw moves forward to extrude the melt stored at the front end of the barrel (the raw material is heated by the heating ring) forward, flows through the runner, the runner, the gate, and enters the closed mold cavity ( inside the mold cavity). When the cavity is completely filled, the molding process switches from the injection section to the pressure holding section. In the pressure-holding section, the screw advances at a very low speed to maintain a certain nozzle pressure. A small amount of melt continues into the mold cavity, compensating for volume shrinkage due to cooling and solidification of the material. Once the gate with the smallest cross-sectional area in the mold is substantially solidified, the packing section stops and the process enters the co...

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Abstract

The invention belongs to the advanced control field of the industrial process and relates to a limited rolling time-domain hybrid tracking control method for a batch injection molding process. Input and output data are collected to establish input and output models at different stages; a multi-stage state space model is established by selecting proper state variables, the state space model is further converted to an extended state space model containing state variables and output tracking errors, and the model is expressed by a switching system model; and performance indexes including terminalstates are selected for different stages and an optimal hybrid control law is calculated by combining a Riccati equation and a boundary condition. The control law has an added adjustable weighting coefficient, so that adjustment becomes flexible and the system obtains the improved control performance. At different stages, a residence time method depending on the Lyapunov function is designed; andthe result obtained by the method does not need to introduce any other variables, so that the method becomes simple and is easy to implement and the system operation time is shortened and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of advanced control of industrial processes, and relates to a limited rolling time-domain mixed tracking control method in a batch injection molding process. Background technique [0002] The injection molding process is widely used in plastic processing and other related fields. Although there have been some studies on the injection molding process, it is still a challenge in the high-precision control of modern plastic processing. The main reason lies in its complex dynamic characteristics and changing process conditions. The injection molding process is a typical multi-stage batch process. Each batch mainly includes two stages of injection and pressure holding. The variables that need to be controlled in the injection section and pressure holding section are injection speed and holding pressure respectively. Different variables, different control objectives, when to switch from one stage to another, and the length...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 王立敏罗卫平余维燕王鹏
Owner HAINAN NORMAL UNIV
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