Constrained Rolling Time Domain Hybrid Tracking Control Method for Batch Injection Molding Process
A tracking control, rolling time domain technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve problems such as control performance decline, controller gain cannot be adjusted, and economic benefit of control system is reduced.
Active Publication Date: 2021-05-07
HAINAN NORMAL UNIV
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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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[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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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. In this method, the input and output models of different stages are first established by collecting input and output data, and then the appropriate state variables are selected to establish a multi-stage state space model. The system model is expressed, and then the performance index including the terminal state is selected for different stages, and the optimal hybrid control law is obtained by combining the Riccati equation and boundary conditions. By adding adjustable weighting coefficients, the control law can be adjusted more flexibly and ensure better control performance of the system. Finally, for different stages, a dwell time method based on Lyapunov function is designed. The result obtained by this method does not need to refer to any other variables.
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...
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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 王立敏罗卫平余维燕王鹏
Owner HAINAN NORMAL UNIV