2d Input-Output Constrained Control Method for Delay-Dependent Batch Processes

A technology of constraint control, input and output, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve problems such as affecting system stability, deteriorating system control performance, etc., achieving smooth curve, fast convergence speed, tracking The effect of small error values

Active Publication Date: 2022-03-08
HAINAN NORMAL UNIV
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Problems solved by technology

The reason is that if the design of the controller does not consider the restrictions on input and output, it is very likely to reach a saturated state and cannot be changed, thereby deteriorating the system control performance and even affecting the stability of the entire system

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  • 2d Input-Output Constrained Control Method for Delay-Dependent Batch Processes
  • 2d Input-Output Constrained Control Method for Delay-Dependent Batch Processes
  • 2d Input-Output Constrained Control Method for Delay-Dependent Batch Processes

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Embodiment

[0156] The invention takes the injection molding process as a representative to carry out the experiment of the batch process with uncertain disturbance and state time lag. The injection molding process is a typical batch process, which mainly includes three stages: injection stage, pressure holding stage and cooling stage. In the pressure holding stage, the key variable is the cavity pressure, which must be controlled according to the pre-set trajectory to ensure the quality of the product. Changes in working conditions such as molds, materials, and dynamic characteristics of hydraulic actuators will make the pressure-holding stage an intermittent process with uncertain disturbances. In the pressure-holding stage, traditional iterative learning controllers (hereinafter referred to as ILCs) such as P-type ILCs are not applicable. On the other hand, when using slow pressure valves, the control performance tends to be poor. Pure feedback control, such as proportional-integral-...

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Abstract

The present invention provides a time-delay-dependent intermittent process 2D input-output constraint control method, which belongs to the field of advanced control of industrial processes and includes the following steps: Step 1. For a single stage in the intermittent process, establish the controlled object based on the state space model The two-dimensional system model with state time delay, step 2, design iterative learning predictive controller for the two-dimensional closed-loop system model constructed in step 1.3; the advantages of the present invention are: the tracking error value is small, the convergence speed is fast, and it can be used in About 10 batches quickly converge to a stable state. After reaching a stable state, the curve of the tracking error is smooth and close to zero error; it can track the reference trajectory set above in a very short period of time, and the rate of change is significantly greater than that of the traditional one. dimensional method, and the curve response is more sensitive when the system changes suddenly.

Description

technical field [0001] The invention belongs to the field of advanced control of industrial processes, and relates to a 2D input-output constraint control method for a time-delay-dependent intermittent process. Background technique [0002] Batch process is an industrial production process that uses one or more equipment to process given raw materials into products within a specified time according to specified production requirements and fixed processing procedures. In recent years, with the development and research of products in the fields of fine chemicals, biopharmaceuticals, and metal processing, batch processes have attracted extensive attention from industry and academia. [0003] Time lag exists and is unavoidable in the intermittent process, and time lag can be roughly divided into input time lag, output time lag and state time lag. The existence of time lag will have a serious impact on the stability of the system, will lag the response speed of the system, incre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/0265G05B13/045G05B13/048
Inventor 朱琳王浩森王润泽曹可大张渝新王立敏王鹏
Owner HAINAN NORMAL UNIV
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