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Control method enabling minimum operating time of batch process in controller asynchronous switching

A technology of running time and control method, applied in the information field, can solve problems such as long running time of intermittent processes and difficulties in efficient operation, and achieve the effect of reducing system state escape, reducing process running time, and promoting efficient production and operation

Active Publication Date: 2016-05-25
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the deficiencies in the prior art above, the present invention provides a method for controlling the minimum running time of the intermittent process with asynchronous switching of controllers, which solves the problems of long running time and difficulties in efficient operation of the intermittent process in the prior art

Method used

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  • Control method enabling minimum operating time of batch process in controller asynchronous switching
  • Control method enabling minimum operating time of batch process in controller asynchronous switching
  • Control method enabling minimum operating time of batch process in controller asynchronous switching

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Embodiment

[0092] 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 relates to a control method enabling minimum operating time of a batch process in controller asynchronous switching. The method includes the following steps that: step 1, a hybrid state space model is established according to a discrete state space model; step 2, a two-dimensional iterative learning controller is designed, so that a two-dimensional closed-loop hybrid state space model of the batch process can be obtained; and step 3, controller gain, minimum dwell time of a stable stage and maximum dwell time of an unstable stage which enable optimal control performance for a system are calculated. With the control method of the invention adopted, the average dwell time of a stable subsystem of the batch process can be minimum under the premise that optimal control performance of the batch process can be ensured, and unnecessary process operating time can be decreased; and the maximum average dwell time of an unstable subsystem can be obtained, so that ahead-of-time switching measures can be taken, and therefore, system state escape caused by a situation that controller switching lags behind process switching can be decreased; and operating time can be further decreased, time cost can be reduced, and production efficiency can be increased substantially.

Description

technical field [0001] The invention belongs to the field of information technology, and in particular relates to a method for controlling the minimum running time of an intermittent process with asynchronous switching of controllers. Background technique [0002] As the first choice for the production of multi-variety, small-batch, high-value-added products, the batch process occupies a high proportion in my country's industrial production system. The batch process obtains a large number of identical products through the repeated production of batches, so that the batch process has certain repetitive characteristics; between different batches, the dynamic characteristics of the batch process are not completely repeated, so its dynamics have a rapid 2D features that evolve and evolve slowly between batches. [0003] Batch processes produce products through multiple stages of processing within each batch and are of a multi-stage nature. Due to different purposes and differe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCY02P90/02G05B19/41885
Inventor 王立敏于晶贤朱城杰姜凤利
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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