Feed-forward and feedback composite control method for constant-speed heating process of differential scanning calorimeter

A technology of differential scanning calorimetry and constant-speed heating, which is applied to auxiliary controllers with auxiliary heating devices, and uses electric methods for temperature control. It can solve the problem of long adjustment time and poor control accuracy of differential scanning calorimeters. Advanced problems, to achieve the effect of reducing adjustment time, reducing failure rate, and improving control accuracy

Active Publication Date: 2019-02-01
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a feedforward-feedback compound control method for the constant-

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  • Feed-forward and feedback composite control method for constant-speed heating process of differential scanning calorimeter
  • Feed-forward and feedback composite control method for constant-speed heating process of differential scanning calorimeter
  • Feed-forward and feedback composite control method for constant-speed heating process of differential scanning calorimeter

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[0034] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0035] The invention includes two parts: multiple control design and feedforward-feedback compound controller design:

[0036] For nonlinear controlled objects, combined with the decomposition and synthesis rule, the complex nonlinear system is decomposed into multiple linear systems or approximately linear systems near several equilibrium points, and the controller design and controller parameter identification are carried out for each linear system. The controllers of each linear subsystem are combined to form a global controller to realize piecewise linear control of the nonlinear system, that is, the multi-controller method.

[0037] From the perspective of the mechanism of energy transfer and balance in the heating process, there is a one-to-one correspondence between the output of the controller and the heating rate during the heating process of the different...

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Abstract

The invention relates to a feed-forward and feedback composite control method for a constant-speed heating process of a differential scanning calorimeter. The method comprising the following steps of:designing a feed-forward controller to obtain an output value of the feed-forward controller; dividing a temperature space to generate a number of temperature subspaces, and designing furnace temperature PID controllers for the temperature subspaces; collecting and judging the temperature subinterval to which the current temperature measurement belongs, and calculating control parameters of the PID controllers at the current time; calculating the temperature control deviation to obtain output values of the PID controllers; and outputting a temperature control signal to control the temperaturechange in the furnace. According to the feed-forward and feedback composite control method for the constant-speed heating process of the differential scanning calorimeter, the control accuracy of thefurnace temperature control system is improved, and failure rates of thermal analysis experiments by using such instruments are reduced; the feed-forward control amount is added at the control starttime to reduce the adjustment time of the control action and improve the control accuracy by using the characteristic of accuracy control in feed-forward control; and a multi-controller method is proposed to solve the problem of a sudden change of control amount caused by controller switching between different temperature intervals by the smoothing switching factor.

Description

technical field [0001] The invention relates to the field of process control, in particular to a feedforward-feedback compound control method for a constant-speed temperature-rising process of a differential scanning calorimeter. Background technique [0002] Differential scanning calorimeter is a thermal analysis scientific instrument used to measure the relationship between the heat flow difference between the sample end and the reference end as a function of temperature or time under a certain atmosphere and program temperature control. It can quantitatively determine a variety of thermodynamic parameters. , Widely used in materials, food research and development, performance testing and quality control. Its programmed temperature control includes three control methods: linear heating, cooling, and constant temperature. [0003] When using an instrument for thermal analysis experiments, the measured thermodynamic parameters are only accurate and effective under the condi...

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Application Information

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IPC IPC(8): G05D23/32
CPCG05D23/32
Inventor 郁洋邹涛王忠锋魏来星李永民
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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