A Method of Converting Continuous Time Filters to Discrete Time Filters

A time filter, discrete-time technology, applied in instruments, adaptive control, control/regulation systems, etc., can solve problems such as inconvenience for designers, achieve excellent performance and save system design and development time.

Active Publication Date: 2015-09-02
WISDRI ENG & RES INC LTD
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  • Claims
  • Application Information

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Problems solved by technology

At present, there are special design methods for discrete-time filter design, but the basis of those design methods is the discrete-time controlled object model, and the filter characteristic design must also be converted into the form in the discrete system, which often brings inconvenient

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  • A Method of Converting Continuous Time Filters to Discrete Time Filters
  • A Method of Converting Continuous Time Filters to Discrete Time Filters
  • A Method of Converting Continuous Time Filters to Discrete Time Filters

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Embodiment Construction

[0023] figure 1 It is a flowchart of an embodiment of the present invention, which includes the following steps: S1, sampling the input and output of the controlled system, and utilizing the identification algorithm to obtain the continuous-time model of the system; S2, constructing a continuous-time filter according to the continuous-time model; S3 . According to the coefficients in the continuous-time filter equation and the adoption time of the discrete system, a partial differential equation method is used to calculate the discrete-time filter coefficient matrix; S4. Constructing a discrete-time filter structure.

[0024] In step S1, the continuous time model is x · ( t ) = Ax ( t ...

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Abstract

The invention provides a method for transforming a continuous-time filter to a discrete-time filter. The method includes: sampling input quantity and output quantity of a controlled system, and utilizing an identification algorithm for obtaining a continuous-time model of the system; constructing the continuous-time filter according to the continuous-time model; adopting a partial differential equation method to compute a coefficient matrix of the discrete-time filter according to coefficients in a continuous-time filter equation and adopted time of a discrete system; and constructing a discrete-time filter structure. The discrete-time filter is obtained by performing discrete transformation to the designed continuous-time filter. Compared with an existing discrete-time filter design method, the method has the advantages that discretization processes of a controlled object and filter designing processes based on the discrete system are decreased, and by utilizing advantages of a filter design theory based on a continuous-time system, the filter excellent in performances can be designed, system design and development time can be saved, and the method is particularly suitable for practical engineering application of digital control systems.

Description

technical field [0001] The invention relates to the design field of industrial automatic control systems in the iron and steel metallurgy industry, in particular to a method for converting a continuous time filter into a discrete time filter. technical background [0002] Both classical control theory and modern control theory take the continuous-time model as the research object. Many mature filter design theories are also designed based on the continuous-time filter structure. Now that we have entered the era of digital control, continuous-time filters require Converting to discrete time form can be applied in practice. At present, there are special design methods for discrete-time filter design, but the basis of those design methods is the discrete-time controlled object model, and the filter characteristic design must also be converted into the form in the discrete system, which often brings inconvenient. Contents of the invention [0003] The technical problem to be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/00
Inventor 张华军谢德华
Owner WISDRI ENG & RES INC LTD
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