Low-pass filtering method and device

Abstract

The invention discloses a low-pass filtering method and device, and the method comprises the steps: multiplying a to-be-processed signal by a preset first constant -1.6 to obtain a first output signal; continuously performing the first-order inertial inverse operation of the to-be-processed signal for four times; calculating a sum of the first output signal, a second output signal, a third outputsignal, a fourth output signal, and a fifth output signal; performing a fourth-order inertial operation of a sixth output signal, and taking a seventh output signal as a subtracted input signal of thesubtraction operation; taking an output signal of the subtraction operation as an eighth output signal, and continuously performing the first-order inertial operation of the eighth output signals forfour times through a preset first-order inertial operation formula; calculating the sum of a ninth output signal, a tenth output signal, an eleventh output signal and a twelfth output signal, and taking a thirteenth output signal as a subtraction input signal of the subtraction operation; multiplying an output signal of the subtraction operation by a preset second constant 2.08333 to obtain low-pass filtering output signal. The method and device are used for improving the stability margin of a high process control loop.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a low-pass filtering method and device. Background technique [0002] Signal filtering method is an important part of control theory. In the study of control theory, the research on signal filtering method is always an important issue. The filtering method is also a basic component of various process control systems, and the quality of the filtering method is also an important factor in determining the performance of the process control, such as the lag of the filtering phase and time. In process control, inertial filters, such as first-order inertial filters and second-order inertial filters, are widely used in filtering and denoising because of their simple structure. However, inertial filters have the problem of filtering phase lag, which will cause process The control loop stability margin decreases, so there is a need for a method that can increase the process con...

AI Technical Summary

Problems solved by technology

In process control, inertial filters, such as first-order inertial filters and second-order inertial filters, are widely used in filtering and denoising because of their simple structure. However, inertial filters have the problem of filtering phase lag, which will cause process The control loop stability margin decreases, so a method is needed to increase the process control loop stability margin

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