Filtering method for improving differential calculation stability of control system

Abstract

The invention discloses a filtering method for improving differential calculation stability of a control system. The filtering method comprises the following steps: acquiring an input signal jitter range when the system is stable; designing a filtering mode according to the signal jitter range, including a high threshold value and a low threshold value, wherein the high threshold value is equal tothe output value plus the fluctuation value, and the low threshold value is equal to the output value fluctuation value; enabling a system to operate, and obtaining an input signal acquisition valuefor judgment: when the acquired input signal acquisition value is data acquired for the first time, output is directly initialized, when the acquired input signal acquisition value is not data acquired for the first time, updating output is carried out, and high threshold value and low threshold value updating of the currently acquired data is carried out according to the new output value. Compared with a common filtering method, the filtering method can stabilize the output value when the input signal is stable or changes in a small range, and can completely track the change rate of the inputsignal when the range of the input signal changes. The filtering method can be combined with other filtering modes, and differential calculation stability is provided when the system is stable.

Description

technical field [0001] The invention relates to a filtering method for improving the differential calculation stability of a control system, and belongs to the technical field of digital signal processing methods. Background technique [0002] The information acquired by the control system from the outside is actually the superimposed information of the original information, noise information, quantization error and other signals, which generally need to be filtered. The filtering process is actually the process of restoring the original information from the superimposed information. When designing a control system, in addition to taking anti-interference measures in the hardware, it is also necessary to perform digital filtering through software, so that the collected data can truly reflect the actual situation and approach the real value. [0003] In the control system, the rate of change of the input signal is often used to participate in the control operation, and the r...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art. Aiming at the problem that the noise signal has a particularly large influence on the differential term when the original signal in the traditional control system is stable or changes in a small range, and the traditional filtering method cannot eliminate the influence, a method for improving the control system is proposed. A Filtering Method for Differential Calculation Stability

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