Digital filtering method with low resource consumption
A technology of resource consumption and digital filtering, applied in the direction of digital technology network, impedance network, electrical components, etc., to achieve the effect of occupying less resources
Active Publication Date: 2015-05-27
SHENYANG NORTHEAST ELECTRIC POWER CONTROL
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[0005] In view of this, the present invention provides a digital filtering method with low resource consumption, which solves the problem of balance between the effect of analog low-pass filtering and resource occupation in the process of automatic control of industrial equipment realized by small microcontrollers
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[0018] In order to make the purpose, technical solution and advantages of the present invention clearer and clearer, the present invention will be further described in detail below by taking the application of the method of the present invention in the "controller of steam extraction adjustment valve" as an embodiment and referring to the accompanying drawings.
[0019] One working mode of the extraction steam adjustment valve is "remote control", that is, the central control room controls the extraction steam adjustment valve through the analog "control command", and the extraction steam control valve controller receives the "control command" from the central control room and Real-time detection of the analog "valve position feedback signal" from the steam extraction adjustment valve for control processing. Because these two signals are analog quantities, they are inevitably subject to various interferences during transmission, so filtering must be performed.
[0020] After t...
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The invention relates to the field of industrial automatic control, in particular to a digital filtering method with low resource consumption. The method comprises steps as follows: filtering relevant parameters are set, a sampling value after each sampling is acquired through N times of sampling, and N is a natural number; when a first sampling value is detected, the first sampling value is directly used as first filtering output; as for sampling values excluding the first sampling value, whether a difference value between a current sampling value and the last sampling value is in a sampling value relative change range is judged; if yes, weighted average calculation is performed on the current sampling value and the last sampling value, and current filtering output is acquired; otherwise, the current sampling value is taken as the current filtering output or transferred to the next filtering output for calculation according to a processing strategy of sampling values beyond the normal range. The method has the advantages of small occupation resources and capability of preventing memory overflow and is applicable to small controllers and microcontrollers in most industrial environments.
Description
technical field [0001] The invention relates to the field of industrial automatic control, in particular to a digital filtering method with low resource consumption, which is used for digital filtering of collected analog quantities. Background technique [0002] In the field of industrial automatic control, due to the limitation of the on-site electromagnetic environment, noises of different orders of magnitude are often coupled into the on-site analog signal of the equipment. If the analog signal is not filtered, it will affect the performance and control quality of the system. Usually, it can be used There are two ways of hardware filtering or software filtering for filtering. [0003] Hardware filtering refers to the use of hardware filters to directly filter analog signals. This method is necessary and irreplaceable for simple systems that only use analog circuits. However, when sampling a digital control system, software can also be used to filter the sampled values ...
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IPC IPC(8): H03H17/02
Inventor 刘宝军张弢王学东
Owner SHENYANG NORTHEAST ELECTRIC POWER CONTROL