Signal filtering method, device and system and readable medium

Abstract

The invention discloses a signal filtering method, device and system and a readable medium, and the method comprises the steps: collecting a target voltage signal according to a preset collection frequency, and obtaining original voltage values in a plurality of filtering periods; for each filtering period except the first filtering period, filtering out an original voltage value meeting a credible condition from a plurality of original voltage values acquired in the filtering period, wherein the credible condition comprises that the difference value between the original voltage value and theoutput voltage value of the previous filtering period is smaller than a credible change threshold value; selecting the maximum value from the original voltage values meeting the credible condition inthe filtering period to serve as the output voltage value of the filtering period; and arranging the output voltage values of each filtering period according to a time sequence to obtain a filtered target voltage signal. According to the embodiment of the invention, the original voltage value meeting the credible condition is filtered out by using the credible condition, so that relatively large burrs in the target voltage signal are filtered out because the credible condition is not met.

Description

technical field [0001] The present application relates to the technical field of signal filtering, and in particular to a signal filtering method, device, system and readable medium. Background technique [0002] During the process of installing the engine equipment of the vehicle, the rail pressure sensor is often affected by electromagnetic interference due to the high voltage effect of the DC buck. When the rail pressure sensor is subjected to electromagnetic interference, the voltage signal sent to the engine electronic control unit (Electronic Control Unit, ECU) usually has a large glitch. [0003] In the prior art, in order to obtain an accurate voltage signal of the rail pressure sensor, the ECU usually uses a ten-point peak filtering method to filter the voltage signal of the rail pressure sensor. The ten-point peak filtering method collects a value every 1ms, and then selects a maximum value from the ten values ​​collected every 10ms as the output value of this per...

AI Technical Summary

Problems solved by technology

Therefore, the existing ten-point peak filtering method cannot filter out the larger burrs in the voltage signal, resulting in inaccurate voltage signals obtained by the ECU.

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