Rotating speed signal acquisition method and device based on frequency division digital filtering, and storage medium

Abstract

The invention relates to the technical field of signal acquisition, and discloses a rotating speed signal acquisition method and device based on frequency division digital filtering, and a storage medium. The method comprises the following steps: carrying out system clock synchronization processing on a to-be-collected rotating speed signal; carrying out frequency division digital filtering on the rotating speed signal which is synchronously processed by the system clock to obtain a segmented rotating speed signal; performing rotating speed acquisition on the segmented rotating speed signals, and performing moving average filtering on the rotating speed acquisition result of each segment; determining an acquisition error according to the moving average filtering result and the actual frequency of the rotating speed signal to be acquired; according to the acquisition error, frequency interval division of frequency division digital filtering and filtering frequency adjustment are carried out until the acquisition error satisfies a preset condition; and integrating and outputting a rotating speed acquisition result according to the finally determined frequency interval and the corresponding moving average filtering result. According to the invention, the noise of different frequency bands in the rotating speed signal to be collected can be effectively filtered, and the collection precision is greatly improved in combination with the moving average filtering algorithm.

Description

technical field [0001] The present invention relates to the technical field of signal acquisition, in particular to a method, device and storage medium for acquiring a rotational speed signal based on frequency division digital filtering. Background technique [0002] The speed signal belongs to the frequency signal, which has the characteristics of rapid change and easy interference. In the electronic control system, no matter using photoelectric sensor, magnetoelectric sensor or Hall sensor to collect rotational speed signal, rotational speed detection circuit is inevitably disturbed by noise, resulting in signal distortion. [0003] In the speed acquisition system, if the front-end distorted speed input signal is not effectively processed, no matter what method is used at the back end to sample and count the speed signal (currently commonly used speed acquisition methods include pulse direct counting method, pulse time counting method and Pulse time mixed counting method...

AI Technical Summary

Problems solved by technology

In the electronic control system, whether using photoelectric sensors, magnetoelectric sensors or hall sensors to collect speed signals, the speed detection circuit will inevitably be disturbed by noise, resulting in signal distortion

[0003] In the speed acquisition system, if the distorted front-end speed input signal is not effectively processed, no matter what method the back-end uses to sample and count the speed signal (currently commonly used speed acquisition methods include pulse direct counting method, pulse time counting method and Pulse time mixed counting method) will cause a large speed acquisition error

[0004] In the existing design, the processing of the noise in the input speed signal is roughly divided into two types: one is to use the hardware low-pass filter method to filter out the frequency signal higher than the normal speed; The frequency digital filtering method can only filter out the noise above a certain frequency band in the speed acquisition system

The frequency of interference signals that can be filtered out by these two methods is limited, so there will still be a large acquisition error in the speed acquisition of some frequency ranges, which will affect the speed acquisition accuracy

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