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

Abstract

The invention involves the field of signal collection technology, and a speed signal collection method, device and storage medium based on frequency division digital filtering are disclosed.Methods include: System clock synchronous processing to the collection of speed signals; frequency -frequency digital filtering for the speed signal of the system clock synchronous processing to obtain segmented speed signals;The collection results are performed on average filtering; determine the collection error based on the actual frequency of the sliding average filtering result and the actual frequency of the speed signal to be collected; according to the collection error, the frequency interval division and filtering frequency of frequency differential digital filtering are adjusted until the collection error meets the preset conditions; According to the final determined frequency interval and the corresponding sliding average filter results, the output speed collection results are integrated.The present invention can effectively filter the noise in different frequency bands in the speed signal to be collected, and combine the sliding average filtering algorithm, which greatly improves the collection accuracy.

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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