Speed sensor anti-interference pulse counting method and device

Abstract

The invention discloses a speed sensor anti-interference pulse counting method. The method comprises the steps of: selecting first phase input pulse signals output by a speed sensor, and inverting the first phase input pulse signals to obtain first phase input pulse inverted signals; respectively generating a short pulse on rising edges of each first phase input pulse signal and each first phase input pulse inverted signal so as to form first short pulse signals and second short pulse signals; carrying out logic and operation respectively between the first short pulse signals and second phase input pulse signals and between the second short pulse signals and the second phase input pulse signals, and respectively forming first column counting pulse signals and second column counting pulse signals; respectively counting the first column counting pulse signals and the second column counting pulse signals, and using the difference of two counting values as a pulse counting value of the speed sensor. The invention further discloses a speed sensor anti-interference pulse counting device. According to the invention, the accurate pulse counting values can be obtained, the speed measurement and positioning precision is improved, and train operation safety risks caused by inaccurate speed measurement can be prevented.

Description

technical field [0001] The invention relates to the field of rail transit signal systems, in particular to a speed sensor anti-interference pulse counting method. The invention also relates to a speed sensor anti-interference pulse counting device. Background technique [0002] The rail transit signal system needs to realize the functions of train speed measurement and positioning. At present, most of the rotary encoder speed sensors are used. The principle is an incremental rotary encoder after photoelectric or magnetoelectric conversion, which can output two or Multiple quadrature pulse signals. In the prior art, in order to improve the accuracy and precision of the speed measurement when processing the speed sensor, more anti-interference measures such as filtering and hysteresis comparison on the hardware circuit are carried out. However, there are certain uncertainties in the hardware circuit, and the harsh electromagnetic environment is susceptible to external interf...

AI Technical Summary

Problems solved by technology

However, there is a certain degree of uncertainty in the hardware circuit, and it is susceptible to external interference in harsh electromagnetic environments. At the same time, the filter bandwidth boundary is fuzzy, and it cannot fully guarantee that the final speed signal input to the processor is perfect and glitch-free.

When there are signal glitches, this will cause the speed measurement pulse count to increase than the actual, and the speed measurement error will increase

In turn, it may lead to unnecessary overspeed EB (emergency braking) of the train, which will affect the operating efficiency and even lead to safety accidents

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