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Circular sampling filtering method for frequency quantity

A technology of frequency quantity and circumference, applied in the filtering field of control system sampling, can solve the problems of eccentricity of rotating shaft, change of installation distance, frequency signal output jump, etc.

Inactive Publication Date: 2014-05-07
CHINA NORTH VEHICLE RES INST
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Problems solved by technology

[0004] But in actual use, such as figure 1 As shown, under the condition of severe vibration in the working environment, the rotating shaft that provides the frequency output will often be eccentric, which will cause the installation distance to change, resulting in a jump in the frequency signal output. This is a problem that the original algorithm is difficult to solve.

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  • Circular sampling filtering method for frequency quantity
  • Circular sampling filtering method for frequency quantity
  • Circular sampling filtering method for frequency quantity

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[0022] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] like figure 1 , figure 2 As shown, when the speed measuring gear 1 rotates at a constant speed s, when the speed measuring gear rotates eccentrically due to vibration, resulting in a change in the installation distance, the uniform pulse frequency that should be output will jump, sometimes the frequency is large, sometimes The frequency is small. However, it can be seen through analysis that at a constant speed, no matter whether the speed measuring gear 1 rotates eccentrically or not, the number N of pulses generated by it is constant, and the sum of all pulse periods in one cycle is constant. Therefore, by sampling the pulse frequency of one revolution of the rotating gear, accumulating all the pulse period...

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Abstract

The invention relates to a circumference sampling filtering method for frequency quantity, and belongs to the technical field of sampling filtering of control systems. According to the principle that no matter whether a speed measuring gear is eccentric or not, the sum of the cycles of the frequency quantity output when the speed measuring gear rotates by a circle at a constant speed is a certain value, the circle or the integral multiple of the circle is continuously sampled to obtain the equivalent frequency, so that filtering of frequency quantity jump signals caused by vibration is achieved, and the sampled frequency quantity signals are true and believable.

Description

technical field [0001] The invention relates to the technical field of sampling filtering in a control system, in particular to a circular sampling filtering method for frequency quantities. Background technique [0002] In industrial control, construction machinery control, and automotive electronics, there are a large number of frequency signals that need to be collected. The frequency signal output of the sensor is widely used. In practical applications, there are mainly speed signals (such as engine speed signals, wheel speed signals, motor speed signals, etc.), flow signals (mainly worm gear flow sensor input signals), encoder angle signal etc. Generally speaking, the frequency quantity is a fast-changing switching quantity, and its changing frequency is generally several hertz to tens of thousands of frequency. Therefore, the focus of the control system sampling is the switching rate of high and low levels. time to measure frequency quantities. [0003] In order to ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D3/028
Inventor 宋慧新邵春鸣马明金昊龙王超
Owner CHINA NORTH VEHICLE RES INST