Ultrasonic gas meter time sampling method aiming at pulsating flow influence

Abstract

The invention provides an ultrasonic gas meter time sampling method aiming at pulsating flow influence. Non-metering time ti in an acquisition period (500ms) is equally divided into four equal parts te; when a data updating period (2s) begins, an array Tval = [0, 1, 2, 3] is declared, which means that metering sampling is started after 0 * te, 1 * te, 2 * te and 3 * te time of waiting respectively; the waiting time of each period is determined through a random algorithm, obtained instantaneous flow values after the sampling of the acquisition period is completed are obtained; the obtained instantaneous flow values are sorted through a bubbling sorting method; the first n maximum values and the first n minimum values are taken, wherein n is smaller than or equal to N; and instantaneous flowoutput by the data updating period is calculated. According to the method, a set of software random algorithm is provided for the time sampling of an ultrasonic gas meter, so that the ultrasonic gasmeter can output accurate and stable flow, and the problem that the ultrasonic gas meter is inaccurate in metering due to the fact that a pulsating flow device is additionally arranged externally andmanually can be solved.

Description

technical field [0001] The invention belongs to the field of intelligent instrument control, and in particular relates to a time sampling method of an ultrasonic gas meter aimed at the influence of pulsating flow. The method avoids the influence of pulsating flow on the measurement of the ultrasonic gas meter by randomly changing the measurement and sampling sequence of the ultrasonic gas meter. Background technique [0002] With the continuous progress of society and the continuous development of technology, facing the more refined management requirements of the gas industry in the future, traditional mechanical gas meters have poor stability and cannot provide rich gas consumption information, while electronic gas meters, due to Compared with the previous mechanical watches, its all-electronic structure has incomparable advantages in terms of mechanical noise, accuracy, range, repeatability, life, maintenance, and more gas consumption information. Therefore, the metering m...

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Problems solved by technology

[0006] However, there is a periodic cut-off valve installed at the front end of the ultrasonic gas meter on the market. The pulsating flow generated by controlling the switching cycle of the cut-off valve affects the measurement accuracy of the ultrasonic gas meter.

[0007] When the switching period of the cut-off valve is set to around 500ms, during the measurement sampling process, frequent switching of the cut-off valve greatly affects the stability of the air flow, and the average value of the collected instantaneous quantities will become smaller, which will seriously affect the measurement performance.

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