A Time Sampling Method of Ultrasonic Gas Meter Aiming at the Effect of Pulsating Flow

Abstract

The invention provides a time sampling method of an ultrasonic gas meter aimed at the influence of pulsating flow. The non-metering time t in the acquisition cycle (500ms) i Divided into 4 equal parts on average e , when the data update cycle (2s) starts, declare an array T val =[0,1,2,3], respectively means waiting for 0×t e , 1×t e , 2×t e , 3×t e Time to start metering sampling. The waiting time of each cycle is determined by a random algorithm, and the instantaneous flow value obtained after the sampling of the collection cycle is completed is obtained. The instantaneous flow value is sorted by using the bubble sorting method, and the first n (n≤N) maximum values ​​and the first n The minimum value, calculate the instantaneous flow output of the data update cycle. The method provides a set of software random algorithms for the time sampling of the ultrasonic gas meter, which can make the ultrasonic gas meter output accurate and stable flow rate, and can avoid the problem of inaccurate measurement of the ultrasonic gas meter caused by artificially adding pulsating flow devices.

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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