Anti-interference filtering method and device for high-precision household ultrasonic water meter

Abstract

The invention discloses an anti-interference filtering method for a high-precision household ultrasonic water meter. The method comprises the following steps of collecting the time difference signals of downstream and countercurrent when water is stopped, calculating the absolute values of slopes between the time difference signals of adjacent sampling points, calculating a mean value Kj average of the absolute values of the slopes of the time difference signals, selecting a proper judgment threshold value delta, if Kj average is smaller than delta, using the improved smoothing filtering, if Kj average is larger than delta, using the Kalman filtering, calculating a final time difference signal delta Tfinal filtered within the whole sampling time T, and adopting the delta Tfinal to participate in the calculation for compensating or offsetting non-zero flow. The high-precision household ultrasonic water meter adopts the anti-interference filtering method for the high-precision household ultrasonic water meter to carry out anti-interference filtering. By means of the method, the influence of interference of bubbles, zero drift, impurities and the like on the flow measurement in the using process of the household ultrasonic water meter can be effectively filtered out in real time, and the flow measurement error of the household ultrasonic water meter is reduced.

Description

technical field [0001] The invention relates to the technical field of intelligent metering, in particular to an interference filtering method and equipment for a high-precision household ultrasonic water meter. Background technique [0002] Compared with traditional mechanical water meters, ultrasonic water meters have the advantages of no mechanical transmission, wide range ratio, and low pressure loss. It is the direction of fully electronic water meters. Household ultrasonic water meters realize the miniaturization of ultrasonic water meters, popularize residential water use, and bring technological innovation and development to the water metering industry. However, due to the small diameter and short ultrasonic flight time of the household ultrasonic water meter, the flow is affected by the interference of air bubbles, zero drift, impurities, etc., and there is a prominent problem of large flow measurement errors. [0003] In order to solve the problem of large flow me...

AI Technical Summary

Problems solved by technology

However, the field environment of the household ultrasonic water meter is complex and changeable, and it is difficult to ensure that it is the same as the laboratory operating environment, which leads to the inability to accurately calibrate the flow measurement error value.

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