[Chinese instrument network meter patent] creative limit, instrumentation invention. Today we introduce a national patent for invention invention—an adaptive ultrasonic water meter method for household use. The patent was applied by Liaoning Hangyu Xinglianlian Instrument Technology Co., Ltd. and was authorized to be announced on January 19, 2018.
Content Description
The invention relates to the technical field of measuring instruments, in particular to the accurate measurement of household ultrasonic water meters.
Background of the invention
Ultrasonic transducer immersed in the water after the scaling of the transducer receive signal amplitude has a great impact, when the mixed bubbles in the water, the ultrasound in different media, the conduction gap, the transducer received signal amplitude will be more Large changes, which will indirectly lead to STOP signal wrong wave, affect the measurement accuracy. Therefore, for the long-term use of the meter, to ensure the measurement accuracy within the service life, a self-adjusting method is ready.
The error wave phenomenon is very common and it is important to choose a suitable adaptive method.
Summary of the Invention
The purpose of the present invention is to provide a self-adaptive ultrasonic water meter method, which can more reasonably improve the ultrasonic sampling accuracy in water.

The drawing is a functional block diagram of a specific embodiment of the invention.
The technical solution adopted by the present invention is: in order to prevent the influence of accidental disturbance factors on the method, the method uses the average value of multiple measurements as a judgment basis. After several consecutive measurements, multiple measurements of the upstream time and the downstream time are obtained respectively. The standard upstream time Tup and the downstream time Tdn are calculated using a recursive algorithm. According to the formula Os=(Tdn+Tup)-L*2/C, the normal is calculated. The Os value in the case is preset to the MCU, because Os does not change with the flow rate or temperature, so using this as a standard, Os1 is compared in each measurement, and when Os and Os1 are not equal, an error wave has occurred. When Os>Os1, it means that the threshold is low, and one more wave is used. The threshold is increased by 1mv and measured again. If Os
Before practicing this compensation method, first use the oscilloscope to measure the state when the instrument does not appear wrong wave, record the Tdn, Tup at this time, and calculate the corresponding Os, set as the standard value to the MCU. As shown in the above figure, the specific steps of this control method are as follows: 1. After 10 consecutive measurements, the upstream time and downstream time of 10 measurements are obtained respectively. Go to step 2. 2, using the recursive algorithm to calculate the standard upstream time Tup and downstream time Tdn, jump to step 3. 3, calculate Os1 = (Tdn + Tup)-L * 2 / C, where L is the sound path of the two transducers, C For speed of sound, skip to step 4. 4. Compare Os in the MCU and Os1 in the current measurement. If it is not skip to step 5, skip to step 8. 5. Compare MCUs. The difference between Os and Os1 in this measurement is greater than 0. If it jumps to step 6, if it does not jump to step 7. 6. The threshold increases by 1mv, jump to step 1. 7. The threshold is reduced upwards. 1mv, skip to step 1. 8. End.
The invention has the advantages of effectively reducing the decrease of the ultrasonic amplitude caused by impurities, dirt, bubbles and the like, so as to cause the influence of the wrong wave and the like on the measurement accuracy. The invention improves the measurement accuracy from the software program, reduces the hardware cost, and can greatly reduce the power consumption.
For more information, please download the full specification of the patent.
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