CN-122015998-A - Water gauge liquid level detection method and system for low-temperature frozen water body

CN122015998ACN 122015998 ACN122015998 ACN 122015998ACN-122015998-A

Abstract

The invention belongs to the technical field of water level detection control, and provides a water gauge liquid level detection method and system for low-temperature frozen water, comprising the steps of obtaining environmental parameters of the low-temperature frozen water; the method comprises the steps of acquiring environment parameters, identifying the environment type of a low-temperature frozen water body, calculating the thickness of an ice layer when the environment type is an icing mode, and finishing water gauge liquid level detection of the low-temperature frozen water body, wherein ultrasonic sound velocity temperature drift and water turbidity attenuation are considered, ice water sound velocity is corrected based on temperature correction parameters, ice water sound path is corrected based on sound Cheng Xiuzheng parameters, adaptive fusion of the temperature correction parameters and the sound correction parameters is carried out by combining dynamic weight factors, and the thickness of the ice layer is obtained by combining the reflection characteristics of ultrasonic signals at an ice-water interface. The invention realizes the accurate monitoring of the water tank liquid level in the whole temperature range of the low Wen Jiebing water body based on the self-adaptive processing logic of environmental parameter acquisition, self-adaptive switching of the model, ice layer interference elimination, low temperature performance compensation and accurate liquid level calculation.

Inventors

XU TONGMING
Shang Shoubo
LAN YUNZHOU
LIN YONGWEN
LI BOZHAO
ZHOU JIANHUI

Assignees

浪潮通用软件有限公司

Dates

Publication Date: 20260512
Application Date: 20260104

Claims (10)

1. The utility model provides a water gauge liquid level detection method of low temperature frozen water body which characterized in that includes: Acquiring environmental parameters of a low-temperature frozen water body; Based on the acquired environmental parameters, identifying the environmental type of the low-temperature frozen water body; When the identified environment type is in an icing mode, calculating the thickness of an ice layer, and finishing the water gauge liquid level detection of the low-temperature icing water body; In the process of calculating the thickness of the ice layer, the ultrasonic sound velocity temperature drift and the water turbidity attenuation are considered, the ice water sound velocity is corrected based on the temperature correction parameter, the ice water sound path is corrected based on the sound Cheng Xiuzheng parameter, the temperature correction parameter and the sound path correction parameter are adaptively fused by combining the dynamic weight factor, and the thickness of the ice layer is obtained by combining the reflection characteristic of an ultrasonic signal at an ice-water interface.
2. A method of water gauge level detection for a body of low temperature ice water as recited in claim 1, wherein the type of environment of the body of low temperature ice water includes at least ice presence and ice absence.
3. The method for detecting the water gauge liquid level of the low-temperature frozen water body according to claim 2, wherein in the process of identifying the environment type of the low-temperature frozen water body, a dual-parameter intelligent identification logic of temperature pre-judgment risk and ultrasonic verification ice layer is adopted, the average environmental temperature and the threshold environmental temperature in the acquired environmental parameters are compared, whether the low-temperature frozen water body is at risk of freezing is judged, when the risk of freezing is at risk of freezing, the ultrasonic reflection time difference and the threshold time difference in the acquired environmental parameters are compared, and whether the low-temperature frozen water body at risk of freezing is identified.
4. A method of detecting the water level of a body of ice water at low temperature as recited in claim 1, wherein the ultrasonic sound velocity varies with temperature and the sound velocity in ice is corrected Is that Sound velocity correction in water Is that Wherein, the method comprises the steps of, Is the ambient average temperature.
5. The method for detecting the water gauge liquid level of a low-temperature frozen water body as recited in claim 4, wherein the ultrasonic sound path generates signal attenuation due to suspended particles in the water body propagation process, and the attenuation correction is performed on the ultrasonic sound path based on an attenuation coefficient, namely Wherein, the method comprises the steps of, To correct the actual sound path in the ice, For a theoretical sound path in unmodified ice, Is the attenuation coefficient.
6. A method for water gauge level detection in a body of low temperature ice water as recited in claim 5, wherein said ice layer has a thickness Is that Wherein, the method comprises the steps of, For the second time of the ultrasound reflection, For the first time of the ultrasound reflection, For the weight of the ultrasonic signal, The weights are corrected for temperature.
7. The method for detecting the water gauge liquid level of a low-temperature frozen water body according to claim 1, wherein the performance attenuation trend of the sensor is predicted by combining a sensor performance attenuation prediction model of an LSTM neural network through the association relation of quantized temperature and sensor performance in consideration of sensor performance attenuation, so that a passively corrected hysteresis error is avoided.
8. A method for detecting the level of a water gauge in a body of low temperature ice as recited in claim 7, wherein said sensor comprises a pressure sensor, and wherein the pressure sensor compensation comprises sensitivity compensation and zero drift compensation, namely , Wherein, the method comprises the steps of, For the temperature corrected pressure sensor sensitivity, Is the standard sensitivity at normal temperature, As the sensitivity decay coefficient, As the average temperature of the environment is the temperature, The zero drift amount of the pressure sensor after temperature correction.
9. A method of water gauge level detection for a body of low temperature ice water as recited in claim 7, wherein said sensor further comprises a capacitive sensor, and wherein capacitive sensor compensation comprises capacitance drift compensation and threshold adjustment; , Wherein, the method comprises the steps of, For the compensated capacitance of the ith capacitive sensor, For the measured capacitance value of the ith capacitive sensor, As the average temperature of the environment is the temperature, For the temperature corrected capacitance value change threshold value, Is a standard threshold at normal temperature.
10. A water gauge level detection system for a low temperature frozen body of water, comprising: An acquisition module configured to acquire an environmental parameter of a low-temperature frozen body of water; an identification module configured to identify an environmental type of the low-temperature frozen water body based on the acquired environmental parameter; the detection module is configured to calculate the thickness of the ice layer and complete the water gauge liquid level detection of the low-temperature frozen water body when the identified environment type is in the icing mode; In the process of calculating the thickness of the ice layer, the ultrasonic sound velocity temperature drift and the water turbidity attenuation are considered, the ice water sound velocity is corrected based on the temperature correction parameter, the ice water sound path is corrected based on the sound Cheng Xiuzheng parameter, the temperature correction parameter and the sound path correction parameter are adaptively fused by combining the dynamic weight factor, and the thickness of the ice layer is obtained by combining the reflection characteristic of an ultrasonic signal at an ice-water interface.

Description

Water gauge liquid level detection method and system for low-temperature frozen water body Technical Field The invention belongs to the technical field of water level detection control, and particularly relates to a water gauge liquid level detection method and system for a low-temperature frozen water body. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. In the existing open water liquid level detection, aiming at the pressure-capacitance combination detection technology of normal-temperature icing-free scenes, an upper pressure sensor, a lower pressure sensor and a capacitance measurement matrix are combined, measurement errors caused by different water density differences are solved through density self-adaption correction, and aiming at the existing treatment technology of low-temperature icing scenes, the traditional pressure detection technology without ice layer compensation (a normal-temperature pressure-liquid level calculation formula is directly adopted) and the ice layer ablation technology relying on electric heating wires (the ice layer on the surface of the sensor is eliminated through heating so as to maintain the detection function) are adopted. The prior art has the following defects in liquid level detection of low-temperature frozen water bodies (generally the ambient temperature is less than or equal to 2 ℃): (1) The pressure measurement is distorted, and the extra pressure generated by the ice layer is counted into the water pressure, so that the measured value of the liquid level is 50% -200% higher than the actual value; (2) The capacitance positioning is invalid, the dielectric constants of the ice layer and the water body are extremely different, the capacitance measurement matrix misjudges the 'ice layer coverage' as 'liquid level arrival', and the liquid level preliminary positioning cannot be realized; (3) The low-temperature performance of the sensor is attenuated, the sensitivity of the pressure sensor is attenuated by 20% -30% below-10 ℃, the capacitance value of the capacitive sensor drifts by more than 15%, and the measurement error is further amplified; (4) The heating and deicing technology has contradiction between energy consumption and maintenance, the daily average energy consumption is 3-5 times of that of a normal temperature scene, the heating wire is easy to break due to water quality corrosion, and the maintenance frequency is improved by 50%. The low-temperature icing water body liquid level detection defect is caused by the fact that no adaptation design is carried out on physical characteristics of a low-temperature icing scene and a sensor working mechanism, and the method is specific to the following steps: (1) The root cause of the pressure distortion is that the prior art does not establish an ice layer-water body double-medium identification mechanism, does not distinguish the ice layer pressure from the water body pressure, directly applies a pressure-liquid level formula of a single medium, and ignores the extra pressure generated by taking the ice layer as an independent medium; (2) The root cause of the capacitor positioning failure is that the prior art does not consider the obvious difference of the dielectric constants of ice and water, and does not adjust the capacitance value change threshold value of the capacitor aiming at the low-temperature environment, so that the dielectric environment change causes misjudgment; (3) The root of the attenuation of the low-temperature performance of the sensor is lack of a temperature-performance compensation model in the prior art, and the sensor is not calibrated for the changes of physical characteristics such as sensitivity, zero drift, solution drift and the like of the sensor at low temperature; (4) The heating and deicing technology contradiction is based on the idea of 'by animal reason ablation', the ice layer interference is not eliminated from the detection principle level, the problem is temporarily relieved only by means of high energy consumption, and the essential contradiction of the ice layer interference is not solved. Therefore, the existing low-temperature frozen water liquid level detection is needed to solve the problems that an ice layer and water pressure cannot be distinguished and ice and water dielectric constant difference is ignored due to the fact that an ice layer identification mechanism is not designed in the conventional low-temperature frozen water liquid level detection scheme, measurement distortion and capacitance positioning failure are caused due to lack of sensor low-temperature compensation, in addition, interference is eliminated from a detection principle due to the fact that the ice layer is heated and ablated by means of high-power consumption in a heating and ice melting scheme, and a heating wire is easy to be corroded by water quality, so that energy