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CN-121977869-A - Detection method and device for electric water heater and electronic equipment

CN121977869ACN 121977869 ACN121977869 ACN 121977869ACN-121977869-A

Abstract

The invention provides a detection method, a detection device and electronic equipment of an electric water heater, and relates to the field of intelligent home, wherein the method comprises the steps of transmitting a detection signal into a water tank of the electric water heater, receiving an echo signal, wherein the echo signal comprises a plurality of dielectric layer reflection characteristics; and extracting signal characteristics corresponding to preset parameters based on the echo signals, and calculating parameter values according to the extracted signal characteristics, wherein the preset parameters at least comprise scale thickness, water supply pressure and water consumption, and when at least one of the scale thickness, the water supply pressure or the water consumption meets preset abnormal conditions, generating and outputting prompt information. The invention solves the problem that high-precision integrated real-time monitoring cannot be realized due to the dispersion of the functions of detecting the scale, the pressure and the water level of the electric water heater, and realizes non-contact integrated detection and intelligent early warning of the thickness of the scale, the pressure of water supply and the water consumption.

Inventors

  • ZHAO HONGWEI

Assignees

  • 海尔优家智能科技（北京）有限公司

Dates

Publication Date
20260505
Application Date
20251229

Claims (10)

  1. 1. The detection method of the electric water heater is characterized by comprising the following steps of: Transmitting a detection signal into a water tank of the electric water heater, and receiving an echo signal, wherein the echo signal comprises a plurality of dielectric layer reflection characteristics; extracting signal characteristics corresponding to preset parameters based on the echo signals, and calculating various parameter values according to the extracted signal characteristics, wherein the preset parameters at least comprise scale thickness, water supply pressure and water consumption; and generating and outputting a prompt message when at least one of the scale thickness, the water supply pressure or the water consumption meets a preset abnormal condition.
  2. 2. The electric water heater detection method according to claim 1, wherein extracting signal features corresponding to preset parameters based on the echo signals, and calculating parameter values from the extracted signal features, comprises: Processing the echo signals, separating and extracting first target signals corresponding to the inner wall of the water tank and the surface of the heating component from the echo signals, and second target signals corresponding to the water level surface inside the water tank; determining a scale thickness adhering to the inner wall and the heating element surface based on the first target signal; according to the phase change information corresponding to the air layer at the top of the water tank in the echo signal, combining the water temperature in the water tank, and calculating the water supply pressure; And determining the current water level height in the water tank according to the second target signal, and calculating the water consumption based on the water level change.
  3. 3. The method of claim 2, wherein processing the echo signal to separate and extract therefrom a first target signal corresponding to the tank inner wall and the heating element surface comprises: converting the echo signal from a time domain to a frequency domain to obtain a frequency domain signal; Defining a first frequency interval corresponding to the inner wall and a second frequency interval corresponding to the heating component position from the frequency domain signal based on a preset distance threshold parameter related to the water tank structure; And extracting effective target reflection peak signals in the first frequency interval and the second frequency interval to serve as the first target signals.
  4. 4. The method of claim 2, wherein determining the thickness of scale adhering to the inner wall and the heating element surface based on the first target signal comprises: calculating the distance offset between the actual detection distance corresponding to the first target signal and a prestored scale-free state reference distance; Obtaining the attenuation rate of the amplitude of the first target signal and the reference amplitude corresponding to the reference distance; Inputting the distance offset and the attenuation rate into a pre-trained scale thickness prediction model to obtain the scale thickness; the scale thickness prediction model is trained based on distance offset and signal attenuation rate data containing scale samples with different thicknesses.
  5. 5. The method for detecting an electric water heater according to claim 2, wherein the calculating the water supply pressure according to the phase change information corresponding to the air layer at the top of the water tank in the echo signal in combination with the water temperature in the water tank comprises: Extracting a phase difference of air layer reflected signals during two continuous sampling periods from the echo signals; determining a current air density according to the phase difference and a standard air density; Acquiring the water temperature in the water tank and converting the water temperature into absolute temperature; And calculating the water supply pressure according to the current air density and the absolute temperature of the water temperature.
  6. 6. The method of claim 2, wherein said processing the echo signal to extract therefrom a second target signal corresponding to the surface of the water level inside the tank comprises: Processing the echo signals by adopting a direction-of-arrival estimation algorithm to distinguish direct reflected signals from the water level surface from multipath reflected signals from the inner wall of the water tank; the direct reflected signal is extracted from the discriminated signal as the second target signal.
  7. 7. The method of claim 2, wherein determining a current water level height in the water tank based on the second target signal and calculating the water consumption based on the water level change comprises: According to the second target signal, calculating to obtain the distance from the signal transmitting end to the water level surface; subtracting the distance from the total depth of the water tank based on a preset total depth parameter of the water tank to obtain the current water level height; calculating the water level height variation according to the current water level height obtained in the adjacent two detection periods; And calculating to obtain the water volume in the corresponding time period according to the water level height variation and the preset cross-sectional area of the water tank.
  8. 8. The electric water heater detection method according to claim 1, wherein the generating and outputting a prompt message when at least one of the scale thickness, the water supply pressure, or the water consumption satisfies a preset abnormal condition includes: establishing an abnormality determination strategy, wherein the abnormality determination strategy comprises a scale thickness abnormality determination condition, a water supply pressure abnormality determination condition and a water consumption monitoring condition; Analyzing the detected scale thickness, water supply pressure and water consumption according to the abnormality judgment strategy; Only when the water supply pressure does not meet the abnormality determination condition and the scale thickness meets the abnormality determination condition, determining that the scale exceeds the standard and generating first type prompt information; When the scale thickness and the water supply pressure simultaneously meet respective abnormal judgment conditions, preferentially judging that the water supply pressure is insufficient and generating second-type prompt information; When the analysis result meets the water consumption monitoring condition, executing preset recording or analysis operation according to the water consumption or the water consumption mode; Based on the generated first type prompt information or the second type prompt information, corresponding early warning or maintenance advice is output through the local prompt equipment and/or the remote communication module.
  9. 9. The method for detecting an electric water heater according to any one of claims 1 to 8, wherein after calculating the water consumption in the corresponding period of time, the method further comprises: Monitoring the change state of the current water level height; When the current water level is monitored to be stable in a continuous first preset time period, judging that the single water use process is finished; Accumulating all water volumes calculated from the end of the last water using process to the end of the current water using process to serve as the total actually measured water consumption of the current water using process; calculating theoretical total water consumption according to the total variation of the water level height and the cross-sectional area of the water tank when the water consumption process starts and ends; And comparing the total measured water consumption with the theoretical total water consumption, and carrying out parameter calibration on the subsequent water consumption calculation process according to the comparison result.
  10. 10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor performs the steps of the electric water heater detection method of any one of claims 1 to 9 when the program is executed.

Description

Detection method and device for electric water heater and electronic equipment Technical Field The invention relates to the field of intelligent home, in particular to a detection method and device for an electric water heater and electronic equipment. Background The electric water heater is widely used as household appliances, and the long-term running performance and the use safety of the electric water heater are closely related to the cost of users. In the use, the inside phenomenon such as incrustation scale adhesion, water level dynamic change and supply pressure fluctuation that can produce of water tank, these factors directly influence heating efficiency, energy consumption level, core part life-span and user experience. In order to cope with these problems, various targeted detection methods have been developed in the industry. For scale detection, the prior art relies on a water quality conductivity sensor to calculate indirectly or adopts a pointer device mechanically linked with a magnesium rod to monitor locally. These methods do not allow for a direct and accurate measurement of the actual scale thickness on the tank inner wall and the heater rod surface. In the aspect of water level and water consumption monitoring, a mechanical floating ball type sensor or an electrode type sensor is commonly adopted, wherein the precision is limited, the clamping stagnation risk exists, and the water quality is possibly influenced by electrolysis, and the precision is not high. For water supply pressure monitoring of the electric water heater, an independent physical pressure sensor is usually required to be additionally arranged, so that the system cost and the structural complexity are increased, and the sensor probe is also at risk of failure due to blockage by scale. More prominently, the detection functions of the parameters of scale, water level, pressure and the like are generally dispersed and independent in the electric water heater products at present. This results in the need to deploy multiple different sets of sensing devices and processing circuits, which results in high hardware cost, complex wiring, large space occupation for the entire detection system, and reduced overall reliability of the system due to increased failure points. Disclosure of Invention The invention provides a detection method of an electric water heater, which is used for solving the problems that in the prior art, the water scale, pressure and water level detection functions of the electric water heater are scattered and independent, so that the hardware cost is high, the system is complex, and high-precision integrated real-time monitoring cannot be realized, and realizing non-contact integrated detection and intelligent early warning of the thickness of the water scale, the pressure of water supply and the water level/water consumption by utilizing a single radar signal. The invention provides a detection method of an electric water heater, which comprises the following steps: Transmitting a detection signal into a water tank of the electric water heater, and receiving an echo signal, wherein the echo signal comprises a plurality of dielectric layer reflection characteristics; extracting signal characteristics corresponding to preset parameters based on the echo signals, and calculating various parameter values according to the extracted signal characteristics, wherein the preset parameters at least comprise scale thickness, water supply pressure and water consumption; and generating and outputting a prompt message when at least one of the scale thickness, the water supply pressure or the water consumption meets a preset abnormal condition. The invention provides a detection method of an electric water heater, which is based on the echo signal, extracts signal characteristics corresponding to preset parameters and calculates various parameter values according to the extracted signal characteristics, and comprises the steps of processing the echo signal, separating and extracting a first target signal corresponding to the inner wall of a water tank and the surface of a heating component from the echo signal, and a second target signal corresponding to the water level surface inside the water tank; the method comprises the steps of determining the thickness of scale attached to the inner wall and the surface of a heating component according to a first target signal, calculating water supply pressure according to phase change information corresponding to an air layer at the top of a water tank in the echo signal and combining water temperature in the water tank, determining the current water level height in the water tank according to a second target signal, and calculating water consumption based on water level change. The invention provides a detection method of an electric water heater, which is used for processing echo signals and separating and extracting first target signals corresponding to the inner wall of a wa