Temperature compensation type liquid level detection algorithm
A temperature compensation, liquid level detection technology, applied in liquid/fluid solid measurement, measurement device, liquid level indicator, etc., can solve the problems of troublesome cleaning and maintenance, low detection accuracy, affecting liquid level detection, etc. Simple process, fast dynamic response, accurate detection effect
Pending Publication Date: 2022-03-22
深圳市矽海半导体有限公司
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Problems solved by technology
This method requires direct contact with the liquid in the container, and the impurities in the liquid, the sediment, the viscosity of the liquid itself, and the corrosiveness of the liquid will affect the accuracy of liquid level detection, and the daily cleaning and maintenance are also more troublesome.
[0005] The detection principle of the photoelectric liquid level sensor is optical reflection, and will not be affected by dirt, impurities, sediments, etc. in the liquid, but the light intensity in the environment, liquid droplets on the probe, fluctuations in the liquid level, etc. will affect the measurement accuracy, for Solving these problems usually requires modification of the mechanical structure, and the processing on the software is also relatively complicated.
[0006] The detection accuracy of ordinary touch liquid level detection is low, and it cannot detect liquid level outside the 2-3MM thick shell, and has no temperature compensation function. There are misjudgments when the temperature changes, and the practicability is not high
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[0032] The present invention will be further explained below in conjunction with specific embodiments.
[0033] According to the principle of capacitive touch detection, the invention uses specially designed temperature detection channels and the strong sensitivity of the A1semi chip to measure the sensing capacitance value of each channel, and combines the liquid level detection algorithm to determine whether the liquid level reaches the preset liquid level.
[0034] Because the same liquid level and different temperatures have different influences on the sensing capacitance, the real-time value of capacitance detection at different temperatures at the same liquid level can be obtained in real time through the self-developed upper computer software, and the influence of temperature on the sensing capacitance can be obtained by fitting the curve The degree of temperature compensation coefficient is substituted into the temperature compensation algorithm, so that the current tem...
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The invention discloses a temperature compensation type liquid level detection algorithm, which achieves the purpose of liquid level detection by detecting the change of capacitance and performing data processing by using a special capacitance detection chip. The device has the advantages of simple structure and installation process, fast dynamic response and the like. The liquid level detection device can be used for detecting the liquid level only by attaching the PCB to the outer wall of a container, due to the characteristic of non-contact measurement, the liquid level detection device is not affected by dirt, impurities, precipitates and other substances in liquid and various properties of the liquid, and accurate detection can be conducted at different temperatures in combination with a temperature compensation algorithm.
Description
technical field [0001] The invention relates to the technical field of liquid level detection, in particular to a temperature compensation liquid level detection algorithm. Background technique [0002] There are water tanks inside household electrical appliances such as drinking liquid dispensers, humidifiers, and coffee machines that are used in daily use. Liquid level detection functions are required to control the liquid level and realize functions such as water shortage protection, water shortage alarm, and automatic water filling. [0003] At present, the main liquid level detection sensors in the field of home appliances include float type liquid level gauges, photoelectric liquid level sensors, and ordinary touch liquid level detection. [0004] Among them, the float type liquid level gauge uses the float to move up and down according to the liquid level, and the magnet in the float drives the opening / closing of the reed switch to detect the liquid level. This metho...
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IPC IPC(8): G01F23/80G01F23/263
CPCG01F23/266
Inventor 唐立波
Owner 深圳市矽海半导体有限公司