Liquid level detection method and liquid level detection device
A technology of liquid level detection and capacitance detection, which is applied in the field of measurement and control, can solve problems such as liquid level judgment confusion and difference error, and achieve the effects of improving accuracy, improving precision, and good anti-interference
Active Publication Date: 2020-02-21
BYD SEMICON CO LTD
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Problems solved by technology
[0003] However, the problem in the related technology is that the liquid level is judged by comparing the difference between the capacitance when there is no liquid and the capacitance when there is liquid, because the capacitance when there is no liquid is a fixed reference value, so there is no reference value in the fixed reference value. Keep up with changes in the environment in time, such as when the environment is dry and the temperature rises, it is easy to cause error in the difference, resulting in confusion in the judgment of the liquid level
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[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0019] The liquid level detection method and the liquid level detection device proposed by the embodiments of the present invention are described below with reference to the accompanying drawings.
[0020] figure 1 is a flowchart of a liquid level detection method according to an embodiment of the present invention. Such as figure 1 As shown, the liquid level detection method of the embodiment of the present invention includes the following steps:
[0021] S1: Obtain an initial capacitance value of each capacitance detection u...
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The invention discloses a liquid level detection method and device. The method comprises the following steps of obtaining an initial capacitance of each of multiple capacitance detection units; detecting a current capacitance of each capacitance detection unit; obtaining a current environment compensation value, and according to the current environment compensation value and the initial capacitance, obtaining a reference capacitance of each capacitance detection unit; comparing the current capacitance of each capacitance detection unit with the corresponding reference capacitance to obtain thecapacitance variation of each capacitance detection unit, and according to the capacitance variation of each capacitance detection unit, generating liquid level information, so that the capacitance detection accuracy is improved, then, the liquid level detection accuracy is improved, the good anti-interference performance for environment changes such as temperature excursion, power shaking and PCB noise is achieved, and the method and device can be applied to the complex environment.
Description
technical field [0001] The invention relates to the technical field of measurement and control, in particular to a liquid level detection method and a liquid level detection device. Background technique [0002] The related technology proposes an intelligent capacitive liquid level measuring instrument, which converts capacitance change into frequency change through a capacitance frequency conversion circuit, and then the central processing unit calculates the liquid level according to the frequency change and through a software formula, thereby indirectly measuring the liquid level. [0003] However, the problem in the related technology is that the liquid level is judged by comparing the difference between the capacitance when there is no liquid and the capacitance when there is liquid. Because the capacitance when there is no liquid is a fixed reference value, there is no fixed reference value. To keep up with changes in the environment in time, for example, when the envi...
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IPC IPC(8): G01F23/26
CPCG01F23/263
Inventor 何世娴李奇峰杨云
Owner BYD SEMICON CO LTD