Liquid level detection method and liquid level detection device
A liquid level detection and detector technology, applied in the field of measurement and control, can solve problems such as disordered liquid level judgment and difference error, and achieve the effects of improving accuracy, improving precision, and improving anti-interference.
Active Publication Date: 2020-02-21
BYD SEMICON CO LTD
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[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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[0016] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.
[0017] The liquid level detection method and liquid level detection device proposed by the embodiments of the present invention will be described below with reference to the drawings.
[0018] figure 1 It 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:
[0019] S1: Obtain the current capacitance value of each of the...
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The invention discloses a liquid level detection method and a liquid level detection device. The liquid level detection method includes the following steps: detecting a current capacitance of each capacitance detector of N capacitance detectors, wherein the N capacitance detectors are constructed into M capacitance detection units, each capacitance detection unit includes two capacitance detectors, and the N and the M are integers greater than 1; acquiring capacitance variation of each capacitance detector according to the current capacitance of each capacitance detector, and acquiring a capacitance variation difference of each capacitance detection unit according to the capacitance variation of each capacitance detector; and generating liquid level information according to the capacitancevariation difference of each capacitance detection unit. The liquid level detection method and the liquid level detection device can improve the accuracy of capacitance detection, can improve the precision of liquid level detection, has excellent resistance to environment change such as temperature drift, power supply shaking, and PCB noise, and can be used in complex environments.
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 art proposes an intelligent capacitive liquid level measuring instrument, which converts the capacitance change into a frequency change through a capacitance frequency conversion circuit, and then the central processing unit calculates the liquid level according to the frequency change and a software formula, thereby indirectly measuring the liquid level. [0003] However, the related technology has the problem of judging the liquid level by comparing the difference between the capacitance when there is no liquid and the capacitance when there is liquid. Since the capacitance when there is no liquid is a fixed reference value, there is no fixed reference value. Keep up with changes in the environment in time, such as when the environment is dry and temperature r...
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IPC IPC(8): G01F23/26
CPCG01F23/265
Inventor 何世娴李奇峰杨云
Owner BYD SEMICON CO LTD