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Flow compensation method, compensation device and flow sensor

A flow sensor and flow compensation technology, applied in the direction of measuring device, volume change compensation/correction device, measurement capacity, etc., can solve the problem of being affected by the temperature change of the medium, and also affected by the flow change, which cannot meet the measurement accuracy and cannot Eliminate problems such as the influence of flow changes to achieve the effect of improving measurement accuracy

Active Publication Date: 2016-05-11
ENN SCI & TECH DEV
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Problems solved by technology

However, when the flow rate of the medium changes, especially when the change range of the flow rate is large, for some flow sensors, especially MEMS (MicroElectroMechanicalSystem, microelectromechanical system) flow sensors, the measurement results are not only affected by the temperature change of the medium, but also Affected by flow changes, the existing compensation methods only compensate the measurement results for the factor of medium temperature changes, and cannot eliminate the influence of flow changes on the measurement results, resulting in a large deviation between the compensated flow value and the actual flow value , unable to meet the requirements for measurement accuracy

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  • Flow compensation method, compensation device and flow sensor
  • Flow compensation method, compensation device and flow sensor
  • Flow compensation method, compensation device and flow sensor

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Embodiment 1

[0026] This embodiment provides a flow compensation method, such as figure 1 As shown, the compensation method includes the following steps:

[0027] Step S1: Obtain the medium temperature t and the flow voltage of the flow sensor, the flow voltage is the initial flow voltage, use Ui 0 Indicates that according to the calibration relationship between the flow voltage and the flow value, the initial flow voltage Ui is obtained 0 The corresponding flow value, the flow value is the initial flow value, with Q 0 express. with F 1 () represents the calibration relationship function between the flow voltage and the flow value, then this step can be expressed as Q 0 =F 1 (Ui 0 ).

[0028] In step S1, the calibration relationship between the flow voltage and the flow value needs to be used, so the step of obtaining the calibration relationship between the flow voltage and the flow value may also be included before step S1, and this step may include: under different flow values, ...

Embodiment 2

[0059] In order to further improve the measurement accuracy of the flow sensor, the method provided in this embodiment is iterated on the basis of Embodiment 1 to calculate a more accurate compensation amount a related to the medium temperature t and the flow value Q.

[0060] see figure 2 , the flow compensation method provided in this embodiment may include the following steps:

[0061] Step S1: Obtain the medium temperature t and the initial flow voltage Ui of the flow sensor 0 , according to the calibration relationship between the flow voltage and the flow value, the initial flow voltage Ui is obtained 0 Corresponding flow value Q 0 , this step can be expressed as Q 0 =F 1 (Ui 0 ). How to get the calibration relationship between the flow voltage and the flow value, and how to get the initial flow voltage Ui 0 Corresponding flow value Q 0 , you can refer to the relevant content in the first embodiment.

[0062] Step S2: According to the medium temperature t and the...

Embodiment 3

[0076] This embodiment provides a flow compensation device, see Figure 5 , the compensation device includes a temperature sensor 1, a flow value acquisition unit 2, a compensation amount calculation unit 3 and a compensation unit 4, wherein the temperature sensor 1 and the flow value acquisition unit 2 are respectively connected to the compensation amount calculation unit 3, and the compensation unit 4 is connected to the compensation amount calculation unit Quantity calculation unit 3. The temperature sensor 1 is used to sense the temperature of the medium; the flow value acquisition unit 2 is used to obtain the flow voltage, and obtain the flow value corresponding to the obtained flow voltage according to the calibration relationship between the flow voltage and the flow value; the compensation amount calculation unit 3 It is used to obtain the medium temperature from the temperature sensor 1, and obtain the flow value from the flow value acquisition unit 2, and calculate t...

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Abstract

The invention provides a flow compensation method, a compensation device and a flow sensor, relates to the technical field of flow measurement, and aims to solve the problem that in the prior art the flow sensor is relatively poor in measurement precision. The flow compensation method comprises the following steps: 1, acquiring medium temperature and flow voltage, and acquiring a flow value corresponding to the acquired flow voltage according to the calibration relationship between the flow voltage and the flow value; 2, calculating the compensation amount according to the acquired medium temperature and the obtained flow value; 3, compensating the acquired flow voltage by using the calculated compensation amount, thereby obtaining compensated flow voltage; 4, according to the calibration relationship between the flow voltage and the flow value, obtaining the compensated flow value corresponding to the compensated flow voltage. The flow compensation method is used for compensating the measurement result of the flow sensor.

Description

technical field [0001] The invention relates to the technical field of flow measurement, in particular to a flow compensation method, a compensation device, and a flow sensor. Background technique [0002] A flow sensor is an instrument used to measure the flow of a medium. For a flow sensor, ideally, it is only required to be sensitive to the physical quantity of flow and not to other factors, so as to ensure the accuracy of the measurement results. However, in actual measurement, the measurement accuracy of the flow sensor will be affected by external factors. For example: when the temperature of the measured medium changes, due to the temperature characteristics of the flow sensor or the temperature drift of the electronic components in the flow sensor, etc., the flow value measured by the flow sensor will deviate from the actual flow value, and the measurement accuracy of the flow sensor decline. [0003] In the prior art, the method of subtracting the temperature comp...

Claims

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Application Information

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IPC IPC(8): G01F15/02G01F15/00
CPCG01F15/00G01F15/022
Inventor 陶仁义董胜龙段所行张金龙李国国
Owner ENN SCI & TECH DEV
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