Palladium alloy film hydrogen sensor pressure compensation method and device, transmitter and storage medium

Abstract

The embodiment of the invention discloses a pressure compensation method and device for a palladium alloy film hydrogen sensor, a transmitter and a storage medium. The method comprises the following steps: acquiring an actually measured ambient atmospheric pressure value at the current altitude and a current output resistance value of hydrogen to be measured measured by the palladium alloy film hydrogen sensor at the current altitude; obtaining a hydrogen partial pressure value of the to-be-measured hydrogen according to the current output resistance value in combination with a fitting curve relation of the palladium alloy film hydrogen sensor during factory calibration; and calculating the ratio of the hydrogen partial pressure value to the actually measured atmospheric pressure value, and taking the ratio as the volume fraction value of the hydrogen to be measured measured by the palladium alloy film hydrogen sensor at the current altitude. Therefore, the actual volume fraction value of the to-be-measured hydrogen at the current altitude can be obtained, and the volume fraction measurement value of the to-be-measured hydrogen after the altitude is changed is strictly compensated according to the physical property of the gas.

Description

Technical Field

[0001] The embodiments of the present invention belong to the technical field of hydrogen sensors, and specifically relate to a pressure compensation method, device, transmitter and storage medium for a palladium alloy thin film hydrogen sensor. Background Art

[0002] Hydrogen fuel cell vehicles are one of the solutions for new energy vehicles. However, when the hydrogen content in the air is between 4% and 74%, it can explode when it encounters a fire source. Therefore, in the hydrogen fuel cell vehicle industry, it is necessary to install automotive hydrogen sensors during the storage, transmission and use of hydrogen. Palladium alloy thin film hydrogen sensors have the advantages of not being affected by combustible gases such as CO, CH and NOx, detecting hydrogen specifically, and being able to work normally in both oxygen and oxygen-free conditions. They can be used in automotive hydrogen leak detection.

[0003] During long-distance operation, hydrogen fuel cell vehicles will encounter actual working conditions where altitude changes cause changes in ambient atmospheric pressure. The pressure adaptation range of palladium alloy film hydrogen sensors currently on the market is small, and is basically within the range of normal pressure (one standard atmospheric pressure). However, the ambient atmospheric pressure after altitude changes is likely to exceed the pressure adaptation range of the palladium alloy film hydrogen sensor. At this time, the measured output value of the palladium alloy film hydrogen sensor still refers to the ambient atmospheric pressure value at the time of factory calibration, and the volume fraction value of the hydrogen to be measured is inaccurate. Summary of the invention

[0004] The present application proposes a palladium alloy thin film hydrogen sensor pressure compensation method, device, transmitter and storage medium to perform pressure compensation on the palladium alloy thin film hydrogen sensor to adapt to changes in altitude.

[0005] In a first aspect, an embodiment of the present invention provides a palladium alloy thin film hydrogen sensor pressure compensation method, comprising:

[0006] Obtain the actual measured ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude;

[0007] Obtaining the hydrogen partial pressure value of the hydrogen to be measured according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration;

[0008] The ratio of the hydrogen partial pressure value to the measured ambient atmospheric pressure value is calculated, and the ratio is used as a volume fraction measurement value of the hydrogen to be measured by the palladium alloy thin film hydrogen sensor at the current altitude.

[0009] In a second aspect, an embodiment of the present invention provides a palladium alloy thin film hydrogen sensor pressure compensation device, comprising:

[0010] The first acquisition module is used to obtain the actual measured ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude;

[0011] A hydrogen partial pressure acquisition module, used to obtain the hydrogen partial pressure value of the hydrogen to be measured according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration;

[0012] The ratio calculation module is used to use the ratio of the hydrogen partial pressure value to the measured ambient atmospheric pressure value as the volume fraction measurement value of the hydrogen to be measured by the palladium alloy thin film hydrogen sensor at the current altitude.

[0013] In a third aspect, an embodiment of the present invention provides a palladium alloy thin film hydrogen concentration transmitter, comprising:

[0014] Palladium alloy thin film hydrogen sensor, air pressure sensor, central processing module and memory;

[0015] The central processing module is electrically connected to the palladium alloy thin film hydrogen sensor, the air pressure sensor and the memory respectively;

[0016] The palladium alloy thin film hydrogen sensor is used to obtain the current output resistance value of the hydrogen to be measured at the current altitude;

[0017] The air pressure sensor is used to obtain the actual ambient atmospheric pressure value at the current altitude;

[0018] The memory is used to store one or more programs;

[0019] The one or more programs are executed by the central processing module, so that the central processing module implements the pressure compensation method for the palladium alloy thin film hydrogen sensor as described in the first aspect of the embodiment of the present invention.

[0020] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the pressure compensation method for the palladium alloy thin film hydrogen sensor as described in the first aspect of the embodiment of the present invention is implemented.

[0021] The embodiment of the present invention obtains the actual measured ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude; obtains the hydrogen partial pressure value of the hydrogen to be measured according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration; calculates the ratio of the hydrogen partial pressure value to the actual measured ambient atmospheric pressure value, and uses the ratio as the volume fraction measurement value of the hydrogen to be measured by the palladium alloy thin film hydrogen sensor at the current altitude. Thus, the actual volume fraction value of the hydrogen to be measured at the current altitude can be obtained, and the volume fraction measurement value of the hydrogen to be measured after the altitude changes can be strictly compensated according to the physical properties of the gas. Thereby solving the problem that hydrogen fuel cell vehicles cannot provide hydrogen gas integral fraction measurement values ​​that adapt to the altitude during the altitude change. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic flow chart of a pressure compensation method for a palladium alloy thin film hydrogen sensor provided in Embodiment 1 of the present invention;

[0023] Figure 2 It is a schematic flow chart of a pressure compensation method for a palladium alloy thin film hydrogen sensor provided in the second embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of a pressure compensation device for a palladium alloy thin film hydrogen sensor provided in Embodiment 3 of the present invention;

[0025] Figure 4 is a schematic diagram of the structure of a palladium alloy thin film hydrogen concentration transmitter provided in Embodiment 4 of the present invention;

[0026] Figure 5 This is an application example diagram of the palladium alloy thin film hydrogen concentration transmitter provided in Example 4 of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. It is also necessary to explain that, for ease of description, only the parts related to the embodiments of the present invention are shown in the accompanying drawings, rather than all structures.

[0028] It is understandable that the palladium alloy film is a special gas-sensitive material for hydrogen sensors with outstanding hydrogen absorption performance. When the palladium alloy film absorbs a small amount of hydrogen, the hydrogen dissolves in the palladium lattice under the catalytic cracking of palladium. The solubility of hydrogen in palladium alloy can be approximately described by an empirical formula (Sieverts rule), and its mathematical expression is:

[0029]

[0030] Where [%H] is the solubility of hydrogen in the metal, expressed as mass percentage, and p H is the partial pressure of hydrogen, and K is the Sieverts constant.

[0031] According to Siewerts' law, the solubility of hydrogen in palladium alloy films can be determined, and the solubility can be calculated from the equilibrium partial pressure or the equilibrium partial pressure can be calculated from the solubility. From this law, it can be seen that the palladium alloy film hydrogen sensor measures the hydrogen concentration in essence by measuring the hydrogen partial pressure, but the gas sensor usually uses the volume ratio concentration (volume fraction, commonly used unit: ppm) or molar ratio concentration (mole fraction, commonly used unit: μmol / mol) as the proportion of the measured gas in the ambient gas within a specified range.

[0032] According to common knowledge in chemistry, an ideal gas is an idealized model that does not actually exist. In real gases, all gases that are not easily liquefied have properties very similar to those of an ideal gas. Under conditions where the pressure is not too high and the temperature is not too low, the properties of general gases are also very close to those of an ideal gas. Air, hydrogen, and oxygen at room temperature can all be treated as ideal gases. This can greatly simplify research problems, especially calculations. In the application conditions of automotive hydrogen sensors, the atmospheric pressure may fluctuate from 0.5 to 1 atmosphere. When the hydrogen sensor is in operation, the temperature will not be too low even if there are heating measures, which meets the requirements of an ideal gas for a pressure that is not too high and a temperature that is not too low.

[0033] The ideal gas state equation is expressed as:

[0034] pV=nRT (2)

[0035] In the formula, p: gas pressure (unit: Pa); V: gas volume (unit: L); n: amount of substance of gas molecules (unit: mol); T: temperature (unit: K); R: molar gas constant (unit: J / mol*k).

[0036] It can be deduced that:

[0037] p=(n / V)*R*T (3)

[0038] Because C n =n / V, where C n is the amount of substance concentration of the gas (hereinafter referred to as concentration), so it can be deduced that:

[0039] p=C n *R*T (4)

[0040] It can be seen that when the temperature is constant, the molar gas constant R is constant, and the concentration of the gas to be measured remains unchanged, the partial pressure of the gas to be measured remains unchanged.

[0041] Atmospheric pressure decreases with increasing altitude. So for the same concentration of hydrogen, when the temperature remains approximately unchanged, the hydrogen partial pressure does not change with altitude.

[0042] Under isothermal and isochoric conditions, the mixed gas (A) and its individual components (1, 2, ..., i, ..., n) all satisfy the ideal gas state equation, namely:

[0043] p A V=n A RT

[0044] p1V=n1RT

[0045] p2V=n2RT

[0046] …

[0047] p i V=n i RT

[0048] …

[0049] p n V=n n RT

[0050] Right now:

[0051]

[0052] From formula (5), we can get:

[0053]

[0054] Under normal conditions, a certain amount of an ideal gas corresponds to a certain volume. The volume occupied by a unit amount of gas is called the molar volume of the gas (V m =V i / n, where V m represents the molar volume of a gas). At the same temperature and pressure, the volume occupied by 1 mol of any gas is approximately equal in value. For example, under standard conditions, the volume of 1 mol of gas is 22.4 L, so:

[0055]

[0056] That is, for the same state, the pressure fraction of a single component gas (i.e., the ratio of the partial pressure of a single component gas to the total pressure of the mixed gas) is equal to the mole fraction of the single component gas, which is equal to the volume fraction of the single component gas (the volume fraction of the single component gas i is recorded as C Vi ).

[0057] The volume fraction of hydrogen to be measured is recorded as C VH , then:

[0058]

[0059] The ambient atmospheric pressure value used for calibration of the hydrogen sensor when it leaves the factory can be recorded in the memory inside the onboard central processor and is recorded as p A0 Usually, the hydrogen sensor calibration algorithm is to record a set of resistance values ​​and corresponding hydrogen partial pressure values ​​output by the hydrogen sensor, and then perform curve fitting, write the fitted curve data into the CPU memory, and form a corresponding relationship between the resistance value output by the hydrogen sensor and the hydrogen partial pressure of the hydrogen to be measured, as shown in the following table:

[0060]

[0061] In high altitude areas, although the ambient atmospheric pressure has changed relative to the ambient atmospheric pressure at factory calibration, according to formula (4), under the conditions of constant temperature and constant molar gas constant R, for the same concentration of hydrogen to be measured, its hydrogen partial pressure remains unchanged, and what changes with the ambient atmospheric pressure is the volume fraction of the hydrogen to be measured relative to the gas environment. What we need is the hydrogen gas integral value that adapts to the change in altitude.

[0062] The hydrogen gas volume that adapts to the change in altitude is recorded as C VH-real , the ambient atmospheric pressure at the actual altitude is recorded as p A-real , the partial pressure of hydrogen to be measured is recorded as p H , then:

[0063]

[0064] Assuming the factory calibration environment, the hydrogen partial pressure p H The corresponding volume fraction is C VH , then:

[0065] p H =p A0 *C VH =p A-real *C VH-real (10)

[0066] Among them, the ambient atmospheric pressure at the actual altitude is p A-real The onboard pressure sensor can measure the partial pressure of hydrogen in real time. H The resistance value can be obtained by substituting the resistance value output by the palladium alloy hydrogen sensor in real time into the calibration fitting curve relationship or querying the calibration fitting relationship data table.

[0067] The embodiment of the present invention is to obtain the ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor, and based on the derivation conclusion that under the conditions of constant temperature and constant molar gas constant R, for the same concentration of hydrogen to be measured, the hydrogen partial pressure does not change with the change of altitude, combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration, and the relationship between the ambient atmospheric pressure, the hydrogen partial pressure of the hydrogen to be measured and the volume fraction of the hydrogen to be measured, the volume fraction value of the hydrogen to be measured at the current altitude is obtained, thereby achieving strict compensation for the volume fraction measurement value of the hydrogen to be measured after the altitude changes according to the physical properties of the gas.

[0068] Embodiment 1

[0069] Figure 1 The flowchart of the pressure compensation method of the palladium alloy thin film hydrogen sensor provided in the first embodiment of the present invention is applicable to obtaining the ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor, combining the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration, and the relationship between the ambient atmospheric pressure, the hydrogen partial pressure of the hydrogen to be measured and the volume fraction of the hydrogen to be measured, thereby compensating the volume fraction measurement value of the hydrogen to be measured after the altitude changes. The method can be performed by a palladium alloy thin film hydrogen sensor pressure compensation device, which is implemented by hardware and / or software, and is generally integrated on a palladium alloy thin film hydrogen concentration transmitter to which the palladium alloy thin film hydrogen sensor pressure compensation method is applied.

[0070] like Figure 1 As shown, the pressure compensation method of the palladium alloy thin film hydrogen sensor provided in this embodiment specifically includes the following steps:

[0071] S101, obtaining the actual measured ambient atmospheric pressure value at the current altitude and the current output resistance value of the hydrogen to be measured by the palladium alloy thin film hydrogen sensor at the current altitude.

[0072] Optionally, the measured ambient atmospheric pressure value may be obtained by measuring the ambient atmospheric pressure value at the current altitude in real time by a pressure sensor.

[0073] It is understandable that under the conditions of constant temperature and constant molar gas constant R, for the same concentration of hydrogen to be measured, the volume fraction of the hydrogen to be measured relative to the gas environment in which it is located changes with the change of the ambient atmospheric pressure. Therefore, to determine the actual volume fraction value of the hydrogen to be measured at the current altitude, it is necessary to know the ambient atmospheric pressure value at the current altitude. The volume fraction of the hydrogen to be measured is determined by the hydrogen partial pressure of the hydrogen to be measured and the ambient atmospheric pressure. The hydrogen partial pressure of the hydrogen to be measured has a corresponding relationship with the output resistance value of the palladium alloy thin film hydrogen sensor. Therefore, it is also necessary to obtain the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude.

[0074] S102, obtaining the hydrogen partial pressure value of the hydrogen to be measured according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration.

[0075] The fitting curve relationship refers to the functional relationship between the output resistance value of the palladium alloy thin film hydrogen sensor and the hydrogen partial pressure value of the hydrogen standard gas, which is fitted according to calibration data when the palladium alloy thin film hydrogen sensor is calibrated at the factory.

[0076] Optionally, the fitting curve relationship is expressed as a functional relationship between the output resistance value of the palladium alloy thin film hydrogen sensor and the standard hydrogen partial pressure value.

[0077] The standard hydrogen partial pressure value refers to the hydrogen partial pressure value of the hydrogen standard gas used for data calibration during factory calibration of the palladium alloy thin film hydrogen sensor.

[0078] Optionally, the functional relationship may be a power function relationship or a quadratic function relationship.

[0079] In one embodiment, the hydrogen partial pressure value of the hydrogen to be measured is obtained according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration, including:

[0080] Substitute the current output resistance value into the functional relationship to find the hydrogen partial pressure value.

[0081] Optionally, the fitting curve relationship is represented by a mapping data table of the output resistance value of the palladium alloy thin film hydrogen sensor with respect to the standard hydrogen partial pressure value.

[0082] The mapping data table refers to a numerical table recording the output resistance value of the palladium alloy thin film hydrogen sensor and its corresponding standard hydrogen partial pressure value.

[0083] In one embodiment, the hydrogen partial pressure value of the hydrogen to be measured is obtained according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration, including:

[0084] The mapping data table is queried according to the current output resistance value to obtain the hydrogen partial pressure value.

[0085] It should be noted that, since the fitting curve is obtained by fitting based on limited calibration data, the obtained fitting curve relationship is not only applicable to the limited calibration data, but also to any other data point on the fitting curve.

[0086] It is understandable that, under the conditions of constant temperature and constant molar gas constant R, for the same concentration of hydrogen to be measured, its hydrogen partial pressure value does not change with the change of altitude. Therefore, for the same concentration of hydrogen to be measured, its hydrogen partial pressure value under the ambient atmospheric pressure conditions when the palladium alloy thin film hydrogen sensor is calibrated at the factory is the same as the hydrogen partial pressure value under the ambient atmospheric pressure conditions after the altitude changes. In addition, because the curve relationship fitted according to the calibration data during the factory calibration of the palladium alloy thin film hydrogen sensor is a functional relationship between the output resistance value of the palladium alloy thin film hydrogen sensor and the hydrogen partial pressure value of the hydrogen standard gas, therefore, as long as the current output resistance value of the palladium alloy thin film hydrogen sensor measured at the current altitude is brought into the above-mentioned fitting curve relationship, the hydrogen partial pressure value of the hydrogen to be measured that does not change with the altitude can be obtained.

[0087] S103, calculating the ratio of the hydrogen partial pressure value to the measured ambient atmospheric pressure value, and using the ratio as the volume fraction measurement value of the hydrogen to be measured by the palladium alloy thin film hydrogen sensor at the current altitude.

[0088] It can be understood that, for the same state, the pressure fraction of a single component gas (i.e., the ratio of the partial pressure of a single component gas to the total pressure of the mixed gas) is equal to the mole fraction of the single component gas, which is equal to the volume fraction of the single component gas. Therefore, the ratio of the hydrogen partial pressure value of the hydrogen to be measured to the actual ambient atmospheric pressure value at the current altitude is the volume fraction value of the hydrogen to be measured at the current altitude.

[0089] The embodiment of the present invention obtains the actual measured ambient atmospheric pressure value at the current altitude and the current output resistance value of the hydrogen to be measured by the palladium alloy thin film hydrogen sensor at the current altitude; obtains the hydrogen partial pressure value of the hydrogen to be measured according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration; calculates the ratio of the hydrogen partial pressure value to the actual measured ambient atmospheric pressure value, and uses the ratio as the volume fraction measurement value of the hydrogen to be measured by the palladium alloy thin film hydrogen sensor at the current altitude. Thus, the actual volume fraction value of the hydrogen to be measured at the current altitude can be obtained, and the volume fraction measurement value of the hydrogen to be measured after the altitude changes can be strictly compensated according to the physical properties of the gas. Thereby solving the problem that hydrogen fuel cell vehicles cannot provide hydrogen gas integral fraction measurement values ​​that adapt to the altitude during the altitude change.

[0090] Embodiment 2

[0091] Figure 2 A flow chart of a pressure compensation method for a palladium alloy thin film hydrogen sensor provided in the second embodiment of the present invention, this embodiment is further optimized on the basis of the first embodiment. This embodiment optimizes and adds the following steps before obtaining the ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude: obtaining the ambient atmospheric pressure value when the palladium alloy thin film hydrogen sensor is factory calibrated, the volume fraction values ​​of a plurality of calibration hydrogen standard gases with different volume fractions, and the plurality of calibration output resistance values ​​obtained by the palladium alloy thin film hydrogen sensor measuring a plurality of the hydrogen standard gases; obtaining the fitting curve relationship according to the ambient atmospheric pressure value, the plurality of the volume fraction values, and the plurality of the calibration output resistance values.

[0092] like Figure 2 As shown, the pressure compensation method of the palladium alloy thin film hydrogen sensor provided in this embodiment specifically includes the following steps:

[0093] S201, obtaining the ambient atmospheric pressure value when the palladium alloy thin film hydrogen sensor is factory calibrated, the volume fraction values ​​of a plurality of calibration hydrogen standard gases with different volume fractions, and a plurality of calibration output resistance values ​​obtained by measuring a plurality of the hydrogen standard gases by the palladium alloy thin film hydrogen sensor.

[0094] The calibrated output resistance value refers to the output resistance value obtained by the palladium alloy thin film hydrogen sensor measuring the hydrogen standard gas.

[0095] It is understandable that the palladium alloy thin film hydrogen sensor needs to be calibrated with hydrogen standard gas during factory calibration. Since the fitting curve relationship used for calibration is a functional relationship between the output resistance value of the palladium alloy thin film hydrogen sensor and the hydrogen partial pressure value of the hydrogen standard gas, the hydrogen partial pressure value of the hydrogen standard gas and its corresponding output resistance value of the palladium alloy thin film hydrogen sensor need to be selected to form the calibration data, and a multi-point calibration method (i.e., multiple sets of calibration data) is usually used for data calibration.

[0096] S202: Obtain the fitting curve relationship according to the ambient atmospheric pressure value, the multiple volume fraction values, and the multiple calibrated output resistance values.

[0097] In one embodiment, step S202 specifically includes the following steps S2020 to S2023:

[0098] S2020. Multiply the ambient atmospheric pressure value by each of the multiple volume fraction values ​​to obtain a standard hydrogen partial pressure value corresponding to each volume fraction value.

[0099] S2021. Combine each of the multiple standard hydrogen partial pressure values ​​and the calibrated output resistance values ​​corresponding to each of the multiple calibrated output resistance values ​​into a group of calibration data to obtain multiple groups of calibration data.

[0100] S2022. Perform curve fitting based on the multiple groups of calibration data to obtain the fitting curve relationship.

[0101] It can be understood that the volume fraction value of the hydrogen to be measured under the atmospheric pressure conditions of the palladium alloy thin film hydrogen sensor factory calibration environment is equal to the ratio of the hydrogen partial pressure value of the hydrogen to be measured to the atmospheric pressure value of the palladium alloy thin film hydrogen sensor when it is factory calibrated. Therefore, the atmospheric pressure value of the palladium alloy thin film hydrogen sensor when it is factory calibrated and the volume fraction values ​​of a plurality of calibration hydrogen standard gases with different volume fractions are obtained, and the atmospheric pressure value is multiplied by each volume fraction value to obtain the hydrogen partial pressure values ​​of a plurality of hydrogen standard gases. Each hydrogen partial pressure value and the corresponding output resistance value can form a set of calibration data, thereby obtaining multiple sets of calibration data. The curve fitting method is used to perform curve fitting, and the fitting curve relationship used to calibrate the palladium alloy thin film hydrogen sensor can be obtained.

[0102] S203, calibrating the palladium alloy thin film hydrogen sensor using the fitting curve relationship.

[0103] S204, obtaining the actual measured ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude.

[0104] S205. Obtain the hydrogen partial pressure value of the hydrogen to be measured according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration.

[0105] S206. Calculate the ratio of the hydrogen partial pressure value to the measured ambient atmospheric pressure value, and use the ratio as the volume fraction value of the hydrogen to be measured measured by the palladium alloy thin film hydrogen sensor at the current altitude.

[0106] The embodiment of the present invention obtains the ambient atmospheric pressure value of the palladium alloy thin film hydrogen sensor during factory calibration, the volume fraction values ​​of a plurality of calibration hydrogen standard gases with different volume fractions, and the palladium alloy thin film hydrogen sensor measuring a plurality of the hydrogen standard gases to obtain a plurality of calibration output resistance values; then obtains calibration data according to the ambient atmospheric pressure value, the plurality of the volume fraction values, and the plurality of the calibration output resistance values, and performs curve fitting; then obtains the actual ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude; obtains the hydrogen partial pressure value of the hydrogen to be measured according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration; calculates the ratio of the hydrogen partial pressure value to the actual ambient atmospheric pressure value, and uses the ratio as the volume fraction value of the hydrogen to be measured by the palladium alloy thin film hydrogen sensor at the current altitude. Thus, the volume fraction value of the hydrogen to be measured at the current altitude can be obtained, and the volume fraction measurement value of the hydrogen to be measured after the altitude changes according to the physical properties of the gas is strictly compensated. This solves the problem that hydrogen fuel cell vehicles cannot provide hydrogen gas integral fraction measurement values ​​that adapt to the altitude during changes in altitude.

[0107] Embodiment 3

[0108] Figure 3 This is a schematic diagram of the structure of a palladium alloy thin film hydrogen sensor pressure compensation device provided in Example 3 of the present invention. This embodiment can be used to obtain the ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor, combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration, and the relationship between the ambient atmospheric pressure, the hydrogen partial pressure of the hydrogen to be measured and the volume fraction of the hydrogen to be measured, to obtain the volume fraction value of the hydrogen to be measured at the current altitude, thereby compensating for the volume fraction measurement value of the hydrogen to be measured after the altitude changes. The palladium alloy thin film hydrogen sensor pressure compensation device is implemented by hardware and / or software, and specifically includes: a first acquisition module 301, a hydrogen partial pressure acquisition module 302, and a ratio calculation module 303. Among them,

[0109] The first acquisition module 301 is used to obtain the actual measured ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude;

[0110] A hydrogen partial pressure acquisition module 302 is used to obtain the hydrogen partial pressure value of the hydrogen to be measured according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration;

[0111] The ratio calculation module 303 is used to use the ratio of the hydrogen partial pressure value to the measured ambient atmospheric pressure value as the volume fraction value of the hydrogen to be measured measured by the palladium alloy thin film hydrogen sensor at the current altitude.

[0112] Optionally, the fitting curve relationship is expressed as a functional relationship between the output resistance value of the palladium alloy thin film hydrogen sensor and the standard hydrogen partial pressure value.

[0113] Based on the above embodiments, the hydrogen partial pressure acquisition module 302 includes:

[0114] The numerical calculation unit is used to substitute the current output resistance value into the functional relationship to obtain the hydrogen partial pressure value.

[0115] Optionally, the fitting curve relationship is represented by a mapping data table of the output resistance value of the palladium alloy thin film hydrogen sensor with respect to the standard hydrogen partial pressure value.

[0116] Based on the above embodiments, the hydrogen partial pressure acquisition module 302 includes:

[0117] A numerical query unit is used to query the mapping data table according to the current output resistance value to obtain the hydrogen partial pressure value.

[0118] On the basis of the above embodiments, the palladium alloy thin film hydrogen sensor pressure compensation device may further include:

[0119] A second acquisition module is used to obtain the ambient atmospheric pressure value when the palladium alloy thin film hydrogen sensor is factory calibrated, the volume fraction values ​​of a plurality of calibration hydrogen standard gases with different volume fractions, and a plurality of calibration output resistance values ​​obtained by the palladium alloy thin film hydrogen sensor measuring a plurality of the hydrogen standard gases, before obtaining the ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude;

[0120] A curve fitting module, used for obtaining the fitting curve relationship according to the ambient atmospheric pressure value, the plurality of volume fraction values ​​and the plurality of calibrated output resistance values;

[0121] A data calibration module is used to calibrate the palladium alloy thin film hydrogen sensor using the fitting curve relationship.

[0122] Based on the above embodiments, the curve fitting module includes:

[0123] a hydrogen partial pressure acquisition unit, configured to multiply the ambient atmospheric pressure value by each of the plurality of volume fraction values ​​to obtain a standard hydrogen partial pressure value corresponding to each volume fraction value;

[0124] a calibration data acquisition unit, used for combining each standard hydrogen partial pressure value among the plurality of standard hydrogen partial pressure values ​​and a calibration output resistance value corresponding to each standard hydrogen partial pressure value among the plurality of calibration output resistance values ​​into a group of calibration data, so as to obtain a plurality of groups of calibration data;

[0125] The curve fitting unit is used to perform curve fitting based on the multiple sets of calibration data to obtain the fitting curve relationship.

[0126] The palladium alloy thin film hydrogen sensor pressure compensation device provided in the embodiment of the present invention can execute the palladium alloy thin film hydrogen sensor pressure compensation method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0127] Embodiment 4

[0128] Figure 4 A schematic diagram of the structure of a palladium alloy thin film hydrogen concentration transmitter provided in the fourth embodiment of the present invention is shown in FIG. Figure 4 As shown, the palladium alloy thin film hydrogen concentration transmitter includes: a palladium alloy thin film hydrogen sensor 40, a pressure sensor 41, a central processing module 42 and a memory 43; the central processing module 42 is electrically connected to the palladium alloy thin film hydrogen sensor 40, the pressure sensor 41 and the memory 43 respectively; the palladium alloy thin film hydrogen sensor 40 is used to obtain the current output resistance value of the hydrogen to be measured at the current altitude; the pressure sensor 41 is used to obtain the actual measured ambient atmospheric pressure value at the current altitude.

[0129] The memory 43, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as the program instructions / modules corresponding to the palladium alloy thin film hydrogen sensor pressure compensation method in the embodiment of the present invention (for example, the first acquisition module 301, the hydrogen partial pressure acquisition module 302, and the ratio calculation module 303 in the palladium alloy thin film hydrogen sensor pressure compensation device). The central processing module 42 executes the corresponding various functional applications and data processing by running the software programs, instructions and modules stored in the memory 43, that is, realizing the above-mentioned palladium alloy thin film hydrogen sensor pressure compensation method.

[0130] The memory 43 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 43 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 43 may further include a memory remotely arranged relative to the central processing module 42, and these remote memories may be connected to the device / terminal / server via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0131] For example, Figure 5 This is an application example diagram of the palladium alloy thin film hydrogen concentration transmitter provided in the fourth embodiment of the present invention. Figure 5 As shown, the palladium alloy thin film hydrogen concentration transmitter includes: a power module 50, a palladium alloy thin film hydrogen sensitive element 51, a signal conditioning module 52, an analog-to-digital converter (ADC) acquisition module 53, an air pressure sensor 54, a communication module 55 and a central processing module 56.

[0132] The central processing module 56 is electrically connected to the ADC acquisition module 53 , the air pressure sensor 54 , and the communication module 55 , respectively. The signal conditioning module 52 is electrically connected to the palladium alloy thin film hydrogen sensitive element 51 and the ADC acquisition module 53 , respectively.

[0133] The palladium alloy thin film hydrogen sensitive element 51 converts the volume fraction value of the hydrogen to be measured into a resistance value, and the signal conditioning circuit 52 converts the resistance signal output by the palladium alloy thin film hydrogen sensitive element 51 into a voltage signal, which is then converted into a digital signal and output via the ADC acquisition module 53. Optionally, the digital signal converted by the ADC acquisition module 53 is read by the central processing module 56 via a serial communication method.

[0134] The central processing module 56 receives the digital signal of the volume fraction of the hydrogen to be measured sent by the ADC acquisition module 53 in real time. At the same time, the central processing module 56 receives the ambient atmospheric pressure value collected by the pressure sensor 54 in real time, and calculates the volume fraction value of the hydrogen to be measured at the current altitude through correction and compensation by the palladium alloy thin film hydrogen sensor pressure compensation method of the embodiment of the present invention, and transmits the volume fraction value to the hydrogen management system (Hydrogen Management System, HMS) of the hydrogen fuel cell vehicle through the communication module.

[0135] The power module 50 is responsible for converting the voltage from the hydrogen fuel cell HMS into 5V, which is then converted into 5V through multiple voltage stages to power the other components of the palladium alloy thin film hydrogen concentration transmitter.

[0136] Embodiment 5

[0137] Embodiment 5 of the present invention further provides a storage medium containing computer executable instructions, wherein the computer executable instructions are used to execute a palladium alloy thin film hydrogen sensor pressure compensation method when executed by a computer processor, the method comprising:

[0138] Obtain the actual measured ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude;

[0139] Obtaining the hydrogen partial pressure value of the hydrogen to be measured according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration;

[0140] The ratio of the hydrogen partial pressure value to the measured ambient atmospheric pressure value is calculated, and the ratio is used as a volume fraction measurement value of the hydrogen to be measured by the palladium alloy thin film hydrogen sensor at the current altitude.

[0141] Of course, the computer executable instructions of a storage medium containing computer executable instructions provided in an embodiment of the present invention are not limited to the method operations described above, and can also execute related operations in the pressure compensation method of the palladium alloy thin film hydrogen sensor provided in any embodiment of the present invention.

[0142] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (FLASH), a hard disk or an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0143] It is worth noting that in the embodiment of the above-mentioned palladium alloy thin film hydrogen sensor pressure compensation device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0144] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A palladium alloy thin film hydrogen sensor pressure compensation method, characterized in that: include: Obtain the actual measured ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude; Obtaining the hydrogen partial pressure value of the hydrogen to be measured according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration; The ratio of the hydrogen partial pressure value to the measured ambient atmospheric pressure value is calculated, and the ratio is used as a volume fraction measurement value of the hydrogen to be measured by the palladium alloy thin film hydrogen sensor at the current altitude.

2. The palladium alloy thin film hydrogen sensor pressure compensation method according to claim 1, characterized in that: The fitting curve relationship is expressed as a functional relationship between the output resistance value of the palladium alloy thin film hydrogen sensor and the standard hydrogen partial pressure value; Accordingly, the hydrogen partial pressure value of the hydrogen to be measured is obtained according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration, including: Substitute the current output resistance value into the functional relationship to find the hydrogen partial pressure value.

3. The palladium alloy thin film hydrogen sensor pressure compensation method according to claim 1, characterized in that: The fitting curve relationship is represented by a mapping data table of the output resistance value of the palladium alloy thin film hydrogen sensor with respect to the standard hydrogen partial pressure value; Accordingly, the hydrogen partial pressure value of the hydrogen to be measured is obtained according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration, including: The mapping data table is queried according to the current output resistance value to obtain the hydrogen partial pressure value.

4. The palladium alloy thin film hydrogen sensor pressure compensation method according to claim 1, characterized in that: Before obtaining the ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude, the method further includes: Obtaining the ambient atmospheric pressure value when the palladium alloy thin film hydrogen sensor is factory calibrated, the volume fraction values ​​of a plurality of calibration hydrogen standard gases with different volume fractions, and a plurality of calibration output resistance values ​​obtained by the palladium alloy thin film hydrogen sensor measuring a plurality of the hydrogen standard gases; Obtaining the fitting curve relationship according to the ambient atmospheric pressure value, the plurality of volume fraction values, and the plurality of calibrated output resistance values; The palladium alloy thin film hydrogen sensor is calibrated using the fitting curve relationship.

5. The palladium alloy thin film hydrogen sensor pressure compensation method according to claim 4, characterized in that: The step of obtaining the fitting curve relationship according to the ambient atmospheric pressure value, the plurality of volume fraction values, and the plurality of calibrated output resistance values ​​comprises: Multiplying the ambient atmospheric pressure value by each of the plurality of volume fraction values ​​to obtain a standard hydrogen partial pressure value corresponding to each volume fraction value; Combining each of the plurality of standard hydrogen partial pressure values ​​and the calibrated output resistance values ​​corresponding to each of the plurality of calibrated output resistance values ​​into a group of calibration data, thereby obtaining a plurality of groups of calibration data; Curve fitting is performed based on the multiple groups of calibration data to obtain the fitting curve relationship.

6. A palladium alloy thin film hydrogen sensor pressure compensation device, characterized in that: include: The first acquisition module is used to obtain the actual measured ambient atmospheric pressure value at the current altitude and the current output resistance value of the palladium alloy thin film hydrogen sensor measuring the hydrogen to be measured at the current altitude; A hydrogen partial pressure acquisition module, used to obtain the hydrogen partial pressure value of the hydrogen to be measured according to the current output resistance value combined with the fitting curve relationship of the palladium alloy thin film hydrogen sensor during factory calibration; The ratio calculation module is used to use the ratio of the hydrogen partial pressure value to the measured ambient atmospheric pressure value as the volume fraction measurement value of the hydrogen to be measured by the palladium alloy thin film hydrogen sensor at the current altitude.

7. The palladium alloy thin film hydrogen sensor pressure compensation device according to claim 6, characterized in that: The fitting curve relationship is expressed as a functional relationship between the output resistance value of the palladium alloy thin film hydrogen sensor and the standard hydrogen partial pressure value; Accordingly, the hydrogen partial pressure acquisition module comprises: The numerical calculation unit is used to substitute the current output resistance value into the functional relationship to obtain the hydrogen partial pressure value.

8. The palladium alloy thin film hydrogen sensor pressure compensation device according to claim 6, characterized in that: The fitting curve relationship is represented by a mapping data table of the output resistance value of the palladium alloy thin film hydrogen sensor with respect to the standard hydrogen partial pressure value; Accordingly, the hydrogen partial pressure acquisition module comprises: The numerical query unit is used to query the mapping data table according to the current output resistance value to obtain the hydrogen partial pressure value.

9. A palladium alloy thin film hydrogen concentration transmitter, characterized in that: include: Palladium alloy thin film hydrogen sensor, air pressure sensor, central processing module and memory; The central processing module is electrically connected to the palladium alloy thin film hydrogen sensor, the air pressure sensor and the memory respectively; The palladium alloy thin film hydrogen sensor is used to obtain the current output resistance value of the hydrogen to be measured at the current altitude; The air pressure sensor is used to obtain the actual ambient atmospheric pressure value at the current altitude; The memory is used to store one or more programs; The one or more programs are executed by the central processing module, so that the central processing module implements the pressure compensation method for the palladium alloy thin film hydrogen sensor as described in any one of claims 1-5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the pressure compensation method for a palladium alloy thin film hydrogen sensor as described in any one of claims 1 to 5 is implemented.

Images