High-precision reading method of hydrogen in fuel cell system

Abstract

The present application discloses a high-precision hydrogen reading method for a fuel cell system, and relates to the field of bench testing of fuel cell systems. It includes: filtering the hydrogen gas of the flow to be read, and obtaining the hydrogen gas to be tested whose pressure value and purity meet the test requirements of the fuel cell system; obtaining multiple hydrogen gas reading pipelines according to the flow upper limit of the test bench, wherein the maximum range of the multiple hydrogen gas reading pipelines is arranged in stages according to the power upper limit and current upper limit of the preset test bench electronic load; reading the real-time flow of the hydrogen gas to be tested through the multiple hydrogen gas reading pipelines, and obtaining the read hydrogen gas; flowing the read hydrogen gas into the tested sample through a preset control valve, and discharging the excess read hydrogen gas. The hydrogen gas reading accuracy of the present invention is relatively high.

Description

Technical Field

[0001] The present application relates to the field of bench testing of fuel cell systems, and in particular to a high-precision hydrogen reading method for fuel cell systems. Background Art

[0002] Fuel cells, as a highly efficient and pollution-free energy conversion device, have been widely promoted in the automotive field. Bench testing is an important verification method before actual vehicle testing, which can save vehicle debugging time and cost, and is a very important part.

[0003] Fuel cell performance testing and optimization calibration are indispensable parts of bench testing, and optimization of hydrogen utilization efficiency is of utmost importance. In order to meet the requirements of downward compatibility of the bench power upper limit and current upper limit, the fuel cell system test benches on the market currently adopt a parallel hydrogen pipeline connection method.

[0004] The hydrogen reading accuracy of the above-mentioned prior art solution is low, so it is necessary to improve it. Summary of the invention

[0005] The embodiment of the present application provides a method for high-precision reading of hydrogen in a fuel cell system to solve the problem of low hydrogen reading accuracy in the related art.

[0006] In order to solve the above technical problems, the present invention provides a high-precision hydrogen reading method for a fuel cell system, which comprises: filtering the hydrogen to be read to obtain the hydrogen to be tested whose pressure value and purity meet the test requirements of the fuel cell system; acquiring multiple hydrogen reading pipelines according to the flow upper limit of the test bench, wherein the maximum range of the multiple hydrogen reading pipelines is arranged in stages according to the preset power upper limit and current upper limit of the electronic load of the test bench; reading the real-time flow of the hydrogen to be tested through the multiple hydrogen reading pipelines to obtain the read hydrogen; and flowing the read hydrogen into the sample to be tested through a preset control valve, and discharging excess read hydrogen.

[0007] In some embodiments, the hydrogen gas at the flow rate to be read is filtered to obtain the hydrogen gas to be tested whose pressure value and purity meet the test requirements of the fuel cell system, including: allowing the hydrogen gas at the flow rate to be read to enter the test bench; using a pressure sensor and a manual pressure reducing valve to make the pressure value of the hydrogen gas at the flow rate to be read meet the test requirements of the fuel cell system; and removing excess impurities in the hydrogen gas at the flow rate to be read through a filter to make the purity of the hydrogen gas at the flow rate to be read meet the test requirements of the fuel cell system, thereby obtaining the hydrogen gas to be tested.

[0008] In some embodiments, the maximum ranges of the plurality of hydrogen reading pipelines are arranged in stages according to the preset upper power limit and upper current limit of the electronic load of the test bench, including: obtaining the upper power limit and upper current limit of the electronic load of the test bench; calculating the upper limit of the hydrogen flow rate of the test bench according to formula (1), wherein formula (1) is: in, is the upper limit of hydrogen flow rate of the test bench, P max is the upper power limit of the electronic load, I stackmax is the current upper limit of the electronic load; according to the upper limit of the hydrogen flow rate, the maximum range of the hydrogen reading pipeline is respectively and The arrangement is performed, where both X1 and X2 are positive real numbers, and 0<X1≤X2≤100.

[0009] In some embodiments, the method of obtaining multiple hydrogen reading pipelines according to the flow upper limit of the test bench includes: setting up three hydrogen reading pipelines, and arranging a flow meter corresponding to the maximum range of the hydrogen reading pipeline on each hydrogen reading pipeline, to obtain multiple hydrogen reading pipelines.

[0010] In some embodiments, the real-time flow of the hydrogen to be measured is read through multiple hydrogen reading pipelines to obtain the read hydrogen, including: obtaining the real-time current value of the output end of the electronic load stack through a power divider, and dividing the real-time current value by the current upper limit of the electronic load to obtain the real-time current percentage value of the electronic load; according to the real-time current percentage value of the electronic load, a hydrogen reading pipeline corresponding to the real-time percentage of the flow is obtained, recorded as a flow reading pipeline; reading the real-time flow of the hydrogen to be measured through the flow reading pipeline to obtain the read hydrogen.

[0011] In some embodiments, the hydrogen reading pipeline corresponding to the real-time percentage of the flow rate is obtained according to the real-time current percentage value of the electronic load, which is recorded as the flow reading pipeline, and also includes: allowing the power divider to transmit the real-time current percentage value to a preset host computer; allowing the host computer to record the above current percentage value, and obtaining the hydrogen reading pipeline corresponding to the real-time percentage of the flow rate according to the current percentage value, to obtain the flow reading pipeline.

[0012] In some embodiments, the hydrogen reading pipeline corresponding to the real-time percentage of the flow rate is obtained according to the real-time percentage of the current of the electronic load, and is recorded as the flow reading pipeline, including: The hydrogen reading pipeline is called the first hydrogen pipeline, and the maximum range is The hydrogen reading pipeline is called the second hydrogen pipeline, and the maximum range is The hydrogen reading pipeline is called the third hydrogen pipeline; the real-time current percentage value of the electronic load is recorded as X0; if X0<X1, the first hydrogen pipeline is selected as the flow reading pipeline; if X1<X0≤X2, the second hydrogen pipeline is selected as the flow reading pipeline; if X2<X0≤100, the third hydrogen pipeline is selected as the flow reading pipeline; wherein, is the upper limit of the hydrogen flow rate of the test bench, X1 and X2 are both positive real numbers, and 0<X1≤X2≤100.

[0013] In some embodiments, the real-time flow of the hydrogen to be measured is read through the flow reading pipeline to obtain the read hydrogen, including: when the real-time current percentage value is in the range of 0 to X1, the first hydrogen pipeline is selected by the controller to read the real-time flow of the hydrogen to be measured to obtain the read hydrogen; when the real-time current percentage value is in the range of X1 to X2, the second hydrogen pipeline is used to read the real-time flow of the hydrogen to be measured to obtain the read hydrogen; when the real-time current percentage value is in the range of X2 to 100, the third hydrogen pipeline is used to read the real-time flow of the hydrogen to be measured to obtain the read hydrogen.

[0014] In some embodiments, the read hydrogen gas is allowed to flow into the sample under test through a preset control valve, and excess read hydrogen gas is discharged, including: allowing the read hydrogen gas to flow into a three-way valve after passing through a check valve, the three-way valve being connected to two outlet pipes, one of which is equipped with an explosion-proof solenoid valve, and the other is equipped with a pressure sensor, a temperature sensor and a manual ball valve; excess read hydrogen gas is discharged through one of the outlet pipes, and the read hydrogen gas is allowed to flow into the sample under test through the other outlet pipe.

[0015] In some embodiments, a plurality of the hydrogen reading pipelines are arranged in parallel or in series.

[0016] The embodiment of the present application provides a high-precision hydrogen reading method for a fuel cell system, which can flow hydrogen into a sample to be tested and discharge excess read hydrogen; at the same time, since the hydrogen to be tested can already meet the test requirements of the fuel cell system, the test hydrogen test results of the present invention are relatively accurate and feasible; the maximum ranges of the multiple hydrogen reading pipelines of the present invention are arranged in stages, so the present invention can use a hydrogen reading pipeline with a suitable range to read the real-time flow of the hydrogen to be tested, so that the present invention can make the hydrogen readings read by the flow meter more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of a process for a high-precision hydrogen reading method for a fuel cell system provided by the present invention;

[0019] Figure 2 is a structural schematic diagram of the high-precision hydrogen reading device for a fuel cell system of the present invention when multiple hydrogen reading pipelines are arranged in parallel;

[0020] Figure 3 It is a structural schematic diagram of the high-precision hydrogen reading device of the fuel cell system of the present invention when multiple hydrogen reading pipelines are arranged in series. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0022] The present application embodiment provides a method for high-precision hydrogen reading in a fuel cell system, which can solve the problem of low hydrogen reading accuracy in the related art. Figure 2 and Figure 3 As shown, Q1 and Q2 are manual ball valves; PT1 and PT2 are pressure sensors; FT1 is a filter; PRV1 is a manual pressure reducing valve; TM1, TM2, TM3, and TM4 are explosion-proof solenoid valves; FM1, FM2, and FM3 are flow meters; NR1, NR2, and NR3 are check valves; G1 is a three-way valve; TS1 is a temperature sensor; the controller controls the closing and opening of TM1, TM2, TM3, and TM4, and determines the type of flow meter read according to the current data transmitted by the host computer; the host computer receives the flow data of FM1, FM2, and FM3, records it, and transmits the current load current parameters to the controller; the power divider reads the current load current value and transmits it to the host computer so that the controller can determine the hydrogen flow branch selected for the current working condition.

[0023] like Figure 1 As shown, the schematic flow chart of the method for high-precision hydrogen reading of a fuel cell system of the present invention comprises the following steps:

[0024] S1. Filter the hydrogen gas whose flow rate is to be read to obtain the hydrogen gas to be tested whose pressure value and purity meet the fuel cell system test requirements;

[0025] In this step, the step of obtaining the hydrogen to be tested includes: S11, allowing the hydrogen to be read to enter the test bench; S12, allowing the pressure value of the hydrogen to be read to meet the test requirements of the fuel cell system through a pressure sensor and a manual pressure reducing valve; S13, removing excess impurities in the hydrogen to be read through a filter, so that the purity of the hydrogen to be read meets the test requirements of the fuel cell system, thereby obtaining the hydrogen to be tested.

[0026] In actual work, Figure 2 As shown, the hydrogen of the present invention enters from the test bench hydrogen line, and the excess impurities of the hydrogen are removed through the ball valve, pressure sensor and filter to meet the hydrogen purity and pressure requirements required for system testing, and finally enters the flow control reading segment after being reduced in pressure by the manual pressure reducing valve.

[0027] S2. Acquire multiple hydrogen gas reading pipelines according to the flow rate upper limit of the test bench, wherein the maximum ranges of the multiple hydrogen gas reading pipelines are arranged in stages according to the power upper limit and current upper limit of the preset test bench electronic load;

[0028] In this step, the step of obtaining multiple hydrogen reading pipelines includes: S21, setting three hydrogen reading pipelines, and arranging a flow meter corresponding to the maximum range of the hydrogen reading pipeline on each hydrogen reading pipeline, to obtain multiple hydrogen reading pipelines.

[0029] In this step, the step of arranging the plurality of hydrogen reading pipelines in stages includes: S22, obtaining the upper power limit and the upper current limit of the electronic load of the test bench; S23, calculating the upper limit of the hydrogen flow rate of the test bench according to formula (1), wherein formula (1) is: in, is the upper limit of hydrogen flow rate of the test bench, P max is the upper power limit of the electronic load, I stackmax is the current upper limit of the electronic load; S24, according to the upper limit of the hydrogen flow rate, the maximum range of the hydrogen reading pipeline is respectively and Arrange, where X1 and X2 are both positive real numbers, and 0 ＜ X1≤X2≤100.

[0030] In actual work, this step includes a power divider, a host computer, a controller, an explosion-proof solenoid valve, and three gas flow meters with different ranges. Specifically:

[0031] First, the upper limit of the bench flow rate is determined by the maximum output of the load.

[0032] Secondly, according to the load information, the current upper limit of the bench load (electronic load) is obtained as I stackmax , the power upper limit and current upper limit are P max ;

[0033] Next, considering that there is usually a hydrogen circulation pump or ejector inside the test sample, the excess ratio is set to 1.4 based on experience, and the single-chip voltage is calculated as 0.4V as the cutoff point. The upper limit of the hydrogen flow rate on the bench is the upper limit of the hydrogen flow rate.

[0034] Finally, since the flow meter value is generally accurate only when it is above 30% of the full scale, the three hydrogen flow meters on the test bench are selected as FM1, FM2, and FM3, with ranges of 100, 150, 200, and 300, respectively, while meeting the test requirements (generally the lowest point is idling, 10% of full power) and the number of hydrogen flow meters. To meet the requirements of hydrogen flow reading accuracy in different power ranges.

[0035] S3, reading the real-time flow of the hydrogen to be measured through the plurality of hydrogen reading pipelines to obtain the read hydrogen;

[0036] In this step, the step of obtaining the read hydrogen includes: S31, obtaining the real-time current value of the output end of the electronic load stack through the power divider, and dividing the real-time current value by the current upper limit of the electronic load to obtain the real-time current percentage value of the electronic load; S32, obtaining the hydrogen reading pipeline corresponding to the real-time percentage of the flow rate according to the real-time current percentage value of the electronic load, recorded as the flow reading pipeline; S33, reading the real-time flow of the hydrogen to be measured through the flow reading pipeline to obtain the read hydrogen.

[0037] In this step, the step of obtaining the flow reading pipeline includes: S321, allowing the power divider to transmit the real-time current percentage value to the preset host computer; S322, allowing the host computer to record the above current percentage value, and obtain the hydrogen reading pipeline corresponding to the real-time percentage of the flow according to the current percentage value, so as to obtain the flow reading pipeline.

[0038] In this step, the step of obtaining the flow reading pipeline also includes: S323, setting the maximum range to The hydrogen reading pipeline is called the first hydrogen pipeline, and the maximum range is The hydrogen reading pipeline is called the second hydrogen pipeline, and the maximum range is The hydrogen reading pipeline is called the third hydrogen pipeline; S324, the real-time current percentage value of the electronic load is recorded as X0; if X0<X1, the first hydrogen pipeline is selected as the flow reading pipeline; if X1<X0≤X2, the second hydrogen pipeline is selected as the flow reading pipeline; if X2<X0≤100, the third hydrogen pipeline is selected as the flow reading pipeline; wherein, is the upper limit of the hydrogen flow rate of the test bench, X1 and X2 are both positive real numbers, and 0<X1≤X2≤100.

[0039] In this step, the step of obtaining the read hydrogen includes: S331, when the real-time current percentage value is within the range of 0 to X1, the first hydrogen pipeline is selected by the controller to read the real-time flow of the hydrogen to be measured to obtain the read hydrogen; S332, when the real-time current percentage value is within the range of X1 to X2, the second hydrogen pipeline is used to read the real-time flow of the hydrogen to be measured to obtain the read hydrogen; S333, when the real-time current percentage value is within the range of X2 to 100, the third hydrogen pipeline is used to read the real-time flow of the hydrogen to be measured to obtain the read hydrogen.

[0040] In actual work, Figure 2 As shown, when a plurality of hydrogen gas reading pipelines are connected in parallel, if the power divider collects the current value at the output end of the electronic load stack between 0 and 30% I stackmax When the power divider collects the current value of the electronic load stack output terminal between 30% and 70% I stackmax When the power divider collects the current value of the electronic load stack output terminal between 70% and 100% I stackmax When , the host computer sends a signal to the controller to open the solenoid valve TM3, close TM1 and TM2, and collect the flow data of FM3. At this time, the host computer does not record the flow data of FM1 and FM3.

[0041] In actual work, Figure 3As shown, when multiple hydrogen reading pipelines are arranged in parallel, if the host computer controls the load power of the tested fuel cell system to be 0-30% of the upper limit power of the bench, the controller sends an instruction to the explosion-proof solenoid valve and the small-range flowmeter transmits hydrogen flow data to the host computer, and the medium-range flowmeter and the large-range flowmeter do not transmit data to the host computer; when the host computer controls the load power of the tested fuel cell system to be 30-70% of the upper limit power of the bench, the controller sends an instruction to the explosion-proof solenoid valve and the medium-range flowmeter transmits hydrogen flow data to the host computer, and the small-range flowmeter and the large-range flowmeter do not transmit data to the host computer; when the host computer controls the load power of the tested fuel cell system to be 70-100% of the upper limit power of the bench, the controller sends an instruction to the explosion-proof solenoid valve and the large-range flowmeter transmits hydrogen flow data to the host computer, and the small-range flowmeter and the medium-range flowmeter do not transmit data to the host computer.

[0042] S4. The read hydrogen gas flows into the sample to be tested through a preset control valve, and the excess read hydrogen gas is discharged.

[0043] In this step, the read hydrogen gas flows into the sample to be tested, and the excess read hydrogen gas is discharged, including:

[0044] S41, allowing the read hydrogen to flow into the three-way valve after passing through the check valve, the three-way valve being connected to two outlet pipes, one of which is equipped with an explosion-proof solenoid valve, and the other is equipped with a pressure sensor, a temperature sensor and a manual ball valve;

[0045] S42, exhausting the excess hydrogen gas through one of the gas outlet pipes, and allowing the hydrogen gas to flow into the sample under test through the other gas outlet pipe.

[0046] In actual operation, a plurality of hydrogen gas reading pipelines may be arranged in parallel (e.g. Figure 2 As shown), it can also be set in series (as shown Figure 3 shown).

[0047] In order to more clearly illustrate the technical solution of the present invention, Figure 2 (in parallel) and specific examples illustrate the scheme of the present invention:

[0048] The power and current limits of a test bench are 100kW and 600A, respectively. To meet the upper limit of the test bench, according to the formula The upper limit of hydrogen flow is 2500slpm, so three flow meters with different flow ranges are installed in the hydrogen line, namely small flow meter FM1: 0-750slpm; medium flow meter FM2: 0-1750slpm; large flow meter FM3: 0-2500slpm.

[0049] After the hydrogen passes through the ball valve Q1, pressure sensor PT1, filter FT1 and is adjusted to the appropriate pressure by the manual pressure reducing valve PRV1, it enters the flow control reading segment.

[0050] When the power divider reads that the current of the sample under test is between 0 and 180A, the host computer sends a signal to the controller to open the solenoid valve TM1 and collect the flow data of FM1. At this time, TM2 and TM3 are closed and the host computer does not record the flow data of FM2 and FM3.

[0051] When the power divider reads that the current of the sample under test is between 180 and 420 A, the host computer sends a signal to the controller to open the solenoid valve TM2 and collect the flow data of FM2. At this time, TM1 and TM3 are closed and the host computer does not record the flow data of FM1 and FM3.

[0052] When the power divider reads that the current of the measured sample is between 420 and 600 A, the host computer sends a signal to the controller to open the solenoid valve TM3 and collect the flow data of FM3. At this time, TM1 and TM2 are closed and the host computer does not record the flow data of FM1 and FM2.

[0053] After the hydrogen is segmented by flow control reading, it passes through the three-way valve G1, and then passes through the pressure sensor PT2 and the temperature sensor TS1 before entering the fuel cell system under test.

[0054] The ball valve Q2 is in a normally open state when the fuel cell system under test is in operation. The explosion-proof battery valve TM4 is in a normally closed state when the fuel cell system under test is in operation. TM4 is opened for exhaust when the test bench needs to replace gas.

[0055] In order to more clearly illustrate the technical solution of the present invention, Figure 3 (in series) and specific examples illustrate the scheme of the present invention:

[0056] The power limit of a test bench is 100kW. The hydrogen passes through the ball valve Q1, pressure sensor PT1 and filter FT1. After being adjusted to the appropriate pressure by the manual pressure reducing valve PRV1, it enters the flow control reading segment.

[0057] When the host computer sends a system output power instruction to the controlled fuel cell system and it is between 0-30kW, the controller controls the explosion-proof solenoid valve TM1 to open, and the hydrogen passes through the hydrogen flow meter FM1 and uploads the read data to the host computer for storage. At this time, FM2 and FM3 do not upload data to the host computer, and the check valve NR1 prevents hydrogen from flowing back.

[0058] When the host computer sends a system output power instruction to the controlled fuel cell system and it is between 30-70kW, the controller controls the explosion-proof solenoid valve TM1 to open, and the hydrogen passes through the hydrogen flow meter FM2 and uploads the read data to the host computer for storage. At this time, FM1 and FM3 do not upload data to the host computer, and the check valve NR1 prevents hydrogen from flowing back.

[0059] When the host computer sends a system output power instruction to the controlled fuel cell system and it is between 70-100kW, the controller controls the explosion-proof solenoid valve TM1 to open, and the hydrogen passes through the hydrogen flow meter FM3 and uploads the read data to the host computer for storage. At this time, FM1 and FM2 do not upload data to the host computer, and the check valve NR1 prevents hydrogen from flowing back.

[0060] After the hydrogen is segmented by flow control reading, it passes through the three-way valve G1, and then passes through the pressure sensor PT2 and the temperature sensor TS1 before entering the fuel cell system under test.

[0061] The ball valve Q2 is in a normally open state when the fuel cell system under test is in operation. The explosion-proof battery valve TM4 is in a normally closed state when the fuel cell system under test is in operation. TM4 is opened for exhaust when the test bench needs to replace gas.

[0062] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0063] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0064] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A high-precision hydrogen reading method for a fuel cell system, characterized in that: It includes: Filtering the hydrogen gas whose flow rate is to be read to obtain the hydrogen gas to be tested whose pressure value and purity meet the fuel cell system test requirements; Acquire multiple hydrogen gas reading pipelines according to the flow upper limit of the test bench, wherein the maximum ranges of the multiple hydrogen gas reading pipelines are arranged in stages according to the power upper limit and the current upper limit of the preset test bench electronic load; Reading the real-time flow of the hydrogen to be measured through the plurality of hydrogen reading pipelines to obtain the read hydrogen; The read hydrogen gas flows into the sample to be tested through a preset control valve, and the excess read hydrogen gas is discharged; The maximum ranges of the plurality of hydrogen gas reading pipelines are arranged in stages according to the preset upper power limit and upper current limit of the electronic load of the test bench, including: Obtaining the upper power limit and the upper current limit of the electronic load of the test bench; The upper limit of the hydrogen flow rate of the test bench is calculated according to formula (1), wherein formula (1) is: in, is the upper limit of hydrogen flow rate of the test bench, P max is the upper power limit of the electronic load, I stackmax is the upper limit of the current of the electronic load; According to the upper limit of the hydrogen flow rate, the maximum range of the hydrogen reading pipeline is respectively and The arrangement is performed, wherein X1 and X2 are both in real time and 0<X1≤X2≤100.

2. The method for high-precision hydrogen reading of a fuel cell system according to claim 1, characterized in that: The filtering process of the hydrogen gas whose flow rate is to be read to obtain the hydrogen gas to be tested whose pressure value and purity meet the fuel cell system test requirements includes: Allow the hydrogen gas whose flow rate is to be read to enter the test bench; The pressure sensor and the manual pressure reducing valve are used to make the pressure value of the hydrogen gas to be read meet the test requirements of the fuel cell system; The excess impurities in the hydrogen gas at the flow rate to be read are removed by a filter so that the purity of the hydrogen gas at the flow rate to be read meets the fuel cell system test requirement, thereby obtaining the hydrogen gas to be tested.

3. The method for high-precision hydrogen reading of a fuel cell system according to claim 1, characterized in that: The method of obtaining a plurality of hydrogen reading pipelines according to the flow upper limit of the test bench includes: Three hydrogen reading pipelines are set up, and a flow meter corresponding to the maximum range of the hydrogen reading pipeline is arranged on each hydrogen reading pipeline to obtain a plurality of hydrogen reading pipelines.

4. The method for high-precision hydrogen reading of a fuel cell system according to claim 1, 2 or 3, characterized in that: The method of reading the real-time flow of the hydrogen to be measured through the plurality of hydrogen reading pipelines to obtain the read hydrogen includes: The real-time current value of the electronic load stack output terminal is obtained by a power divider, and the real-time current value is divided by the current upper limit of the electronic load to obtain the real-time current percentage value of the electronic load; According to the real-time current percentage value of the electronic load, a hydrogen reading pipeline corresponding to the real-time flow percentage is obtained, which is recorded as a flow reading pipeline; The real-time flow rate of the hydrogen to be measured is read through the flow reading pipeline to obtain the read hydrogen.

5. The method for high-precision hydrogen reading of a fuel cell system according to claim 4, characterized in that: The hydrogen reading pipeline corresponding to the real-time percentage of the flow rate is obtained according to the real-time current percentage value of the electronic load, which is recorded as a flow reading pipeline, and further includes: Let the power divider transmit the real-time current percentage value to the preset host computer; The host computer is made to record the current percentage value, and obtain the hydrogen reading pipeline corresponding to the real-time percentage of the flow rate according to the current percentage value, so as to obtain the flow reading pipeline.

6. The method for high-precision hydrogen reading of a fuel cell system according to claim 5, characterized in that: The method of obtaining a hydrogen reading pipeline corresponding to the real-time percentage of flow rate according to the real-time percentage of the current of the electronic load is referred to as a flow reading pipeline, and includes: Set the maximum range to The hydrogen reading pipeline is called the first hydrogen pipeline, and the maximum range is The hydrogen reading pipeline is called the second hydrogen pipeline, and the maximum range is The hydrogen reading pipeline is called the third hydrogen pipeline; The real-time current percentage value of the electronic load is recorded as X0; If X0<X1, the first hydrogen pipeline is selected as the flow reading pipeline; If X1<X0≤X2, the second hydrogen pipeline is selected as the flow reading pipeline; If X2<X0≤100, the third hydrogen pipeline is selected as the flow reading pipeline; in, is the upper limit of the hydrogen flow rate of the test bench, X1 and X2 are both positive real time, and 0<X1≤X2≤100.

7. The method for high-precision hydrogen reading of a fuel cell system according to claim 6, characterized in that: The real-time flow rate of the hydrogen to be measured is read through the flow reading pipeline to obtain the read hydrogen, including: When the real-time current percentage value is within the range of 0 to X1, the controller selects the first hydrogen pipeline to read the real-time flow of the hydrogen to be measured to obtain the read hydrogen; When the real-time current percentage value is within the range of X1 to X2, the real-time flow rate of the hydrogen to be measured is read using the second hydrogen pipeline to obtain the read hydrogen; When the real-time current percentage value is within the range of X2 to 100, the real-time flow rate of the hydrogen to be measured is read using the third hydrogen pipeline to obtain the read hydrogen.

8. The method for high-precision hydrogen reading of a fuel cell system according to claim 7, characterized in that: The method of flowing the read hydrogen gas into the sample under test through a preset control valve and discharging excess read hydrogen gas comprises: The hydrogen gas is allowed to flow into the three-way valve after passing through the check valve. The three-way valve is connected to two outlet pipes, one of which is equipped with an explosion-proof solenoid valve, and the other is equipped with a pressure sensor, a temperature sensor and a manual ball valve. Excess hydrogen gas that has been read is discharged through one of the gas outlet pipes, and the hydrogen gas that has been read is flowed into the sample to be tested through the other gas outlet pipe.

9. The method for high-precision hydrogen reading of a fuel cell system according to claim 8, characterized in that: The plurality of hydrogen reading pipelines are arranged in parallel or in series.

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