CN114899456B - Pulse ejector testing device and method for fuel cell - Google Patents
Pulse ejector testing device and method for fuel cell Download PDFInfo
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- 238000009448 modified atmosphere packaging Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
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- 239000001257 hydrogen Substances 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 9
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04097—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with recycling of the reactants
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04305—Modeling, demonstration models of fuel cells, e.g. for training purposes
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
- H01M8/04432—Pressure differences, e.g. between anode and cathode
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a pulse type ejector testing device for a fuel cell, which comprises a switch valve, wherein the input end of the switch valve is communicated with an air source, the output end of the switch valve is communicated with a pressure reducing valve, the output end of the pressure reducing valve is communicated with a gas-liquid heat exchanger, the gas-liquid heat exchanger is simultaneously communicated with a first electric control regulating valve, an electric control stop valve and a temperature regulating device, the first electric control regulating valve is communicated with the temperature regulating device, the temperature regulating device is communicated with a pressure buffer tank through a second electric control regulating valve, the electric control stop valve is communicated with the ejector, the ejector is simultaneously communicated with the pressure buffer tank and the electric control proportional valve, the electric control proportional valve is communicated with the pressure buffer tank, a first flowmeter is arranged on a pipeline between the electric control proportional valve and the pressure buffer tank, and the pressure buffer tank is communicated with a second flowmeter; the device has the advantages of simple structure, good test effect and the like.
Description
Technical Field
The invention relates to the technical field of pulse type ejector working condition testing, in particular to a pulse type ejector testing device for a fuel cell.
Background
The anode subsystem of a proton exchange membrane fuel cell system typically uses a hydrogen circulation pump or/and an ejector to deliver the stack outlet gas to the stack inlet, thereby achieving the recycling of unreacted hydrogen and humidifying the hydrogen entering the stack. The ejector is used for conveying fluid in the anode subsystem, and utilizes high-pressure hydrogen gas from a proportional valve or a hydrogen injection valve to form high-speed jet flow at the position of a nozzle and form a low-pressure area around the nozzle so as to suck gas at the outlet of a pile of the proton exchange membrane fuel cell system. The gas exchanges energy in the mixing pipeline and the diffusion pipeline of the ejector, so that low-pressure gas is converted into high-pressure gas, and the circulation of hydrogen is realized. The pulse type ejector is characterized in that hydrogen is intermittently sprayed into the ejector by utilizing a hydrogen spraying valve, so that a pulsation effect is realized. The pulse type ejector can improve the drainage efficiency of the fuel cell stack and improve the drainage rate of impurities. And simultaneously, nitrogen in the dead zone of the anode can be effectively discharged.
While there are more and more fuel cell systems using ejectors, ejector fuel cell systems are still immature with respect to hydrogen circulation pumps, and understanding of ejectors is still inadequate. In particular, for pulsed ejectors, no relevant test equipment has been proposed since little use has been made. The current patents CN_213779475_U, CN_110838591_A, CN_111816898_A, CN_215893992_U and the like are all experimental under the condition of steady-state working condition (stable flow of the injector), and cannot be measured for a system with large fluctuation, such as a pulse injector.
Therefore, the pulse injector testing device and the pulse injector testing method for the fuel cell can solve the problems.
Disclosure of Invention
The invention aims to solve the technical problems that the current experiment is only carried out under the condition of steady-state working condition (stable flow of an injector), and the measurement cannot be carried out on a system with large fluctuation, namely a pulse injector, so that the invention provides a pulse injector testing device and a method for a fuel cell, wherein the pulse injector testing device and the method for the fuel cell comprise the following steps:
the switching valve, the input of switching valve is linked together with the air supply, the output is linked together with the relief pressure valve, the output of relief pressure valve is linked together with the gas-liquid heat exchanger, the gas-liquid heat exchanger is linked together with first automatically controlled governing valve simultaneously, automatically controlled stop valve and temperature regulating device, first automatically controlled governing valve is linked together with temperature regulating device, temperature regulating device is linked together with the pressure buffer tank through the automatically controlled governing valve of second, automatically controlled stop valve is linked together with the sprayer, sprayer and injector are linked together with pressure buffer tank and automatically controlled proportional valve simultaneously, automatically controlled proportional valve is linked together with pressure buffer tank, be provided with first flowmeter on the pipeline between automatically controlled proportional valve and the pressure buffer tank, all be provided with testing mechanism on the pipeline between sprayer and the automatically controlled proportional valve and the pressure buffer tank, the pressure buffer tank is linked together with the second flowmeter, the second flowmeter is linked together with first automatically controlled proportional valve and second automatically controlled proportional valve simultaneously, first automatically controlled proportional valve and second automatically controlled proportional valve are linked together with the export simultaneously.
The pressure buffer tank is provided with a deflation port, an input port and an exhaust port, the deflation port is communicated with the second flowmeter, the input port is communicated with the ejector, and the exhaust port is communicated with the first flowmeter.
The pressure buffer tank is also internally provided with a refrigerant coil, one end of the refrigerant coil is communicated with the temperature regulating device, and the other end of the refrigerant coil is communicated with the second electric control regulating valve.
The detection mechanism comprises a first pressure sensor, a first temperature sensor, a second pressure sensor, a third temperature sensor and a third pressure sensor, wherein the first pressure sensor and the first temperature sensor are sequentially arranged on a pipeline between the electric control stop valve and the ejector, the second pressure sensor and the temperature sensor are sequentially arranged on a pipeline between the electric control proportional valve and the ejector, and the third temperature sensor and the third pressure sensor are arranged on the pressure buffer tank.
On the other hand, the invention provides a testing method of a pulse injector for a fuel cell, which comprises the following steps:
calibrating the flow of the injector, and marking the calibration process as S;
calibrating the discharge flow rate of the pressure buffer tank, and marking the calibration process as SS;
testing a pulse ejector; the test procedure was noted as SSS.
Calibrating the flow of the injector, wherein the calibrating process is marked as S and comprises the following steps:
s1, closing an electric control proportional valve and a second electric control regulating valve, wherein the first electric control proportional regulating valve and the second electric control proportional regulating valve are in a complete opening state;
s2 the injector is first set to a target frequency and a target pulse width, and the pressure reducing valve is adjusted so that the average value P of the pressure values displayed by the first pressure sensor average For the target pressure value P main ；
S3 as P average ＝P main When the temperature value output by the temperature regulating device is regulated to be higher than the target temperature value T main 0.5 ℃, wherein T main Is equal to the value displayed by the first temperature sensor, and simultaneously adjusts the opening of the first electric control adjusting valve, and the refrigerant flow flowing into the gas-liquid heat exchanger is adjusted through the opening of the first electric control adjusting valve until the value T displayed by the first temperature sensor 1302 ＝T main ；
S4 recording the flow value q in the second flowmeter main ；
S5, repeating the steps S2-S4 for different working condition ranges, and finally obtaining a flow MAP of the injector in the set temperature, frequency and pulse width ranges.
Different working conditions include: one condition every 5 ℃ in a preset temperature range, one condition every 5Hz in a preset frequency range, and one condition every 2ms in a preset pulse width range.
Calibrating the discharge flow rate of the pressure buffer tank, wherein the calibration process is recorded as SS and comprises the following steps:
the SS1 takes down the ejector from the loop and directly communicates the electric control stop valve with the inlet of the ejector;
SS2 closes the electric control proportional valve, the first electric control proportional regulating valve and the second electric control proportional regulating valve, opens the electric control stop valve, and slowly opens the pressure reducing valve to enable the pressure value P shown by the third pressure sensor to be the same as the pressure value P shown by the third pressure sensor 1306 Rising to the target pressure P back_target Afterwards; maintaining the pressure regulating state of the pressure reducing valve clock at the target pressure;
the SS3 slowly opens the first electric control proportional regulating valve and records the opening-flow curve of the first electric control proportional regulating valve;
after the first electric control proportional regulating valve is fully opened, the SS4 is kept in a fully opened state, the second electric control proportional regulating valve is slowly opened, and an opening-flow curve of the second electric control proportional regulating valve is recorded;
SS5 closes the first and second electronically controlled proportional control valves;
SS6 repeats SS2-SS5 for each target pressure value, thereby obtaining opening-flow curve MAP MAPs at different pressures.
The initial pressure value of the third pressure sensor is 1.2bar under the initial pressure state of the pressure buffer tank;
1.2bar to 3.5bar at intervals of 0.2bar is a target pressure value.
Testing a pulse ejector; recording the test procedure as SSS includes:
the SSS1 is arranged back to the ejector, so that the inlet end of the ejector is communicated with the electric control stop valve, and the outlet end of the ejector is communicated with the inlet of the ejector;
the SSS2 is used for closing the electric control proportional valve, the first electric control regulating valve and the second electric control regulating valve, and the first electric control proportional regulating valve and the second electric control proportional regulating valve are in a completely opened state;
SSS3 sets the injector at a set injection frequency f, pulse width τ, and interpolates from MAP_injector to obtain the actual injector flow q m_target ；
The temperature value output by the SSS4 regulating temperature regulating device is higher than the target temperature value T main (recorded as the value displayed by the first temperature sensor) of 0.5 ℃, and simultaneously adjusting the opening of the first electric control regulating valve to further adjust the flow of the refrigerant flowing into the gas-liquid heat exchanger until the value T displayed by the first temperature regulating device 1302 ＝T main ；
SSS5 based on a given ejector target backpressure P back_target Target flow rate q m_target Interpolation is carried out on MAP_backstP_opening to obtain opening values of the first electric control proportional control valve and the second electric control proportional control valve;
SSS6 adjusts the electric control proportional valve to enable the pressure in the pressure buffer tank to be the pressure value P shown by the third pressure sensor 1306 With the pressure value P of the inlet of the ejector 1304 Pressure difference Δp=p of (a) 1306 -P 1304 Is a set pressure differential;
SSS7 adjusts the second electrically controlled regulating valve to increase the flow rate to enable the temperature in the pressure buffer tank (namely the temperature T displayed by the third temperature sensor 1305 ) Corresponds to a target temperature;
SSS8 pressure P in pressure buffer tank 1306 Variance value of (2)
Continuously less than the target variance value delta target At this time, recording of the second flowmeter (q 1403 ) And a first flowmeter 11 (q 11 ) In (1), wherein
Is the pressure P 1306 Transient average value of every 100 points:
i is the current count point.
SSS9: injection ratio rr=q for this condition 11/ q 1403 。
The implementation of the invention has the following beneficial effects:
1. the invention has simple structure principle, can truly restore the back pressure of the ejector, simulate the consumption of a galvanic pile and the pressure difference between the ejection port and the backflow port of the ejector under the pulsation condition, truly reflect the transient and steady-state characteristics of the ejector, and perfect the vacancy in the aspect of testing the pulse-type ejector.
Drawings
FIG. 1 is a system topology of a test apparatus of the present invention;
FIG. 2 is a graph of upstream pressure versus time for an injector of the present invention operating;
FIG. 3 is a graph showing upstream flow over time for an injector of the present invention operating;
FIG. 4 is a topology of a pressure buffer tank flow calibration circuit of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1-4 of the specification, the technical problem to be solved in this embodiment is that the current experiment is only performed under the condition of steady-state working condition (stable flow of the injector), and the measurement cannot be performed on a system with large fluctuation, such as a pulse injector, so a pulse injector testing device and method for a fuel cell are provided, and the pulse injector testing device and method for a fuel cell comprise:
the switching valve 2, the input of switching valve 2 is linked together with air supply 1, the output is linked together with relief valve 3, the output of relief valve 3 is linked together with gas-liquid heat exchanger 4, gas-liquid heat exchanger 4 is linked together with first automatically controlled governing valve 501, automatically controlled stop valve 7 and temperature regulating device 6 simultaneously, first automatically controlled governing valve 501 is linked together with temperature regulating device 6, temperature regulating device 6 is linked together with pressure buffer tank 12 through second automatically controlled governing valve 502, automatically controlled stop valve 7 is linked together with sprayer 8, sprayer 8 and ejector 9 are linked together, ejector 9 is linked together with pressure buffer tank 12 and automatically controlled proportional valve 10 simultaneously, automatically controlled proportional valve 10 is linked together with pressure buffer tank 12, be provided with first flowmeter 11 on the pipeline between automatically controlled proportional valve 10 and pressure buffer tank 12, on the pipeline between sprayer 8 and ejector 9 and automatically controlled proportional valve 10 and on pressure buffer tank 12 all be provided with test mechanism, pressure buffer tank 12 is linked together with second flowmeter 1403, second flowmeter is linked together with first automatically controlled proportional valve and second automatically controlled proportional valve simultaneously, first automatically controlled proportional valve and second electronically controlled proportional valve is linked together with the outlet.
The pressure buffer tank 12 is provided with a purge port 1201, an input port 1202, and a discharge port 1203, the purge port is communicated with the second flowmeter 1403, the input port 1202 is communicated with the ejector 9, and the discharge port 1203 is communicated with the first flowmeter 11.
The pressure buffer tank 12 is also provided with a refrigerant coil 15, one end of the refrigerant coil is communicated with the temperature regulating device 6, and the other end of the refrigerant coil is communicated with the second electric control regulating valve 502.
The detection mechanism includes a first pressure sensor 1301, a first temperature sensor 1302, a second temperature sensor 1303, a second pressure sensor 1304, a third temperature sensor 1305 and a third pressure sensor 1306, the first pressure sensor 1301 and the first temperature sensor 1302 are sequentially disposed on a pipeline between the electrically controlled shut-off valve 7 and the injector 8, the second pressure sensor 1304 and the temperature sensor are sequentially disposed on a pipeline between the electrically controlled proportional valve 10 and the injector 9, and the third temperature sensor 1305 and the third pressure sensor 1306 are disposed on the pressure buffer tank 12.
In the present invention, the working fluid (hydrogen, nitrogen) flows out from the gas source 1, through the on-off valve 2 and into the pressure reducing valve 3. The pressure reducing valve 3 is used to set the inlet pressure of the injector 8 (the value of the first pressure sensor 1301) to a target value.
The gas-liquid heat exchanger 4 is configured to exchange heat between the refrigerant in the temperature adjustment device 6 and the gas flowing through the interior thereof, and the first electronically controlled adjustment valve 501 is configured to adjust the flow rate of the refrigerant flowing out of the temperature adjustment device 6 so that the gas passing through the heat exchanger 4 reaches a target temperature (a value indicated by the first temperature sensor 1302).
The electrically controlled shut-off valve 7 is used for opening and shutting off the gas path to the injector 8 and for playing a role in shutting off the gas path to prevent loss expansion when the injector 8 fails.
The gas is injected in pulses into the injector 9 and then flows to the pressure buffer tank 12. The pressure buffer tank 12 is a cylindrical tank body. The two ends of the tank body are gas inlets and outlets, and a deflation port 1201 is arranged in the middle of the tank body and is connected with a second flowmeter 1403. Two electrically controlled proportional control valves 1401 and 1402 connected in parallel are connected to a second flow meter 1403 for simulating the flow q consumed by the stack com Wherein the first electrically controlled proportional regulator 1401 is a valve with a smaller adjustable flow (smaller ball valve inner diameter or flat valve seat throat) and the second electrically controlled proportional regulator 1402 is a valve with a larger adjustable flow.
The pressure buffer tank 12 is additionally provided with a refrigerant coil 15 for being connected with the temperature adjusting device 6, so as to achieve the purpose of adjusting the temperature of the gas flowing back into the ejector 9 (the temperature shown by the second temperature sensor 1303).
Part of the gas in the pressure tank flows out through the air release port 1201, and the other part of the gas flows back into the first flowmeter 11 through the outlet 1203 of the pressure buffer tank 12, passes through the electronically controlled proportional valve 10, and finally flows back into the return port of the ejector 9.
On the other hand, the invention provides a method for testing the pulse injector 9 for the fuel cell, which comprises the following steps:
calibrating the flow of the ejector 8, and marking the calibration process as S;
calibrating the discharge flow rate of the pressure buffer tank 12, and marking the calibration process as SS;
testing a pulse ejector 9; the test procedure was noted as SSS.
Calibrating the flow of the ejector 8, wherein the calibrating process is denoted as S and comprises:
s1, the electronic control proportional valve 10 and the second electronic control regulating valve 502 are closed, and the first electronic control proportional regulating valve 1401 and the second electronic control proportional regulating valve 1402 are in a completely opened state;
s2 the injector 8 is first set to the target frequency and the target pulse width, and the pressure reducing valve 3 is adjusted so that the average value P of the pressure values displayed by the first pressure sensor 1301 average For the target pressure value P main ；
S3 as P average ＝P main At the time, the temperature value output by the temperature regulating device 6 is regulated to be higher than the target temperature value T main 0.5 ℃, wherein T main Is equal to the value displayed by the first temperature sensor 1302, and simultaneously adjusts the opening degree of the first electric control adjusting valve 501, thereby adjusting the flow rate of the refrigerant flowing into the gas-liquid heat exchanger 4 until the value T displayed by the first temperature sensor 1302 1302 ＝T main ；
S4 recording the flow value q in the second flowmeter 11 main ；
S5, repeating the steps S2-S4 for different working condition ranges, and finally obtaining a flow MAP of the injector 8 in the set temperature, frequency and pulse width ranges.
Different working conditions include: one condition every 5 ℃ in a preset temperature range, one condition every 5Hz in a preset frequency range, and one condition every 2ms in a preset pulse width range.
Calibrating the discharge flow rate of the pressure buffer tank 12, the calibration process is denoted as SS, including:
the SS1 takes down the ejector 8 from the loop and directly communicates the electric control stop valve 7 with the inlet of the ejector 9;
SS2 closes electronically controlled proportional valve 10, the first electronically controlled proportional control valve and the second electronically controlled proportional control valve, opens electronically controlled shut-off valve 7, and slowly opens pressure reducing valve 3 to enable pressure value P shown by third pressure sensor 1306 to be the same as pressure value P shown by third pressure sensor 1306 1306 Rising to the target pressure P back_target Afterwards; maintaining the pressure regulating state of the pressure reducing valve 3 clock at the target pressure;
the SS3 slowly opens the first electric control proportional regulating valve and records the opening-flow curve of the first electric control proportional regulating valve;
after the first electric control proportional regulating valve is fully opened, the SS4 is kept in a fully opened state, the second electric control proportional regulating valve is slowly opened, and an opening-flow curve of the second electric control proportional regulating valve is recorded;
SS5 closes the first and second electronically controlled proportional control valves;
SS6 repeats SS2-SS5 for each target pressure value, thereby obtaining opening-flow curve MAP MAPs at different pressures.
The initial pressure in the pressure buffer tank 12 is 1.2bar, i.e. the initial value of the third pressure sensor 1306 is 1.2bar;
1.2bar to 3.5bar at intervals of 0.2bar is a target pressure value.
Testing a pulse ejector 9; recording the test procedure as SSS includes:
the SSS1 is arranged back to the ejector 8, so that the inlet end of the ejector 8 is communicated with the electric control stop valve 7, and the outlet end is communicated with the inlet of the ejector 9;
the SSS2 closes the electric control proportional valve 10, the first electric control regulating valve 501 and the second electric control regulating valve 502, and the first electric control proportional regulating valve and the second electric control proportional regulating valve are in a completely opened state;
SSS3 lets injector 8 at the set injection frequency f, pulse width τ, and interpolates according to MAP_injectorObtaining the actual ejector 8 flow q m_target ；
The SSS4 adjusts the temperature value output by the temperature adjusting device 6 to be higher than the target temperature value T main (recorded as the value displayed by the first temperature sensor 1302) of 0.5 ℃ and simultaneously adjusting the opening of the first electric control regulating valve 501, thereby adjusting the flow rate of the refrigerant flowing into the gas-liquid heat exchanger 4 until the value T displayed by the first temperature regulating device 6 1302 ＝T main ；
SSS5 based on a given ejector 9 target backpressure P back_target Target flow rate q m_target Interpolation is carried out on MAP_backstP_opening to obtain opening values of the first electric control proportional control valve and the second electric control proportional control valve;
the SSS6 adjusts the electronically controlled proportional valve 10 such that the pressure in the pressure buffer vessel 12 is at a pressure value P indicated by the third pressure sensor 1306 1306 And the pressure value P at the inlet of the ejector 9 1304 Pressure difference Δp=p of (a) 1306 -P 1304 Is a set pressure differential;
SSS7 regulates the second electronically controlled regulator 502 to increase the flow rate such that the temperature in the pressure buffer tank 12 (i.e., the temperature T shown by the third temperature sensor 1305 1305 ) Corresponds to a target temperature;
SSS8 as pressure P in pressure buffer tank 12 1306 Variance value of (2)
Continuously less than the target variance value delta target At this time, recording of the second flowmeter 1403 (q 1403 ) And a first flowmeter 11 (q 11 ) In (1), wherein
Is the pressure P 1306 Transient average value of every 100 points:
i is the current count point.
SSS9：Injection ratio rr=q for this condition 11/ q 1403 。
In the description of the present invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "another end," "upper," "one side," "top," "inner," "front," "center," "two ends," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The pulse injector testing device for the fuel cell is characterized by comprising a switch valve, wherein the input end of the switch valve is communicated with an air source, the output end of the switch valve is communicated with a pressure reducing valve, the output end of the pressure reducing valve is communicated with a gas-liquid heat exchanger, the gas-liquid heat exchanger is simultaneously communicated with a first electric control regulating valve, an electric control stop valve and a temperature regulating device, the first electric control regulating valve is communicated with the temperature regulating device, the temperature regulating device is communicated with a pressure buffer tank through a second electric control regulating valve, the electric control stop valve is communicated with the injector, the injector is simultaneously communicated with the pressure buffer tank and the electric control proportional valve, the electric control proportional valve is communicated with the pressure buffer tank, a first flowmeter is arranged on a pipeline between the electric control proportional valve and the pressure buffer tank, a testing mechanism is arranged on a pipeline between the injector and the electric control proportional valve and the pressure buffer tank, the pressure buffer tank is communicated with the second flowmeter, the second flowmeter is simultaneously communicated with the first electric control proportional valve and the second electric control proportional valve, and the first electric control proportional valve and the second electric control proportional valve are simultaneously communicated with the second electric control proportional valve;
the pressure buffer tank is provided with a deflation port, an input port and an exhaust port, the deflation port is communicated with the second flowmeter, the input port is communicated with the ejector, and the exhaust port is communicated with the first flowmeter;
the pressure buffer tank is also internally provided with a refrigerant coil, one end of the refrigerant coil is communicated with the temperature regulating device, and the other end of the refrigerant coil is communicated with the second electric control regulating valve;
the detection mechanism comprises a first pressure sensor, a first temperature sensor, a second pressure sensor, a third temperature sensor and a third pressure sensor, wherein the first pressure sensor and the first temperature sensor are sequentially arranged on a pipeline between the electric control stop valve and the ejector, the second pressure sensor and the temperature sensor are sequentially arranged on a pipeline between the electric control proportional valve and the ejector, and the third temperature sensor and the third pressure sensor are arranged on the pressure buffer tank.
2. A method for testing a pulse injector for a fuel cell, the method for testing a pulse injector for a fuel cell according to claim 1, comprising:
calibrating the flow of the injector, and marking the calibration process as S;
the injector flow calibration comprises:
s1, closing an electric control proportional valve and a second electric control regulating valve, wherein the first electric control proportional regulating valve and the second electric control proportional regulating valve are in a complete opening state;
s2 the injector is first set to a target frequency and a target pulse width, and the pressure reducing valve is adjusted so that the average value P of the pressure values displayed by the first pressure sensor average For the target pressure value P main ；
S3 as P average ＝P main When the temperature value output by the temperature regulating device is regulated to be higher than the target temperature value T main 0.5 ℃, wherein T main Is equal to the value displayed by the first temperature sensor, and simultaneously adjusts the opening of the first electric control adjusting valve, and the refrigerant flow flowing into the gas-liquid heat exchanger is adjusted through the opening of the first electric control adjusting valve until the value T displayed by the first temperature sensor 1302 ＝T main ；
S4 recording the flow value q in the second flowmeter main ；
S5, repeating the steps S2-S4 for different working condition ranges, and finally obtaining a flow MAP of the injector in the set temperature, frequency and pulse width ranges; different working conditions include: one working condition at every 5 ℃ in a preset temperature range, one working condition at every 5Hz in a preset frequency range and one working condition at every 2ms in a preset pulse width range;
calibrating the discharge flow rate of the pressure buffer tank, and marking the calibration process as SS;
the pressure buffer tank discharge flow calibration includes:
the SS1 takes down the ejector from the loop and directly communicates the electric control stop valve with the inlet of the ejector;
SS2 closes the electric control proportional valve, the first electric control proportional regulating valve and the second electric control proportional regulating valve, opens the electric control stop valve, and slowly opens the pressure reducing valve to enable the pressure value P shown by the third pressure sensor to be the same as the pressure value P shown by the third pressure sensor 1306 Rising to the target pressure P back_target Afterwards; maintaining the pressure regulating state of the pressure reducing valve clock at the target pressure;
the SS3 slowly opens the first electric control proportional regulating valve and records the opening-flow curve of the first electric control proportional regulating valve;
after the first electric control proportional regulating valve is fully opened, the SS4 is kept in a fully opened state, the second electric control proportional regulating valve is slowly opened, and an opening-flow curve of the second electric control proportional regulating valve is recorded;
SS5 closes the first and second electronically controlled proportional control valves;
SS6 repeats SS2-SS5 for each target pressure value, thereby obtaining opening-flow curve MAP MAPs at different pressures;
testing a pulse ejector; the test procedure is marked as SSS;
the pulse type ejector test comprises the following steps:
the SSS1 is arranged back to the ejector, so that the inlet end of the ejector is communicated with the electric control stop valve, and the outlet end of the ejector is communicated with the inlet of the ejector;
the SSS2 is used for closing the electric control proportional valve, the first electric control regulating valve and the second electric control regulating valve, and the first electric control proportional regulating valve and the second electric control proportional regulating valve are in a completely opened state;
SSS3 sets the injector at a set injection frequency f, pulse width τ, and interpolates from MAP_injector to obtain the actual injector flow q m_target ；
The temperature value output by the SSS4 regulating temperature regulating device is higher than the target temperature value T main The target temperature value is the value displayed by the first temperature sensor at 0.5 ℃, and simultaneously the opening degree of the first electric control regulating valve is regulated, so that the flow rate of the refrigerant flowing into the gas-liquid heat exchanger is regulated until the value T displayed by the first temperature regulating device 1302 ＝T main ；
SSS5 based on a given ejector target backpressure P back_target Target flow rate q m_target Interpolation is carried out on MAP_backstP_opening to obtain opening values of the first electric control proportional control valve and the second electric control proportional control valve;
SSS6 adjusts the electric control proportional valve to enable the pressure in the pressure buffer tank to be the pressure value P shown by the third pressure sensor 1306 With the pressure value P of the inlet of the ejector 1304 Pressure difference Δp=p of (a) 1306 -P 1304 Is a set pressure differential; the initial pressure value of the third pressure sensor is 1.2bar under the initial pressure state of the pressure buffer tank; 1.2bar to 3.5bar at 0.2bar intervals as a target pressure value
SSS7 adjusts the second electric control adjusting valve, increases the flow rate to enable the temperature in the pressure buffer tank to correspond to the target temperature, wherein the temperature in the pressure buffer tank is the temperature T displayed by the third temperature sensor 1305 ；
SSS8 pressure P in pressure buffer tank 1306 Variance value of (2)
Continuously less than the target variance value delta target At this time, recording of the second flowmeter (q 1403 ) And a first flowmeter 11 (q 11 ) In (1), wherein
Is the pressure P 1306 Transient average value of every 100 points:
i is the current counting point;
SSS9: injection ratio rr=q for this condition 11 /q 1403 。
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