Double-injection control method and device for hydrogen path of hydrogen fuel cell

Abstract

The invention provides a double-injection control method and device for a hydrogen path of a hydrogen fuel cell, the method is applied to a hydrogen supply circulation system in the hydrogen fuel cell, and the method comprises the following steps: obtaining target power received by the hydrogen supply circulation system, and a current 24V voltage signal and a current medium-voltage pressure signal in the hydrogen supply circulation system; determining a target in-pile pressure according to the target power; according to the 24V voltage signals and the medium-voltage pressure signals, target PI control parameters are determined, under the different 24V voltage signals and the medium-voltage pressure signals, the corresponding PI control parameters are determined through testing, and fluctuation of the corresponding proportional valves can be made to be minimum; and the target PI control parameters are adopted to adjust the opening degree of the target proportional valve, so that the actual in-pile pressure of the hydrogen supply circulating system reaches the target in-pile pressure. And in combination with a real-time 24V voltage signal and a real-time medium-voltage pressure signal, PI control parameters are determined, the opening degree of a proportional valve is adjusted, the fluctuation of the hydrogen in-pile pressure is reduced, and the stability and reliability of hydrogen supply are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of hydrogen fuel cells, and in particular to a method for controlling a hydrogen gas path dual injection of a hydrogen fuel cell, a device for controlling a hydrogen gas path dual injection of a hydrogen fuel cell, an electronic device, and a computer-readable storage medium. Background Art

[0002] A hydrogen fuel cell is a power generation device that converts chemical energy into electrical energy by performing a redox reaction between hydrogen and oxygen. A hydrogen fuel cell consists of six major parts: a fuel cell stack, a hydrogen supply circulation system, an air supply system, a water and heat management system, an electronic control system, and a data acquisition system. As an important component of a hydrogen fuel cell, the hydrogen supply circulation system is crucial to the reasonable design and control of the hydrogen supply circulation, which is crucial to improving the utilization rate of hydrogen and the operating life of the fuel cell stack and reducing the cost of hydrogen fuel cells.

[0003] At present, the hydrogen supply circulation system mainly adopts a dual ejector control scheme. Specifically, in the hydrogen supply circulation system, two ejectors of different calibers are configured, and a proportional valve is configured for each ejector. In the hydrogen supply cycle, after the vehicle control unit (VCU) generates the power demand, it sends the power demand to the electronic control system of the hydrogen fuel cell, that is, the fuel cell system control unit (Fuel-cell Control Unit, FCU). The FCU determines the target stack pressure based on the power demand, and then based on the preset proportional integral (Proportional Integral, PI) control parameters, by repeatedly adjusting the opening of the proportional valve, the actual stack pressure in the hydrogen supply circulation system gradually reaches the target stack pressure to meet the power demand of the VCU.

[0004] However, in the process of realizing the invention, the inventor found that a small-caliber ejector is used in low power demand, and a large-caliber ejector is used in high power demand. When the power demand is changed from low to high, or from high to low, it is necessary to switch the small-caliber ejector to a large-caliber ejector, or to switch the large-caliber ejector to a small-caliber ejector. At the moment when the large-caliber ejector starts working or quits working, the large-caliber ejector will produce a large hydrogen pressure shock. The hydrogen pressure shock reacts on the proportional valve, causing the proportional valve based on PI control to produce large fluctuations during repeated adjustments, thereby reducing the stability and reliability of the hydrogen supply. Summary of the invention

[0005] A technical problem to be solved by the present disclosure is to reduce fluctuations generated during the regulation of the proportional valve to improve the stability and reliability of hydrogen supply.

[0006] To solve the above technical problems, an embodiment of the present disclosure provides a hydrogen fuel cell hydrogen path dual-injection control method, the method is applied to a hydrogen supply circulation system in a hydrogen fuel cell, the hydrogen supply circulation system includes a first ejector and a first proportional valve corresponding thereto, and a second ejector and a second proportional valve corresponding thereto, the caliber of the second ejector is larger than that of the first ejector, the method includes: obtaining a target power received by the hydrogen supply circulation system, and a current 24V voltage signal and a medium pressure signal in the hydrogen supply circulation system; determining a target stack entry pressure according to the target power; determining a target PI control parameter according to the 24V voltage signal and the medium pressure signal, wherein different 24V voltage signals and medium pressure signals correspond to different PI control parameters, under different 24V voltage signals and medium pressure signals, the corresponding PI control parameters are determined by testing to adjust the corresponding proportional valve to the corresponding opening, so that the fluctuation of the corresponding proportional valve can be minimized; using the target PI control parameter, adjusting the opening of the target proportional valve, so that the actual stack entry pressure of the hydrogen supply circulation system reaches the target stack entry pressure, wherein the target proportional valve is the first proportional valve, or the first proportional valve and the second proportional valve.

[0007] In some embodiments, a target PI control parameter is determined based on a 24V voltage signal and a medium voltage pressure signal, including: querying PI control parameters corresponding to the 24V voltage signal and the medium voltage pressure signal from a pressure-voltage-PI control table, wherein a voltage difference between different 24V voltage signals in the pressure-voltage-PI control table is less than a preset voltage difference, and a pressure difference between different medium voltage pressure signals is less than a preset pressure difference, and the PI control parameters corresponding to each pair of 24V voltage signal and medium voltage pressure signal are PI control parameters with the smallest fluctuation in stack pressure when different PI control parameters are used in advance to adjust the proportional valve; and the queried PI control parameters are determined as target PI control parameters.

[0008] In some embodiments, querying PI control parameters corresponding to the 24V voltage signal and the medium voltage pressure signal from the pressure-voltage-PI control table includes: querying multiple first PI control parameters corresponding to the 24V voltage signal from the pressure-voltage-PI control table; determining whether the multiple first PI control parameters are the same; if so, taking the first PI control parameter as the queried PI control parameter; if not, dividing the multiple first PI control parameters into a second PI control parameter and a third PI control parameter, the second PI control parameter being different from the third PI control parameter, and the number of the second PI control parameters being less than the number of the third PI control parameters; determining whether the medium voltage pressure signal corresponding to the second PI control parameter in the pressure-voltage-PI control table is the same as the medium voltage pressure signal; if they are the same, taking the second PI control parameter as the queried PI control parameter; if they are different, taking the third PI control parameter as the queried PI control parameter.

[0009] In some embodiments, determining a target PI control parameter according to a 24V voltage signal and a medium voltage pressure signal includes: determining a fourth PI control parameter corresponding to the 24V voltage signal according to a voltage-PI control curve, wherein the voltage-PI control curve is obtained by fitting based on different 24V voltage signals and their corresponding PI control parameters, the voltage difference between different 24V voltage signals is greater than a preset voltage difference, and the PI control parameter corresponding to each 24V voltage signal is a PI control parameter with the smallest fluctuation of the stack pressure when different PI control parameters are used to adjust the proportional valve in advance; determining a fifth PI control parameter corresponding to the medium voltage pressure signal according to the pressure-PI control curve, wherein the pressure-PI control curve is obtained by fitting based on different medium voltage pressure signals and their corresponding PI control parameters, the pressure difference between different medium voltage pressure signals is greater than the preset pressure difference, and the PI control parameter corresponding to each medium voltage pressure signal is a PI control parameter with the smallest fluctuation of the stack pressure when different PI control parameters are used to adjust the proportional valve in advance; and performing weighted averaging of the fourth PI control parameter and the fifth PI control parameter to obtain the target PI control parameter.

[0010] In some embodiments, before using the target PI control parameters to adjust the opening of the target proportional valve, the method also includes: determining whether the target power is greater than a preset power, wherein the first proportional valve and the second proportional valve are adjusted simultaneously above the preset power to minimize the fluctuation of the stack pressure; if so, determining the first proportional valve and the second proportional valve as the target proportional valves; if not, determining the first proportional valve as the target proportional valve.

[0011] In some embodiments, before determining whether the target power is greater than the preset power, the method also includes: obtaining the previous power of the target power; determining whether the target power is greater than the previous power; determining whether the target power is greater than the preset power, including: if the target power is greater than the previous power, determining whether the target power is greater than a first preset power; if the target power is less than the previous power, determining whether the target power is greater than a second preset power, and the second preset power is less than the first preset power.

[0012] In some embodiments, the target proportional valve is a first proportional valve and a second proportional valve; the target PI control parameter is determined according to the 24V voltage signal and the medium voltage pressure signal, including: determining the first target PI control parameter for the first proportional valve according to the 24V voltage signal and the medium voltage pressure signal; determining the second target PI control parameter for the second proportional valve according to the 24V voltage signal and the medium voltage pressure signal, wherein the second target PI control parameter is different from the first target PI control parameter, and, under different 24V voltage signals and medium voltage pressure signals, the first proportional valve is adjusted to a corresponding opening by the first target PI control parameter, and the second proportional valve is adjusted to a corresponding opening by the second target PI control parameter, so that the stack pressure fluctuation can be minimized.

[0013] The disclosed embodiment also provides a hydrogen fuel cell hydrogen circuit dual-injection control device, which is applied to a hydrogen supply circulation system in a hydrogen fuel cell. The hydrogen supply circulation system includes a first ejector and a first proportional valve corresponding thereto, and a second ejector and a second proportional valve corresponding thereto. The second ejector has a larger caliber than the first ejector. The device includes: an acquisition module for acquiring a target power received by the hydrogen supply circulation system, and a current 24V voltage signal and a medium-pressure signal in the hydrogen supply circulation system; a first determination module for determining a target stacking pressure according to the target power; and a second determination module for determining a target stacking pressure according to the 24V The target PI control parameters are determined by using a voltage signal and a medium-voltage pressure signal, wherein different 24V voltage signals and medium-voltage pressure signals correspond to different PI control parameters. Under different 24V voltage signals and medium-voltage pressure signals, the corresponding PI control parameters are determined by testing to adjust the corresponding proportional valve to the corresponding opening, so that the fluctuation of the corresponding proportional valve can be minimized; a control module is used to use the target PI control parameters to adjust the opening of the target proportional valve so that the actual inlet pressure of the hydrogen supply circulation system reaches the target inlet pressure, wherein the target proportional valve is the first proportional valve, or the first proportional valve and the second proportional valve.

[0014] The disclosed embodiment also provides an electronic device, which includes: a processor, a memory, and a bus; wherein the processor and the memory communicate with each other via the bus; and the processor is used to call program instructions in the memory to execute a hydrogen fuel cell hydrogen path dual injection control method.

[0015] The embodiment of the present disclosure also provides a computer-readable storage medium, which includes: a stored program; wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute a hydrogen fuel cell hydrogen path double injection control method.

[0016] Through the above technical scheme, the hydrogen fuel cell hydrogen path double injection control method provided by the present invention, when determining the PI control parameters, takes into account the influencing factors of the 24V voltage signal and the medium pressure signal in the hydrogen supply circulation system, and combines the real-time 24V voltage signal and the medium pressure signal to determine the PI control parameters that minimize the proportional valve fluctuation in this proportional valve adjustment, so as to use the PI control parameters and adjust the opening of the proportional valve in combination with the target power to minimize the proportional valve fluctuation, thereby reducing the fluctuation of the hydrogen inlet pressure and improving the stability and reliability of the hydrogen supply.

[0017] The hydrogen fuel cell hydrogen path dual-injection control device, electronic device and computer-readable storage medium provided in the present disclosure have the same or similar beneficial effects as the hydrogen fuel cell hydrogen path dual-injection control method provided in the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of a pipeline instrumentation process (Process & Instrumentation Drawing, PID) of a hydrogen supply circulation system disclosed in an embodiment of the present disclosure;

[0020] Figure 2 is a schematic diagram of the control architecture of the hydrogen supply circulation system disclosed in the embodiment of the present disclosure;

[0021] Figure 3 The process diagram of the hydrogen fuel cell hydrogen path double injection control method disclosed in the embodiment of the present disclosure is as follows Figure 1 ;

[0022] Figure 4 The process diagram of the hydrogen fuel cell hydrogen path double injection control method disclosed in the embodiment of the present disclosure is as follows Figure 2 ;

[0023] Figure 5 The process diagram of the hydrogen fuel cell hydrogen path double injection control method disclosed in the embodiment of the present disclosure is as follows Figure 3 ;

[0024] Figure 6 The structure of the hydrogen fuel cell hydrogen gas path double injection control device disclosed in the embodiment of the present disclosure is schematically shown. Figure 1 ;

[0025] Figure 7 The structure of the hydrogen fuel cell hydrogen gas path double injection control device disclosed in the embodiment of the present disclosure is schematically shown. Figure 2 ;

[0026] Figure 8 Schematic diagram of the structure of an electronic device in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0028] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0029] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply 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 of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0031] It should also be noted that in the description of the present disclosure, 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0032] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0033] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0034] At present, in the hydrogen supply circulation system using dual ejectors with different calibers for control, when the power demand changes, switching between the two ejectors causes large fluctuations in the opening adjustment of the proportional valve corresponding to the ejector, thereby reducing the stability and reliability of the hydrogen supply.

[0035] In view of this, the embodiment of the present disclosure provides a hydrogen fuel cell hydrogen path dual-injection control method, a hydrogen fuel cell hydrogen path dual-injection control device, an electronic device and a computer-readable storage medium. When the opening of the proportional valve is adjusted based on power, the PI control parameter used no longer uses a fixed parameter, but is determined according to the 24V low-voltage power supply in the hydrogen supply circulation system and the current 24V voltage signal and medium-pressure signal of the medium-pressure pressure sensor. Since different PI control parameters are used under different 24V voltage signals and medium-pressure signals, the fluctuations generated in the corresponding proportional valve adjustment are all different. Therefore, when the proportional valve is adjusted, the PI control parameter corresponding to the minimum fluctuation when the proportional valve is adjusted is determined according to the current 24V voltage signal and medium-pressure signal, and then the PI control parameter is used, and the corresponding proportional valve is adjusted to the corresponding opening in combination with the target power, which can reduce the fluctuations generated when the proportional valve is adjusted due to power changes, thereby improving the stability and reliability of hydrogen supply.

[0036] First, the application scenario of the hydrogen fuel cell hydrogen path double injection control method provided by the embodiment of the present disclosure is described.

[0037] Figure 1 is a PID schematic diagram of the hydrogen supply circulation system disclosed in the embodiment of the present disclosure, see Figure 1 As shown, the hydrogen supply circulation system may include: a hydrogen bottle, a stop valve, a medium-pressure pressure sensor, a proportional valve 1 (i.e., a first proportional valve), a proportional valve 2 (i.e., a second proportional valve), a small ejector (i.e., a first ejector), a large ejector (i.e., a second ejector), an exhaust valve, a pressure relief valve, a stack pressure sensor, and a fuel cell stack.

[0038] The hydrogen supply circulation system also includes: FCU (not shown in the figure). FCU can collect various signals in the hydrogen circulation supply system, such as: medium pressure signal, stack pressure signal, 24V voltage signal, etc., and control the stop valve and proportional valve to supply hydrogen according to the collected signals.

[0039] Among them, the hydrogen bottle, as a hydrogen carrier, is used to provide the required hydrogen to the hydrogen supply circulation system.

[0040] The stop valve can control the flow of hydrogen between the hydrogen bottle and the proportional valve according to the instructions sent by the FCU.

[0041] The medium pressure sensor is used to collect the medium pressure signal at the rear end of the stop valve and feed the collected medium pressure signal back to the FCU.

[0042] Proportional valve 1 and proportional valve 2 can control the hydrogen flow rate to the small ejector and the large ejector according to the instructions sent by the FCU.

[0043] The small ejector and the large ejector are used for hydrogen reflux, wherein the caliber of the large ejector is larger than that of the small ejector.

[0044] The pressure relief valve releases pressure to protect the fuel cell stack when the hydrogen pressure exceeds the maximum pressure entering the stack.

[0045] The exhaust valve is used to exhaust other impurity gases in the hydrogen circuit according to the instructions sent by the FCU.

[0046] The stack pressure sensor is used to collect the hydrogen stack pressure signal and feed it back to the FCU.

[0047] The fuel cell stack is a carrier for the chemical reaction of hydrogen and oxygen.

[0048] In addition, the 24V low-voltage power supply can power the low-voltage components in the hydrogen supply circulation system and provide real-time 24V voltage signals to the FCU.

[0049] The VCU is used to send power-on commands, power-off commands or power requirements to the FCU.

[0050] Figure 2 is a schematic diagram of the control architecture of the hydrogen supply circulation system disclosed in the embodiment of the present disclosure, see Figure 2 As shown, the hydrogen supply circulation system may include: FCU, a stack pressure sensor, a medium pressure sensor, a proportional valve 1, a proportional valve 2 and a stop valve.

[0051] The VCU sends the power demand to the FCU. The FCU determines the hydrogen inlet pressure based on the power demand, and obtains the current 24V voltage signal and medium-pressure signal from the 24V low-voltage power supply and the medium-pressure pressure sensor, and then determines the PI control parameters with the smallest fluctuation of the regulating proportional valve. Then, based on the hydrogen inlet pressure, the determined PI control parameters are used to adjust the opening of proportional valve 1 and the proportional valve, that is, to control the duty cycle. Then, the inlet pressure signal is obtained in real time through the inlet pressure sensor. When the real-time obtained inlet pressure signal reaches the hydrogen inlet pressure requirement, the proportional valve adjustment is stopped to maintain the current hydrogen supply.

[0052] When it is necessary to stop the hydrogen supply, the VCU sends a shutdown command to the FCU, and the FCU sends a cut-off command to the cut-off valve to stop the hydrogen supply.

[0053] It should be noted here that the hydrogen supply circulation system is generally applied to hydrogen fuel cells, and hydrogen fuel cells are generally used to power vehicles, buildings, etc. Therefore, the hydrogen fuel cell hydrogen path dual injection control method provided in the embodiment of the present disclosure can be applied to the hydrogen fuel cell of the vehicle. Of course, in the case where the hydrogen supply circulation system is only used to quantitatively provide hydrogen, the hydrogen fuel cell hydrogen path dual injection control method provided in the embodiment of the present disclosure can also be applied to the quantitative supply of hydrogen.

[0054] The executor of the hydrogen fuel cell hydrogen path dual-injection control method provided in the embodiment of the present disclosure may be a FCU or other control devices in the hydrogen supply circulation system.

[0055] Next, the hydrogen fuel cell hydrogen path double injection control method provided by the embodiment of the present disclosure is described in detail.

[0056] Figure 3 The process diagram of the hydrogen fuel cell hydrogen path double injection control method disclosed in the embodiment of the present disclosure is as follows Figure 1 , see Figure 3 As shown, the method may include:

[0057] S31: Acquire the target power received by the hydrogen supply circulation system, and the current 24V voltage signal and medium voltage pressure signal in the hydrogen supply circulation system.

[0058] When the vehicle needs to be powered by a hydrogen fuel cell, the VCU in the vehicle will generate a power demand, i.e., the target power, and then send the target power to the FCU, so that the FCU can control the hydrogen supply circulation system to deliver the corresponding flow of hydrogen into the fuel cell stack, and then use the electrical energy generated by the chemical reaction between hydrogen and oxygen in the fuel cell stack to power the vehicle.

[0059] The target power here is the power that the vehicle currently needs to provide from the hydrogen fuel cell, for example: 50kw, etc., which needs to be determined based on the actual power consumption needs of the vehicle.

[0060] After the FCU receives the target power, it can determine that hydrogen quantitative supply is required. The quantitative supply of hydrogen depends on the opening control of the proportional valve. In order to reduce the fluctuation of the proportional valve, the selection of PI control parameters is particularly critical. In the disclosed embodiment, the determination of the PI control parameters needs to refer to the current 24V voltage signal and medium pressure signal of the hydrogen supply circulation system. Therefore, after receiving the target power, it is necessary to obtain the current 24V voltage signal and medium pressure signal in the hydrogen supply circulation system.

[0061] Although a 24V low-voltage power supply can provide a 24V voltage signal, it does not necessarily provide a 24V voltage signal accurately. For example, the voltage signal provided at a certain moment is 24V, but due to voltage fluctuations, the voltage signal provided at the next moment may be 23V or 25V. Therefore, the 24V voltage signal here does not only refer to 24V, but refers to the actual voltage signal currently provided by the 24V low-voltage power supply.

[0062] The medium pressure signal can be obtained from the medium pressure sensor of the hydrogen supply circulation system.

[0063] S32: Determine the target stacking pressure according to the target power.

[0064] The target power can be used to determine the final pressure of hydrogen flowing into the fuel cell stack, i.e., the target stack pressure. Then, the opening of the corresponding proportional valve can be adjusted according to the PI control parameter until the actual stack pressure in the hydrogen supply circulation system reaches the target stack pressure (either the actual stack pressure is equal to the target stack pressure, or there is an allowable error between the actual stack pressure and the target stack pressure).

[0065] Determining the target stack entry pressure based on the target power is the same as the method of determining the stack entry pressure based on power in the existing hydrogen supply circulation system, which will not be repeated here.

[0066] S33: Determine the target PI control parameters according to the 24V voltage signal and the medium voltage pressure signal, wherein different 24V voltage signals and medium voltage pressure signals correspond to different PI control parameters. Under different 24V voltage signals and medium voltage pressure signals, the corresponding PI control parameters are determined by testing to adjust the corresponding proportional valve to the corresponding opening, so as to minimize the fluctuation of the corresponding proportional valve.

[0067] In the disclosed embodiment, the PI control parameters are not fixed, but vary according to the 24V voltage signal and the medium pressure signal, in order to ensure that the corresponding proportional valve has the smallest fluctuation during the adjustment process. Therefore, each 24V voltage signal and the medium pressure signal and their corresponding PI control parameters need to be obtained by placing the hydrogen supply circulation system on a bench for calibration in advance.

[0068] During calibration, different 24V voltage signals and medium pressure signals can be provided for the hydrogen supply circulation system. For each set of 24V voltage signals and medium pressure signals, different PI control parameters are used to adjust the proportional valve. Then, according to the fluctuation effect of the proportional valve, the corresponding PI control parameters when the fluctuation is the smallest are selected. In this way, different 24V voltage signals and medium pressure signals and their corresponding PI control parameters are obtained.

[0069] Between different groups of 24V voltage signals and medium voltage pressure signals, one of the 24V voltage signals and medium voltage pressure signals can be the same. That is to say, between different groups of 24V voltage signals and medium voltage pressure signals, only changing the specific value of one of the signals can get a new combination of 24V voltage signal and medium voltage pressure signal. For example: 24V voltage signal 1-medium voltage pressure signal 1-PI control parameter 1, 24V voltage signal 2-medium voltage pressure signal 1-PI control parameter 2, 24V voltage signal 1-medium voltage pressure signal 2-PI control parameter 3, 24V voltage signal 2-medium voltage pressure signal 2-PI control parameter 4.

[0070] In the process of using different PI control parameters to adjust the proportional valve for each set of 24V voltage signal and medium pressure signal, it can be done at one power or at multiple powers. When it is done at multiple powers, different PI control parameters need to be used to adjust the proportional valve for each power, so as to obtain different powers and their corresponding PI control parameters. In the end, what is obtained is: different 24V voltage signals and medium pressure signals and their corresponding PI control parameters at different powers. In this way, the PI control parameters can be determined more accurately, the fluctuation of the proportional valve can be further reduced, and the stability and reliability of the hydrogen supply can be improved.

[0071] After obtaining the current 24V voltage signal and medium voltage pressure signal, the same or similar 24V voltage signal and medium voltage pressure signal can be determined based on the previous calibration results, and then the target PI control parameters used this time can be determined.

[0072] It should be noted that the above steps S32 and S33 can be performed simultaneously to improve the double injection control efficiency of the hydrogen fuel cell hydrogen path. Of course, the above steps S32 and S33 can also be performed asynchronously to reduce the energy consumption of the hydrogen supply circulation system per unit time.

[0073] S34: using the target PI control parameter to adjust the opening of the target proportional valve so that the actual inlet pressure of the hydrogen supply circulation system reaches the target inlet pressure, wherein the target proportional valve is the first proportional valve, or the first proportional valve and the second proportional valve.

[0074] The target loading pressure is determined by the target power, and the target PI control parameters are determined by the current 24V voltage signal and the medium voltage signal. Next, the target PI control parameters can be used to gradually adjust the opening of the target proportional valve when the proportional valve produces the smallest fluctuation. The target proportional valve cannot be adjusted in one go, but is adjusted repeatedly. While adjusting the opening of the target proportional valve, the actual loading pressure is monitored. When the actual loading pressure is equal to or close to the target loading pressure within the error range, it means that the hydrogen supply has met the requirements. At this time, the target proportional valve adjustment can be stopped to maintain the current hydrogen supply until the next power change, and the target loading pressure and PI control parameters are determined again, and then the target proportional valve is adjusted again.

[0075] The target proportional valve to be adjusted can be the first proportional valve or the first proportional valve and the second proportional valve, which can be comprehensively determined based on the specific calibers of the first ejector and the second ejector, as well as the power demand and the principle of minimum fluctuation. For different power requirements, as long as the fluctuation caused by the proportional valve adjustment is minimal, it does not matter whether the first ejector or the first ejector and the second ejector are used. For example: if the target power is 20kw, the first ejector is used, that is, the first proportional valve is adjusted and the second proportional valve is closed. For another example: if the target power is 60kw, the first ejector and the second ejector are used, that is, the first proportional valve and the second proportional valve are adjusted at the same time.

[0076] The first proportional valve and the second proportional valve here are only used to distinguish different connected ejectors, and can actually be proportional valves of the same model or different models.

[0077] From the above content, it can be seen that the hydrogen fuel cell hydrogen path dual injection control method provided by the embodiment of the present disclosure, when determining the PI control parameters, takes into account the influencing factors of the 24V voltage signal and the medium pressure signal in the hydrogen supply circulation system, and combines the real-time 24V voltage signal and the medium pressure signal to determine the PI control parameters that minimize the proportional valve fluctuation in this proportional valve adjustment, so as to use the PI control parameters and adjust the opening of the proportional valve in combination with the target power to minimize the proportional valve fluctuation, thereby reducing the fluctuation of the hydrogen inlet pressure and improving the stability and reliability of the hydrogen supply.

[0078] As a pair Figure 3 As a refinement and extension of the method shown, the disclosed embodiment also provides a method for controlling double injection of hydrogen in a hydrogen fuel cell hydrogen path.

[0079] Figure 4 The process diagram of the hydrogen fuel cell hydrogen path double injection control method disclosed in the embodiment of the present disclosure is as follows Figure 2 , see Figure 4 As shown, the method may include:

[0080] S41: Acquire the target power received by the hydrogen supply circulation system, and the current 24V voltage signal and medium voltage pressure signal in the hydrogen supply circulation system.

[0081] S42: Determine the target stacking pressure according to the target power.

[0082] The specific implementation of steps S41 and S42 here is the same as that of steps S31 and S32 in the aforementioned embodiment, and will not be repeated here.

[0083] S43: Determine whether the target power is greater than the preset power, wherein the first proportional valve and the second proportional valve are adjusted simultaneously above the preset power to minimize the fluctuation of the stack pressure. If yes, execute step S44, if not, execute step S45.

[0084] S44: Determine the first proportional valve and the second proportional valve as target proportional valves.

[0085] S45: Determine the first proportional valve as the target proportional valve.

[0086] After obtaining the target power, in addition to determining the target stack pressure for hydrogen supply control, the proportional valve to be used can also be determined to reduce the impact caused by starting or stopping the large ejector.

[0087] If the target power is greater than the preset power, it means that the hydrogen supply flow is large, and the first proportional valve and the first ejector cannot meet it. It is necessary to use the first proportional valve and the second large-caliber ejector. If only the second ejector is used, the sudden activation of the ejector will cause an increase in impact, which will cause a large fluctuation in the regulation of the second proportional valve. At this time, the first ejector and the second ejector are used at the same time, that is, the first proportional valve and the second proportional valve are used for control at the same time, so that the first ejector shares part of the hydrogen flow for the second ejector. In this way, when the second ejector is activated, the hydrogen flow passing through will be reduced, thereby reducing the impact, and then reducing the impact on the regulation of the proportional valve, making the proportional valve more stable in the opening adjustment, and further improving the stability of the hydrogen supply.

[0088] The hydrogen flow rate that the first ejector and the second ejector need to share can be the remaining hydrogen flow rate allocated to the second ejector after the first ejector is saturated. It can also be allocated according to a certain ratio, which is not limited here.

[0089] If the target power is less than or equal to the preset power, it means that the hydrogen supply flow rate is small, and the first proportional valve and the first ejector can meet the requirement. At this time, only the first ejector is used, that is, only the first proportional valve is used for control, and the second ejector is not started, and no impact will be generated. However, the hydrogen flow rate passing through the first ejector is small, the impact is not strong, and the impact on the proportional valve regulation is small. If you want to further reduce the proportional valve fluctuation, you can also enable the first ejector and the second ejector at the same time. At this time, the hydrogen flow rate allocated to the second ejector can be less than the first ejector, so that the second ejector with a large diameter outputting high-speed hydrogen will not produce too much impact, and can be equivalent to the hydrogen impact output by the first ejector, further splitting the low-flow hydrogen, further reducing the impact of hydrogen impact on the proportional valve regulation, and improving the stability of hydrogen supply.

[0090] The preset power here can be set according to historical experience, or it can be obtained by enabling one or two proportional valves for testing at different powers. For example: at power 1, the fluctuation is minimized when the first proportional valve is started, and at power 2, the fluctuation is minimized when the first proportional valve and the second proportional valve are started. At this time, the preset power can be determined as a value between power 1 and power 2, or the power value can be continuously selected for testing in power 1 and power 2 until the power value corresponding to the minimum fluctuation when the first proportional valve and the second proportional valve are used is found. The specific value of the preset power is not limited here.

[0091] By comparing the target power with the preset power, the target proportional valve for this control is selected. Once the target proportional valve is determined, the proportional valve adjustment can be started at the same time in the first time. Compared with the sequential activation adjustment of the proportional valve, the adjustment efficiency of the proportional valve can be improved, thereby improving the hydrogen supply efficiency.

[0092] In the actual process of adjusting the proportional valve, sometimes, the opening of the proportional valve is adjusted from small to large. Selecting the target proportional valve according to the preset power can minimize the fluctuation. When the opening of the proportional valve is adjusted from large to small, when the power is less than the preset power, the first ejector and its corresponding first proportional valve are used for hydrogen control, and the fluctuation generated will be greater than the use of the first ejector and the second ejector at the same time. Therefore, when determining the target proportional valve, the change in hydrogen flow demand also needs to be considered.

[0093] Specifically, before the above step S43, the method may further include:

[0094] Step A1: Obtain the previous power of the target power.

[0095] Step A2: Determine whether the target power is greater than the previous power.

[0096] The above step S43 may include:

[0097] Step A3: If the target power is greater than the previous power, determine whether the target power is greater than the first preset power.

[0098] Step A4: If the target power is less than the previous power, determine whether the target power is greater than a second preset power, and the second preset power is less than the first preset power.

[0099] The previous power here refers to the power demand received by the hydrogen supply circulation system before it received the target power. Generally speaking, if the vehicle power demand remains unchanged, the vehicle will not send a power demand to the hydrogen supply circulation system. Only when the vehicle power demand changes will the vehicle send a power demand to the hydrogen supply circulation system. Therefore, the previous power is different from the target power.

[0100] If the target power is greater than the previous power, it means that the vehicle's demand for power has increased and the opening of the proportional valve needs to be increased. At this time, the target power is compared with the larger first preset power to determine the proportional valve to be used this time.

[0101] If the target power is less than the previous power, it means that the vehicle's demand for power has decreased and the opening of the proportional valve needs to be reduced. At this time, the target power is compared with the smaller second preset power to determine the proportional valve to be used this time.

[0102] At this point, all determinations based on the target power (i.e., determination of the target stacking pressure and the target proportional valve) have been completed. Next, the corresponding PI control parameters are determined based on the current 24V voltage signal and the medium voltage pressure signal.

[0103] That is to say, the proportional valve is opened at a high power point and closed at a low power point. That is, the hysteresis strategy is adopted to improve the accuracy of the proportional valve and reduce fluctuations.

[0104] S46: Query the PI control parameters corresponding to the 24V voltage signal and the medium voltage pressure signal from the pressure-voltage-PI control table, wherein the voltage difference between different 24V voltage signals in the pressure-voltage-PI control table is less than the preset voltage difference, and the pressure difference between different medium voltage pressure signals is less than the preset pressure difference. The PI control parameters corresponding to each pair of 24V voltage signal and medium voltage pressure signal are the PI control parameters with the smallest fluctuation of the stack pressure when the proportional valve is adjusted in advance using different PI control parameters.

[0105] In the pressure-voltage-PI control table, different 24V voltage signals and medium pressure signals and their corresponding PI control parameters are stored. Under each pair of 24V voltage signal and medium pressure signal, the corresponding PI control parameters are selected from multiple PI control parameters after testing. That is, each PI control parameter is used to adjust the opening of the corresponding proportional valve based on power, and the corresponding PI control parameter when the proportional valve fluctuation is minimized is selected.

[0106] The PI control parameters are queried in the pressure-voltage-PI control table. Since the PI control parameters in the table are obtained through test calibration, it can ensure that the fluctuation is minimal when the proportional valve is adjusted, further improving the stability and reliability of the hydrogen supply.

[0107] The PI control parameters include: proportional gain (Kp) and integral gain (Ki). Among different PI control parameters, at least one of the proportional gain (Kp) and the integral gain (Ki) may be different. Among different PI control parameters, only the proportional gain (Kp) or the integral gain (Ki) is different, which can realize the refined test of the PI control parameters, ensure that the PI control parameters in the table have the smallest fluctuation caused by the proportional valve adjustment under the corresponding 24V voltage signal and medium voltage pressure signal, and further realize the accurate determination of the PI control parameters.

[0108] The difference between each group of 24V voltage signals and medium pressure signals, the difference between 24V voltage signals, and the difference between medium pressure signals need to be smaller than the preset voltage difference and the preset pressure difference, that is, the smaller the change between each group of 24V voltage signals and medium pressure signals in the test, the better. In this way, it can fully correspond to the actual situation of the hydrogen supply circulation system, ensure that the PI control parameters found can minimize the fluctuation when the proportional valve is adjusted, and further realize the accurate determination of the PI control parameters.

[0109] Since there are many specific values ​​of 24V voltage signal and medium voltage pressure signal, and the number of different combinations of 24V voltage signal and medium voltage pressure signal is even greater, there are many entries of 24V voltage signal-medium voltage pressure signal-PI control parameters in the pressure-voltage-PI control table. In order to improve the search efficiency of PI control parameters, you can first search for a certain signal, and then directly determine the PI control parameters based on the search results, or determine the PI control parameters based on another signal.

[0110] Specifically, the above step S46 may include:

[0111] Step B1: Query multiple first PI control parameters corresponding to the 24V voltage signal from the pressure-voltage-PI control table.

[0112] Step B2: Determine whether the multiple first PI control parameters are the same. If yes, execute step B3; if no, execute step B4.

[0113] Step B3: taking the first PI control parameter as the queried PI control parameter.

[0114] Sometimes, in the pressure-voltage-PI control table, the PI control parameters corresponding to the same 24V voltage signal or medium voltage pressure signal are the same. Therefore, the PI control parameters can be locked through the 24V voltage signal or the medium voltage pressure signal without the need to match based on another medium voltage pressure signal or 24V voltage signal, thereby improving the search efficiency of the PI control parameters.

[0115] For example, assuming that in the pressure-voltage-PI control table, 24V voltage signal 1-medium voltage pressure signal 1-PI control parameter 1, 24V voltage signal 2-medium voltage pressure signal 1-PI control parameter 1, 24V voltage signal 3-medium voltage pressure signal 1-PI control parameter 1, 24V voltage signal 1-medium voltage pressure signal 2-PI control parameter 2. At this time, 24V voltage signal 1 and medium voltage pressure signal 1 are obtained, and based on medium voltage pressure signal 1, only PI control parameter 1 is found in the table. It is no longer necessary to match in the table based on 24V voltage signal 1, and it can be determined that PI control parameter 1 is found.

[0116] Step B4: divide the plurality of first PI control parameters into second PI control parameters and third PI control parameters, wherein the second PI control parameters are different from the third PI control parameters, and the number of the second PI control parameters is less than the number of the third PI control parameters.

[0117] Step B5: Determine whether the medium pressure signal corresponding to the second PI control parameter in the pressure-voltage-PI control table is the same as the medium pressure signal. If yes, execute step B6; if no, execute step B7.

[0118] Step B6: using the second PI control parameter as the queried PI control parameter;

[0119] Step B7: taking the third PI control parameter as the queried PI control parameter.

[0120] If the multiple first PI control parameters found based on a certain signal are different, then the least number of different PI control parameters can be found among the multiple first PI control parameters, and then another signal can be matched with another signal corresponding to these PI control parameters. In this way, the number of matches can be reduced and the efficiency of finding PI control parameters can be improved.

[0121] For example, assume that the pressure-voltage-PI control table includes:

[0122] 24V voltage signal 1-medium voltage pressure signal 1-PI control parameter 1;

[0123] 24V voltage signal 2-medium voltage pressure signal 1-PI control parameter 1;

[0124] 24V voltage signal 3-medium voltage pressure signal 1-PI control parameter 2;

[0125] 24V voltage signal 1-medium voltage pressure signal 2-PI control parameter 2;

[0126] 24V voltage signal 1-medium voltage pressure signal 3-PI control parameter 2.

[0127] At this time, the 24V voltage signal 3 and the medium voltage pressure signal 1 are obtained, and based on the medium voltage pressure signal 1, the PI control parameter 1, PI control parameter 1 and PI control parameter 2 are found in the table. The PI control parameter 2 corresponds to the 24V voltage signal 3 in the table, which is exactly the obtained 24V voltage signal 3, and the PI control parameter 2 can be locked.

[0128] If the PI control parameter 2 does not correspond to the 24V voltage signal 3 in the table, then the PI control parameter 1 is locked.

[0129] The second PI control parameter and the third PI control parameter above are only used to illustrate how to lock the final PI control parameter when the multiple first PI control parameters are different. If the multiple first PI control parameters are not two, but three or more, the matching of another signal can also be performed starting from the first PI control parameter with the least number in the above manner until the first PI control parameter with the most number is matched. In this way, the number of matches of another signal in the table can be minimized, and the search efficiency of the PI control parameter can be improved.

[0130] S47: Determine the queried PI control parameter as the target PI control parameter.

[0131] In addition to querying the target PI control parameters through the pressure-voltage-PI control table, the target PI control parameters can also be determined based on the voltage-PI control curve and the pressure-PI control curve.

[0132] Specifically, in addition to the above steps S46-S47, the method may further include:

[0133] Step C1: determining a fourth PI control parameter corresponding to the 24V voltage signal according to the voltage-PI control curve, wherein the voltage-PI control curve is obtained by fitting based on different 24V voltage signals and their corresponding PI control parameters, the voltage difference between different 24V voltage signals is greater than a preset voltage difference, and the PI control parameter corresponding to each 24V voltage signal is a PI control parameter with the smallest fluctuation in the stack pressure when the proportional valve is adjusted in advance using different PI control parameters.

[0134] Step C2: determining a fifth PI control parameter corresponding to the medium pressure signal according to the pressure-PI control curve, wherein the pressure-PI control curve is obtained by fitting based on different medium pressure signals and their corresponding PI control parameters, the pressure difference between different medium pressure signals is greater than a preset pressure difference, and the PI control parameter corresponding to each medium pressure signal is a PI control parameter with the smallest fluctuation of the stack pressure when the proportional valve is adjusted in advance using different PI control parameters.

[0135] That is to say, different PI control parameters are still used for testing based on different 24V voltage signals and medium pressure signals in advance, and the PI control parameters with the smallest proportional valve fluctuation are selected. However, compared with establishing a pressure-voltage-PI control table, the signal interval between different 24V voltage signals and medium pressure signals can be appropriately enlarged. In this way, the workload of testers can be reduced.

[0136] Then, for different 24V voltage signals and their corresponding PI control parameters, the voltage-PI control curve is fitted, and for different medium-pressure signals and their corresponding PI control parameters, the pressure-PI control curve is fitted. In this way, even if the 24V voltage signal and medium-pressure signal are not involved in the test, the fitted curve can also cover it. No matter what the current values ​​of the 24V voltage signal and the medium-pressure signal in the hydrogen supply circulation system are, they can be found in the corresponding curve, and then the PI control parameters can be accurately locked without increasing the test workload.

[0137] It should be noted here that the above step C1 and step C2 can be performed simultaneously to improve the efficiency of determining the target PI control parameters.

[0138] Step C3: Perform weighted averaging on the fourth PI control parameter and the fifth PI control parameter to obtain a target PI control parameter.

[0139] Sometimes, the fourth PI control parameter determined from the voltage-PI control curve based on the current 24V voltage signal is the same as the fifth PI control parameter determined from the pressure-PI control curve based on the current medium voltage pressure signal. At this time, the fourth PI control parameter or the fifth PI control parameter can be directly used as the target PI control parameter to improve the efficiency of determining the PI control parameter.

[0140] Sometimes, the fourth PI control parameter determined from the voltage-PI control curve based on the current 24V voltage signal is different from the fifth PI control parameter determined from the pressure-PI control curve based on the current medium voltage pressure signal. In this case, the fourth PI control parameter and the fifth PI control parameter can be weighted averaged to obtain the target PI control parameter. The weights of the fourth PI control parameter and the fifth PI control parameter can be determined according to the specific situation of the 24V voltage signal-medium voltage pressure signal-PI control parameter in the test to improve the accuracy of the PI control parameter determination.

[0141] In order to further improve the accuracy of determining the PI control parameters, when the first proportional valve and the second proportional valve are used for simultaneous control, the PI control parameters may be determined for the first proportional valve and the second proportional valve, respectively.

[0142] Specifically, the method may further include:

[0143] Step D1: Determine a first target PI control parameter for a first proportional valve according to the 24V voltage signal and the medium voltage pressure signal.

[0144] Step D2: Determine a second target PI control parameter for the second proportional valve based on the 24V voltage signal and the medium voltage pressure signal, wherein the second target PI control parameter is different from the first target PI control parameter, and, under different 24V voltage signals and medium voltage pressure signals, adjust the first proportional valve to a corresponding opening by the first target PI control parameter, and adjust the second proportional valve to a corresponding opening by the second target PI control parameter, so as to minimize the fluctuation of the stack pressure.

[0145] That is to say, in the preliminary test, for the same group of 24V voltage signal and medium pressure signal, in multiple tests, each test uses one PI control parameter for the first proportional valve and another PI control parameter for the second proportional valve. Then check the fluctuation results of each test and select the PI control parameter combination with the smallest fluctuation. Each group of 24V voltage signal and medium pressure signal is carried out in the above manner. In this way, different 24V voltage signals and medium pressure signals and their corresponding first target PI control parameters of the first proportional valve and the second target PI control parameters of the second proportional valve are obtained. The precise adjustment of the first proportional valve and the second proportional valve is achieved, and the fluctuation is further reduced.

[0146] S48: Using the target PI control parameter, adjusting the opening of the target proportional valve so that the actual inlet pressure of the hydrogen supply circulation system reaches the target inlet pressure, wherein the target proportional valve is the first proportional valve, or the first proportional valve and the second proportional valve.

[0147] The specific implementation method of step S48 here is the same as that of step S34 in the aforementioned embodiment, and will not be repeated here.

[0148] Finally, the hydrogen fuel cell hydrogen path double injection control method provided by the present invention is clearly explained again with a complete and specific embodiment.

[0149] Figure 5 The process diagram of the hydrogen fuel cell hydrogen path double injection control method disclosed in the embodiment of the present disclosure is as follows Figure 3 , see Figure 5 As shown, the method may include:

[0150] S51: The hydrogen supply circulation system is powered on.

[0151] S52: The VCU sends a power-on command to the FCU.

[0152] S53: FCU controls the stop valve to open.

[0153] S54: The FCU collects the current medium voltage signal, 24V voltage signal and stacking pressure signal.

[0154] S55: Determine whether the VCU requested power is less than 50 kW. If so, proceed to S56; if not, proceed to S57.

[0155] S56: FCU queries the pressure-voltage-PI control table based on the medium pressure signal and the 24V voltage signal to control the closed-loop operation of proportional valve 1.

[0156] S57: FCU queries the pressure-voltage-PI control table according to the medium pressure signal and the 24V voltage signal, and controls proportional valve 1 and proportional valve 2 to work in closed loop at the same time.

[0157] S58: Determine whether the target stacking pressure minus the actual stacking pressure is less than 3 kP. If so, proceed to S59; if not, proceed to S55.

[0158] S59: FCU controls the hydrogen supply circulation system to maintain the current state of operation.

[0159] S510: Determine whether the VCU requested power is less than 45 kW. If yes, proceed to S511; if no, proceed to S512.

[0160] S511: The FCU queries the pressure-voltage-PI control table based on the medium pressure signal and the 24V voltage signal to control the closed-loop operation of proportional valve 1.

[0161] S512: The FCU queries the pressure-voltage-PI control table according to the medium voltage signal and the 24V voltage signal, and controls proportional valve 1 and proportional valve 2 to operate in closed loop at the same time.

[0162] S513: Determine whether the target stacking pressure minus the actual stacking pressure is less than 3 kP. If so, proceed to S514; if not, proceed to S510.

[0163] S514: FCU controls the hydrogen supply circulation system to maintain the current operation state.

[0164] S515: FCU determines whether a shutdown command is received. If yes, the process proceeds to S516; if no, the process proceeds to S55.

[0165] S516: The hydrogen supply circulation system is shut down, and the FCU closes the stop valve, proportional valve 1 and proportional valve 2.

[0166] So far, the hydrogen fuel cell hydrogen path dual injection control method provided by the embodiment of the present disclosure has been fully described.

[0167] Based on the same inventive concept, as an implementation of the above method, the disclosed embodiment also provides a hydrogen fuel cell hydrogen path double injection control device.

[0168] The double-injection control device of the hydrogen gas circuit of a hydrogen fuel cell is applied to the hydrogen supply circulation system in the hydrogen fuel cell. The hydrogen supply circulation system includes a first ejector and its corresponding first proportional valve and a second ejector and its corresponding second proportional valve. The caliber of the second ejector is larger than that of the first ejector.

[0169] Figure 6 The structure of the hydrogen fuel cell hydrogen gas path double injection control device disclosed in the embodiment of the present disclosure is schematically shown. Figure 1 , see Figure 6 As shown, the device may include:

[0170] An acquisition module 61 is used to acquire the target power received by the hydrogen supply circulation system, and the current 24V voltage signal and medium voltage pressure signal in the hydrogen supply circulation system;

[0171] A first determination module 62, configured to determine a target stack entry pressure according to a target power;

[0172] The second determination module 63 is used to determine the target PI control parameter according to the 24V voltage signal and the medium voltage pressure signal, wherein different 24V voltage signals and medium voltage pressure signals correspond to different PI control parameters. Under different 24V voltage signals and medium voltage pressure signals, the corresponding PI control parameter is determined by testing to adjust the corresponding proportional valve to the corresponding opening, so that the fluctuation of the corresponding proportional valve can be minimized;

[0173] The control module 64 is used to use the target PI control parameter to adjust the opening of the target proportional valve so that the actual inlet pressure of the hydrogen supply circulation system reaches the target inlet pressure, wherein the target proportional valve is the first proportional valve, or the first proportional valve and the second proportional valve.

[0174] As a pair Figure 6 As a refinement and expansion of the device shown, the disclosed embodiment also provides a hydrogen fuel cell hydrogen path dual injection control device.

[0175] Figure 7 The structure of the hydrogen fuel cell hydrogen gas path double injection control device disclosed in the embodiment of the present disclosure is schematically shown. Figure 2 , see Figure 7 As shown, the device may include:

[0176] An acquisition module 71 is used to acquire the target power received by the hydrogen supply circulation system, and the current 24V voltage signal and medium voltage pressure signal in the hydrogen supply circulation system;

[0177] A stack entry pressure determination module 72, used to determine a target stack entry pressure according to a target power;

[0178] The proportional valve determination module 73 is used to determine whether the target power is greater than the preset power, wherein the first proportional valve and the second proportional valve are adjusted simultaneously above the preset power, and the fluctuation of the stack pressure is minimized; if so, the first proportional valve and the second proportional valve are determined as the target proportional valves; if not, the first proportional valve is determined as the target proportional valve;

[0179] In the proportional valve determination module 73, before determining whether the target power is greater than the preset power, the method also includes: obtaining the previous power of the target power; determining whether the target power is greater than the previous power; determining whether the target power is greater than the preset power, including: if the target power is greater than the previous power, determining whether the target power is greater than the first preset power; if the target power is less than the previous power, determining whether the target power is greater than the second preset power, and the second preset power is less than the first preset power.

[0180] The PI control determination module 74 is used to query the PI control parameters corresponding to the 24V voltage signal and the medium voltage pressure signal from the pressure-voltage-PI control table, wherein the voltage difference between different 24V voltage signals in the pressure-voltage-PI control table is less than the preset voltage difference, and the pressure difference between different medium voltage pressure signals is less than the preset pressure difference. The PI control parameters corresponding to each pair of 24V voltage signal and medium voltage pressure signal are the PI control parameters with the smallest fluctuation of the stack pressure when the proportional valve is adjusted by using different PI control parameters in advance; the queried PI control parameters are determined as the target PI control parameters;

[0181] In the PI control determination module 74, the PI control parameters corresponding to the 24V voltage signal and the medium voltage pressure signal are queried from the pressure-voltage-PI control table, including: querying multiple first PI control parameters corresponding to the 24V voltage signal from the pressure-voltage-PI control table; judging whether the multiple first PI control parameters are the same; if so, taking the first PI control parameter as the queried PI control parameter; if not, dividing the multiple first PI control parameters into a second PI control parameter and a third PI control parameter, the second PI control parameter is different from the third PI control parameter, and the number of the second PI control parameters is less than the number of the third PI control parameters; judging whether the medium voltage pressure signal corresponding to the second PI control parameter in the pressure-voltage-PI control table is the same as the medium voltage pressure signal; if they are the same, taking the second PI control parameter as the queried PI control parameter; if they are different, taking the third PI control parameter as the queried PI control parameter.

[0182] The PI control determination module 74 is further used to determine a fourth PI control parameter corresponding to the 24V voltage signal according to the voltage-PI control curve, wherein the voltage-PI control curve is obtained by fitting based on different 24V voltage signals and their corresponding PI control parameters, the voltage difference between different 24V voltage signals is greater than the preset voltage difference, and the PI control parameter corresponding to each 24V voltage signal is a PI control parameter with the smallest fluctuation of the stack pressure when the proportional valve is adjusted by different PI control parameters in advance; determine a fifth PI control parameter corresponding to the medium pressure signal according to the pressure-PI control curve, wherein the pressure-PI control curve is obtained by fitting based on different medium pressure signals and their corresponding PI control parameters, the pressure difference between different medium pressure signals is greater than the preset pressure difference, and the PI control parameter corresponding to each medium pressure signal is a PI control parameter with the smallest fluctuation of the stack pressure when the proportional valve is adjusted by different PI control parameters in advance; and perform weighted averaging on the fourth PI control parameter and the fifth PI control parameter to obtain a target PI control parameter;

[0183] When the target proportional valve is the first proportional valve and the second proportional valve, the PI control determination module 74 is further used to determine a first target PI control parameter for the first proportional valve according to the 24V voltage signal and the medium pressure signal; determine a second target PI control parameter for the second proportional valve according to the 24V voltage signal and the medium pressure signal, wherein the second target PI control parameter is different from the first target PI control parameter, and under different 24V voltage signals and medium pressure signals, the first proportional valve is adjusted to a corresponding opening by the first target PI control parameter, and the second proportional valve is adjusted to a corresponding opening by the second target PI control parameter, so that the fluctuation of the stack pressure can be minimized;

[0184] The control module 75 is used to use the target PI control parameter to adjust the opening of the target proportional valve so that the actual inlet pressure of the hydrogen supply circulation system reaches the target inlet pressure, wherein the target proportional valve is the first proportional valve, or the first proportional valve and the second proportional valve.

[0185] It should be noted here that the description of the above device embodiment is similar to the description of the above method embodiment, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the device embodiment of the present disclosure, please refer to the description of the method embodiment of the present disclosure for understanding.

[0186] Based on the same inventive concept, an embodiment of the present disclosure also provides an electronic device.

[0187] Figure 8 is a schematic diagram of the structure of an electronic device in an embodiment of the present disclosure, see Figure 8 As shown, the electronic device may include: a processor 81, a memory 82, and a bus 83; wherein the processor 81 and the memory 82 communicate with each other via the bus 83; the processor 81 is used to call program instructions in the memory 82 to execute the methods in one or more of the above embodiments.

[0188] It should be noted that the description of the above electronic device embodiment is similar to the description of the above method embodiment, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the electronic device embodiment of the present disclosure, please refer to the description of the method embodiment of the present disclosure for understanding.

[0189] Based on the same inventive concept, an embodiment of the present disclosure further provides a computer-readable storage medium, which may include: a stored program; wherein, when the program is running, the device where the storage medium is located is controlled to execute the method in one or more of the above embodiments.

[0190] It should be noted that the description of the above storage medium embodiment is similar to the description of the above method embodiment, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the storage medium embodiment of the present disclosure, please refer to the description of the method embodiment of the present disclosure for understanding.

[0191] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0192] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A hydrogen fuel cell hydrogen gas path double injection control method, characterized in that: The method is applied to a hydrogen supply circulation system in a hydrogen fuel cell, the hydrogen supply circulation system comprising a first ejector and a first proportional valve corresponding thereto, a second ejector and a second proportional valve corresponding thereto, the second ejector having a larger caliber than the first ejector, the method comprising: Acquire the target power received by the hydrogen supply circulation system, and the current 24V voltage signal and medium voltage pressure signal in the hydrogen supply circulation system; determining a target stack entry pressure according to the target power; According to the 24V voltage signal and the medium voltage pressure signal, a target proportional integral PI control parameter is determined, wherein different 24V voltage signals and medium voltage pressure signals correspond to different PI control parameters, and under different 24V voltage signals and medium voltage pressure signals, the corresponding PI control parameter is determined by testing to adjust the corresponding proportional valve to the corresponding opening, so that the fluctuation of the corresponding proportional valve can be minimized; The target PI control parameter is used to adjust the opening of the target proportional valve so that the actual stack entry pressure of the hydrogen supply circulation system reaches the target stack entry pressure, wherein the target proportional valve is the first proportional valve, or the first proportional valve and the second proportional valve.

2. The method according to claim 1, characterized in that Determining a target proportional integral PI control parameter according to the 24V voltage signal and the medium voltage pressure signal includes: Query the PI control parameters corresponding to the 24V voltage signal and the medium pressure signal from the pressure-voltage-PI control table, wherein the voltage difference between different 24V voltage signals in the pressure-voltage-PI control table is less than the preset voltage difference, and the pressure difference between different medium pressure signals is less than the preset pressure difference, and the PI control parameters corresponding to each pair of 24V voltage signal and medium pressure signal are the PI control parameters with the smallest fluctuation of the stack pressure when the proportional valve is adjusted by using different PI control parameters in advance; The queried PI control parameter is determined as the target PI control parameter.

3. The method according to claim 2, characterized in that The querying of the PI control parameters corresponding to the 24V voltage signal and the medium voltage pressure signal from the pressure-voltage-PI control table includes: Querying a plurality of first PI control parameters corresponding to the 24V voltage signal from the pressure-voltage-PI control table; Determining whether the multiple first PI control parameters are the same; If yes, taking the first PI control parameter as the queried PI control parameter; If not, dividing the plurality of first PI control parameters into second PI control parameters and third PI control parameters, the second PI control parameters being different from the third PI control parameters, and the number of the second PI control parameters being less than the number of the third PI control parameters; Determine whether the medium pressure signal corresponding to the second PI control parameter in the pressure-voltage-PI control table is the same as the medium pressure signal; If they are the same, the second PI control parameter is used as the queried PI control parameter; If they are different, the third PI control parameter is used as the queried PI control parameter.

4. The method according to claim 1, characterized in that: Determining a target proportional integral PI control parameter according to the 24V voltage signal and the medium voltage pressure signal includes: Determining a fourth PI control parameter corresponding to the 24V voltage signal according to a voltage-PI control curve, wherein the voltage-PI control curve is obtained by fitting different 24V voltage signals and their corresponding PI control parameters, a voltage difference between different 24V voltage signals is greater than a preset voltage difference, and a PI control parameter corresponding to each 24V voltage signal is a PI control parameter with the smallest fluctuation of the stack pressure when the proportional valve is adjusted by using different PI control parameters in advance; determining a fifth PI control parameter corresponding to the medium pressure signal according to a pressure-PI control curve, wherein the pressure-PI control curve is obtained by fitting different medium pressure signals and their corresponding PI control parameters, the pressure difference between different medium pressure signals is greater than a preset pressure difference, and the PI control parameter corresponding to each medium pressure signal is a PI control parameter with the smallest fluctuation of the stack pressure when the proportional valve is adjusted by using different PI control parameters in advance; The fourth PI control parameter and the fifth PI control parameter are weighted averaged to obtain the target PI control parameter.

5. The method according to any one of claims 1 to 4, characterized in that Before using the target PI control parameter to adjust the opening of the target proportional valve, the method further includes: Determining whether the target power is greater than a preset power, wherein the first proportional valve and the second proportional valve are adjusted simultaneously above the preset power to minimize fluctuations in the stack pressure; If yes, the first proportional valve and the second proportional valve are determined as the target proportional valves; If not, the first proportional valve is determined as the target proportional valve.

6. The method according to claim 5, characterized in that Before determining whether the target power is greater than the preset power, the method further includes: Obtaining the previous power of the target power; Determining whether the target power is greater than the previous power; The determining whether the target power is greater than a preset power includes: If the target power is greater than the previous power, determining whether the target power is greater than a first preset power; If the target power is less than the previous power, it is determined whether the target power is greater than a second preset power, and the second preset power is less than the first preset power.

7. The method according to any one of claims 1 to 4, characterized in that The target proportional valve is the first proportional valve and the second proportional valve; the target proportional integral PI control parameter is determined according to the 24V voltage signal and the medium voltage pressure signal, including: Determining a first target PI control parameter for the first proportional valve according to the 24V voltage signal and the medium voltage pressure signal; A second target PI control parameter for the second proportional valve is determined based on the 24V voltage signal and the medium voltage pressure signal, wherein the second target PI control parameter is different from the first target PI control parameter, and under different 24V voltage signals and medium voltage pressure signals, the first proportional valve is adjusted to a corresponding opening by the first target PI control parameter, and the second proportional valve is adjusted to a corresponding opening by the second target PI control parameter, so that the stack pressure fluctuation can be minimized.

8. A hydrogen fuel cell hydrogen gas path double injection control device, characterized in that: The device is applied to a hydrogen supply circulation system in a hydrogen fuel cell, the hydrogen supply circulation system comprises a first ejector and a first proportional valve corresponding thereto, a second ejector and a second proportional valve corresponding thereto, the caliber of the second ejector being larger than that of the first ejector, and the device comprises: An acquisition module, used for acquiring the target power received by the hydrogen supply circulation system, and the current 24V voltage signal and medium voltage pressure signal in the hydrogen supply circulation system; A first determination module, configured to determine a target stack entry pressure according to the target power; A second determination module is used to determine a target proportional integral PI control parameter according to the 24V voltage signal and the medium voltage pressure signal, wherein different 24V voltage signals and medium voltage pressure signals correspond to different PI control parameters, and under different 24V voltage signals and medium voltage pressure signals, the corresponding PI control parameter is determined by testing to adjust the corresponding proportional valve to the corresponding opening, so that the fluctuation of the corresponding proportional valve can be minimized; A control module is used to adjust the opening of a target proportional valve by adopting a target PI control parameter so that the actual stack entry pressure of the hydrogen supply circulation system reaches the target stack entry pressure, wherein the target proportional valve is the first proportional valve, or the first proportional valve and the second proportional valve.

9. An electronic device, characterized in that: The electronic device comprises: a processor, a memory, and a bus; wherein the processor and the memory communicate with each other via the bus; and the processor is used to call program instructions in the memory to execute the method as claimed in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The storage medium comprises: a stored program; wherein, when the program is running, the device where the storage medium is located is controlled to execute the method as claimed in any one of claims 1 to 7.

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