Fuel cell fuel circulation supply system, control method, device and electronic equipment

Abstract

This application relates to the field of fuel cell technology, and discloses a fuel cell fuel circulation supply system, control method, device, and electronic equipment. The method includes: acquiring a first flow rate and a first pressure at the fuel inlet of each fuel cell stack, and acquiring a second flow rate and a second pressure at the fuel outlet of each fuel cell stack; when a single fuel cell stack is operating, selecting the target circulation pump with the highest efficiency for fuel circulation supply based on the efficiency map of each circulation pump; when multiple fuel cell stacks are operating simultaneously, acquiring the sum of the second flow rates of each fuel cell stack, pre-allocating the operating flow rate to each circulation pump according to different allocation modes, calculating the comprehensive efficiency of each target circulation pump under each allocation mode, and allocating the operating flow rate to each target circulation pump according to the allocation mode with the highest comprehensive efficiency. The technical solution proposed in this application can reduce accessory energy consumption and improve fuel cell efficiency while ensuring the normal operation of multiple fuel cell stacks.

Description

Technical Field

[0001] This application relates to the field of fuel cell technology and discloses a fuel cell fuel cycle supply system, control method, device and electronic equipment. Background Technology

[0002] Fuel cell vehicles are electric-electric hybrid vehicles consisting of a fuel cell system and a power battery. The power battery provides electrical energy for the operation of system accessories during startup and shutdown of the fuel cell system.

[0003] Currently, the rated power of fuel cell systems is mostly around 100kW, which can meet the needs of most passenger cars or light commercial vehicles. However, heavy commercial vehicles may require fuel cell systems with a power of over 300kW, which requires two or more fuel cell systems to be connected in parallel to provide energy for the vehicle.

[0004] If multiple fuel cell modules share a single hydrogen supply and circulation system, a single hydrogen circulation system may not be able to meet the normal hydrogen demand of each module when all modules are operating at high power. Conversely, if each fuel cell module is equipped with an independent hydrogen supply and circulation system, the operation of all hydrogen supply and circulation systems in the low-power range will inevitably lead to energy loss. Therefore, this application proposes a control method for fuel cell fuel circulation supply. This method connects the fuel supply and circulation systems of all fuel cell systems through pipelines and control valves, rationally allocating demand among multiple circulation pumps. This achieves the goal of reducing accessory energy consumption and improving fuel cell module efficiency while ensuring the normal operation of multiple modules. Summary of the Invention

[0005] This application relates to the field of fuel cell technology, and discloses a fuel cell fuel circulation supply system, control method, device, and electronic equipment. To reduce accessory energy consumption and improve fuel cell module efficiency, this application obtains the fuel pressure and flow requirements of multiple fuel cell stacks, and based on fuel circulation efficiency and the flow rate, pressure, and efficiency characteristics of each circulation pump, rationally allocates the requirements among the multiple circulation pumps, thereby achieving the goal of improving the fuel circulation rate and overall efficiency of multiple fuel cell modules.

[0006] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0007] According to a first aspect of the embodiments of this application, a fuel cell fuel circulation supply system is provided, the system comprising: at least two fuel cell stacks; a main fuel supply pipeline for supplying fuel to each fuel cell stack; and at least two fuel circulation supply pipelines, each fuel circulation supply pipeline corresponding to one of the fuel cell stacks, for recovering unconsumed fuel from the corresponding fuel cell stack and pumping the unconsumed fuel into the main fuel supply pipeline via circulation pumps disposed in the fuel circulation supply pipelines; wherein any adjacent fuel circulation supply pipelines are connected by a first control valve and a second control valve, the two ends of the first control valve being respectively close to the inlet of the circulation pump in any adjacent fuel circulation supply pipeline, and the two ends of the second control valve being respectively close to the outlet of the circulation pump in any adjacent fuel circulation supply pipeline.

[0008] According to a second aspect of the embodiments of this application, a control method for a fuel cell fuel circulation supply system is provided. The method includes: acquiring a first flow rate and a first pressure at the fuel inlet of each fuel cell stack, acquiring a second flow rate and a second pressure at the fuel outlet of each fuel cell stack, and acquiring an upper limit pressure ratio and an upper limit flow rate of the circulation pumps in each fuel circulation supply pipeline; if only one target fuel cell stack has a first flow rate greater than zero, then based on the first flow rate, first pressure, second flow rate, and second pressure corresponding to the target fuel cell stack, determining the operating point corresponding to each circulation pump in a circulation pump efficiency map; based on the operating point corresponding to each circulation pump, determining the operating efficiency, operating pressure ratio, and operating flow rate of each circulation pump, so as to determine the first... A target circulation pump is configured to pump unconsumed fuel from the target fuel cell stack into the main fuel supply line. If at least two fuel cell stacks have a first flow rate greater than zero, the pressure difference between any one of the at least two fuel cell stacks and the other fuel cell stacks is calculated. If the pressure difference is greater than a set pressure difference threshold, the first and second control valves between the fuel circulation supply line of the target fuel cell stack and the fuel circulation supply line of the other fuel cell stacks are closed. This controls the second target circulation pump in the fuel circulation supply line of the target fuel cell stack to pump unconsumed fuel from the target fuel cell stack into the main fuel supply line, and controls the third target circulation pump in the fuel circulation supply line of the other fuel cell stacks to pump unconsumed fuel from the other fuel cell stacks into the main fuel supply line.

[0009] In one embodiment of this application, based on the aforementioned scheme, determining the first target circulating pump from among the circulating pumps based on the operating efficiency, operating pressure ratio, and operating flow rate of each circulating pump includes: if the circulating pump in the fuel circulation supply pipeline where the target fuel stack is located has the highest operating efficiency, or the operating pressure ratio of the circulating pump in the fuel circulation supply pipeline where the target fuel stack is located is greater than the upper limit pressure ratio of the circulating pump in the fuel circulation supply pipeline where other fuel stacks are located, or the operating flow rate of the circulating pump in the fuel circulation supply pipeline where the target fuel stack is located is greater than the upper limit flow rate of the circulating pump in the fuel circulation supply pipeline where other fuel stacks are located, then the circulating pump in the fuel circulation supply pipeline where the target fuel stack is located is designated as the first target circulating pump.

[0010] In one embodiment of this application, based on the foregoing scheme, the method further includes: if the operating efficiency of the circulation pump in the fuel circulation supply pipeline of a fuel cell stack other than the target fuel cell stack is the highest, and the operating pressure ratio of the circulation pump in the fuel circulation supply pipeline of the target fuel cell stack is less than or equal to the upper limit pressure ratio of the circulation pump in the fuel circulation supply pipeline of a fuel cell stack other than the target fuel cell stack, and the workload of the circulation pump in the fuel circulation supply pipeline of the target fuel cell stack is less than or equal to the upper limit flow rate of the circulation pump in the fuel circulation supply pipeline of a fuel cell stack other than the target fuel cell stack, then the circulation pump with the highest operating efficiency among the circulation pumps in the fuel circulation supply pipeline of the fuel cell stack other than the target fuel cell stack is selected as the first target circulation pump.

[0011] In one embodiment of this application, based on the foregoing scheme, controlling the first target circulation pump to pump unconsumed fuel from the target fuel cell stack into the main fuel supply pipeline includes: determining the operating parameters of the first target circulation pump based on the operating efficiency, operating pressure ratio, and operating flow rate of the first target circulation pump; and controlling the first target circulation pump to pump unconsumed fuel from the target fuel cell stack into the main fuel supply pipeline according to the operating parameters.

[0012] In one embodiment of this application, based on the aforementioned scheme, controlling the third target circulation pump in the fuel circulation supply pipeline where the other fuel cells are located to pump unconsumed fuel from the other fuel cells into the main fuel supply pipeline includes: calculating the second total flow rate of the fuel outlets of each of the other fuel cells; pre-allocating the working flow rate of each of the third target circulation pumps based on the second total flow rate according to different allocation modes, and calculating the overall efficiency of the third target circulation pumps under each allocation mode; allocating the working flow rate of each of the third target circulation pumps according to the allocation mode with the highest overall efficiency, and controlling each of the third target circulation pumps to pump the unconsumed fuel from the other fuel cells into the main fuel supply pipeline according to the allocated working flow rate.

[0013] In one embodiment of this application, based on the foregoing scheme, the calculation of the overall efficiency of the third target circulation pump under each allocation mode includes: for each allocation mode, calculating the energy consumption of each third target circulation pump based on the working flow rate allocated to each third target circulation pump; and calculating the overall efficiency of the third target circulation pump under each allocation mode based on the energy consumption of each third target circulation pump and the sum of the second flow rates.

[0014] In one embodiment of this application, based on the foregoing scheme, the method further includes: calculating the sum of the upper limit flow rates of each of the third target circulation pumps; if the sum of the second flow rates is greater than the sum of the upper limit flow rates, then closing the first control valve and the second control valve between any two fuel circulation supply lines of other fuel cells, so as to control each of the third target circulation pumps to pump the unconsumed fuel in the other fuel cells into the main fuel supply line according to their respective upper limit flow rates.

[0015] According to a third aspect of the embodiments of this application, a control device for a fuel cell fuel circulation supply system is provided. The device includes: an acquisition unit, configured to acquire a first flow rate and a first pressure at the fuel inlet of each fuel stack, a second flow rate and a second pressure at the fuel outlet of each fuel stack, and an upper limit pressure ratio and an upper limit flow rate of the circulation pumps in each fuel circulation supply pipeline; a determination unit, configured to determine the operating point of each circulation pump based on the first flow rate, first pressure, second flow rate and second pressure corresponding to the target fuel stack, if only one target fuel stack has a first flow rate greater than zero; and a first control unit, configured to determine the operating efficiency, operating pressure ratio and operating flow rate of each circulation pump based on the operating point of each circulation pump, so as to obtain the upper limit pressure ratio and upper limit flow rate of each circulation pump from each circulation pump based on the operating efficiency, operating pressure ratio and operating flow rate of each circulation pump. The system identifies a first target circulation pump and controls it to pump unconsumed fuel from the target fuel cell stack into the main fuel supply line. A calculation unit is used to calculate the pressure difference between any one of the at least two fuel cell stacks and the other stacks if the first flow rate corresponding to at least two fuel cell stacks is greater than zero. A second control unit is used to close a first control valve and a second control valve between the fuel circulation supply line of the target fuel cell stack and the fuel circulation supply line of the other fuel cell stacks if the pressure difference is greater than a set pressure difference threshold. This controls a second target circulation pump in the fuel circulation supply line of the target fuel cell stack to pump unconsumed fuel from the target fuel cell stack into the main fuel supply line, and controls a third target circulation pump in the fuel circulation supply line of the other fuel cell stacks to pump unconsumed fuel from the other fuel cell stacks into the main fuel supply line.

[0016] According to a fourth aspect of the present application, an electronic device is provided, the electronic device including one or more processors and one or more memories, the one or more memories storing at least one piece of program code, the at least one piece of program code being loaded and executed by the one or more processors to implement the control method of the fuel cell fuel cycle supply system as described in any of the above embodiments.

[0017] In the technical solution proposed in this application, the fuel supply and circulation system of all fuel cell systems are connected through pipelines and control valves. The first flow rate and first pressure at the fuel inlet of each fuel cell stack are obtained, as well as the second flow rate and second pressure at the fuel outlet of each fuel cell stack. When only one target fuel cell stack is operating, based on the first flow rate, first pressure, second flow rate, second pressure, and the circulation pump efficiency map of each circulation pump, the operating point corresponding to each circulation pump is determined. Based on the operating point corresponding to each circulation pump, the operating efficiency, operating pressure ratio, and operating flow rate of each circulation pump are determined. Finally, based on the operating efficiency, operating pressure ratio, and operating flow rate of each circulation pump, the efficiency, operating pressure ratio, and operating flow rate of each circulation pump are determined. A first target circulation pump is designated and controlled to pump unconsumed fuel from the target fuel cell stack into the main fuel supply pipeline. When multiple fuel cell stacks are operating, the sum of the second flow rates at the fuel output ports of each of the other fuel cell stacks is calculated. Based on this sum of second flow rates, a pre-allocation of operating flow rates is made to each of the third target circulation pumps according to different allocation modes. The overall efficiency of the third target circulation pumps under each allocation mode is calculated. Operating flow rates are allocated to each of the third target circulation pumps according to the allocation mode with the highest overall efficiency. Each third target circulation pump is then controlled to pump unconsumed fuel from the other fuel cell stacks into the main fuel supply pipeline according to its allocated operating flow rate. The technical solution proposed in this application can ensure that the overall efficiency of multiple fuel cell modules is always at its optimal state, reducing overall vehicle fuel consumption and improving vehicle economy.

[0018] The one or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0019] The control method for the fuel cell fuel circulation supply system proposed in this application connects the fuel supply of all fuel cell systems to the circulation system through pipelines and control valves, and rationally distributes the demand among multiple circulation pumps. Under the premise of ensuring the normal operation of multiple modules, it not only reduces the energy consumption of accessories, but also improves the efficiency of fuel cell modules to a certain extent.

[0020] The control method for the fuel cell fuel cycle supply system proposed in this application, based on the hydrogen intake pressure and flow requirements of each stack of multiple fuel cell systems and their respective secondary pressure and flow information, rationally allocates the hydrogen circulation mode among each hydrogen circulation pump, and traverses and optimizes to obtain the optimal circulation working scheme among multiple hydrogen circulation pumps, so that the overall efficiency of multiple fuel cell modules is always in the best state, reducing the hydrogen consumption of the whole vehicle and improving the economy of the whole vehicle.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0023] Figure 1 A schematic diagram of a fuel cell fuel cycle supply system according to an embodiment of this application is shown;

[0024] Figure 2 A flowchart of a control method for a fuel cell fuel cycle supply system according to an embodiment of this application is shown;

[0025] Figure 3 Schematic diagrams of fuel cell fuel cycle supply systems in some specific embodiments of this application are shown;

[0026] Figure 4 An analytical logic diagram of the control method for the fuel cell fuel cycle supply system in an embodiment of this application is shown;

[0027] Figure 5 The following diagram illustrates the operating efficiency map of the circulating pump in some specific embodiments of this application;

[0028] Figure 6 A block diagram of the control device for a fuel cell fuel cycle supply system according to an embodiment of this application is shown;

[0029] Figure 7 A schematic diagram of the structure of a computer system suitable for implementing the embodiments of this application is shown;

[0030] The annotations in the attached figures are explained as follows:

[0031] 100—Fuel cell fuel cycle supply system; 101—Fuel stack;

[0032] 102—Main fuel supply pipeline, 103—Fuel recirculation supply pipeline

[0033] 104—Circulation pump, 105—First control valve,

[0034] 106—Second control valve, 107—Fuel pressure sensor

[0035] 108—Fuel flow sensor, 109—Circulation pump input control valve,

[0036] 110—Circulation pump output control valve, 111—Fuel input control valve. Detailed Implementation

[0037] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0038] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0039] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0040] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0042] Figure 1 A schematic diagram of a fuel cell fuel cycle supply system according to an embodiment of this application is shown.

[0043] like Figure 1As shown, in this application, the fuel cell fuel cycle supply system 100 includes: at least two fuel cell stacks 101; a main fuel supply pipeline 102 for supplying fuel to each fuel cell stack 101; and at least two fuel cycle supply pipelines 103, each fuel cycle supply pipeline corresponding to one of the fuel cell stacks 101, for recovering unconsumed fuel from the corresponding fuel cell stack 101, and pumping the unconsumed fuel into the main fuel supply pipeline 102 via a circulation pump 104 disposed in the fuel cycle supply pipeline 103; wherein any adjacent fuel cycle supply pipelines 103 are connected by a first control valve 105 and a second control valve 106, the two ends of the first control valve 105 being close to the inlet of the circulation pump 104 in any adjacent fuel cycle supply pipeline 103, and the two ends of the second control valve 106 being close to the outlet of the circulation pump 104 in any adjacent fuel cycle supply pipeline 103.

[0044] In this application, fuel is supplied to each fuel cell stack 101 through a main fuel supply pipeline 102, and unconsumed fuel from the corresponding fuel cell stack 101 is recovered through a fuel circulation supply pipeline 103. The unconsumed fuel is pumped into the main fuel supply pipeline 102 by a circulation pump 104 installed in the fuel circulation supply pipeline 103, thereby enabling the supply and recycling of fuel for a single fuel cell stack 101. Any adjacent fuel circulation supply pipelines 103 are connected by a first control valve 105 and a second control valve 106. The two ends of the first control valve 105 are respectively close to the inlet of the circulation pump 104 in any adjacent fuel circulation supply pipeline 103, and the two ends of the second control valve 106 are respectively close to the outlet of the circulation pump 104 in any adjacent fuel circulation supply pipeline 103, thereby enabling the recycling of unconsumed fuel among multiple fuel cell stacks 101.

[0045] In this application, the fuel cell fuel circulation supply system 100 may further include a fuel pressure sensor 107, a fuel flow sensor 108, a circulation pump input control valve 109, a circulation pump output control valve 110, and a fuel input control valve 111. The fuel pressure sensor 107 and the fuel flow sensor 108 can be installed in the main fuel supply line 102 and the fuel circulation supply line 103. The fuel pressure sensor 107 and the fuel flow sensor 108 can be used to obtain the pressure and flow rate of the fuel inlet of the fuel cell stack 101 and the pressure and flow rate of the fuel outlet of the fuel cell stack 101. They can also be used to obtain the flow rate of the fuel outlet of the circulation pump 104 and the pressure of the fuel entering the adjacent fuel circulation supply line 103. The circulation pump input control valve 109 can be used to control whether fuel is input into the circulation pump 104. The circulation pump output control valve 110 can be used to control whether the circulation pump 104 outputs fuel. The fuel input control valve 111 can be used to control the fuel of the fuel cell to be input from the fuel storage tank into the fuel circulation supply line 103. The fuel storage tank can be used to store fuel and supply fuel to the fuel cell stack 101.

[0046] In this application, the main fuel supply pipeline 102 may further include an intake valve (not shown in the figure) and a proportional valve (not shown in the figure). The intake valve and the proportional valve can be used to control the flow rate of fuel supplied to each fuel cell stack 101. The fuel circulation supply pipeline 103 may further include a water separator (not shown in the figure) and a check valve (not shown in the figure). The water separator can be used to separate water vapor from the mixed gas output by the fuel cell stack 101. The check valve can be used to control the unconsumed fuel to flow unidirectionally to the circulation pump 104. The fuel cell fuel circulation supply system 100 may further include an exhaust valve (not shown in the figure). The exhaust valve can be used to discharge the exhaust gas output by the fuel cell stack 101.

[0047] In this application, the fuel cell fuel can be hydrogen or other gaseous fuels.

[0048] Based on the fuel cell fuel cycle supply system proposed in the first aspect of this application, this application also proposes a control method for the fuel cell fuel cycle supply system. The implementation details of the technical solutions of the embodiments of this application are described in detail below:

[0049] Figure 2 A flowchart of a control method for a fuel cell fuel cycle supply system according to an embodiment of this application is shown.

[0050] like Figure 2As shown, the control method of the fuel cell fuel cycle supply system includes at least steps 210 to 290.

[0051] The following will be about Figure 2 Steps 210 to 290 are described in detail below:

[0052] In step 210, the first flow rate and first pressure of the fuel inlet of each fuel cell stack are obtained, as are the second flow rate and second pressure of the fuel outlet of each fuel cell stack, and the upper limit pressure ratio and upper limit flow rate of the circulation pump in each fuel circulation supply pipeline are obtained.

[0053] In this application, the fuel infeed pressure and flow requirements of each fuel cell stack during operation, as well as the fuel outfeed pressure and flow information of each fuel cell stack during operation, can be determined based on the operating parameters of each fuel cell stack. The first flow rate and first pressure of the fuel infeed port of each fuel cell stack, as well as the second flow rate and second pressure of the fuel outfeed port of each fuel cell stack, can be obtained by flow sensors and pressure sensors located near the fuel infeed port and fuel outfeed port of each fuel cell stack.

[0054] In this application, if the first flow rate and first pressure of the fuel inlet of each fuel cell stack do not meet the fuel inlet pressure and flow rate requirements of each fuel cell stack, the fuel flow rate and pressure of the main fuel supply pipeline are adjusted to meet the fuel inlet pressure and flow rate requirements of each fuel cell stack.

[0055] In this application, if the first flow rate and first pressure of the fuel inlet of each fuel cell stack meet the respective fuel inlet pressure and flow rate requirements during operation of each fuel cell stack, and the second flow rate and second pressure of the fuel outlet of each fuel cell stack do not meet the fuel outlet pressure and flow rate requirements of each fuel cell stack, a warning message is triggered to remind the fuel cell stack to be inspected and repaired.

[0056] Continue to refer to Figure 2 In step 230, if there is only one target fuel cell stack with a first flow rate greater than zero, then based on the first flow rate, first pressure, second flow rate and second pressure corresponding to the target fuel cell stack, the operating point corresponding to each circulating pump is determined in the circulating pump efficiency Map of each circulating pump.

[0057] Continue to refer to Figure 2 In step 250, based on the operating point of each circulating pump, the working efficiency, working pressure ratio, and working flow rate of each circulating pump are determined. Based on the working efficiency, working pressure ratio, and working flow rate of each circulating pump, a first target circulating pump is determined from the circulating pumps, and the first target circulating pump is controlled to pump the unconsumed fuel in the target fuel stack into the main fuel supply pipeline.

[0058] In this application, the working pressure ratio is the ratio of the pressure at the outlet of the circulating pump to the pressure at the inlet of the circulating pump, and the working flow rate is the flow rate of fuel flowing through the circulating pump.

[0059] In this application, if only one target fuel cell stack is in operation, only one circulation pump is needed to circulate fuel to the target fuel cell stack. That is, the first target circulation pump in each circulation pump is controlled to pump the unconsumed fuel in the target fuel cell stack into the main fuel supply pipeline.

[0060] Continue to refer to Figure 2 In step 270, if there are at least two electric stacks with a first flow rate greater than zero, then the pressure difference between any one of the at least two electric stacks and the other electric stacks is calculated.

[0061] In this application, the pressure difference is used to determine whether the fuel circulation demand of each working fuel cell stack can be reasonably distributed among multiple circulation pumps to improve the overall efficiency of the fuel cell system.

[0062] Continue to refer to Figure 2 In step 290, if the pressure difference value is greater than the set pressure difference threshold, the first control valve and the second control valve between the fuel circulation supply line of any one fuel cell stack and the fuel circulation supply line of the other fuel cell stacks are closed. This controls the second target circulation pump in the fuel circulation supply line of any one fuel cell stack to pump the unconsumed fuel in the one fuel cell stack into the main fuel supply line, and controls the third target circulation pump in the fuel circulation supply line of the other fuel cell stacks to pump the unconsumed fuel in the other fuel cell stacks into the main fuel supply line.

[0063] In this application, if the pressure difference value is greater than a set pressure difference threshold, the first control valve and the second control valve between the fuel circulation supply pipeline of any one fuel cell stack and the fuel circulation supply pipeline of the other fuel cell stacks are closed, so as to control the second target circulation pump in the fuel circulation supply pipeline of any one fuel cell stack to pump the unconsumed fuel in the fuel cell stack into the main fuel supply pipeline, that is, to control the second target circulation pump in the fuel circulation supply pipeline of any one fuel cell stack to perform fuel circulation supply for its corresponding fuel cell stack module.

[0064] In this application, if there are at least two fuel cell stacks with a first flow rate greater than zero, and if the pressure difference between any two fuel cell stacks is greater than the set pressure difference threshold, then each second target circulation pump is controlled to supply fuel to the fuel cell stack module corresponding to each second target circulation pump, that is, each second target circulation pump is controlled to pump the unconsumed fuel in any one of the fuel cell stacks into the main fuel supply pipeline.

[0065] In one embodiment of this application, determining the first target circulating pump from among the circulating pumps based on their operating efficiency, operating pressure ratio, and operating flow rate includes: if the circulating pump in the fuel circulation supply pipeline where the target fuel cell stack is located has the highest operating efficiency, or the operating pressure ratio of the circulating pump in the fuel circulation supply pipeline where the target fuel cell stack is located is greater than the upper limit pressure ratio of the circulating pump in the fuel circulation supply pipeline where other fuel cell stacks are located, or the operating flow rate of the circulating pump in the fuel circulation supply pipeline where the target fuel cell stack is located is greater than the upper limit flow rate of the circulating pump in the fuel circulation supply pipeline where other fuel cell stacks are located, then the circulating pump in the fuel circulation supply pipeline where the target fuel cell stack is located is designated as the first target circulating pump.

[0066] In this application, if the circulation pump in the fuel circulation supply pipeline where the target fuel cell stack is located has the highest operating efficiency, and the circulation pump in the fuel circulation supply pipeline where other fuel cell stacks are located also has the highest operating efficiency, then the circulation pump in the fuel circulation supply pipeline where the target fuel cell stack is located is designated as the first target circulation pump to avoid unnecessary energy loss.

[0067] In this application, the upper limit pressure ratio of the circulation pump in the fuel circulation supply pipeline where the target fuel stack is located is greater than or equal to the operating pressure ratio of the circulation pump in the fuel circulation supply pipeline where the target fuel stack is located, and the upper limit flow rate of the circulation pump in the fuel circulation supply pipeline where the target fuel stack is located is greater than or equal to the operating flow rate of the circulation pump in the fuel circulation supply pipeline where the target fuel stack is located.

[0068] In one embodiment of this application, the method further includes: if the circulation pump in the fuel circulation supply pipeline of a fuel cell stack other than the target fuel cell stack has the highest operating efficiency, and the operating pressure ratio of the circulation pump in the fuel circulation supply pipeline of the target fuel cell stack is less than or equal to the upper limit pressure ratio of the circulation pump in the fuel circulation supply pipeline of a fuel cell stack other than the target fuel cell stack, and the workload of the circulation pump in the fuel circulation supply pipeline of the target fuel cell stack is less than or equal to the upper limit flow rate of the circulation pump in the fuel circulation supply pipeline of a fuel cell stack other than the target fuel cell stack, then the circulation pump with the highest operating efficiency among the circulation pumps in the fuel circulation supply pipeline of the fuel cell stack other than the target fuel cell stack is selected as the first target circulation pump.

[0069] In this application, the upper limit pressure ratio corresponding to the first target circulation pump is greater than the operating pressure ratio corresponding to the circulation pump in the fuel circulation supply pipeline where the target fuel cell stack is located, and the upper limit flow rate corresponding to the first target circulation pump is greater than the operating flow rate corresponding to the circulation pump in the fuel circulation supply pipeline where the target fuel cell stack is located.

[0070] In this application, if the operating efficiency of the circulation pump in the fuel circulation supply pipeline where the target fuel stack is located is not the highest, then one of the circulation pumps with the highest operating efficiency in the fuel circulation supply pipeline where the fuel stack outside the target fuel stack is located is selected as the first target circulation pump.

[0071] In one embodiment of this application, controlling the first target circulation pump to pump unconsumed fuel from the target fuel cell stack into the main fuel supply line includes: determining the operating parameters of the first target circulation pump based on its operating efficiency, operating pressure ratio, and operating flow rate; and controlling the first target circulation pump to pump unconsumed fuel from the target fuel cell stack into the main fuel supply line according to the operating parameters.

[0072] In this application, the operating parameters of the first target circulating pump are determined based on the working efficiency, working pressure ratio, and working flow rate of the first target circulating pump. The operating parameters include at least the rotational speed of the circulating pump.

[0073] In one embodiment of this application, controlling the third target circulation pump in the fuel circulation supply pipeline of the other fuel cells to pump unconsumed fuel from the other fuel cells into the main fuel supply pipeline includes: calculating the second total flow rate of the fuel outlets of each of the other fuel cells; pre-allocating the working flow rate of each of the third target circulation pumps based on the second total flow rate according to different allocation modes, and calculating the overall efficiency of the third target circulation pumps under each allocation mode; allocating the working flow rate of each of the third target circulation pumps according to the allocation mode with the highest overall efficiency, and controlling each of the third target circulation pumps to pump the unconsumed fuel from the other fuel cells into the main fuel supply pipeline according to the allocated working flow rate.

[0074] In this application, the second flow rate summation of the fuel output ports of each of the other fuel cells is calculated; and the working flow rate is pre-allocated to each of the third target circulation pumps based on the second flow rate summation according to different allocation modes, wherein the working flow rate allocated to each of the third target circulation pumps is less than or equal to the upper limit flow rate corresponding to the third target circulation pump.

[0075] In this application, the overall efficiency of the third target circulation pump under each allocation mode is calculated. According to the allocation mode with the highest overall efficiency, the working flow rate is allocated to each of the third target circulation pumps. Each of the third target circulation pumps is controlled to pump the unconsumed fuel in the other fuel stacks into the main fuel supply pipeline according to the allocated working flow rate, so as to improve the circulation efficiency of the unconsumed fuel.

[0076] In one embodiment of this application, the calculation of the overall efficiency of the third target circulation pump under each allocation mode includes: for each allocation mode, calculating the energy consumption of each third target circulation pump based on the working flow rate allocated to each third target circulation pump; and calculating the overall efficiency of the third target circulation pump under each allocation mode based on the energy consumption of each third target circulation pump and the sum of the second flow rates.

[0077] In this application, for each allocation mode, based on the working flow rate allocated to each of the third target circulation pumps, the energy consumption of each of the third target circulation pumps is calculated, the total energy consumption of each of the third target circulation pumps is calculated, the ratio of the sum of the second flow rates to the total energy consumption of each of the third target circulation pumps is obtained, and the ratio is used as the comprehensive efficiency of the third target circulation pumps in each allocation mode.

[0078] In one embodiment of this application, the method further includes: calculating the sum of the upper limit flow rates of each of the third target circulation pumps; if the sum of the second flow rates is greater than the sum of the upper limit flow rates, closing the first control valve and the second control valve between any two fuel circulation supply lines of other fuel cells, so as to control each of the third target circulation pumps to pump the unconsumed fuel in the other fuel cells into the main fuel supply line according to their respective upper limit flow rates.

[0079] In this application, if the sum of the second flow rate is greater than the sum of the upper limit flow rate, it indicates that the sum of the second flow rate cannot be reasonably distributed by multiple circulation pumps. In this case, the first control valve and the second control valve between any two fuel circulation supply lines of other fuel cells are closed, and each of the third target circulation pumps is controlled to pump the unconsumed fuel in the other fuel cells into the main fuel supply line according to its corresponding upper limit flow rate.

[0080] To facilitate a better understanding of the control method for the fuel cell fuel cycle supply system proposed in this application, two hydrogen fuel cell stacks will be used as examples below, combined with... Figure 3 and Figure 4 This application will be used to illustrate the control method for the fuel cell fuel cycle supply system proposed in this application.

[0081] Figure 3 A schematic diagram of a fuel cell fuel cycle supply system in some specific embodiments of this application is shown.

[0082] Figure 4 An analytical logic diagram of the control method for the fuel cell fuel cycle supply system in an embodiment of this application is shown.

[0083] like Figure 3 As shown, the fuel cell fuel circulation supply system includes two fuel cell modules connected by a first control valve and a second control valve, supplying hydrogen to the fuel cell stack via a hydrogen storage tank. Each fuel cell module includes a fuel cell stack, a hydrogen circulation pump, a fuel pressure sensor, a fuel flow sensor, an inlet valve, a proportional valve, a water separator, an exhaust valve, a check valve, a circulation pump input control valve, and a circulation pump output control valve.

[0084] like Figure 4 As shown, P1 request The first pressure of fuel cell stack 1, P2 request For the first pressure of fuel cell stack 2, MF1 request MF2 is the first flow rate of fuel cell stack 1. request P1 is the first flow rate of fuel cell stack 2. out The second pressure for fuel cell stack 1, P2 out For the second pressure of fuel cell stack 2, MF1out For the second flow rate of fuel cell stack 1, MF2 out R1 is the second flow rate of fuel cell stack 2. max R2 is the upper limit pressure ratio of hydrogen circulation pump 1. max MF1 is the upper limit pressure ratio of hydrogen circulation pump 2. max MF2 is the upper limit flow rate of hydrogen circulation pump 1. max MF1 is the upper limit flow rate of hydrogen circulation pump 2, MF2 is the working flow rate of hydrogen circulation pump 1, and MF2 is the working flow rate of hydrogen circulation pump 2.

[0085] When only one fuel cell has a first current flow greater than zero, the following actions can be taken depending on the situation:

[0086] ①If MF1 request >0 and MF2 request If the value is ≤0, then fuel cell 1 is in the working state and fuel cell 2 is in the resting state. At this time, through P1 request P1 out With MF1 out Calculate the operating point of the hydrogen circulation pump and obtain the operating pressure ratio R = P1. reques / P1 out Working flow MF = MF1 out Based on this operating condition and the efficiency map of the circulating pump, the efficiencies η1 and η2 of hydrogen circulating pump 1 and hydrogen circulating pump 2 running alone under this condition are obtained.

[0087] ②If η1≥η2 or R>R2 max Or MF > MF2 max Then, hydrogen circulation pump 1 completes the hydrogen circulation supply, hydrogen circulation pump 2 is turned off, and the status of each hydrogen circulation system control valve is: K in -0 to turn off, K in -1 Open, K in -2 Close, K out -0 to close, K out -1 Open, K out -2 Off;

[0088] If η1 < η2 and R ≤ R2 max And MF≤MF2 max Then, hydrogen circulation pump 2 will complete the hydrogen circulation supply. When hydrogen circulation pump 1 is turned off, the control valve status of each hydrogen circulation system will be: K in -0 Open, K in -1 Close, K in -2 Open, K out -0 Open, K out -1 Open, K out -2 Off;

[0089] ③If MF1 request ≤0 and MF2 request If the value is greater than 0, then fuel cell 1 is in a resting state and fuel cell 2 is in a working state. At this time, through P2... request P2 out With MF2 out Calculate the operating point of the hydrogen circulation pump and obtain the operating pressure ratio R = P2. reques / P2 out Working flow MF = MF2 out Based on this operating condition and the efficiency map of the circulating pump, the efficiencies η1 and η2 of hydrogen circulating pump 1 and hydrogen circulating pump 2 running alone under this condition are obtained.

[0090] ④ If η1≥η2 and R≤R1 max And MF≤MF1 max Then, hydrogen circulation pump 1 completes the hydrogen circulation supply, hydrogen circulation pump 2 is turned off, and the status of each hydrogen circulation system control valve is: K in -0 Open, K in -1 Open, K in -2 Close, K out -0 Open, K out -1 Close, K out -2 Open;

[0091] If η1 < η2 or R > R1 max Or MF > MF1 max Then, hydrogen circulation pump 2 will complete the hydrogen circulation supply. When hydrogen circulation pump 1 is turned off, the control valve status of each hydrogen circulation system will be: K in -0 to close, K in -1 Close, K in -2 Open, K out -0 to close, K out -1 Close, K out -2 Open.

[0092] When two fuel cells have a first flow rate greater than zero, different solutions can be adopted based on the first pressure difference between the fuel cells and the total outflow rate, as follows:

[0093] ① If the first pressure difference between fuel cell stack 1 and fuel cell stack 2 is greater than ΔP, i.e. |P1 request -P2 request If |>ΔP, then each hydrogen circulation pump provides hydrogen circulation supply to its respective fuel cell stack, and the control valve status of each hydrogen circulation system is: K in -0 to close, K in -1 Open, K in -2 Open, K out -0 to close, K out -1 Open, Kout -2 Open;

[0094] ② If the total output flow rate of multiple fuel cell stacks is greater than the sum of the upper limit flow rates of each hydrogen circulation pump, then each hydrogen circulation pump will output according to its corresponding upper limit flow rate to provide hydrogen circulation supply to its respective fuel cell stack module, even if the operating flow rate of hydrogen circulation pump 1 MF1 = MF max The working flow rate of hydrogen circulation pump 2 is MF2 = MF2 max The status of the control valves in each hydrogen circulation system is as follows: K in -0 to close, K in -1 Open, K in -2 Open, K out -0 to close, K out -1 Open, K out -2 Open;

[0095] ③ If the total outflow rate of fuel cell stack 1 and fuel cell stack 2 is less than or equal to the upper limit flow rate of any one of the hydrogen recirculation pumps, then the total second flow rate MF will be used as the basis for determining the flow rate. total A reasonable allocation is made among multiple hydrogen circulation pumps, and the overall efficiency of each circulation pump under each allocation mode is calculated. Based on the allocation mode with the highest overall efficiency, the working flow rate is allocated to each of the third target circulation pumps. Each of the third target circulation pumps is then controlled to pump unconsumed fuel from other fuel cells into the main fuel supply pipeline according to its allocated working flow rate. The specific allocation modes are as follows:

[0096] Let: The first pressure of fuel cell 1 be equal to the first pressure of fuel cell 2, that is, P1 = P2 = (P1 request +P2 request ) / 2,

[0097] The operating flow rate of hydrogen circulation pump 1 is MF11 = MF total Calculate the energy consumption E11 of hydrogen circulation pump 1 at this time. The operating flow rate MF21 of hydrogen circulation pump 2 is 0. Calculate the energy consumption E21 of hydrogen circulation pump 2 at this time. The overall efficiency η1 = MF total / (E11+E21);

[0098] Let: The first pressure of fuel cell 1 be equal to the first pressure of fuel cell 2, that is, P1 = P2 = (P1 request +P2 request ) / 2, the working flow rate of hydrogen circulation pump 1 is MF12 = MF total -ΔMF, calculate the energy consumption E12 of hydrogen circulation pump 1 at this time, the working flow rate of hydrogen circulation pump 2 MF22=ΔMF, calculate the energy consumption E22 of hydrogen circulation pump 2 at this time, and the overall efficiency η2=MF total / (E12+E22);

[0099] Let: The first pressure of fuel cell 1 be equal to the first pressure of fuel cell 2, that is, P1 = P2 = (P1 request +P2 request ) / 2, the working flow rate of hydrogen circulation pump 1 is MF13 = MF total -2ΔMF, calculate the energy consumption E13 of hydrogen circulation pump 1 at this time, the working flow rate of hydrogen circulation pump 2 MF23=2ΔMF, calculate the energy consumption E23 of hydrogen circulation pump 2 at this time, and the overall efficiency η3=MF total / (E13+E23); and so on.

[0100] Let: The first pressure of fuel cell 1 be equal to the first pressure of fuel cell 2, that is, P1 = P2 = (P1 request +P2 request ) / 2, the operating flow rate MF1 of hydrogen circulation pump 1 n =0, calculate the energy consumption E1 of hydrogen circulation pump 1 at this time. n The operating flow rate of hydrogen circulation pump 2 is MF2 n =MF total Calculate the energy consumption E2 of hydrogen circulation pump 2 at this time. n At this point, the overall efficiency η n =MF total / (E1 n +E2 n );

[0101] Let: etam=max(eta1, eta2, eta3...etan), when eta=etam, MF1=MF1 m MF2 = MF2 m By adjusting control valve K in -0 opening K in =K inm Make the working flow rate of hydrogen circulation pump 1 MF1 = MF1 m The working flow rate of hydrogen circulation pump 2 is MF2 = MF2 m The status of the control valves in each hydrogen circulation system is as follows: K in -0 opening degree: K in =K inm K out -0 opening degree: K out =K outm K in -1 Open, K in -2 Open, K out -1 Open, K out -2 Open;

[0102] ④ If the total outflow rate of multiple fuel cell stacks is greater than the upper limit flow rate of one of the hydrogen recirculation pumps, and the total outflow rate is less than or equal to the sum of the upper limit flow rates of all the hydrogen recirculation pumps, then the total second flow rate MF shall apply. total A reasonable allocation is made among multiple hydrogen circulation pumps, and the overall efficiency of each circulation pump under each allocation mode is calculated. Based on the allocation mode with the highest overall efficiency, the working flow rate is allocated to each of the third target circulation pumps. Each of the third target circulation pumps is then controlled to pump unconsumed fuel from other fuel cells into the main fuel supply pipeline according to its allocated working flow rate. The specific allocation modes are as follows:

[0103] Let: The first pressure of fuel cell 1 be equal to the first pressure of fuel cell 2, that is, P1 = P2 = (P1 request +P2 request ) / 2, the working flow rate of hydrogen circulation pump 1 is MF11 = MF1 max Calculate the energy consumption E11 of hydrogen circulation pump 1 at this time, and the operating flow rate MF21 of hydrogen circulation pump 2 = MF total -MF1 max Calculate the energy consumption E21 of hydrogen circulation pump 2 at this time. The overall efficiency at this time is η1 = MF. total / (E11+E21);

[0104] Let: The first pressure of fuel cell 1 be equal to the first pressure of fuel cell 2, that is, P1 = P2 = (P1 request +P2 request ) / 2, the working flow rate of hydrogen circulation pump 1 is MF12 = MF1 max -ΔMF, calculate the energy consumption E12 of hydrogen circulation pump 1 at this time, and the working flow rate of hydrogen circulation pump 2 MF22=MF total -MF1 max +ΔMF, calculate the energy consumption E22 of hydrogen circulation pump 2 at this time, and the overall efficiency η2 = MF. total / (E12+E22);

[0105] Let: The first pressure of fuel cell 1 be equal to the first pressure of fuel cell 2, that is, P1 = P2 = (P1 request +P2 request ) / 2, the operating flow rate of hydrogen circulation pump 1 is MF13 = MF1 max -2ΔMF, calculate the energy consumption E13 of hydrogen circulation pump 1 at this time, and the working flow rate of hydrogen circulation pump 2 MF23=MF total -MF1 max +2ΔMF, calculate the energy consumption E23 of hydrogen circulation pump 2 at this time, and the overall efficiency η3 = MF. total / (E13+E23); and so on.

[0106] Let: The first pressure of fuel cell 1 be equal to the first pressure of fuel cell 2, that is, P1 = P2 = (P1 request +P2 request ) / 2, the operating flow rate MF1 of hydrogen circulation pump 1 n =0, calculate the energy consumption E1 of hydrogen circulation pump 1 at this time. n The operating flow rate of hydrogen circulation pump 2 is MF2 n =MF total Calculate the energy consumption E2 of hydrogen circulation pump 2 at this time. n At this point, the overall efficiency η n =MF total / (E1 n +E2 n );

[0107] Let: etam=max(eta1, eta2, eta3...etan), when eta=etam, MF1=MF1 m MF2 = MF2 m By adjusting control valve K in -0 opening K in =K inm Make the working flow rate of hydrogen circulation pump 1 MF1 = MF1 m The working flow rate of hydrogen circulation pump 2 is MF2 = MF2 m The status of the control valves in each hydrogen circulation system is as follows: K in -0 opening degree: K in =K inm K out -0 opening degree: K out =K outm K in -1 Open, K in -2 Open, K out -1 Open, K out -2 Open.

[0108] To facilitate a better understanding of this application by those skilled in the art, two hydrogen fuel cell stacks will be used as examples below, combined with... Figures 3-5 This application will be illustrated with some specific embodiments.

[0109] Figure 5 A map of the operating efficiency of the circulating pump in some specific embodiments of this application is shown.

[0110] Example 1:

[0111] Two identical fuel cell modules, fuel cell stack 1 is in operation, and fuel cell stack 2 is in rest. The first pressure of fuel cell stack 1 is 260 kPa, the second pressure is 200 kPa, and the second flow rate is 30 m³ / s. 3 / h.

[0112] Using the control method of the fuel cell fuel circulation supply system of this application, hydrogen circulation pump 1 is selected to supply hydrogen to fuel cell stack 1. The operating pressure ratio of hydrogen circulation pump 1 is 1.3, and the operating flow rate is 30 m³ / s. 3 / h, then according to Figure 5 As shown in the efficiency map of the circulating pumps, the efficiency of hydrogen circulating pump 1 is 34%. Hydrogen circulating pump 2 is selected to supply hydrogen to fuel cell stack 1, and its efficiency is also 34%. Therefore, according to the control method of the fuel cell fuel circulation supply system of this application, when the efficiency is equal, hydrogen circulating pump 1 corresponding to the fuel cell stack 1 that is in operation is selected to supply hydrogen to fuel cell stack 1, so as to reduce the energy consumption of the fuel cell system.

[0113] Example 2:

[0114] Two identical fuel cell modules, fuel cell stack 1 and fuel cell stack 2, are both in operation. The first pressure of both stacks is 260 kPa, the second pressure is 200 kPa, and the second flow rate is 30 m³ / s. 3 / h.

[0115] Each fuel cell module's hydrogen circulation pump supplies hydrogen to its respective fuel cell stack. The operating pressure ratio of each hydrogen circulation pump is 1.3, and the operating flow rate is 30 m³ / s. 3 / h, then according to Figure 5 As shown in the efficiency map of the circulating pumps, the efficiency of each hydrogen circulating pump is 34%.

[0116] Using the control method of the fuel cell fuel circulation supply system of this application, if any one hydrogen circulation pump is shut down, and the other hydrogen circulation pump supplies the hydrogen circulation needs of the two fuel cell stacks, then the operating pressure ratio of the working hydrogen circulation pump is 1.3, and the operating flow rate is 60 m³ / s. 3 / h, then according to Figure 5 As shown in the efficiency map of the circulating pump, the efficiency of the hydrogen circulating pump is 40% at this time, which is an increase of 6%.

[0117] Example 3:

[0118] Two identical fuel cell modules, fuel cell stack 1 and fuel cell stack 2, are both in operation. The first pressure of fuel cell stack 1 is 240 kPa, the second pressure is 200 kPa, and the second flow rate is 20 m³ / s. 3 / h, the first pressure of fuel cell stack 2 is 260kPa, the second pressure is 200kPa, and the second flow rate is 30m³ / h. 3 / h.

[0119] Each fuel cell module's hydrogen circulation pump supplies hydrogen to its respective fuel cell stack. Hydrogen circulation pump 1 operates at a pressure ratio of 1.2 and a flow rate of 20 m³ / s. 3 / h, then according to Figure 5 The efficiency map of the circulating pumps shows that the efficiency of hydrogen circulating pump 1 is 30%, and the operating pressure ratio and flow rate of hydrogen circulating pump 2 at its operating point are 1.3 and 30 m³ / s, respectively. 3 / h, then according to Figure 5 As shown in the efficiency map of the circulating pump, the efficiency of hydrogen circulating pump 1 is 34%.

[0120] Using the control method of the fuel cell fuel circulation supply system of this application, the hydrogen circulation demand of each fuel cell stack is rationally distributed among multiple hydrogen circulation pumps. At this time, the first pressure of each fuel cell stack is 250 kPa, and the second pressure is 200 kPa. Figure 5 As shown in the efficiency map of the circulating pumps, the flow rates of both hydrogen circulating pump 1 and hydrogen circulating pump 2 are 25 m³ / s. 3 At a rate of / h, the combined efficiency of hydrogen circulation pump 1 and hydrogen circulation pump 2 is the highest.

[0121] In summary, the control method of the fuel cell fuel circulation supply system of this application can not only meet the fuel demand of each fuel cell system stack, but also improve the working efficiency of the circulation pump, and reduce the energy consumption of the fuel cell system to a certain extent.

[0122] The following describes an embodiment of the apparatus described in this application, which can be used to execute the control method for the fuel cell fuel cycle supply system of the second aspect of the above embodiments of this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the control method for the fuel cell fuel cycle supply system of the second aspect of this application described above.

[0123] Figure 6 A block diagram of the control device for a fuel cell fuel cycle supply system according to an embodiment of this application is shown.

[0124] like Figure 6 As shown, the control device 600 of the fuel cell fuel cycle supply system in this embodiment of the application includes: an acquisition unit 601, a determination unit 602, a first control unit 603, a calculation unit 604, and a second control unit 605.

[0125] The acquisition unit 601 is used to acquire the first flow rate and first pressure of the fuel inlet of each fuel cell stack, the second flow rate and second pressure of the fuel outlet of each fuel cell stack, and the upper limit pressure ratio and upper limit flow rate of the circulating pumps in each fuel circulation supply pipeline; the determination unit 602 is used to determine the operating point of each circulating pump in the circulating pump efficiency Map of each circulating pump based on the first flow rate, first pressure, second flow rate and second pressure of the target fuel cell stack if only one target fuel cell stack has a first flow rate greater than zero; the first control unit 603 is used to determine the operating efficiency, operating pressure ratio and operating flow rate of each circulating pump based on the operating point of each circulating pump, so as to determine the first target circulating pump from the circulating pumps based on the operating efficiency, operating pressure ratio and operating flow rate of each circulating pump, and control the first target circulating pump. A target circulation pump pumps unconsumed fuel from the target stack into the main fuel supply line; a calculation unit 604 is used to calculate the pressure difference between any one of the at least two stacks and the other stacks if the first flow rate corresponding to at least two stacks is greater than zero; a second control unit 605 is used to close the first and second control valves between the fuel circulation supply line of the target stack and the fuel circulation supply line of the other stacks if the pressure difference is greater than a set pressure difference threshold, so as to control the second target circulation pump in the fuel circulation supply line of the target stack to pump unconsumed fuel from the target stack into the main fuel supply line, and control the third target circulation pump in the fuel circulation supply line of the other stacks to pump unconsumed fuel from the other stacks into the main fuel supply line.

[0126] In some embodiments of this application, based on the foregoing scheme, the first control unit 603 is configured to: if the operating efficiency of the circulation pump in the fuel circulation supply pipeline where the target fuel stack is located is the highest, or the operating pressure ratio of the circulation pump in the fuel circulation supply pipeline where the target fuel stack is located is greater than the upper limit pressure ratio of the circulation pump in the fuel circulation supply pipeline where other fuel stacks are located, or the operating flow rate of the circulation pump in the fuel circulation supply pipeline where the target fuel stack is located is greater than the upper limit flow rate of the circulation pump in the fuel circulation supply pipeline where other fuel stacks are located, then the circulation pump in the fuel circulation supply pipeline where the target fuel stack is located is designated as the first target circulation pump.

[0127] In some embodiments of this application, based on the foregoing scheme, the first control unit 603 is further configured to: if the operating efficiency of the circulation pump in the fuel circulation supply pipeline of the fuel stack other than the target fuel stack is the highest, and the operating pressure ratio of the circulation pump in the fuel circulation supply pipeline of the target fuel stack is less than or equal to the upper limit pressure ratio of the circulation pump in the fuel circulation supply pipeline of the fuel stack other than the target fuel stack, and the workload of the circulation pump in the fuel circulation supply pipeline of the target fuel stack is less than or equal to the upper limit flow rate of the circulation pump in the fuel circulation supply pipeline of the fuel stack other than the target fuel stack, then the circulation pump with the highest operating efficiency among the circulation pumps in the fuel circulation supply pipeline of the fuel stack other than the target fuel stack is selected as the first target circulation pump.

[0128] In some embodiments of this application, based on the foregoing scheme, the first control unit 603 is further configured to: determine the operating parameters of the first target circulating pump based on the operating efficiency, operating pressure ratio, and operating flow rate of the first target circulating pump; and control the first target circulating pump to pump the unconsumed fuel in the target fuel stack into the main fuel supply pipeline according to the operating parameters.

[0129] In some embodiments of this application, based on the foregoing scheme, the second control unit 605 is configured to: calculate the second total flow rate of the fuel output ports of each of the other fuel cells; pre-allocate the working flow rate of each of the third target circulation pumps based on the second total flow rate according to different allocation modes, and calculate the overall efficiency of the third target circulation pumps under each allocation mode; allocate the working flow rate of each of the third target circulation pumps according to the allocation mode with the highest overall efficiency, and control each of the third target circulation pumps to pump the unconsumed fuel in the other fuel cells into the main fuel supply pipeline according to the allocated working flow rate.

[0130] In some embodiments of this application, based on the foregoing scheme, the second control unit 605 is further configured to: for each allocation mode, calculate the energy consumption of each of the third target circulating pumps based on the working flow rate allocated to each of the third target circulating pumps; and calculate the overall efficiency of the third target circulating pumps in each allocation mode based on the energy consumption of each of the third target circulating pumps and the sum of the second flow rates.

[0131] In some embodiments of this application, based on the foregoing scheme, the second control unit 605 is further configured to: calculate the sum of the upper limit flow rates of each of the third target circulation pumps; if the sum of the second flow rates is greater than the sum of the upper limit flow rates, then close the first control valve and the second control valve between any two fuel circulation supply lines of other fuel cells, so as to control each of the third target circulation pumps to pump the unconsumed fuel in the other fuel cells into the main fuel supply line according to their respective upper limit flow rates.

[0132] This application also provides a computer program product comprising computer instructions stored in a computer-readable storage medium and adapted to be read and executed by a processor to cause a computer device having the processor to perform a control method for a fuel cell fuel cycle supply system as described in any of the above embodiments.

[0133] This application also provides a computer-readable medium, which may be included in an electronic device or exist independently without being assembled into an electronic device. The computer-readable storage medium stores at least one line of program code, which is loaded and executed by a processor to implement the control method for the fuel cell fuel cycle supply system described in any of the above embodiments.

[0134] This application also provides an electronic device, which includes one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to implement the control method of the fuel cell fuel cycle supply system described in any of the above embodiments.

[0135] Figure 7 A schematic diagram of the structure of a computer system suitable for implementing the electronic device of the present application is shown.

[0136] It should be noted that, Figure 7 The computer system 700 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0137] like Figure 7As shown, the computer system 700 includes a Central Processing Unit (CPU) 701, which can perform various appropriate actions and processes based on programs stored in Read-Only Memory (ROM) 702 or programs loaded from storage portion 708 into Random Access Memory (RAM) 703, such as performing the methods described in the above embodiments. The RAM 703 also stores various programs and data required for system operation. The CPU 701, ROM 702, and RAM 703 are interconnected via a bus 704. An Input / Output (I / O) interface 705 is also connected to the bus 704.

[0138] The following components are connected to I / O interface 705: an input section 706 including a keyboard, mouse, etc.; an output section 707 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 708 including a hard disk, etc.; and a communication section 709 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to I / O interface 705 as needed. A removable medium 711, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 710 as needed so that computer programs read from it can be installed into storage section 708 as needed.

[0139] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 709, and / or installed from removable medium 711. When the computer program is executed by central processing unit (CPU) 701, it performs various functions defined in the system of this application.

[0140] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such transmitted data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0141] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0142] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0143] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0144] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, touch terminal, or network device, etc.) to execute the method according to the embodiments of this application.

[0145] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0146] It should be understood that this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A fuel cell fuel cycle supply system, characterized in that, The system includes: At least two fuel cells; A main fuel supply line, which is used to supply fuel to each fuel cell stack; At least two fuel circulation supply lines are provided, each corresponding to one of the fuel cell stacks. These lines are used to recover unconsumed fuel from the corresponding fuel cell stacks and to pump the unconsumed fuel into the main fuel supply line via circulation pumps installed in the fuel circulation supply lines. In this configuration, any two adjacent fuel circulation supply lines are connected by a first control valve and a second control valve. The two ends of the first control valve are respectively close to the inlet of the circulation pump in any two adjacent fuel circulation supply lines, and the two ends of the second control valve are respectively close to the outlet of the circulation pump in any two adjacent fuel circulation supply lines.

2. A control method for a fuel cell fuel cycle supply system, characterized in that, The method is applied to the fuel cell fuel cycle supply system as described in claim 1, and the method includes: The first flow rate and first pressure of the fuel inlet of each fuel cell stack are obtained, as well as the second flow rate and second pressure of the fuel outlet of each fuel cell stack, and the upper limit pressure ratio and upper limit flow rate of the circulation pump in each fuel circulation supply pipeline are obtained. If there is only one target fuel cell stack with a first flow rate greater than zero, then based on the first flow rate, first pressure, second flow rate and second pressure corresponding to the target fuel cell stack, the operating point corresponding to each circulating pump is determined in the circulating pump efficiency Map of each circulating pump. Based on the operating point of each circulating pump, the working efficiency, working pressure ratio, and working flow rate of each circulating pump are determined. Based on the working efficiency, working pressure ratio, and working flow rate of each circulating pump, a first target circulating pump is determined from the circulating pumps, and the first target circulating pump is controlled to pump the unconsumed fuel in the target fuel stack into the main fuel supply pipeline. If there are at least two electric stacks with a first flow rate greater than zero, then calculate the pressure difference between any one of the at least two electric stacks and the other electric stacks. If the pressure difference value is greater than the set pressure difference threshold, the first and second control valves between the fuel circulation supply line of any one fuel cell stack and the fuel circulation supply line of the other fuel cell stacks are closed. This controls the second target circulation pump in the fuel circulation supply line of any one fuel cell stack to pump the unconsumed fuel in the one fuel cell stack into the main fuel supply line, and controls the third target circulation pump in the fuel circulation supply line of the other fuel cell stacks to pump the unconsumed fuel in the other fuel cell stacks into the main fuel supply line.

3. The method according to claim 2, characterized in that, The process of determining the first target circulating pump from among the circulating pumps based on their operating efficiency, operating pressure ratio, and operating flow rate includes: If the circulation pump in the fuel circulation supply line where the target fuel cell stack is located has the highest operating efficiency, or the operating pressure ratio of the circulation pump in the fuel circulation supply line where the target fuel cell stack is located is greater than the upper limit pressure ratio of the circulation pump in the fuel circulation supply line where other fuel cell stacks are located, or the operating flow rate of the circulation pump in the fuel circulation supply line where the target fuel cell stack is located is greater than the upper limit flow rate of the circulation pump in the fuel circulation supply line where other fuel cell stacks are located, then the circulation pump in the fuel circulation supply line where the target fuel cell stack is located is designated as the first target circulation pump.

4. The method according to claim 3, characterized in that, The method further includes: If the circulation pump in the fuel circulation supply line of a fuel cell stack other than the target fuel cell stack has the highest operating efficiency, and the operating pressure ratio of the circulation pump in the fuel circulation supply line of the target fuel cell stack is less than or equal to the upper limit pressure ratio of the circulation pump in the fuel circulation supply line of a fuel cell stack other than the target fuel cell stack, and the working capacity of the circulation pump in the fuel circulation supply line of the target fuel cell stack is less than or equal to the upper limit flow rate of the circulation pump in the fuel circulation supply line of a fuel cell stack other than the target fuel cell stack, then the circulation pump with the highest operating efficiency in the fuel circulation supply line of the fuel cell stack other than the target fuel cell stack is selected as the first target circulation pump.

5. The method according to claim 2, characterized in that, The control of the first target circulation pump to pump unconsumed fuel from the target fuel cell stack into the main fuel supply line includes: Based on the working efficiency, working pressure ratio, and working flow rate of the first target circulating pump, the operating parameters of the first target circulating pump are determined. The first target circulation pump is controlled to pump the unconsumed fuel in the target fuel stack into the main fuel supply pipeline according to the operating parameters.

6. The method according to claim 2, characterized in that, The third target circulation pump in the fuel circulation supply line of the other fuel cells pumps unconsumed fuel from the other fuel cells into the main fuel supply line, including: Calculate the sum of the second flow rates at the fuel outlets of each of the other fuel cells; According to different allocation modes, the working flow of each of the third target circulating pumps is pre-allocated based on the second total flow, and the overall efficiency of the third target circulating pumps under each allocation mode is calculated; According to the allocation mode with the highest overall efficiency, the working flow rate is allocated to each of the third target circulation pumps, and each of the third target circulation pumps is controlled to pump the unconsumed fuel in the other fuel stacks into the main fuel supply pipeline according to the allocated working flow rate.

7. The method according to claim 6, characterized in that, The calculation of the overall efficiency of the third target circulating pump under each allocation mode includes: For each allocation mode, the energy consumption of each of the third target circulation pumps is calculated based on the working flow rate allocated to each of the third target circulation pumps. Based on the energy consumption of each of the third target circulation pumps and the sum of the second flow rates, the overall efficiency of the third target circulation pumps in each distribution mode is calculated.

8. The method according to claim 6, characterized in that, The method further includes: Calculate the sum of the upper limit flow rates of each of the aforementioned third target circulating pumps; If the second total flow rate is greater than the upper limit total flow rate, then the first and second control valves between any two other fuel cell stacks in the fuel circulation supply line are closed, so as to control each of the third target circulation pumps to pump the unconsumed fuel in the other fuel cell stacks into the main fuel supply line according to their respective upper limit flow rates.

9. A control device for a fuel cell fuel cycle supply system, characterized in that, The device includes: The acquisition unit is used to acquire the first flow rate and first pressure of the fuel inlet of each fuel cell stack, the second flow rate and second pressure of the fuel outlet of each fuel cell stack, and the upper limit pressure ratio and upper limit flow rate of the circulation pump in each fuel circulation supply pipeline. The determining unit is used to determine the operating point of each circulating pump in the circulating pump efficiency Map of each circulating pump if there is only one target fuel cell corresponding to a first flow rate greater than zero. The first control unit is used to determine the working efficiency, working pressure ratio, and working flow rate of each circulating pump based on the corresponding operating point of each circulating pump. Based on the working efficiency, working pressure ratio, and working flow rate of each circulating pump, the first target circulating pump is determined from the circulating pumps, and the first target circulating pump is controlled to pump the unconsumed fuel in the target fuel stack into the main fuel supply pipeline. The calculation unit is used to calculate the pressure difference between any one of the at least two electric stacks and the other electric stacks if there are at least two electric stacks with a first flow rate greater than zero. The second control unit is used to close the first and second control valves between the fuel circulation supply line of any one fuel cell stack and the fuel circulation supply line of the other fuel cell stacks if the pressure difference value is greater than a set pressure difference threshold. This is to control the second target circulation pump in the fuel circulation supply line of any one fuel cell stack to pump unconsumed fuel from that fuel cell stack into the main fuel supply line, and to control the third target circulation pump in the fuel circulation supply line of the other fuel cell stacks to pump unconsumed fuel from the other fuel cell stacks into the main fuel supply line.

10. An electronic device, characterized in that, The electronic device includes one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to implement the control method of the fuel cell fuel cycle supply system as described in any one of claims 2 to 8.

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