Fuel cell system control method, device and equipment

Abstract

The embodiment of the invention discloses a fuel cell system control method, device and equipment, and the method comprises the steps: determining the icing state of a nitrogen discharge valve according to the pressure difference between an inlet and an outlet of an electric pile, and controlling to increase the opening and closing frequency of a drain valve when the nitrogen discharge valve is determined to be in the icing state, so that after the drain valve discharges liquid, gas can be discharged, and the safety of a fuel cell system is improved. The function of discharging gas by the nitrogen discharging valve is realized through the water discharging valve, so that the normal circulation process of the gas of the fuel cell system is ensured. According to the technical scheme provided by the invention, the fuel cell system can still work normally even if the nitrogen discharge valve fails to discharge nitrogen due to freezing, so that the reliability of the fuel cell system is ensured. Moreover, according to the technical scheme of the embodiment, hardware heating equipment does not need to be added, and the problems of high cost, low reliability and high risk caused by adding the heating equipment can be avoided.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of fuel cell systems, and in particular, to a fuel cell system control method, device, and equipment. Background Art

[0002] With the widespread use of new energy vehicles, the reliability requirements for fuel cell systems are becoming increasingly higher.

[0003] In the fuel cell system, the gas supplied to the anode circuit of the stack is hydrogen. In order to ensure the life of the fuel cell system, the hydrogen circulation pump must be kept in normal working condition. However, under low-temperature operation, the nitrogen exhaust valve at the bottom of the hydrogen circulation pump is prone to water accumulation and icing, resulting in a decrease in the performance of the hydrogen pump. At the same time, due to the failure of the system's nitrogen exhaust function, the stack will be short of hydrogen and the fuel cell system will shut down. Summary of the invention

[0004] The present invention provides a fuel cell system control method, device and equipment to detect the freezing state of a nitrogen exhaust valve, and discharge gas through a water discharge valve when the nitrogen exhaust valve is detected to be frozen, thereby ensuring that the fuel cell system can still operate normally when the nitrogen exhaust valve is frozen.

[0005] In a first aspect, an embodiment of the present invention provides a control method for a fuel cell system, wherein the fuel cell system includes a fuel cell stack, a gas-liquid separator, a hydrogen circulation pump, a water drain valve, and a nitrogen exhaust valve; the gas-liquid separator is connected between an outlet of the fuel cell stack and the hydrogen circulation pump, the water drain valve is connected to the gas-liquid separator, and the nitrogen exhaust valve is connected to the hydrogen circulation pump;

[0006] Control methods include:

[0007] Determine the freezing state of the nitrogen exhaust valve based on the pressure difference between the inlet and outlet of the stack;

[0008] When the freezing state is freezing, the opening and closing frequency of the drain valve is controlled to increase.

[0009] Optionally, when the freezing state is freezing, controlling to increase the opening and closing frequency of the drain valve includes:

[0010] When the freezing state is freezing, according to the first corresponding relationship, the opening and closing frequency of the drain valve is controlled to be greater than or equal to the opening and closing frequency of the nitrogen exhaust valve under the same control parameters;

[0011] The first corresponding relationship is the corresponding relationship between the control parameter and the opening and closing frequency of the nitrogen exhaust valve.

[0012] Optionally, when the freezing state is freezing, according to the first corresponding relationship, controlling the opening and closing frequency of the drain valve to be greater than or equal to the opening and closing frequency of the nitrogen exhaust valve under the same control parameters includes:

[0013] When the freezing state is freezing, according to the first corresponding relationship, under the condition that the opening and closing frequency of the drain valve is controlled to be greater than or equal to the opening and closing frequency of the nitrogen exhaust valve under the same control parameters, the opening time of the drain valve is controlled to be greater than or equal to the opening time of the nitrogen exhaust valve, and the closing time of the drain valve is less than or equal to the closing time of the nitrogen exhaust valve.

[0014] Optionally, the control parameter includes the current density of the fuel cell stack.

[0015] Optionally, after determining the freezing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the fuel cell stack, the method further includes:

[0016] When the freezing state is freezing, the opening and closing frequency of the nitrogen exhaust valve is controlled to remain unchanged under the same control parameters according to the first corresponding relationship.

[0017] Optionally, after determining the freezing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the fuel cell stack, the method further includes:

[0018] When the freezing state is not freezing, the opening and closing frequency of the nitrogen exhaust valve is controlled according to the first corresponding relationship, and the opening and closing frequency of the drain valve is controlled according to the second corresponding relationship, where the second corresponding relationship is the corresponding relationship between the control parameter and the opening and closing frequency of the drain valve;

[0019] According to the first corresponding relationship and the second corresponding relationship, the opening and closing frequency of the nitrogen exhaust valve corresponding to the same control parameters is greater than the opening and closing frequency of the water discharge valve.

[0020] Optionally, determining the freezing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the fuel cell stack includes:

[0021] When the nitrogen exhaust valve is opened, the pressure at the inlet and outlet of the fuel cell stack is detected, and the pressure difference at the inlet and outlet of the fuel cell stack is calculated;

[0022] When the pressure difference is less than or equal to the set pressure threshold for at least two consecutive times, the freezing state is determined to be freezing;

[0023] When the pressure difference is greater than the set pressure threshold at least once, it is determined that the icing state is not icing.

[0024] Optionally, when at least one pressure difference is greater than a set pressure threshold, determining that the icing state is not icing includes:

[0025] After the icing state is determined, when the pressure difference is greater than the set pressure threshold at least twice in a row, the icing state is determined to be non-icing.

[0026] Optionally, set the pressure threshold equal to 0.

[0027] In a second aspect, an embodiment of the present invention further provides a control device for a fuel cell system, the fuel cell system comprising a fuel cell stack, a gas-liquid separator, a hydrogen circulation pump, a water drain valve and a nitrogen exhaust valve; the gas-liquid separator is connected between the outlet of the fuel cell stack and the hydrogen circulation pump, the water drain valve is connected to the hydrogen circulation pump, and the nitrogen exhaust valve is connected to the hydrogen circulation pump;

[0028] The control device includes:

[0029] An icing state determination module, used to determine the icing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the fuel cell stack;

[0030] The control module is used for controlling and increasing the opening and closing frequency of the drain valve when the freezing state is freezing.

[0031] In a third aspect, an embodiment of the present invention further provides a control device for a fuel cell system, comprising:

[0032] one or more processors;

[0033] A storage device for storing one or more programs;

[0034] When one or more programs are executed by one or more processors, the one or more processors implement the method of the first aspect.

[0035] The fuel cell system control method, device and equipment of this embodiment determines the freezing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the stack, and when it is determined that the nitrogen exhaust valve is in a freezing state, controls to increase the opening and closing frequency of the drain valve, so that the drain valve can discharge gas after discharging the liquid, that is, the nitrogen exhaust valve discharges gas through the drain valve, thereby ensuring the normal circulation process of the gas in the fuel cell system. The technical solution of this embodiment ensures that even if the nitrogen exhaust valve fails to exhaust nitrogen due to freezing, the fuel cell system can still work normally, thereby ensuring the reliability of the fuel cell system. In addition, the technical solution of the present invention does not require the addition of hardware heating equipment, and can avoid the problems of high cost, low reliability and high risk caused by adding heating equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a structural schematic diagram of a fuel cell system provided by an embodiment of the present invention;

[0037] Figure 2 is a flow chart of a control method of a fuel cell system provided by an embodiment of the present invention;

[0038] Figure 3 is a flow chart of another fuel cell system control method provided by an embodiment of the present invention;

[0039] Figure 4is a flow chart of another fuel cell system control method provided by an embodiment of the present invention;

[0040] Figure 5 is a schematic structural diagram of a control device for a fuel cell system provided by an embodiment of the present invention;

[0041] Figure 6 It is a structural schematic diagram of a control device of a fuel cell system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] Figure 1 1 is a schematic diagram of the structure of a fuel cell system provided by an embodiment of the present invention, the fuel cell system includes a fuel cell stack 110, a gas-liquid separator 120, a hydrogen circulation pump 130, a water discharge valve 140 and a nitrogen discharge valve 150; the gas-liquid separator 120 is connected between the outlet of the fuel cell stack 110 and the hydrogen circulation pump 130, the water discharge valve 140 is connected to the gas-liquid separator 120, and the nitrogen discharge valve 150 is connected to the hydrogen circulation pump 130. Reference Figure 1 The hydrogen injection valve 160 is connected to the inlet of the fuel cell stack 110, and hydrogen enters the fuel cell stack 110 through the hydrogen injection valve 160. After a reaction occurs in the fuel cell stack 110, gas and liquid are discharged through the outlet of the fuel cell stack 110. The discharged gas and liquid are separated into gas and liquid by the gas-liquid separator 120, and the separated liquid is discharged through the drain valve 140. The separated gas enters the hydrogen circulation pump 130, and a part of the gas is discharged through the nitrogen exhaust valve 150, and the other part of the gas returns to the fuel cell stack 110 for circulation.

[0044] Figure 2 This is a flow chart of a control method for a fuel cell system provided by an embodiment of the present invention. The control method for the fuel cell system can be executed by a control device of the fuel cell system. The control method for the fuel cell system can be applied to diagnosing the freezing state of a nitrogen exhaust valve of the fuel cell system and ensuring the normal operation of the fuel cell system when the nitrogen exhaust valve is frozen. Figure 2 , the control method of the fuel cell system includes:

[0045] Step 210: Determine the freezing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the fuel cell stack.

[0046] Specifically, under normal operating conditions when the nitrogen exhaust valve is not frozen, the pressure at the inlet of the stack is greater than the pressure at the outlet of the stack, and the pressures at the inlet and outlet of the stack have a certain pressure difference. The inlet of the stack may be a hydrogen inlet, and the outlet of the stack may be a hydrogen outlet. When the nitrogen exhaust valve is frozen, the nitrogen exhaust valve cannot be opened normally, the exhaust function of the fuel cell system fails (the gas discharged by the nitrogen exhaust valve includes nitrogen, hydrogen and other gases), and the pressure at the inlet of the stack will be close to the pressure at the outlet of the stack. Accordingly, in this step, the freezing state of the nitrogen exhaust valve can be determined according to the pressure difference between the inlet and outlet of the stack, that is, whether the nitrogen exhaust valve is frozen can be determined according to the pressure difference between the inlet and outlet of the stack. Exemplarily, when the pressure difference at the inlet and outlet of the stack is less than or equal to the set pressure threshold, it is determined that the nitrogen exhaust valve is frozen; when the pressure difference at the inlet and outlet of the stack is greater than the set pressure threshold, it is determined that the nitrogen exhaust valve is not frozen.

[0047] Step 220: When the freezing state is freezing, control to increase the opening and closing frequency of the drain valve.

[0048] When it is determined that the nitrogen exhaust valve is in a frozen state, the opening and closing frequency of the drain valve is controlled to increase. In the prior art fuel cell system, the drain valve is only used to discharge liquid. However, the control method of the fuel cell system of this embodiment controls the opening and closing frequency of the drain valve to increase when it is determined that the nitrogen exhaust valve is in a frozen state, so that the drain valve can discharge gas after discharging the liquid, that is, the function of the nitrogen exhaust valve to discharge gas is realized through the drain valve, thereby ensuring the normal circulation process of the gas in the fuel cell system.

[0049] In the prior art, a heating device is added to the nitrogen exhaust valve to maintain a higher temperature at the nitrogen exhaust valve to avoid freezing of the nitrogen exhaust valve. Compared with the prior art, the fuel cell system control method of this embodiment does not need to add hardware equipment, which can reduce the cost of adding heating equipment and reduce the complexity of the fuel cell system; at the same time, it can avoid the problem of low reliability of the fuel system caused by the poor durability and high failure rate of the heating equipment; furthermore, it can avoid the risk of temperature increase due to the addition of heating equipment and explosion in the hydrogen circuit.

[0050] The fuel cell system control method of this embodiment determines the freezing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the stack, and when it is determined that the nitrogen exhaust valve is in a freezing state, controls to increase the opening and closing frequency of the drain valve, so that the drain valve can discharge gas after discharging the liquid, that is, the nitrogen exhaust valve discharges gas through the drain valve, thereby ensuring the normal circulation process of the gas in the fuel cell system. The technical solution of this embodiment ensures that even if the nitrogen exhaust valve fails to discharge nitrogen due to freezing, the fuel cell system can still work normally, thereby ensuring the reliability of the fuel cell system. In addition, the technical solution of this embodiment does not require the addition of hardware heating equipment, which can avoid the problems of high cost, low reliability and high risk caused by adding heating equipment.

[0051] Figure 3 is a flow chart of another fuel cell system control method provided by an embodiment of the present invention, referring to Figure 3 Optionally, the control method of the fuel cell system includes:

[0052] Step 310, determining the freezing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the fuel cell stack; this step is the same as the process of step 210 in the above embodiment, and will not be repeated here.

[0053] Step 320: When the freezing state is freezing, according to the first corresponding relationship, the opening and closing frequency of the drain valve is controlled to be greater than or equal to the opening and closing frequency of the nitrogen exhaust valve under the same control parameters.

[0054] The first corresponding relationship is the corresponding relationship between the control parameter and the opening and closing frequency of the nitrogen exhaust valve. The first corresponding relationship can be stored in advance.

[0055] Specifically, when the control parameters are determined, the opening and closing frequency corresponding to the nitrogen exhaust valve can be determined according to the first corresponding relationship, and then the opening and closing frequency of the drain valve is controlled to be greater than the opening and closing frequency corresponding to the nitrogen exhaust valve determined according to the first corresponding relationship, so that when it is determined that the nitrogen exhaust valve is frozen, the opening and closing frequency of the drain valve is higher, so that the drain valve can discharge gas after the drainage is completed. And when the freezing state is frozen, according to the first corresponding relationship, the opening and closing frequency of the drain valve is controlled to be greater than or equal to the opening and closing frequency of the nitrogen exhaust valve under the same control parameters, so that the drain valve can completely discharge the gas that was originally required to be discharged by the nitrogen exhaust valve, so that the fuel cell system can work normally.

[0056] Optionally, the above step 320 includes: when the freezing state is freezing, according to the first corresponding relationship, under the condition that the opening and closing frequency of the drain valve is controlled to be greater than or equal to the opening and closing frequency of the nitrogen exhaust valve under the same control parameters, the opening time of the drain valve is controlled to be greater than or equal to the opening time of the nitrogen exhaust valve, and the closing time of the drain valve is controlled to be less than or equal to the closing time of the nitrogen exhaust valve. In this way, under the premise that the opening and closing frequency of the drain valve is increased, the opening time of the drain valve is also longer, so that when the nitrogen exhaust valve is frozen, the drain valve can more fully discharge gases such as nitrogen, further ensuring that the fuel cell system can work normally and improving the reliability of the fuel cell system.

[0057] Optionally, the control parameter includes the current density of the fuel cell stack.

[0058] The greater the current density of the battery stack, the more gas is generated. Correspondingly, in the first corresponding relationship, the greater the current density of the battery stack, the higher the opening and closing frequency of the nitrogen exhaust valve.

[0059] Step 330: When the freezing state is freezing, the opening and closing frequency of the nitrogen exhaust valve is controlled to remain unchanged under the same control parameters according to the first corresponding relationship.

[0060] Specifically, when the nitrogen exhaust valve is frozen, the nitrogen exhaust valve cannot be operated at different opening and closing frequencies. When it is determined that the freezing state is freezing, the opening and closing frequency of the nitrogen exhaust valve under the same control parameters is still controlled according to the first corresponding relationship to remain unchanged, that is, the control strategy of the nitrogen exhaust valve remains unchanged, which makes the control strategy of the nitrogen exhaust valve simple, which is conducive to improving the execution speed of the fuel cell system control method.

[0061] Step 340: When the freezing state is not freezing, the opening and closing frequency of the nitrogen exhaust valve is controlled according to the first corresponding relationship, and the opening and closing frequency of the drain valve is controlled according to the second corresponding relationship, where the second corresponding relationship is the corresponding relationship between the control parameter and the opening and closing frequency of the drain valve.

[0062] According to the first corresponding relationship and the second corresponding relationship, the opening and closing frequency of the nitrogen exhaust valve corresponding to the same control parameters is greater than the opening and closing frequency of the water discharge valve.

[0063] The first corresponding relationship and the second corresponding relationship may both be stored in advance.

[0064] Table 1 is a table showing the opening and closing frequencies of the nitrogen exhaust valve and the drain valve at different current densities when the nitrogen exhaust valve is not frozen, and Table 2 is a table showing the opening and closing frequencies of the nitrogen exhaust valve and the drain valve at different current densities when the nitrogen exhaust valve is frozen.

[0065] Table 1

[0066] Electric density / (A / cm2) 0.1 0.2 0.3 … Nitrogen exhaust valve opening and closing frequency / s Open 0.5 Close 6 Open 0.5 Close 4 Open 0.5 Close 2 … Drain valve opening and closing frequency / s Open 1 Close 30 Open 1 Close 25 Open 1 Close 20 …

[0067] Table 2

[0068] Electric density / (A / cm2) 0.1 0.2 0.3 … Nitrogen exhaust valve opening and closing frequency / s Open 0.5 Close 6 Open 0.5 Close 4 Open 0.5 Close 2 … Drain valve opening and closing frequency / s Open 0.5 Close 6 Open 0.5 Close 4 Open 0.5 Close 2 …

[0069] Referring to Table 1 and Table 2, when the nitrogen exhaust valve is not frozen and the stack current density is the same, the opening and closing frequency of the drain valve is less than the opening and closing frequency of the nitrogen exhaust valve. Optionally, when the nitrogen exhaust valve is not frozen and the stack current density is the same, the opening and closing frequency of the drain valve is equal to the opening and closing frequency of the nitrogen exhaust valve.

[0070] In other optional embodiments of the present invention, when the nitrogen exhaust valve is in an iced state, under the condition of the same stack current density, the opening and closing frequency of the water exhaust valve is greater than the opening and closing frequency of the nitrogen exhaust valve.

[0071] Figure 4 is a flow chart of another fuel cell system control method provided by an embodiment of the present invention, referring to Figure 4 , the control method of the fuel cell system includes:

[0072] Step 410: When the nitrogen exhaust valve is opened, the pressure at the inlet and the pressure at the outlet of the fuel cell stack are detected, and the pressure difference at the inlet and the outlet of the fuel cell stack is calculated.

[0073] Combination Figure 1 , pressure sensors may be respectively provided at the inlet and outlet of the stack 110, wherein the pressure sensor at the inlet of the stack is the first pressure sensor 171, and the pressure sensor at the outlet of the stack is the second pressure sensor 172. The pressure at the inlet of the stack is detected by the pressure sensor at the inlet of the stack, and the pressure at the outlet of the stack is detected by the pressure sensor at the outlet of the stack, and then the difference between the pressure at the inlet of the stack and the pressure at the outlet of the stack is used as the pressure difference between the inlet and outlet of the stack.

[0074] Table 3 is a table showing the system operating time and the pressure difference at the inlet and outlet of the stack.

[0075] Table 3

[0076] System running time / s 1 5 9 … Stack inlet pressure / kpa 120 120 120 … Stack outlet pressure / kpa 105 110 120 … Stack inlet and outlet pressure difference / kpa 15 10 0 … Accumulated opening times of nitrogen exhaust valve 1 2 3 …

[0077] Referring to Table 3, each time the nitrogen exhaust valve is opened, the pressure at the inlet and outlet of the stack is tested once, and the corresponding pressure difference is obtained. Taking the situation shown in Table 3 as an example, when the system operation time is 1 second, the nitrogen exhaust valve is opened for the first time, and the pressure difference at the inlet and outlet of the stack is 15Kpa; when the system operation time is 5 seconds, the nitrogen exhaust valve is opened for the second time, and the pressure difference at the inlet and outlet of the stack is 10Kpa; when the system operation time is 9 seconds, the nitrogen exhaust valve is opened for the third time, and the pressure difference at the inlet and outlet of the stack is 0Kpa...

[0078] Step 420: When the pressure difference is less than or equal to the set pressure threshold for at least two consecutive times, determine that the freezing state is freezing.

[0079] As described above, in a normal state where the nitrogen exhaust valve is not frozen, there is a certain pressure difference at the inlet and outlet of the fuel cell stack. In this step, when the pressure difference is less than or equal to the set pressure threshold for at least two consecutive times, the freezing state is determined to be freezing, which can avoid the inaccurate judgment result caused by using a single pressure difference to judge the freezing state, and ensure the accuracy of the determined freezing state. In some optional embodiments of the present invention, when the pressure difference is less than or equal to the set pressure threshold for at least two consecutive times, the freezing state is determined to be freezing. Optionally, the pressure threshold is set to be equal to 0. In some optional embodiments of the present invention, when the pressure difference is equal to 0 for at least 5 consecutive times, the freezing state is determined to be freezing.

[0080] Step 430: When the pressure difference is greater than the set pressure threshold at least once, determine that the icing state is not icing.

[0081] When the pressure difference on at least one side is greater than the set pressure threshold, it indicates that the pressure at the inlet and outlet of the fuel cell stack is normal, and it is determined that the nitrogen exhaust valve is not frozen.

[0082] Step 440, when the freezing state is freezing, control to increase the opening and closing frequency of the drain valve; this step is the same as the process of step 220 in the above embodiment, and will not be repeated here.

[0083] An embodiment of the present invention further provides a control device for a fuel cell system, which is used to execute the control method for a fuel cell system of any of the above embodiments of the present invention. The control device for the fuel cell system can be implemented using software and / or hardware. Figure 5 is a schematic diagram of a control device for a fuel cell system provided by an embodiment of the present invention, with reference to Figure 5 , the control device of the fuel cell system comprises:

[0084] An icing state determination module 510 is used to determine the icing state of the nitrogen exhaust valve according to the pressure difference between the inlet and the outlet of the fuel cell stack;

[0085] The control module 520 is used to control and increase the opening and closing frequency of the drain valve when the freezing state is freezing.

[0086] The control device of the fuel cell system of this embodiment is used to execute the control method of the fuel cell system of any of the above embodiments of the present invention, and has the beneficial effects of the control method of the fuel cell system of any of the above embodiments of the present invention.

[0087] Figure 6 It is a structural schematic diagram of a control device of a fuel cell system provided in an embodiment of the present invention. Figure 6 A block diagram of an exemplary device 412 suitable for use in implementing embodiments of the present invention is shown. Figure 6 The device 412 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0088] like Figure 6 As shown, the device 412 is in the form of a general purpose device. The components of the device 412 may include, but are not limited to: one or more processors 416, a storage device 428, and a bus 418 that connects different system components (including the storage device 428 and the processor 416).

[0089] Bus 418 represents one or more of several types of bus structures, including a storage device bus or storage device controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. For example, these architectures include but are not limited to Industry Subversive Alliance (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus and Peripheral Component Interconnect (PCI) bus.

[0090] Device 412 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by device 412, including volatile and non-volatile media, removable and non-removable media.

[0091] Storage device 428 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 431 and / or cache memory 432. Device 412 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 434 may be used to read and write non-removable, non-volatile magnetic media ( Figure 6 not shown, usually called a "hard drive"). Although Figure 6 Not shown in the figure, a disk drive for reading and writing a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing a removable non-volatile optical disk, such as a read-only optical disk (Compact Disc Read-Only Memory, CD-ROM), a digital video disk (Digital Video Disc-Read Only Memory, DVD-ROM) or other optical media) may be provided. In these cases, each drive may be connected to the bus 418 via one or more data medium interfaces. The storage device 428 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present invention.

[0092] A program / utility 441 having a set (at least one) of program modules 442 may be stored, for example, in a storage device 428, such program modules 442 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. Program modules 442 generally perform the functions and / or methods of the embodiments described herein.

[0093] The device 412 may also communicate with one or more external devices 414 (e.g., a keyboard, a pointing terminal, a display 424, etc.), one or more terminals that enable a user to interact with the device 412, and / or any terminal that enables the device 412 to communicate with one or more other computing terminals (e.g., a network card, a modem, etc.). Such communication may be performed through an input / output (I / O) interface 422. Furthermore, the device 412 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 421. Figure 6 As shown, the network adapter 421 communicates with other modules of the device 412 via the bus 418. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the device 412, including but not limited to: microcode, terminal drivers, redundant processors, external disk drive arrays, disk arrays (Redundant Arrays of Independent Disks, RAID) systems, tape drives, and data backup storage systems.

[0094] The processor 416 executes various functional applications and data processing by running the program stored in the storage device 428, for example, implementing the control method of the fuel cell system provided in the embodiment of the present invention, the method comprising:

[0095] Determine the freezing state of the nitrogen exhaust valve based on the pressure difference between the inlet and outlet of the stack;

[0096] When the freezing state is freezing, the opening and closing frequency of the drain valve is controlled to increase.

[0097] The embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, a control method for a fuel cell system provided in the embodiment of the present invention is implemented. The method includes:

[0098] Determine the freezing state of the nitrogen exhaust valve based on the pressure difference between the inlet and outlet of the stack;

[0099] When the freezing state is freezing, the opening and closing frequency of the drain valve is controlled to increase.

[0100] The computer storage medium of the embodiment of the present invention can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0101] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0102] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0103] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or terminal. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0104] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control method for a fuel cell system, characterized in that: The fuel cell system comprises a fuel cell stack, a gas-liquid separator, a hydrogen circulation pump, a water drain valve and a nitrogen exhaust valve; the gas-liquid separator is connected between the outlet of the fuel cell stack and the hydrogen circulation pump, the water drain valve is connected to the gas-liquid separator, and the nitrogen exhaust valve is connected to the hydrogen circulation pump; The control method comprises: determining the icing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the fuel cell stack; When the freezing state is freezing, the opening and closing frequency of the drain valve is controlled to increase.

2. The control method of the fuel cell system according to claim 1, characterized in that: When the freezing state is freezing, controlling to increase the opening and closing frequency of the drain valve includes: When the freezing state is freezing, according to the first corresponding relationship, the opening and closing frequency of the drain valve is controlled to be greater than or equal to the opening and closing frequency of the nitrogen exhaust valve under the same control parameters; The first corresponding relationship is a corresponding relationship between the control parameter and the opening and closing frequency of the nitrogen exhaust valve.

3. The control method of the fuel cell system according to claim 2, characterized in that: When the freezing state is freezing, according to the first corresponding relationship, controlling the opening and closing frequency of the drain valve to be greater than or equal to the opening and closing frequency of the nitrogen exhaust valve under the same control parameters includes: When the freezing state is freezing, according to the first corresponding relationship, under the condition that the opening and closing frequency of the drain valve is controlled to be greater than or equal to the opening and closing frequency of the nitrogen exhaust valve under the same control parameters, the opening time of the drain valve is controlled to be greater than or equal to the opening time of the nitrogen exhaust valve, and the closing time of the drain valve is controlled to be less than or equal to the closing time of the nitrogen exhaust valve.

4. The control method of the fuel cell system according to claim 2, characterized in that: The control parameter includes the current density of the fuel cell stack.

5. The control method of the fuel cell system according to claim 2, characterized in that: After determining the freezing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the fuel cell stack, the method further includes: When the freezing state is freezing, the opening and closing frequency of the nitrogen exhaust valve is controlled to remain unchanged under the same control parameters according to the first corresponding relationship.

6. The control method of the fuel cell system according to claim 2, characterized in that: After determining the freezing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the fuel cell stack, the method further includes: When the freezing state is non-freezing, the opening and closing frequency of the nitrogen exhaust valve is controlled according to the first corresponding relationship, and the opening and closing frequency of the drain valve is controlled according to the second corresponding relationship, wherein the second corresponding relationship is a corresponding relationship between the control parameter and the opening and closing frequency of the drain valve; According to the first corresponding relationship and the second corresponding relationship, the opening and closing frequency of the nitrogen exhaust valve corresponding to the same control parameter is greater than the opening and closing frequency of the water drain valve.

7. The control method of the fuel cell system according to claim 1, characterized in that: The step of determining the icing state of the nitrogen exhaust valve according to the pressure difference at the inlet and the outlet of the fuel cell stack comprises: When the nitrogen exhaust valve is opened, the pressure at the inlet and the pressure at the outlet of the fuel cell stack are detected once, and the pressure difference at the inlet and the outlet of the fuel cell stack is calculated; When the pressure difference is less than or equal to a set pressure threshold at least twice in a row, determining that the freezing state is freezing; When the pressure difference is greater than the set pressure threshold at least once, it is determined that the icing state is not icing.

8. The control method of the fuel cell system according to claim 7, characterized in that: The set pressure threshold is equal to 0.

9. A control device for a fuel cell system, characterized in that: The fuel cell system comprises a fuel cell stack, a gas-liquid separator, a hydrogen circulation pump, a water drain valve and a nitrogen exhaust valve; the gas-liquid separator is connected between the outlet of the fuel cell stack and the hydrogen circulation pump, the water drain valve is connected to the hydrogen circulation pump, and the nitrogen exhaust valve is connected to the hydrogen circulation pump; The control device comprises: An icing state determination module, used to determine the icing state of the nitrogen exhaust valve according to the pressure difference at the inlet and outlet of the fuel cell stack; The control module is used for controlling and increasing the opening and closing frequency of the drain valve when the freezing state is freezing.

10. A control device for a fuel cell system, characterized in that: include: one or more processors; A storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 8.

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