Control method and device of fuel cell system and fuel cell system

Abstract

The invention provides a control method and device of a fuel cell system and the fuel cell system, and relates to the field of fuel cell system control. According to the method, when a hydrogen circulating pump in the fuel cell system is frozen in a low-temperature environment, a drain valve of the fuel cell system is controlled to execute opening and closing actions according to nitrogen removal valve control parameters; therefore, the opening and closing frequency of the drain valve is increased, the water discharge amount of the drain valve is increased, the water inlet amount of the hydrogen circulating pump is reduced, the icing condition of a nitrogen discharge valve in the hydrogen circulating pump is relieved, and finally deicing treatment on the hydrogen circulating pump is achieved. According to the method, heating equipment does not need to be additionally arranged, and the problems of poor durability and high failure rate of the fuel cell system due to the use of the heating equipment in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell system control, and in particular to a control method and device for a fuel cell system and a fuel cell system. Background Art

[0002] The gas supplied in the hydrogen circulation path of the fuel cell system is hydrogen, and the power source of the supply process is mainly the hydrogen circulation pump. In order to ensure the operation of the fuel cell system, it is necessary to ensure that the hydrogen circulation pump is in normal working conditions. In fact, in low temperature scenarios such as -30 degrees to 0 degrees, the valves of the hydrogen circulation pump are prone to water accumulation and freezing, causing the hydrogen circulation pump to fail to work normally. In severe cases, the fuel cell system will fail due to insufficient hydrogen supply.

[0003] The existing technology mainly solves the above problem by additionally setting up heating equipment to heat the hydrogen circulation pump when it is frozen. However, the additional heating equipment is not only dangerous to the fuel cell system, but also increases the cost and system complexity, and has problems of poor durability and high failure rate. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a control method and device for a fuel cell system and a fuel cell system. When a hydrogen circulation pump in the fuel cell system is in a low temperature environment and freezes, the method controls the drain valve of the fuel cell system to perform opening and closing actions according to the control parameters of the nitrogen exhaust valve, thereby increasing the opening and closing frequency of the drain valve, increasing the drainage volume of the drain valve, and then reducing the water intake of the hydrogen circulation pump, and finally realizing the deicing process; the method does not require additional heating equipment, and solves the problems of poor durability and high failure rate of the fuel cell system caused by the use of heating equipment in the prior art.

[0005] In a first aspect, an embodiment of the present invention provides a control method for a fuel cell system, the method being used to de-ice a hydrogen circulation pump in the fuel cell system; wherein an air inlet of the hydrogen circulation pump is connected to an air outlet of a water tank in the fuel cell system, a drain outlet of the water tank is connected to a preset drain outlet in the fuel cell system via a drain valve; an exhaust outlet of the hydrogen circulation pump is connected to a preset exhaust outlet in the fuel cell system via a nitrogen exhaust valve;

[0006] The method includes:

[0007] Under a preset first operating condition parameter, obtaining a first current value corresponding to a hydrogen circulation pump in the fuel cell system;

[0008] Calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold;

[0009] When the first duration is greater than a preset time threshold, a nitrogen exhaust valve control parameter of the fuel cell system under the first operating condition parameter is obtained, and the drain valve of the fuel cell system is controlled to perform an opening and closing action according to the nitrogen exhaust valve control parameter.

[0010] In one embodiment, under a preset first operating condition parameter, the step of obtaining a first current value corresponding to a hydrogen circulation pump in a fuel cell system includes:

[0011] Under the preset first operating condition parameters, an electric density parameter corresponding to the fuel cell stack and a speed parameter corresponding to the hydrogen circulation pump in the fuel cell system are obtained;

[0012] A plurality of reference groups are set using the electric density parameters and the speed parameters; wherein the corresponding electric density parameters and the speed parameters in the reference groups are set in a monotonically increasing order;

[0013] Under the corresponding electric density parameters and speed parameters in the reference group, the first current value of the hydrogen circulation pump corresponding to each reference group is obtained respectively.

[0014] In one embodiment, the step of calculating a first current difference between a first current value and a preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold, includes:

[0015] Determine the current calibration value corresponding to the electric density parameter and the speed parameter by using the reference group;

[0016] Real-time monitoring of a first current difference between a first current value corresponding to the reference group and a current calibration value, and determining whether the first current difference is greater than a preset difference threshold;

[0017] When the first current difference is greater than the difference threshold, timing starts, and a first duration during which the first current difference is greater than the difference threshold is acquired in real time.

[0018] In one embodiment, when the first duration is greater than a preset time threshold, the steps of obtaining a nitrogen exhaust valve control parameter of the fuel cell system under the first operating condition parameter, and controlling the drain valve of the fuel cell system to perform an opening and closing action according to the nitrogen exhaust valve control parameter include:

[0019] Determine in real time whether the first duration is greater than a time threshold;

[0020] If yes, then obtaining the nitrogen exhaust valve opening and closing frequency parameter included in the nitrogen exhaust valve control parameter under the first operating condition parameter;

[0021] After the drain valve opening and closing frequency parameter in the drain valve control parameter is set to use the nitrogen exhaust valve opening and closing frequency parameter, the drain valve is controlled to perform opening and closing actions according to the nitrogen exhaust valve control parameter.

[0022] In one embodiment, the drain valve opening and closing frequency parameter in the drain valve control parameter is set as the nitrogen exhaust valve opening and closing frequency parameter, including:

[0023] Obtain the drain valve opening time and drain valve closing time corresponding to the drain valve opening and closing frequency parameter under the first operating condition parameter;

[0024] Obtaining the nitrogen exhaust valve opening time and the nitrogen exhaust valve closing time corresponding to the nitrogen exhaust valve opening and closing frequency parameter under the first operating condition parameter;

[0025] If the drain valve opening time is longer than the nitrogen exhaust valve opening time and the drain valve closing time is longer than the nitrogen exhaust valve closing time, the drain valve opening and closing frequency parameter is set to use the nitrogen exhaust valve opening and closing frequency parameter.

[0026] In one embodiment, after the steps of calculating a first current difference between the first current value and the preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold, the method further comprises:

[0027] When the first duration is not greater than the time threshold, the drain valve control parameter of the fuel cell system is set to the drain valve control parameter corresponding to the first operating condition parameter.

[0028] In one embodiment, after controlling the drain valve of the fuel cell system to perform an opening and closing action according to the nitrogen exhaust valve control parameter, the method further includes:

[0029] updating in real time the electric density parameter corresponding to the battery stack and the speed parameter corresponding to the hydrogen circulation pump in the first operating condition parameter, and determining the electric density parameter and the speed parameter as the second operating condition parameter;

[0030] Obtaining a second current value corresponding to the hydrogen circulation pump under the second operating condition parameter, and calculating a second current difference between the second current value and a preset current calibration value;

[0031] If the second current difference is not greater than the difference threshold, the drain valve control parameter is set to the drain valve control parameter corresponding to the first operating condition parameter.

[0032] In one embodiment, after the step of obtaining a second current value corresponding to the hydrogen circulation pump under the second operating condition parameter and calculating a second current difference between the second current value and a preset current calibration value, the method further includes:

[0033] If the second current difference is greater than the difference threshold, obtaining a second duration during which the second current difference is greater than the difference threshold;

[0034] When the second duration is not greater than the time threshold, the drain valve control parameter is set to the drain valve control parameter corresponding to the first operating condition parameter.

[0035] In a second aspect, an embodiment of the present invention further provides a control device for a fuel cell system, the device being used to de-ice a hydrogen circulation pump in the fuel cell system; wherein an air inlet of the hydrogen circulation pump is connected to an air outlet of a water tank in the fuel cell system, a drain outlet of the water tank is connected to a preset drain outlet in the fuel cell system via a drain valve; an exhaust outlet of the hydrogen circulation pump is connected to a preset exhaust outlet in the fuel cell system via a nitrogen exhaust valve;

[0036] The device includes:

[0037] A first control module, used for obtaining a first current value corresponding to a hydrogen circulation pump in a fuel cell system under a preset first operating condition parameter;

[0038] a second control module, configured to calculate a first current difference between the first current value and a preset current calibration value, and obtain a first duration during which the first current difference is greater than a preset difference threshold;

[0039] The third control module is used to obtain the nitrogen exhaust valve control parameters of the fuel cell system under the first operating condition parameters when the first duration is greater than the preset time threshold, and control the drain valve of the fuel cell system to perform opening and closing actions according to the nitrogen exhaust valve control parameters.

[0040] In a third aspect, an embodiment of the present invention further provides a fuel cell system, which comprises at least a hydrogen circulation path and a fuel cell stack;

[0041] The hydrogen circulation path includes: a hydrogen circulation pump, a water tank, a drain valve, a nitrogen exhaust valve and a hydrogen spray valve; the hydrogen is input into the air inlet of the hydrogen spray valve, and the air outlet of the hydrogen spray valve is connected to the anode inlet of the fuel cell stack; the anode outlet of the fuel cell stack is connected to the inlet of the water tank; the drain outlet of the water tank is connected to the water inlet of the drain valve; the drain outlet of the drain valve is connected to the preset drain outlet of the fuel cell system; the air outlet of the water tank is connected to the air inlet of the hydrogen circulation pump; the exhaust outlet of the hydrogen circulation pump is connected to the preset exhaust outlet of the fuel cell system; the air outlet of the hydrogen circulation pump is connected to the anode inlet of the fuel cell stack;

[0042] When deicing the hydrogen circulation pump in the fuel cell system, the control method of the fuel cell system mentioned in the first aspect is adopted.

[0043] In a fourth aspect, an embodiment of the present invention further provides an electronic device, including a processor and a memory, wherein the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the steps of the fuel cell system control method provided in the first aspect.

[0044] In a fifth aspect, an embodiment of the present invention further provides a storage medium, which stores computer executable instructions. When the computer executable instructions are called and executed by a processor, the computer executable instructions prompt the processor to implement the steps of the fuel cell system control method provided in the first aspect.

[0045] A control method, device and fuel cell system of a fuel cell system provided in an embodiment of the present invention are used to de-ice a hydrogen circulation pump in a fuel cell system. The air inlet of the hydrogen circulation pump is connected to the air outlet of a water tank in the fuel cell system, and the drain outlet of the water tank is connected to the preset drain outlet in the fuel cell system through a drain valve; the exhaust port of the hydrogen circulation pump is connected to the preset exhaust port in the fuel cell system through a nitrogen exhaust valve. In the specific implementation process, firstly, under the preset first operating condition parameter, the first current value corresponding to the hydrogen circulation pump in the fuel cell system is obtained; then the first current difference between the first current value and the preset current calibration value is calculated, and the first duration of the first current difference greater than the preset difference threshold is obtained; when the first duration is greater than the preset time threshold, the nitrogen exhaust valve control parameter of the fuel cell system under the first operating condition parameter is obtained, and the drain valve of the fuel cell system is controlled to perform an opening and closing action according to the nitrogen exhaust valve control parameter. After the drain valve control parameter is set as the nitrogen exhaust valve control parameter, the opening and closing frequency of the drain valve is increased, thereby increasing the drainage volume of the drain valve, thereby reducing the water intake of the hydrogen circulation pump, alleviating the freezing of the nitrogen exhaust valve in the hydrogen circulation pump, and finally achieving the deicing of the hydrogen circulation pump. When the hydrogen circulation pump in the fuel cell system is in a low temperature environment and freezes, the method controls the drain valve of the fuel cell system to perform opening and closing actions according to the nitrogen exhaust valve control parameter, thereby increasing the opening and closing frequency of the drain valve, increasing the drainage volume of the drain valve, thereby reducing the water intake of the hydrogen circulation pump, and finally achieving the deicing process; the method does not require additional heating equipment, thereby solving the problem of poor durability and high failure rate of the fuel cell system caused by the use of heating equipment in the prior art.

[0046] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A flow chart of a first fuel cell system control method provided by an embodiment of the present invention;

[0050] Figure 2 A flowchart of step S101 in a fuel cell system control method provided by an embodiment of the present invention;

[0051] Figure 3 A flowchart of step S102 in a control method of a fuel cell system provided in an embodiment of the present invention;

[0052] Figure 4 A flowchart of step S103 in a fuel cell system control method provided by an embodiment of the present invention;

[0053] Figure 5 A flowchart of step S403 in a fuel cell system control method provided by an embodiment of the present invention;

[0054] Figure 6 A flow chart of a second fuel cell system control method provided by an embodiment of the present invention;

[0055] Figure 7 A flowchart after step S103 in a control method for a fuel cell system provided by an embodiment of the present invention;

[0056] Figure 8 A flowchart after step S702 in a control method for a fuel cell system provided by an embodiment of the present invention;

[0057] Fig. 9 A schematic structural diagram of a control device for a first fuel cell system provided by an embodiment of the present invention;

[0058] Fig.10 A schematic diagram of the structure of a control device for a second fuel cell system provided by an embodiment of the present invention;

[0059] Fig.11 A schematic structural diagram of a control device for a third fuel cell system provided by an embodiment of the present invention;

[0060] Fig.12 A schematic structural diagram of a fuel cell system provided by an embodiment of the present invention;

[0061] Fig.13 A schematic structural diagram of an electronic device provided by an embodiment of the present invention.

[0062] icon:

[0063] 910 - first control module; 920 - second control module; 930 - third control module; 940 - fourth control device; 950 - fifth control device;

[0064] 1210-fuel cell stack; 1220-hydrogen circulation pump; 1230-water tank; 1240-drain valve; 1250-nitrogen exhaust valve; 1260-hydrogen injection valve;

[0065] 101 - processor; 102 - memory; 103 - bus; 104 - communication interface. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described in combination with the embodiments below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] The gas supplied in the hydrogen circulation path of the fuel cell system is hydrogen, and the power source of the supply process is mainly the hydrogen circulation pump. In order to ensure the operation of the fuel cell system, it is necessary to ensure that the hydrogen circulation pump is in normal working conditions. In fact, in low temperature scenarios of -30 degrees to 0 degrees, the valves of the hydrogen circulation pump are prone to water accumulation and freezing, causing the hydrogen circulation pump to fail to work normally. In severe cases, the fuel cell system will fail and shut down due to insufficient hydrogen supply.

[0068] The prior art mainly solves the above problem by additionally setting up a heating device to heat the hydrogen circulation pump when it is frozen. However, the additionally set up heating device is not only dangerous to the fuel cell system, but also increases the cost and system complexity, and has problems of poor durability and high failure rate. Based on this, the present invention provides a control method, device and fuel cell system of a fuel cell system. When the hydrogen circulation pump in the fuel cell system is frozen in a low temperature environment, the deicing process can be completed by only using the drain valve control parameters of the fuel cell system, without the need for additionally setting up a heating device, thereby solving the problem of poor durability and high failure rate of the fuel cell system caused by the use of heating equipment in the prior art.

[0069] To facilitate understanding of this embodiment, a control method for a fuel cell system disclosed in an embodiment of the present invention is first introduced in detail, and the method is used to de-ice a hydrogen circulation pump in a fuel cell system. Generally speaking, the fuel cell system at least includes a hydrogen circulation path and a fuel cell stack; wherein the hydrogen circulation path includes: a hydrogen circulation pump, a water tank, a drain valve, a nitrogen exhaust valve, and a hydrogen spray valve; the inlet end of the hydrogen spray valve inputs hydrogen, and the outlet end of the hydrogen spray valve is connected to the anode inlet of the fuel cell stack; the anode outlet of the fuel cell stack is connected to the inlet of the water tank; the drain port of the water tank is connected to the water inlet of the drain valve; the drain port of the drain valve is connected to the preset drain port of the fuel cell system; the outlet of the water tank is connected to the inlet of the hydrogen circulation pump; the exhaust port of the hydrogen circulation pump is connected to the preset exhaust port of the fuel cell system through the nitrogen exhaust valve; the outlet of the hydrogen circulation pump is connected to the anode inlet of the fuel cell stack.

[0070] On this basis, the control method of the fuel cell system is as follows: Figure 1 As shown, including:

[0071] Step S101, under a preset first operating condition parameter, a first current value corresponding to a hydrogen circulation pump in a fuel cell system is obtained.

[0072] Under the first operating condition parameters, the hydrogen injection valve in the fuel cell system controls the hydrogen to be input into the hydrogen circulation path and finally input into the fuel cell stack for power generation. The fuel cell stack performs the power generation process under the first operating condition parameters and discharges the generated wastewater and waste gas into the water tank. The function of the water tank is to separate gas and liquid, and the separated wastewater is discharged through the drain valve connected to the water tank; the separated waste gas is transmitted to the hydrogen circulation pump for circulation. It is worth mentioning that the waste gas will be discharged through the nitrogen exhaust valve connected to the hydrogen circulation pump, and the main function of the hydrogen circulation pump is to circulate hydrogen, so it will enter the circulation working state under the first operating condition parameters, and the parameter for measuring the working state of the hydrogen circulation pump is its corresponding first current value.

[0073] Step S102, calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration that the first current difference is greater than a preset difference threshold.

[0074] After the first current value is obtained, it can be determined whether it is in a low temperature state according to its size. Specifically, when the hydrogen circulation pump is in a low temperature state, the corresponding current value is different from the current value in the normal working state, so the current value corresponding to different low temperatures can be used as the current calibration value according to the demand, and the difference between the first current value and the current calibration value is calculated to determine whether the hydrogen circulation pump is in a low temperature state. In the actual scene, the first current value obtained in real time may fluctuate in a specific scene, resulting in an abnormally low value, so it is necessary to judge its duration to avoid such errors. Specifically, after obtaining the first current difference between the first current value and the current calibration value, the size of the first current difference is judged. When the first current difference is greater than the difference threshold, it indicates that the hydrogen circulation pump is in an abnormal state. At this time, the first duration of the first current difference greater than the difference threshold is obtained to determine whether the hydrogen circulation pump is in a low temperature state.

[0075] Step S103, when the first duration is greater than a preset time threshold, obtaining a nitrogen exhaust valve control parameter of the fuel cell system under the first operating condition parameter, and controlling the drain valve of the fuel cell system to perform an opening and closing action according to the nitrogen exhaust valve control parameter.

[0076] If the first duration is longer than the preset time threshold, it indicates that the hydrogen circulation pump is in a low temperature state, indicating that under the drain valve control parameters of the first operating condition parameters, the opening and closing frequency of the drain valve is low, resulting in more wastewater entering the hydrogen circulation pump, and in most cases, the opening and closing frequency of the nitrogen exhaust valve is much higher than the opening and closing frequency of the drain valve. Therefore, when the hydrogen circulation pump is in a low temperature state, the drain valve control parameters of the fuel cell system under the current first operating condition parameters are set to the nitrogen exhaust valve control parameters, and the drain valve of the fuel cell system is controlled to perform opening and closing actions according to the nitrogen exhaust valve control parameters, so that the opening and closing frequency of the drain valve is increased, more wastewater is discharged, and less wastewater enters the circulation path of the hydrogen circulation pump, thereby alleviating the icing situation and completing deicing.

[0077] In one embodiment, under a preset first operating condition parameter, step S101 of obtaining a first current value corresponding to a hydrogen circulation pump in a fuel cell system is as follows: Figure 2 As shown, including:

[0078] Step S201, obtaining a power density parameter corresponding to a fuel cell stack and a speed parameter corresponding to a hydrogen circulation pump in a fuel cell system under a preset first operating condition parameter;

[0079] Step S202, using the power density parameters and the speed parameters to set a plurality of reference groups; wherein the corresponding power density parameters and the speed parameters in the reference groups are set in a monotonically increasing order;

[0080] Step S203, respectively obtaining the first current value of the hydrogen circulation pump corresponding to each reference group under the corresponding electric density parameter and speed parameter in the reference group.

[0081] Specifically, the first operating condition parameter at least includes the electric density parameter corresponding to the fuel cell stack and the speed parameter corresponding to the hydrogen circulation pump. After collecting the electric density parameter and the speed parameter, the corresponding reference group is set according to their respective numerical values. The electric density parameter and the speed parameter are set in a monotonically increasing order, and then the first current value corresponding to the hydrogen circulation pump is obtained according to the electric density parameter and the speed parameter in each reference group. Specifically, the electric density parameter, the speed parameter and the corresponding first current value in the reference group can be obtained by referring to Table 1.

[0082] Electrical density parameter / (A / cm2) 0.1 0.2 0.3 … Speed ​​parameter / rpm 1000 2000 3000 … First current value / A Measured value 1 Measured value 2 Measured value 3 …

[0083] Table 1

[0084] In one embodiment, the step S102 of calculating a first current difference between the first current value and the preset current calibration value and obtaining a first duration of time during which the first current difference is greater than a preset difference threshold value is as follows: Figure 3 As shown, including:

[0085] Step S301, using a reference group to determine a current calibration value corresponding to an electric density parameter and a speed parameter;

[0086] Step S302, real-time monitoring of a first current difference between a first current value corresponding to the reference group and a current calibration value, and determining whether the first current difference is greater than a preset difference threshold;

[0087] Step S303, when the first current difference is greater than the difference threshold, start timing, and obtain in real time a first duration during which the first current difference is greater than the difference threshold.

[0088] The operating parameters between the current calibration value and the first current value are the same. For example, the first current value is obtained according to the electric density parameters and speed parameters in Table 1, so the current calibration value is also obtained according to the electric density parameters and speed parameters in Table 1. At this time, the current calibration value can obtain the corresponding calibration relationship through the electric density parameters and speed parameters corresponding to the fuel cell stack when it is running at various electric densities, as shown in Table 2.

[0089] Electrical density parameter / (A / cm2) 0.1 0.2 0.3 … Speed ​​parameter / rpm 1000 2000 3000 … Current rating / A Calibration value 1 Calibration value 2 Calibration value 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 30 Open 1 Close 30 …

[0090] Table 2

[0091] The data in Table 2 represent the corresponding relationship between the speed parameters of the hydrogen circulation pump and the working current of the fuel cell stack at various operating points in the normal state. In actual processing, the data in Table 2 can be saved to the relevant storage unit of the fuel cell system for retrieval and use at any time.

[0092] The electric density parameters and speed parameters in Table 2 are consistent with those in Table 1, so the corresponding current calibration value can correspond to the first current value, by calculating the first current difference between the first current value and the current calibration value, and judging whether the first current difference is greater than the preset difference threshold. In the actual calculation process, the first current difference may be negative, in which case it needs to be converted into a positive number, and the absolute value of the first current difference is used to compare with the difference threshold.

[0093] When the current difference is greater than the difference threshold, the timing starts, and the duration is recorded as the first duration. The subsequent steps determine whether the hydrogen circulation pump is in a frozen state by the first duration. Specifically, in one embodiment, when the first duration is greater than the preset time threshold, the nitrogen exhaust valve control parameter of the fuel cell system under the first operating condition parameter is obtained, and the drain valve of the fuel cell system is controlled to perform the opening and closing action according to the nitrogen exhaust valve control parameter in step S103, such as Figure 4 As shown, including:

[0094] Step S401, determining in real time whether the first duration is greater than a time threshold;

[0095] Step S402: if yes, obtaining the nitrogen exhaust valve opening and closing frequency parameter included in the nitrogen exhaust valve control parameter under the first operating condition parameter;

[0096] Step S403, after setting the drain valve opening and closing frequency parameter in the drain valve control parameter to use the nitrogen exhaust valve opening and closing frequency parameter, control the drain valve to perform opening and closing actions according to the nitrogen exhaust valve control parameter.

[0097] According to the first operating condition parameters in the aforementioned embodiment, the above process can be understood and described with reference to the current difference in Table 3.

[0098] Electrical density parameter / (A / cm2) 0.1 0.2 0.3 … Speed ​​parameter / rpm 1000 2000 3000 … First current difference / A Measured value 1 - Calibration value 1 Measured value 2 - Calibrated value 2 Measured value 3 - Calibrated value 3 …

[0099] Table 3

[0100] The first current difference is the absolute value of the difference between the actual measured value corresponding to the first current value and the current calibration value. When the first current difference is greater than the difference threshold, it is determined whether the corresponding first duration is greater than the preset time threshold. If so, it is determined that the nitrogen exhaust valve of the bottom valve of the hydrogen circulation pump is frozen. In a specific scenario, when it is monitored that the first current difference is greater than 0.1A and the duration is greater than 5s, it is considered that the nitrogen exhaust valve of the hydrogen circulation pump is frozen.

[0101] When it is determined that water has accumulated and frozen in the nitrogen exhaust valve of the hydrogen circulation pump, the drain valve opening and closing frequency parameter in the drain valve control parameter is set to the nitrogen exhaust valve opening and closing frequency parameter, so that the opening and closing frequency of the drain valve is increased, more waste water is discharged, and less waste water enters the circulation path of the hydrogen circulation pump, thereby alleviating the freezing situation and completing de-icing.

[0102] In one embodiment, the drain valve opening and closing frequency parameter in the drain valve control parameter is set to use the nitrogen exhaust valve opening and closing frequency parameter, such as Figure 5 As shown, including:

[0103] Step S501, obtaining the drain valve opening time and drain valve closing time corresponding to the drain valve opening and closing frequency parameter under the first working condition parameter;

[0104] Step S502, obtaining the nitrogen exhaust valve opening time and the nitrogen exhaust valve closing time corresponding to the nitrogen exhaust valve opening and closing frequency parameter under the first operating condition parameter;

[0105] Step S503: if the drain valve opening time is longer than the nitrogen exhaust valve opening time and the drain valve closing time is longer than the nitrogen exhaust valve closing time, the drain valve opening and closing frequency parameter is set to use the nitrogen exhaust valve opening and closing frequency parameter.

[0106] Specifically, the nitrogen exhaust valve control parameters and the water discharge valve control parameters under the first operating condition parameters can be obtained through the first operating condition parameters pre-calibrated in Table 2, and the details can be referred to Table 4.

[0107] 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 30 Open 1 Close 30 …

[0108] Table 4

[0109] From the nitrogen exhaust valve control parameters and drain valve control parameters in Table 4, it can be seen that the drain valve opening and closing frequency is low, causing more wastewater to enter the hydrogen circulation pump. After setting the drain valve opening and closing frequency parameter in the drain valve control parameter to the nitrogen exhaust valve opening and closing frequency parameter, the drain valve opening and closing frequency is increased, more wastewater is discharged, and the wastewater entering the circulation path of the hydrogen circulation pump is reduced, thereby alleviating the icing situation and completing deicing. The adjusted drain valve control parameters are shown in Table 5.

[0110] 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 …

[0111] Table 5

[0112] The adjusted opening and closing frequency of the drain valve is the same as that of the nitrogen exhaust valve, so that the opening and closing frequency of the drain valve is increased, more wastewater can be discharged, and the amount of wastewater entering the circulation path of the hydrogen circulation pump is reduced, thereby alleviating the icing situation and completing de-icing.

[0113] In one embodiment, Figure 6It can be seen from the flowchart of the second fuel cell system control method shown that the method includes the following steps:

[0114] Step S601, obtaining a first current value corresponding to a hydrogen circulation pump in a fuel cell system under a preset first operating condition parameter;

[0115] Step S602, calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold;

[0116] Step S603: when the first duration is not greater than the time threshold, the drain valve control parameter of the fuel cell system is set to the drain valve control parameter corresponding to the first operating condition parameter.

[0117] In actual scenarios, the first current value acquired in real time may fluctuate in a specific scenario, resulting in an abnormally low value, and the first duration at this time will not be greater than the time threshold. Therefore, when it is monitored that the first duration is not greater than the time threshold, there is no need to set the drain valve control parameter of the fuel cell system to the nitrogen exhaust valve control parameter, and only the drain valve control parameter of the fuel cell system needs to be set to the corresponding drain valve control parameter under the first operating condition parameter.

[0118] After the drain valve control parameter of the fuel cell system is set to the nitrogen exhaust valve control parameter, the relevant deicing process is executed, and the deicing process ends after certain conditions are met. In one embodiment, after the drain valve of the fuel cell system is controlled to perform an opening and closing action according to the nitrogen exhaust valve control parameter, such as Figure 7 As shown, the method also includes:

[0119] Step S701, updating in real time the electric density parameter corresponding to the fuel cell stack and the speed parameter corresponding to the hydrogen circulation pump in the first operating condition parameter, and determining the electric density parameter and the speed parameter as the second operating condition parameter;

[0120] Step S702, obtaining a second current value corresponding to the hydrogen circulation pump under a second operating condition parameter, and calculating a second current difference between the second current value and a preset current calibration value;

[0121] Step S703: If the second current difference is not greater than the difference threshold, the drain valve control parameter is set to the corresponding drain valve control parameter under the first operating condition parameter.

[0122] After setting the drain valve control parameter of the fuel cell system to the nitrogen exhaust valve control parameter, it is necessary to update the first operating condition parameter to the second operating condition parameter, and the fuel cell system will now operate under the second operating condition parameter. During operation, the second current value corresponding to the hydrogen circulation pump is obtained, and the second current difference between the second current value and the preset current calibration value is calculated. The above process is similar to the calculation of the first current difference and will not be repeated. After the second current difference is obtained, it is compared with the difference threshold. If the second current difference is not greater than the difference threshold, it indicates that the hydrogen circulation pump is no longer frozen, and the deicing process is terminated. At this time, the drain valve control parameter is set to the corresponding drain valve control parameter under the first operating condition parameter, and the fuel cell system is restored to the working state under the first operating condition parameter.

[0123] In one embodiment, after step S702 of obtaining a second current value corresponding to the hydrogen circulation pump under the second operating condition parameter and calculating a second current difference between the second current value and a preset current calibration value, as Figure 8 As shown, the method also includes:

[0124] Step S801, if the second current difference is greater than the difference threshold, obtaining a second duration of time during which the second current difference is greater than the difference threshold;

[0125] Step S802: When the second duration is not greater than the time threshold, the drain valve control parameter is set to the drain valve control parameter corresponding to the first operating condition parameter.

[0126] After the drain valve control parameter of the fuel cell system is set to the nitrogen drain valve control parameter and the first operating condition parameter is updated to the second operating condition parameter, the second current value corresponding to the hydrogen circulation pump is obtained under the second operating condition parameter, and the second current difference between the second current value and the preset current calibration value is calculated. If the second current difference is greater than the difference threshold, it indicates that the second current value fluctuates in a specific scenario and is abnormally too low. At this time, the drain valve control parameter is set to the corresponding drain valve control parameter under the first operating condition parameter, that is, the fuel cell system is restored to work under the first operating condition parameter in the initial state.

[0127] In actual scenarios, when the fuel cell system operates at a low temperature of -30°C to 0°C, the fuel cell system will detect the speed of the hydrogen circulation pump and the current of the hydrogen circulation pump at each electrical density point of the fuel cell stack in real time. When the difference between the first current value obtained in real time by the hydrogen circulation pump and the current calibration value is greater than 0.1A and lasts for more than 5s, it is determined that the nitrogen exhaust valve at the bottom of the hydrogen circulation pump is frozen. The opening and closing frequency of the nitrogen exhaust valve of the fuel cell system at the corresponding electrical density point under the first operating condition parameters is obtained, and the opening and closing frequency of the water drain valve of the fuel cell system is set to the opening and closing frequency of the nitrogen exhaust valve to eliminate the freezing of the nitrogen exhaust valve at the bottom of the hydrogen circulation pump. During the implementation process, the current value of the hydrogen circulation pump needs to be detected in real time. When the first current difference is not greater than the difference threshold, it is determined that there is no ice at the bottom of the hydrogen circulation pump, and the fuel cell system is controlled to return to the working state under the first operating condition parameters.

[0128] It can be seen that the control method of the above-mentioned fuel cell system provided by the embodiment of the present invention is that when the hydrogen circulation pump in the fuel cell system is in a low temperature environment and is frozen, the method controls the drain valve of the fuel cell system to perform opening and closing actions according to the nitrogen exhaust valve control parameters, thereby increasing the opening and closing frequency of the drain valve, increasing the drainage volume of the drain valve, and then reducing the water intake of the hydrogen circulation pump, and finally realizing the deicing process; this method does not require the additional setting of heating equipment, thereby solving the problems of poor durability and high failure rate of the fuel cell system caused by the use of heating equipment in the prior art.

[0129] For the control method of the fuel cell system provided in the above embodiment, an embodiment of the present invention provides a control device for the fuel cell system, which is used to de-ice the hydrogen circulation pump in the fuel cell system. The air inlet of the hydrogen circulation pump is connected to the air outlet of the water tank in the fuel cell system, and the drain outlet of the water tank is connected to the preset drain outlet in the fuel cell system through a drain valve; the exhaust outlet of the hydrogen circulation pump is connected to the preset exhaust outlet in the fuel cell system through a nitrogen exhaust valve.

[0130] like Fig. 9 As shown, the control device of the fuel cell system includes:

[0131] A first control module 910 is used to obtain a first current value corresponding to a hydrogen circulation pump in a fuel cell system under a preset first operating condition parameter;

[0132] The second control module 920 is used to calculate a first current difference between the first current value and a preset current calibration value, and obtain a first duration during which the first current difference is greater than a preset difference threshold;

[0133] The third control module 930 is used to obtain the nitrogen exhaust valve control parameters of the fuel cell system under the first operating condition parameters when the first duration is greater than the preset time threshold, and control the drain valve of the fuel cell system to perform opening and closing actions according to the nitrogen exhaust valve control parameters.

[0134] The control device of the fuel cell system provided in the embodiment of the present invention performs de-icing processing on the hydrogen circulation pump in the fuel cell system. When the hydrogen circulation pump in the fuel cell system is in a low temperature environment and is frozen, the control device controls the drain valve of the fuel cell system to perform opening and closing actions according to the control parameters of the nitrogen exhaust valve, thereby increasing the opening and closing frequency of the drain valve, increasing the drainage volume of the drain valve, and then reducing the water intake of the hydrogen circulation pump, and finally realizing the de-icing process; the device does not need to additionally set up a heating device, thereby solving the problems of poor durability and high failure rate of the fuel cell system caused by the use of heating equipment in the prior art.

[0135] In one embodiment, the first control module 910 is also used to: obtain the electrical density parameters corresponding to the fuel cell stack and the speed parameters corresponding to the hydrogen circulation pump in the fuel cell system under the preset first operating condition parameters; set multiple reference groups using the electrical density parameters and the speed parameters; wherein the corresponding electrical density parameters and the speed parameters in the reference group are set in a monotonically increasing order; under the corresponding electrical density parameters and the speed parameters in the reference group, respectively obtain the first current value of the hydrogen circulation pump corresponding to each reference group.

[0136] In one embodiment, the second control module 920 is also used to: determine the current calibration value corresponding to the electrical density parameter and the speed parameter using a reference group; monitor the first current difference between the corresponding first current value and the current calibration value under the reference group in real time, and determine whether the first current difference is greater than a preset difference threshold; start timing when the first current difference is greater than the difference threshold, and obtain in real time the first duration of the first current difference being greater than the difference threshold.

[0137] In one embodiment, the third control module 930 is further used to: determine in real time whether the first duration is greater than a time threshold; if so, obtain the nitrogen exhaust valve opening and closing frequency parameter contained in the nitrogen exhaust valve control parameter under the first operating condition parameter; after setting the drain valve opening and closing frequency parameter in the drain valve control parameter to use the nitrogen exhaust valve opening and closing frequency parameter, control the drain valve to perform an opening and closing action according to the nitrogen exhaust valve control parameter.

[0138] In one embodiment, the third control module 930, in the process of setting the drain valve opening and closing frequency parameter in the drain valve control parameter to the nitrogen exhaust valve opening and closing frequency parameter, is also used to: obtain the drain valve opening time and the drain valve closing time corresponding to the drain valve opening and closing frequency parameter under the first operating condition parameter; obtain the nitrogen exhaust valve opening time and the nitrogen exhaust valve closing time corresponding to the nitrogen exhaust valve opening and closing frequency parameter under the first operating condition parameter; if the drain valve opening time is greater than the nitrogen exhaust valve opening time and the drain valve closing time is greater than the nitrogen exhaust valve closing time, then set the drain valve opening and closing frequency parameter to use the nitrogen exhaust valve opening and closing frequency parameter.

[0139] In one embodiment, Fig.10 As shown, the control device of the fuel cell system also includes a fourth control device 940, which is used to: when the first duration is not greater than a time threshold, set the drain valve control parameter of the fuel cell system to the corresponding drain valve control parameter under the first operating condition parameter.

[0140] In one embodiment, Fig.11 As shown, the control device of the fuel cell system also includes a fifth control device 950, which is used to: update the electric density parameters corresponding to the fuel cell stack and the speed parameters corresponding to the hydrogen circulation pump in the first operating condition parameters in real time, and determine the electric density parameters and the speed parameters as the second operating condition parameters; obtain the second current value corresponding to the hydrogen circulation pump under the second operating condition parameters, and calculate the second current difference between the second current value and the preset current calibration value; if the second current difference is not greater than the difference threshold, set the drain valve control parameter to use the corresponding drain valve control parameter under the first operating condition parameters.

[0141] In one embodiment, the fifth control device 950 is also used to: if the second current difference is greater than the difference threshold, obtain the second duration of the second current difference being greater than the difference threshold; when the second duration is not greater than the time threshold, set the drain valve control parameter to the corresponding drain valve control parameter under the first operating condition parameter.

[0142] The control device for the fuel cell system provided in the embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned fuel cell system control method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned fuel cell system control method embodiment.

[0143] This embodiment also provides a fuel cell system, such as Fig.12 As shown, the fuel cell system at least includes a hydrogen circulation path and a fuel cell stack 1210;

[0144] Among them, the hydrogen circulation path includes: a hydrogen circulation pump 1220, a water tank 1230, a drain valve 1240, a nitrogen exhaust valve 1250 and a hydrogen spray valve 1260; hydrogen is input into the air inlet of the hydrogen spray valve 1260, and the air outlet of the hydrogen spray valve 1260 is connected to the anode inlet of the fuel cell stack 1210; the anode outlet of the fuel cell stack 1210 is connected to the inlet of the water tank 1230; the drain outlet of the water tank 1230 is connected to the water inlet of the drain valve 1240; the drain outlet of the drain valve 1240 is connected to the preset drain outlet of the fuel cell system; the air outlet of the water tank 1230 is connected to the air inlet of the hydrogen circulation pump 1220; the exhaust outlet of the hydrogen circulation pump 1220 is connected to the preset exhaust outlet of the fuel cell system; the air outlet of the hydrogen circulation pump 1220 is connected to the anode inlet of the fuel cell stack 1210.

[0145] When deicing the hydrogen circulation pump 1220 in the fuel cell system, the control method of the fuel cell system mentioned in the above embodiment is adopted.

[0146] This embodiment also provides an electronic device. The structural diagram of the electronic device is as follows: Fig.13 As shown, the device includes a processor 101 and a memory 102; wherein the memory 102 is used to store one or more computer instructions, and the one or more computer instructions are executed by the processor to implement the steps of the control method of the above-mentioned fuel cell system.

[0147] Fig.13 The electronic device shown further includes a bus 103 and a communication interface 104 , and the processor 101 , the communication interface 104 and the memory 102 are connected via the bus 103 .

[0148] The memory 102 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The bus 103 may be an ISA bus, a PCI bus, or an EISA bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.13 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0149] The communication interface 104 is used to connect to at least one user terminal and other network units through a network interface, and send the encapsulated IPv4 message or IPv4 message to the user terminal through the network interface.

[0150] The processor 101 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 101. The above processor 101 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The disclosed methods, steps and logic block diagrams in the embodiments of the present disclosure can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present disclosure can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module may be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 102, and the processor 101 reads the information in the memory 102 and completes the steps of the method of the above embodiment in combination with its hardware.

[0151] An embodiment of the present invention further provides a storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method of the fuel cell system mentioned in the above embodiment are executed.

[0152] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0153] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0154] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0155] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present invention can essentially or in other words, the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0156] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A control method for a fuel cell system, characterized in that: The method is used to de-ice a hydrogen circulation pump in a fuel cell system; wherein the air inlet of the hydrogen circulation pump is connected to the air outlet of a water tank in the fuel cell system, the water outlet of the water tank is connected to a preset water outlet in the fuel cell system through a water outlet valve; the exhaust port of the hydrogen circulation pump is connected to a preset exhaust port in the fuel cell system through a nitrogen exhaust valve; The method comprises: Under a preset first operating condition parameter, obtaining a first current value corresponding to the hydrogen circulation pump in the fuel cell system; Calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold; When the first duration is greater than a preset time threshold, a nitrogen exhaust valve control parameter of the fuel cell system under the first operating condition parameter is obtained, and the drain valve of the fuel cell system is controlled to perform an opening and closing action according to the nitrogen exhaust valve control parameter.

2. The control method of the fuel cell system according to claim 1, characterized in that: The step of obtaining a first current value corresponding to the hydrogen circulation pump in the fuel cell system under the preset first operating condition parameters includes: Under the preset first operating condition parameters, an electric density parameter corresponding to the fuel cell stack and a speed parameter corresponding to the hydrogen circulation pump in the fuel cell system are obtained; Using the electric density parameter and the rotation speed parameter to set a plurality of reference groups; wherein the electric density parameter and the rotation speed parameter corresponding to the reference group are set in a monotonically increasing order; Under the corresponding electrical density parameters and the rotational speed parameters in the reference group, the first current value of the hydrogen circulation pump corresponding to each reference group is obtained respectively.

3. The control method of the fuel cell system according to claim 2, characterized in that: The step of calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration of time during which the first current difference is greater than a preset difference threshold, comprises: Determining the current calibration value corresponding to the electric density parameter and the speed parameter using the reference group; real-time monitoring of a first current difference between the first current value corresponding to the reference group and the current calibration value, and determining whether the first current difference is greater than a preset difference threshold; When the first current difference is greater than the difference threshold, timing starts, and the first duration during which the first current difference is greater than the difference threshold is acquired in real time.

4. The control method of the fuel cell system according to claim 1, characterized in that: The step of obtaining the nitrogen exhaust valve control parameter of the fuel cell system under the first operating condition parameter when the first duration is greater than a preset time threshold, and controlling the drain valve of the fuel cell system to perform an opening and closing action according to the nitrogen exhaust valve control parameter, comprises: Determine in real time whether the first duration is greater than the time threshold; If yes, then obtaining the nitrogen exhaust valve opening and closing frequency parameter included in the nitrogen exhaust valve control parameter under the first operating condition parameter; After the drain valve opening and closing frequency parameter in the drain valve control parameter is set to use the nitrogen exhaust valve opening and closing frequency parameter, the drain valve is controlled to perform opening and closing actions according to the nitrogen exhaust valve control parameter.

5. The control method of the fuel cell system according to claim 4, characterized in that: The step of setting the drain valve opening and closing frequency parameter in the drain valve control parameter to use the nitrogen exhaust valve opening and closing frequency parameter comprises: Obtaining the drain valve opening time and the drain valve closing time corresponding to the drain valve opening and closing frequency parameter under the first operating condition parameter; Obtaining the nitrogen exhaust valve opening time and the nitrogen exhaust valve closing time corresponding to the nitrogen exhaust valve opening and closing frequency parameter under the first operating condition parameter; If the drain valve opening time length is greater than the nitrogen exhaust valve opening time length and the drain valve closing time length is greater than the nitrogen exhaust valve closing time length, the drain valve opening and closing frequency parameter is set to use the nitrogen exhaust valve opening and closing frequency parameter.

6. The control method of the fuel cell system according to claim 1, characterized in that: After the steps of calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold, the method further includes: When the first duration is not greater than the time threshold, the drain valve control parameter of the fuel cell system is set to the drain valve control parameter corresponding to the first operating condition parameter.

7. The control method of the fuel cell system according to claim 1, characterized in that: After controlling the drain valve of the fuel cell system to perform an opening and closing action according to the nitrogen exhaust valve control parameter, the method further includes: updating in real time the electric density parameter corresponding to the fuel cell stack and the speed parameter corresponding to the hydrogen circulation pump in the first operating condition parameter, and determining the electric density parameter and the speed parameter as the second operating condition parameter; Obtaining a second current value corresponding to the hydrogen circulation pump under the second operating condition parameter, and calculating a second current difference between the second current value and a preset current calibration value; If the second current difference is not greater than the difference threshold, the drain valve control parameter is set to the drain valve control parameter corresponding to the first operating condition parameter.

8. The control method of the fuel cell system according to claim 7, characterized in that: After the step of obtaining the second current value corresponding to the hydrogen circulation pump under the second operating condition parameter and calculating the second current difference between the second current value and the preset current calibration value, the method further includes: If the second current difference is greater than the difference threshold, obtaining a second duration during which the second current difference is greater than the difference threshold; When the second duration is not greater than the time threshold, the drain valve control parameter is set to the drain valve control parameter corresponding to the first operating condition parameter.

9. A control device for a fuel cell system, characterized in that: The device is used to de-ice a hydrogen circulation pump in a fuel cell system; wherein the air inlet of the hydrogen circulation pump is connected to the air outlet of a water tank in the fuel cell system, and the drain outlet of the water tank is connected to a preset drain outlet in the fuel cell system through a drain valve; and the exhaust outlet of the hydrogen circulation pump is connected to a preset exhaust outlet in the fuel cell system through a nitrogen exhaust valve. The device comprises: A first control module, used for obtaining a first current value corresponding to the hydrogen circulation pump in the fuel cell system under a preset first operating condition parameter; a second control module, configured to calculate a first current difference between the first current value and a preset current calibration value, and obtain a first duration during which the first current difference is greater than a preset difference threshold; The third control module is used to obtain the nitrogen exhaust valve control parameters of the fuel cell system under the first operating condition parameters when the first duration is greater than a preset time threshold, and control the drain valve of the fuel cell system to perform opening and closing actions according to the nitrogen exhaust valve control parameters.

10. A fuel cell system, characterized in that: The fuel cell system at least includes a hydrogen circulation path and a fuel cell stack; Wherein, the hydrogen circulation path comprises: a hydrogen circulation pump, a water tank, a drain valve, a nitrogen exhaust valve and a hydrogen spray valve; the air inlet of the hydrogen spray valve inputs hydrogen, and the air outlet of the hydrogen spray valve is connected to the anode inlet of the fuel cell stack; the anode outlet of the fuel cell stack is connected to the inlet of the water tank; the drain outlet of the water tank is connected to the water inlet of the drain valve; the drain outlet of the drain valve is connected to the preset drain outlet of the fuel cell system; the air outlet of the water tank is connected to the air inlet of the hydrogen circulation pump; the exhaust outlet of the hydrogen circulation pump is connected to the preset exhaust outlet of the fuel cell system; the air outlet of the hydrogen circulation pump is connected to the anode inlet of the fuel cell stack; When deicing the hydrogen circulation pump in the fuel cell system, the control method of the fuel cell system according to any one of claims 1 to 8 is adopted.

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