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

Abstract

The application provides a control method and device of a fuel cell air system, and the fuel cell air system. In the case that the fuel cell air system runs for a first preset time period, it is determined whether an internal leakage phenomenon occurs in a humidifier. The internal leakage phenomenon is a phenomenon that air in a dry side chamber of the humidifier enters a wet side chamber of the humidifier. The first chamber is the dry side chamber of the humidifier, and the second chamber is the wet side chamber of the humidifier. In the case that it is determined that the internal leakage phenomenon occurs in the humidifier, an air excess ratio corresponding to air entering an air inlet of the fuel cell air system is adjusted to a target air excess ratio, so that air pressure entering a stack reaches a target air pressure. The technical problem that the humidifier of the fuel cell air system in the prior art may have the internal leakage phenomenon with the increase of running time, and the air metering ratio entering the stack is reduced, thereby affecting the performance of the stack, is solved. Therefore, the performance of the stack is stabilized, and the effect that the output power of an engine is stabilized is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel cell, in particular to a control method and device of fuel cell air system and the fuel cell air system. BACKGROUND

[0002] In the related art, the fuel cell air system needs an additional humidifier to humidify the air entering the stack to ensure the operating condition requirements of the stack. The humidifier will have an internal leakage phenomenon as the running time increases, which will reduce the air metering ratio of the air entering the stack, affect the performance of the stack, and further reduce the output power of the engine. In the prior art, the internal leakage cannot be monitored by a flow meter.

[0003] No effective technical means have been proposed for the above problems in the related art. SUMMARY

[0004] The main purpose of the present application is to provide a control method and device of fuel cell air system and the fuel cell air system, so as to solve the technical problem that the humidifier of the fuel cell air system in the prior art will have an internal leakage phenomenon as the running time increases, which will reduce the air metering ratio of the air entering the stack, affect the performance of the stack.

[0005] According to an aspect of an embodiment of the present application, a control method of a fuel cell air system is provided. The fuel cell air system includes a intercooler, a humidifier and a stack. The humidifier includes a shell and a partition. The partition is located in a containing cavity of the shell and separates the containing cavity into a first chamber and a second chamber. The stack includes a stack air inlet and a stack air outlet. The intercooler is connected with a first end of the first chamber of the humidifier. A second end of the first chamber is connected with the stack air inlet through a first connecting branch. The control method includes: determining whether the humidifier has an internal leakage phenomenon in a case where the fuel cell air system has been running for a first preset time period, wherein the internal leakage phenomenon is a phenomenon that air in a dry side chamber of the humidifier enters a wet side chamber of the humidifier, the first chamber is the dry side chamber of the humidifier, and the second chamber is the wet side chamber of the humidifier; and adjusting an air excess ratio of air entering an air inlet of the fuel cell air system to a target air excess ratio to make the air pressure entering the stack reach a target air pressure in a case where it is determined that the humidifier has the internal leakage phenomenon.

[0006] Further, the fuel cell air system further includes a back pressure valve. The back pressure valve is connected with a second end of the second chamber. A first end of the second chamber is connected with the stack air outlet. The determination of whether the humidifier has the internal leakage phenomenon after the fuel cell air system has been running for the first preset time period includes: obtaining a current opening degree and an initial opening degree of the back pressure valve; determining an opening degree difference between the initial opening degree and the current opening degree; and determining whether the humidifier has the internal leakage phenomenon according to the opening degree difference.

[0007] Further, the method further comprises: determining whether the humidifier has the internal leakage phenomenon according to the opening difference value, including: determining whether the opening difference value is greater than or equal to an opening threshold value; and determining that the humidifier has the internal leakage phenomenon in a case where the opening difference value is greater than or equal to the opening threshold value.

[0008] Further, the first end of the second chamber is connected with the air outlet of the stack through a second connecting branch, the second end of the second chamber is connected with the back pressure valve, and an air outlet pressure sensor is arranged on the second connecting branch, and the method further comprises: determining whether the humidifier has the internal leakage phenomenon after the fuel cell air system has operated for a first preset time period, including: obtaining a current air outlet pressure collected by the air outlet pressure sensor; obtaining an initial air outlet pressure corresponding to the air outlet pressure sensor; determining a pressure difference value between the current air outlet pressure and the initial air outlet pressure; and determining whether the humidifier has the internal leakage phenomenon according to the pressure difference value.

[0009] Further, the method further comprises: determining whether the humidifier has the internal leakage phenomenon according to the pressure difference value, including: determining whether the pressure difference value is greater than or equal to a difference threshold value; and determining that the humidifier has the internal leakage phenomenon in a case where the pressure difference value is greater than or equal to the difference threshold value.

[0010] Further, the fuel cell air system further comprises a back pressure valve connected with the second end of the second chamber, and the first end of the second chamber is connected with the air outlet of the stack, and the method further comprises: adjusting the air excess ratio corresponding to the fuel cell air system to a target air excess ratio, including: obtaining a current air excess ratio corresponding to the fuel cell air system; determining the target air excess ratio according to the current air excess ratio, and adjusting the air excess ratio corresponding to the fuel cell air system to the target air excess ratio.

[0011] Further, the method further comprises: obtaining an initial opening corresponding to the back pressure valve and a current opening of the back pressure valve; calculating an opening difference value between the initial opening and the current opening; obtaining the current air excess ratio; determining an air excess ratio having a mapping relationship with the current air excess ratio according to the opening difference value, and determining the air excess ratio as the target air excess ratio.

[0012] Further, in a case where it is determined that the humidifier has the internal leakage phenomenon, the method further comprises: adjusting the air excess ratio corresponding to the fuel cell air system to the target air excess ratio so that the air pressure entering the stack reaches the target air pressure, and then determining whether the adjustment of the air excess ratio of the fuel cell air system is ended; and controlling the fuel cell air system to draw a target current in a case where the adjustment of the air excess ratio is ended.

[0013] Further, the fuel cell air system further comprises a back pressure valve connected to the second end of the second chamber, the first end of the second chamber being connected to the air outlet of the stack through a second connecting branch, and an air outlet pressure sensor being arranged on the second connecting branch, and the method for determining whether the adjustment of the air excess ratio of the fuel cell air system is completed comprises: after a second preset time period after the air excess ratio is adjusted to the target air excess ratio, obtaining the opening degree of the back pressure valve and the outlet pressure value collected by the air outlet pressure sensor; and in the case that the air outlet pressure is kept within a preset pressure value range and the opening degree of the back pressure valve is kept within a preset opening degree range, it is determined that the adjustment of the air excess ratio is completed.

[0014] According to another aspect of the embodiments of the present application, a control device for a fuel cell air system is further provided, the fuel cell air system comprising a intercooler, a humidifier and a stack, the humidifier comprising a housing and a partition, the partition being located in a containing cavity of the housing and separating the containing cavity into a first chamber and a second chamber, the stack comprising a stack air inlet and a stack air outlet, the intercooler being connected to the first end of the first chamber of the humidifier, and the second end of the first chamber being connected to the stack air inlet through a first connecting branch, the control device comprising: a first determining unit configured to determine whether an internal leakage phenomenon occurs in the humidifier in the case that the fuel cell air system is operated for a first preset time period, wherein the internal leakage phenomenon is a phenomenon that air in a dry side chamber of the humidifier enters a wet side chamber of the humidifier, the first chamber is the dry side chamber of the humidifier, and the second chamber is the wet side chamber of the humidifier; and an adjusting unit configured to adjust an air excess ratio corresponding to air entering the fuel cell air system to a target air excess ratio to make the air pressure entering the stack reach a target air pressure in the case that it is determined that the internal leakage phenomenon occurs in the humidifier.

[0015] According to another aspect of the embodiments of the present application, a fuel cell air system is further provided, comprising a control device for a fuel cell air system, which is configured to execute a control method for a fuel cell air system.

[0016] According to another aspect of the embodiments of the present application, a computer readable storage medium is further provided, the computer readable storage medium comprising a stored program, wherein the program is configured to execute a control method for a fuel cell air system.

[0017] According to another aspect of the embodiments of the present application, a processor is further provided, the processor being configured to run a program, wherein the program is configured to execute a control method for a fuel cell air system when running.

[0018] According to another aspect of the embodiments of the present application, an electronic device is also provided, which includes one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include a control method of a fuel cell air system according to any one of the embodiments 1 to 9.

[0019] In the embodiments of the present application, by determining whether the humidifier has an internal leakage phenomenon in a case that the fuel cell air system has been operated for a first preset time period, wherein the internal leakage phenomenon is a phenomenon that air in a dry side chamber of the humidifier enters a wet side chamber of the humidifier, the first chamber is the dry side chamber of the humidifier, and the second chamber is the wet side chamber of the humidifier; and adjusting the air excess ratio corresponding to the air entering the air inlet of the fuel cell air system to a target air excess ratio to make the air pressure entering the stack reach a target air pressure in a case that it is determined that the humidifier has the internal leakage phenomenon, the technical problem that the humidifier of the fuel cell air system in the prior art has the internal leakage phenomenon with the increase of the operation time, which leads to the decrease of the air metering ratio entering the stack and affects the performance of the stack is solved, and the technical effects that the performance of the stack is stabilized and the output power of the engine is stabilized are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the embodiments of the present application and their descriptions, and do not constitute improper limitations to the present application. In the drawings:

[0021] Figure 1 is a flow chart of a control method of a fuel cell air system according to an embodiment of the present application;

[0022] Figure 2 shows an architecture diagram of an air system;

[0023] Figure 3 is a schematic diagram of a control device of a fuel cell air system according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application, so that those skilled in the art can better understand the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should be within the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] It should be understood that when an element (such as a layer, film, region, or substrate) is described as "on" another element, it can be directly on the other element, or there can be an intermediate element. Also, in the specification and claims, when an element is described as "connected" to another element, it can be "directly connected" to the other element, or "connected" to the other element through a third element.

[0028] As mentioned in the background, the humidifier of the fuel cell air system in the prior art will have internal leakage phenomenon with the increase of running time, which will cause the air metering ratio entering the stack to decrease, and affect the technical problem of the performance of the stack. In order to solve the above problem, in a typical embodiment of the present application, a control method and device of a fuel cell air system, and a fuel cell air system are provided.

[0029] According to the embodiments of the present application, a control method of a fuel cell air system is provided.

[0030] Figure 1 is a flow chart of a control method of a fuel cell air system according to an embodiment of the present application. As shown in Figure 1 , the method comprises the following steps:

[0031] Step S101, in the case that the fuel cell air system runs for a first preset time period, it is determined whether the humidifier has an internal leakage phenomenon, wherein the internal leakage phenomenon is the phenomenon that air in a dry side chamber of the humidifier enters a wet side chamber of the humidifier, the first chamber is the dry side chamber of the humidifier, and the second chamber is the wet side chamber of the humidifier.

[0032] Step S102, in the case that it is determined that the humidifier has the internal leakage phenomenon, the air excess ratio corresponding to the air entering the air inlet of the fuel cell air system is adjusted to a target air excess ratio, so that the air pressure entering the stack reaches a target air pressure.

[0033] Therefore, the present application provides a fuel cell air system, a schematic diagram of the air system is shown in Figure 2 , which mainly comprises an air filter device, a mass flow meter, an air compressor, a intercooler, a humidifier, an air inlet pressure sensor, an air outlet pressure sensor, and a back pressure valve, and the connection relationship of the components is shown in Figure 2 .

[0034] Specifically, as the running time of the fuel cell engine increases, due to the high dry side pressure, there will be a leakage from the dry side to the wet side, which is called internal leakage. The present application determines whether the humidifier in the fuel cell air system has an internal leakage phenomenon by monitoring the data collected by each component in the air system, and adjusts the air excess ratio corresponding to the air entering the air system in the case that the humidifier has an internal leakage phenomenon.

[0035] By the above method, the self-adaptive control method of the stack air excess ratio is ensured, and the air excess ratio of the stack in the whole life cycle is realized to meet the demand of the stack.

[0036] In an optional embodiment, the fuel cell air system further comprises a back pressure valve, the back pressure valve is connected with the second end of the second chamber, the first end of the second chamber is connected with the stack air outlet of the stack, and after the fuel cell air system runs for a first preset time period, it is determined whether the humidifier has an internal leakage phenomenon, comprising: obtaining the current opening degree and the initial opening degree of the back pressure valve; determining the opening degree difference between the initial opening degree and the current opening degree; determining whether the humidifier has an internal leakage phenomenon according to the opening degree difference. Determining whether the humidifier has an internal leakage phenomenon comprises: judging whether the opening degree difference is greater than or equal to an opening degree threshold; in the case that the opening degree difference is greater than or equal to the opening degree threshold, it is determined that the humidifier has an internal leakage phenomenon.

[0037] Therefore, the present application provides a method for determining whether the humidifier has internal leakage, which determines whether the humidifier has internal leakage by the opening difference between the current opening of the back pressure valve and the initial opening. If the opening of the back pressure valve is monitored to decrease, it is determined that the humidifier has internal leakage. The principle is that, in the case of internal leakage of the humidifier, the opening of the back pressure valve needs to decrease to ensure that the air pressure entering the stack is unchanged in order to make the air pressure entering the stack be the target pressure.

[0038] It should be noted that, since the opening of the back pressure valve can change in an acceptable range during the operation of the air system, even if the humidifier does not have internal leakage, if the change value is within the acceptable range, it is determined that the humidifier does not have abnormal phenomenon.

[0039] In an alternative embodiment, the first end of the second chamber is connected with the stack air outlet of the stack through a second connecting branch, the second end of the second chamber is connected with the back pressure valve, and an air outlet pressure sensor is arranged on the second connecting branch. After the fuel cell air system is operated for a first preset time period, it is determined whether the humidifier has internal leakage, which comprises: acquiring the current air outlet pressure collected by the air outlet pressure sensor; acquiring the initial air outlet pressure corresponding to the air outlet pressure sensor; determining the pressure difference between the current air outlet pressure and the initial air outlet pressure; and determining whether the humidifier has internal leakage according to the pressure difference. According to the pressure difference, it is determined whether the humidifier has internal leakage, which comprises: judging whether the pressure difference is greater than or equal to a difference threshold; and in the case that the pressure difference is greater than or equal to the difference threshold, it is determined that the humidifier has internal leakage.

[0040] Therefore, the present application also provides another method for determining whether the humidifier has internal leakage, which determines whether the humidifier has internal leakage by the pressure difference between the current pressure value and the initial pressure value collected by the air outlet sensor. If the current pressure value is greater than the initial pressure value, it is determined that the humidifier has internal leakage. The principle is that, in the case of internal leakage of the humidifier, the opening of the back pressure valve decreases in order to make the pressure value collected by the air inlet pressure sensor be the target pressure value, and then the pressure value collected by the stack outlet pressure sensor increases.

[0041] Similarly, it should be noted that, since the pressure value at the outlet is not always unchanged during the operation of the air system, in the case that the pressure value at the outlet is within an acceptable range, it is determined that the humidifier does not have internal leakage.

[0042] In an alternative embodiment, the fuel cell air system further comprises a back pressure valve connected to the second end of the second chamber, and the first end of the second chamber is connected to the air outlet of the fuel cell stack, and the method for adjusting the corresponding air excess ratio of the fuel cell air system to the target air excess ratio comprises: obtaining the current air excess ratio corresponding to the fuel cell air system; determining the target air excess ratio according to the current air excess ratio, and adjusting the air excess ratio corresponding to the fuel cell air system to the target air excess ratio. The target air excess ratio is determined according to the current air excess ratio, which comprises: obtaining the initial opening degree corresponding to the back pressure valve and the current opening degree of the back pressure valve; calculating the opening degree difference between the initial opening degree and the current opening degree; obtaining the current air excess ratio; determining the air excess ratio which has a mapping relationship with the current air excess ratio according to the opening degree difference, and determining the air excess ratio as the target air excess ratio.

[0043] Therefore, after determining that the humidifier has an internal leakage phenomenon, the air excess ratio of the air system needs to be adjusted to ensure that the air flow entering the fuel cell stack meets the demand. The target air excess ratio corresponding to the current air excess ratio can be determined according to the opening degree difference between the current opening degree and the initial opening degree of the back pressure valve, and then the PID method is used for adjusting the air excess ratio until the opening degree of the back pressure valve and the pressure at the air outlet are within the expected range.

[0044] The target air excess ratio can be determined according to the opening degree difference of the back pressure valve and the current air excess ratio, and the specific mapping relationship is determined by experiment. For example, when the current air excess ratio is 1.5, the target air excess ratio is determined to be 1.8 according to the opening degree difference. By directly replacing the air excess ratio to 1.8 instead of slowly adjusting it from 1.5, the adjustment time is reduced and the adjustment efficiency is improved.

[0045] In an alternative embodiment, after determining that the humidifier has an internal leakage phenomenon, the method for adjusting the air excess ratio corresponding to the fuel cell air system to the target air excess ratio to make the air pressure entering the fuel cell stack reach the target air pressure further comprises: determining whether the air excess ratio adjustment of the fuel cell air system is completed; and controlling the fuel cell air system to draw the target current when the air excess ratio adjustment is completed. The determination of whether the air excess ratio adjustment of the fuel cell air system is completed comprises: obtaining the opening degree of the back pressure valve and the outlet pressure value collected by the air outlet pressure sensor after a second preset time period after the air excess ratio is adjusted to the target air excess ratio; and determining that the air excess ratio adjustment is completed when the air outlet pressure is maintained within a preset pressure value range and the opening degree of the back pressure valve is maintained within a preset opening degree range.

[0046] As mentioned above, when the opening degree of the back pressure valve is detected to be within the preset range and the air outlet pressure is maintained within the preset pressure value range, it is determined that the air excess ratio adjustment process of the air system has ended. At this time, the air system normally draws the load current.

[0047] The control method for a fuel cell air system provided in this application adaptively adjusts the excess air ratio of the air system when an internal leak is detected in the humidifier, thereby preventing the performance degradation of the fuel cell stack due to component failure; at the same time, it realizes online real-time adjustment of the excess air ratio, improving the durability of the fuel cell stack.

[0048] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0049] This application also provides a control device for a fuel cell air system. It should be noted that this control device can be used to execute the control method for a fuel cell air system provided in this application. The following describes the control device for a fuel cell air system provided in this application.

[0050] This application also provides a fuel cell air system, including a control device for the fuel cell air system, for executing a control method for the fuel cell air system.

[0051] Figure 3 This is a schematic diagram of a control device for a fuel cell air system according to an embodiment of this application. Figure 3 As shown, the device includes: a first determining unit 301, used to determine whether the humidifier has experienced internal leakage after the fuel cell air system has been running for a first preset time period, wherein internal leakage is the phenomenon of air from the dry side chamber of the humidifier entering the wet side chamber of the humidifier, the first chamber being the dry side chamber of the humidifier, and the second chamber being the wet side chamber of the humidifier; and an adjusting unit 302, used to adjust the air excess ratio corresponding to the air entering the air inlet of the fuel cell air system to a target air excess ratio when it is determined that the humidifier has experienced internal leakage, so as to make the air pressure entering the stack reach the target air pressure.

[0052] In an alternative embodiment, the fuel cell air system further comprises a back pressure valve connected to the second end of the second chamber, and the first end of the second chamber is connected to the air outlet of the stack, and the first determining unit 301 comprises: a first obtaining subunit configured to obtain the current opening degree and the initial opening degree of the back pressure valve; a first determining subunit configured to determine an opening degree difference between the initial opening degree and the current opening degree; and a second determining subunit configured to determine whether the humidifier has the internal leakage phenomenon according to the opening degree difference.

[0053] In an alternative embodiment, the second determining subunit comprises: a first judging module configured to determine whether the opening degree difference is greater than or equal to an opening degree threshold value; and a first determining module configured to determine that the humidifier has the internal leakage phenomenon when the opening degree difference is greater than or equal to the opening degree threshold value.

[0054] In an alternative embodiment, the first end of the second chamber is connected to the air outlet of the stack through a second connecting branch, and the second end of the second chamber is connected to the back pressure valve, and an air outlet pressure sensor is arranged on the second connecting branch, and the first determining unit 301 comprises: a second obtaining subunit configured to obtain a current air outlet pressure collected by the air outlet pressure sensor; a third obtaining subunit configured to obtain an initial air outlet pressure corresponding to the air outlet pressure sensor; a third determining subunit configured to determine a pressure difference between the current air outlet pressure and the initial air outlet pressure; and a fourth determining subunit configured to determine whether the humidifier has the internal leakage phenomenon according to the pressure difference.

[0055] In an alternative embodiment, the fourth determining subunit comprises: a second judging module configured to determine whether the pressure difference is greater than or equal to a difference threshold value; and a second determining module configured to determine that the humidifier has the internal leakage phenomenon when the pressure difference is greater than or equal to the difference threshold value.

[0056] In an alternative embodiment, the fuel cell air system further comprises a back pressure valve connected to the second end of the second chamber, and the first end of the second chamber is connected to the air outlet of the stack, and the adjusting unit 302 comprises: a fourth obtaining subunit configured to obtain a current air excess ratio corresponding to the fuel cell air system; and an adjusting subunit configured to determine a target air excess ratio according to the current air excess ratio, and adjust the air excess ratio corresponding to the fuel cell air system to the target air excess ratio.

[0057] In an alternative embodiment, the adjusting subunit comprises: a first obtaining module configured to obtain an initial opening degree corresponding to the back pressure valve and a current opening degree of the back pressure valve; a calculating module configured to calculate an opening degree difference between the initial opening degree and the current opening degree; a second obtaining module configured to obtain the current air excess ratio; and a third determining module configured to determine an air excess ratio having a mapping relationship with the current air excess ratio according to the opening degree difference, and determine the air excess ratio as the target air excess ratio.

[0058] In an alternative embodiment, the second determining unit is configured to, in the case that the humidifier is determined to have the internal leakage phenomenon, adjust the corresponding air excess ratio of the fuel cell air system to the target air excess ratio, and determine whether the air excess ratio adjustment of the fuel cell air system is completed after the air pressure entering the stack reaches the target air pressure; and the control unit is configured to, in the case that the air excess ratio adjustment is completed, control the fuel cell air system to draw the target current.

[0059] In an alternative embodiment, the fuel cell air system further comprises a back pressure valve connected to the second end of the second chamber, and the first end of the second chamber is connected to the air outlet of the stack through a second connecting branch, and an air outlet pressure sensor is arranged on the second connecting branch; and the second determining unit comprises: a fifth acquisition sub-unit configured to acquire the opening degree of the back pressure valve and the outlet pressure value collected by the air outlet pressure sensor after a second preset time period after the air excess ratio is adjusted to the target air excess ratio; and a fifth determination sub-unit configured to determine that the air excess ratio adjustment is completed in the case that the air outlet pressure is maintained within a preset pressure value range and the opening degree of the back pressure valve is maintained within a preset opening degree range.

[0060] The control device of the fuel cell air system comprises a processor and a memory, and the first determining unit 301 and the like are stored in the memory as program units, and the corresponding functions are realized by the processor executing the program units stored in the memory.

[0061] The processor comprises a core, and the core retrieves the corresponding program units from the memory. The core can be one or more, and the technical problem that the humidifier of the fuel cell air system in the prior art has the internal leakage phenomenon with the increase of the running time, which reduces the air measurement ratio entering the stack and affects the performance of the stack, can be solved by adjusting the core parameters.

[0062] The memory can comprise a non-permanent memory in a computer readable medium, a random access memory (RAM) and / or a non-volatile memory such as a read-only memory (ROM) or a flash memory (flash RAM), and the memory comprises at least one memory chip.

[0063] The embodiment of the present application provides a computer readable storage medium, which stores a program, and the program is executed by a processor to realize the control method of the fuel cell air system.

[0064] The embodiment of the present application provides a processor, which is used to run a program, and the program is executed to realize the control method of the fuel cell air system.

[0065] The embodiment of the present application provides a device, the device comprises a processor, a memory and a program stored on the memory and executable on the processor, and at least the following steps are realized when the processor executes the program: determining whether an internal leakage phenomenon of a humidifier occurs when a fuel cell air system runs for a first preset time period, wherein the internal leakage phenomenon is a phenomenon that air in a dry side chamber of the humidifier enters a wet side chamber of the humidifier, the first chamber is the dry side chamber of the humidifier, and the second chamber is the wet side chamber of the humidifier; and adjusting an air excess ratio corresponding to air entering an air inlet of the fuel cell air system to a target air excess ratio to make air pressure entering an electric pile reach a target air pressure when it is determined that the internal leakage phenomenon of the humidifier occurs.

[0066] Optionally, the fuel cell air system further comprises a back pressure valve, the back pressure valve is connected with a second end of the second chamber, a first end of the second chamber is connected with an electric pile air outlet of the electric pile, and the determination of whether the internal leakage phenomenon of the humidifier occurs after the fuel cell air system runs for the first preset time period comprises the following steps: acquiring a current opening degree and an initial opening degree of the back pressure valve; determining an opening degree difference value between the initial opening degree and the current opening degree; and determining whether the internal leakage phenomenon of the humidifier occurs according to the opening degree difference value.

[0067] Optionally, the determination of whether the internal leakage phenomenon of the humidifier occurs according to the opening degree difference value comprises the following steps: judging whether the opening degree difference value is greater than or equal to an opening degree threshold value; and determining that the internal leakage phenomenon of the humidifier occurs when the opening degree difference value is greater than or equal to the opening degree threshold value.

[0068] Optionally, the first end of the second chamber is connected with the electric pile air outlet of the electric pile through a second connecting branch, the second end of the second chamber is connected with the back pressure valve, and an air outlet pressure sensor is arranged on the second connecting branch, and the determination of whether the internal leakage phenomenon of the humidifier occurs after the fuel cell air system runs for the first preset time period comprises the following steps: acquiring a current air outlet pressure collected by the air outlet pressure sensor; acquiring an initial air outlet pressure corresponding to the air outlet pressure sensor; determining a pressure difference value between the current air outlet pressure and the initial air outlet pressure; and determining whether the internal leakage phenomenon of the humidifier occurs according to the pressure difference value.

[0069] Optionally, the determination of whether the internal leakage phenomenon of the humidifier occurs according to the pressure difference value comprises the following steps: judging whether the pressure difference value is greater than or equal to a difference value threshold value; and determining that the internal leakage phenomenon of the humidifier occurs when the pressure difference value is greater than or equal to the difference value threshold value.

[0070] Optionally, the fuel cell air system further comprises a back pressure valve connected to the second end of the second chamber, and the first end of the second chamber is connected to the air outlet of the fuel cell stack; and the method for adjusting the corresponding air excess ratio of the fuel cell air system to the target air excess ratio comprises: obtaining the current air excess ratio of the fuel cell air system; determining the target air excess ratio according to the current air excess ratio, and adjusting the air excess ratio of the fuel cell air system to the target air excess ratio.

[0071] Optionally, the method for determining the target air excess ratio according to the current air excess ratio comprises: obtaining the initial opening degree corresponding to the back pressure valve and the current opening degree of the back pressure valve; calculating the opening degree difference between the initial opening degree and the current opening degree; obtaining the current air excess ratio; determining the air excess ratio which has a mapping relationship with the current air excess ratio according to the opening degree difference, and determining the air excess ratio as the target air excess ratio.

[0072] Optionally, after the air pressure entering the fuel cell stack reaches the target air pressure in the case that the air excess ratio of the fuel cell air system is adjusted to the target air excess ratio in the case that the internal leakage phenomenon of the humidifier is determined, the method further comprises: determining whether the adjustment of the air excess ratio of the fuel cell air system is completed; and controlling the fuel cell air system to draw the target current in the case that the adjustment of the air excess ratio is completed.

[0073] Optionally, the fuel cell air system further comprises a back pressure valve connected to the second end of the second chamber, and the first end of the second chamber is connected to the air outlet of the fuel cell stack through a second connecting branch, and the second connecting branch is provided with an air outlet pressure sensor; and the method for determining whether the adjustment of the air excess ratio of the fuel cell air system is completed comprises: obtaining the opening degree of the back pressure valve and the outlet pressure value collected by the air outlet pressure sensor after a second preset time period after the air excess ratio is adjusted to the target air excess ratio; and determining that the adjustment of the air excess ratio is completed in the case that the air outlet pressure is kept within a preset pressure value range and the opening degree of the back pressure valve is kept within a preset opening degree range. The device in the present application can be a server, a PC, a PAD, a mobile phone, etc.

[0074] The present application further provides a computer program product, which is adapted to execute a program comprising at least the following method steps when executed on a data processing device: determining whether an internal leakage phenomenon occurs in a humidifier in the case that a fuel cell air system runs for a first preset time period, wherein the internal leakage phenomenon is a phenomenon that air in a dry side chamber of the humidifier enters a wet side chamber of the humidifier, the first chamber is the dry side chamber of the humidifier, and the second chamber is the wet side chamber of the humidifier; and adjusting the air excess ratio of air entering an air inlet of the fuel cell air system to a target air excess ratio in the case that the internal leakage phenomenon occurs in the humidifier, so that the air pressure entering a fuel cell stack reaches a target air pressure.

[0075] Optionally, the fuel cell air system further comprises a back pressure valve connected to the second end of the second chamber, and the first end of the second chamber is connected to the air outlet of the stack, and the method for determining whether the humidifier has the internal leakage phenomenon after the fuel cell air system has been operated for the first preset time period comprises: obtaining a current opening degree and an initial opening degree of the back pressure valve; determining an opening degree difference between the initial opening degree and the current opening degree; and determining whether the humidifier has the internal leakage phenomenon according to the opening degree difference.

[0076] Optionally, the method for determining whether the humidifier has the internal leakage phenomenon according to the opening degree difference comprises: judging whether the opening degree difference is greater than or equal to an opening degree threshold value; and determining that the humidifier has the internal leakage phenomenon in a case where the opening degree difference is greater than or equal to the opening degree threshold value.

[0077] Optionally, the first end of the second chamber is connected to the air outlet of the stack through a second connecting branch, and the second end of the second chamber is connected to the back pressure valve, and an air outlet pressure sensor is arranged on the second connecting branch, and the method for determining whether the humidifier has the internal leakage phenomenon after the fuel cell air system has been operated for the first preset time period comprises: obtaining a current air outlet pressure collected by the air outlet pressure sensor; obtaining an initial air outlet pressure corresponding to the air outlet pressure sensor; determining a pressure difference between the current air outlet pressure and the initial air outlet pressure; and determining whether the humidifier has the internal leakage phenomenon according to the pressure difference.

[0078] Optionally, the method for determining whether the humidifier has the internal leakage phenomenon according to the pressure difference comprises: judging whether the pressure difference is greater than or equal to a difference threshold value; and determining that the humidifier has the internal leakage phenomenon in a case where the pressure difference is greater than or equal to the difference threshold value.

[0079] Optionally, the fuel cell air system further comprises a back pressure valve connected to the second end of the second chamber, and the first end of the second chamber is connected to the air outlet of the stack, and the method for adjusting the air excess ratio corresponding to the fuel cell air system to the target air excess ratio comprises: obtaining a current air excess ratio corresponding to the fuel cell air system; determining the target air excess ratio according to the current air excess ratio, and adjusting the air excess ratio corresponding to the fuel cell air system to the target air excess ratio.

[0080] Optionally, the method for determining the target air excess ratio according to the current air excess ratio comprises: obtaining an initial opening degree corresponding to the back pressure valve and a current opening degree of the back pressure valve; calculating an opening degree difference between the initial opening degree and the current opening degree; obtaining the current air excess ratio; determining an air excess ratio that has a mapping relationship with the current air excess ratio according to the opening degree difference, and determining the air excess ratio as the target air excess ratio.

[0081] Optionally, after the air excess ratio of the fuel cell air system is adjusted to the target air excess ratio, and the air pressure entering the stack reaches the target air pressure, the method further comprises: determining whether the air excess ratio adjustment of the fuel cell air system is completed; and controlling the fuel cell air system to draw the target current when the air excess ratio adjustment is completed.

[0082] Optionally, the fuel cell air system further comprises a back pressure valve connected to the second end of the second chamber, and the first end of the second chamber is connected to the air outlet of the stack through a second connecting branch, and an air outlet pressure sensor is arranged on the second connecting branch. The method of determining whether the air excess ratio adjustment of the fuel cell air system is completed comprises: after a second preset time period after the air excess ratio is adjusted to the target air excess ratio, obtaining the opening degree of the back pressure valve and the outlet pressure value collected by the air outlet pressure sensor; and determining that the air excess ratio adjustment is completed when the air outlet pressure is maintained within a preset pressure value range and the opening degree of the back pressure valve is maintained within a preset opening degree range.

[0083] In the above embodiments of the present application, the description of each embodiment focuses on different aspects, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0084] In several embodiments provided in the present application, it should be understood that the disclosed technical contents can be implemented by other manners. Among them, the device embodiments described above are only schematic, for example, the division of units can be a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or modules shown or discussed can be indirect coupling or communication connection through some interfaces, units or modules, which can be electrical or other forms.

[0085] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0086] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The above integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0087] If the integrated unit is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application essentially or say the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the method of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0088] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0089] 1) The present application judges the internal leakage of the humidifier through the air outlet pressure and the back pressure valve opening degree, avoids the performance degradation of the stack due to the failure of the parts, and realizes the online real-time adjustment of the excess ratio and improves the durability of the stack.

[0090] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A control method of a fuel cell air system, characterized by, The fuel cell air system comprises a intercooler, a humidifier and a stack, the humidifier comprises a housing and a partition, the partition is located in a containing cavity of the housing and separates the containing cavity into a first chamber and a second chamber, the stack comprises a stack air inlet and a stack air outlet, the intercooler is connected with a first end of the first chamber of the humidifier, a second end of the first chamber is connected with the stack air inlet through a first connecting branch, and the method comprises: In a case where the fuel cell air system operates for a first preset time period, it is determined whether the humidifier has an internal leakage phenomenon, wherein the internal leakage phenomenon is a phenomenon that air in a dry side chamber of the humidifier enters a wet side chamber of the humidifier, the first chamber is the dry side chamber of the humidifier, and the second chamber is the wet side chamber of the humidifier; In a case where it is determined that the humidifier has the internal leakage phenomenon, an air excess ratio corresponding to air entering an air inlet of the fuel cell air system is adjusted to a target air excess ratio, so that air pressure entering the stack reaches a target air pressure, The fuel cell air system further comprises a back pressure valve, the back pressure valve is connected with a second end of the second chamber, a first end of the second chamber is connected with the stack air outlet of the stack, after the fuel cell air system operates for a first preset time period, it is determined whether the humidifier has an internal leakage phenomenon, comprising: obtaining a current opening degree and an initial opening degree of the back pressure valve; determining an opening degree difference value between the initial opening degree and the current opening degree; determining whether the opening degree difference value is greater than or equal to an opening degree threshold value; in a case where the opening degree difference value is greater than or equal to the opening degree threshold value, it is determined that the humidifier has the internal leakage phenomenon, The first end of the second chamber is connected with the stack air outlet of the stack through a second connecting branch, the second end of the second chamber is connected with a back pressure valve, and an air outlet pressure sensor is arranged on the second connecting branch, after the fuel cell air system operates for a first preset time period, it is determined whether the humidifier has an internal leakage phenomenon, comprising: obtaining a current air outlet pressure collected by the air outlet pressure sensor; obtaining an initial air outlet pressure corresponding to the air outlet pressure sensor; determining a pressure difference value between the current air outlet pressure and the initial air outlet pressure; determining whether the humidifier has the internal leakage phenomenon according to the pressure difference value, The fuel cell air system further comprises a back pressure valve connected with the second end of the second chamber, and the first end of the second chamber is connected with the air outlet of the stack, and the method for adjusting the corresponding air excess ratio of the fuel cell air system to a target air excess ratio comprises the following steps: obtaining a current air excess ratio corresponding to the fuel cell air system; obtaining an initial opening degree corresponding to the back pressure valve and a current opening degree of the back pressure valve; calculating an opening degree difference between the initial opening degree and the current opening degree; obtaining the current air excess ratio; determining an air excess ratio having a mapping relationship with the current air excess ratio according to the opening degree difference, and determining the air excess ratio as the target air excess ratio, and adjusting the air excess ratio corresponding to the fuel cell air system to the target air excess ratio.

2. The method of claim 1, wherein, According to the pressure difference, it is determined whether the humidifier has the internal leakage phenomenon, which comprises: determining whether the pressure difference is greater than or equal to a difference threshold value; in the case that the pressure difference is greater than or equal to the difference threshold value, it is determined that the humidifier has the internal leakage phenomenon.

3. The method of claim 1, wherein, In the case that it is determined that the humidifier has the internal leakage phenomenon, after the air pressure entering the stack reaches a target air pressure, the method further comprises: determining whether the air excess ratio adjustment of the fuel cell air system is completed; in the case that the air excess ratio adjustment is completed, controlling the fuel cell air system to pull a target current.

4. The method of claim 3, wherein, The fuel cell air system further comprises a back pressure valve connected with the second end of the second chamber, and the first end of the second chamber is connected with the air outlet of the stack through a second connecting branch, and an air outlet pressure sensor is arranged on the second connecting branch, and determining whether the air excess ratio adjustment of the fuel cell air system is completed comprises: after a second preset time period after the air excess ratio is adjusted to the target air excess ratio, obtaining the opening degree of the back pressure valve and the outlet pressure value collected by the air outlet pressure sensor; in the case that the air outlet pressure is kept within a preset pressure value range and the opening degree of the back pressure valve is kept within a preset opening degree range, it is determined that the air excess ratio adjustment is completed.

5. A control device for a fuel cell air system, characterized by The fuel cell air system comprises a intercooler, a humidifier and a stack, the humidifier comprises a shell and a partition, the partition is located in a containing cavity of the shell and separates the containing cavity into a first chamber and a second chamber, the stack comprises a stack air inlet and a stack air outlet, the intercooler is connected with the first end of the first chamber of the humidifier, the second end of the first chamber is connected with the stack air inlet through a first connecting branch, and the device comprises: The first determining unit is configured to determine whether the humidifier has an internal leakage phenomenon when the fuel cell air system has been operated for a first preset time period, wherein the internal leakage phenomenon is a phenomenon that air in a dry side chamber of the humidifier enters a wet side chamber of the humidifier, the first chamber is the dry side chamber of the humidifier, and the second chamber is the wet side chamber of the humidifier. The adjusting unit is configured to adjust an air excess ratio corresponding to air entering an air inlet of the fuel cell air system to a target air excess ratio to make air pressure entering the stack reach a target air pressure when it is determined that the humidifier has the internal leakage phenomenon. The fuel cell air system further comprises a back pressure valve connected to a second end of the second chamber, and a first end of the second chamber is connected to the stack air outlet of the stack, the first determining unit comprises: a first obtaining subunit configured to obtain a current opening degree and an initial opening degree of the back pressure valve; a first determining subunit configured to determine an opening degree difference between the initial opening degree and the current opening degree; and a second determining subunit configured to determine whether the opening degree difference is greater than or equal to an opening degree threshold value, and determine that the humidifier has the internal leakage phenomenon when the opening degree difference is greater than or equal to the opening degree threshold value. The fuel cell air system further comprises a back pressure valve connected to a second end of the second chamber, and a first end of the second chamber is connected to the stack air outlet of the stack, the adjusting unit comprises: a fourth obtaining subunit configured to obtain a current air excess ratio corresponding to the fuel cell air system; an adjusting subunit configured to obtain an initial opening degree corresponding to the back pressure valve and a current opening degree of the back pressure valve; calculate an opening degree difference between the initial opening degree and the current opening degree; obtain the current air excess ratio; determine an air excess ratio that has a mapping relationship with the current air excess ratio according to the opening degree difference, and determine the air excess ratio as the target air excess ratio, and adjust the air excess ratio corresponding to the fuel cell air system to the target air excess ratio.

6. A fuel cell air system characterized by, The control device of the fuel cell air system is configured to execute the control method of the fuel cell air system according to any one of claims 1 to 4.

7. A computer readable storage medium characterized in that, The computer readable storage medium comprises a stored program, wherein the program executes the control method of the fuel cell air system according to any one of claims 1 to 4.

8. A processor, comprising: The processor is configured to run a program, wherein the program executes the control method of the fuel cell air system according to any one of claims 1 to 4 when running.

9. An electronic device, comprising: The processor is configured to run a program, wherein the program executes the control method of the fuel cell air system according to any one of claims 1 to 4 when running. The processor is configured to run a program, wherein the program executes the control method of the fuel cell air system according to any one of claims 1 to 4 when running. The processor is configured to run a program, wherein the program executes the control method of the fuel cell air system according to any one of claims 1 to 4 when running. The processor is configured to run a program, wherein the program executes the control method of the fuel cell air system according to any one of claims 1 to 4 when running.

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