Tail exhaust control method of fuel cell system and fuel cell system

Abstract

The invention provides a tail emission control method of a fuel cell system and the fuel cell system. The method comprises the following steps: acquiring actual output power and actual reactor core humidity of a fuel cell system; according to the actual output power, reference control parameters of the tail exhaust valve are determined, and the reference control parameters comprise at least one of the following parameters: the opening period of the tail exhaust valve and the duration of single opening; determining a control parameter correction value according to the actual reactor core humidity so as to correct the reference control parameter; and controlling the exhaust valve by using the corrected reference control parameter. According to the method, when the output power of the fuel cell system dynamically changes, the actual output power and the actual reactor core humidity of the fuel cell system can be combined to adaptively adjust the control parameters of the tail exhaust valve, so that the working condition requirements of the dynamic change of the output power of the fuel cell system can be better adapted, and the problems in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, specifically to a method for controlling exhaust emissions in a fuel cell system and a fuel cell system. Background Technology

[0002] As a highly efficient and clean energy conversion device, fuel cell systems directly convert the chemical energy of hydrogen and oxygen in the air into electrical energy through electrochemical reactions, thus showing broad application prospects in new energy vehicles, distributed power generation, and other fields. During the operation of a fuel cell system, electrochemical reactions continuously occur inside the stack. Hydrogen introduced to the anode side decomposes into protons and electrons under the action of a catalyst. Protons migrate through the proton exchange membrane to the cathode, while electrons generate current through the external circuit. Meanwhile, oxygen from the air introduced to the cathode side combines with protons and electrons under the action of a catalyst to form water. During this process, the fuel cell system produces exhaust gases, including unreacted residual gases (such as residual hydrogen, nitrogen, and carbon dioxide) and generated water vapor. If these exhaust gases are not discharged in a timely and appropriate manner, they will seriously affect the operating performance and stability of the fuel cell system.

[0003] As a core component for exhaust gas emission control in fuel cell systems, the tailpipe valve's main function is to control the timing and amount of exhaust gas emission through opening and closing actions, thereby regulating the internal pressure, humidity, and gas composition of the fuel cell system. Currently, the industry commonly employs a periodic control scheme for tailpipe valve control. This involves pre-setting fixed control parameters to ensure the tailpipe valve opens and closes according to a set cycle, with each opening lasting a constant duration. Specifically, technicians pre-set a fixed tailpipe cycle and a fixed opening duration based on the fuel cell system's design operating conditions. Under the controller's control, the tailpipe valve cyclically executes a "close - wait for fixed cycle - open for fixed duration - close" action sequence to achieve periodic exhaust gas emission.

[0004] However, in real-world applications, the output power of fuel cell systems is often in a dynamic state, and the amount of exhaust gas generated by different output powers varies significantly. The existing method of achieving periodic control by pre-setting fixed control parameters is difficult to adapt to the dynamic operating conditions of fuel cell system output power. Summary of the Invention

[0005] In view of the deficiencies in the existing technology, the purpose of this invention is to provide a method for controlling exhaust emissions of a fuel cell system and a fuel cell system, which aims to solve the technical problems in the related technology to a certain extent.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This application provides a method for controlling exhaust emissions in a fuel cell system, including:

[0008] Obtain the actual output power and actual core humidity of the fuel cell system;

[0009] The reference control parameters of the tailpipe valve are determined based on the actual output power, wherein the reference control parameters include at least one of the following: the opening cycle of the tailpipe valve and the duration of a single opening.

[0010] The control parameter correction value is determined by the actual core humidity, and is used to correct the baseline control parameter.

[0011] The tail valve is controlled using the corrected reference control parameters.

[0012] Preferably, the method further includes: pre-dividing the output power of the fuel cell system into multiple power segments, and assigning corresponding control parameters to each power segment; and,

[0013] The baseline control parameters of the tailpipe valve are determined based on the actual output power, specifically including:

[0014] Determine the target power range to which the actual output power belongs;

[0015] Obtain the control parameters corresponding to the target power range, and use them as the reference control parameters.

[0016] Preferably, the actual core humidity is obtained in the following manner:

[0017] The actual internal resistance of the fuel cell stack core of the fuel cell system was measured using an internal resistance measuring device.

[0018] The actual core humidity of the fuel cell system is estimated based on the actual internal resistance and the calibration relationship between the internal resistance and the core humidity.

[0019] Preferably, the method further includes:

[0020] According to a preset humidity gradient, the core humidity of the fuel cell system stack is sequentially adjusted to multiple target humidity values, and the internal resistance of the stack core is measured by the internal resistance measuring device at each target humidity value.

[0021] Based on each target humidity value and its corresponding internal resistance, a calibration relationship between the internal resistance and the core humidity is established through curve fitting.

[0022] Preferably, determining the control parameter correction value based on the actual core humidity specifically includes:

[0023] The actual core humidity is substituted into the correspondence model between the correction value and the core humidity to obtain the control parameter correction value that matches the actual core humidity. The correspondence model is used to characterize the mapping relationship between the core humidity and the control parameter correction value.

[0024] Preferably, the method further includes pre-constructing the correspondence model in the following manner:

[0025] When the fuel cell system is in a stable operating condition, for multiple different target core humidity values, the control parameter correction values ​​required to maintain the core humidity within the ideal humidity range are determined respectively.

[0026] Based on the multiple different target core humidity values ​​and their corresponding control parameter correction values, the corresponding relationship model is established.

[0027] Preferably, the correspondence model is a preset mathematical function model or parameter mapping table.

[0028] Preferably, the actual output power is obtained in the following manner:

[0029] Obtain the actual output current and actual output voltage of the fuel cell system;

[0030] The actual output power is calculated using the actual output current and the actual output voltage.

[0031] Preferably, the corrected reference control parameter is the sum of the reference control parameter and the control parameter correction value.

[0032] This application also provides a fuel cell system in which the exhaust valve is controlled by the method provided in this application.

[0033] Based on the above technical solution, the advantages of the present invention compared with the prior art are as follows:

[0034] The tailpipe control method for a fuel cell system provided in this application includes acquiring the actual output power and actual core humidity of the fuel cell system, then determining the reference control parameters of the tailpipe valve based on the actual output power. These reference control parameters include at least one of the following: the opening cycle of the tailpipe valve and the duration of a single opening. Then, a correction value for the control parameters is determined using the actual core humidity to correct the reference control parameters. Finally, the tailpipe valve is controlled using the corrected reference control parameters. This method can adaptively adjust the control parameters of the tailpipe valve by combining the actual output power and actual core humidity of the fuel cell system when the output power of the fuel cell system changes dynamically, thereby better adapting to the operating conditions of dynamically changing fuel cell system output power and solving the problems in the prior art. Attached Figure Description

[0035] Figure 1 This is a schematic flowchart illustrating the exhaust control method for a fuel cell system provided in this application embodiment. Detailed Implementation

[0036] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] As mentioned earlier, the industry currently generally adopts a periodic control scheme for tailpipe valves. This involves using preset fixed control parameters to make the tailpipe valve open and close according to a set cycle, with each opening lasting a constant duration. However, in real-world applications, the output power of fuel cell systems is often dynamically changing, and the amount of exhaust gas produced varies significantly depending on the output power. The existing method of achieving periodic control through preset fixed parameters is ill-suited to the dynamic operating conditions required by fuel cell systems with varying output power.

[0040] Based on this, embodiments of this application provide a fuel cell system exhaust control method and a fuel cell system, which can be used to solve the problems in the prior art. For example... Figure 1 The diagram shown illustrates the specific flow of this exhaust control method, which includes the following steps:

[0041] Step S11: Obtain the actual output power and actual core humidity of the fuel cell system.

[0042] This fuel cell system may include a stack, a hydrogen subsystem, an air subsystem, and a cooling subsystem. The stack is where hydrogen and oxygen from the air undergo a redox reaction to generate electricity. The hydrogen subsystem supplies hydrogen to the stack, the air subsystem supplies air to the stack, and the cooling subsystem supplies circulating cooled water to the stack to control the reaction temperature. In practical applications, the stack is equipped with a tailpipe valve, which allows for the periodic opening of the tailpipe valve during operation to discharge exhaust gases and water (including water droplets and water vapor) generated during the fuel cell reaction.

[0043] Current tailpipe valve control methods rely on preset, fixed control parameters to periodically open and close the valve. This approach is clearly ill-suited to adapting to constantly changing operating conditions. This application addresses this issue by dynamically controlling the tailpipe valve's opening cycle and the duration of each opening.

[0044] The inventors of this application have discovered through research that the actual output power of a fuel cell system has a significant impact on the generation rate of exhaust gas and water. For example, the higher the actual output power, the greater the amount of hydrogen and oxygen reacting, resulting in more exhaust gas and water being generated. In other words, the generation rate of exhaust gas and water will be relatively higher, which directly affects the opening cycle and duration of a single opening of the exhaust valve. In addition, the inventors of this application have also discovered through research that the core humidity of the fuel cell stack directly reflects the water management status inside the stack. Therefore, the core humidity affects the exhaust gas and water discharge requirements. For example, the higher the core humidity, the higher the water content of the stack core, and the greater the need to exhaust gas by opening the exhaust valve. Conversely, the lower the core humidity, the lower the water content of the stack core, and the less the need to exhaust gas by opening the exhaust valve. The core humidity can typically be the humidity of the gas in the air channel of the fuel cell core or the humidity of the gas in the hydrogen channel. Of course, considering that the water produced by the reaction of hydrogen and air is mainly on the cathode side, the humidity of the gas in the air channel is more in line with the actual situation. The core humidity is preferably the humidity of the gas in the air channel of the fuel cell core.

[0045] Therefore, in the subsidy S11 of this application, the actual output power and actual core humidity of the fuel cell system can be obtained. There are multiple ways to obtain the actual output power. For example, the actual output current and actual output voltage of the fuel cell system can be obtained through current and voltage sensors, and then the actual output power can be calculated. Alternatively, the actual output power can be obtained through other methods.

[0046] In this application, considering that the core of the fuel cell stack is a sealed structure, it is usually difficult to directly measure its actual core humidity. Therefore, in step S11, the actual core humidity of the fuel cell system (referring to the core humidity of the fuel cell stack) can be indirectly obtained in the following way: Specifically, the actual internal resistance of the fuel cell stack core can be measured by an internal resistance measuring device, and then the actual core humidity of the fuel cell system can be estimated based on the actual internal resistance and the calibration relationship between the internal resistance and the core humidity.

[0047] This indirect method of obtaining the actual core humidity utilizes the calibration relationship between internal resistance and core humidity. Generally speaking, higher core humidity indicates higher water content, resulting in a relatively lower internal resistance of the fuel cell stack. Conversely, lower core humidity indicates lower water content, resulting in a relatively higher internal resistance. In this application, this principle can be used to pre-determine the calibration relationship between internal resistance and core humidity. Thus, in step S11, the actual internal resistance of the fuel cell stack core can be obtained first, and then, combined with this actual internal resistance and the calibration relationship, the actual core humidity of the fuel cell system can be estimated.

[0048] The actual internal resistance of the fuel cell stack core can be measured using an internal resistance measuring device. For example, in practical applications, this internal resistance measuring device (a circuit element for measuring resistance) can be integrated into a CVM (voltage monitor). Then, while measuring the voltage of each cell in the stack using the CVM, the actual internal resistance of the stack core can be measured simultaneously. This actual internal resistance can then be substituted into the calibration relationship between the internal resistance and the core humidity to calculate the actual core humidity of the fuel cell system.

[0049] In practical applications, it is usually necessary to use a CVM to monitor the voltage of each cell in the stack core (the stack core is composed of multiple cells stacked together) in real time to monitor whether a fault has occurred. Therefore, in this application, the internal resistance measuring device can be integrated into the CVM, so that the actual internal resistance of the stack core can be measured simultaneously while the voltage of each cell in the stack is measured using the CVM.

[0050] In this application, the calibration relationship between internal resistance and core humidity can be established in advance in the following way: Specifically, the core humidity of the fuel cell system stack can be adjusted to multiple target humidity values ​​sequentially according to a preset humidity gradient, and the internal resistance of the stack core can be measured by the internal resistance measuring device at each target humidity value. For example, if the humidity gradient is a, the core humidity of the fuel cell system stack can be adjusted to the first target humidity value M, and the internal resistance R1 of the stack core can be measured by the internal resistance measuring device at the first target humidity value M. Then, the core humidity of the fuel cell system stack can be adjusted to the second target humidity value Ma, and the internal resistance R2 of the stack core can be measured by the internal resistance measuring device at the second target humidity value Ma. And so on, the core humidity of the fuel cell system stack can be adjusted to the nth target humidity value M-(n-1)a, and the internal resistance Rn of the stack core can be measured by the internal resistance measuring device at the nth target humidity value M-(n-1)a.

[0051] After obtaining the target humidity values ​​and their corresponding internal resistances, a calibration relationship between the internal resistance and the core humidity can be established through curve fitting based on these values. For example, if multiple sets of data are obtained, such as (M, R1), (M-(n-1)a, R2), ..., (M-(n-1)a, Rn), then internal resistance can be used as the dependent variable and humidity as the independent variable to perform curve fitting and obtain the calibration relationship between the internal resistance and the core humidity. Therefore, in step S11, after measuring the actual internal resistance of the fuel cell stack core using an internal resistance measuring device, this actual internal resistance can be substituted into the calibration relationship to estimate the actual core humidity of the fuel cell system.

[0052] Step S12: Determine the reference control parameters of the tailpipe valve based on the actual output power.

[0053] In this application, when more exhaust is required, one approach is to reduce the opening cycle of the exhaust valve (thereby increasing the opening frequency of the exhaust valve), and another approach is to increase the duration of a single opening of the exhaust valve. Alternatively, both the opening cycle and the duration of a single opening can be increased. Similarly, when less exhaust is required, one approach is to increase the opening cycle of the exhaust valve (thereby reducing the opening frequency of the exhaust valve), and another approach is to decrease the duration of a single opening of the exhaust valve. Again, both the opening cycle and the duration of a single opening can be increased. Therefore, in this application, exhaust control of the exhaust valve can be achieved by controlling both the opening cycle and the duration of a single opening. In other words, the baseline control parameters in this application include at least one of the following: the opening cycle of the exhaust valve and the duration of a single opening.

[0054] In this application, it was mentioned above that the actual output power of the fuel cell system has a significant impact on the generation rate of exhaust gas and water. Therefore, step S12 can be implemented in the following way: Specifically, the output power of the fuel cell system can be divided into multiple power segments in advance, and corresponding control parameters can be assigned to each power segment. In this way, step S12 can first determine the target power segment to which the actual output power belongs, and then obtain the control parameters corresponding to the target power segment as the reference control parameters.

[0055] For example, based on the normal startup and operation of a fuel cell system, its operating conditions can usually be divided into idling, low-power, medium-power, and high-power stages. The power of these different stages has its own characteristics. Generally speaking, the power of the idling stage is less than 5% of the rated power (called P) of the fuel cell system, the power of the low-power stage is between 5% and 30% of the rated power P, the power of the medium-power stage is between 30% and 80% of the rated power P, and the power of the high-power stage is greater than 80% of the rated power P. Based on this, in practical applications, the output power of the fuel cell system can be pre-divided into four power segments: (0, P×5%), (P×5%, P×30%), (P×30%, P×80%), and greater than P×80%. Corresponding control parameters are then assigned to each of these four power segments. For example, the control parameters for the power segment (0, P×5%) include an opening cycle of 90 seconds for the exhaust valve and a single opening duration of 5 milliseconds; for the power segment (P×5%, P×30%), the control parameters include an opening cycle of 60 seconds for the exhaust valve and a single opening duration of 8 milliseconds; for the power segment (P×30%, P×80%), the control parameters include an opening cycle of 35 seconds for the exhaust valve and a single opening duration of 13 milliseconds; and for the power segment greater than P×80%, the control parameters include an opening cycle of 15 seconds for the exhaust valve and a single opening duration of 20 milliseconds.

[0056] After dividing the power into these four power segments and assigning corresponding control parameters to each power segment, in step S12, the target power segment to which the actual output power belongs can be determined, and then the control parameters corresponding to the target power segment can be obtained as the reference control parameters.

[0057] Of course, in practical applications, other power segment division methods can be adopted as needed, such as dividing into 3 power segments, 5 power segments, etc. There are no specific limitations on the number of power segments or the power of each power segment.

[0058] Step S13: Determine the control parameter correction value based on the actual core humidity to correct the baseline control parameters.

[0059] As mentioned above, the inventors of this application discovered through research that the actual output power of a fuel cell system has a significant impact on the generation rate of exhaust gas and water. Furthermore, the core humidity of the fuel cell stack directly reflects the internal water management status of the stack, thus affecting the exhaust gas and water discharge requirements. Therefore, this application determines the baseline control parameters of the exhaust valve based on the actual output power. Then, based on these baseline control parameters, a correction value for the control parameters is determined using the actual core humidity. This corrects the baseline control parameters, enabling the final control parameters—the corrected baseline control parameters—to be determined comprehensively from both the output power and the internal water management status of the fuel cell stack, thereby achieving precise control of the exhaust valve.

[0060] In this application, the control parameter correction value can be determined in the following way: Specifically, the actual core humidity can be substituted into the correspondence model between the correction value and the core humidity to obtain the control parameter correction value that matches the actual core humidity. The correspondence model is used to characterize the mapping law between the core humidity and the control parameter correction value. In practical applications, the form of the correspondence model can be a preset mathematical function model or a parameter mapping table.

[0061] In this application, a quantitative relationship model between fuel cell core humidity and tailpipe valve control parameter correction value can be established in advance through systematic experiments. The basic principle is to actively adjust the core humidity while keeping other operating conditions stable, and simultaneously observe and record the amount of correction to the tailpipe valve reference parameter required to maintain ideal humidity, thereby determining the mapping law between core humidity and tailpipe valve control parameter correction value.

[0062] Therefore, in this application, the correspondence model can be constructed in advance in the following way: for example, when the fuel cell system is in a stable operating condition, for multiple different target core humidity values, the control parameter correction values ​​required to maintain the core humidity in the ideal humidity range can be determined respectively, and then the correspondence model can be established based on multiple different target core humidity values ​​and their corresponding control parameter correction values.

[0063] The term "stable operating condition" for this fuel cell system refers to adjusting and stabilizing the system at a representative operating point. For example, maintaining a constant stack temperature of 70°C, an anode pressure of 150 kPa, a cathode pressure of 120 kPa, and a fixed output power of 50% of the rated power. At this point, the fuel cell system's output power, operating temperature, and hydrogen and air pressures are relatively stable, thus indicating that it is in a stable operating condition.

[0064] When the fuel cell system is in a stable operating condition, for multiple different target core humidity values, the control parameter correction values ​​required to maintain the core humidity within the ideal humidity range are determined. For example, under the current stable humidity, the control parameters (opening cycle or duration) of the tailpipe valve are finely adjusted based on the corresponding baseline control parameters to find the actual parameter value that can stabilize the core humidity within the ideal range (e.g., 50%RH-70%RH). Then, based on the deviation between the actual parameter value and the baseline control parameter, the control parameter correction value required to maintain the core humidity within the ideal humidity range is obtained. After obtaining multiple different target core humidity values ​​and their corresponding control parameter correction values, curve fitting can be further performed to obtain a preset mathematical function model, or a parameter mapping table can be used to finally obtain the corresponding relationship model.

[0065] Thus, after obtaining the correspondence model, in step S13, the actual core humidity can be substituted into the correspondence model to calculate the control parameter correction value. Then, the control parameter correction value is used to correct the baseline control parameter to obtain the corrected baseline control parameter. For example, the corrected baseline control parameter can be the sum of the control parameter correction value and the baseline control parameter.

[0066] Step S14: Control the tail valve using the corrected reference control parameters.

[0067] After obtaining the corrected reference control parameters through the above step S13, the tail valve can be directly controlled using the corrected reference control parameters. For example, the tail valve can be directly controlled using the corrected reference control parameters, or the tail valve can be adjusted from the current control parameters to the corrected reference control parameters using PID control.

[0068] The tailpipe control method for a fuel cell system provided in this application includes acquiring the actual output power and actual core humidity of the fuel cell system, then determining the reference control parameters of the tailpipe valve based on the actual output power. These reference control parameters include at least one of the following: the opening cycle of the tailpipe valve and the duration of a single opening. Then, a correction value for the control parameters is determined using the actual core humidity to correct the reference control parameters. Finally, the tailpipe valve is controlled using the corrected reference control parameters. This method can adaptively adjust the control parameters of the tailpipe valve by combining the actual output power and actual core humidity of the fuel cell system when the output power of the fuel cell system changes dynamically, thereby better adapting to the operating conditions of dynamically changing fuel cell system output power and solving the problems in the prior art.

[0069] Based on the exhaust control method for the fuel cell system provided in the embodiments of this application, the embodiments of this application can also provide a fuel cell system in which the exhaust valve is controlled by the exhaust control method provided in the embodiments of this application, thus solving the problems in the prior art, which will not be elaborated here.

[0070] This invention is not limited to the embodiments described above. Those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention. Contents not described in detail in this specification are prior art known to those skilled in the art.

Claims

1. A method of tailpipe control of a fuel cell system, characterized by, The method comprises: acquiring an actual output power and an actual core humidity of a fuel cell system; determining a reference control parameter of a tail exhaust valve according to the actual output power, wherein the reference control parameter comprises at least one of an opening period and a single opening duration of the tail exhaust valve; determining a control parameter correction value for correcting the reference control parameter according to the actual core humidity; and controlling the tail exhaust valve by using the corrected reference control parameter.

2. The tailpipe emission control method according to claim 1, characterized by, The method further comprises: dividing the output power of the fuel cell system into a plurality of power segments in advance, and assigning a corresponding control parameter to each power segment; and The method further comprises: determining a target power segment to which the actual output power belongs; and acquiring a control parameter corresponding to the target power segment as the reference control parameter.

3. The tailpipe emission control method according to claim 1, characterized by, The actual core humidity is acquired by: measuring an actual internal resistance of a stack core of the fuel cell system by using an internal resistance measuring device; and estimating the actual core humidity of the fuel cell system according to the actual internal resistance and a calibration relationship between the internal resistance and the core humidity.

4. The tailpipe emission control method according to claim 3, characterized by The method further comprises: adjusting the core humidity of the stack of the fuel cell system to a plurality of target humidity values in sequence according to a preset humidity gradient, and measuring the internal resistance of the stack core by using the internal resistance measuring device at each target humidity value; and establishing the calibration relationship between the internal resistance and the core humidity by curve fitting based on each target humidity value and the corresponding internal resistance.

5. The tailpipe emission control method according to claim 1, characterized by, The control parameter correction value is determined according to the actual core humidity by: substituting the actual core humidity into a corresponding relationship model between the core humidity and the control parameter correction value to obtain a control parameter correction value matched with the actual core humidity, wherein the corresponding relationship model is used to represent a mapping rule between the core humidity and the control parameter correction value.

6. The tailpipe emission control method according to claim 5, characterized by The method further comprises constructing the corresponding relationship model in advance by: determining the control parameter correction value required for maintaining the core humidity in an ideal humidity interval for a plurality of different target core humidity values when the fuel cell system is in a stable working condition; and establishing the corresponding relationship model based on the plurality of different target core humidity values and the corresponding control parameter correction values.

7. The tailpipe emission control method according to claim 6, characterized by, The corresponding relationship model is specifically a preset mathematical function model or a parameter mapping table.

8. The tailpipe emission control method according to claim 1, characterized by, The actual output power is acquired by: acquiring an actual output current and an actual output voltage of the fuel cell system; and calculating the actual output power by using the actual output current and the actual output voltage.

9. The tailpipe emission control method according to claim 1, characterized by, The corrected reference control parameter is specifically a sum of the reference control parameter and the control parameter correction value.

10. A fuel cell system characterized by comprising: The tail exhaust valve of the fuel cell system is controlled by the method according to any one of claims 1 to 9.

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