Water temperature adjusting method and device of fuel cell system and vehicle

Abstract

The invention provides a water temperature adjusting method and device of a fuel cell system and a vehicle, the method is applied to the field of fuel cell systems, and the method comprises the following steps: acquiring a rising rate mean value of high-frequency impedance of the fuel cell system in multiple historical purging stages; determining a target control parameter for maintaining the dry-wet state of the fuel cell system in a target state based on the rising rate mean value of the high-frequency impedance and the reference rate mean value; and adjusting the water temperature of the fuel cell system in the operation stage based on the target control parameter. According to the method, the target control parameter for maintaining the dry-wet state of the fuel cell system in the target state can be determined according to the rising rate mean value of the high-frequency impedance and the reference rate mean value, and the water temperature of the fuel cell system in the operation stage is adjusted based on the target control parameter, so that the stack is kept in a relatively ideal dry-wet state for a relatively long time; the performance and the service life of the fuel cell are improved.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more specifically, to a method, apparatus, and vehicle for regulating the water temperature of a fuel cell system in the field of fuel cell systems. Background Technology

[0002] Fuel cells are devices that directly convert chemical energy into electrical energy, and are widely used in automobiles, portable power supplies, and stationary power stations. Among them, proton exchange membrane fuel cells are one of the most promising applications due to their high efficiency and low emissions. However, to ensure the stable operation and long-term durability of the fuel cell system, proper management of water circulation within the fuel cell stack is essential.

[0003] Current technology uses online impedance measurements at different excitation frequencies to determine the wet / dry state of the membrane, thereby adjusting the operating conditions to restore the membrane's water balance to a normal state. However, online impedance measurement is achieved through DC-DC converters, and the consistency and error of these measurements are difficult to guarantee during mass production. Consequently, the results cannot support precise adjustment of membrane water management, leading to a decline in fuel cell performance. Summary of the Invention

[0004] This application provides a water temperature regulation method, device, and vehicle for a fuel cell system. The method can determine the target control parameters for maintaining the dry and wet state of the fuel cell system in the target state during the current purging stage based on the average rise rate of the high-frequency impedance and the average reference rate. Based on the target control parameters, the water temperature of the fuel cell system during operation is adjusted so that the stack can be maintained in a relatively ideal dry and wet state for a longer period of time, thereby improving the performance and service life of the fuel cell.

[0005] In a first aspect, a method for regulating the water temperature of a fuel cell system is provided. The method includes: acquiring the average rate of rise of high-frequency impedance of the fuel cell system during multiple historical purging phases; determining target control parameters for maintaining the dry and wet states of the fuel cell system in a target state based on the average rate of rise of the high-frequency impedance and the average rate of reference; and regulating the water temperature of the fuel cell system during operation based on the target control parameters.

[0006] Through the above technical solution, the embodiments of this application can determine the target control parameters for maintaining the dry and wet state of the fuel cell system in the target state based on the average rise rate of the high-frequency impedance and the average reference rate; and adjust the water temperature of the fuel cell system during operation based on the target control parameters, so that the stack can be kept in a relatively ideal dry and wet state for a longer period of time, thereby improving the performance and service life of the fuel cell.

[0007] In conjunction with the first aspect, in some possible implementations, determining the target control parameters for maintaining the dry and wet states of the fuel cell system in the target state based on the average rise rate and the average reference rate of the high-frequency impedance includes: calculating the difference between the average rise rate and the average reference rate; and determining the target correction value for the target water temperature corresponding to each current based on the difference.

[0008] Through the above technical solution, the embodiments of this application can calculate the difference between the average rise rate and the average reference rate; based on the difference, the target correction value of the target water temperature corresponding to each current is determined, so that the subsequent control target parameters can approach the target control parameters of the initial operation stage, thereby improving the performance and service life of the fuel cell.

[0009] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the step of determining the target correction value of the target water temperature corresponding to each current based on the difference includes: obtaining a correspondence table between the difference and the target correction value; and determining the target correction value of the target water temperature corresponding to each current based on the correspondence table and the difference.

[0010] Through the above technical solution, the embodiments of this application can obtain a correspondence table between the difference and the target correction value; based on the correspondence table and the difference, the target correction value of the target water temperature under each current is determined, so as to facilitate the subsequent dynamic adjustment of the target control parameters, thereby enabling the stack to maintain a relatively ideal dry and wet state for a longer period of time, and improving the performance and service life of the fuel cell.

[0011] In combination with the first aspect and the above implementation methods, in some possible implementation methods, adjusting the water temperature of the fuel cell system during operation based on the target control parameters includes: correcting the corresponding target water temperature according to the target correction value under each current; and adjusting the water temperature of the fuel cell system during operation based on the corrected target water temperature under each current.

[0012] Through the above technical solution, the embodiments of this application can adjust the water temperature of the fuel cell system during operation based on the target water temperature corrected under various currents, thereby adjusting the target water temperature according to the dry and wet state of the fuel cell and avoiding the impact of humidity changes.

[0013] In combination with the first aspect and the above implementation methods, in some possible implementation methods, before adjusting the water temperature of the fuel cell system during the operation phase based on the target water temperature corrected under each current, the method further includes: obtaining the water temperature range of the fuel cell system; and correcting the target water temperature according to the water temperature range.

[0014] Through the above technical solution, the embodiments of this application can obtain the water temperature range of the fuel cell system; correct the target water temperature according to the water temperature range to avoid exceeding the operating water temperature range of the fuel cell system, thereby improving the performance and service life of the fuel cell.

[0015] In combination with the first aspect and the above implementation, in some possible implementations, before obtaining the average rate of rise of the high-frequency impedance of the fuel cell system in multiple historical purging phases, the method further includes: identifying the current number of purgings of the fuel cell system; if the current number of purgings is greater than a first preset number, then obtaining the average rate of rise of the high-frequency impedance of the fuel cell system in multiple historical purging phases.

[0016] Through the above technical solution, the embodiments of this application can identify the current number of purging cycles of the fuel cell system; if the current number of purging cycles is greater than the first preset number, the average rate of rise of high-frequency impedance of the fuel cell system in multiple historical purging stages is obtained, which can ensure that the rate of rise of high-frequency impedance in subsequent purging stages is consistent with the initial purging state, thereby keeping the stack in a relatively ideal dry and wet state for a longer period of time, improving the performance and service life of the fuel cell.

[0017] In combination with the first aspect and the above implementation, in some possible implementations, before determining the target control parameters for maintaining the dry and wet states of the fuel cell system in the target state based on the average rise rate of the high-frequency impedance and the average reference rate, the method further includes: acquiring the rise rate of the fuel cell system for a second preset number of times starting from the target period; and determining the average reference rate based on the average rise rate of the second preset number of times.

[0018] Through the above technical solution, the embodiments of this application can determine the average reference rate based on the average rise rate of the second preset number of times, thereby improving the accuracy of subsequent adjustment of the target control parameters.

[0019] Combining the first aspect and the above implementation methods, in some possible implementation methods, the rise rate is calculated based on the change in high-frequency impedance during the purging phase and the purging duration.

[0020] Secondly, a water temperature regulation device for a fuel cell system is provided. The device includes: an acquisition module for acquiring the average rise rate of the high-frequency impedance of the fuel cell system during multiple historical purging phases; a processing module for determining target control parameters for maintaining the dry and wet states of the fuel cell system in a target state based on the average rise rate of the high-frequency impedance and the average reference rate; and an adjustment module for adjusting the water temperature of the fuel cell system during operation based on the target control parameters.

[0021] Thirdly, a vehicle is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the water temperature regulation method for a fuel cell system as described in the above embodiments. Attached Figure Description

[0022] Figure 1 This is a flowchart of the water temperature regulation method for a fuel cell system provided in the embodiments of this application;

[0023] Figure 2 This is a schematic diagram of the water temperature regulation device of the fuel cell system provided in the embodiments of this application;

[0024] Figure 3 This is a schematic diagram of the vehicle structure provided in the embodiments of this application.

[0025] Figure description: purge control device 10, acquisition module 100, processing module 200 and adjustment module 300. Detailed Implementation

[0026] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0027] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0028] Traditional online impedance measurement technology is an effective way to evaluate the dry and wet state of a proton exchange membrane (PEM) using a DC / DC converter. This technology uses an AC signal to excite the PEM and calculates the impedance by measuring the voltage and current across the membrane. By analyzing impedance changes at different frequencies, the dry and wet state of the membrane can be assessed. The DC / DC converter generates the AC excitation signal and superimposes it onto a DC signal, while simultaneously measuring the voltage and current signals. Using a DC / DC converter, impedance measurements can be performed without interrupting the normal operation of the fuel cell system.

[0029] Specifically, it consists of the following steps:

[0030] Step 1, Excitation signal generation:

[0031] A DC / DC converter generates an AC excitation signal through a control circuit. The frequency of the AC excitation signal can vary from hundreds of hertz to thousands of hertz to cover different frequency ranges.

[0032] Step 2, Exchange and Overlay:

[0033] The AC excitation signal is superimposed on the DC output voltage of the fuel cell system; this allows impedance measurement to be performed without affecting the normal operation of the system.

[0034] Step 3, voltage and current measurement:

[0035] The built-in sensors of the DC / DC converter measure the superimposed voltage and current signals; the voltage and current signals are acquired and processed by the converter's control circuit.

[0036] Step 4, Impedance Calculation:

[0037] The impedance is calculated based on the measured voltage and current signals. The impedance can be expressed by the formula:

[0038] Z = V / I, where V is voltage and I is current.

[0039] Step 5, Data Analysis:

[0040] The impedance changes at different frequencies are analyzed to assess the dry and wet states of the membrane. Generally, the impedance changes at high frequencies mainly reflect the resistive characteristics of the membrane, while the impedance changes at low frequencies reflect the capacitive effect within the membrane more.

[0041] Step 6, Dynamic Adjustment:

[0042] Based on impedance measurement results, the operating conditions of the fuel cell system are dynamically adjusted to ensure that the membrane is always in the optimal moisture balance state.

[0043] The above solutions cannot adjust the dry or wet state of the membrane under fixed operating conditions, which leads to performance degradation; they rely on instantaneous operating conditions, cannot accurately determine the dry or wet state of the membrane, and cannot avoid the impact of humidity changes.

[0044] Therefore, this application solves the following problems by calculating the rate of change of high-frequency impedance to correct the operating water temperature and thus changing the wet / dry state of the membrane:

[0045] 1. Under fixed operating conditions, the membrane's dry or wet state cannot be adjusted, leading to a decrease in performance;

[0046] 2. Without relying on instantaneous operating conditions, the dry and wet state of the membrane can be judged from the long-term trend of the high-frequency impedance rate change during purging, and the water temperature can be adjusted accordingly to change the dry and wet change trend.

[0047] 3. It does not rely on a humidity sensor, thus avoiding the effects of humidity changes.

[0048] Figure 1 This is a flowchart of a water temperature regulation method for a fuel cell system provided in an embodiment of this application.

[0049] For example, such as Figure 1 As shown, the method includes the following steps:

[0050] Step S101: Obtain the average rate of rise of high-frequency impedance of the fuel cell system during multiple historical purging phases.

[0051] The rise rate is calculated based on the change in high-frequency impedance during the purging phase and the purging duration.

[0052] It is understood that the embodiments of this application can obtain the average rate of rise of high-frequency impedance of the fuel cell system during multiple historical purging phases, so as to subsequently determine the target control parameters for maintaining the dry and wet states of the fuel cell system in the target state.

[0053] It should be noted that the fuel cell system of this application includes a purging phase during shutdown. This phase has fixed purging conditions, including current, water temperature, and purging flow rate. A fixed-frequency high-frequency impedance measurement is performed, and the purging endpoint is set to a fixed high-frequency impedance value. The high-frequency impedance is referred to as HFR in this application.

[0054] Specifically, during the purging process, the initial high-frequency impedance value R1 is recorded. This high-frequency impedance value needs to undergo certain filtering processing, such as the 12-point filtering method. Then, the value R2 at the end of the purging process is recorded, along with the purging duration t. The rise rate of the high-frequency impedance is then calculated using the formula: Rv = (R2 - R1) / t, where t is the purging duration, R1 is the initial high-frequency impedance, and R2 is the high-frequency impedance at the end of the purging process. The fuel cell system controller writes this Rv value into the epprom and reads it during the next run.

[0055] In this embodiment of the application, before obtaining the average rate of rise of the high-frequency impedance of the fuel cell system in multiple historical purging stages, the method further includes: identifying the current number of purgings of the fuel cell system; if the current number of purgings is greater than a first preset number, then obtaining the average rate of rise of the high-frequency impedance of the fuel cell system in multiple historical purging stages.

[0056] The first preset number of times can be 5 or 7 times, which can be set according to actual needs without specific limitations.

[0057] It is understood that the embodiments of this application can identify the current number of purgings of the fuel cell system; if the current number of purgings is greater than the first preset number, the average rate of rise of the high-frequency impedance of the fuel cell system in multiple historical purging stages is obtained, which can ensure that the rate of rise of the high-frequency impedance in subsequent purging stages is consistent with the initial purging state, thereby keeping the stack in a relatively ideal dry and wet state for a longer period of time, improving the performance and service life of the fuel cell.

[0058] It should be noted that during the next purging phase, the fuel cell system calculates the average Rv value of the past x shutdowns, denoted as Rv_mean_act, where x can be calibrated, for example: x≥5.

[0059] Step S102: Based on the average rise rate of the high-frequency impedance and the average reference rate, determine the target control parameters for maintaining the dry and wet states of the fuel cell system in the target state.

[0060] It is understood that the embodiments of this application can determine the target control parameters for maintaining the dry and wet states of the fuel cell system in the target state based on the average rise rate of the high-frequency impedance and the average reference rate, so as to facilitate subsequent adjustment of the water temperature during the operation of the fuel cell system based on the target control parameters.

[0061] In this embodiment of the application, before determining the target control parameters for maintaining the dry and wet states of the fuel cell system in the target state based on the average rise rate of the high-frequency impedance and the average reference rate, the method further includes: obtaining the rise rate of the fuel cell system for a second preset number of times starting from the target period; and determining the average reference rate based on the average rise rate of the second preset number of times.

[0062] The second preset number of times can be 5 or 6 times, and the target period can be the initial operation period of the fuel cell or the period after it is taken off the production line. It can be set according to actual needs and is not specifically limited.

[0063] It is understood that the embodiments of this application can determine the average reference rate based on the average rate of the second preset number of rises, thereby improving the accuracy of subsequent adjustment of the target control parameters.

[0064] It should be noted that this application calculates the average Rv value of the first 5 shutdowns during the initial operation or shutdown period of the fuel cell. This value is denoted as Rv_mean_in i, to provide a reference average rate for the fuel cell in the initial stage.

[0065] In this embodiment, the target control parameters for maintaining the dry and wet states of the fuel cell system in the target state are determined based on the average rise rate of the high-frequency impedance and the average reference rate, including: calculating the difference between the average rise rate and the average reference rate; and determining the target correction value of the target water temperature corresponding to each current based on the difference.

[0066] It is understood that the embodiments of this application calculate the difference between the average rise rate and the average reference rate; based on the difference, the target correction value of the target water temperature corresponding to each current is determined so that the subsequent control target parameters can approach the target control parameters of the initial operation stage, thereby improving the performance and service life of the fuel cell.

[0067] Specifically, since the mean reference rate is Rv_mean_in i and the mean rise rate is Rv_mean_act, the difference between the mean rise rate and the mean reference rate is Rv_err = Rv_mean_act - Rv_mean_in i.

[0068] In this embodiment of the application, the target correction value for the target water temperature under each current can be determined based on the difference, including: obtaining a correspondence table between the difference and the target correction value; and determining the target correction value for the target water temperature under each current based on the correspondence table and the difference.

[0069] It is understood that the embodiments of this application can obtain a correspondence table between the difference and the target correction value; based on the correspondence table and the difference, the target correction value of the target water temperature under each current is determined, so as to facilitate the subsequent dynamic adjustment of the target control parameters, thereby keeping the stack in a relatively ideal dry and wet state for a longer period of time, and improving the performance and service life of the fuel cell.

[0070] For example, taking the difference between the average rise rate and the average reference rate as Rv_err, we can look up the correspondence table between the difference and the target correction value to determine the target correction value of the target water temperature as Ti. The correspondence table between the difference and the target correction value can be labeled, and the values ​​in the table need to be constrained to upper and lower limits to avoid exceeding the water temperature range allowed by the system.

[0071] Step S103: Adjust the water temperature of the fuel cell system during operation based on the target control parameters.

[0072] It is understood that the embodiments of this application adjust the water temperature during the operation of the fuel cell system based on target control parameters, thereby keeping the fuel cell stack in a relatively ideal dry and wet state for a longer period of time, improving the performance and service life of the fuel cell.

[0073] In this embodiment, controlling the operation of the fuel cell system based on target control parameters includes: correcting the corresponding target water temperature according to the target correction value under each current; and adjusting the water temperature of the fuel cell system during operation based on the corrected target water temperature under each current.

[0074] It is understood that the embodiments of this application can correct the corresponding target water temperature according to the target correction value under each current; purge is performed based on the corrected target water temperature under each current, so as to adjust the target water temperature according to the dry and wet state of the fuel cell, avoid the impact of humidity changes, and improve the performance and service life of the fuel cell.

[0075] In this embodiment of the application, before purging based on the target water temperature corrected for each current, the method further includes: obtaining the water temperature range of the fuel cell system; and correcting the target water temperature according to the water temperature range.

[0076] It is understood that the embodiments of this application can obtain the water temperature range of the fuel cell system; the target water temperature is corrected according to the water temperature range to avoid exceeding the operating water temperature range of the fuel cell system, thereby improving the performance and service life of the fuel cell.

[0077] It should be noted that the operating temperature range of a fuel cell system can be determined according to the specific model of different vehicles. For example, the operating temperature range of a proton exchange membrane fuel cell is usually 60°C to 80°C, without any specific limitation.

[0078] For example, if the water temperature range of the fuel cell system is [60, 80] and the target water temperature is 90, then this exceeds the water temperature range of the fuel cell system, so the target water temperature is corrected to the maximum value of 80℃; if the target water temperature is 70℃, then no correction is needed; if the target water temperature is 55℃, then the target water temperature is corrected to the minimum value of 60℃.

[0079] According to the water temperature regulation method for fuel cell systems proposed in this application, the target control parameters for maintaining the dry and wet state of the fuel cell system in the target state are determined based on the average rise rate of high-frequency impedance and the average reference rate. The water temperature of the fuel cell system during operation is adjusted based on the target control parameters, so that the stack can be maintained in a relatively ideal dry and wet state for a longer period of time, thereby improving the performance and service life of the fuel cell.

[0080] The water temperature regulation method of the fuel cell system of this application will be described in detail below with specific embodiments. The specific steps are as follows:

[0081] Step 1: During the shutdown process of the fuel cell system, a purging phase is set. In this phase, the purging conditions are fixed, such as current, water temperature, temperature difference, and purging flow rate. A fixed frequency high-frequency impedance measurement is performed, and the purging endpoint is set to a fixed high-frequency impedance value.

[0082] Step 2: During the purging process, record the initial high-frequency impedance value R1 (this value needs to be filtered through a certain point, such as the 12-point filtering method), record the value R2 at the end of the purging, and record the purging duration t. Then the HFR rise rate Rv = (R2-R1) / t. The fuel cell system controller writes this Rv value into the epprom and reads it in the next run.

[0083] Step 3: During the initial operation or shutdown of the fuel cell, calculate the average Rv value of the first 5 shutdowns. This value is denoted as Rv_mean_in i.

[0084] Step 4: Subsequently, during the next run of the fuel cell system, the mean value of Rv for the past x (calibrable, x≥5) shutdowns is calculated and denoted as Rv_mean_act;

[0085] Based on the value of Rv_err (Rv_err = Rv_mean_act - Rv_mean), the target water temperature correction value Ti (i = 1, 2, 3...) for each current point is obtained by looking up the table. The table can be calibrated, and the values ​​in the table need to be constrained to upper and lower limits to avoid exceeding the water temperature range allowed by the system. The target water temperature is controlled and corrected based on this correction value, so that the HFR change rate during shutdown purging is consistent with the initial value, so that the fuel cell stack is always in a state of optimal water management and avoids the adverse effects of continuous dryness or wetness on the durability of the fuel cell stack.

[0086] In summary, this application addresses the problem of insufficient or excessive humidification capacity caused by environmental humidity to a certain extent. This is mainly achieved through the strategy described in the technical solution, which only considers the dry-wet trend changes of the membrane without considering the causes of these changes. This allows the membrane to maintain a relatively ideal water balance trend over a longer period of time, thereby mitigating the performance degradation caused by excessive dryness or wetness of the membrane.

[0087] Figure 2 This is a block diagram of a water temperature regulation device for a fuel cell system provided in an embodiment of this application.

[0088] For example, such as Figure 2 As shown, the water temperature regulation device 10 of the fuel cell system includes: an acquisition module 100, a processing module 200, and a regulation module 300.

[0089] The acquisition module 100 is used to acquire the average rate of rise of high-frequency impedance of the fuel cell system during multiple historical purging phases; the processing module 200 is used to determine the target control parameters for maintaining the dry and wet states of the fuel cell system in the target state based on the average rate of rise of high-frequency impedance and the average reference rate; and the adjustment module 300 is used to adjust the water temperature of the fuel cell system during operation based on the target control parameters.

[0090] According to the water temperature regulation device for the fuel cell system proposed in the embodiments of this application, the target control parameters for maintaining the dry and wet state of the fuel cell system in the target state are determined based on the average rise rate of the high-frequency impedance and the average reference rate; the water temperature of the fuel cell system during operation is adjusted based on the target control parameters, so that the stack can be maintained in a relatively ideal dry and wet state for a longer period of time, thereby improving the performance and service life of the fuel cell.

[0091] Figure 3 A schematic diagram of the structure of a vehicle provided in an embodiment of this application. The vehicle may include:

[0092] The memory 301, the processor 302, and the computer program stored on the memory 301 and capable of running on the processor 302.

[0093] When the processor 302 executes the program, it implements the water temperature regulation method for the fuel cell system provided in the above embodiments.

[0094] Furthermore, the vehicle also includes:

[0095] Communication interface 303 is used for communication between memory 301 and processor 302.

[0096] The memory 301 is used to store computer programs that can run on the processor 302.

[0097] The memory 301 may include high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk storage.

[0098] If the memory 301, processor 302, and communication interface 303 are implemented independently, then the communication interface 303, memory 301, and processor 302 can be interconnected via a bus to complete communication between them. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 3 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0099] Optionally, in a specific implementation, if the memory 301, processor 302, and communication interface 303 are integrated on a single chip, then the memory 301, processor 302, and communication interface 303 can communicate with each other through an internal interface.

[0100] Processor 302 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of this application.

[0101] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0102] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0103] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A water temperature adjustment method for a fuel cell system, characterized by, The method comprises the following steps: obtaining a mean value of a rising rate of high-frequency impedance of the fuel cell system in a plurality of historical purging stages; determining a target control parameter for maintaining a dry-wet state of the fuel cell system in a target state based on the mean value of the rising rate of high-frequency impedance and a reference mean value; adjusting a water temperature of a running stage of the fuel cell system based on the target control parameter.

2. The water temperature adjusting method of a fuel cell system according to claim 1, characterized by, The determining of the target control parameter for maintaining the dry-wet state of the fuel cell system in the target state based on the mean value of the rising rate of high-frequency impedance and the reference mean value comprises: calculating a difference between the mean value of the rising rate and the reference mean value; determining a target correction value of a target water temperature under each current according to the difference.

3. The water temperature adjusting method of a fuel cell system according to claim 2, characterized by, The determining of the target correction value of the target water temperature under each current according to the difference comprises: obtaining a corresponding relationship table of the difference and the target correction value; determining the target correction value of the target water temperature under each current based on the corresponding relationship table and the difference.

4. The water temperature adjusting method of a fuel cell system according to claim 2, characterized by The adjusting of the water temperature of the running stage of the fuel cell system based on the target control parameter comprises: correcting the target water temperature under each current according to the target correction value; adjusting the water temperature of the running stage of the fuel cell system based on the corrected target water temperature under each current.

5. The water temperature adjusting method of a fuel cell system according to claim 4, characterized by Before the adjusting of the water temperature of the running stage of the fuel cell system based on the corrected target water temperature under each current, the method further comprises: obtaining a water temperature range of the fuel cell system; correcting the target water temperature according to the water temperature range.

6. The water temperature adjusting method of a fuel cell system according to claim 1, characterized by Before the obtaining of the mean value of the rising rate of high-frequency impedance of the fuel cell system in the plurality of historical purging stages, the method further comprises: identifying a current purging number of the fuel cell system; if the current purging number is greater than a first preset number, obtaining the mean value of the rising rate of high-frequency impedance of the fuel cell system in the plurality of historical purging stages.

7. The water temperature adjusting method of a fuel cell system according to claim 1, characterized by, Before the determining of the target control parameter for maintaining the dry-wet state of the fuel cell system in the target state based on the mean value of the rising rate of high-frequency impedance and the reference mean value, the method further comprises: obtaining a second preset number of rising rates of the fuel cell system from a target period; determining the reference mean value according to the mean value of the second preset number of rising rates.

8. The water temperature adjusting method of a fuel cell system according to any one of claims 1 to 7, characterized by, The rising rate is calculated according to a change value of high-frequency impedance of a purging stage and a purging duration.

9. A water temperature regulating device for a fuel cell system, characterized in that, The method comprises: an obtaining module, configured to obtain a mean value of a rising rate of high-frequency impedance of the fuel cell system in a plurality of historical purging stages; a processing module, configured to determine a target control parameter for maintaining a dry-wet state of the fuel cell system in a target state based on the mean value of the rising rate of high-frequency impedance and a reference mean value; an adjusting module, configured to adjust a water temperature of a running stage of the fuel cell system based on the target control parameter.

10. A vehicle characterized by comprising: The method comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the water temperature adjustment method of the fuel cell system according to any one of claims 1-8.

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