Fuel cell vehicle stack water management method

Abstract

The application provides a fuel cell vehicle stack water management method, comprising: judging current hydrogen humidity entering the stack; when the current hydrogen humidity entering the stack is out of the required hydrogen humidity entering the stack in the current working condition, adjusting the pressure of the ejection backflow to the required hydrogen pressure entering the injector in the current working condition; when the air humidity entering the stack is out of the required air humidity entering the stack in the current working condition, calculating the corresponding power consumption required for adjusting the air humidity entering the stack to the required air humidity entering the stack in the current working condition, obtaining multiple power consumptions, comparing the multiple power consumptions, and adjusting the parameter with the small power consumption to the required air humidity entering the stack in the current working condition. The purpose of achieving the suitable water content in the stack and the highest output performance of the stack is achieved.

Description

Technical Field

[0001] This invention belongs to the field of fuel cell technology, and in particular relates to a method for managing water in a fuel cell vehicle stack. Background Technology

[0002] The lifespan and cost of fuel cell stacks limit the development of fuel cell vehicles. To improve stack durability, it needs to operate in optimal condition. The water content inside the stack is difficult to measure and is affected by many factors. Excessive water content obstructs gas flow, while insufficient water content affects individual cell performance and increases impedance. Both excessive and insufficient water content lead to performance degradation. To ensure optimal stack operation, the internal water content needs to be regulated. Current technology has not yet determined the order in which factors affecting stack water content should be adjusted, making it difficult to guarantee optimal output performance while regulating humidity. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention provides a method for water management of fuel cell vehicle stacks, which at least partially solves the problem that poor stack output performance is caused by inappropriate water content inside the stack.

[0004] In a first aspect, embodiments of this disclosure provide a method for managing water in a fuel cell vehicle stack, including:

[0005] If the current hydrogen humidity is outside the range required for the current operating conditions, adjust the ejector return pressure to the ejector inlet hydrogen pressure required for the current operating conditions.

[0006] When the humidity of the in-flight air is outside the range required for the current operating conditions, calculate the corresponding power consumption required to adjust the humidity of the in-flight air to the range required for the current operating conditions, obtain multiple power consumption values, compare the values ​​of the multiple power consumption values, and adjust the parameter with the smaller power consumption value to the range required for the current operating conditions.

[0007] Optionally, the step of determining the current hydrogen humidity entering the reactor and adjusting the ejector return pressure to the ejector inlet hydrogen pressure required for the current operating condition when the current hydrogen humidity is outside the range required for the current operating condition includes:

[0008] Based on the stack water balance humidity characteristic curve, the upper and lower limits of the required hydrogen humidity for the stack are obtained, thus determining the range of required hydrogen humidity for the current operating conditions.

[0009] Optionally, the step of determining the current hydrogen humidity entering the reactor and adjusting the ejector return pressure to the ejector inlet hydrogen pressure required for the current operating condition when the current hydrogen humidity is outside the range required for the current operating condition includes:

[0010] When the current hydrogen humidity entering the reactor is greater than the upper limit of the hydrogen humidity required for the current operating condition of the reactor, the humidity of the hydrogen entering the reactor is reduced by adjusting the ejector inlet pressure down to the minimum ejector inlet hydrogen pressure required for that operating condition. When the current hydrogen humidity entering the reactor is less than the lower limit of the hydrogen humidity required for the current operating condition of the reactor, the humidity of the hydrogen entering the reactor is increased by adjusting the ejector inlet pressure up to the maximum ejector inlet hydrogen pressure required for that operating condition.

[0011] Optionally, when the infeed air humidity is outside the range required for the current operating conditions, the corresponding power consumption required to adjust the infeed air humidity to the range required for the current operating conditions is calculated, resulting in multiple power consumptions, including: calculating the power consumed by the water pump to adjust the water temperature and the power consumption of the air compressor to adjust the air flow or pressure.

[0012] Optionally, the power consumed by the water pump for adjusting the water temperature is: P cool =C p *ρ*V cool *(T out ―T in );

[0013] Among them, C p V is the specific heat capacity of the coolant, ρ is the density of the coolant, and V is the specific heat capacity of the cool cool T is the volumetric flow rate of the coolant. out T in These are the coolant temperatures at the fuel cell stack outlet and inlet.

[0014] Optionally, the power consumption of the air compressor resulting from adjusting airflow or pressure is:

[0015] Among them, C pair T is the specific heat capacity of air. cp This refers to the inlet air temperature of the air compressor. For the efficiency of the drive motor, P cpout P is the outlet pressure of the air compressor. cpin Where γ is the inlet pressure of the air compressor, m is the specific heat coefficient of air, and γ is the specific heat coefficient of air. cp Air mass flow rate.

[0016] Optionally, compare multiple power consumption values ​​and adjust the parameter with the lower power consumption to the required in-pile air humidity range for the current operating condition, including:

[0017] Adjusting parameters to minimize power consumption maximizes the fuel cell stack output power, P. stack =I*V―P cool —P cp Where I is the fuel cell current and V is the fuel cell voltage.

[0018] Optionally, compare multiple power consumption values ​​and adjust the parameter with the lower power consumption to the required in-pile air humidity range for the current operating condition, including:

[0019] When the power consumption of the water pump is minimized, the water temperature is adjusted. When the current air humidity entering the reactor is less than the lower limit of the air humidity required for the current operating condition of the reactor, the water temperature is reduced to the minimum water temperature required for the current operating condition. When the current air humidity entering the reactor is greater than the upper limit of the air humidity required for the current operating condition of the reactor, the water temperature is increased to the maximum water temperature required for the current operating condition.

[0020] Optionally, compare multiple power consumption values ​​and adjust the parameter with the lower power consumption to the required in-pile air humidity range for the current operating condition, including:

[0021] When the power consumption of the air compressor is minimized by adjusting the air flow rate, the flow rate is adjusted. When the current air humidity entering the stack is less than the air humidity required for the current operating condition of the fuel cell stack, the flow rate is reduced to the minimum flow rate required for that operating condition. When the current air humidity entering the stack is greater than the upper limit of the air humidity required for the current operating condition of the fuel cell stack, the flow rate is increased to the maximum flow rate required for that operating condition.

[0022] Optionally, compare multiple power consumption values ​​and adjust the parameter with the lower power consumption to the required in-pile air humidity range for the current operating condition, including:

[0023] When the power consumption of the air compressor is minimized due to the adjustment of air pressure, if the current air humidity entering the stack is less than the lower limit of the air humidity required for the current operating condition of the fuel cell stack, the pressure is increased to the highest pressure required for that operating condition. If the current air humidity entering the stack is greater than the upper limit of the air humidity required for the current operating condition of the fuel cell stack, the pressure is decreased to the lowest pressure required for that operating condition.

[0024] The fuel cell vehicle stack water management method provided by this invention regulates the humidity of the hydrogen entering the stack by adjusting the ejector return pressure. When adjusting the humidity of the air entering the stack, parameters with lower power consumption are prioritized to the parameters required for the current operating conditions. When the water content inside the stack is too high or too low, the order of adjustment of influencing factors is determined. This achieves the goal of maximizing the stack's output performance while maintaining a suitable water content inside the stack. Attached Figure Description

[0025] The above and other objects, features and advantages of this disclosure will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0026] Figure 1 Structural schematic diagram of the air path, water path and hydrogen path of the fuel cell stack provided in the embodiments of this disclosure;

[0027] Figure 2 An electrical block diagram of fuel cell stack control is provided for embodiments of this disclosure;

[0028] Figure 3 A flowchart is provided for an embodiment of the present disclosure of a method for managing water in a fuel cell vehicle stack. Detailed Implementation

[0029] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0030] It should be understood that the following specific examples illustrate the implementation of this disclosure, and those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0031] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0032] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this disclosure. The illustrations only show the components related to this disclosure and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0034] The water content inside the fuel cell stack is affected by factors such as cathode inlet humidity, anode inlet humidity, cathode gas flow rate, inlet water temperature, and inlet air pressure. This patent adjusts the water content of the stack and maximizes the stack's output performance by controlling the above parameters.

[0035] like Figure 1 As shown, the fuel cell air and water circuits include a filter, air compressor, intercooler, humidifier, throttle valve, fuel cell stack, water pump, radiator, thermostat, ejector, first proportional valve, and second proportional valve 2. Figure 1 In the diagram, T1 and T2 correspond to the feed water temperature sensor and the discharge water temperature sensor, respectively; RH1 and RH2 are the feed air humidity sensor and the feed hydrogen humidity sensor, respectively; and P1 and P2 are the air feed pressure sensor and the hydrogen feed pressure sensor, respectively. The fuel cell stack has different required ranges for feed air humidity, air flow rate, air pressure, hydrogen pressure, hydrogen humidity, and water temperature under different operating conditions.

[0036] like Figure 2 As shown, the electrical components of the fuel cell stack include a control system, which acquires the output current and voltage of the DC-DC converter and calculates the net output power. Sensors include a flow sensor, pressure sensor, temperature sensor, humidity sensor, and hydrogen pressure sensor. The control system acquires sensor signals. Actuators include an air compressor, water pump, thermostat, throttle valve, and proportional valve. The control system sends commands to the actuators.

[0037] The fuel cell vehicle stack water management method disclosed in this embodiment includes: judging the current humidity of the hydrogen entering the stack; when the current humidity of the hydrogen entering the stack is outside the range of the hydrogen humidity required for the current operating condition, adjusting the ejector backflow pressure to the ejector inlet hydrogen pressure required for the current operating condition.

[0038] When the humidity of the in-flight air is outside the range required for the current operating conditions, calculate the corresponding power consumption required to adjust the humidity of the in-flight air to the range required for the current operating conditions, obtain multiple power consumption values, compare the values ​​of the multiple power consumption values, and adjust the parameter with the smaller power consumption value to the range required for the current operating conditions.

[0039] Optionally, the step of determining the current hydrogen humidity entering the reactor and adjusting the ejector return pressure to the ejector inlet hydrogen pressure required for the current operating condition when the current hydrogen humidity is outside the range required for the current operating condition includes:

[0040] Based on the stack water balance humidity characteristic curve, the upper and lower limits of the required hydrogen humidity for the stack are obtained, thus determining the range of required hydrogen humidity for the current operating conditions.

[0041] Optionally, the step of determining the current hydrogen humidity entering the reactor and adjusting the ejector return pressure to the ejector inlet hydrogen pressure required for the current operating condition when the current hydrogen humidity is outside the range required for the current operating condition includes:

[0042] When the current hydrogen humidity entering the reactor is greater than the upper limit of the hydrogen humidity required for the current operating condition of the reactor, the humidity of the hydrogen entering the reactor is reduced by adjusting the ejector inlet pressure to the minimum ejector inlet hydrogen pressure required for the current operating condition. When the current hydrogen humidity entering the reactor is less than the lower limit of the hydrogen humidity required for the current operating condition of the reactor, the humidity of the hydrogen entering the reactor is increased by adjusting the ejector inlet pressure to the maximum ejector inlet hydrogen pressure required for the current operating condition.

[0043] Optionally, when the humidity of the incoming air is outside the range required for the current operating conditions, the corresponding power consumption required to adjust the humidity of the incoming air to the range required for the current operating conditions is calculated, resulting in multiple power consumptions, including: calculating the power consumed by the water pump to adjust the water temperature and the power consumption of the air compressor to adjust the air flow or pressure.

[0044] Optionally, compare multiple power consumption values ​​and adjust the parameter with the lower power consumption to the required in-pile air humidity range for the current operating condition, including:

[0045] When the power consumption of the water pump is minimized, the water temperature is adjusted. When the current air humidity entering the reactor is less than the lower limit of the air humidity required for the current operating condition of the reactor, the water temperature is reduced to the minimum water temperature required for the current operating condition. When the current air humidity entering the reactor is greater than the upper limit of the air humidity required for the current operating condition of the reactor, the water temperature is increased to the maximum water temperature required for the current operating condition.

[0046] Optionally, compare multiple power consumption values ​​and adjust the parameter with the lower power consumption to the required in-pile air humidity range for the current operating condition, including:

[0047] When the power consumption of the air compressor is minimized by adjusting the air flow rate, the flow rate is adjusted. When the current air humidity entering the stack is less than the air humidity required for the current operating condition of the fuel cell stack, the flow rate is reduced to the minimum flow rate required for that operating condition. When the current air humidity entering the stack is greater than the upper limit of the air humidity required for the current operating condition of the fuel cell stack, the flow rate is increased to the maximum flow rate required for that operating condition.

[0048] Optionally, compare multiple power consumption values ​​and adjust the parameter with the lower power consumption to the required in-pile air humidity range for the current operating condition, including:

[0049] When the power consumption of the air compressor is minimized due to the adjustment of air pressure, if the current air humidity entering the stack is less than the lower limit of the air humidity required for the current operating condition of the fuel cell stack, the pressure is increased to the highest pressure required for that operating condition. If the current air humidity entering the stack is greater than the upper limit of the air humidity required for the current operating condition of the fuel cell stack, the pressure is decreased to the lowest pressure required for that operating condition.

[0050] In a specific application scenario, such as Figure 3 As shown, the method includes the following steps:

[0051] S01: Start;

[0052] S02: Obtain the infeed humidity based on the infeed humidity sensor. Specifically, under different operating conditions of the fuel cell, the control system obtains the hydrogen infeed humidity based on the humidity sensor;

[0053] S03: Determine the upper and lower limits of the required hydrogen humidity for the fuel cell stack under the corresponding operating conditions [RH_an1, RH_an2]. Specifically, obtain the upper and lower limits of the required hydrogen humidity for the fuel cell stack from the fuel cell stack water balance humidity characteristic curve, and make a judgment on the humidity data obtained in S02;

[0054] S04: If the judgment result is yes, adjust the system operating parameters; if the judgment result is no, no action is taken. Specifically, if the current humidity is outside the range required for the current operating conditions of the fuel cell stack [RH_an1, RH_an2], water management inside the fuel cell stack is required, and the system operating parameters need to be adjusted; if the judgment result is no, it means that the current humidity is within the range required for the fuel cell stack [RH_an1, RH_an2], indicating that the fuel cell stack will not experience flooding or membrane drying, and no action is taken.

[0055] S05: Adjust the ejector inlet pressure to the maximum or minimum ejector inlet hydrogen pressure required for this operating condition. Specifically, if the current humidity is greater than the upper limit RH_an2 required for the current operating condition of the fuel cell stack, the ejector inlet pressure can be adjusted to the minimum ejector inlet hydrogen pressure required for this operating condition. To reduce the humidity of the hydrogen entering the reactor, if the current humidity is lower than the lower limit RH_an1 required for the current operating conditions of the reactor, the ejector inlet pressure can be adjusted up to the maximum ejector inlet hydrogen pressure required for that operating condition. Increase the humidity of the hydrogen gas fed into the reactor. Within the required ejector inlet pressure range under this operating condition. Adjusting the pressure only changes the humidity of the hydrogen entering the stack; it does not consume the stack's output power.

[0056] S06: Determine the upper and lower limits of the required feed air humidity for the fuel cell stack under the corresponding operating conditions [RH_ca1, RH_ca2]. Specifically, obtain the upper and lower limits of the required feed gas humidity from the fuel cell stack water balance humidity characteristic curve, and then evaluate the humidity data obtained in S02.

[0057] S07: When the result is yes, calculate the following impacts of adjusting the influent air humidity to the range [RH_ca1, RH_ca2]: ① Power consumed by the water pump for adjusting the water temperature; ② Power consumption of the air compressor due to adjusting the flow rate; ③ Power consumption of the air compressor due to adjusting the pressure. Specifically, the power consumed by the water pump for adjusting the water temperature is: P cool =C p *ρ*V cool *(T out ―T in ), C p V is the specific heat capacity of the coolant, ρ is the density of the coolant, and V is the specific heat capacity of the cool cool T is the volumetric flow rate of the coolant. out T in The coolant temperatures at the fuel cell stack outlet and inlet; the power consumption of the air compressor resulting from adjusting the flow rate or pressure is: C pair T is the specific heat capacity of air. cp This refers to the inlet air temperature of the air compressor. For the efficiency of the drive motor, P cpout P is the outlet pressure of the air compressor. cpin Where γ is the inlet pressure of the air compressor, m is the specific heat coefficient of air, and γ is the specific heat coefficient of air. cp This refers to the air mass flow rate. If the result is negative, the adjustment ends.

[0058] S08: Compare the power consumption of parameters ①, ②, and ③, and prioritize adjusting the parameter with the lowest power consumption. Specifically, based on the calculation results of S07 and comparing their magnitudes, prioritize adjusting the parameter that results in the lowest power consumption, so that the stack output power: P stack =I*V―P cool —P cp At its highest, I is the fuel cell stack current, and V is the fuel cell stack voltage.

[0059] S09: Based on the comparison results of S08, if ① results in the least power consumption, the water temperature is adjusted first. If the current air humidity entering the reactor is less than the lower limit RH_ca1 required for the current operating condition of the fuel cell, the water temperature is reduced to the minimum required water temperature for this condition. If the current air humidity entering the reactor is greater than the upper limit RH_ca2 required for the current operating condition of the fuel cell, the water temperature is increased to the maximum required water temperature for this condition. If ② results in the least power consumption, the flow rate is adjusted. If the current air humidity entering the reactor is less than the lower limit RH_ca1 required for the current operating condition of the fuel cell, the flow rate is reduced to the minimum required flow rate for this condition. If the current air humidity entering the reactor is greater than the upper limit RH_ca2 required for the current operating condition of the fuel cell, the flow rate is increased to the maximum required flow rate for this condition. If ③ results in the least power consumption, if the current air humidity entering the reactor is less than the lower limit RH_ca1 required for the current operating condition of the fuel cell, the pressure is increased to the maximum required pressure for this condition. If the current air humidity entering the reactor is greater than the upper limit RH_ca2 required for the current operating condition of the fuel cell, the pressure is reduced to the minimum required pressure for this condition.

[0060] S010: Determine whether the humidity of the feed air after parameter adjustment is within [RH_ca1, RH_ca2]. Specifically, obtain the upper and lower limits of the required feed gas humidity from the fuel cell stack water balance humidity characteristic curve, and evaluate the humidity data obtained in S02.

[0061] S011: If the judgment result is yes, the adjustment ends; if the judgment result is no, it indicates that the humidity still does not meet the requirements after performing the S09 operation, and the remaining parameters need to be further adjusted.

[0062] S012: Prioritize adjusting parameters with lower power consumption. Specifically, compare the power consumption resulting from adjusting the remaining two parameters to bring the in-flush air humidity to the range of [RH_ca1, RH_ca2], and prioritize adjusting the parameter with lower power consumption.

[0063] This disclosed fuel cell stack water management method addresses the issue of parameter adjustment when the humidity of the incoming air is outside the required range for current operating conditions. Based on theoretical calculations or humidity characteristic curves, the method assesses the current incoming hydrogen humidity. When the humidity is outside the required range, it first adjusts the ejector return pressure to the maximum or minimum required ejector inlet hydrogen pressure for the current operating conditions. Then, it determines whether the incoming air humidity is outside the required range, calculates the corresponding power consumption resulting from adjusting the incoming air humidity to the [RH_ca1, RH_ca2] range, compares the power consumption, and prioritizes adjusting the parameter with the lower power consumption to the maximum or minimum required value for the current operating conditions. This method maximizes the output performance of the fuel cell stack while ensuring the internal water content remains within a suitable range.

[0064] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0065] In this disclosure, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Words such as "including," "comprising," "having," etc., are open-ended terms meaning "including but not limited to," and are used interchangeably with them. The terms "or" and "and" as used herein refer to the terms "and / or," and are used interchangeably with them unless the context explicitly indicates otherwise. The term "such as" as used herein refers to the phrase "such as but not limited to," and is used interchangeably with it.

[0066] Additionally, as used herein, the “or” used in a list of items beginning with “at least one” indicates a separate list, such that a list of, for example, “at least one of A, B, or C” means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word “exemplary” does not imply that the described example is preferred or better than other examples.

[0067] It should also be noted that in the systems and methods of this disclosure, the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions to this disclosure.

[0068] Various changes, substitutions, and modifications can be made to the technology described herein without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of this disclosure is not limited to the specific aspects of the processes, machines, manufactures, events, means, methods, and actions described above. Currently existing or later-developed processes, machines, manufactures, events, means, methods, or actions that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Therefore, the appended claims include such processes, machines, manufactures, events, means, methods, or actions within their scope.

[0069] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0070] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A method for managing water in a fuel cell vehicle stack, characterized in that, include: The current hydrogen humidity entering the reactor is assessed. If the current hydrogen humidity is outside the range required for the current operating conditions, the ejector return pressure is adjusted to the required ejector inlet hydrogen pressure for the current operating conditions, including: When the current hydrogen humidity of the fuel cell is greater than the upper limit of the hydrogen humidity required for the current operating condition of the fuel cell, the humidity of the hydrogen is reduced by adjusting the ejector inlet pressure down to the minimum ejector inlet hydrogen pressure required for the current operating condition. When the current hydrogen humidity of the fuel cell is less than the lower limit of the hydrogen humidity required for the current operating condition of the fuel cell, the humidity of the hydrogen is increased by adjusting the ejector inlet pressure down to the maximum ejector inlet hydrogen pressure required for the current operating condition. When the humidity of the incoming air is outside the range required for the current operating conditions, calculate the corresponding power consumption required to adjust the humidity of the incoming air to the range required for the current operating conditions, and obtain multiple power consumptions. The corresponding power consumptions include: the power consumption of the water pump for adjusting the water temperature, the power consumption of the air compressor for adjusting the flow rate, and the power consumption of the air compressor for adjusting the pressure. Compare multiple power consumption values ​​and adjust the parameter with the lower power consumption to the required in-flush air humidity range for the current operating condition based on the comparison results; The step of adjusting the parameter with lower power consumption to the required in-pile air humidity range based on the comparison result includes: When the power consumption of the water pump is minimized, the water temperature is adjusted. If the current humidity of the air entering the reactor is less than the lower limit of the humidity required for the current operating condition, the water temperature is lowered to the minimum water temperature required for the current operating condition. If the current humidity of the air entering the reactor is greater than the upper limit of the humidity required for the current operating condition, the water temperature is raised to the maximum water temperature required for the current operating condition. When the power consumption of the air compressor is minimized by adjusting the air flow rate, the air flow rate is adjusted. If the current humidity of the air entering the pile is less than the lower limit of the humidity required for the current operating condition, the air flow rate is reduced to the minimum flow rate required for the current operating condition. If the current humidity of the air entering the pile is greater than the upper limit of the humidity required for the current operating condition, the air flow rate is increased to the maximum flow rate required for the current operating condition. When the power consumption of the air compressor is minimized due to the adjustment of air pressure, the air pressure is adjusted. If the current humidity of the incoming air is less than the lower limit of the humidity required for the current operating condition, the air pressure is increased to the highest pressure required for the current operating condition. If the current humidity of the incoming air is greater than the upper limit of the humidity required for the current operating condition, the air pressure is decreased to the lowest pressure required for the current operating condition.

2. The fuel cell vehicle stack water management method according to claim 1, characterized in that, The step of determining the current hydrogen humidity entering the reactor and adjusting the ejector return pressure to the required ejector inlet hydrogen pressure under the current operating conditions when the current hydrogen humidity is outside the range required for the current operating conditions includes: Based on the stack water balance humidity characteristic curve, the upper and lower limits of the required hydrogen humidity for the stack are obtained, thus determining the range of required hydrogen humidity for the current operating conditions.

3. The fuel cell vehicle stack water management method according to claim 1, characterized in that, The power consumed by the water pump for adjusting the water temperature is: ; in, The specific heat capacity of the coolant. For coolant density, This refers to the volumetric flow rate of the coolant. , These are the coolant temperatures at the fuel cell stack outlet and inlet.

4. The fuel cell vehicle stack water management method according to claim 3, characterized in that, The power consumption of the air compressor due to adjusting airflow or pressure is: ; in, The specific heat capacity of air, This refers to the inlet air temperature of the air compressor. To improve the efficiency of the drive motor, This refers to the outlet pressure of the air compressor. This refers to the inlet pressure of the air compressor. The specific heat coefficient of air. Air mass flow rate.

5. The fuel cell vehicle stack water management method according to claim 4, characterized in that, Compare multiple power consumption values ​​and adjust the parameter with the lower power consumption to the required in-pile air humidity range for the current operating conditions, including: Adjusting parameters to minimize power consumption maximizes the fuel cell stack's output power. ,in, For the fuel cell stack current, This is the stack voltage.

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