Drainage control method, device and vehicle for hydrogen fuel cell system

Abstract

The present invention discloses a drainage control method, device, and vehicle for a hydrogen fuel cell system. The method comprises: determining the water content and target drainage rate of the hydrogen fuel cell system; and controlling the operating state of a drainage valve based on the target drainage rate to maintain the water content within a preset water content range. The present invention can accurately control the operating state of the drainage valve based on the water content and target drainage rate of the hydrogen fuel cell system to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and flooding of the fuel cell stack, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, the method can prevent corrosion and damage to the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, thereby helping to extend the service life of the hydrogen fuel cell and reduce maintenance and replacement costs.

Description

Technical Field

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

[0002] In recent years, the global energy crisis and environmental pollution have become increasingly severe. In the automotive industry, fuel cell engines are considered the ultimate solution due to their environmental friendliness and high energy efficiency. However, during operation, they produce a large amount of liquid water. Excessive water content in the fuel cell stack can reduce its performance and shorten its lifespan.

[0003] In the existing technology, the control scheme commonly adopted by the fuel cell industry is to set a fixed periodic opening frequency of the drain valve based on the stack and voltage. However, there is fluctuation between the stack voltage and the water production, and it is difficult to accurately establish the relationship between the two. At the same time, the instability of the system pressure also increases the difficulty of control, which can easily affect the drainage of the fuel cell, causing flooding, affecting the normal operation of the fuel cell, and causing damage to the fuel cell. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, one object of the present invention is to propose a drainage control method for a hydrogen fuel cell system, which can accurately control the operating state of the drain valve according to the water content and target drainage speed of the hydrogen fuel cell system to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and causing flooding of the fuel cell stack, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent corrosion and damage to the hydrogen fuel cells caused by excessive water accumulation in the hydrogen fuel cell system, help to extend the service life of the hydrogen fuel cells, and reduce maintenance and replacement costs.

[0006] To this end, a second object of the present invention is to provide a drainage control device for a hydrogen fuel cell system.

[0007] To this end, a third object of the present invention is to provide a vehicle.

[0008] To this end, a fourth object of the present invention is to provide a computer-readable storage medium.

[0009] To this end, a fifth object of the present invention is to provide a computer program product.

[0010] In order to achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention proposes a drainage control method for a hydrogen fuel cell system, including: determining the water content and target drainage speed of the hydrogen fuel cell system; controlling the operating state of the drain valve based on the target drainage speed to maintain the water content within a preset water content range.

[0011] According to the drainage control method of the hydrogen fuel cell system in an embodiment of the present invention, the operating state of the drain valve can be accurately controlled according to the water content of the hydrogen fuel cell system and the target drainage speed to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and causing the fuel cell stack to be flooded, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the hydrogen fuel cell system from being corroded and damaged due to excessive water accumulation, which helps to extend the service life of the hydrogen fuel cell and reduce maintenance and replacement costs.

[0012] In addition, the drainage control method of the hydrogen fuel cell system according to the embodiment of the present invention may also have the following additional technical features:

[0013] In some examples, determining the water content of the hydrogen fuel cell system includes: obtaining a high-frequency impedance of a fuel cell stack and a humidity value of the hydrogen fuel cell system; and determining the water content based on the humidity value and the high-frequency impedance of the fuel cell stack.

[0014] In some examples, obtaining the humidity value of the hydrogen fuel cell system includes: obtaining the air flow value, air temperature value, and ambient temperature value of the environment in which the hydrogen fuel cell system is located; and querying a first preset table based on the air flow value, air temperature value, and ambient temperature value to determine the humidity of the fuel cell stack, wherein the first preset table contains multiple correspondences about air flow value-air temperature value-ambient temperature value-humidity value.

[0015] In some examples, determining the water content based on the humidity value and the high-frequency impedance of the fuel cell stack includes:

[0016] ;

[0017] in, is the water content, is a constant coefficient, is the high-frequency impedance of the stack, is the air flow value, is the air temperature value, is the ambient temperature value.

[0018] In some examples, determining a target drainage rate of the hydrogen fuel cell system includes: obtaining a calibrated drainage rate, a change in the variance of the average voltage of the fuel cell stack, a change in the water content, a change in the difference between the hydrogen pressure and the ambient pressure of the hydrogen fuel cell system, a change in the air flow value, and a change in the ambient temperature value; and determining the target drainage rate based on the calibrated drainage rate, the change in the variance of the average voltage of the fuel cell stack, the change in the water content, the change in the difference between the hydrogen pressure and the ambient pressure, the change in the air flow value, and the change in the ambient temperature value.

[0019] In some examples, obtaining the calibrated drainage speed includes: obtaining a power instruction issued by an on-board controller to the hydrogen fuel cell system; determining a current target value of the fuel cell stack based on the power instruction; and determining the calibrated drainage speed by querying a second preset table based on the current target value, wherein the second preset table contains multiple correspondences between current target values ​​and calibrated drainage speeds.

[0020] In some examples, determining the target drainage rate based on the calibrated drainage rate, a variance change in the average voltage of the fuel cell stack, a change in the water content, a change in the difference between the hydrogen pressure and the ambient pressure, a change in the air flow value, and a change in the ambient temperature value includes:

[0021] ;

[0022] in, is the target drainage rate, is the calibrated drainage velocity, is the variance change of the average voltage of the battery stack, is the change in water content, is the change in the difference between the hydrogen pressure and the ambient pressure, is the change in the air flow value, is the change in the ambient temperature value, 、 is a constant coefficient.

[0023] In some examples, the operating state of the drain valve is controlled based on the target drainage speed so that the water content is maintained within a preset water content range, including: querying a third preset table based on the target drainage speed to determine the target opening value of the drain valve, and controlling the opening of the drain valve based on the target opening value so that the water content is maintained within the preset water content range, wherein the third preset table contains multiple correspondences between target drainage speed and target opening value.

[0024] In order to achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes a drainage control device for a hydrogen fuel cell system, including: a determination module for determining the water content and target drainage speed of the hydrogen fuel cell system; a control module for controlling the operating state of the drain valve based on the target drainage speed so that the water content is maintained within a preset water content range.

[0025] According to the drainage control device of the hydrogen fuel cell system of the present invention, the operating state of the drain valve can be accurately controlled according to the water content of the hydrogen fuel cell system and the target drainage speed to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and causing the fuel cell stack to be flooded, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the hydrogen fuel cell system from being corroded and damaged due to excessive water accumulation, which helps to extend the service life of the hydrogen fuel cell and reduce maintenance and replacement costs.

[0026] In order to achieve the above-mentioned object, an embodiment of a third aspect of the present invention provides a vehicle, comprising: the drainage control device of the hydrogen fuel cell system described in the above-mentioned embodiment.

[0027] According to the vehicle of the embodiment of the present invention, the operating state of the drain valve can be accurately controlled according to the water content of the hydrogen fuel cell system and the target drainage speed to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and flooding of the fuel cell stack, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the hydrogen fuel cell system from being corroded and damaged due to excessive water accumulation, which helps to extend the service life of the hydrogen fuel cell and reduce maintenance and replacement costs.

[0028] A further embodiment of the present invention also discloses a computer-readable storage medium, which stores a drainage control program for a hydrogen fuel cell system. When the drainage control program for the hydrogen fuel cell system is executed by a processor, the drainage control method for the hydrogen fuel cell system as described in any of the above embodiments of the present invention is implemented.

[0029] According to the computer-readable storage medium of an embodiment of the present invention, when the drainage control program of the hydrogen fuel cell system stored thereon is executed by the processor, the operating state of the drain valve can be accurately controlled according to the water content of the hydrogen fuel cell system and the target drainage speed, so that the water content is maintained within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and causing the fuel cell stack to be flooded, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the hydrogen fuel cell system from being corroded and damaged due to excessive water accumulation, which helps to extend the service life of the hydrogen fuel cell and reduce maintenance and replacement costs.

[0030] A further embodiment of the present invention further discloses a computer program, which, when executed, implements the drainage control method of the hydrogen fuel cell system as described in any of the above embodiments of the present invention.

[0031] According to the computer program of the embodiment of the present invention, when the computer program is executed, the operating state of the drain valve can be accurately controlled according to the water content of the hydrogen fuel cell system and the target drainage speed, so that the water content is maintained within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and causing the fuel cell stack to be flooded, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the hydrogen fuel cell system from being corroded and damaged due to excessive water accumulation, which helps to extend the service life of the hydrogen fuel cell and reduce maintenance and replacement costs.

[0032] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0034] Figure 1 is a flow chart of a drainage control method for a hydrogen fuel cell system according to one embodiment of the present invention;

[0035] Figure 2 1 is a schematic structural diagram of a drainage control device for a hydrogen fuel cell system according to an embodiment of the present invention.

[0036] Reference numerals:

[0037] A drainage control device 100 for a hydrogen fuel cell system; a determination module 110; and a control module 120. DETAILED DESCRIPTION

[0038] In order to provide a more detailed understanding of the features and technical content of the embodiments of the present invention, the implementation of the embodiments of the present invention is described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference only and are not intended to limit the embodiments of the present invention. In the following technical description, for the sake of convenience, multiple details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details.

[0039] Reference below Figure 1-Figure 2 A water drainage control method, device, and vehicle of a hydrogen fuel cell system according to embodiments of the present invention are described.

[0040] Figure 1FIG. 1 is a flow chart of a method for controlling drainage of a hydrogen fuel cell system according to an embodiment of the present invention. Figure 1 As shown, the method includes the following steps:

[0041] like Figure 1 As shown, the drainage control method of the hydrogen fuel cell system includes the following steps:

[0042] Step S1: Determine the water content and target water drainage rate of the hydrogen fuel cell system.

[0043] Specifically, when controlling the drainage of a hydrogen fuel cell system, the current water content (i.e., the liquid water content) of the hydrogen fuel cell system can be determined. Methods for determining this include, but are not limited to, using a humidity sensor or moisture sensor to measure the water content in the fuel cell stack or related components of the hydrogen fuel cell system, and combining this with operating parameters of the hydrogen fuel cell system, such as current, voltage, and temperature, to derive the water content of the hydrogen fuel cell system through an algorithmic model. Furthermore, the target drainage rate of the hydrogen fuel cell system can be determined based on the water content of the hydrogen fuel cell system, so that the operating state of the drain valve can be controlled based on the target drainage rate.

[0044] Step S2: controlling the operating state of the drain valve based on the target drainage speed to maintain the water content within a preset water content range.

[0045] Specifically, after determining the water content and target drainage speed of the hydrogen fuel cell system, the operating state of the drain valve can be controlled based on the target drainage speed, including but not limited to controlling the opening degree of the drain valve and controlling the opening time and opening frequency of the exhaust valve to maintain the water content within a preset water content range. For example, the current water content monitored in real time can be compared with the preset water content range. If the current water content is higher than the upper limit of the preset water content range, it means that the water content is relatively high and the fuel cell stack in the hydrogen fuel cell system is at risk of flooding. The drainage speed can be accelerated to reduce the water content, thereby preventing corrosion and damage to the hydrogen fuel cells caused by excessive water accumulation in the hydrogen fuel cell system, thereby extending the service life of the hydrogen fuel cells. If the current water content is lower than the lower limit of the preset water content range, the drainage speed can be reduced or the drainage can be stopped to avoid damage to the hydrogen fuel cells caused by excessive drying.

[0046] Therefore, the above-mentioned drainage control method of the hydrogen fuel cell system can accurately control the operating state of the drain valve according to the water content of the hydrogen fuel cell system and the target drainage speed, so as to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and causing flooding of the fuel cell stack, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the hydrogen fuel cell system from being corroded and damaged due to excessive water accumulation, which helps to extend the service life of the hydrogen fuel cell and reduce maintenance and replacement costs.

[0047] In one embodiment of the present invention, determining the water content of a hydrogen fuel cell system includes: obtaining the high-frequency impedance of the fuel cell stack and the humidity value of the hydrogen fuel cell system; and determining the water content based on the humidity value and the high-frequency impedance of the fuel cell stack.

[0048] Specifically, since high-frequency impedance is the impedance characteristic of the fuel cell stack under a high-frequency AC signal, in a hydrogen fuel cell, the high-frequency impedance of the fuel cell stack can reflect the moisture state inside the hydrogen fuel cell. For example, when the moisture content inside the hydrogen fuel cell is moderate, the high-frequency impedance can present a relatively stable value. If the hydrogen fuel cell has too much moisture, it can cause the membrane electrode to become more wetted, thereby affecting the value of the high-frequency impedance. Conversely, if the hydrogen fuel cell has too little moisture, the membrane electrode may become too dry, which will also change the high-frequency impedance reading. At the same time, the humidity value of the hydrogen fuel cell system accounts for an important proportion of the water content and affects the generation of liquid water in the hydrogen fuel cell system. Therefore, when determining the water content of the hydrogen fuel cell system, the high-frequency impedance of the fuel cell stack can be obtained through a CVW (Cell Voltage Monitor). At the same time, the humidity value of the hydrogen fuel cell system can be directly obtained through a humidity sensor, or indirectly obtained through parameters related to the humidity value of the hydrogen fuel cell system combined with a preset algorithm.

[0049] Furthermore, after obtaining the high-frequency impedance and humidity values, the water content of the hydrogen fuel cell system can be determined based on the high-frequency impedance and humidity values, including but not limited to establishing a formula or machine learning model, using the high-frequency impedance and humidity values ​​as input variables and the water content as an output variable to accurately derive the water content of the hydrogen fuel cell system under different conditions.

[0050] In one embodiment of the present invention, obtaining the humidity value of the hydrogen fuel cell system includes: obtaining the air flow value, air temperature value and ambient temperature value of the environment in which the hydrogen fuel cell system is located; querying a first preset table based on the air flow value, air temperature value and ambient temperature value to determine the humidity of the fuel cell stack, wherein the first preset table contains multiple correspondences about air flow value-air temperature value-ambient temperature value-humidity value.

[0051] Specifically, in the process of obtaining the humidity value of the hydrogen fuel cell system, the air flow value, air temperature value, and ambient temperature value of the environment in which the hydrogen fuel cell system is located can be obtained. Among them, the air flow value can be measured by the air flow meter in the hydrogen fuel cell system; the air temperature value can be measured by the air temperature sensor; and the ambient temperature value can be measured by the temperature sensor. It can be understood that changes in air flow can affect the water distribution and temperature distribution of the hydrogen fuel cell system, thereby affecting the humidity value; changes in air temperature can affect the saturation of water in the air, thereby affecting the humidity value; changes in ambient temperature can affect the water evaporation and condensation process of the hydrogen fuel cell system, thereby affecting the humidity value.

[0052] Furthermore, after obtaining the air flow, air temperature, and ambient temperature values, the first preset table can be traversed (i.e., checked row by row or record by record) until the humidity value corresponding to the air flow, air temperature, and ambient temperature values ​​is found. It will be appreciated that the first preset table stores multiple sets of correspondences between air flow, air temperature, ambient temperature, and humidity values, i.e., each row or record in the first preset table represents a specific combination of air flow, air temperature, ambient temperature, and humidity values. The first preset table can be derived through experimental measurements, simulation calculations, or empirical formulas.

[0053] In one embodiment of the present invention, determining the water content based on the humidity value and the high-frequency impedance of the stack includes:

[0054] ;

[0055] in, is the water content, is a constant coefficient, is the high-frequency impedance of the stack, is the air flow value, is the air temperature value, is the ambient temperature value.

[0056] Specifically, when determining the water content based on the humidity value and the high-frequency impedance of the stack, the formula is as described above, where: Indicates the water content, that is, the content of liquid water in the hydrogen fuel cell system, which can reflect the amount of water in the hydrogen fuel cell system. It represents the constant coefficient and can be calibrated according to experiments or theoretical analysis. It can reflect the linear relationship between high-frequency impedance and water content. Indicates the high-frequency impedance of the battery stack, which can reflect the impedance characteristics of the battery stack under high-frequency AC signals. Indicates the air flow value, that is, the air flow entering the hydrogen fuel cell system. Indicates the air temperature value, that is, the temperature of the air entering the hydrogen fuel cell system. Indicates the ambient temperature value, that is, the temperature of the environment in which the hydrogen fuel cell system is located.

[0057] In one embodiment of the present invention, determining a target drainage rate of a hydrogen fuel cell system includes: obtaining a calibrated drainage rate, a variance change in the average voltage of the fuel cell stack, a change in water content, a change in the difference between the hydrogen pressure and the ambient pressure of the hydrogen fuel cell system, a change in the air flow value, and a change in the ambient temperature value; determining the target drainage rate based on the calibrated drainage rate, the variance change in the average voltage of the fuel cell stack, the change in water content, the change in the difference between the hydrogen pressure and the ambient pressure, the change in the air flow value, and the change in the ambient temperature value.

[0058] Specifically, in the process of determining the target drainage speed of the hydrogen fuel cell system, the calibrated drainage speed, the variance change of the average voltage of the stack, the change in water content, the change in the difference between the hydrogen pressure of the hydrogen fuel cell system and the ambient pressure, the change in the air flow value, and the change in the ambient temperature value can be obtained. The calibrated drainage speed can be obtained according to actual conditions, including but not limited to querying a corresponding data table; the change in water content can be obtained based on the water content obtained by real-time detection and the pre-calibrated water content; and the variance change of the average voltage of the stack, the change in the difference between the hydrogen pressure of the hydrogen fuel cell system and the ambient pressure, the change in the air flow value, and the change in the ambient temperature value can be calculated based on the corresponding data obtained through corresponding sensors through an algorithm preset in the FCU (Fuel-cell Control Unit). For example, the real-time average voltage of the stack can be obtained through a voltage sensor and uploaded to the FCU. The FCU can calculate the variance of the average voltage of the stack according to the variance algorithm, and perform an algorithm operation on the variance of the pre-calibrated average voltage of the stack to obtain the variance change of the average voltage of the stack.

[0059] Furthermore, after obtaining the calibrated drainage speed, the variance change of the average voltage of the fuel cell stack, the change in water content, the change in the difference between the hydrogen pressure of the hydrogen fuel cell system and the ambient pressure, the change in the air flow value and the change in the ambient temperature value, the target drainage speed can be determined based on the calibrated drainage speed, the variance change of the average voltage of the fuel cell stack, the change in water content, the change in the difference between the hydrogen pressure of the hydrogen fuel cell system and the ambient pressure, the change in the air flow value and the change in the ambient temperature value, including but not limited to establishing a formula or machine learning model, using the calibrated drainage speed, the variance change of the average voltage of the fuel cell stack, the change in water content, the change in the difference between the hydrogen pressure of the hydrogen fuel cell system and the ambient pressure, the change in the air flow value and the change in the ambient temperature value as input variables and the target drainage speed as the output variable, so as to accurately obtain the target drainage speed of the hydrogen fuel cell system under different conditions.

[0060] In one embodiment of the present invention, obtaining the calibrated drainage speed includes: obtaining a power instruction issued by an on-board controller to the hydrogen fuel cell system; determining the current target value of the fuel cell stack based on the power instruction; and determining the calibrated drainage speed by querying a second preset table based on the current target value, wherein the second preset table contains multiple correspondences between the current target value and the calibrated drainage speed.

[0061] Specifically, when obtaining the calibrated drainage speed, the on-board controller can issue a power instruction to the hydrogen fuel cell system based on the vehicle's driving requirements, the status of the hydrogen fuel cell, etc., to meet the vehicle's driving or other power requirements; further, the hydrogen fuel cell system can parse the power instruction to obtain the current target value of the fuel cell stack; further, after obtaining the current target value of the fuel cell stack, the second preset table can be traversed (i.e., checked row by row or record by record) until the calibrated drainage speed corresponding to the current target value of the fuel cell stack is found. It can be understood that the second preset table stores multiple sets of correspondences between the current target value of the fuel cell stack and the calibrated drainage speed, that is, each row or each record in the second preset table represents a specific combination of the current target value of the fuel cell stack and the calibrated drainage speed, wherein the second preset table can be obtained through experimental measurement, simulation calculation or empirical formula.

[0062] In one embodiment of the present invention, determining a target drainage rate based on a calibrated drainage rate, a variance change of an average voltage of the stack, a change in water content, a change in the difference between hydrogen pressure and ambient pressure, a change in air flow rate, and a change in ambient temperature includes:

[0063] ;

[0064] in, is the target drainage rate, To calibrate the drainage speed, is the variance change of the average voltage of the battery stack, is the change in water content, is the change in the difference between hydrogen pressure and ambient pressure, is the change in air flow rate, is the change in ambient temperature, 、 is a constant coefficient.

[0065] Specifically, when determining the target drainage rate based on the calibrated drainage rate, the variance change of the average voltage of the stack, the change in water content, the change in the difference between the hydrogen pressure and the ambient pressure, the change in the air flow value, and the change in the ambient temperature value, the formula is as described above, where: Indicates the target drainage rate, reflecting the drainage rate that the hydrogen fuel cell system should achieve under given conditions. Indicates the calibrated drainage speed, that is, the drainage speed obtained by calibration under standard conditions. Indicates the variance change of the average voltage of the battery stack, reflecting the degree of fluctuation of the battery stack voltage. Indicates the change in water content, reflecting the degree of fluctuation of water content in the hydrogen fuel cell system. Indicates the change in the difference between hydrogen pressure and ambient pressure, Indicates the change in air flow value, reflecting the degree of influence on oxygen supply and temperature distribution in hydrogen fuel cell system. Indicates the ambient temperature value, reflecting the degree of influence on the temperature distribution and water evaporation rate in the hydrogen fuel cell system. 、 is a constant coefficient and can be obtained by combining fuzzy algorithm with PID (proportional-integral-derivative control).

[0066] In a specific embodiment, for 、 The process of obtaining is as follows: For example: two input quantities of the fuzzy controller can be set, which are the variance change of the average voltage of the battery stack And the average voltage standard deviation of the battery stack At the same time, the two output quantities of the fuzzy controller can be set, namely the proportional coefficient FuzzyKp1 and the integral coefficient FuzzyKi1 of the PID control; further, after obtaining the proportional coefficient FuzzyKp1 and the integral coefficient FuzzyKi1, the pre-set proportional coefficient calibration quantity Kp1, the integral coefficient calibration quantity Ki1 and the fuzzy weight can be weighted with FuzzyKp1 and FuzzyKi1, and the calculation can be performed according to the PID expression to obtain =ΔVa*Kp1+∫(ΔVa*Ki1*dt), after formula transformation, we can get Similarly, the two input quantities of the fuzzy controller can be set as 、 , or 、 , or 、 , or 、 At the same time, by setting the output corresponding to different input quantities, the corresponding proportional coefficient and integral coefficient can be obtained. Furthermore, the pre-set proportional coefficient calibration quantity, integral coefficient calibration and fuzzy weight are weighted with the corresponding proportional coefficient and integral coefficient, and the calculation is performed according to the PID expression to obtain 、 .

[0067] Furthermore, in the process of fuzzy controller operation, the input and output are fuzzified. Specifically, if the input is and , you can set The fuzzy domain is [0,840], and its fuzzy subsets are {NB, NM, NS, ZO, PS, PM, PB}, which respectively indicate that the range of prediction error is {negative large, negative medium, negative small, zero, positive small, positive medium, positive large}; At the same time, you can set The fuzzy domain of the output quantity FuzzyKp1 is [-10,10] (calibration quantity), and its fuzzy subsets are {NB,NM,NS,ZO,PS,PM,PB}, which respectively indicate that the range of the change in the prediction error is {negative large, negative medium, negative small, zero, positive small, positive medium, positive large}; the fuzzy domain of the output quantity FuzzyKp1 is [-10,10] (calibration quantity), and its fuzzy subsets are {NB,NM,NS,ZO,PS,PM,PB}, which respectively indicate that the range of the change in the prediction error is {extremely small, very small, relatively small, moderate, relatively large, very large, extremely large}, and the fuzzy domain of FuzzyKi1 is [-1,1] (calibration quantity), its fuzzy subsets are {NB, NM, NS, ZO, PS, PM, PB}, which respectively represent the range of the prediction error change as {extremely small, very small, relatively small, moderate, relatively large, very large, extremely large}. Among them, the membership functions of NB, NM, NS, ZO, PS, PM, and PB all adopt triangular membership functions, and the fuzzy rules are expressed in the language form of "IF-THEN". A total of 49 fuzzy rules constitute the control rule table of the fuzzy controller, and the fuzzy reasoning adopts the Mamdani reasoning method, that is, taking the minimum value of the membership function, and the center of gravity method (taking the weighted average) is used to defuzzify the designed fuzzy controller to obtain the output value of the fuzzy controller.

[0068] In one embodiment of the present invention, the operating state of the drain valve is controlled based on the target drainage speed so that the water content is maintained within a preset water content range, including: querying a third preset table based on the target drainage speed to determine the target opening value of the drain valve, and controlling the opening of the drain valve based on the target opening value so that the water content is maintained within the preset water content range, wherein the third preset table contains multiple correspondences between the target drainage speed and the target opening value.

[0069] Specifically, when controlling the operating state of the drain valve based on the target drainage rate, the drain valve opening can be controlled to maintain the water content within a preset water content range. For example, a third preset table can be traversed (i.e., row by row or record by record) until a target drain valve opening value corresponding to the target drainage rate is found, and the drain valve opening is controlled based on the target opening value. It will be understood that the third preset table stores multiple sets of correspondences between target drainage rates and target drain valve opening values. That is, each row or record in the third preset table represents a specific combination of target drainage rate and target drain valve opening value. The third preset table can be derived through experimental measurement, simulation calculation, or empirical formula.

[0070] In summary, according to the drainage control method of the hydrogen fuel cell system according to the embodiment of the present invention, the operating state of the drain valve can be accurately controlled according to the water content and target drainage speed of the hydrogen fuel cell system to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and causing the stack to flood, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the hydrogen fuel cell system from being corroded and damaged due to excessive water accumulation, helping to extend the service life of the hydrogen fuel cell and reduce maintenance and replacement costs. Furthermore, by establishing a corresponding relationship between the humidity value and the air flow value, the air temperature value, and the ambient temperature value, the humidity value of the hydrogen fuel cell system can be accurately determined according to the air flow value, the air temperature value, and the ambient temperature value, and thus the water content of the hydrogen fuel cell system can be accurately determined, thereby facilitating the control of the operating state of the drain valve to maintain the water content within a reasonable range, further improving the stability of the hydrogen fuel cell system, preventing the stack from flooding, extending the service life of the hydrogen fuel cell, and reducing maintenance and replacement costs.

[0071] A further embodiment of the present invention provides a drainage control device 100 for a hydrogen fuel cell system, such as Figure 2 As shown, the drainage control device 100 of the hydrogen fuel cell system includes: a determination module 110 and a control module 120 .

[0072] Specifically, the determination module 110 is used to determine the water content and target water drainage rate of the hydrogen fuel cell system.

[0073] The control module 120 is configured to control the operating state of the drain valve based on the target drainage speed so as to maintain the water content within a preset water content range.

[0074] In some embodiments, when determining the water content of the hydrogen fuel cell system, the determination module 110 is specifically used to: obtain the high-frequency impedance of the fuel cell stack and the humidity value of the hydrogen fuel cell system; and determine the water content based on the humidity value and the high-frequency impedance of the fuel cell stack.

[0075] In some embodiments, when obtaining the humidity value of the hydrogen fuel cell system, the determination module 110 is specifically used to: obtain the air flow value, air temperature value and ambient temperature value of the environment in which the hydrogen fuel cell system is located; based on the air flow value, air temperature value and ambient temperature value, query the first preset table to determine the humidity of the fuel cell stack, wherein the first preset table contains multiple correspondences about air flow value-air temperature value-ambient temperature value-humidity value.

[0076] In some embodiments, determining the water content based on the humidity value and the high-frequency impedance of the stack includes:

[0077] ;

[0078] in, is the water content, is a constant coefficient, is the high-frequency impedance of the stack, is the air flow value, is the air temperature value, is the ambient temperature value.

[0079] In some embodiments, when determining the target drainage speed of the hydrogen fuel cell system, the determination module 110 is specifically used to: obtain the calibrated drainage speed, the variance change of the average voltage of the fuel cell stack, the change in water content, the change in the difference between the hydrogen pressure and the ambient pressure of the hydrogen fuel cell system, the change in the air flow value, and the change in the ambient temperature value; determine the target drainage speed based on the calibrated drainage speed, the variance change of the average voltage of the fuel cell stack, the change in water content, the change in the difference between the hydrogen pressure and the ambient pressure, the change in the air flow value, and the change in the ambient temperature value.

[0080] In some embodiments, when obtaining the calibrated drainage speed, the determination module 110 is specifically used to: obtain the power instruction issued by the vehicle-mounted controller to the hydrogen fuel cell system; determine the current target value of the fuel cell stack based on the power instruction; and query the second preset table based on the current target value to determine the calibrated drainage speed, wherein the second preset table contains multiple correspondences between the current target value and the calibrated drainage speed.

[0081] In some embodiments, determining a target drainage rate based on a calibrated drainage rate, a variance change in the average voltage of the stack, a change in water content, a change in the difference between hydrogen pressure and ambient pressure, a change in air flow rate, and a change in ambient temperature includes:

[0082] ;

[0083] in, is the target drainage rate, To calibrate the drainage speed, is the variance change of the average voltage of the battery stack, is the change in water content, is the change in the difference between hydrogen pressure and ambient pressure, is the change in air flow rate, is the change in ambient temperature, 、 is a constant coefficient.

[0084] In some embodiments, when controlling the operating state of the drain valve based on the target drainage speed so as to maintain the water content within a preset water content range, the control module 120 is specifically used to: query a third preset table based on the target drainage speed to determine the target opening value of the drain valve, and control the opening of the drain valve based on the target opening value so as to maintain the water content within the preset water content range, wherein the third preset table contains multiple correspondences between the target drainage speed and the target opening value.

[0085] According to the drainage control device 100 of the hydrogen fuel cell system of the present invention, the operating state of the drain valve can be accurately controlled based on the water content of the hydrogen fuel cell system and the target drainage rate to maintain the water content within a reasonable range, thereby preventing excessive water accumulation in the hydrogen fuel cell system and flooding of the fuel cell stack, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent corrosion and damage to the hydrogen fuel cells caused by excessive water accumulation in the hydrogen fuel cell system, helping to extend the service life of the hydrogen fuel cells and reduce maintenance and replacement costs. Furthermore, by establishing a corresponding relationship between humidity value and air flow value, air temperature value, and ambient temperature value, the humidity value of the hydrogen fuel cell system can be accurately determined based on the air flow value, air temperature value, and ambient temperature value, and thus the water content of the hydrogen fuel cell system can be accurately determined, thereby facilitating the control of the operating state of the drain valve to maintain the water content within a reasonable range, further improving the stability of the hydrogen fuel cell system, preventing flooding of the fuel cell stack, extending the service life of the hydrogen fuel cell, and reducing maintenance and replacement costs.

[0086] A further embodiment of the present invention also discloses a vehicle, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores drainage control instructions for a hydrogen fuel cell system that can be executed by the at least one processor, and when the drainage control instructions for the hydrogen fuel cell system are executed by the at least one processor, the at least one processor implements the drainage control method for the hydrogen fuel cell system as described in the first aspect of the present invention.

[0087] According to the vehicle of the embodiment of the present invention, the operating state of the drain valve can be accurately controlled according to the water content of the hydrogen fuel cell system and the target drainage speed to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and causing the stack to flood, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the hydrogen fuel cell system from being corroded and damaged due to excessive water accumulation, thereby helping to extend the service life of the hydrogen fuel cell and reduce maintenance and replacement costs. Furthermore, by establishing a corresponding relationship between the humidity value and the air flow value, the air temperature value and the ambient temperature value, the humidity value of the hydrogen fuel cell system can be accurately determined according to the air flow value, the air temperature value and the ambient temperature value, and then the water content of the hydrogen fuel cell system can be accurately determined, thereby facilitating the control of the operating state of the drain valve to maintain the water content within a reasonable range, further improving the stability of the hydrogen fuel cell system, preventing the stack from flooding, extending the service life of the hydrogen fuel cell, and reducing maintenance and replacement costs.

[0088] A further embodiment of the present invention also discloses a computer-readable storage medium, which stores a drainage control program for a hydrogen fuel cell system. When the drainage control program for the hydrogen fuel cell system is executed by a processor, the drainage control method for the hydrogen fuel cell system as described in any of the above embodiments of the present invention is implemented.

[0089] According to an embodiment of the present invention, when a computer-readable storage medium stores a drainage control program for a hydrogen fuel cell system and is executed by a processor, the operating state of the drain valve can be precisely controlled based on the water content and target drainage rate of the hydrogen fuel cell system to maintain the water content within a reasonable range, thereby preventing excessive water accumulation in the hydrogen fuel cell system and flooding of the fuel cell stack, thereby maintaining the normal operation of the hydrogen fuel cell system. Furthermore, the system can prevent corrosion and damage to the hydrogen fuel cells caused by excessive water accumulation, thereby helping to extend the service life of the hydrogen fuel cells and reduce maintenance and replacement costs. Furthermore, by establishing a corresponding relationship between humidity values ​​and air flow values, air temperature values, and ambient temperature values, the humidity value of the hydrogen fuel cell system can be precisely determined based on the air flow values, air temperature values, and ambient temperature values, thereby accurately determining the water content of the hydrogen fuel cell system. This facilitates controlling the operating state of the drain valve to maintain the water content within a reasonable range, further improving the stability of the hydrogen fuel cell system, preventing flooding of the fuel cell stack, extending the service life of the hydrogen fuel cells, and reducing maintenance and replacement costs.

[0090] A further embodiment of the present invention further discloses a computer program, which, when executed, implements the drainage control method of the hydrogen fuel cell system as described in any of the above embodiments of the present invention.

[0091] According to the computer program of the embodiment of the present invention, when executed, the computer program can accurately control the operating state of the drain valve based on the water content and target drainage rate of the hydrogen fuel cell system to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and flooding of the fuel cell stack, thereby maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent corrosion and damage to the hydrogen fuel cells caused by excessive water accumulation in the hydrogen fuel cell system, helping to extend the service life of the hydrogen fuel cells and reduce maintenance and replacement costs. Furthermore, by establishing a corresponding relationship between humidity value and air flow value, air temperature value, and ambient temperature value, the humidity value of the hydrogen fuel cell system can be accurately determined based on the air flow value, air temperature value, and ambient temperature value, and thus the water content of the hydrogen fuel cell system can be accurately determined, thereby facilitating the control of the operating state of the drain valve to maintain the water content within a reasonable range, further improving the stability of the hydrogen fuel cell system, preventing flooding of the fuel cell stack, extending the service life of the hydrogen fuel cell, and reducing maintenance and replacement costs.

[0092] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0093] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A drainage control method for a hydrogen fuel cell system, characterized in that: The following steps are involved: Obtaining the high-frequency impedance of the fuel cell stack and the humidity value of the hydrogen fuel cell system; determining the water content of the hydrogen fuel cell system based on the humidity value and the high-frequency impedance of the fuel cell stack; Obtaining a calibrated drainage rate, a variance change of an average voltage of the fuel cell stack, a change in the water content, a change in the difference between the hydrogen pressure of the hydrogen fuel cell system and the ambient pressure, a change in the air flow value, and a change in the ambient temperature value; Determining a target drainage rate based on the calibrated drainage rate, a variance change of the average voltage of the fuel cell stack, a change in the water content, a change in the difference between the hydrogen pressure and the ambient pressure, a change in the air flow value, and a change in the ambient temperature value; The operation state of the drain valve is controlled based on the target drainage speed so that the water content is maintained within a preset water content range.

2. The drainage control method of the hydrogen fuel cell system according to claim 1, characterized in that: Obtaining a humidity value of the hydrogen fuel cell system, including: Obtaining the air flow value, air temperature value and ambient temperature value of the environment in which the hydrogen fuel cell system is located; The humidity of the fuel cell stack is determined by querying a first preset table based on the air flow value, the air temperature value and the ambient temperature value, wherein the first preset table contains multiple sets of correspondences of air flow value-air temperature value-ambient temperature value-humidity value.

3. The drainage control method of the hydrogen fuel cell system according to claim 2, characterized in that: Determining the water content based on the humidity value and the high-frequency impedance of the fuel cell stack includes: ； in, is the water content, is a constant coefficient, is the high-frequency impedance of the stack, is the air flow value, is the air temperature value, is the ambient temperature value.

4. The drainage control method of the hydrogen fuel cell system according to claim 1, characterized in that: Get the calibrated drainage rate, including: Obtaining a power instruction issued by an onboard controller to the hydrogen fuel cell system; determining a current target value of the fuel cell stack according to the power instruction; The calibrated drainage speed is determined by querying a second preset table according to the current target value, wherein the second preset table contains a plurality of corresponding relationships between current target values ​​and calibrated drainage speeds.

5. The drainage control method of the hydrogen fuel cell system according to claim 1, characterized in that: The determining the target drainage rate based on the calibrated drainage rate, the variance change of the average voltage of the fuel cell stack, the change in the water content, the change in the difference between the hydrogen pressure and the ambient pressure, the change in the air flow value, and the change in the ambient temperature value includes: ； in, is the target drainage rate, is the calibrated drainage velocity, is the variance change of the average voltage of the battery stack, is the change in water content, is the change in the difference between the hydrogen pressure and the ambient pressure, is the change in the air flow value, is the change in the ambient temperature value, 、 is a constant coefficient.

6. The drainage control method of the hydrogen fuel cell system according to claim 1, characterized in that: Controlling the operating state of the drain valve based on the target drainage speed so as to maintain the water content within a preset water content range includes: Based on the target drainage speed, a third preset table is queried to determine the target opening value of the drain valve, and the opening of the drain valve is controlled based on the target opening value to maintain the water content within a preset water content range, wherein the third preset table contains multiple sets of correspondences between target drainage speeds and target opening values.

7. A drainage control device for a hydrogen fuel cell system, characterized in that: The drainage control device of the hydrogen fuel cell system includes: a determination module, configured to obtain the high-frequency impedance of the fuel cell stack and the humidity value of the hydrogen fuel cell system, and determine the water content of the hydrogen fuel cell system based on the humidity value and the high-frequency impedance of the fuel cell stack; obtain a calibrated drainage speed, a variance change of the average voltage of the fuel cell stack, a change in the water content, a change in the difference between the hydrogen pressure and the ambient pressure of the hydrogen fuel cell system, a change in the air flow value, and a change in the ambient temperature value, and determine a target drainage speed based on the calibrated drainage speed, the variance change of the average voltage of the fuel cell stack, the change in the water content, the change in the difference between the hydrogen pressure and the ambient pressure, the change in the air flow value, and the change in the ambient temperature value; A control module is used to control the operating state of the drain valve based on the target drainage speed so that the water content is maintained within a preset water content range.

8. A vehicle, characterized in that: include: The drainage control device of the hydrogen fuel cell system according to claim 7, or A processor, a memory, and a drainage control program for a hydrogen fuel cell system stored in the memory and executable on the processor, wherein the drainage control program for the hydrogen fuel cell system, when executed by the processor, implements the drainage control method for the hydrogen fuel cell system as described in any one of claims 1 to 6.

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