Drainage control method and device of hydrogen fuel cell system and vehicle

Abstract

The invention discloses a drainage control method and device of a hydrogen fuel cell system and a vehicle. The method comprises the steps that the water content and the target drainage speed of the hydrogen fuel cell system are determined; and controlling the operation state of the drainage valve based on the target drainage speed, so that the water content is maintained in a preset water content range. The running state of the drainage 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 in a reasonable range, the phenomenon that an electric pile is flooded due to excessive accumulated water of the hydrogen fuel cell system is avoided, the normal running of the hydrogen fuel cell system is maintained, and meanwhile, the service life of the hydrogen fuel cell system is prolonged. The corrosion and damage of the hydrogen fuel cell caused by excessive accumulated water in the hydrogen fuel cell system can be prevented, the service life of the hydrogen fuel cell can be prolonged, and the maintenance and replacement cost can be reduced.

Description

Technical Field

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

[0002] In recent years, the global energy crisis and environmental pollution problems have become increasingly severe. In the automotive industry, fuel cell engines are regarded as the ultimate solution due to their environmental friendliness and high energy utilization efficiency. However, a large amount of liquid water is generated during operation. If the water content in the fuel cell stack is too high, it will reduce the performance of the fuel cell stack and damage its lifespan.

[0003] In the prior art, the control scheme commonly adopted in the fuel cell industry is to set the opening frequency of the drainage valve at a fixed period according to the stack voltage. However, there are fluctuations between the stack voltage and the water production amount, 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, easily affecting the drainage of the fuel cell, causing a flooding phenomenon, affecting the normal operation of the fuel cell, and leading to the damage of 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 provide a drainage control method for a hydrogen fuel cell system, which can accurately control the operating state of the drainage valve according to the water content and the target drainage speed of the hydrogen fuel cell system, so as to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system, preventing the fuel cell stack from being flooded, maintaining the normal operation of the hydrogen fuel cell system, and at the same time, preventing the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation, helping to extend the service life of the hydrogen fuel cell, and reducing the 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] To achieve the above object, an embodiment of the first aspect of the present invention provides a drainage control method for a hydrogen fuel cell system, including: determining the water content of the hydrogen fuel cell system and a target drainage speed; controlling the operating state of a drainage valve based on the target drainage speed so that the water content is maintained within a preset water content range.

[0011] According to the drainage control method of the hydrogen fuel cell system in the embodiment of the present invention, the operating state of the drainage 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 preventing the phenomenon of waterlogging in the fuel cell stack, thus maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation, contribute to extending the service life of the hydrogen fuel cell, and reduce the 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 further have the following additional technical features: In some examples, determining the water content of the 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; determining the water content based on the humidity value and the high-frequency impedance of the fuel cell stack.

[0013] 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 where 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, where there are multiple corresponding relationships of air flow value - air temperature value - ambient temperature value - humidity value in the first preset table.

[0014] In some examples, determining the water content based on the humidity value and the high-frequency impedance of the fuel cell stack includes: ; wherein, is the water content, is a constant coefficient, is the high-frequency impedance of the fuel cell stack, is the air flow value, is the air temperature value, is the ambient temperature value.

[0015] In some examples, determining the target drainage speed of the hydrogen fuel cell system includes: obtaining the calibrated drainage speed, the variance change of the average voltage of the stack, the change of the water content, the change of the difference between the hydrogen pressure and the ambient pressure of the hydrogen fuel cell system, the change of the air flow value, and the change of the ambient temperature value; determining the target drainage speed based on the calibrated drainage speed, the variance change of the average voltage of the stack, the change of the water content, the change of the difference between the hydrogen pressure and the ambient pressure, the change of the air flow value, and the change of the ambient temperature value.

[0016] In some examples, obtaining the calibrated drainage speed includes: obtaining the power command issued by the vehicle-mounted controller to the hydrogen fuel cell system; determining the target current value of the stack according to the power command; querying a second preset table according to the target current value to determine the calibrated drainage speed, where there are multiple corresponding relationships between the target current value and the calibrated drainage speed in the second preset table.

[0017] In some examples, the determining the target drainage speed based on the calibrated drainage speed, the variance change of the average voltage of the stack, the change of the water content, the change of the difference between the hydrogen pressure and the ambient pressure, the change of the air flow value, and the change of the ambient temperature value includes: ; where, is the target drainage speed, is the calibrated drainage speed, is the variance change of the average voltage of the stack, is the change of the water content, is the change of the difference between the hydrogen pressure and the ambient pressure, is the change of the air flow value, is the change of the ambient temperature value, 、 are constant coefficients.

[0018] In some examples, controlling the operating state of the drain valve based on the target drainage speed to keep the water content within a preset water content range includes: 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 to keep the water content within a preset water content range, where there are multiple corresponding relationships between the target drainage speed and the target opening value in the third preset table.

[0019] To achieve the above object, an embodiment of the second aspect of the present invention provides a drainage control device for a hydrogen fuel cell system, including: a determination module configured to determine the water content and the target drainage speed of the hydrogen fuel cell system; and a control module configured to control the operating state of a drainage valve based on the target drainage speed so as to maintain the water content within a preset water content range.

[0020] According to the drainage control device for a hydrogen fuel cell system of the present invention, the operating state of the drainage valve can be accurately controlled according to the water content and the target drainage speed of the hydrogen fuel cell system, so as to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and preventing the phenomenon of waterlogging in the fuel cell stack, thus maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, contribute to extending the service life of the hydrogen fuel cell, and reduce the maintenance and replacement costs.

[0021] To achieve the above object, an embodiment of the third aspect of the present invention provides a vehicle, including: the drainage control device for a hydrogen fuel cell system described in the above embodiment.

[0022] According to the vehicle of the embodiment of the present invention, the operating state of the drainage valve can be accurately controlled according to the water content and the target drainage speed of the hydrogen fuel cell system, so as to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and preventing the phenomenon of waterlogging in the fuel cell stack, thus maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, contribute to extending the service life of the hydrogen fuel cell, and reduce the maintenance and replacement costs.

[0023] A further embodiment of the present invention further discloses a computer-readable storage medium, on which a drainage control program for a hydrogen fuel cell system is stored. When the drainage control program for the hydrogen fuel cell system is executed by a processor, it implements the drainage control method for a hydrogen fuel cell system described in any of the above embodiments of the present invention.

[0024] According to the computer-readable storage medium of the embodiment of the present invention, when the drainage control program for the hydrogen fuel cell system stored thereon is executed by a processor, the operating state of the drainage valve can be accurately controlled according to the water content and the target drainage speed of the hydrogen fuel cell system, so as to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and preventing the phenomenon of waterlogging in the fuel cell stack, thus maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, contribute to extending the service life of the hydrogen fuel cell, and reduce the maintenance and replacement costs.

[0025] A further embodiment of the present invention also discloses a computer program, which, when executed, implements the drainage control method of the hydrogen fuel cell system described in any of the above embodiments of the present invention.

[0026] 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 drainage 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 preventing the phenomenon of waterlogging in the fuel cell stack, so as to maintain the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, help to extend the service life of the hydrogen fuel cell, and reduce the maintenance and replacement costs.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic flowchart of a drainage control method for a hydrogen fuel cell system according to an embodiment of the present invention; Figure 2 is a schematic structural diagram of a drainage control device for a hydrogen fuel cell system according to an embodiment of the present invention.

[0029] Reference Signs: Drainage control device for hydrogen fuel cell system - 100; Determination module - 110; Control module - 120. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to be able to understand the features and technical content of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below with reference to the drawings. The attached drawings are for reference and illustration only, and are not used to limit the embodiments of the present invention. In the following technical description, for the sake of explanation, numerous details are provided to give a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details.

[0031] Next, reference is made to Figure 1 - Figure 2 to describe a drainage control method, device, and vehicle for a hydrogen fuel cell system according to an embodiment of the present invention.

[0032] Figure 1 is a schematic flowchart of a drainage control method for a hydrogen fuel cell system according to an embodiment of the present invention. As Figure 1As shown, the method includes the following steps: As Figure 1 As shown, the drainage control method of the hydrogen fuel cell system includes the following steps: Step S1: Determine the water content of the hydrogen fuel cell system and the target drainage rate.

[0033] Specifically, when performing drainage control on the hydrogen fuel cell system, the current water content of the hydrogen fuel cell system (i.e., the content of liquid water) can be determined. The determination methods include, but are not limited to, using a humidity sensor or a moisture sensor to measure the water content in the stack or related components of the hydrogen fuel cell system, and combining the operating parameters of the hydrogen fuel cell system, such as current, voltage, temperature, etc., to obtain the water content of the hydrogen fuel cell system through an algorithm model. Further, the target drainage rate of the hydrogen fuel cell system can be determined in combination with the water content of the hydrogen fuel cell system, so as to control the operating state of the drainage valve based on the target drainage rate.

[0034] Step S2: Control the operating state of the drainage valve based on the target drainage rate to maintain the water content within a preset water content range.

[0035] Specifically, after determining the water content of the hydrogen fuel cell system and the target drainage rate, the operating state of the drainage valve can be controlled based on the target drainage rate, including but not limited to controlling the opening degree of the drainage valve, or controlling the opening time and opening frequency of the exhaust valve, so as to maintain the water content within a preset water content range. For example, the currently monitored current water content can be compared with the preset water content range. If the current water content is higher than the upper limit value of the preset water content range, it means that the water content is relatively high at this time, and there is a risk of flooding in the stack of the hydrogen fuel cell system. The drainage rate can be increased to reduce the water content and prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, thereby extending the service life of the hydrogen fuel cell. If the current water content is lower than the lower limit value of the preset water content range, it means that the drainage rate can be reduced or the drainage can be stopped to avoid the problem of hydrogen fuel cell damage caused by excessive drying.

[0036] Thus, the above-mentioned drainage control method of the hydrogen fuel cell system can accurately control the operating state of the drainage valve according to the water content of the hydrogen fuel cell system and the target drainage rate, so as to maintain the water content within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and causing the phenomenon of flooding in the stack, so as to maintain the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, help to extend the service life of the hydrogen fuel cell, and reduce the maintenance and replacement costs.

[0037] In an embodiment of the present invention, determining the water content of a hydrogen fuel cell system includes: obtaining the high-frequency impedance of the stack and the humidity value of the hydrogen fuel cell system; determining the water content based on the humidity value and the high-frequency impedance of the stack.

[0038] Specifically, since the high-frequency impedance is the impedance characteristic of the stack under high-frequency alternating current signals, in a hydrogen fuel cell, the high-frequency impedance of the stack can reflect the moisture state inside the hydrogen fuel cell. For example, when the moisture inside the hydrogen fuel cell is moderate, the high-frequency impedance can present a relatively stable value. If there is too much moisture in the hydrogen fuel cell, it can lead to an increase in the wetting degree of the membrane electrode, thus affecting the value of the high-frequency impedance; on the contrary, if there is too little moisture in the hydrogen fuel cell, the membrane electrode may be too dry, which will also change the reading of the high-frequency impedance. At the same time, the humidity value of the hydrogen fuel cell system occupies an important proportion in 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 stack can be obtained through a CVW (Cell Voltage Monitor), and 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 in combination with a preset algorithm.

[0039] Further, after obtaining the high-frequency impedance and the humidity value, the water content of the hydrogen fuel cell system can be determined according to the high-frequency impedance and the humidity value, including but not limited to establishing a formula or a machine learning model, using the high-frequency impedance and the humidity value as input variables and the water content as the output variable to accurately obtain the water content of the hydrogen fuel cell system under different conditions.

[0040] In an embodiment of the present invention, obtaining the humidity value of the hydrogen fuel cell system includes: obtaining the air flow value, the air temperature value, and the ambient temperature value of the environment where the hydrogen fuel cell system is located; querying a first preset table based on the air flow value, the air temperature value, and the ambient temperature value to determine the humidity of the stack, where there are multiple corresponding relationships of air flow value - air temperature value - ambient temperature value - humidity value in the first preset table.

[0041] 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 where the hydrogen fuel cell system is located can be obtained. Among them, the air flow can be measured by an air flow meter in the hydrogen fuel cell system; the air temperature value can be measured by an air temperature sensor; the ambient temperature value can be measured by a temperature sensor. It can be understood that the change in air flow can affect the water distribution and temperature distribution of the hydrogen fuel cell system, and thus affect the humidity value; the change in air temperature can affect the saturation degree of moisture in the air, thereby affecting the humidity value; the change in ambient temperature can affect the water evaporation and condensation processes of the hydrogen fuel cell system, and thus affect the humidity value.

[0042] Further, after obtaining the air flow value, air temperature value, and ambient temperature value, the first preset table can be traversed (i.e., checked line by line or record by record) until the humidity value corresponding to the air flow value, air temperature value, and ambient temperature value is found. It can be understood that the first preset table stores multiple sets of corresponding relationships between the air flow value - air temperature value - ambient temperature value - humidity value, that is, each row or each record in the first preset table represents a combination of a specific air flow value, air temperature value, ambient temperature value, and humidity value. Among them, the first preset table can be obtained through experimental measurement, simulation calculation, or empirical formula.

[0043] In an embodiment of the present invention, determining the water content based on the humidity value and the high-frequency impedance of the stack includes: ; Wherein, 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.

[0044] 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. Among them, represents the water content, that is, the content of liquid water in the hydrogen fuel cell system, which can reflect the amount of moisture in the hydrogen fuel cell system, represents the constant coefficient, which can be calibrated according to experiments or theoretical analyses and can reflect the linear relationship between the high-frequency impedance and the water content, represents the high-frequency impedance of the stack, which can reflect the impedance characteristics of the stack under high-frequency alternating current signals, represents the air flow value, that is, the magnitude of the air flow entering the hydrogen fuel cell system, represents the air temperature value, that is, the temperature of the air entering the hydrogen fuel cell system, Represents the ambient temperature value, i.e., the temperature of the environment where the hydrogen fuel cell system is located.

[0045] In one embodiment of the present invention, determining the target drainage speed of the hydrogen fuel cell system includes: obtaining the calibrated drainage speed, the variance change of the average voltage of the stack, the change of the water content, the change of the difference between the hydrogen pressure and the ambient pressure of the hydrogen fuel cell system, the change of the air flow value, and the change of the ambient temperature value; determining the target drainage speed based on the calibrated drainage speed, the variance change of the average voltage of the stack, the change of the water content, the change of the difference between the hydrogen pressure and the ambient pressure, the change of the air flow value, and the change of the ambient temperature value.

[0046] 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 of the water content, the change of the difference between the hydrogen pressure and the ambient pressure of the hydrogen fuel cell system, the change of the air flow value, and the change of the ambient temperature value can be obtained. Among them, the calibrated drainage speed can be obtained according to the actual situation, including but not limited to querying the corresponding data table; the change of the water content can be obtained by comparing the real-time detected water content with the pre-calibrated water content; while the variance change of the average voltage of the stack, the change of the difference between the hydrogen pressure and the ambient pressure of the hydrogen fuel cell system, the change of the air flow value, and the change of the ambient temperature value can be calculated through the algorithms preset inside the FCU (Fuel-cell Control Unit) on the basis of obtaining the corresponding data through the corresponding sensors. For example, the real-time average voltage of the stack can be obtained through a voltage sensor and uploaded to the FCU, and the FCU can calculate the variance of the average voltage of the stack according to the variance algorithm and perform algorithm operations with the pre-calibrated variance of the average voltage of the stack to obtain the variance change of the average voltage of the stack.

[0047] Further, after obtaining 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 of the hydrogen fuel cell system, the change in the air flow value, and the change in the ambient temperature value, the target drainage rate can be determined 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 of the hydrogen fuel cell system, the change in the air flow value, and the change in the ambient temperature value, including but not limited to establishing a formula or a machine learning model, using 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 of the hydrogen fuel cell system, the change in the air flow value, and the change in the ambient temperature value as input variables, and the target drainage rate as the output variable, so as to accurately obtain the target drainage rate of the hydrogen fuel cell system under different conditions.

[0048] In an embodiment of the present invention, obtaining the calibrated drainage rate includes: obtaining the power command sent by the vehicle-mounted controller to the hydrogen fuel cell system; determining the current target value of the stack according to the power command; querying a second preset table according to the current target value to determine the calibrated drainage rate, where there are multiple corresponding relationships between the current target value and the calibrated drainage rate in the second preset table.

[0049] Specifically, when obtaining the calibrated drainage rate, the vehicle-mounted controller can send a power command to the hydrogen fuel cell system according to the driving requirements of the vehicle, the state of the hydrogen fuel cell, etc., to meet the driving or other power consumption requirements of the vehicle; further, the hydrogen fuel cell system can parse the power command to obtain the current target value of the stack; further, after obtaining the current target value of the stack, the second preset table can be traversed (i.e., checked row by row or record by record) until the calibrated drainage rate corresponding to the current target value of the stack is found. It can be understood that there are multiple groups of corresponding relationships between the current target value and the calibrated drainage rate of the stack stored in the second preset table, that is, each row or each record in the second preset table represents a combination of a specific current target value and a calibrated drainage rate of the stack, where the second preset table can be obtained through experimental measurement, simulation calculation, or empirical formula.

[0050] In an embodiment of the present invention, 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 includes: ; wherein, is the target drainage rate, is the calibrated drainage rate, is the variance change of the average voltage of the 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.

[0051] 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 represents the target drainage rate, which reflects the drainage rate that the hydrogen fuel cell system should achieve under given conditions, represents the calibrated drainage rate, that is, the drainage rate obtained through calibration under standard environment, represents the variance change of the average voltage of the stack, which reflects the voltage fluctuation degree of the stack, represents the change in water content, which reflects the water content fluctuation degree in the hydrogen fuel cell system, represents the change in the difference between the hydrogen pressure and the ambient pressure, represents the change in the air flow value, which reflects the influence degree on the oxygen supply and temperature distribution in the hydrogen fuel cell system, represents the ambient temperature value, which reflects the influence degree on the temperature distribution and water evaporation rate in the hydrogen fuel cell system, 、 are constant coefficients, which can be obtained through the fuzzy algorithm combined with PID (proportional-integral-derivative control).

[0052] In a specific embodiment, for 、 the acquisition process is as follows. Taking as an example: Two input variables of the fuzzy controller can be set, which are the variance change of the average voltage of the stack and the standard deviation of the average voltage of the stack , meanwhile, two output values of the fuzzy controller can be set, which are the proportional coefficient FuzzyKp1 and the integral coefficient FuzzyKi1 of the PID control respectively; further, after obtaining the proportional coefficient FuzzyKp1 and the integral coefficient FuzzyKi1, the preset proportional coefficient calibration value Kp1, the integral coefficient calibration value Ki1 and the fuzzy weight can be weighted with FuzzyKp1 and FuzzyKi1, and calculated according to the PID expression, and then =ΔVa*Kp1+∫(ΔVa*Ki1*dt), and through formula transformation, we can get , similarly, two input values of the fuzzy controller can be set, which are respectively 、 , or 、 , or 、 , or 、 , meanwhile, by setting the output values corresponding to different input values, the corresponding proportional coefficient and integral coefficient can be obtained. Further, the preset proportional coefficient calibration value, the integral coefficient calibration and the fuzzy weight are weighted with the corresponding proportional coefficient and integral coefficient, and calculated according to the PID expression, then 、 can be obtained.

[0053] Further, during the operation of the fuzzy controller, it includes the fuzzification of the input and output values. Specifically, if the input values are and , the fuzzy domain of can be set as [0, 840], and its fuzzy subsets are {NB, NM, NS, ZO, PS, PM, PB}, which respectively represent that the range of the prediction error is {negative large, negative medium, negative small, zero, positive small, positive medium, positive large}; meanwhile, The fuzzy universe of discourse is [-60, 60] (calibrated value), and its fuzzy subsets are {NB, NM, NS, ZO, PS, PM, PB}, representing the ranges of the change in prediction error as {negative large, negative medium, negative small, zero, positive small, positive medium, positive large} respectively; then the fuzzy universe of discourse of the output FuzzyKp1 is [-10, 10] (calibrated value), and its fuzzy subsets are {NB, NM, NS, ZO, PS, PM, PB}, representing the ranges of the change in prediction error as {extremely small, very small, slightly small, moderate, slightly large, very large, extremely large} respectively. The fuzzy universe of discourse of FuzzyKi1 is [-1, 1] (calibrated value), and its fuzzy subsets are {NB, NM, NS, ZO, PS, PM, PB}, representing the ranges of the change in prediction error as {extremely small, very small, slightly small, moderate, slightly large, very large, extremely large} respectively. Among them, the membership functions of NB, NM, NS, ZO, PS, PM, PB all adopt triangular membership functions, and the fuzzy rules are expressed in the "IF-THEN" language form. A total of 49 fuzzy rules form the control rule table of the fuzzy controller, and Mamdani inference method is used for fuzzy inference, that is, taking the minimum value of the membership function, and the centroid method (taking the weighted average) is used to defuzzify the designed fuzzy controller to obtain the output value of the fuzzy controller.

[0054] In an embodiment of the present invention, the operating state of the drain valve is controlled based on the target drainage speed to maintain the water content 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 to maintain the water content within a preset water content range, wherein there are multiple corresponding relationships between the target drainage speed and the target opening value in the third preset table.

[0055] Specifically, when controlling the operating state of the drain valve based on the target drainage speed, the opening of the drain valve can be controlled to maintain the water content within a preset water content range. For example, the third preset table can be traversed (i.e., checked row by row or record by record) until the target opening value of the drain valve corresponding to the target drainage speed is found, and the opening of the drain valve is controlled according to the target opening value. It can be understood that there are multiple groups of corresponding relationships between the target drainage speed and the target opening value of the drain valve stored in the third preset table, that is, each row or each record in the third preset table represents a combination of a specific target drainage speed and the target opening value of the drain valve. Among them, the third preset table can be obtained through experimental measurement, simulation calculation or empirical formula.

[0056] In summary, according to the drainage control method of the hydrogen fuel cell system in the embodiments 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, so that the water content is maintained within a reasonable range, thereby avoiding excessive water accumulation in the hydrogen fuel cell system and preventing the phenomenon of flooding in the stack, thus maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, contribute to extending the service life of the hydrogen fuel cell, and reduce the maintenance and replacement costs. Further, by establishing the corresponding relationship between the humidity value, air flow value, air temperature value, and ambient temperature value, the humidity value of the hydrogen fuel cell system can be accurately determined according to the air flow value, air temperature value, and ambient temperature value, and then the water content of the hydrogen fuel cell system can be accurately determined, so as to facilitate the control of the operating state of the drain valve, maintain the water content within a reasonable range, further improve the stability of the hydrogen fuel cell system, prevent the phenomenon of flooding in the stack, extend the service life of the hydrogen fuel cell, and reduce the maintenance and replacement costs.

[0057] A further embodiment of the present invention provides a drainage control device 100 for a hydrogen fuel cell system, as Figure 2 shown. The drainage control device 100 for the hydrogen fuel cell system includes: a determination module 110 and a control module 120.

[0058] Specifically, the determination module 110 is used to determine the water content and the target drainage speed of the hydrogen fuel cell system.

[0059] The control module 120 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.

[0060] 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 stack and the humidity value of the hydrogen fuel cell system; determine the water content based on the humidity value and the high-frequency impedance of the stack.

[0061] 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 where the hydrogen fuel cell system is located; query a first preset table based on the air flow value, air temperature value, and ambient temperature value to determine the humidity of the stack, where there are multiple corresponding relationships between the air flow value - air temperature value - ambient temperature value - humidity value in the first preset table.

[0062] In some embodiments, determining the water content based on the humidity value and the high-frequency impedance of the stack includes: ; wherein, 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.

[0063] In some embodiments, when determining the target drainage speed of the hydrogen fuel cell system, the determining module 110 is specifically configured to: obtain the calibrated drainage speed, the variance change of the average voltage of the stack, the change of the water content, the change of the difference between the hydrogen pressure and the ambient pressure of the hydrogen fuel cell system, the change of the air flow value, and the change of the ambient temperature value; determine the target drainage speed based on the calibrated drainage speed, the variance change of the average voltage of the stack, the change of the water content, the change of the difference between the hydrogen pressure and the ambient pressure, the change of the air flow value, and the change of the ambient temperature value.

[0064] In some embodiments, when obtaining the calibrated drainage speed, the determining module 110 is specifically configured to: obtain the power command issued by the vehicle-mounted controller to the hydrogen fuel cell system; determine the target current value of the stack according to the power command; query the second preset table according to the target current value to determine the calibrated drainage speed, where there are multiple corresponding relationships between the target current value and the calibrated drainage speed in the second preset table.

[0065] In some embodiments, determining the target drainage speed based on the calibrated drainage speed, the variance change of the average voltage of the stack, the change of the water content, the change of the difference between the hydrogen pressure and the ambient pressure, the change of the air flow value, and the change of the ambient temperature value includes: ; wherein, is the target drainage speed, is the calibrated drainage speed, is the variance change of the average voltage of the stack, is the change of the water content, is the change of the difference between the hydrogen pressure and the ambient pressure, is the change of the air flow value, is the change of the ambient temperature value, 、 is a constant coefficient.

[0066] In some embodiments, when 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, the control module 120 is specifically configured 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 to maintain the water content within the preset water content range, where there are multiple corresponding relationships between the target drainage speed and the target opening value in the third preset table.

[0067] 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 according to the water content and the target drainage speed of the hydrogen fuel cell system, 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 phenomenon of waterlogging in the fuel cell stack, thus maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, help extend the service life of the hydrogen fuel cell, and reduce the maintenance and replacement costs. Further, by establishing the corresponding relationship between the humidity value, 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, so as to facilitate the control of the operating state of the drain valve, maintain the water content within a reasonable range, further improve the stability of the hydrogen fuel cell system, prevent the phenomenon of waterlogging in the fuel cell stack, extend the service life of the hydrogen fuel cell, and reduce the maintenance and replacement costs.

[0068] 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 of the hydrogen fuel cell system that can be executed by the at least one processor, and when the drainage control instructions of the hydrogen fuel cell system are executed by the at least one processor, the at least one processor is caused to implement the drainage control method of the hydrogen fuel cell system as described in the first aspect embodiment of the present invention above.

[0069] A vehicle according to an embodiment of the present invention can accurately control the operating state of a drain valve according to the water content of a hydrogen fuel cell system and a 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 preventing the phenomenon of waterlogging in the fuel cell stack, thus maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, contribute to extending the service life of the hydrogen fuel cell, and reduce maintenance and replacement costs. Further, by establishing the correspondence relationship between the humidity value, air flow value, air temperature value, and ambient temperature value, the humidity value of the hydrogen fuel cell system can be accurately determined according to the air flow value, air temperature value, and ambient temperature value, and then the water content of the hydrogen fuel cell system can be accurately determined, so as to facilitate the control of the operating state of the drain valve, maintain the water content within a reasonable range, further improve the stability of the hydrogen fuel cell system, prevent the phenomenon of waterlogging in the fuel cell stack, extend the service life of the hydrogen fuel cell, and reduce maintenance and replacement costs.

[0070] A further embodiment of the present invention also discloses a computer-readable storage medium, on which a drainage control program for a hydrogen fuel cell system is stored. When the drainage control program for the hydrogen fuel cell system is executed by a processor, it implements the drainage control method for the hydrogen fuel cell system described in any one of the above embodiments of the present invention.

[0071] A computer-readable storage medium according to an embodiment of the present invention, when the drainage control program for the hydrogen fuel cell system stored thereon is executed by a processor, can accurately control the operating state of a drain valve according to the water content of the hydrogen fuel cell system and a 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 preventing the phenomenon of waterlogging in the fuel cell stack, thus maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, contribute to extending the service life of the hydrogen fuel cell, and reduce maintenance and replacement costs. Further, by establishing the correspondence relationship between the humidity value, air flow value, air temperature value, and ambient temperature value, the humidity value of the hydrogen fuel cell system can be accurately determined according to the air flow value, air temperature value, and ambient temperature value, and then the water content of the hydrogen fuel cell system can be accurately determined, so as to facilitate the control of the operating state of the drain valve, maintain the water content within a reasonable range, further improve the stability of the hydrogen fuel cell system, prevent the phenomenon of waterlogging in the fuel cell stack, extend the service life of the hydrogen fuel cell, and reduce maintenance and replacement costs.

[0072] A further embodiment of the present invention also discloses a computer program, which implements the drainage control method for the hydrogen fuel cell system described in any one of the above embodiments of the present invention when executed.

[0073] According to the computer program of the embodiment of the present invention, when the computer program is executed, it 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 preventing the phenomenon of waterlogging in the fuel cell stack, thus maintaining the normal operation of the hydrogen fuel cell system. At the same time, it can prevent the corrosion and damage of the hydrogen fuel cell caused by excessive water accumulation in the hydrogen fuel cell system, help extend the service life of the hydrogen fuel cell, and reduce the maintenance and replacement costs. Further, by establishing the correspondence 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. Furthermore, the water content of the hydrogen fuel cell system can be accurately determined, so as to facilitate the control of the operating state of the drain valve, maintain the water content within a reasonable range, further improve the stability of the hydrogen fuel cell system, prevent the phenomenon of waterlogging in the fuel cell stack, extend the service life of the hydrogen fuel cell, and reduce the maintenance and replacement costs.

[0074] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0075] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present 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: determining a water content and a target water drainage rate of the hydrogen fuel cell system; The operation state of the drain valve is controlled based on the target drain 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: Determining the water content of the hydrogen fuel cell system, comprising: Obtaining the high-frequency impedance of the fuel cell stack and the humidity value of the hydrogen fuel cell system; The water content is determined based on the humidity value and a high frequency impedance of the stack.

3. The drainage control method of the hydrogen fuel cell system according to claim 2, characterized in that: Obtaining a humidity value of the hydrogen fuel cell system, comprising: 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 corresponding relationships of air flow value-air temperature value-ambient temperature value-humidity value.

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

5. The water discharge control method of the hydrogen fuel cell system according to claim 1, characterized in that: Determining a target water discharge rate of the hydrogen fuel cell system includes: Obtaining the calibrated drainage speed, the variance change of the average voltage of the stack, the change of the water content, the change of the difference between the hydrogen pressure and the ambient pressure of the hydrogen fuel cell system, the change of the air flow value and the change of the ambient temperature value; The target drainage speed is determined 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.

6. The water discharge control method of the hydrogen fuel cell system according to claim 5, characterized in that: Get the calibrated drainage velocity, including: 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 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.

7. The water discharge control method of the hydrogen fuel cell system according to claim 5, characterized in that: The determining the target drainage speed based on the calibrated drainage speed, the variance change of the average voltage of the stack, the change of the water content, the change of the difference between the hydrogen pressure and the ambient pressure, the change of the air flow value, and the change of 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.

8. The water discharge 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 that the water content is maintained 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 based on the target opening value, the opening of the drain valve is controlled to maintain the water content within a preset water content range, wherein the third preset table contains multiple correspondences between target drainage speed and target opening value.

9. A drainage control device for a hydrogen fuel cell system, characterized in that: The drainage control device of the hydrogen fuel cell system comprises: A determination module, used to determine the water content and target drainage rate of the hydrogen fuel cell system; 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.

10. A vehicle, characterized in that: include: The drainage control device of the hydrogen fuel cell system as claimed in claim 9, 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 8.

Images