Drainage control method and device of fuel cell system and electronic equipment

Abstract

The invention discloses a drainage control method and device of a fuel cell system and electronic equipment. The method comprises the following steps: receiving a drainage control request; in response to the drainage control request, determining a current fluctuation value corresponding to a hydrogen pump in the fuel cell system; under the condition that the current fluctuation value is greater than a preset threshold value, determining an initial opening and closing frequency corresponding to a drain valve in the fuel cell system and an electric pile density value corresponding to an electric pile in the fuel cell system; determining a target opening and closing frequency according to the initial opening and closing frequency, the stack density value and the current fluctuation value; and controlling the drain valve to open and close at the target opening and closing frequency. According to the invention, the technical problem of abnormal drainage easily existing in a fuel cell system in the related technology is solved.

Description

Technical Field

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

[0002] During the normal operation of the fuel cell system at room temperature, a large amount of liquid water will be generated on the anode side. Especially during low-power operation, the switching frequency of the anode side drain valve is slow, and liquid water will accumulate inside the hydrogen circulation pump (referred to as "hydrogen pump") of the fuel cell anode circuit. At low electrical density points, the speed of the hydrogen pump is low, and a large amount of liquid water accumulates inside the hydrogen pump and cannot be discharged, resulting in abnormal noise problems. In severe cases, the hydrogen pump itself and the stack assembly may be damaged.

[0003] Therefore, the fuel cell system in the related art is prone to abnormal drainage problems.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a drainage control method, device and electronic equipment for a fuel cell system, so as to at least solve the technical problem of drainage abnormality that is easily present in the fuel cell system of the related art.

[0006] According to one aspect of an embodiment of the present invention, a drainage control method for a fuel cell system is provided, comprising: receiving a drainage control request; determining a current fluctuation value corresponding to a hydrogen pump in the fuel cell system in response to the drainage control request; determining an initial opening and closing frequency corresponding to a drainage valve in the fuel cell system, and a stack density value corresponding to a fuel cell stack in the fuel cell system when the current fluctuation value is greater than a predetermined threshold; determining a target opening and closing frequency based on the initial opening and closing frequency, the stack density value and the current fluctuation value; and controlling the drainage valve to open and close at the target opening and closing frequency.

[0007] Optionally, before receiving the drainage control request, it also includes: receiving a target operation request, wherein the target operation request carries a target power; in response to the target operation request, determining the stack density value based on the target power and the attribute parameters of the stack; determining a target water production rate and a target hydrogen pump speed corresponding to the stack density value; controlling the stack to inject water into the hydrogen pump at the target water production rate, and controlling the hydrogen pump to rotate at the target hydrogen pump speed.

[0008] Optionally, in response to the drainage control request, determining the current fluctuation value corresponding to the hydrogen pump in the fuel cell system includes: in response to the drainage control request, determining the response time in response to the target operation request; when the response time is greater than a predetermined time, determining the current fluctuation value corresponding to the hydrogen pump.

[0009] Optionally, determining the target water production rate corresponding to the battery stack density value includes: determining an average battery stack voltage corresponding to the battery stack, and a molar mass of water; and determining the target water production rate based on the target power, the average battery stack voltage, and the molar mass.

[0010] Optionally, determining the target switching frequency based on the initial switching frequency, the battery stack density value and the current fluctuation value includes: determining a target water production rate based on the battery stack density value; determining an adjustment index for the initial switching frequency based on the target water production rate and the current fluctuation value; and adjusting the initial switching frequency based on the adjustment index to obtain the target switching frequency.

[0011] Optionally, after controlling the drain valve to open and close at the target opening and closing frequency, the method further includes: determining an updated current fluctuation value corresponding to the hydrogen pump; and sending fault information to a predetermined terminal when the updated current fluctuation value is greater than a predetermined threshold.

[0012] Optionally, determining the target opening and closing frequency based on the initial opening and closing frequency, the battery stack density value and the current fluctuation value includes: determining a target correlation between the opening and closing frequency of the drain valve and a predetermined current fluctuation value under the battery stack density value, wherein the target correlation includes an inversely proportional correlation between the predetermined current fluctuation value and the opening time of the opening and closing frequency of the drain valve under the battery stack density value, and a directly proportional correlation between the predetermined current fluctuation value and the closing time of the opening and closing frequency of the drain valve under the battery stack density value; determining the target opening and closing frequency corresponding to the battery stack density value from the target correlation.

[0013] Optionally, when the current fluctuation value is greater than a predetermined threshold, before determining the initial opening and closing frequency corresponding to the drain valve in the fuel cell system and the stack density value corresponding to the fuel cell stack in the fuel cell system, it also includes: determining the abnormal sound index corresponding to each of the fuel cell system under multiple sample current fluctuation values; determining the predetermined threshold based on the abnormal sound index corresponding to each of the multiple sample current fluctuation values.

[0014] According to one aspect of an embodiment of the present invention, a drainage control device for a fuel cell system is provided, comprising: a receiving module for receiving a drainage control request; a first determination module for determining, in response to the drainage control request, a current fluctuation value corresponding to a hydrogen pump in the fuel cell system; a second determination module for determining, when the current fluctuation value is greater than a predetermined threshold, an initial opening and closing frequency corresponding to a drainage valve in the fuel cell system and a stack density value corresponding to a stack in the fuel cell system; a third determination module for determining a target opening and closing frequency based on the initial opening and closing frequency, the stack density value and the current fluctuation value; and a control module for controlling the drainage valve to open and close at the target opening and closing frequency.

[0015] According to one aspect of an embodiment of the present invention, an electronic device is provided, comprising: a processor; and a memory for storing requests executable by the processor; wherein the processor is configured to execute the request to implement a drainage control method for a fuel cell system as described in any one of the above.

[0016] According to one aspect of an embodiment of the present invention, a computer-readable storage medium is provided, comprising: when a request in the computer-readable storage medium is executed by a processor of an electronic device, the electronic device is enabled to execute a drainage control method for a fuel cell system as described in any one of the above.

[0017] In an embodiment of the present invention, a drainage control request is received, and in response to the drainage control request, a current fluctuation value corresponding to a hydrogen pump in a fuel cell system is determined. When the current fluctuation value is greater than a predetermined threshold value, the initial opening and closing frequency corresponding to a drainage valve in the fuel cell system and the stack density value corresponding to a stack in the fuel cell system are determined, so as to achieve the purpose of determining a target opening and closing frequency based on the initial opening and closing frequency, the stack density value and the current fluctuation value, and controlling the drainage valve to open and close at the target opening and closing frequency. Since the current fluctuation value is obtained by monitoring the hydrogen pump in the fuel cell system, by determining the current fluctuation value, the operating state of the hydrogen pump in the fuel cell system can be monitored in real time, and according to the magnitude of the current fluctuation value, the working state of the hydrogen pump can be reflected, which is helpful to find faults or abnormalities in the hydrogen pump. For example, when the current fluctuation value is large, it means that more water needs to be drained, and drainage abnormalities may occur. Through the magnitude of the current fluctuation value, the safe and stable operation of the fuel cell system can be ensured to a certain extent, and the requirements of hydrogen pump drainage control can be met, thereby solving the technical problem of drainage abnormalities that are easy to exist in the fuel cell system of the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 is a flow chart of a drainage control method of a fuel cell system according to an embodiment of the present invention;

[0020] Figure 2 4 is a structural block diagram of a drainage control device for a fuel cell system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] Example 1

[0024] According to an embodiment of the present invention, an embodiment of a drainage control method for a fuel cell system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from that shown here.

[0025] Figure 1 is a flow chart of a drainage control method of a fuel cell system according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0026] Step S102, receiving a drainage control request;

[0027] In step S102 provided in the present application, a drainage control request of a hydrogen pump in a fuel cell system is received, which can be received through sensor data input or the like. After receiving the request, further operations such as analyzing the information carried in the request and verifying the validity of the request are performed. For example, the drainage control request is generated after a chemical reaction occurs in the hydrogen fuel cell stack, and the water generated flows into a hydrogen pump connected to the stack outlet. When there is too much water in the hydrogen pump, certain abnormal conditions will occur, and drainage operations are required at this time.

[0028] Step S104, in response to the drainage control request, determining a current fluctuation value corresponding to a hydrogen pump in the fuel cell system;

[0029] In step S104 provided in the present application, in response to the above-mentioned drainage control request, sensor data related to the hydrogen pump is further obtained, that is, the current fluctuation value of the hydrogen pump is further determined. In this process, the current fluctuation value of the hydrogen pump can be monitored by other devices such as a controller connected to the hydrogen pump circulation pump, and a certain judgment basis is provided for subsequent abnormal problems of the hydrogen pump.

[0030] It should be noted that by determining the current fluctuation value, the operating status of the hydrogen pump in the fuel cell system can be monitored in real time, and according to the size of the current fluctuation value, the working condition of the hydrogen pump can be reflected, which is helpful to discover the fault or abnormality of the hydrogen pump. To a certain extent, it can ensure the safe and stable operation of the fuel cell system and meet the needs of hydrogen pump drainage control.

[0031] Step S106, when the current fluctuation value is greater than a predetermined threshold, determining an initial opening and closing frequency corresponding to the drain valve in the fuel cell system and a stack density value corresponding to the stack in the fuel cell system;

[0032] In step S106 provided in the present application, it can be determined whether the current fluctuation value determined in the above steps exceeds the predetermined threshold value. If the current fluctuation value exceeds the predetermined threshold value, the initial opening and closing frequency corresponding to the drain valve in the fuel cell system is determined. In this process, the setting of the predetermined threshold value is not limited here and can be determined based on the design parameters and performance of the fuel cell and the specific value of the current fluctuation value.

[0033] It should be noted that the above-mentioned stack density value can be one of the important indicators of fuel cell system performance, which is used to measure the power output capacity of the stack per unit area. The initial stack density value of the stack can be determined according to the design and control strategy of the stack. By determining the initial opening and closing frequency of the drain valve in the fuel cell system and the stack density value of the stack, it can help to achieve stable operation of the fuel cell system to a certain extent, maintain the normal working state and hydrogen supply of the fuel cell system, and improve the performance and reliability of the fuel cell system.

[0034] Step S108, determining the target switching frequency according to the initial switching frequency, the stack density value and the current fluctuation value;

[0035] In step S108 provided in the present application, based on the initial switching frequency, battery stack density value, and current fluctuation value determined in the above steps, combined with actual conditions and control strategies, the switching frequency is adjusted to cope with current fluctuations. The setting of the target switching frequency can be determined based on the characteristics and requirements of the system. The purpose is to maintain the stability of the system and reduce the impact of current fluctuations on system performance. That is, by real-time monitoring of the current fluctuation value and feeding back different switching frequency changes to the system, the switching frequency can be gradually adjusted so that the target switching frequency approaches the optimal value that can effectively cope with current fluctuations.

[0036] It should be noted that by reasonably determining the target opening and closing frequency, it can help maintain the stability of the fuel cell system. Reasonable control of the opening and closing frequency can not only reasonably remove excess water inside the hydrogen pump, but also avoid excessive fluctuations in the pressure of the fuel cell system, reduce the possibility of oscillation and instability of the fuel cell system, and ensure the reliable operation of the fuel cell system.

[0037] Step S110, controlling the drain valve to open and close at a target opening and closing frequency.

[0038] In step S110 provided in the present application, the difference between the target opening and closing frequency determined in the above steps and the initial opening and closing frequency can be determined. According to the size of the difference, the opening and closing state of the drain valve is adjusted to gradually approach the target opening and closing frequency. For example, if the current frequency is lower than the target opening and closing frequency, the opening and closing frequency can be appropriately increased. Further, the opening and closing state of the drain valve can be continuously monitored and adjusted, and necessary adjustments can be made according to actual conditions and the response of the fuel cell system to make the opening and closing frequency of the drain valve as close to the target opening and closing frequency as possible. Through such a control method, the drain valve can be accurately controlled according to the target opening and closing frequency.

[0039] It should be noted that by controlling according to the target opening and closing frequency, the stability of the fuel cell system can be guaranteed to a certain extent, ensuring that the drain valve is opened and closed at a determined frequency, which helps to avoid excessive pressure fluctuations or instability in the system and reduce the risk of system oscillation and failure.

[0040] Through the above steps S102-S110, a drainage control request is received, and in response to the drainage control request, the current fluctuation value corresponding to the hydrogen pump in the fuel cell system is determined. When the current fluctuation value is greater than a predetermined threshold, the initial opening and closing frequency corresponding to the drainage valve in the fuel cell system and the stack density value corresponding to the stack in the fuel cell system are determined, so as to achieve the purpose of determining the target opening and closing frequency according to the initial opening and closing frequency, the stack density value and the current fluctuation value, and controlling the drainage valve to open and close at the target opening and closing frequency. Since the current fluctuation value is obtained by monitoring the hydrogen pump in the fuel cell system, by determining the current fluctuation value, the operating state of the hydrogen pump in the fuel cell system can be monitored in real time, and according to the size of the current fluctuation value, the working condition of the hydrogen pump can be reflected, which is helpful to find the fault or abnormality of the hydrogen pump. For example, when the current fluctuation value is large, it means that more water needs to be drained, and drainage abnormality may occur. Through the size of the current fluctuation value, to a certain extent, the safe and stable operation of the fuel cell system can be ensured, the demand for drainage control of the hydrogen pump can be met, and the technical problem of drainage abnormality that is easy to exist in the fuel cell system of the related technology is solved.

[0041] The above method of this embodiment is further introduced below.

[0042] As an optional embodiment, before receiving the drainage control request, it also includes: receiving a target operation request, wherein the target operation request carries a target power; in response to the target operation request, determining a stack density value based on the target power and attribute parameters of the stack; determining a target water production rate and a target hydrogen pump speed corresponding to the stack density value; controlling the stack to inject water into the hydrogen pump at the target water production rate, and controlling the hydrogen pump to rotate at the target hydrogen pump speed.

[0043] In this embodiment, the target power may be the desired output power of the fuel cell system. Obtaining the target power may be used for subsequent control adjustments. The stack density value may be determined based on the target power and the attribute parameters of the stack, so it is not limited here.

[0044] Before receiving the drainage control request, the following steps are included: receiving a target operation request, determining the stack density value, determining the target water production rate and the target hydrogen pump speed, and controlling the stack water injection and hydrogen pump speed. First, a target operation request is received, which carries the target power, and then the appropriate stack density value is determined according to the target power and the attribute parameters of the stack. Based on the determined stack density value, the target water production rate and the target hydrogen pump speed corresponding to the density value are further determined. The target water production rate refers to the desired water production rate, and the target hydrogen pump speed is to control the speed of the hydrogen pump in order to maintain the required water injection rate. After determining the target water production rate and the target hydrogen pump speed, the stack can be controlled to inject water into the hydrogen pump at the target water production rate, and the hydrogen pump can be controlled to rotate at the target hydrogen pump speed at the same time.

[0045] It should be noted that determining the target water production rate and the target hydrogen pump speed helps to control the water injection rate and hydrogen supply to meet the power requirements of the fuel cell system, thereby ensuring the stable operation of the fuel cell system and reducing problems caused by the mismatch between the water injection rate and the hydrogen supply, such as blockage or excessive water production.

[0046] As an optional embodiment, in response to a drainage control request, a current fluctuation value corresponding to a hydrogen pump in a fuel cell system is determined, including: in response to the drainage control request, determining a response time in response to a target operation request; when the response time is greater than a predetermined time, determining the current fluctuation value corresponding to the hydrogen pump.

[0047] In this embodiment, when a drainage control request is received, the current time is first recorded and compared with the predetermined target operation request to calculate the response time, that is, the time from receiving the drainage control request to actually responding to the target operation request; the calculated response time is compared with the predetermined time. If the response time is greater than the predetermined time, it means that the hydrogen circulation system has entered a stable period, during which the current fluctuation value should be less than the predetermined threshold. In this case, if the current fluctuation value is still greater than the predetermined threshold, it means that there is indeed a drainage abnormality. If the response time is less than the predetermined time, it means that the hydrogen circulation system may be in a fluctuation period, during which the current fluctuation value may be at a higher value. Therefore, in order to avoid misjudgment, the corresponding hydrogen pump current fluctuation value can be determined according to the characteristic parameters and control strategy of the system when the response time is greater than the predetermined time. In order to achieve the effect of accurately determining the drainage abnormality.

[0048] It should be noted that by determining the response time of the target operation request, the performance of the fuel cell system can be monitored and controlled in a timely manner and the operating status of the system can be adjusted, which helps to ensure that the system can respond to the drainage control request in a timely manner and take appropriate measures to maintain the stability of the system.

[0049] As an optional embodiment, determining a target water production rate corresponding to a stack density value includes: determining an average stack voltage corresponding to the stack, and a molar mass of water; and determining the target water production rate based on the target power, the average stack voltage, and the molar mass.

[0050] In this embodiment, the above-mentioned average voltage of the battery stack refers to the average voltage value generated by the battery stack under certain working conditions. The average voltage of the battery stack can be calculated according to the specific property parameters and working state of the system, and the above-mentioned molar mass of water refers to the mass of water per unit mole, usually expressed in grams / mole.

[0051] It should be noted that the required target water production rate can be calculated based on the set target power, average voltage of the stack and the molar mass of water. The water production rate is usually expressed in terms of the number of moles or mass of water produced per unit time, such as moles / hour or grams / hour. The target water production rate corresponding to the stack density value can be calculated based on the target power, average voltage of the stack and the molar mass of water. To a certain extent, the balance between the fuel cell system supply and the hydrogen supply can be maintained, avoiding problems such as excessive water or lack of water, and reducing fuel cell system failures and unstable operation.

[0052] As an optional embodiment, the target switching frequency is determined based on the initial switching frequency, the battery stack density value and the current fluctuation value, including: determining the target water production rate based on the battery stack density value; determining the adjustment index of the initial switching frequency based on the target water production rate and the current fluctuation value; and adjusting the initial switching frequency based on the adjustment index to obtain the target switching frequency.

[0053] In this embodiment, the above-mentioned adjustment index can be determined according to the specific requirements and control strategies of the fuel cell system, and is not limited here. For the above steps, according to the density value of the fuel cell stack, the target water production rate corresponding to the density value is determined using the aforementioned steps. By comparing the target water production rate with the current fluctuation value, an adjustment index can be determined to adjust the initial opening and closing frequency. Further, according to the determined adjustment index, the initial opening and closing frequency is adjusted accordingly to obtain the final target opening and closing frequency. The adjustment can be achieved by increasing or decreasing the initial opening and closing frequency to meet the requirements of the target water production rate and the current fluctuation value.

[0054] It should be noted that by using the adjustment index to adjust the initial opening and closing frequency, on the one hand, it helps to adjust the opening and closing frequency to match the current fluctuation value, thereby reducing the fluctuation and instability of the fuel cell system and improving the operating stability of the fuel cell system. On the other hand, it can enable the fuel cell system to more accurately control the water production rate, so that it can quickly respond to the needs of the fuel cell system and maintain a stable operating state.

[0055] As an optional embodiment, after controlling the drain valve to open and close at the target opening and closing frequency, it also includes: determining an updated current fluctuation value corresponding to the hydrogen pump; and sending fault information to a predetermined terminal when the updated current fluctuation value is greater than a predetermined threshold.

[0056] In this embodiment, for the above steps, the update current fluctuation value corresponding to the hydrogen pump can be determined according to the opening and closing frequency of the drain valve and the target water production rate, combined with the characteristics and design parameters of the system. This fluctuation value represents the range of change of the hydrogen pump current per unit time. Then, the determined update current fluctuation value is monitored in real time to determine whether it exceeds a predetermined threshold. If it is detected that the update current fluctuation value is greater than the predetermined threshold, the system can automatically generate fault information and send it to a predetermined terminal. This predetermined terminal can be a human-machine interface, a monitoring system or other appropriate equipment, so as to promptly notify relevant personnel to handle the fault.

[0057] It should be noted that the above steps can monitor the current fluctuation of the hydrogen pump and send fault information when the fluctuation value exceeds the threshold, which helps to timely identify and handle the abnormal situation of the hydrogen pump to ensure the stable operation and safety of the system. By determining the updated current fluctuation value corresponding to the hydrogen pump and monitoring it in real time, it is helpful to timely discover the abnormal situation of the hydrogen pump and adopt corresponding control strategies to drain the hydrogen pump.

[0058] As an optional embodiment, the target opening and closing frequency is determined based on the initial opening and closing frequency, the battery stack density value and the current fluctuation value, including: determining the target correlation between the opening and closing frequency of the drain valve and the predetermined current fluctuation value under the battery stack density value, wherein the target correlation includes an inversely proportional correlation between the predetermined current fluctuation value and the opening time of the opening and closing frequency of the drain valve under the battery stack density value, and a directly proportional correlation between the predetermined current fluctuation value and the closing time of the opening and closing frequency of the drain valve under the battery stack density value; from the target correlation, determine the target opening and closing frequency corresponding to the battery stack density value.

[0059] In this embodiment, for the above steps, the target opening and closing frequency can be determined based on the initial opening and closing frequency, the stack density value and the current fluctuation value. Specifically, the target correlation relationship between the opening and closing frequency of the drain valve and the predetermined current fluctuation value under the stack density value is retrieved. Thus, the target opening and closing frequency corresponding to the stack density value can be determined through the target correlation relationship. Since the target correlation relationship can be directly retrieved, the implementation process of the method provided by the present invention can be accelerated.

[0060] The above-mentioned target association relationship includes a relationship in which the predetermined current fluctuation value is proportional to the closing time in the opening and closing frequency of the drain valve under the stack density value, and a relationship in which the predetermined current fluctuation value is inversely proportional to the opening time in the opening and closing frequency of the drain valve under the stack density value, that is, under the same stack density value, the larger the predetermined current fluctuation value, the longer the closing time and the shorter the opening time in the target opening and closing frequency to be set, which is conducive to drainage in the fuel cell system and avoids abnormal drainage. Through the target association relationship, the changing trend of the predetermined current fluctuation value with the opening and closing frequency of the drain valve under a certain stack density value can be reflected to a certain extent, and then the opening and closing frequency of the drain valve can be adjusted accordingly according to its changing trend. By controlling the opening and closing frequency of the drain valve, the current fluctuation value can be kept within a reasonable range to ensure the stable operation of the hydrogen pump.

[0061] As an optional embodiment, when the current fluctuation value is greater than a predetermined threshold, before determining the initial opening and closing frequency corresponding to the drain valve in the fuel cell system and the stack density value corresponding to the fuel cell stack in the fuel cell system, it also includes: determining the abnormal sound index corresponding to the fuel cell system under multiple sample current fluctuation values; determining the predetermined threshold based on the abnormal sound index corresponding to the multiple sample current fluctuation values.

[0062] In this embodiment, when the fuel cell system operates normally and generates current fluctuations, multiple sample data are collected and the corresponding sound index is recorded. These sample data may include current fluctuation values ​​and corresponding sound indices under different load conditions. Then, by analyzing the collected sample data, the relationship between the current fluctuation value and the sound index can be understood. Based on the results of the data analysis, the abnormal sound index corresponding to the current fluctuation value greater than a predetermined threshold can be determined. According to the determined abnormal sound index, evaluation and comparison are performed under multiple sample current fluctuation values ​​to determine the predetermined threshold.

[0063] It should be noted that by monitoring the abnormal sound index in the fuel cell system, the presence of abnormal sound can be detected in time, that is, the abnormal sound index can be used as an early warning indicator. When the sound index exceeds a predetermined threshold, an alarm can be issued in time, which helps to improve the safety and reliability of the fuel cell system to a certain extent.

[0064] Based on the above embodiments and optional embodiments, an optional implementation is provided, which is described in detail below.

[0065] In the fuel cell system of related technology, it is easy to have the technical problem of abnormal drainage. For example, in the fuel cell system at room temperature, anode water accumulates inside the hydrogen pump and cannot be discharged in time, resulting in abnormal problems. In serious cases, the hydrogen pump itself and the fuel cell stack will be damaged, causing the system to be unable to operate normally. Therefore, it is easy to have the technical problem of abnormal drainage.

[0066] In view of this, a drainage control method for a fuel cell system is provided in an optional embodiment of the present invention. Table 1 is a table of calibration data of the fuel cell system during operation provided in an optional embodiment of the present invention.

[0067] (I) Table 1 is the calibration data of the fuel cell system during operation:

[0068] Table 1

[0069]

[0070]

[0071] (ii) Based on the above calibration data, the optional implementation methods of the present application are described in detail below.

[0072] S1. In response to a target operation request, determining a stack density value according to a target power and attribute parameters of the stack;

[0073] It should be noted that the stack density value can be determined according to the property parameters of the stack. For example, the stack density value in the superscript 1 can be 0.1, 0.2, etc.

[0074] S2. Determine the target water production rate and the target hydrogen pump speed corresponding to the stack density value;

[0075] It should be noted that the target water production rate can be determined by determining the average voltage of the battery stack corresponding to the battery stack and the molar mass of water. According to the target power, the average voltage of the battery stack and the molar mass, the formula is as follows:

[0076] Water generation rate = P e / (2V c F)mol·s -1 ;

[0077] Pe is the stack power, Vc is the average stack voltage, and F is the Faraday constant (96485.33289±0.00059C / mol, which can be taken as 96485);

[0078] The molar mass of water is known to be 18.02*10 -3 kg·mol -1 , then the above formula is transformed into:

[0079] Water generation rate = 18.02*10 -3 *P e / (2V c *96485)kg·s -1

[0080] =9.34*10 -8 *P e / V c kg·s -1 ;

[0081] S3, controlling the fuel cell stack to inject water into the hydrogen pump at a target water production rate, and controlling the hydrogen pump to rotate at a target hydrogen pump speed;

[0082] It should be noted that in the above steps, by determining the target water production rate, the fuel cell stack can be controlled to inject water into the hydrogen pump at the target water production rate. This process mainly requires that the layout position of the hydrogen pump is consistent with the actual layout position of the system and the whole vehicle. For example, the drain outlet is vertically downward, and the water injection position must be consistent with the actual water inlet position of the system and the whole vehicle. That is, the water produced after the chemical reaction in the fuel cell stack will be injected into the hydrogen pump inlet at a certain target water mixing rate.

[0083] S4, in response to the drainage control request, determining a current fluctuation value corresponding to a hydrogen pump in the fuel cell system;

[0084] It should be noted that, according to the target hydrogen pump speed in the above steps, the hydrogen pump speed is kept consistent with the actual speed of the system and the vehicle, and the hydrogen pump current fluctuation value is monitored and the current fluctuation value is recorded, and whether the hydrogen pump is abnormal is determined according to the current fluctuation value;

[0085] S5. Determine the initial opening and closing frequency of the drain valve and the stack density value corresponding to the stack according to the current fluctuation value and the predetermined threshold value;

[0086] It should be noted that the hydrogen pump speed is consistent with the actual speed of the system and the vehicle. For example, the hydrogen pump speed is 6000prm at a stack density value of 0.1, and the initial opening and closing frequency of the drain valve is determined so that the opening and closing frequency in the subsequent hydrogen pump abnormal drainage step can be adjusted.

[0087] S6. Determine the target opening and closing frequency based on the initial opening and closing frequency, the battery density value and the current fluctuation value, and control the drain valve to open and close at the target opening and closing frequency.

[0088] It should be noted that the hydrogen pump runs at a certain speed, the anode side drain valve is opened at a set frequency, the hydrogen pump current fluctuation value is monitored, and the current fluctuation value is recorded, and whether the hydrogen pump is abnormal is determined based on the current fluctuation value; if the current fluctuation value is greater than the predetermined threshold, the anode side drain valve is set with different frequencies, such as open 5ms, close 2ms or open 2ms, close 5ms. During this process, the current fluctuation value can be updated, and the corresponding target opening and closing frequency can be adjusted to control the drain valve to open and close at the target opening and closing frequency.

[0089] It should also be noted that when judging the size of the current fluctuation value and the predetermined threshold, the predetermined threshold can be set to 0.3A. According to the characteristics of the hydrogen pump controller, when the hydrogen pump current fluctuation value is greater than 0.3A, the system determines that there is an abnormality; when the hydrogen pump current fluctuation value is less than 0.3A, the system determines that there is no abnormality. The calibration value in the above Table 1 can also be input into the system software. The software will monitor the hydrogen pump current during the actual system and vehicle operation. When the hydrogen pump current fluctuation value is greater than 0.3A, the system determines that there is an abnormality. At this time, an instruction will be sent to the anode side drain valve to adjust the switching frequency. After the anode side drain valve adjusts the switching frequency as required, when the hydrogen pump current fluctuation value is less than 0.3A, the system determines that there is no abnormality.

[0090] Through the above optional implementation, at least the following beneficial effects can be achieved:

[0091] (1) Since the current fluctuation value is obtained by monitoring the hydrogen pump in the fuel cell system, that is, by determining the current fluctuation value, the operating state of the hydrogen pump in the fuel cell system can be monitored in real time, and the working condition of the hydrogen pump can be reflected according to the magnitude of the current fluctuation value, which is helpful to find the fault or abnormality of the hydrogen pump. To a certain extent, it can ensure the safe and stable operation of the fuel cell system and meet the demand for hydrogen pump drainage control;

[0092] (2) Since the stack density value can be determined based on the attribute parameters of the stack, that is, by determining the stack density value of the stack in the fuel cell system, it can help to achieve stable operation of the fuel cell system to a certain extent, maintain the normal working state and hydrogen supply of the fuel cell system, and improve the performance and reliability of the fuel cell system;

[0093] (3) Since the target opening and closing frequency is determined based on the initial opening and closing frequency, the stack density value and the current fluctuation value, that is, by reasonably determining the target opening and closing frequency, not only can the excess water inside the hydrogen pump be reasonably removed, but also excessive fluctuations in the pressure of the fuel cell system can be avoided, reducing the possibility of oscillation and instability of the fuel cell system, thereby ensuring the reliable operation of the fuel cell system.

[0094] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0095] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods of various embodiments of the present invention.

[0096] Example 2

[0097] According to an embodiment of the present invention, a device for implementing the drainage control method of the fuel cell system is also provided. Figure 2 is a structural block diagram of a drainage control device for a fuel cell system according to an embodiment of the present invention. Figure 2 As shown, the device includes: a receiving module 202, a first determining module 204, a second determining module 206, a third determining module 208 and a control module 210. The device is described in detail below.

[0098] A receiving module 202, configured to receive a drainage control request;

[0099] A first determination module 204, connected to the receiving module 202, for determining a current fluctuation value corresponding to a hydrogen pump in the fuel cell system in response to a drainage control request;

[0100] The second determination module 206 is connected to the first determination module 204, and is used to determine the initial opening and closing frequency corresponding to the drain valve in the fuel cell system and the stack density value corresponding to the stack in the fuel cell system when the current fluctuation value is greater than a predetermined threshold;

[0101] A third determination module 208, connected to the second determination module 206, is used to determine the target switching frequency according to the initial switching frequency, the stack density value and the current fluctuation value;

[0102] The control module 210 is connected to the third determination module 208 and is used to control the drain valve to open and close at a target opening and closing frequency.

[0103] It should be noted here that the above-mentioned receiving module 202, first determination module 204, second determination module 206, third determination module 208 and control module 210 correspond to steps S102 to S110 in the drainage control method for implementing the fuel cell system, and the examples and application scenarios implemented by the multiple modules and corresponding steps are the same, but are not limited to the contents disclosed in the above-mentioned embodiment 1.

[0104] Example 3

[0105] According to another aspect of an embodiment of the present invention, there is also provided an electronic device, comprising: a processor; and a memory for storing instructions executable by the processor, wherein the processor is configured to execute the instructions to implement any of the above drainage control methods for a fuel cell system.

[0106] Example 4

[0107] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided. When instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device can execute any of the above-mentioned drainage control methods for a fuel cell system.

[0108] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0109] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0110] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0111] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0112] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0113] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0114] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A drainage control method for a fuel cell system, characterized in that: include: receiving a drainage control request; In response to the water drainage control request, determining a current fluctuation value corresponding to a hydrogen pump in the fuel cell system; When the current fluctuation value is greater than a predetermined threshold, determining an initial opening and closing frequency corresponding to a drain valve in the fuel cell system and a stack density value corresponding to a stack in the fuel cell system; Determining a target switching frequency according to the initial switching frequency, the stack density value and the current fluctuation value; The drain valve is controlled to open and close at the target opening and closing frequency.

2. The method according to claim 1, characterized in that Before receiving the drainage control request, the method further includes: receiving a target operation request, wherein the target operation request carries a target power; In response to the target operation request, determining the stack density value according to the target power and the property parameters of the stack; Determining a target water production rate and a target hydrogen pump speed corresponding to the stack density value; The fuel cell stack is controlled to inject water into the hydrogen pump at the target water production rate, and the hydrogen pump is controlled to rotate at the target hydrogen pump speed.

3. The method according to claim 2, characterized in that The step of determining a current fluctuation value corresponding to a hydrogen pump in a fuel cell system in response to the drainage control request includes: In response to the drainage control request, determining a response time for responding to the target operation request; When the response time is greater than a predetermined time, the current fluctuation value corresponding to the hydrogen pump is determined.

4. The method according to claim 2, characterized in that: The determining of the target water production rate corresponding to the stack density value comprises: Determining an average voltage of the battery stack corresponding to the battery stack and a molar mass of water; The target water production rate is determined based on the target power, the average voltage of the fuel cell stack and the molar mass.

5. The method according to claim 1, characterized in that The determining of the target switching frequency according to the initial switching frequency, the stack density value and the current fluctuation value includes: Determining a target water production rate according to the stack density value; Determining an adjustment index for the initial opening and closing frequency according to the target water production rate and the current fluctuation value; The initial switching frequency is adjusted according to the adjustment index to obtain the target switching frequency.

6. The method according to claim 1, characterized in that After controlling the drain valve to open and close at the target opening and closing frequency, the method further includes: Determining an updated current fluctuation value corresponding to the hydrogen pump; When the updated current fluctuation value is greater than a predetermined threshold, fault information is sent to a predetermined terminal.

7. The method according to claim 1, characterized in that The determining of the target switching frequency according to the initial switching frequency, the stack density value and the current fluctuation value includes: Determine a target association relationship between the opening and closing frequency of the drain valve and a predetermined current fluctuation value under the battery stack density value, wherein the target association relationship includes an association relationship in which the predetermined current fluctuation value is inversely proportional to the opening time of the opening and closing frequency of the drain valve under the battery stack density value, and an association relationship in which the predetermined current fluctuation value is directly proportional to the closing time of the opening and closing frequency of the drain valve under the battery stack density value; The target switching frequency corresponding to the battery stack density value is determined from the target association relationship.

8. The method according to any one of claims 1 to 7, characterized in that Before determining the initial opening and closing frequency corresponding to the drain valve in the fuel cell system and the stack density value corresponding to the stack in the fuel cell system when the current fluctuation value is greater than a predetermined threshold, the method further includes: Determining abnormal sound indexes corresponding to the fuel cell system under multiple sample current fluctuation values; The predetermined threshold is determined according to the abnormal sound indexes respectively corresponding to the multiple sample current fluctuation values.

9. A drainage control device for a fuel cell system, characterized in that: include: A receiving module, used for receiving a drainage control request; A first determination module, configured to determine a current fluctuation value corresponding to a hydrogen pump in a fuel cell system in response to the drainage control request; A second determination module is used to determine an initial opening and closing frequency corresponding to the drain valve in the fuel cell system and a stack density value corresponding to the stack in the fuel cell system when the current fluctuation value is greater than a predetermined threshold; A third determination module is used to determine a target switching frequency according to the initial switching frequency, the stack density value and the current fluctuation value; The control module is used to control the drain valve to open and close at the target opening and closing frequency.

10. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the drainage control method of the fuel cell system according to any one of claims 1 to 8.

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