Emission Control Method and System for Fuel Cell

Abstract

The present application provides an emission control method and system for a fuel cell. The method includes: when the switch is in the closed state, obtaining the voltage and temperature of the fuel cell at the current moment to obtain a first battery voltage and a first battery temperature; according to the first battery voltage and the first battery temperature, adjusting the rotation speed of the fan and the opening and closing time of a second solenoid valve to adjust the temperature of the fuel cell when the switch is in the closed state to a predetermined temperature, and the opening and closing time of the second solenoid valve is used to represent the opening time and the closing time of the second solenoid valve in each control period. By adjusting the rotation speed of the fan and the opening and closing time of the second solenoid valve when the switch is in the closed state to adjust the temperature of the fuel cell when the switch is in the closed state to a predetermined temperature, the performance of the fuel cell can be optimized, and further the problem of how to avoid internal corrosion of the battery caused by the fuel cell being in a flooding failure for a long time is solved.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and in particular, to an emission control method and system for a fuel cell. Background Art

[0002] As a clean energy source in the 21st century, hydrogen energy has high fuel application efficiency and less environmental pollution. Fuel cells powered by hydrogen energy are considered to be the power generation devices with the greatest potential. Among them, Proton Exchange Membrane Fuel Cells (PEMFCs) have become one of the most promising new energy batteries at present due to their excellent performance such as fast startup, low operating temperature, high power density, and pollution-free products. In China, the research on fuel cells is relatively less and limited to expensive and bulky experimental instruments. The research on water fault diagnosis of fuel cells mainly stays at the external data analysis. Water faults have an important impact on the performance of fuel cells. In the process of the gradual commercialization of fuel cells, proposing an effective and feasible water fault diagnosis method helps to monitor the internal state of fuel cells.

[0003] Since the output characteristics of fuel cells are relatively soft, as the load current increases, the voltage drops and the drop ratio is more than that of general batteries. Especially as the power of PEMFCs increases, the stack is prone to flooding faults. When the PEMFC stack operates in a flooded state for a long time, it not only has a great impact on the performance and life of the stack, but also may appear in a dangerous operating state, causing harm to the operators. Therefore, the research on flooding has both scientific research value and practical engineering application value, and is a very important direction in the research of PEMFC stacks. As the output current increases, the internal electromigration of the stack increases, and more water is generated by the reaction. If the drainage effect of the stack is not good, it will lead to easy water accumulation on the cathode side, resulting in flooding.

[0004] During a flooding fault, the flooding fault only affects the single cell in the fuel cell stack where the flooding phenomenon occurs. Therefore, the overall voltage drop of the stack is not obvious, but the voltage of the flooded single cell will drop significantly, and ultimately it will lead to an irrecoverable decay of the stack performance and shorten the service life of the fuel cell. Being in a flooding fault for a long time will cause other side chemical reactions inside the battery and cause corrosion of the catalyst layer. If the corrosion impurities appear inside the exchange membrane, it may cause the battery to fail. Summary of the Invention

[0005] The main purpose of the present application is to provide an emission control method and system for a fuel cell to solve the problem of how to avoid internal corrosion of the battery caused by the fuel cell being in a flooding fault for a long time.

[0006] According to one aspect of an embodiment of the present invention, an emission control method for a fuel cell is provided. This method is applied to an emission control system of a fuel cell. The system includes a fuel cell, a blower, a first solenoid valve, a second solenoid valve, and a switch. The output end of the first solenoid valve is communicated with the intake end of the fuel cell. The output end of the fuel cell is communicated with the input end of the second solenoid valve. The electric energy output end of the fuel cell is electrically connected to the switch. The method includes: when the switch is in a closed state, obtaining the voltage and temperature of the fuel cell at the current moment to obtain a first battery voltage and a first battery temperature; according to the first battery voltage and the first battery temperature, adjusting the rotation speed of the blower and the opening and closing time of the second solenoid valve to adjust the temperature of the fuel cell to a predetermined temperature when the switch is in a closed state, wherein the state of the first solenoid valve remains open, and the opening and closing time of the second solenoid valve is used to represent the opening time and closing time of the second solenoid valve in each control cycle.

[0007] Optionally, the system further includes an air pump. The output end of the air pump is communicated with the input end of the first solenoid valve. The method further includes: when the switch is in an open state, obtaining the voltage of the fuel cell at the current moment to obtain a second battery voltage; according to the second battery voltage, adjusting the opening and closing time of the second solenoid valve and the opening and closing of the air pump to adjust the voltage of the fuel cell to reach a target range when the switch is in an open state.

[0008] Optionally, adjusting the opening and closing time of the second solenoid valve and the opening and closing of the air pump according to the second battery voltage includes: when the second battery voltage is less than a first predetermined voltage or the second battery voltage is greater than a second predetermined voltage, controlling the second solenoid valve in such a way that the opening time of the second solenoid valve is a first predetermined time period, and controlling the air pump to open. After the air pump is opened, the air pump starts to fill hydrogen into the fuel cell; after the first predetermined time period, controlling the second solenoid valve and the air pump to close.

[0009] Optionally, adjusting the opening and closing times of the second solenoid valve and the opening and closing of the air pump according to the second battery voltage includes: when the second battery voltage is less than a first predetermined voltage or the second battery voltage is greater than a second predetermined voltage, controlling the air pump to turn on, and alternately controlling the second solenoid valve in such a way that the cycle is a second predetermined time period, the opening time of the second solenoid valve is a third predetermined time period, and the closing time of the second solenoid valve is a fourth predetermined time period, where the second predetermined time period is less than the first predetermined time period, the third predetermined time period is less than the second predetermined time period, the fourth predetermined time period is greater than the third predetermined time period and less than the second predetermined time period; after the first predetermined time period has elapsed, controlling the air pump to turn off and controlling the second solenoid valve to remain closed.

[0010] Optionally, adjusting the opening and closing times of the second solenoid valve and the opening and closing of the air pump according to the second battery voltage includes: when the second battery voltage is less than a first predetermined voltage or the second battery voltage is greater than a second predetermined voltage, controlling the air pump to turn on and alternately controlling the second solenoid valve in such a way that the cycle is a fifth predetermined time period, the opening time of the second solenoid valve is a third predetermined time period, and the closing time of the second solenoid valve is a third predetermined time period; after the first predetermined time period has elapsed, controlling the air pump to turn off and controlling the second solenoid valve to remain closed; when the second battery voltage is less than a first predetermined voltage or the second battery voltage is greater than a second predetermined voltage, controlling the first solenoid valve, the second solenoid valve and the air pump to turn off and controlling an alarm to give an alarm.

[0011] Optionally, before obtaining the voltage and temperature of the fuel cell at the current moment to obtain the first battery voltage and the first battery temperature when the switch is in the closed state, the method further includes: when the voltage of the fuel cell when the switch is in the open state is greater than or equal to a first predetermined voltage and the voltage of the fuel cell when the switch is in the open state is less than or equal to a second predetermined voltage, controlling the switch to close.

[0012] Optionally, before adjusting the rotation speed of the fan and the opening and closing times of the second solenoid valve according to the first battery voltage and the first battery temperature, the method further includes: obtaining the fuel cell current at the current moment; determining a first predetermined opening time of the second solenoid valve according to the fuel cell current at the current moment; alternately controlling the second solenoid valve in such a way that the opening time of the second solenoid valve is the first predetermined opening time and the closing time of the second solenoid valve is a sixth predetermined time period, so that the voltage of the fuel cell when the switch is in the closed state remains within a predetermined range.

[0013] Optionally, determining the first predetermined opening time of the second solenoid valve according to the fuel cell current at the current moment includes: according to the first formula determine the first predetermined opening time, where I out is the fuel cell current at the current moment, and T on is the first predetermined opening time.

[0014] Optionally, the system further includes an air inflation pump, the output end of the air inflation pump is communicated with the input end of the first solenoid valve. Adjusting the rotation speed of the blower and the opening and closing time of the second solenoid valve according to the first battery voltage and the first battery temperature includes: when the first battery voltage is greater than or equal to a third predetermined voltage, taking the opening time of the second solenoid valve as the first predetermined opening time and the closing time of the second solenoid valve as a sixth predetermined time period to alternately control the second solenoid valve, and adjusting the rotation speed of the blower to adjust the temperature of the fuel cell to a first predetermined temperature when the switch is in the closed state; when the first battery voltage is less than the third predetermined voltage, the first battery voltage is greater than a fourth predetermined voltage, and the first predetermined opening time is greater than a time threshold, taking the opening time of the second solenoid valve as a second predetermined opening time and the closing time of the second solenoid valve as a sixth predetermined time period to alternately control the second solenoid valve, and adjusting the rotation speed of the blower to adjust the temperature of the fuel cell to a second predetermined temperature when the switch is in the closed state, where the second predetermined temperature is greater than the first predetermined temperature; when the first battery voltage is less than or equal to the fourth predetermined voltage, the first battery voltage is greater than a fifth predetermined voltage, and the first predetermined opening time is greater than the time threshold, taking the opening time of the second solenoid valve as a third predetermined opening time and the closing time of the second solenoid valve as a sixth predetermined time period to alternately control the second solenoid valve, and adjusting the rotation speed of the blower to adjust the temperature of the fuel cell to a third predetermined temperature when the switch is in the closed state, where the third predetermined temperature is greater than the second predetermined temperature; when the first battery voltage is less than or equal to the fifth predetermined voltage and the first battery voltage is greater than a sixth predetermined voltage, controlling the second solenoid valve to remain open and adjusting the rotation speed of the blower to adjust the temperature of the fuel cell to the third predetermined temperature when the switch is in the closed state; when the first battery voltage is less than or equal to the sixth predetermined voltage, controlling the first solenoid valve, the second solenoid valve and the air inflation pump to close and controlling an alarm to give an alarm.

[0015] Optionally, after adjusting the rotation speed of the blower and the opening and closing time of the second solenoid valve according to the first battery voltage and the first battery temperature, the method further includes: when the switch is in the closed state, obtaining the voltage and temperature of the fuel cell at the current moment to obtain a third battery voltage and a second battery temperature; when the third battery voltage is less than or equal to the first battery voltage, adjusting the rotation speed of the blower and the opening and closing time of the second solenoid valve according to the third battery voltage and the second battery temperature to adjust the temperature of the fuel cell when the switch is in the closed state to the predetermined temperature; when the third battery voltage is greater than the first battery voltage, alternately controlling the second solenoid valve in such a way that the opening time of the second solenoid valve is a first predetermined opening time and the closing time of the second solenoid valve is a sixth predetermined time period, and adjusting the rotation speed of the blower to adjust the temperature of the fuel cell when the switch is in the closed state to a first predetermined temperature.

[0016] According to another aspect of the embodiments of the present invention, there is also provided an emission control system for a fuel cell, the system includes: a fuel cell, a blower, a controller, an air inflation pump, a first solenoid valve, a second solenoid valve, a voltage inspection instrument, a temperature sensor and a switch, the controller is communicatively connected to the temperature sensor, the voltage inspection instrument, the first solenoid valve, the second solenoid valve, the air inflation pump and the blower respectively, a temperature sensor is installed inside the fuel cell, a voltage acquisition probe of the voltage inspection instrument is electrically connected to the fuel cell, an output end of the air inflation pump is communicated with an input end of the first solenoid valve, an output end of the first solenoid valve is communicated with an intake end of the fuel cell, an exhaust end of the fuel cell is communicated with an input end of the second solenoid valve, an output end of the second solenoid valve is used for communicating with an exhaust gas collection structure, an electric energy output end of the fuel cell is electrically connected to a first end of the switch, and a second end of the switch is used for being electrically connected to an electrical device, and the controller is configured to execute any one of the fuel cell emission control methods.

[0017] In the embodiments of the present invention, by adjusting the rotation speed of the blower and the opening and closing time of the second solenoid valve when the switch is in the closed state to adjust the temperature of the fuel cell when the switch is in the closed state to a predetermined temperature, the performance of the fuel cell can be optimized, and further the problem of how to avoid internal corrosion of the battery caused by the fuel cell being in a waterlogging fault for a long time is solved. Description of the Drawings

[0018] The specification drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0019] Figure 1 shows a flowchart of an emission control method for a fuel cell according to an embodiment of the present application;

[0020] Figure 2 shows a schematic diagram of an emission control device for a fuel cell according to an embodiment of the present application;

[0021] Figure 3 shows a schematic diagram of an emission control system for a fuel cell according to an embodiment of the present application;

[0022] Figure 4 shows a schematic connection diagram of a fuel cell and a voltage inspection instrument according to an embodiment of the present application;

[0023] Figure 5 shows a flowchart when the switch is in the off state in an emission control scheme for a fuel cell according to an embodiment of the present application;

[0024] Figure 6 shows a flowchart of steps related to the first battery voltage when the switch is in the closed state in an emission control scheme for a fuel cell according to an embodiment of the present application;

[0025] Figure 7 shows a flowchart of steps related to the first battery temperature when the switch is in the closed state in an emission control scheme for a fuel cell according to an embodiment of the present application.

[0026] Among them, the above-mentioned drawings include the following reference numerals:

[0027] 30, fuel cell; 31, battery cell; 41, fan; 411, air filter; 42, controller; 43, inflator pump; 44, first solenoid valve; 45, second solenoid valve; 46, voltage inspection instrument; 47, temperature sensor; 48, current sensor; 49, DC conversion circuit; 50, tail gas collection structure; 60, electrical equipment. Detailed implementation manners

[0028] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0031] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element can be directly on the other element, or there may also be intermediate elements. Moreover, in the description and claims, when an element is described as "connected" to another element, the element can be "directly connected" to the other element, or "connected" to the other element through a third element.

[0032] As described in the background art, when the battery is in a flooded failure for a long time, it will cause other side chemical reactions inside the battery and cause corrosion of the catalyst layer. If the corrosion impurities appear inside the exchange membrane, it may lead to battery failure. In order to solve the problem of how to avoid internal corrosion of the fuel cell caused by being in a flooded failure for a long time, in a typical implementation of this application, a method and system for emission control of a fuel cell are provided.

[0033] According to an embodiment of the present application, a method for emission control of a fuel cell is provided. This method is applied to an emission control system of a fuel cell. The system includes a fuel cell, a fan, a first solenoid valve, a second solenoid valve, and a switch. The output end of the first solenoid valve is communicated with the intake end of the fuel cell. The outlet end of the fuel cell is communicated with the input end of the second solenoid valve. The power output end of the fuel cell is electrically connected to the switch.

[0034] As Figure 1 shown, this method includes the following steps:

[0035] Step S101, when the switch is in a closed state, obtain the voltage and temperature of the fuel cell at the current moment to obtain a first battery voltage and a first battery temperature;

[0036] Step S102: Adjust the rotation speed of the blower and the opening and closing time of the second solenoid valve according to the above-mentioned first battery voltage and the above-mentioned first battery temperature, so as to adjust the temperature of the fuel cell to a predetermined temperature when the switch is in the closed state. Wherein, the state of the first solenoid valve remains open, and the opening and closing time of the second solenoid valve is used to represent the opening time and closing time of the second solenoid valve in each control cycle.

[0037] In an embodiment of the present application, the system further includes an air pump, the output end of the air pump is communicated with the input end of the first solenoid valve, and the method further includes: when the switch is in the off state, obtain the voltage of the fuel cell at the current moment to obtain a second battery voltage; according to the second battery voltage, adjust the opening and closing time of the second solenoid valve and the opening and closing of the air pump, so as to adjust the voltage of the fuel cell to reach the target range when the switch is in the off state. When the switch is in the off state, the voltage of the fuel cell is adjusted to reach the target range when the switch is in the off state, thereby improving the performance of the fuel cell.

[0038] In an embodiment of the present application, adjusting the opening and closing time of the second solenoid valve and the opening and closing of the air pump according to the second battery voltage includes: when the second battery voltage is less than a first predetermined voltage, or the second battery voltage is greater than a second predetermined voltage, control the second solenoid valve in such a way that the opening time of the second solenoid valve is a first predetermined time period, and control the air pump to open. After the air pump is opened, the air pump starts to fill hydrogen into the fuel cell; after the first predetermined time period, control the second solenoid valve and the air pump to close.

[0039] Specifically, for example, when the second battery voltage is less than 0.9V (i.e., the first predetermined voltage), or the second battery voltage is greater than 1V (i.e., the second predetermined voltage), control the second solenoid valve in such a way that the opening time of the second solenoid valve is 10s (i.e., the first predetermined time period), control the air pump to open, and control the second solenoid valve and the air pump to close after 10s.

[0040] In an embodiment of the present application, adjusting the opening and closing time of the second solenoid valve and the opening and closing of the air pump according to the second battery voltage includes: when the second battery voltage is less than a first predetermined voltage or the second battery voltage is greater than a second predetermined voltage, controlling the air pump to turn on, and alternately controlling the second solenoid valve in such a way that the cycle is a second predetermined time period, the opening time of the second solenoid valve is a third predetermined time period, and the closing time of the second solenoid valve is a fourth predetermined time period, where the second predetermined time period is less than the first predetermined time period, the third predetermined time period is less than the second predetermined time period, the fourth predetermined time period is greater than the third predetermined time period and less than the second predetermined time period; after the first predetermined time period has passed, controlling the air pump to turn off and controlling the second solenoid valve to remain closed.

[0041] Specifically, for example, when the second battery voltage is less than 0.9V (i.e., the first predetermined voltage) or the second battery voltage is greater than 1V (i.e., the second predetermined voltage), controlling the air pump to turn on, and alternately controlling the second solenoid valve in such a way that the cycle is 5s (i.e., the second predetermined time period), the opening time of the second solenoid valve is 1s (i.e., the third predetermined time period), and the closing time of the second solenoid valve is 4s (i.e., the fourth predetermined time period). After 10s, controlling the air pump to turn off and controlling the second solenoid valve to remain closed.

[0042] In an embodiment of the present application, adjusting the opening and closing time of the second solenoid valve and the opening and closing of the air pump according to the second battery voltage includes: when the second battery voltage is less than a first predetermined voltage or the second battery voltage is greater than a second predetermined voltage, controlling the air pump to turn on, and alternately controlling the second solenoid valve in such a way that the cycle is a fifth predetermined time period, the opening time of the second solenoid valve is a third predetermined time period, and the closing time of the second solenoid valve is a third predetermined time period; after the first predetermined time period has passed, controlling the air pump to turn off and controlling the second solenoid valve to remain closed; when the second battery voltage is less than a first predetermined voltage or the second battery voltage is greater than a second predetermined voltage, controlling the first solenoid valve, the second solenoid valve and the air pump to turn off and controlling the alarm to give an alarm.

[0043] Specifically, for example, when the above-mentioned second battery voltage is less than 0.9V (i.e., the first predetermined voltage), or when the above-mentioned second battery voltage is greater than 1V (i.e., the second predetermined voltage), control the above-mentioned inflation pump to turn on, and with a period of 2s (i.e., the fifth predetermined time period), the opening time of the above-mentioned second solenoid valve is 1s (i.e., the third predetermined time period), and the closing time of the above-mentioned second solenoid valve is 1s to alternately control the above-mentioned second solenoid valve. After 10s, control the above-mentioned inflation pump to turn off, and control the above-mentioned second solenoid valve to remain closed; when the above-mentioned second battery voltage is greater than or equal to 0.9V and the above-mentioned second battery voltage is less than or equal to 1V, control the above-mentioned first solenoid valve, the above-mentioned second solenoid valve and the above-mentioned inflation pump to turn off, and control the alarm to give an alarm.

[0044] Another specific embodiment is provided, which is not limited to the above control method. For example, when the second battery voltage is less than 0.9V (i.e., the first predetermined voltage) or the second battery voltage is greater than 1V (i.e., the second predetermined voltage) appears for the first time, control the above-mentioned second solenoid valve in such a way that the opening time of the above-mentioned second solenoid valve is 10s (i.e., the first predetermined time period), and control the above-mentioned inflation pump to turn on, and after 10s, control the above-mentioned second solenoid valve and the above-mentioned inflation pump to turn off; when the second battery voltage is less than 0.9V (i.e., the first predetermined voltage) or the second battery voltage is greater than 1V (i.e., the second predetermined voltage) appears for the second time, control the above-mentioned inflation pump to turn on, and with a period of 5s (i.e., the second predetermined time period), the opening time of the above-mentioned second solenoid valve is 1s (i.e., the third predetermined time period), and the closing time of the above-mentioned second solenoid valve is 4s (i.e., the fourth predetermined time period) to alternately control the above-mentioned second solenoid valve. After 10s, control the above-mentioned inflation pump to turn off, and control the above-mentioned second solenoid valve to remain closed; when the second battery voltage is less than 0.9V (i.e., the first predetermined voltage) or the second battery voltage is greater than 1V (i.e., the second predetermined voltage) appears for the third time, control the above-mentioned inflation pump to turn on, and with a period of 2s (i.e., the fifth predetermined time period), the opening time of the above-mentioned second solenoid valve is 1s (i.e., the third predetermined time period), and the closing time of the above-mentioned second solenoid valve is 1s to alternately control the above-mentioned second solenoid valve. After 10s, control the above-mentioned inflation pump to turn off, and control the above-mentioned second solenoid valve to remain closed; when the second battery voltage is less than 0.9V (i.e., the first predetermined voltage) or the second battery voltage is greater than 1V (i.e., the second predetermined voltage) appears for the fourth time, control the above-mentioned first solenoid valve, the above-mentioned second solenoid valve and the above-mentioned inflation pump to turn off, and control the alarm to give an alarm.

[0045] In an embodiment of the present application, before obtaining the voltage and temperature of the fuel cell at the current moment to obtain the first battery voltage and the first battery temperature when the above switch is in the closed state, the above method further includes: when the voltage of the fuel cell when the above switch is in the open state is greater than or equal to a first predetermined voltage and the voltage of the fuel cell when the above switch is in the open state is less than or equal to a second predetermined voltage, controlling the above switch to close.

[0046] Specifically, when the voltage of the fuel cell when the above switch is in the open state is greater than or equal to 0.9V and the voltage of the fuel cell when the above switch is in the open state is less than or equal to 1V, controlling the above switch to close.

[0047] In an embodiment of the present application, before adjusting the rotation speed of the above fan and the opening and closing time of the above second solenoid valve according to the above first battery voltage and the above first battery temperature, the above method further includes: obtaining the fuel cell current at the current moment; determining a first predetermined opening time of the above second solenoid valve according to the fuel cell current at the current moment; alternately controlling the above second solenoid valve in such a way that the opening time of the above second solenoid valve is the above first predetermined opening time and the closing time of the above second solenoid valve is a sixth predetermined time period, so that the voltage of the fuel cell when the above switch is in the closed state is maintained within a predetermined range.

[0048] In an embodiment of the present application, determining the first predetermined opening time of the above second solenoid valve according to the fuel cell current at the current moment includes: according to the first formula determining the above first predetermined opening time, where I out is the fuel cell current at the current moment, and T on is the above first predetermined opening time. Thus, the first predetermined opening time changes with the current, thereby improving the performance of the fuel cell.

[0049] In an embodiment of the present application, the system further includes an air pump. The output end of the air pump is communicated with the input end of the first solenoid valve. Adjusting the rotation speed of the blower and the opening and closing time of the second solenoid valve according to the first battery voltage and the first battery temperature includes: when the first battery voltage is greater than or equal to a third predetermined voltage, alternately controlling the second solenoid valve in such a way that the opening time of the second solenoid valve is a first predetermined opening time and the closing time of the second solenoid valve is a sixth predetermined time period, and adjusting the rotation speed of the blower to adjust the temperature of the fuel cell to a first predetermined temperature when the switch is in the closed state; when the first battery voltage is less than the third predetermined voltage, and the first battery voltage is greater than a fourth predetermined voltage, and the first predetermined opening time is greater than a time threshold, alternately controlling the second solenoid valve in such a way that the opening time of the second solenoid valve is a second predetermined opening time and the closing time of the second solenoid valve is a sixth predetermined time period, and adjusting the rotation speed of the blower to adjust the temperature of the fuel cell to a second predetermined temperature when the switch is in the closed state, where the second predetermined temperature is greater than the first predetermined temperature; when the first battery voltage is less than or equal to the fourth predetermined voltage, and the first battery voltage is greater than a fifth predetermined voltage, and the first predetermined opening time is greater than the time threshold, alternately controlling the second solenoid valve in such a way that the opening time of the second solenoid valve is a third predetermined opening time and the closing time of the second solenoid valve is a sixth predetermined time period, and adjusting the rotation speed of the blower to adjust the temperature of the fuel cell to a third predetermined temperature when the switch is in the closed state, where the third predetermined temperature is greater than the second predetermined temperature; when the first battery voltage is less than or equal to the fifth predetermined voltage, and the first battery voltage is greater than a sixth predetermined voltage, controlling the second solenoid valve to remain open and adjusting the rotation speed of the blower to adjust the temperature of the fuel cell to the third predetermined temperature when the switch is in the closed state; when the first battery voltage is less than or equal to the sixth predetermined voltage, controlling the first solenoid valve, the second solenoid valve and the air pump to close and controlling an alarm to give an alarm.

[0050] Specifically, when the above-mentioned first battery voltage is greater than or equal to 0.5V (i.e., the third predetermined voltage), the opening time of the above-mentioned second solenoid valve is taken as the first predetermined opening time, and the closing time of the above-mentioned second solenoid valve is 1s (i.e., the sixth predetermined time period) to alternately control the above-mentioned second solenoid valve, and adjust the rotation speed of the above-mentioned fan to adjust the temperature of the above-mentioned fuel cell to 65°C (i.e., the first predetermined temperature) when the above-mentioned switch is in the closed state; when the above-mentioned first battery voltage is less than 0.5V, and the above-mentioned first battery voltage is greater than 0.4V (i.e., the fourth predetermined voltage), and the above-mentioned first predetermined opening time is greater than 10s (i.e., the time threshold), the opening time of the above-mentioned second solenoid valve is taken as the second predetermined opening time, and the closing time of the above-mentioned second solenoid valve is 1s to alternately control the above-mentioned second solenoid valve, and adjust the rotation speed of the above-mentioned fan to adjust the temperature of the above-mentioned fuel cell to 69°C (i.e., the second predetermined temperature) when the above-mentioned switch is in the closed state; when the above-mentioned first battery voltage is less than or equal to 0.4V, and the above-mentioned first battery voltage is greater than 0.35V (i.e., the fifth predetermined voltage), and the above-mentioned first predetermined opening time is greater than the above-mentioned 10s, the opening time of the above-mentioned second solenoid valve is taken as the third predetermined opening time, and the closing time of the above-mentioned second solenoid valve is 1s to alternately control the above-mentioned second solenoid valve, and adjust the rotation speed of the above-mentioned fan to adjust the temperature of the above-mentioned fuel cell to 76°C (i.e., the third predetermined temperature) when the above-mentioned switch is in the closed state; when the above-mentioned first battery voltage is less than or equal to 0.35V, and the above-mentioned first battery voltage is greater than 0.3V (i.e., the sixth predetermined voltage), control the above-mentioned second solenoid valve to remain open, and adjust the rotation speed of the above-mentioned fan to adjust the temperature of the above-mentioned fuel cell to 76°C when the above-mentioned switch is in the closed state; when the above-mentioned first battery voltage is less than or equal to 0.3V, control the above-mentioned first solenoid valve, the above-mentioned second solenoid valve and the above-mentioned air pump to close, and control the alarm to give an alarm; where the second predetermined opening time is calculated using the second formula Calculate, T on1 is the second predetermined opening time, and the third predetermined opening time is calculated using the third formula Calculate, T on2 is the third predetermined opening time.

[0051] In an embodiment of the present application, after adjusting the rotation speed of the fan and the opening and closing time of the second solenoid valve according to the above-mentioned first battery voltage and the above-mentioned first battery temperature, the method further includes: when the switch is in the closed state, obtaining the voltage and temperature of the fuel cell at the current moment to obtain a third battery voltage and a second battery temperature; when the third battery voltage is less than or equal to the first battery voltage, adjusting the rotation speed of the fan and the opening and closing time of the second solenoid valve according to the third battery voltage and the second battery temperature to adjust the temperature of the fuel cell when the switch is in the closed state to the above-mentioned predetermined temperature; when the third battery voltage is greater than the first battery voltage, alternately controlling the second solenoid valve in such a way that the opening time of the second solenoid valve is a first predetermined opening time and the closing time of the second solenoid valve is a sixth predetermined time period, and adjusting the rotation speed of the fan to adjust the temperature of the fuel cell when the switch is in the closed state to a first predetermined temperature.

[0052] Specifically, for example, after 30 s, if the obtained third battery voltage is greater than the first battery voltage, the second solenoid valve can continue to be alternately controlled in such a way that the opening time is the first predetermined opening time and the closing time is 1 s, indicating that the performance of the fuel cell has been improved; otherwise, the above-mentioned method continues to be used for regulation until the performance of the fuel cell is improved.

[0053] In the above steps, by adjusting the rotation speed of the fan and the opening and closing time of the second solenoid valve when the switch is in the closed state, the temperature of the fuel cell when the switch is in the closed state is adjusted to the predetermined temperature, thereby optimizing the performance of the fuel cell, and further solving the problem of how to avoid internal corrosion of the battery caused by the fuel cell being in a flooding fault for a long time.

[0054] The voltage of a single cell is detected by a fuel cell system voltage inspection instrument and found to be decreasing with fluctuations, indicating that the fuel cell is flooded. The degree of flooding and the location of flooding in the stack are determined based on the decrease and fluctuations in the single cell voltage, which serves as the main basis for the operation of the fuel cell system. According to the voltage values of the fuel single cells during the operation of the stack, the flooding faults are divided into several levels, and corresponding intelligent pulse emission control strategies are applied to each level to promptly remove the accumulated water inside the stack and keep the stack operating normally. During the operation of the system, the fault degree of the flooding phenomenon is judged according to the magnitude of the single cell voltage. While applying the intelligent pulse emission control strategy, the temperature inside the stack is also monitored. Using the temperature characteristics of the stack during operation, the system controls the fan speed to raise the temperature of the fuel cell stack, increase the saturated vapor pressure, and reduce the generation of liquid water. Since the flooding fault only affects the single cell with flooding in the fuel cell, the overall voltage drop of the fuel cell is not obvious, but the voltage of the flooded single cell will drop significantly. By using this characteristic to collect the voltage of each single cell in the fuel cell, it is possible to quickly and accurately identify a single cell or several single cells that are flooded. Collecting voltage is the simplest and most convenient method. The fan controls the temperature inside the fuel cell stack. When flooding occurs, the fan speed is reduced according to the actual situation to increase the temperature inside the stack, raise the saturated vapor pressure, reduce the generation of liquid water, facilitate the exhaust gas emission, and relieve the flooding.

[0055] 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 the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0056] The embodiment of the present application also provides an emission control device for a fuel cell. It should be noted that the emission control device for a fuel cell in the embodiment of the present application can be used to execute the emission control method for a fuel cell provided in the embodiment of the present application. The following introduces the emission control device for a fuel cell provided in the embodiment of the present application.

[0057] As Figure 2As shown, the device includes a first acquisition unit 10 and a first adjustment unit 20; the first acquisition unit 10 is configured to acquire the voltage and temperature of the fuel cell at the current moment when the above switch is in the closed state, so as to obtain a first battery voltage and a first battery temperature; the first adjustment unit 20 is configured to adjust the rotation speed of the above fan and the opening and closing time of the above second solenoid valve according to the above first battery voltage and the above first battery temperature, so as to adjust the temperature of the above fuel cell to a predetermined temperature when the above switch is in the closed state, wherein the state of the above first solenoid valve remains open, and the opening and closing time of the above second solenoid valve is used to represent the opening time and closing time of the above second solenoid valve in each control cycle.

[0058] In the above device, by adjusting the rotation speed of the above fan and the opening and closing time of the above second solenoid valve when the above switch is in the closed state, the temperature of the above fuel cell is adjusted to a predetermined temperature when the above switch is in the closed state, so as to optimize the performance of the fuel cell, and further solve the problem of how to avoid internal corrosion of the battery caused by the fuel cell being in a flooding failure for a long time.

[0059] In an embodiment of the present application, the device further includes a second acquisition unit and a second adjustment unit. The second acquisition unit is configured to acquire the voltage of the fuel cell at the current moment when the above switch is in the open state, so as to obtain a second battery voltage; the second adjustment unit is configured to adjust the opening and closing time of the above second solenoid valve and the opening and closing of the above air pump according to the above second battery voltage, so as to adjust the voltage of the above fuel cell to be within a target range when the above switch is in the open state.

[0060] In an embodiment of the present application, the second adjustment unit includes a first adjustment module and a second adjustment module. The first adjustment module is configured to control the above second solenoid valve in such a way that the opening time of the above second solenoid valve is a first predetermined time period, and control the above air pump to open when the above second battery voltage is less than a first predetermined voltage or the above second battery voltage is greater than a second predetermined voltage. After the above air pump is opened, the above air pump starts to fill hydrogen into the above fuel cell; the second adjustment module is configured to control the above second solenoid valve and the above air pump to close after a first predetermined time period.

[0061] In an embodiment of the present application, the second adjustment unit includes a third adjustment module and a fourth adjustment module. The third adjustment module is configured to control the inflation pump to turn on when the second battery voltage is less than the first predetermined voltage or greater than the second predetermined voltage, and alternately control the second solenoid valve in such a manner that the cycle is the second predetermined time period, the opening time of the second solenoid valve is the third predetermined time period, and the closing time of the second solenoid valve is the fourth predetermined time period. Wherein, the second predetermined time period is less than the first predetermined time period, the third predetermined time period is less than the second predetermined time period, the fourth predetermined time period is greater than the third predetermined time period and less than the second predetermined time period; the fourth adjustment module is configured to control the inflation pump to turn off and control the second solenoid valve to remain closed after the first predetermined time period has elapsed.

[0062] In an embodiment of the present application, the second adjustment unit includes a fifth adjustment module, a sixth adjustment module and an alarm module. The fifth adjustment module is configured to control the inflation pump to turn on when the second battery voltage is less than the first predetermined voltage or greater than the second predetermined voltage, and alternately control the second solenoid valve in such a manner that the cycle is the fifth predetermined time period, the opening time of the second solenoid valve is the third predetermined time period, and the closing time of the second solenoid valve is the third predetermined time period; the fifth adjustment module is configured to control the inflation pump to turn off and control the second solenoid valve to remain closed after the first predetermined time period has elapsed; the alarm module is configured to control the first solenoid valve, the second solenoid valve and the inflation pump to turn off and control the alarm to give an alarm when the second battery voltage is less than the first predetermined voltage or greater than the second predetermined voltage.

[0063] In an embodiment of the present application, the device further includes a control unit. When the switch is in the closed state, before obtaining the voltage and temperature of the fuel cell at the current moment to obtain the first battery voltage and the first battery temperature, the control unit is configured to control the switch to close when the voltage of the fuel cell when the switch is in the open state is greater than or equal to the first predetermined voltage and less than or equal to the second predetermined voltage.

[0064] In an embodiment of the present application, the device further includes a third acquisition unit, a determination unit, and a third adjustment unit. Before adjusting the rotation speed of the fan and the opening and closing time of the second solenoid valve according to the above-mentioned first battery voltage and the above-mentioned first battery temperature, the third acquisition unit is used to acquire the fuel cell current at the current moment; the determination unit is used to determine the first predetermined opening time of the second solenoid valve according to the fuel cell current at the current moment; the third adjustment unit is used to alternately control the second solenoid valve in such a way that the opening time of the second solenoid valve is the first predetermined opening time and the closing time of the second solenoid valve is the sixth predetermined time period, so as to keep the voltage of the fuel cell within a predetermined range when the switch is in the closed state.

[0065] In an embodiment of the present application, the determination unit includes a determination module, and the determination module is used to determine according to the first formula the first predetermined opening time, where I out is the fuel cell current at the current moment, and T on is the first predetermined opening time.

[0066] In an embodiment of the present application, the first adjustment unit includes a seventh adjustment module, an eighth adjustment module, a ninth adjustment module, a tenth adjustment module, and an eleventh adjustment module. The seventh adjustment module is configured to, when the first battery voltage is greater than or equal to the third predetermined voltage, alternately control the second solenoid valve in such a way that the opening time of the second solenoid valve is the first predetermined opening time and the closing time of the second solenoid valve is the sixth predetermined time period, and adjust the rotational speed of the blower to adjust the temperature of the fuel cell to the first predetermined temperature when the switch is in the closed state; the eighth adjustment module is configured to, when the first battery voltage is less than the third predetermined voltage, the first battery voltage is greater than the fourth predetermined voltage, and the first predetermined opening time is greater than the time threshold, alternately control the second solenoid valve in such a way that the opening time of the second solenoid valve is the second predetermined opening time and the closing time of the second solenoid valve is the sixth predetermined time period, and adjust the rotational speed of the blower to adjust the temperature of the fuel cell to the second predetermined temperature when the switch is in the closed state, where the second predetermined temperature is greater than the first predetermined temperature; the ninth adjustment module is configured to, when the first battery voltage is less than or equal to the fourth predetermined voltage, the first battery voltage is greater than the fifth predetermined voltage, and the first predetermined opening time is greater than the time threshold, alternately control the second solenoid valve in such a way that the opening time of the second solenoid valve is the third predetermined opening time and the closing time of the second solenoid valve is the sixth predetermined time period, and adjust the rotational speed of the blower to adjust the temperature of the fuel cell to the third predetermined temperature when the switch is in the closed state, where the third predetermined temperature is greater than the second predetermined temperature; the tenth adjustment module is configured to, when the first battery voltage is less than or equal to the fifth predetermined voltage and the first battery voltage is greater than the sixth predetermined voltage, control the second solenoid valve to remain open and adjust the rotational speed of the blower to adjust the temperature of the fuel cell to the third predetermined temperature when the switch is in the closed state; the tenth adjustment module is configured to, when the first battery voltage is less than or equal to the sixth predetermined voltage, control the first solenoid valve, the second solenoid valve, and the air pump to close and control the alarm to give an alarm.

[0067] In an embodiment of the present application, the device further includes a fourth acquisition unit, a fourth adjustment unit, and a fifth adjustment unit. After adjusting the rotation speed of the fan and the opening and closing time of the second solenoid valve according to the above-mentioned first battery voltage and the above-mentioned first battery temperature, the fourth acquisition unit is configured to acquire the voltage and temperature of the fuel cell at the current moment when the switch is in the closed state, so as to obtain a third battery voltage and a second battery temperature; the fourth adjustment unit is configured to, when the third battery voltage is less than or equal to the first battery voltage, adjust the rotation speed of the fan and the opening and closing time of the second solenoid valve according to the third battery voltage and the second battery temperature, so as to adjust the temperature of the fuel cell to the predetermined temperature when the switch is in the closed state; the fifth adjustment unit is configured to, when the third battery voltage is greater than the first battery voltage, alternately control the second solenoid valve in such a way that the opening time of the second solenoid valve is a first predetermined opening time and the closing time of the second solenoid valve is a sixth predetermined time period, and adjust the rotation speed of the fan, so as to adjust the temperature of the fuel cell to a first predetermined temperature when the switch is in the closed state.

[0068] The emission control device of the above-mentioned fuel cell includes a processor and a memory. The above-mentioned first acquisition unit, the first adjustment unit, etc. are all stored in the memory as program units, and the corresponding functions are realized by the processor executing the above-mentioned program units stored in the memory.

[0069] The processor includes a kernel, and the kernel is used to retrieve the corresponding program units from the memory. One or more kernels can be set, and by adjusting the kernel parameters, the problem of how to avoid internal corrosion of the battery caused by the fuel cell being in a flooded failure for a long time can be solved.

[0070] The memory may include non-permanent memory in a computer-readable medium, forms such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM), and the memory includes at least one storage chip.

[0071] An embodiment of the present invention provides a computer-readable storage medium, on which a program is stored, and when the program is executed by a processor, the above-mentioned emission control method of the fuel cell is realized.

[0072] An embodiment of the present invention provides a processor, and the above-mentioned processor is used to run a program, wherein when the program runs, the above-mentioned emission control method of the fuel cell is executed.

[0073] An embodiment of the present invention provides a device, which includes a processor, a memory, and a program stored on the memory and executable on the processor. When the processor executes the program, it implements at least the following steps: when the above switch is in a closed state, obtain the voltage and temperature of the fuel cell at the current moment to obtain a first battery voltage and a first battery temperature; according to the above first battery voltage and the above first battery temperature, adjust the rotation speed of the above fan and the opening and closing time of the above second solenoid valve to adjust the temperature of the above fuel cell to a predetermined temperature when the above switch is in a closed state, wherein the state of the above first solenoid valve remains open, and the opening and closing time of the above second solenoid valve is used to represent the opening time and closing time of the above second solenoid valve in each control period. The device in this article can be a server, a PC, a PAD, a mobile phone, etc.

[0074] The present application also provides a computer program product, which, when executed on a data processing device, is adapted to execute a program initialized with at least the following method steps: when the above switch is in a closed state, obtain the voltage and temperature of the fuel cell at the current moment to obtain a first battery voltage and a first battery temperature; according to the above first battery voltage and the above first battery temperature, adjust the rotation speed of the above fan and the opening and closing time of the above second solenoid valve to adjust the temperature of the above fuel cell to a predetermined temperature when the above switch is in a closed state, wherein the state of the above first solenoid valve remains open, and the opening and closing time of the above second solenoid valve is used to represent the opening time and closing time of the above second solenoid valve in each control period.

[0075] The present application also provides an emission control system for a fuel cell, as Figure 3 shown. The system includes a fuel cell 30, a fan 41, a controller 42, an air pump 43, a first solenoid valve 44, a second solenoid valve 45, a voltage inspection instrument 46, a temperature sensor 47, and a switch SW. The above controller 42 is communicatively connected to the above temperature sensor 47, the above voltage inspection instrument 46, the above first solenoid valve 44, the above second solenoid valve 45, the above air pump 43, and the above fan 41 respectively. The temperature sensor 47 is installed inside the above fuel cell 30. The voltage acquisition probe of the voltage inspection instrument 46 is electrically connected to the above fuel cell 30. The output end of the above air pump 43 is communicated with the input end of the above first solenoid valve 44. The output end of the above first solenoid valve 44 is communicated with the intake end of the above fuel cell 30. The exhaust end of the above fuel cell 30 is communicated with the input end of the above second solenoid valve 45. The output end of the above second solenoid valve 45 is used to be communicated with an exhaust gas collection structure 50 (the exhaust gas collection structure 50 can be a hydrogen cylinder). The power output end of the above fuel cell 30 is electrically connected to the first end of the above switch SW. The second end of the above switch SW is used to be electrically connected to an electrical device 60. The controller is used to execute any one of the above fuel cell emission control methods.

[0076] By adjusting the rotational speed of the above-mentioned fan and the opening and closing time of the above-mentioned second solenoid valve when the above-mentioned switch is in the closed state, the temperature of the above-mentioned fuel cell when the above-mentioned switch is in the closed state is adjusted to a predetermined temperature, so as to optimize the performance of the fuel cell, and further solve the problem of how to avoid internal corrosion of the battery caused by the fuel cell being in a flooded fault for a long time.

[0077] As Figure 3 shown, the system further includes a current sensor 48 and an air filter 411. The air filter 411 is installed between the fan 41 and the fuel cell 30 for purifying the air blown by the fan 41. The current sensor 48 is electrically connected between the switch SW and the power output terminal of the fuel cell 30, and the current sensor 48 is communicatively connected to the controller 42. A DC conversion circuit 49 is electrically connected between the electrical device 60 and the switch SW for converting the voltage output by the fuel cell 30 into a voltage suitable for use by the electrical device 60.

[0078] As Figure 4 shown, the fuel cell 30 includes a plurality of battery cells 31, and each battery cell 31 is electrically connected to a voltage inspection instrument 46, enabling the voltage inspection instrument 46 to collect the voltages of the respective battery cells 31 in the fuel cell 30, so as to determine which one or which battery cells 31 have failed.

[0079] In order to reach a temperature point close to the optimal operating temperature of 65 °C of the fuel cell (too low a temperature affects the performance of the membrane electrode, and too high a temperature reduces the conductivity efficiency of the membrane electrode, thereby affecting the performance and service life of the battery, and even causing safety accidents), it is necessary to monitor the internal temperature of the fuel cell stack. Therefore, the fan controls its rotational speed according to the data of the temperature sensor, keeps the optimal operating temperature of the fuel cell stack at about 65 °C, blows out the heat generated during the power generation process of the fuel cell from the stack, and discharges the water generated by the reaction of hydrogen and oxygen out of the stack. For the working efficiency of the stack, the stack temperature should not be too high or too low.

[0080] In order for those skilled in the art to more clearly understand the technical solution of the present application, the following will illustrate the technical solution and technical effects of the present application with specific embodiments.

[0081] Embodiment

[0082] The present application also provides an emission control solution for a fuel cell. This solution is applied to an emission control system of a fuel cell. The system includes a fuel cell, a fan, a first solenoid valve, a second solenoid valve, and a switch. The output end of the above-mentioned first solenoid valve is communicated with the intake end of the above-mentioned fuel cell, the outlet end of the above-mentioned fuel cell is communicated with the input end of the above-mentioned second solenoid valve, and the power output end of the above-mentioned fuel cell is electrically connected to the above-mentioned switch. AsFigure 5 , Figure 6 and Figure 7 As shown in and

[0083] , this solution includes the following steps:

[0083] Step 1: When the above switch is in the off state, obtain the voltage of the fuel cell at the current moment to get the second battery voltage.

[0084] Step 2: When the second battery voltage is less than 0.9V (i.e., the first predetermined voltage) for the first time, or when the second battery voltage is greater than 1V (i.e., the second predetermined voltage), control the above second solenoid valve in such a way that the opening time of the second solenoid valve is 10s (i.e., the first predetermined time period), and control the above inflation pump to start. After 10s, control the second solenoid valve and the inflation pump to close. When the second battery voltage is less than 0.9V (i.e., the first predetermined voltage) or the second battery voltage is greater than 1V (i.e., the second predetermined voltage) for the second time, control the inflation pump to start, and alternately control the second solenoid valve with a cycle of 5s (i.e., the second predetermined time period), the opening time of the second solenoid valve is 1s (i.e., the third predetermined time period), and the closing time of the second solenoid valve is 4s (i.e., the fourth predetermined time period). After 10s, control the inflation pump to close and control the second solenoid valve to remain closed. When the second battery voltage is less than 0.9V (i.e., the first predetermined voltage) or the second battery voltage is greater than 1V (i.e., the second predetermined voltage) for the third time, control the inflation pump to start, and alternately control the second solenoid valve with a cycle of 2s (i.e., the fifth predetermined time period), the opening time of the second solenoid valve is 1s (i.e., the third predetermined time period), and the closing time of the second solenoid valve is 1s. After 10s, control the inflation pump to close and control the second solenoid valve to remain closed. When the second battery voltage is less than 0.9V (i.e., the first predetermined voltage) or the second battery voltage is greater than 1V (i.e., the second predetermined voltage) for the fourth time, control the first solenoid valve, the second solenoid valve, and the inflation pump to close, and control the alarm to give an alarm, and then end.

[0085] Step 3: When the voltage of the fuel cell when the switch is in the off state is greater than or equal to 0.9V and less than or equal to 1V, control the switch to close; obtain the fuel cell current at the current moment; determine the first predetermined opening time of the second solenoid valve according to the fuel cell current at the current moment; alternately control the second solenoid valve in such a way that the opening time of the second solenoid valve is the first predetermined opening time and the closing time of the second solenoid valve is the sixth predetermined time period, so that the voltage of the fuel cell when the switch is in the closed state is maintained within a predetermined range; according to the first formula determine the first predetermined opening time, where I out is the fuel cell current at the current moment, and T on is the first predetermined opening time;

[0086] Step 4: Obtain the voltage and temperature of the fuel cell at the current moment to obtain the first battery voltage and the first battery temperature;

[0087] Step 5: When the above first battery voltage is greater than or equal to 0.5V (i.e., the third predetermined voltage), alternately control the above second solenoid valve in such a way that the opening time of the above second solenoid valve is the first predetermined opening time and the closing time of the above second solenoid valve is 1s (i.e., the sixth predetermined time period), and adjust the rotational speed of the above blower to adjust the temperature of the above fuel cell to 65°C (i.e., the first predetermined temperature) when the above switch is in the closed state, and then proceed to Step 6; when the above first battery voltage is less than 0.5V, and the above first battery voltage is greater than 0.4V (i.e., the fourth predetermined voltage), and the above first predetermined opening time is greater than 10s (i.e., the time threshold), alternately control the above second solenoid valve in such a way that the opening time of the above second solenoid valve is the second predetermined opening time and the closing time of the above second solenoid valve is 1s, and adjust the rotational speed of the above blower to adjust the temperature of the above fuel cell to 69°C (i.e., the second predetermined temperature) when the above switch is in the closed state, and then proceed to Step 6; when the above first battery voltage is less than or equal to 0.4V, and the above first battery voltage is greater than 0.35V (i.e., the fifth predetermined voltage), and the above first predetermined opening time is greater than the above 10s, alternately control the above second solenoid valve in such a way that the opening time of the above second solenoid valve is the third predetermined opening time and the closing time of the above second solenoid valve is 1s, and adjust the rotational speed of the above blower to adjust the temperature of the above fuel cell to 76°C (i.e., the third predetermined temperature) when the above switch is in the closed state, and then proceed to Step 6; when the above first battery voltage is less than or equal to 0.35V, and the above first battery voltage is greater than 0.3V (i.e., the sixth predetermined voltage), control the above second solenoid valve to remain open, and adjust the rotational speed of the above blower to adjust the temperature of the above fuel cell to 76°C when the above switch is in the closed state, and then proceed to Step 6; when the above first battery voltage is less than or equal to 0.3V, control the above first solenoid valve, the above second solenoid valve, and the above air pump to close, and control the alarm to give an alarm, and then end; where the second predetermined opening time is calculated using the second formula Calculate, T on1 is the second predetermined opening time, and the third predetermined opening time is calculated using the third formula Calculate, T on2 is the third predetermined opening time;

[0088] Step 6: After 30 s, obtain the voltage and temperature of the fuel cell at the current moment to get the third cell voltage and the second cell temperature; in the case that the third cell voltage is less than or equal to the first cell voltage, perform Step 5 (the difference from Step 5 is that the third cell voltage is used to compare with the predetermined voltage instead of using the first cell voltage and the predetermined voltage for comparison); in the case that the third cell voltage is greater than the first cell voltage, alternately control the second solenoid valve in such a way that the opening time of the second solenoid valve is the first predetermined opening time and the closing time of the second solenoid valve is the sixth predetermined time period, and adjust the rotational speed of the blower.

[0089] By adjusting the rotational speed of the blower and the opening and closing time of the second solenoid valve when the switch is in the closed state, the temperature of the fuel cell when the switch is in the closed state is adjusted to the predetermined temperature, so as to optimize the performance of the fuel cell, and further solve the problem of how to avoid internal corrosion of the battery caused by the fuel cell being in a waterlogging fault for a long time.

[0090] When the fuel cell system voltage inspection instrument detects that the voltage of a single cell drops and fluctuates, it is judged that the fuel cell is waterlogged, and the degree of waterlogging and the position where the stack is waterlogged are judged according to the drop and fluctuation of the single cell voltage, which is used as the main basis for the operation of the fuel cell system; according to the voltage value of the fuel single cell during the operation of the stack, the waterlogging fault is divided into several levels, and corresponding intelligent pulse emission control strategies are processed for these levels respectively to drain the accumulated water inside the stack in time and make the stack work normally. During the operation of the system, the fault degree of the waterlogging phenomenon is judged according to the size of the single cell voltage. While using the intelligent pulse emission control strategy for processing, the temperature inside the stack is also monitored, and using the temperature characteristics of the stack operation, the system controls the rotational speed of the blower to increase the temperature of the fuel cell stack, increase the saturated vapor pressure, and reduce the generation of liquid water. Since the waterlogging fault only affects the single cell with waterlogging in the fuel cell, the overall voltage drop of the fuel cell is not obvious, but the voltage of the single cell with waterlogging will drop significantly. Using this characteristic, the voltage of each single cell in the fuel cell is collected, and it is possible to quickly and accurately identify a single cell or several single cells with waterlogging. Collecting voltage is the simplest and most convenient way; the blower controls the temperature inside the fuel cell stack. When waterlogging occurs, the rotational speed of the blower is reduced according to the actual situation to increase the temperature inside the stack, increase the saturated vapor pressure, reduce the generation of liquid water, facilitate the exhaust of tail gas, and relieve waterlogging.

[0091] In the above embodiments of the present invention, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0092] In several embodiments provided by the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the above-mentioned division of units can be a logical function division. In actual implementation, there can be other division methods. 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 displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of units or modules can be in an electrical or other form.

[0093] The units described above as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0094] In addition, each functional unit in various embodiments of the present invention can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0095] If the above-mentioned 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 such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the above-mentioned methods in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), mobile hard disks, magnetic disks, or optical discs that can store program codes.

[0096] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0097] 1), The emission control method of the fuel cell of the present application adjusts the rotational speed of the above-mentioned fan and the opening and closing time of the above-mentioned second solenoid valve when the above-mentioned switch is in the closed state, so as to adjust the temperature of the above-mentioned fuel cell when the above-mentioned switch is in the closed state to a predetermined temperature, thereby optimizing the performance of the fuel cell, and further solving the problem of how to avoid internal corrosion of the battery caused by the fuel cell being in a waterlogging fault for a long time.

[0098] 2), The emission control system of the fuel cell of the present application adjusts the rotational speed of the above-mentioned fan and the opening and closing time of the above-mentioned second solenoid valve when the above-mentioned switch is in the closed state, so as to adjust the temperature of the above-mentioned fuel cell when the above-mentioned switch is in the closed state to a predetermined temperature, thereby optimizing the performance of the fuel cell, and further solving the problem of how to avoid internal corrosion of the battery caused by the fuel cell being in a waterlogging fault for a long time.

[0099] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for controlling emissions of a fuel cell, characterized in that, An emission control system applied to a fuel cell, the system includes a fuel cell, a fan, a first solenoid valve, a second solenoid valve and a switch. The output end of the first solenoid valve is communicated with the intake end of the fuel cell, the exhaust end of the fuel cell is communicated with the input end of the second solenoid valve, and the electric energy output end of the fuel cell is electrically connected to the switch. The method includes: When the switch is in the closed state, obtain the voltage and temperature of the fuel cell at the current moment to obtain the first battery voltage and the first battery temperature; According to the first battery voltage and the first battery temperature, adjust the rotation speed of the fan and the opening and closing time of the second solenoid valve to adjust the temperature of the fuel cell to a predetermined temperature when the switch is in the closed state. Wherein, the state of the first solenoid valve remains open, and the opening and closing time of the second solenoid valve is used to represent the opening time and closing time of the second solenoid valve in each control cycle; The system further includes an air pump, and the output end of the air pump is communicated with the input end of the first solenoid valve. The method further includes: When the switch is in the open state, obtain the voltage of the fuel cell at the current moment to obtain the second battery voltage; According to the second battery voltage, adjust the opening and closing time of the second solenoid valve and the opening and closing of the air pump to adjust the voltage of the fuel cell to reach the target range when the switch is in the open state; According to the second battery voltage, adjusting the opening and closing time of the second solenoid valve and the opening and closing of the air pump includes: When the second battery voltage is less than the first predetermined voltage or the second battery voltage is greater than the second predetermined voltage, control the air pump to open, and alternately control the second solenoid valve in a manner that the cycle is the second predetermined time period, the opening time of the second solenoid valve is the third predetermined time period, and the closing time of the second solenoid valve is the fourth predetermined time period. Wherein, the second predetermined time period is less than the first predetermined time period, the third predetermined time period is less than the second predetermined time period, the fourth predetermined time period is greater than the third predetermined time period and less than the second predetermined time period; After the first predetermined time period has passed, control the air pump to close and control the second solenoid valve to remain closed.

2. The method according to claim 1, characterized in that, According to the second battery voltage, adjusting the opening and closing time of the second solenoid valve and the opening and closing of the air pump includes: When the second battery voltage is less than the first predetermined voltage or the second battery voltage is greater than the second predetermined voltage, control the second solenoid valve in a manner that the opening time of the second solenoid valve is the first predetermined time period, and control the air pump to open. After the air pump is opened, the air pump starts to fill hydrogen into the fuel cell; After the first predetermined time period has passed, control the second solenoid valve and the air pump to close.

3. The method according to claim 1, characterized in that, According to the second battery voltage, adjusting the opening and closing time of the second solenoid valve and the opening and closing of the air pump includes: When the second battery voltage is less than the first predetermined voltage or the second battery voltage is greater than the second predetermined voltage, control the inflation pump to turn on, and alternately control the second solenoid valve in such a way that the cycle is the fifth predetermined time period, the opening time of the second solenoid valve is the third predetermined time period, and the closing time of the second solenoid valve is the third predetermined time period; After the first predetermined time period has elapsed, control the inflation pump to turn off and control the second solenoid valve to remain closed; When the second battery voltage is less than the first predetermined voltage or the second battery voltage is greater than the second predetermined voltage, control the first solenoid valve, the second solenoid valve, and the inflation pump to turn off, and control the alarm to give an alarm.

4. The method according to claim 1, wherein Before obtaining the voltage and temperature of the fuel cell at the current moment to get the first battery voltage and the first battery temperature when the switch is in the closed state, the method further includes: When the voltage of the fuel cell when the switch is in the open state is greater than or equal to the first predetermined voltage and the voltage of the fuel cell when the switch is in the open state is less than or equal to the second predetermined voltage, control the switch to close.

5. The method according to claim 1, characterized in that, Before adjusting the rotation speed of the blower and the opening and closing time of the second solenoid valve according to the first battery voltage and the first battery temperature, the method further includes: Obtain the fuel cell current at the current moment; Determine the first predetermined opening time of the second solenoid valve according to the fuel cell current at the current moment; Alternately control the second solenoid valve in such a way that the opening time of the second solenoid valve is the first predetermined opening time and the closing time of the second solenoid valve is the sixth predetermined time period, so that the voltage of the fuel cell when the switch is in the closed state is maintained within a predetermined range.

6. The method according to claim 5, characterized in that, Determining the first predetermined opening time of the second solenoid valve according to the fuel cell current at the current moment includes: According to the first formula to determine the first predetermined opening time, where I out is the fuel cell current at the current moment, and T on is the first predetermined opening time.

7. The method according to claim 1, characterized in that, The system further includes an inflation pump, the output end of the inflation pump is communicated with the input end of the first solenoid valve, and adjusting the rotation speed of the blower and the opening and closing time of the second solenoid valve according to the first battery voltage and the first battery temperature includes: When the first battery voltage is greater than or equal to the third predetermined voltage, alternately control the second solenoid valve in such a way that the opening time of the second solenoid valve is the first predetermined opening time and the closing time of the second solenoid valve is the sixth predetermined time period, and adjust the rotation speed of the blower to adjust the temperature of the fuel cell when the switch is in the closed state to the first predetermined temperature; When the first battery voltage is less than the third predetermined voltage, greater than the fourth predetermined voltage, and the first predetermined opening time is greater than the time threshold, the second solenoid valve is alternately controlled with the opening time of the second solenoid valve being the second predetermined opening time and the closing time of the second solenoid valve being the sixth predetermined time period, and the rotational speed of the blower is adjusted to adjust the temperature of the fuel cell to the second predetermined temperature when the switch is in the closed state, where the second predetermined temperature is greater than the first predetermined temperature; When the first battery voltage is less than or equal to the fourth predetermined voltage, greater than the fifth predetermined voltage, and the first predetermined opening time is greater than the time threshold, the second solenoid valve is alternately controlled with the opening time of the second solenoid valve being the third predetermined opening time and the closing time of the second solenoid valve being the sixth predetermined time period, and the rotational speed of the blower is adjusted to adjust the temperature of the fuel cell to the third predetermined temperature when the switch is in the closed state, where the third predetermined temperature is greater than the second predetermined temperature; When the first battery voltage is less than or equal to the fifth predetermined voltage and greater than the sixth predetermined voltage, the second solenoid valve is controlled to remain open, and the rotational speed of the blower is adjusted to adjust the temperature of the fuel cell to the third predetermined temperature when the switch is in the closed state; When the first battery voltage is less than or equal to the sixth predetermined voltage, the first solenoid valve, the second solenoid valve, and the air pump are controlled to close, and the alarm is controlled to give an alarm.

8. The method according to any one of claims 1 to 7, characterized in that After adjusting the rotational speed of the blower and the opening and closing time of the second solenoid valve according to the first battery voltage and the first battery temperature, the method further includes: When the switch is in the closed state, the voltage and temperature of the fuel cell at the current moment are acquired to obtain the third battery voltage and the second battery temperature; When the third battery voltage is less than or equal to the first battery voltage, the rotational speed of the blower and the opening and closing time of the second solenoid valve are adjusted according to the third battery voltage and the second battery temperature to adjust the temperature of the fuel cell to the predetermined temperature when the switch is in the closed state; When the third battery voltage is greater than the first battery voltage, the second solenoid valve is alternately controlled with the opening time of the second solenoid valve being the first predetermined opening time and the closing time of the second solenoid valve being the sixth predetermined time period, and the rotational speed of the blower is adjusted to adjust the temperature of the fuel cell to the first predetermined temperature when the switch is in the closed state.

9. An emission control system for a fuel cell, characterized in that, The system includes: a fuel cell, a fan, a controller, an air pump, a first solenoid valve, a second solenoid valve, a voltage inspection instrument, a temperature sensor, and a switch. The controller is communicatively connected to the temperature sensor, the voltage inspection instrument, the first solenoid valve, the second solenoid valve, the air pump, and the fan respectively. A temperature sensor is installed inside the fuel cell. The voltage acquisition probe of the voltage inspection instrument is electrically connected to the fuel cell. The output end of the air pump is communicated with the input end of the first solenoid valve. The output end of the first solenoid valve is communicated with the intake end of the fuel cell. The exhaust end of the fuel cell is communicated with the input end of the second solenoid valve. The output end of the second solenoid valve is used to be communicated with an exhaust gas collection structure. The electric energy output end of the fuel cell is electrically connected to the first end of the switch. The second end of the switch is used to be electrically connected to an electrical device. The controller is used to execute the fuel cell emission control method according to any one of claims 1 to 8.

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