Anode system purging control method, device, equipment and medium

Abstract

The invention discloses an anode system purging control method, device and equipment and a medium, and is applied to the technical field of fuel cells, and the method comprises the following steps: in a first purging stage, controlling a hydrogen circulating pump to operate according to a first target rotating speed and controlling a flow control valve to operate according to a target opening degree; in the second purging stage, the hydrogen circulating pump is controlled to operate according to the second target rotating speed, and the flow control valve is controlled to operate in a pulsating mode according to different opening degrees of the first opening degree range; and in the third purging stage, the hydrogen circulating pump is controlled to be closed, and the flow control valve is controlled to perform pulsating operation according to different opening degrees in a second opening degree range, so that the anode runner is purged through the first purging stage, the membrane electrode is purged through the second purging stage, and wet hydrogen discharged in the third purging stage is replaced with dry hydrogen. According to the invention, different positions of the anode system can be purged by stages, the problem of non-uniform water content distribution among single cells is effectively solved, and the problems of low monomer voltage and large average voltage mean square error of the whole stack during next starting are solved.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to an anode system purge control method, device, equipment and medium. Background Art

[0002] A fuel cell system is a power generation device that converts the chemical energy in fuel and oxidant into electrical energy. In a low-temperature environment, the residual liquid water inside the fuel cell system will freeze, causing the fuel cell system to malfunction and become difficult to operate normally. In particular, the anode system in the fuel cell system cannot be effectively discharged, causing internal freezing, which will affect the cold start performance of the fuel cell system.

[0003] To this end, in the prior art, the anode system is usually purged during the shutdown process of the fuel cell system to reduce the liquid water remaining in the anode system. However, the current anode system purging strategy is unable to purge the liquid water in the anode gas diffusion layer. In a low temperature environment, the liquid water in the anode gas diffusion layer will also freeze, and it will also cause uneven distribution of water content between each single cell, which will cause the fuel cell system to have low single cell voltage and a larger mean square deviation of the average voltage of the entire stack when it is started next time, thereby affecting the power generation performance of the fuel cell system. Summary of the invention

[0004] The present application provides an anode system purge control method, device, equipment and medium to solve the problems of easy ice formation in the anode gas diffusion layer and uneven water content distribution between single cells in the anode system purge strategy in the prior art. Specifically, the technical solution provided by the present application is as follows:

[0005] In one aspect, the present application provides an anode system purge control method, comprising:

[0006] Entering a first purge phase upon receiving a shutdown command, during which a hydrogen circulation pump in an anode system of the fuel cell system is controlled to operate at a first target speed, and a flow control valve in the anode system is controlled to operate at a target opening;

[0007] Determine that the first purge stage continues for a first time and then enters a second purge stage. In the second purge stage, control the hydrogen circulation pump to operate at a second target speed, and control the flow control valve to pulsate at different openings within the first opening range; wherein the second target speed is less than the first target speed;

[0008] Determine that the second purge stage continues for a second time period before entering the third purge stage. In the third purge stage, the hydrogen circulation pump is controlled to be closed, and the flow control valve is controlled to pulsate according to different openings within the second opening range;

[0009] After determining that the third purge stage lasts for a third time period, the flow control valve is controlled to close.

[0010] In one possible implementation, the first target speed is the sum of the hydrogen circulation pump speed when the shutdown command is received and the first speed increment, the second target speed is the sum of the hydrogen circulation pump speed when the shutdown command is received and the second speed increment, the second speed increment and the first speed increment are positive numbers and the second speed increment is less than the first speed increment; the target opening is the flow control valve opening when the shutdown command is received.

[0011] In a possible implementation manner, the anode system purge control method provided in the present application further includes:

[0012] In the first purge stage, the exhaust valve and the drain valve in the anode system are controlled to be closed; in the second purge stage, the exhaust valve is controlled to be opened in stages according to the first exhaust frequency and the drain valve is controlled to be opened in stages according to the first drain frequency; in the third purge stage, the exhaust valve is controlled to be opened in stages according to the second exhaust frequency and the drain valve is controlled to be opened in stages according to the second drain frequency; after the third purge stage lasts for a third time, the exhaust valve and the drain valve are controlled to be closed;

[0013] or;

[0014] In the first purge stage, the exhaust valve and the drain valve in the anode system are controlled to be closed; in the second and third purge stages, the exhaust valve and the drain valve are controlled to be opened; after the third purge stage lasts for a third time, the exhaust valve and the drain valve are controlled to be closed;

[0015] or;

[0016] In the first purge stage, the second purge stage and the third purge stage, the exhaust valve and the drain valve in the anode system are controlled to be closed; after the third purge stage lasts for a third period of time, the exhaust valve and the drain valve are controlled to be opened, and after determining that the exhaust valve and the drain valve are open for a fourth period of time, the exhaust valve and the drain valve are controlled to be closed.

[0017] In a possible implementation, controlling the flow control valve to operate in a pulsating manner according to different openings within a first opening range includes:

[0018] The flow control valve is controlled to operate in a pulsating manner according to the maximum opening and the minimum opening corresponding to the first opening range.

[0019] In a possible implementation manner, controlling the flow control valve to operate in a pulsating manner according to different opening degrees within the second opening range includes:

[0020] The flow control valve is controlled to operate in pulsation according to the maximum opening and minimum opening corresponding to the second opening range; wherein the minimum opening corresponding to the second opening range is not greater than the minimum opening corresponding to the first opening range, and the maximum opening corresponding to the second opening range is less than the maximum opening corresponding to the first opening range.

[0021] In a possible implementation, controlling the flow control valve to operate in a pulsating manner according to different openings within a first opening range includes:

[0022] The flow control valve is controlled to operate in a pulsating manner according to various opening degrees within a first opening range.

[0023] In a possible implementation manner, controlling the flow control valve to operate in a pulsating manner according to different opening degrees within the second opening range includes:

[0024] The flow control valve is controlled to operate in a pulsating manner according to various opening degrees within the second opening range; wherein the maximum opening degree within the second opening range is smaller than the minimum opening degree within the first opening range.

[0025] On the other hand, the present application also provides an anode system purge control device, comprising:

[0026] A first purge unit, configured to enter a first purge phase upon receiving a shutdown command, and in the first purge phase, control a hydrogen circulation pump in an anode system of the fuel cell system to operate at a first target speed, and control a flow control valve in the anode system to operate at a target opening;

[0027] A second purge unit is used to determine that the first purge stage continues for a first time and then enters a second purge stage. In the second purge stage, the hydrogen circulation pump is controlled to operate at a second target speed, and the flow control valve is controlled to operate in a pulsating manner at different openings within the first opening range; wherein the second target speed is less than the first target speed;

[0028] A third purge unit is used to determine that the second purge stage enters a third purge stage after the second purge stage lasts for a second time period, and in the third purge stage, controls the hydrogen circulation pump to be turned off, and controls the flow control valve to pulsate according to different openings within the second opening range;

[0029] The shutdown control unit is used to control the flow control valve to close after determining that the third purge stage lasts for a third time period.

[0030] In one possible implementation, the first target speed is the sum of the hydrogen circulation pump speed when the shutdown command is received and the first speed increment, the second target speed is the sum of the hydrogen circulation pump speed when the shutdown command is received and the second speed increment, the second speed increment and the first speed increment are positive numbers and the second speed increment is less than the first speed increment; the target opening is the flow control valve opening when the shutdown command is received.

[0031] In a possible implementation, the first purge unit is further used to control the exhaust valve and the drain valve in the anode system to close during the first purge stage;

[0032] The second purge unit is further used to control the exhaust valve to be opened in stages according to the first exhaust frequency and to control the drain valve to be opened in stages according to the first drain frequency during the second purge stage;

[0033] The third purge unit is further used to control the exhaust valve to be opened in stages according to the second exhaust frequency and to control the drain valve to be opened in stages according to the second drain frequency during the third purge stage;

[0034] The shutdown control unit is further used to control the exhaust valve and the drain valve to close after the third purge stage lasts for a third time period.

[0035] In a possible implementation, the first purge unit is further used to control the exhaust valve and the drain valve in the anode system to close during the first purge stage;

[0036] The second purge unit is also used to control the opening of the exhaust valve and the drain valve in the second purge stage;

[0037] The third purge unit is also used to control the opening of the exhaust valve and the drain valve during the third purge stage;

[0038] The shutdown control unit is further used to control the exhaust valve and the drain valve to close after the third purge stage lasts for a third time period.

[0039] In a possible implementation, the first purge unit is further used to control the exhaust valve and the drain valve in the anode system to close during the first purge stage;

[0040] The second purge unit is also used to control the exhaust valve and the drain valve to close during the second purge stage;

[0041] The third purge unit is also used to control the exhaust valve and the drain valve to close during the third purge stage;

[0042] The shutdown control unit is also used to control the exhaust valve and the drain valve to open after the third purge stage lasts for a third time period, and to control the exhaust valve and the drain valve to close after determining that the exhaust valve and the drain valve are open for a fourth time period.

[0043] In a possible implementation manner, the second purge unit is specifically used to control the flow control valve to pulsate according to the maximum opening and the minimum opening corresponding to the first opening range.

[0044] In one possible embodiment, the third purge unit is specifically used to control the flow control valve to pulsate according to the maximum opening and minimum opening corresponding to the second opening range; wherein the minimum opening corresponding to the second opening range is not greater than the minimum opening corresponding to the first opening range, and the maximum opening corresponding to the second opening range is less than the maximum opening corresponding to the first opening range.

[0045] In a possible implementation manner, the second purge unit is specifically used to control the flow control valve to operate in a pulsating manner according to various opening degrees within the first opening range.

[0046] In a possible implementation, the third purge unit is specifically used to control the flow control valve to operate in a pulsating manner according to various openings within a second opening range; wherein the maximum opening within the second opening range is smaller than the minimum opening within the first opening range.

[0047] On the other hand, the present application also provides a fuel cell control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the above-mentioned anode system purge control method when executing the computer program.

[0048] On the other hand, the present application also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed by a processor, the above-mentioned anode system purge control method is implemented.

[0049] The beneficial effects of this application are as follows:

[0050] The present application controls the hydrogen circulation pump to operate at a first target speed greater than the second target speed during the first purge stage while controlling the flow control valve to operate at a target opening. The high speed of the hydrogen circulation pump can be used to maintain the pressure difference, thereby bringing out the liquid water in the anode flow channel, thereby achieving the purge of the anode flow channel. Moreover, by controlling the hydrogen circulation pump to operate at a second target speed less than the first target speed during the second purge stage while controlling the flow control valve to pulsate at different openings within the first opening range, the hydrogen pressure difference at the inlet and outlet of the fuel cell stack can be increased as the flow control valve pulsates at different openings within the first opening range, thereby blowing out the water vapor in the anode gas diffusion layer, thereby achieving the purge of the anode gas diffusion layer. In addition, by controlling the hydrogen circulation pump to be closed and controlling the flow control valve to pulsate at different openings within the second opening range during the third purge stage, not only can the The operation of the hydrogen circulation pump will continue to carry out the liquid water that has been purged into the gas-liquid separator in the first purge stage and the second purge stage, thereby shortening the purge time of the anode system, and can also continue to increase the hydrogen pressure difference at the inlet and outlet of the fuel cell stack as the flow control valve pulsates at different openings within the second opening range, thereby blowing out the water vapor in the anode gas diffusion layer, and discharging the wet hydrogen and replacing it with dry hydrogen. In this way, the anode flow channel is purged in the first purge stage, the membrane electrode is purged in the second purge stage, and the wet hydrogen is discharged and replaced with dry hydrogen in the third purge stage, so that purging can be performed at different positions in stages, thereby effectively solving the problem of uneven distribution of water content between single cells, and further effectively alleviating the problem that the fuel cell system is prone to low single cell voltage and increased mean square error of the average voltage of the whole stack when it is started next time due to uneven distribution of water content between single cells, thereby improving the power generation performance of the fuel cell system.

[0051] Other features and advantages of the present application will be described in the subsequent description, and in part, will become apparent from the description, or will be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0053] Figure 1 This is a schematic diagram of the structure of the anode system of the fuel cell system in the embodiment of the present application;

[0054] Figure 2 This is a schematic diagram of an overview of the anode system purge control method in an embodiment of the present application;

[0055] Figure 3 A schematic diagram of a specific process of the anode system purge control method in an embodiment of the present application;

[0056] Figure 4 This is another specific flow chart of the anode system purge control method in the embodiment of the present application;

[0057] Figure 5 It is another specific flow chart of the anode system purge control method in the embodiment of the present application;

[0058] Figure 6 This is a functional structure diagram of the anode system purge control device in the embodiment of the present application;

[0059] Figure 7 Schematic diagram of the hardware structure of the fuel cell control device in the embodiment of the present application. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and beneficial effects of this application clearer, the technical solution in the embodiment of this application will be clearly and completely described below in conjunction with the drawings in the embodiment of this application. Obviously, the described embodiment is only a part of the embodiment of this application, not all the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0061] In order to facilitate those skilled in the art to better understand the present application, the technical terms involved in the present application are briefly introduced below.

[0062] The anode system is the system that supplies hydrogen to the fuel cell stack in the fuel cell system. Figure 1 As shown, the anode system at least includes a flow control valve, an ejector, a hydrogen circulation pump, a pressure relief valve, a gas-liquid separator, a drain valve, an exhaust valve, a stack inlet pressure sensor and a stack outlet pressure sensor, wherein the front end of the flow control valve is a hydrogen pressure source and the flow control valve is used to control the intake pressure and flow of hydrogen, the ejector and the hydrogen circulation pump are used to control the hydrogen circulation, the pressure relief valve is used to open when an overpressure fault occurs in the hydrogen circulation loop to reduce the hydrogen circulation pressure, the gas-liquid separator is used to separate gas from liquid, the drain valve is used to discharge liquid water from the gas-liquid separator, the exhaust valve is used to discharge gaseous water from the gas-liquid separator, the stack inlet pressure sensor is used to collect the stack inlet hydrogen pressure, and the stack outlet pressure sensor is used to collect the stack outlet hydrogen pressure.

[0063] It should be noted that the terms "first", "second", etc. mentioned in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0064] After introducing the technical terms involved in this application, the application scenarios and design concepts of this application are briefly introduced.

[0065] During the shutdown process of the fuel cell system, the traditional anode system purge strategy is to use a fixed flow rate or pressure to purge the anode system so that the liquid water inside the anode system is purged from the anode flow channel to the gas-liquid separator and discharged. This fixed flow rate or pressure purge strategy cannot purge the liquid water in the anode gas diffusion layer. In a low temperature environment, such as when the temperature drops below 0°C after the fuel cell system is shut down, it will also cause the liquid water in the anode gas diffusion layer to freeze, and it will also cause uneven distribution of water content between single cells, which will cause the fuel cell system to have low single cell voltage and large mean square deviation of the average voltage of the entire stack when it is started next time, thereby affecting the power generation performance of the fuel cell system.

[0066] To this end, the present application purges the anode system through three purge stages. Specifically, in the first purge stage, the hydrogen circulation pump is controlled to operate at a first target speed while the flow control valve is controlled to operate at a target opening, so that the high speed of the hydrogen circulation pump can be used to maintain the pressure difference, and then the liquid water in the anode flow channel can be brought out to achieve the purge of the anode flow channel. In the second purge stage, the hydrogen circulation pump is controlled to operate at a second target speed less than the first target speed while the flow control valve is controlled to pulsate at different openings within the first opening range, so that the hydrogen pressure difference between the inlet and outlet of the fuel cell stack can be increased as the flow control valve pulsates at different openings within the first opening range, and then the water vapor in the anode gas diffusion layer can be blown out to achieve the purge of the anode gas diffusion layer. In the third purge stage, the hydrogen circulation pump is controlled to be closed and the flow control valve is controlled to pulsate at different openings within the second opening range. This can not only effectively prevent the operation of the hydrogen circulation pump from continuing to carry out liquid water that has been purged into the gas-liquid separator in the first and second purge stages, thereby shortening the purge time of the anode system, but can also increase the hydrogen pressure difference between the inlet and outlet of the fuel cell stack as the flow control valve pulsates at different openings within the second opening range, thereby blowing out the water vapor in the anode gas diffusion layer and replacing the wet hydrogen with dry hydrogen. In this way, the anode flow channel is purged in the first purge stage, the membrane electrode is purged in the second purge stage, and the wet hydrogen is discharged and replaced with dry hydrogen in the third purge stage, so that purging can be performed at different locations in stages, thereby effectively solving the problem of uneven distribution of water content between single cells, and further effectively alleviating the problem that the fuel cell system is prone to low single cell voltage and increased mean square error of the average voltage of the whole stack when it is started next time due to uneven distribution of water content between single cells, thereby improving the power generation performance of the fuel cell system.

[0067] After introducing the application scenarios and design ideas of the present application, the technical solutions provided by the present application are described in detail below.

[0068] The present application provides an anode system purge control method, which can be applied to a fuel cell control device in a fuel cell system, such as an FCU (Fuel cell Control Unit) in a fuel cell system, or an HCU (Hydrogen Control Unit) in an anode system of a fuel cell system. For details, see Figure 2 As shown, the overview process of the anode system purge control method provided in the embodiment of the present application is as follows:

[0069] Step 201: Entering the first purge phase upon receiving a shutdown command, during which the hydrogen circulation pump in the anode system of the fuel cell system is controlled to operate at a first target speed, and the flow control valve in the anode system is controlled to operate at a target opening.

[0070] In practical applications, the fuel cell system will perform calibration operations before being installed on a new energy vehicle for operation, such as calibrating the speed of the hydrogen circulation pump and the opening of the flow control valve corresponding to different current densities. In the embodiment of the present application, various parameters of the first purge stage during the shutdown process of the fuel cell system are also calibrated, such as the first target speed of the hydrogen circulation pump in the first purge stage and the first duration of the first purge stage. Specifically, when calibrating the first target speed of the hydrogen circulation pump in the first purge stage, the first target speed corresponding to different current densities can be directly calibrated, or the first speed increment corresponding to different current densities can be calibrated based on the speed of the hydrogen circulation pump corresponding to different current densities calibrated according to the traditional calibration method. The first target speed corresponding to different current densities is the sum of the speed of the hydrogen circulation pump corresponding to the current density and the first speed increment; when calibrating the first duration of the first purge stage, the time consumed for purging the liquid water in the anode flow channel to the gas-liquid separator can be calibrated as the first duration.

[0071] Based on this, when a shutdown command is received, the first purge stage is entered. In the first purge stage, the hydrogen circulation pump is controlled to operate at a first target speed corresponding to the current density when the fuel cell system receives the shutdown command, and the flow control valve is controlled to operate at a target opening corresponding to the current density when the fuel cell system receives the shutdown command. By controlling the hydrogen circulation pump to operate at the first target speed and the flow control valve to operate at the target opening in the first purge stage, the high speed of the hydrogen circulation pump can be used to maintain the pressure difference, and then the liquid water in the anode flow channel can be brought out, thereby achieving the purge of the anode flow channel.

[0072] In an embodiment of the present application, in order to minimize hydrogen consumption, in the first purge stage, the exhaust valve and the drain valve can also be controlled to be closed. Specifically, when a shutdown command is received, if the exhaust valve is in an open state, the exhaust valve is controlled to be closed; if the exhaust valve is in a closed state, the exhaust valve is kept closed; similarly, if the drain valve is in an open state, the drain valve is controlled to be closed; if the drain valve is in a closed state, the drain valve is kept closed. Thus, by controlling the exhaust valve and the drain valve to be closed in the first purge stage and controlling the hydrogen circulation pump to operate at a first target speed while controlling the flow control valve to operate at a target opening, the high speed of the hydrogen circulation pump can be used to maintain a pressure difference while minimizing hydrogen consumption, and then the liquid water in the anode flow channel can be brought out, thereby achieving the purge of the anode flow channel.

[0073] Step 202: Determine that the first purge stage lasts for a first time and then enters the second purge stage. In the second purge stage, control the hydrogen circulation pump to operate at a second target speed, and control the flow control valve to pulsate at different openings within the first opening range; wherein the second target speed is less than the first target speed.

[0074] In specific implementation, during the calibration process of the fuel cell system, in addition to calibrating the various parameters of the first purge stage, it is also necessary to calibrate the various parameters of the second purge stage, such as the second target speed of the hydrogen circulation pump in the second purge stage, the first opening range of the flow control valve in the second purge stage, and the second duration of the second purge stage. Specifically, when calibrating the second target speed of the hydrogen circulation pump in the second purge stage, the second target speed corresponding to different current densities can be directly calibrated, or the second speed increment corresponding to different current densities can be calibrated on the basis of the hydrogen circulation pump speed corresponding to different current densities calibrated according to the traditional calibration method. The second target speed corresponding to different current densities is the sum of the hydrogen circulation pump speed corresponding to the current density and the second speed increment. When calibrating the first opening range of the flow control valve in the second purge stage, in one embodiment, it can be calibrated on the basis of the target flow control valve opening that makes the hydrogen pressure at the inlet of the fuel cell stack not less than the atmospheric pressure (i.e., 101 kPaA). The first opening increment is determined, and the first opening range is the range from the target flow control valve opening to the sum of the target flow control valve opening and the first opening increment. For example, assuming that the target flow control valve opening that makes the hydrogen pressure at the inlet of the fuel cell stack not less than the atmospheric pressure (i.e. 101 kPaA) is a and the first opening increment is x, then the first opening range is [a, a+x]. In another embodiment, the first opening range can also be calibrated based on the target flow control valve opening that makes the hydrogen pressure at the inlet of the fuel cell stack not less than the atmospheric pressure (i.e. 101 kPaA). The first opening increment and the second opening increment are obtained, and the second opening increment is greater than the first opening increment. The first opening range is a range from the sum of the target flow control valve opening and the first opening increment to the sum of the target flow control valve opening and the second opening increment. For example, assuming that the target opening is a, the first opening increment is x, and the second opening increment is z, the first opening range is [a+x, a+z]. When calibrating the second duration of the second purge stage, the time consumed for blowing out the water vapor in the anode gas diffusion layer can be calibrated as the second duration.

[0075] Based on this, during the anode system purge process, it is determined that the first purge stage continues for a first time and then enters the second purge stage. In the second purge stage, the hydrogen circulation pump is controlled to operate at a second target speed that is less than the first target speed, and the flow control valve is controlled to pulsate according to different openings within the first opening range. Specifically, when the flow control valve is controlled to pulsate according to different openings within the first opening range, in one embodiment, the flow control valve can be controlled to pulsate according to the maximum opening and the minimum opening corresponding to the first opening range. For example, when the first opening range is [a, a+x], the flow control valve is controlled to alternately cycle and operate (i.e., pulsate) according to a and a+x (in no particular order). When the first opening range is [a+x, a+z], the flow control valve is controlled to alternately cycle and operate (i.e., pulsate) according to a+x and a+z. In another embodiment, the flow control valve can also be controlled to pulsate according to each opening within the first opening range. For example, when the first opening range is [a, a+x], the flow control valve is controlled to alternately cycle and operate (i.e., pulsate) according to a+x and a+z. 0 (x 0 less than x), a+x 1 (x 1 Less than x 0 ), a+x 2 (x 2 Greater than x 1 ), a+x 3 (x 3 Less than x 2 )...Equal openings (no order of precedence) are alternately cycled (i.e., pulsating operation). When the first opening range is [a+x, a+z], the flow control valve is controlled according to a+x, a+z. 0 (z 0 less than z), a+z 1 (z 1 Less than z 0 )、a+z 2 (z 2 Greater than z 1 )、a+z 3 (z 3 Less than z 2 )...are operated alternately and cyclically at equal openings (in no particular order) (i.e., pulsatingly). Thus, by controlling the hydrogen circulation pump to operate at a second target speed less than the first target speed during the second purging stage, while controlling the flow control valve to pulsate at different openings within the first opening range, the hydrogen pressure difference at the inlet and outlet of the fuel cell stack can be increased as the flow control valve pulsates at different openings within the first opening range, thereby blowing out the water vapor in the anode gas diffusion layer, thereby achieving the purging of the anode gas diffusion layer.

[0076] In the embodiment of the present application, in order to discharge the liquid water purged from the anode flow channel to the gas-liquid separator in the first purge stage, in the second purge stage, the exhaust valve and the drain valve can also be controlled to open. In this case, the second duration of the second purge stage can be the time consumed to discharge the liquid water in the gas-liquid separator and blow out the water vapor in the anode gas diffusion layer calibrated during the fuel cell system calibration process. Specifically, when the exhaust valve and the drain valve are controlled to open in the second purge stage, in one embodiment, the exhaust valve and the drain valve can be controlled to be continuously opened in the second purge stage, so that the liquid water purged from the anode flow channel to the gas-liquid separator in the first purge stage can be discharged as the exhaust valve and the drain valve are continuously opened. In another embodiment, the fuel During the calibration of the battery system, the first exhaust frequency of the exhaust valve in the second purge stage and the first drainage frequency of the drain valve in the second purge stage are calibrated. Specifically, the exhaust frequency and drainage frequency corresponding to the complete discharge of the liquid water in the gas-liquid separator can be determined as the first exhaust frequency of the exhaust valve in the second purge stage and the first drainage frequency of the drain valve in the second purge stage. Based on this, in the second purge stage, the exhaust valve can be controlled to be opened in stages according to the first exhaust frequency and the drain valve can be controlled to be opened in stages according to the first drainage frequency, so that with the staged opening of the exhaust valve and the drain valve, the outlet end of the anode system can be depressurized in stages, and the liquid water purged from the anode flow channel to the gas-liquid separator in the first purge stage can be discharged more effectively and quickly. Of course, in the embodiment of the present application, the exhaust valve and the drain valve can also be controlled to remain closed in the second purge stage, and the exhaust valve and the drain valve can be controlled to open again after the anode system purge is completed to discharge the liquid water purged to the gas-liquid separator during the anode system purge process, so as to effectively avoid the problem of freezing of liquid water in the gas-liquid separator in a low temperature environment and affecting the cold start performance of the fuel cell system.

[0077] Step 203: Determine that the second purge stage continues for a second time period before entering the third purge stage. In the third purge stage, the hydrogen circulation pump is controlled to be closed, and the flow control valve is controlled to pulsate according to different openings within the second opening range.

[0078] In specific implementation, during the calibration process of the fuel cell system, in addition to calibrating each parameter of the first purge stage and the second stage, it is also necessary to calibrate each parameter of the third purge stage. For example, calibrate the second opening range of the flow control valve in the third purge stage and the third duration of the third purge stage, etc. Specifically, when calibrating the second opening range of the flow control valve in the third purge stage, a third opening increment smaller than the first opening increment can be calibrated based on the opening of the target flow control valve that makes the hydrogen pressure at the inlet of the fuel cell stack not less than the atmospheric pressure (i.e., 101 kPaA). The second opening range is the range from the opening of the target flow control valve to the sum of the opening of the target flow control valve and the third opening increment. For example, assume the opening of the target flow control valve is a and the first opening increment is x, then the third opening increment can be y (y < x), and the second opening range can be [a, a + y]; when calibrating the third duration of the third purge stage, the duration required to completely blow out the water vapor in the anode gas diffusion layer and completely discharge and replace the wet hydrogen in the anode hydrogen circuit with dry hydrogen can be calibrated as the third duration.

[0079] Based on this, during the purging process of the anode system, after determining that the second purging stage lasts for a second duration, the third purging stage is entered. During the third purging stage, the hydrogen circulation pump is controlled to be closed, and the flow control valve is controlled to pulsate-operate at different opening degrees within a second opening range. Specifically, when controlling the flow control valve to pulsate-operate at different opening degrees within the second opening range, in one embodiment, if during the second purging stage, the flow control valve is controlled to pulsate-operate at the maximum and minimum opening degrees corresponding to a first opening range, then during the third purging stage, the flow control valve can also be controlled to pulsate-operate at the maximum and minimum opening degrees corresponding to the second opening range. In this case, the minimum opening degree corresponding to the second opening range is not greater than the minimum opening degree corresponding to the first opening range, and the maximum opening degree corresponding to the second opening range is less than the maximum opening degree corresponding to the first opening range. For example, assume the first opening range is [a, a + x] and the second opening range is [a, a + y] and y < x. If during the second purging stage, the flow control valve is controlled to alternately circulate (i.e., pulsate-operate) at a and a + x (without a sequence), then during the third purging stage, the flow control valve can be controlled to alternately circulate (i.e., pulsate-operate) at a and a + y (without a sequence). Another example, assume the first opening range is [a + x, a + z] and the second opening range is [a, a + y] and y < x. If during the second purging stage, the flow control valve is controlled to alternately circulate (i.e., pulsate-operate) at a + x and a + z (without a sequence), then during the third purging stage, the flow control valve can be controlled to alternately circulate (i.e., pulsate-operate) at a and a + y (without a sequence); in another embodiment, if during the second purging stage, the flow control valve is controlled to pulsate-operate at each opening degree within the first opening range, then during the third purging stage, the flow control valve can also be controlled to pulsate-operate at each opening degree within the second opening range. In this case, the maximum opening degree within the second opening range is less than the minimum opening degree within the first opening range. For example, assume the first opening range is [a + x, a + z] and the second opening range is [a, a + y] and y < x. During the second purging stage, the flow control valve is controlled to alternately circulate (i.e., pulsate-operate) at a + x, a + z 0 (z 0 less than z)、a + z 1 (z 1 less than z 0 )、a + z 2 (z 2 greater than z 1 )、a + z 3 (z 3 less than z 2 )……and other opening degrees of the same size (without a sequence) to alternately circulate (i.e., pulsate-operate), then during the third purging stage, the flow control valve can be controlled to be at a, a + y 0 (y 0 less than y)、a + y 1 (y1 Less than y 0 ), a+y 2 (y 2 Greater than y 1 ), a+y 3 (y 3 Less than y 2 )...are operated alternately and cyclically at equal openings (in no particular order) (i.e., pulsating operation), thereby controlling the hydrogen circulation pump to be closed in the third purge stage and controlling the flow control valve to pulsate at different openings within the second opening range. This can not only effectively prevent the hydrogen circulation pump from continuing to carry out liquid water that has been purged into the gas-liquid separator in the first purge stage and the second purge stage, thereby shortening the purge time of the anode system, but also increase the hydrogen pressure difference at the inlet and outlet of the fuel cell stack as the flow control valve pulsates at different openings within the second opening range, thereby blowing out the water vapor in the anode gas diffusion layer and discharging the wet hydrogen and replacing it with dry hydrogen.

[0080] In an embodiment of the present application, in order to discharge the liquid water purged into the gas-liquid separator in the first purge stage and the second purge stage, the exhaust valve and the drain valve can also be controlled to open in the third purge stage. In this case, the third duration of the third purge stage can be the time consumed during the calibration of the fuel cell system to discharge all the liquid water in the gas-water separator, blow out all the water vapor in the anode gas diffusion layer, and discharge all the wet hydrogen in the anode hydrogen circuit and replace it with dry hydrogen. Specifically, when the exhaust valve and the drain valve are controlled to open in the second purge stage, in one embodiment, the exhaust valve and the drain valve can be controlled to be continuously opened in the third purge stage, so that the liquid water purged into the gas-liquid separator in the first purge stage and the second purge stage can be discharged as the exhaust valve and the drain valve are continuously opened. In another embodiment, the exhaust valve in the third purge stage can also be controlled during the calibration of the fuel cell system. The second exhaust frequency and the second drain frequency of the drain valve in the third purge stage are calibrated. Specifically, the exhaust frequency and the drain frequency corresponding to the complete discharge of liquid water in the gas-liquid separator and the complete discharge of wet hydrogen in the anode system and replacement with dry hydrogen can be determined as the second exhaust frequency of the exhaust valve in the third purge stage and the second drain frequency of the drain valve in the third purge stage. Based on this, in the third purge stage, the exhaust valve can be controlled to be opened in stages according to the second exhaust frequency and the drain valve can be controlled to be opened in stages according to the second drain frequency. As the exhaust valve and the drain valve are opened in stages, the outlet end of the anode system can continue to be depressurized in stages, and then the liquid water purged into the gas-liquid separator in the first purge stage and the second purge stage can continue to be discharged more effectively and quickly, while the wet hydrogen can be discharged and replaced with dry hydrogen, thereby further reducing the generation of condensed water and further improving the purge effect of the anode system. Of course, in the embodiment of the present application, the exhaust valve and the drain valve can also be controlled to remain closed in the third purge stage, and the exhaust valve and the drain valve can be controlled to open after the anode system purge is completed to discharge the liquid water purged into the gas-liquid separator during the anode system purge process, thereby effectively avoiding the problem of liquid water in the gas-liquid separator freezing in a low temperature environment and affecting the cold start performance of the fuel cell system.

[0081] Step 204: After determining that the third purge stage lasts for a third time period, control the flow control valve to close.

[0082] In specific implementation, during the anode system purge process, after determining that the third purge stage lasts for the third time period, the flow control valve can be controlled to close. In actual applications, if in the second and third purge stages, the exhaust valve and the drain valve are controlled to be continuously or staged open, then after determining that the third purge stage lasts for the third time period, the exhaust valve and the drain valve need to be controlled to be closed. If in the second and third purge stages, the exhaust valve and the drain valve are controlled to remain closed, then after determining that the third purge stage lasts for the third time period, the exhaust valve and the drain valve need to be controlled to be opened. After determining that the exhaust valve and the drain valve are open for the fourth time period, the flow control valve, the exhaust valve and the drain valve are controlled to be closed. The fourth time period is the time consumed to completely discharge the liquid water purged into the gas-liquid separator in the first, second and third purge stages during the fuel cell system calibration process.

[0083] The following takes "the exhaust valve and the drain valve are closed in the first purge stage, the second purge stage and the third purge stage" as an example to further describe the anode system purge control method provided in the embodiment of the present application. Figure 3 As shown, the specific process of the anode system purge control method provided in the embodiment of the present application is as follows:

[0084] Step 301: Enter the first purge stage when a shutdown command is received. In the first purge stage, the hydrogen circulation pump is controlled to operate at a first target speed, and the flow control valve is controlled to operate at a target opening, and the exhaust valve and the drain valve are controlled to be closed; wherein the first target speed is the sum of the hydrogen circulation pump speed corresponding to the current density of the fuel cell system when the shutdown command is received and a first speed increment pre-calibrated for the current density; the target opening is the flow control valve opening corresponding to the current density of the fuel cell system when the shutdown command is received, that is, the flow control valve opening corresponding to the stack inlet hydrogen pressure required for the fuel cell system to operate normally at the shutdown power point.

[0085] Step 302: Determine that the first purge stage enters the second purge stage after lasting for a first time period. In the second purge stage, control the hydrogen circulation pump to operate at a second target speed that is less than the first target speed, control the flow control valve to pulsate at different openings within the first opening range, and control the exhaust valve and the drain valve to remain closed; wherein the first time period is a pre-calibrated time period for completely purging the liquid water in the anode flow channel to the gas-liquid separator in the first purge stage; and the second target speed is the sum of the hydrogen circulation pump speed corresponding to the current density of the fuel cell system when the shutdown command is received and a second speed increment pre-calibrated for the current density, and the second speed increment is less than the first speed increment.

[0086] Step 303: Determine that the second purge stage enters the third purge stage after the second purge stage lasts for a second time period. In the third purge stage, the hydrogen circulation pump is controlled to be closed, and the flow control valve is controlled to pulsate according to different openings within the second opening range, and the exhaust valve and the drain valve are controlled to remain closed; wherein the second time period is a pre-calibrated time period required to completely blow out the water vapor in the anode gas diffusion layer in the second purge stage.

[0087] Step 304: after determining that the third purge stage lasts for a third time period, the exhaust valve and the drain valve are controlled to be opened; after determining that the exhaust valve and the drain valve are opened for a fourth time period, the flow control valve, the exhaust valve and the drain valve are controlled to be closed; wherein, the third time period is a pre-calibrated time period for completely blowing out the water vapor in the anode gas diffusion layer and completely discharging the wet hydrogen in the anode hydrogen circuit and replacing it with dry hydrogen in the third purge stage; the fourth time period is a pre-calibrated time period for completely discharging the liquid water purged into the gas-liquid separator in the first purge stage, the second purge stage and the third purge stage.

[0088] The following takes "the exhaust valve and the drain valve are closed in the first purge stage, and continuously opened in the second purge stage and the third purge stage" as an example to further describe the anode system purge control method provided in the embodiment of the present application. Figure 4 As shown, the specific process of the anode system purge control method provided in the embodiment of the present application is as follows:

[0089] Step 401: Entering the first purge stage when a shutdown command is received, in which the hydrogen circulation pump is controlled to operate at a first target speed, the flow control valve is controlled to operate at a target opening, and the exhaust valve and the drain valve are controlled to be closed; wherein the first target speed is the sum of the hydrogen circulation pump speed corresponding to the current density of the fuel cell system when the shutdown command is received and a first speed increment pre-calibrated for the current density; the target opening is the flow control valve opening corresponding to the current density of the fuel cell system when the shutdown command is received, that is, the flow control valve opening corresponding to the stack inlet hydrogen pressure required for the fuel cell system to operate normally at the shutdown power point.

[0090] Step 402: Determine that the first purge stage enters the second purge stage after the first duration. In the second purge stage, control the hydrogen circulation pump to operate at a second target speed that is less than the first target speed, control the flow control valve to pulsate at different openings within the first opening range, and control the exhaust valve and the drain valve to be continuously opened; wherein, the first duration is a pre-calibrated time required to completely purge the liquid water in the anode flow channel to the gas-liquid separator in the first purge stage; and the second target speed is the sum of the hydrogen circulation pump speed corresponding to the current density of the fuel cell system when the shutdown command is received and a second speed increment pre-calibrated for the current density, and the second speed increment is less than the first speed increment.

[0091] Step 403: Determine that the second purge stage enters the third purge stage after the second time period has passed. In the third purge stage, the hydrogen circulation pump is controlled to be closed, and the flow control valve is controlled to pulsate according to different openings within the second opening range, and the exhaust valve and the drain valve are controlled to continue to be opened continuously; wherein the second time period is a pre-calibrated time period consumed in the second purge stage to discharge the liquid water in the gas-liquid separator and blow out the water vapor in the anode gas diffusion layer.

[0092] Step 404: After determining that the third purge stage lasts for a third time period, control the flow control valve, the exhaust valve and the drain valve to close; wherein the third time period is a pre-calibrated time period for completely discharging the liquid water in the gas-liquid separator, completely blowing out the water vapor in the anode gas diffusion layer, and completely discharging the wet hydrogen in the anode hydrogen loop and replacing it with dry hydrogen during the third purge stage.

[0093] The following takes "the exhaust valve and the drain valve are closed in the first purge stage, and opened in stages in the second purge stage and the third purge stage" as an example to further describe the anode system purge control method provided in the embodiment of the present application. Figure 5 As shown, the specific process of the anode system purge control method provided in the embodiment of the present application is as follows:

[0094] Step 501: Enter the first purge stage when a shutdown command is received. In the first purge stage, the hydrogen circulation pump is controlled to operate at a first target speed, and the flow control valve is controlled to operate at a target opening, and the exhaust valve and the drain valve are controlled to be closed; wherein the first target speed is the sum of the hydrogen circulation pump speed corresponding to the current density of the fuel cell system when the shutdown command is received and a first speed increment pre-calibrated for the current density; the target opening is the flow control valve opening corresponding to the current density of the fuel cell system when the shutdown command is received, that is, the flow control valve opening corresponding to the stack inlet hydrogen pressure required for the fuel cell system to operate normally at the shutdown power point.

[0095] Step 502: Determine that the first purge stage enters the second purge stage after the first duration. In the second purge stage, the hydrogen circulation pump is controlled to operate at a second target speed that is less than the first target speed, and the flow control valve is controlled to pulsate at different openings within the first opening range, and the exhaust valve is controlled to be opened in stages according to the first exhaust frequency and the drain valve is controlled to be opened in stages according to the first drain frequency; wherein the first duration is a pre-calibrated time required to completely purge the liquid water in the anode flow channel to the gas-liquid separator in the first purge stage; the second target speed is the sum of the hydrogen circulation pump speed corresponding to the current density of the fuel cell system when the shutdown command is received and a second speed increment pre-calibrated for the current density, and the second speed increment is less than the first speed increment; the first exhaust frequency and the first drain frequency are pre-calibrated exhaust frequencies and drain frequencies corresponding to the discharge of all liquid water in the gas-liquid separator in the second purge stage.

[0096] Step 503: Determine that the second purge stage enters the third purge stage after the second duration. In the third purge stage, the hydrogen circulation pump is controlled to be closed, and the flow control valve is controlled to pulsate according to different openings within the second opening range, and the exhaust valve is controlled to be opened in stages according to the second exhaust frequency and the drain valve is controlled to be opened in stages according to the second drain frequency; wherein the second duration is a pre-calibrated time consumed in the second purge stage to discharge the liquid water in the gas-liquid separator and blow out the water vapor in the anode gas diffusion layer; the second exhaust frequency and the second drain frequency are pre-calibrated exhaust frequencies and drain frequencies corresponding to the discharge of liquid water in the gas-liquid separator and the discharge and replacement of wet hydrogen in the anode system with dry hydrogen in the third purge stage.

[0097] Step 504: After determining that the third purge stage lasts for a third time period, control the flow control valve, the exhaust valve and the drain valve to close; wherein the third time period is a pre-calibrated time period for completely discharging the liquid water in the gas-liquid separator and completely blowing out the water vapor in the anode gas diffusion layer during the third purge stage, while completely discharging the wet hydrogen in the anode hydrogen circuit and replacing it with dry hydrogen.

[0098] Based on the above embodiments, the present application also provides an anode system purge control device, see Figure 6 As shown, the anode system purge control device 600 provided in the embodiment of the present application at least includes:

[0099] A first purge unit 601 is used to enter a first purge phase upon receiving a shutdown command, and in the first purge phase, control a hydrogen circulation pump in an anode system of the fuel cell system to operate at a first target speed, and control a flow control valve in the anode system to operate at a target opening;

[0100] The second purge unit 602 is used to determine that the first purge stage continues for a first time and then enters the second purge stage. In the second purge stage, the hydrogen circulation pump is controlled to operate at a second target speed, and the flow control valve is controlled to operate in a pulsating manner at different openings within the first opening range; wherein the second target speed is less than the first target speed;

[0101] The third purge unit 603 is used to determine that the second purge stage continues for a second time period before entering the third purge stage. In the third purge stage, the hydrogen circulation pump is controlled to be turned off, and the flow control valve is controlled to operate in a pulsating manner according to different openings within the second opening range;

[0102] The shutdown control unit 604 is used to control the flow control valve to close after determining that the third purge stage lasts for a third time period.

[0103] In one possible implementation, the first target speed is the sum of the hydrogen circulation pump speed when the shutdown command is received and the first speed increment, the second target speed is the sum of the hydrogen circulation pump speed when the shutdown command is received and the second speed increment, the second speed increment and the first speed increment are positive numbers and the second speed increment is less than the first speed increment; the target opening is the flow control valve opening when the shutdown command is received.

[0104] In a possible implementation, the first purge unit 601 is further used to control the exhaust valve and the drain valve in the anode system to close during the first purge stage;

[0105] The second purge unit 602 is further used to control the exhaust valve to be opened in stages according to the first exhaust frequency and to control the drain valve to be opened in stages according to the first drain frequency during the second purge stage;

[0106] The third purge unit 603 is further used to control the exhaust valve to be opened in stages according to the second exhaust frequency and to control the drain valve to be opened in stages according to the second drain frequency during the third purge stage;

[0107] The shutdown control unit 604 is further used to control the exhaust valve and the drain valve to close after the third purge stage lasts for a third time period.

[0108] In a possible implementation, the first purge unit 601 is further used to control the exhaust valve and the drain valve in the anode system to close during the first purge stage;

[0109] The second purge unit 602 is also used to control the opening of the exhaust valve and the drain valve in the second purge stage;

[0110] The third purge unit 603 is also used to control the opening of the exhaust valve and the drain valve in the third purge stage;

[0111] The shutdown control unit 604 is further used to control the exhaust valve and the drain valve to close after the third purge stage lasts for a third time period.

[0112] In a possible implementation, the first purge unit 601 is further used to control the exhaust valve and the drain valve in the anode system to close during the first purge stage;

[0113] The second purge unit 602 is also used to control the exhaust valve and the drain valve to close during the second purge stage;

[0114] The third purge unit 603 is also used to control the exhaust valve and the drain valve to close during the third purge stage;

[0115] The shutdown control unit 604 is also used to control the exhaust valve and the drain valve to open after the third purge stage lasts for a third time period, and to control the exhaust valve and the drain valve to close after the exhaust valve and the drain valve are opened for a fourth time period.

[0116] In a possible implementation manner, the second purge unit 602 is specifically used to control the flow control valve to pulsate according to the maximum opening and the minimum opening corresponding to the first opening range.

[0117] In one possible implementation, the third purge unit 603 is specifically used to control the flow control valve to pulsate according to the maximum opening and minimum opening corresponding to the second opening range; wherein the minimum opening corresponding to the second opening range is not greater than the minimum opening corresponding to the first opening range, and the maximum opening corresponding to the second opening range is less than the maximum opening corresponding to the first opening range.

[0118] In a possible implementation, the second purge unit 602 is specifically used to control the flow control valve to operate in a pulsating manner according to various opening degrees within the first opening range.

[0119] In a possible implementation, the third purge unit 603 is specifically used to control the flow control valve to operate in a pulsating manner according to various openings within a second opening range; wherein the maximum opening within the second opening range is smaller than the minimum opening within the first opening range.

[0120] It should be noted that the principle of solving the technical problem by the anode system purge control device 600 provided in the embodiment of the present application is similar to the anode system purge control method provided in the embodiment of the present application. Therefore, the implementation of the anode system purge control device 600 provided in the embodiment of the present application can refer to the implementation of the anode system purge control method provided in the embodiment of the present application, and the repeated parts will not be repeated.

[0121] After introducing the anode system purge control method and device provided in the embodiment of the present application, the fuel cell control device provided in the embodiment of the present application is briefly introduced next.

[0122] The fuel cell control device provided in the embodiment of the present application may be, but is not limited to, an FCU, an HCU, etc. For details, see Figure 7 As shown, the fuel cell control device 700 provided in the embodiment of the present application includes at least a processor 701, a memory 702, and a computer program stored in the memory 702 and executable on the processor 701. When the processor 701 executes the computer program, the above-mentioned anode system purge control method provided in the embodiment of the present application is implemented.

[0123] The fuel cell control device 700 provided in the embodiment of the present application may also include a bus 703 connecting different components (including the processor 701 and the memory 702). The bus 703 represents one or more of several types of bus structures, including a memory bus, a peripheral bus, a local bus, and the like.

[0124] The memory 702 may include a readable medium in the form of a volatile memory, such as a RAM (Random Access Memory) 7021 and / or a cache memory 7022, and may further include a ROM (Read Only Memory) 7023. The memory 702 may also include a program tool 7025 having a group (at least one) of program modules 7024, and the program modules 7024 include but are not limited to: an operating subsystem, one or more application programs, other program modules, and program data, each of which or some combination may include the implementation of a network environment.

[0125] The fuel cell control device 700 can also communicate with one or more devices that enable users to interact with the fuel cell control device 700 (such as mobile phones, computers, etc.), and / or various external devices 704 such as devices that enable the fuel cell control device 700 to communicate with one or more other fuel cell control devices 700 (such as routers, modems, etc.). This communication can be carried out through the I / O (Input / Output) interface 705. In addition, the fuel cell control device 700 can also communicate with one or more networks (such as LAN (Local Area Network), WAN (Wide Area Network) and / or public networks, such as the Internet) through a network adapter 706. Figure 7 As shown, the network adapter 706 communicates with other modules of the fuel cell control device 700 via the bus 703. It should be understood that although Figure 7Not shown, other hardware and / or software modules may be used in conjunction with the fuel cell control device 700, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (Redundant Arrays of Independent Disks) subsystems, tape drives, and data backup storage subsystems.

[0126] It should be noted that Figure 7 The fuel cell control device 700 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0127] Based on the above embodiments, an embodiment of the present application also provides a fuel cell system, which fuel cell system at least includes a fuel cell stack, an anode system for supplying hydrogen to the fuel cell stack, a cathode system for supplying air to the fuel cell stack, a cooling system for cooling the fuel cell stack, and the above-mentioned fuel cell control device provided in the embodiment of the present application.

[0128] In addition, an embodiment of the present application also provides a new energy vehicle, which includes at least a body, a chassis frame, wheels, an electric motor, a vehicle control system, and the above-mentioned fuel cell system provided in an embodiment of the present application.

[0129] In addition, the embodiment of the present application further provides a computer-readable storage medium, which stores computer instructions, and when the computer instructions are executed by the processor, the anode system purge control method provided in the embodiment of the present application is implemented. Specifically, the computer instructions can be built-in or installed in the processor, so that the processor can implement the above-mentioned anode system purge control method provided in the embodiment of the present application by executing the built-in or installed computer instructions.

[0130] In addition, the anode system purge control method provided in the embodiment of the present application can also be implemented as a program product, which includes a program code. When the program code is executed by a processor, the above-mentioned anode system purge control method provided in the embodiment of the present application is implemented.

[0131] The program product provided in the embodiments of the present application may adopt any combination of one or more readable media, wherein the readable medium may be a readable signal medium or a readable storage medium, and the readable storage medium may be but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any combination of the above. Specifically, more specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable disk, a hard disk, RAM, ROM, EPROM (Erasable Programmable Read Only Memory), optical fiber, CD-ROM (Compact Disc Read-Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0132] The program product provided in the embodiment of the present application may adopt a CD-ROM and include program code, and may also be run on a fuel cell control device such as an FCU, HCU, etc. However, the program product provided in the embodiment of the present application is not limited thereto, and in the embodiment of the present application, the readable storage medium may be any tangible medium containing or storing a program, and the program may be used by or in combination with an instruction execution system, apparatus, or device.

[0133] It should be noted that, although several units or subunits of the device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more units described above can be embodied in one unit. Conversely, the features and functions of one unit described above can be further divided into multiple units to be embodied.

[0134] In addition, although the operations of the method of the present application are described in a specific order in the drawings, this does not require or imply that the operations must be performed in this specific order, or that all the operations shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0135] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0136] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for controlling the purge of an anode system, characterized in that: include: Entering a first purge phase upon receiving a shutdown command, during which a hydrogen circulation pump in an anode system of the fuel cell system is controlled to operate at a first target speed, and a flow control valve in the anode system is controlled to operate at a target opening; Determining that the first purge stage continues for a first time period before entering a second purge stage, and in the second purge stage, controlling the hydrogen circulation pump to operate at a second target speed, and controlling the flow control valve to pulsate at different openings within the first opening range; wherein the second target speed is less than the first target speed; Determine that the second purge stage continues for a second time period before entering a third purge stage, and in the third purge stage, control the hydrogen circulation pump to be turned off, and control the flow control valve to pulsate according to different openings within the second opening range; After determining that the third purge stage lasts for a third time period, the flow control valve is controlled to close.

2. The anode system purge control method according to claim 1, characterized in that: The first target speed is the sum of the hydrogen circulation pump speed when the shutdown command is received and the first speed increment, the second target speed is the sum of the hydrogen circulation pump speed when the shutdown command is received and the second speed increment, the second speed increment and the first speed increment are positive numbers and the second speed increment is less than the first speed increment; the target opening is the flow control valve opening when the shutdown command is received.

3. The anode system purge control method according to claim 1, characterized in that: Also includes: In the first purge stage, the exhaust valve and the drain valve in the anode system are controlled to be closed; In the second purge stage, the exhaust valve is controlled to be opened in stages according to the first exhaust frequency and the drain valve is controlled to be opened in stages according to the first drain frequency; in the third purge stage, the exhaust valve is controlled to be opened in stages according to the second exhaust frequency and the drain valve is controlled to be opened in stages according to the second drain frequency; after the third purge stage lasts for the third time period, the exhaust valve and the drain valve are controlled to be closed; or; In the first purge stage, the exhaust valve and the drain valve in the anode system are controlled to be closed; in the second purge stage and the third purge stage, the exhaust valve and the drain valve are controlled to be opened; after the third purge stage lasts for the third time period, the exhaust valve and the drain valve are controlled to be closed; or; In the first purge stage, the second purge stage and the third purge stage, the exhaust valve and the drain valve in the anode system are controlled to be closed; after the third purge stage lasts for the third time period, the exhaust valve and the drain valve are controlled to be opened, and after determining that the exhaust valve and the drain valve are open for a fourth time period, the exhaust valve and the drain valve are controlled to be closed.

4. The anode system purge control method according to any one of claims 1 to 3, characterized in that: Controlling the flow control valve to operate in a pulsating manner according to different openings within a first opening range includes: The flow control valve is controlled to operate in a pulsating manner according to the maximum opening and the minimum opening corresponding to the first opening range.

5. The anode system purge control method according to claim 4, characterized in that: Controlling the flow control valve to operate in a pulsating manner according to different opening degrees within a second opening range includes: The flow control valve is controlled to pulsate according to the maximum opening and minimum opening corresponding to the second opening range; wherein the minimum opening corresponding to the second opening range is not greater than the minimum opening corresponding to the first opening range, and the maximum opening corresponding to the second opening range is less than the maximum opening corresponding to the first opening range.

6. The anode system purge control method according to any one of claims 1 to 3, characterized in that: Controlling the flow control valve to operate in a pulsating manner according to different openings within a first opening range includes: The flow control valve is controlled to operate in a pulsating manner according to various opening degrees within the first opening range.

7. The anode system purge control method according to claim 6, characterized in that: Controlling the flow control valve to operate in a pulsating manner according to different opening degrees within a second opening range includes: The flow control valve is controlled to operate in a pulsating manner according to various opening degrees within the second opening range; wherein the maximum opening degree within the second opening range is smaller than the minimum opening degree within the first opening range.

8. An anode system purge control device, characterized in that: include: A first purge unit, configured to enter a first purge phase upon receiving a shutdown command, and in the first purge phase, control a hydrogen circulation pump in an anode system of the fuel cell system to operate at a first target speed, and control a flow control valve in the anode system to operate at a target opening; A second purge unit is used to determine that the first purge stage continues for a first time and then enters a second purge stage. In the second purge stage, the hydrogen circulation pump is controlled to operate at a second target speed, and the flow control valve is controlled to operate in a pulsating manner at different openings within the first opening range; wherein the second target speed is less than the first target speed; A third purge unit is used to determine that the second purge stage enters a third purge stage after the second purge stage lasts for a second time period, and in the third purge stage, controls the hydrogen circulation pump to be turned off, and controls the flow control valve to pulsate according to different openings within a second opening range; A shutdown control unit is used to control the flow control valve to close after determining that the third purge stage lasts for a third time period.

9. A fuel cell control device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the anode system purge control method according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the anode system purge control method according to any one of claims 1 to 7 is implemented.

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