Exhaust control method, device, computer equipment and storage medium

Abstract

The present application relates to an exhaust control method, device, computer equipment, storage medium and computer program product. The method includes: a control unit obtains the volume of nitrogen in the cathode inlet, the current value of the inverter connected to the stack and the hydrogen inlet pressure at the anode inlet; the control unit determines the density of the gas in the stack according to the volume of nitrogen in the cathode inlet and the hydrogen inlet pressure; the control unit determines the required exhaust volume according to the current value of the inverter connected to the stack and the current integral value within a preset time period; the control unit determines the exhaust opening time based on the density of the gas in the stack and the required exhaust volume; the control unit controls the exhaust valve to open and close based on the exhaust opening time. The use of this method can improve the exhaust control efficiency of the exhaust valve.

Description

Technical Field

[0001] The present application relates to the technical field of automobile engine electronic control, and in particular to an exhaust control method, device, computer equipment, storage medium and computer program product. Background Art

[0002] In the field of new energy, fuel cell vehicles use hydrogen as fuel, and the exhaust valve is one of the important control actuators in the hydrogen system. When the fuel cell is working, hydrogen and oxygen undergo an electrochemical reaction to generate water. A large amount of oxygen in the air is consumed in this process. Since nitrogen in the air is a low-activity gas, as the fuel cell works, more and more nitrogen accumulates at the anode. If the opening duration and frequency of the exhaust valve are not reasonably controlled, the hydrogen content in the exhaust will be too high or the nitrogen will not be discharged in time, and the stack will not be able to reach the rated power.

[0003] The current exhaust control method often achieves exhaust control by controlling the opening and closing of the exhaust valve with a fixed opening duration and a fixed opening frequency. However, this control method will cause the exhaust valve to be frequently opened for a long time when the opening duration of the exhaust valve is long and the opening frequency is too high, which will cause the nitrogen to be discharged from the fuel cell system without a large amount of accumulation. The proportion of hydrogen in the mixture of nitrogen and hydrogen is relatively high. On the one hand, it will cause the consumption of hydrogen as a fuel to be too high, which is poor in economy; on the other hand, it will cause the concentration of hydrogen discharged into the air to be too high, which is low in safety. When the opening duration of the exhaust valve is short and the opening frequency is too low, the exhaust valve will be opened at a low frequency for a short time, which will cause the nitrogen accumulated in the fuel cell system to be unable to be effectively discharged. The proportion of anode hydrogen fuel is low. If it continues to operate under this condition for a long time, it will cause the fuel cell to stop working due to lack of fuel. Therefore, the existing exhaust control method has the problem of low exhaust control efficiency. Summary of the invention

[0004] Based on this, it is necessary to provide an exhaust control method, device, computer equipment, computer-readable storage medium and computer program product that can improve the exhaust efficiency in order to address the problem of low exhaust efficiency in traditional exhaust control methods.

[0005] In a first aspect, the present application provides an exhaust control method, which is applied to a fuel cell. The fuel cell includes a stack, an exhaust valve and a control unit. The stack includes an air inlet and an air outlet. The air inlet includes an anode inlet and a cathode inlet. The anode inlet is used to input hydrogen, and the cathode inlet is used to input air. The exhaust valve is connected to the air outlet. The air outlet and the exhaust valve are used to discharge the gas to be discharged generated by the stack. The control unit is respectively connected to the exhaust valve and the air inlet. The method includes:

[0006] The control unit obtains the volume of nitrogen at the cathode inlet, the current value of the converter connected to the stack, and the hydrogen inlet pressure at the anode inlet;

[0007] The control unit determines the density of the gas in the fuel cell stack according to the volume of nitrogen in the cathode inlet and the pressure of hydrogen entering the stack;

[0008] The control unit determines the required exhaust volume according to the current value of the converter connected to the battery stack and the current integral value within a preset time period;

[0009] The control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the required exhaust volume;

[0010] The control unit controls the opening and closing of the exhaust valve based on the exhaust opening time.

[0011] In one embodiment, the control unit determines the density of the gas in the fuel cell stack according to the volume of nitrogen in the cathode inlet and the hydrogen inlet pressure, including:

[0012] The control unit obtains the gas temperature in the battery stack;

[0013] The control unit determines the volume of hydrogen to be input into the anode inlet according to the volume of nitrogen in the cathode inlet;

[0014] The control unit determines the density of the gas in the fuel cell stack based on the volume of the nitrogen, the volume of the hydrogen, the gas constant of the nitrogen, the gas constant of the hydrogen, the gas temperature in the fuel cell stack, and the hydrogen inlet pressure.

[0015] In one embodiment, the control unit determines the required exhaust volume according to the current value of the converter connected to the battery stack and the current integral value within a preset time period, including:

[0016] The control unit looks up a table to obtain a corresponding first exhaust volume according to the current value of the converter connected to the battery stack and the first mapping relationship;

[0017] The control unit multiplies the first exhaust volume by the current integral value within a preset time period to determine the required exhaust volume.

[0018] In one embodiment, the control unit determines the exhaust start time based on the density of the gas in the fuel cell stack and the required exhaust volume, including:

[0019] The control unit obtains a corresponding correction coefficient by looking up a table according to the gas temperature and the second mapping relationship;

[0020] The control unit multiplies the correction coefficient by the required exhaust volume to obtain the corrected required exhaust volume;

[0021] The control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume.

[0022] In one embodiment, the control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume, including:

[0023] The control unit obtains the exhaust hole diameter and the atmospheric pressure;

[0024] The control unit obtains the flow coefficient according to the isentropic index, the atmospheric pressure and the hydrogen inlet pressure;

[0025] The control unit determines the mass flow rate of the gas in the fuel cell stack according to the flow coefficient, the hydrogen inlet pressure, the corrected required exhaust volume and the exhaust hole diameter;

[0026] The control unit determines the exhaust opening time according to the density of the gas in the fuel cell stack, the corrected required exhaust volume and the mass flow rate of the gas in the fuel cell stack.

[0027] In one embodiment, the control unit controls the opening and closing of the exhaust valve based on the exhaust opening time, including:

[0028] The control unit obtains the hydrogen concentration change rate;

[0029] The control unit determines a corresponding exhaust cycle according to the hydrogen concentration change rate and the third mapping relationship;

[0030] The control unit controls the opening and closing of the exhaust valve based on the exhaust opening time and the exhaust cycle.

[0031] In a second aspect, the present application further provides an exhaust control device, the device comprising:

[0032] An acquisition module is used to control the control unit to acquire the volume of nitrogen at the cathode inlet, the current value of the converter connected to the stack, and the hydrogen inlet pressure at the anode inlet;

[0033] A density determination module is used to control the control unit to determine the density of the gas in the fuel cell stack according to the volume of nitrogen in the cathode inlet and the hydrogen inlet pressure;

[0034] An exhaust volume determination module is used for the control unit to determine the required exhaust volume according to the current value of the converter connected to the battery stack and the current integral value within a preset time period;

[0035] A time determination module, used for the control unit to determine the exhaust start time based on the density of the gas in the fuel cell stack and the required exhaust volume;

[0036] The control module is used to control the opening and closing of the exhaust valve based on the exhaust opening time.

[0037] In a third aspect, the present application also provides a fuel cell, which includes a fuel cell stack, an exhaust valve and a control unit, the fuel cell stack includes an air inlet and an air outlet, the air inlet includes an anode inlet and a cathode inlet, the anode inlet is used to input hydrogen, the cathode inlet is used to input air, the exhaust valve is connected to the air outlet, the air outlet and the exhaust valve are used to discharge the gas to be exhausted generated by the fuel cell stack, the control unit is respectively connected to the exhaust valve and the air inlet, and the control unit is used to execute the steps of the exhaust control method.

[0038] In a fourth aspect, the present application further provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0039] The control unit obtains the volume of nitrogen at the cathode inlet, the current value of the converter connected to the stack, and the hydrogen inlet pressure at the anode inlet;

[0040] The control unit determines the density of the gas in the fuel cell stack according to the volume of nitrogen in the cathode inlet and the pressure of hydrogen entering the stack;

[0041] The control unit determines the required exhaust volume according to the current value of the converter connected to the battery stack and the current integral value within a preset time period;

[0042] The control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the required exhaust volume;

[0043] The control unit controls the opening and closing of the exhaust valve based on the exhaust opening time.

[0044] In a fifth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0045] The control unit obtains the volume of nitrogen at the cathode inlet, the current value of the converter connected to the stack, and the hydrogen inlet pressure at the anode inlet;

[0046] The control unit determines the density of the gas in the fuel cell stack according to the volume of nitrogen in the cathode inlet and the pressure of hydrogen entering the stack;

[0047] The control unit determines the required exhaust volume according to the current value of the converter connected to the battery stack and the current integral value within a preset time period;

[0048] The control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the required exhaust volume;

[0049] The control unit controls the opening and closing of the exhaust valve based on the exhaust opening time.

[0050] In a sixth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0051] The control unit obtains the volume of nitrogen at the cathode inlet, the current value of the converter connected to the stack, and the hydrogen inlet pressure at the anode inlet;

[0052] The control unit determines the density of the gas in the fuel cell stack according to the volume of nitrogen in the cathode inlet and the pressure of hydrogen entering the stack;

[0053] The control unit determines the required exhaust volume according to the current value of the converter connected to the battery stack and the current integral value within a preset time period;

[0054] The control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the required exhaust volume;

[0055] The control unit controls the opening and closing of the exhaust valve based on the exhaust opening time.

[0056] The above-mentioned exhaust control method, device, computer equipment, storage medium and computer program product determine the density of the gas in the stack by the volume of nitrogen in the cathode inlet and the hydrogen inlet pressure at the anode inlet obtained by the control unit; determine the required exhaust volume according to the current value of the converter connected to the stack and the current integral value within a preset time period obtained by the control unit; and control the opening and closing of the exhaust valve based on the exhaust opening time determined by the density of the gas in the stack and the required exhaust volume. This exhaust control method can dynamically determine the exhaust opening time of the exhaust valve according to the actual situation of the nitrogen volume at the air inlet of the fuel cell stack, the hydrogen inlet pressure and the converter current value, thereby improving the exhaust control efficiency of the exhaust valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 is an application environment diagram of an exhaust control method in an embodiment;

[0058] Figure 2 A schematic diagram of a flow chart of an exhaust control method in one embodiment;

[0059] Figure 3 Schematic diagram of a sub-process of S202 in one embodiment;

[0060] Figure 4 Schematic diagram of a sub-process of S204 in one embodiment;

[0061] Figure 5 Schematic diagram of a sub-process of S406 in one embodiment;

[0062] Figure 6 Schematic diagram of a sub-process of S205 in one embodiment;

[0063] Figure 7 A schematic diagram of the structure of a fuel cell stack exhaust control in one embodiment;

[0064] Figure 8 A schematic diagram of the reaction principle of a fuel cell in one embodiment;

[0065] Fig. 9 is a structural block diagram of an exhaust control device in one embodiment;

[0066] Fig.10 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0068] The exhaust control method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. The exhaust control method is applied to a fuel cell 101, the fuel cell includes a stack 102, an exhaust valve 103 and a control unit 104, the stack 102 includes an air inlet 105 and an air outlet 106, the air inlet 105 includes an anode inlet 107 and a cathode inlet 108, the anode inlet 107 is used to input hydrogen, the cathode inlet 108 is used to input air, the exhaust valve 103 is connected to the air outlet 106, the air outlet 106 and the exhaust valve 103 are used to discharge the gas to be discharged generated by the stack 102, and the control unit 104 is connected to the exhaust valve 103 and the air inlet 105 respectively. The control unit 104 executes the exhaust control method. The control unit 104 can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, Internet of Things devices and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, etc. Portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc.

[0069] In one embodiment, Figure 2 As shown, an exhaust control method is provided, which is applied to Figure 1 The control unit 104 in the example is used as an example to illustrate, and the following steps are included:

[0070] S201, the control unit obtains the volume of nitrogen at the cathode inlet, the current value of the inverter connected to the fuel cell stack, and the hydrogen inlet pressure at the anode inlet.

[0071] Wherein, the control unit is an electronic control unit in the fuel cell. The control unit is connected to the exhaust valve and the air inlet respectively, and can be used to obtain relevant data at the air inlet or control the opening and closing of the exhaust valve. The fuel cell stack includes an air inlet and an air outlet, wherein the air inlet includes an anode inlet and a cathode inlet. The anode inlet is used to input hydrogen, and the cathode inlet is used to input air. The volume of nitrogen refers to the volume of nitrogen in the air input from the cathode inlet of the stack. In some embodiments, the hydrogen and nitrogen input at the air inlet need to keep the ratio of hydrogen and nitrogen in the fuel cell stack between 7:3 and 9:1.

[0072] The converter refers to a DC-DC (DC-DC converter) converter. The DC-DC converter includes two input terminals, namely a high-end input terminal and a low-end input terminal, and two output terminals. The low-end current of the fuel cell stack is input into the DC-DC converter through the low end of the DC-DC converter. The current value of the converter connected to the stack refers to the low-end input current of the DC-DC converter. The hydrogen inlet pressure refers to the hydrogen pressure entering the stack from the anode inlet of the stack.

[0073] Specifically, the control unit obtains the volume of nitrogen in the cathode inlet, the current value of the inverter connected to the stack, and the hydrogen inlet pressure at the anode inlet.

[0074] S202, the control unit determines the density of the gas in the fuel cell stack according to the volume of nitrogen at the cathode inlet and the hydrogen inlet pressure.

[0075] Among them, the gases in the stack mainly include incompletely reacted hydrogen, nitrogen that permeates from the cathode inlet to the anode inlet, and other gases. Among them, since the cathode inlet of the fuel cell stack is mainly through direct inhalation of air, other gases mainly come from oxygen, water vapor and other impurity gases in the air, and the proportion of other gas components that permeate from the cathode inlet to the anode inlet is very low, which can be approximately ignored in engineering. The control unit brings the volume of nitrogen in the cathode inlet and the hydrogen inlet pressure into the stack gas density calculation formula to calculate the density of the gas in the stack. The stack gas density calculation formula is a mathematical formula for calculating the density of the gas in the stack.

[0076] S203, the control unit determines the required exhaust volume according to the current value of the converter connected to the fuel cell stack and the current integral value within a preset time period.

[0077] The current integral value refers to the current of the converter connected to the battery stack obtained by integrating the sampled current. The current of the converter connected to the battery stack is sampled once at each preset time interval. The current value of the converter connected to the battery stack within the preset time period is integrated to obtain the current integral value within the preset time period.

[0078] The required exhaust volume refers to the volume of gas that the fuel cell stack needs to exhaust at the outlet of the stack. The control unit determines the required exhaust volume based on the current value of the converter connected to the stack and the current integral value within the preset time period. When the fuel cell is working, hydrogen and oxygen undergo an electrochemical reaction to generate water. The oxygen in the air is consumed in large quantities in this process, and the nitrogen in the air is a low-activity gas, so it simply flows through the fuel cell system without any reaction. However, since the hydrogen at the anode inlet permeates the proton exchange membrane to become hydrogen ions, the pressure at the anode inlet is reduced, and some nitrogen at the cathode inlet will pass through the proton exchange membrane into the anode due to the pressure difference. As the fuel cell works, more and more nitrogen accumulates at the anode inlet. If the nitrogen accumulated in the anode inlet is not discharged regularly, the proportion of nitrogen in the mixed gas at the anode inlet will become higher and higher, which will eventually cause the fuel cell system to be fuel-starved and stop working.

[0079] S204: The control unit determines the exhaust start time based on the density of the gas in the fuel cell stack and the required exhaust volume.

[0080] The exhaust opening time refers to the length of time the exhaust valve is open during an exhaust cycle. During the exhaust cycle, the exhaust valve is open for a certain period of time and closed for the rest of the time. The control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the required exhaust volume.

[0081] S205: The control unit controls the opening and closing of the exhaust valve based on the exhaust opening time.

[0082] The exhaust valve is connected to the gas outlet of the fuel cell stack. When the exhaust valve is open, the post-reaction gas in the stack is discharged through the gas outlet. When the exhaust valve is closed, the post-reaction gas in the stack cannot be discharged through the gas outlet. The control unit can discharge the nitrogen accumulated in the stack through reasonable exhaust valve opening time control, while avoiding excessive hydrogen discharge, which causes fuel waste and safety problems.

[0083] In the above exhaust control method, the density of the gas in the stack is determined by the volume of nitrogen at the cathode inlet and the hydrogen inlet pressure at the anode inlet obtained by the control unit; the required exhaust volume is determined according to the current value of the converter connected to the stack and the current integral value within a preset time period obtained by the control unit; the exhaust valve is opened and closed based on the exhaust opening time determined by the density of the gas in the stack and the required exhaust volume. This exhaust control method can dynamically determine the exhaust opening time of the exhaust valve according to the actual situation of the nitrogen volume at the air inlet of the fuel cell stack, the hydrogen inlet pressure and the converter current value, thereby improving the exhaust control efficiency of the exhaust valve.

[0084] In one embodiment, Figure 3As shown, the control unit determines the density of the gas in the fuel cell stack according to the volume of nitrogen in the cathode inlet and the hydrogen inlet pressure, including:

[0085] S302, the control unit obtains the gas temperature in the fuel cell stack.

[0086] The gas temperature in the fuel cell stack is measured by a temperature sensor deployed in the fuel cell stack. The control unit is connected to the temperature sensor to obtain the gas temperature in the fuel cell stack.

[0087] S304, the control unit determines the volume of hydrogen to be input into the anode inlet according to the volume of nitrogen in the cathode inlet.

[0088] The gas in the battery stack mainly includes hydrogen and nitrogen, and the volumes of hydrogen and nitrogen have a fixed ratio. The control unit multiplies the volume of nitrogen in the cathode inlet by the volume ratio of hydrogen and nitrogen to obtain the volume of hydrogen to be input into the anode inlet. In some embodiments, the volume ratio of hydrogen and nitrogen is a fixed value between 7:3 and 9:1.

[0089] S306, the control unit determines the density of the gas in the fuel cell stack based on the volume of nitrogen, the volume of hydrogen, the gas constant of nitrogen, the gas constant of hydrogen, the gas temperature in the fuel cell stack, and the hydrogen inlet pressure.

[0090] The gas constant refers to the ideal gas constant, which is a constant that characterizes the thermodynamic properties of an ideal gas. Each gas has a fixed gas constant. For example, the gas constant of hydrogen is 4124.2 J / (kg*K), and the gas constant of nitrogen is 296.8 J / (kg*K).

[0091] The control unit determines the density of the gas in the fuel cell stack based on the volume of the nitrogen, the volume of the hydrogen, the gas constant of the nitrogen, the gas constant of the hydrogen, the gas temperature in the fuel cell stack, and the hydrogen inlet pressure.

[0092] Specifically, the control unit divides the volume of nitrogen by the sum of the volume of nitrogen and the volume of hydrogen to obtain a first ratio of nitrogen gas in the fuel cell stack. The control unit divides the volume of hydrogen by the sum of the volume of nitrogen and the volume of hydrogen to obtain a second ratio of hydrogen gas in the fuel cell stack.

[0093] The gas constant of the gas in the stack is the gas constant of nitrogen multiplied by the first ratio plus the gas constant of hydrogen multiplied by the second ratio.

[0094] The control unit brings the gas constant of the gas in the stack, the gas temperature in the stack, and the hydrogen inlet pressure into the density calculation formula of the stack gas to calculate the density of the gas in the stack. The stack gas density calculation formula is as follows: ρ = P / RgT, where ρ represents the stack gas density, P represents the hydrogen inlet pressure, Rg represents the gas constant of the gas in the stack, and T represents the gas temperature in the stack.

[0095] Since 1 / ρ=RT / PM, Rg=R / M, therefore, ρ=P / RgT. Among them, R is the universal gas constant, which does not change with the molecular weight of the gas, R=8.314472J / (K·mol). M is the molar mass of the gas in the battery stack.

[0096] In this embodiment, the gas constant of the gas in the stack is determined by the volume of nitrogen, the volume of hydrogen, the gas constant of nitrogen, and the gas constant of hydrogen, and then the gas constant of the gas in the stack, the gas temperature in the stack, and the hydrogen inlet pressure are brought into the density calculation formula of the stack gas to calculate the density of the gas in the stack. This method of calculating the density of the gas in the stack based on the actual data of the volume, temperature, and pressure of the gas in the stack can obtain the actual density of the gas in the stack, which is conducive to improving the exhaust control efficiency of the exhaust valve.

[0097] In one embodiment, the control unit determines the required exhaust volume based on the current value of the inverter connected to the fuel cell stack and the current integral value within a preset time period, including: the control unit looks up the table to obtain the corresponding first exhaust volume based on the current value of the inverter connected to the fuel cell stack and the first mapping relationship; the control unit multiplies the first exhaust volume by the current integral value within the preset time period to determine the required exhaust volume.

[0098] The first exhaust volume is used to characterize the exhaust volume in a single current time period corresponding to the low-end current value of the converter. The first mapping relationship is used to characterize the corresponding relationship between the current value of the converter connected to the stack and the first exhaust volume. The first mapping relationship is an empirical value obtained through historical experiments.

[0099] The control unit looks up a table to obtain a corresponding first exhaust volume according to the current value of the converter connected to the battery stack and the first mapping relationship, and then multiplies the first exhaust volume by the current integral value within a preset time period to determine the required exhaust volume.

[0100] In this embodiment, the first exhaust volume corresponding to the current value of the inverter connected to the battery stack is obtained by looking up the table. The first exhaust volume can be quickly obtained by looking up the table, which is beneficial to improving the efficiency of determining the required exhaust volume, and further improving the efficiency of the exhaust control of the exhaust valve.

[0101] In one embodiment, Figure 4As shown, the control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the required exhaust volume, including:

[0102] S402, the control unit looks up a table to obtain a corresponding correction coefficient according to the gas temperature and the second mapping relationship.

[0103] Among them, the correction coefficient is a correction parameter for the required exhaust volume. For gas, the temperature and pressure of the gas have a greater impact on the gas flow rate. Since the circulating hydrogen pressure can be considered constant, the main factor affecting the flow rate is temperature. The second mapping relationship is used to characterize the corresponding relationship between gas temperature and correction coefficient. The second mapping relationship is an empirical value obtained through historical experiments.

[0104] S404: The control unit multiplies the required exhaust volume by the correction coefficient to obtain a corrected required exhaust volume.

[0105] The control unit multiplies the required exhaust volume by the correction coefficient to obtain the corrected required exhaust volume.

[0106] S406: The control unit determines the exhaust start time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume.

[0107] The control unit calculates the exhaust opening time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume through the exhaust opening time calculation formula. The exhaust opening time calculation formula is used to calculate the exhaust opening time.

[0108] In this embodiment, the correction coefficient corresponding to the gas temperature is obtained by looking up the table, and the correction coefficient is multiplied by the required exhaust volume to obtain the corrected required exhaust volume, and the exhaust opening time is determined based on the corrected required exhaust volume and the gas density. This method of determining the exhaust opening time after correcting the required exhaust volume can obtain a more accurate required exhaust volume, reduce the error in the calculation of the exhaust opening time, and is conducive to improving the exhaust control efficiency of the exhaust valve.

[0109] In one embodiment, Figure 5 As shown, the control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume, including:

[0110] S502, the control unit obtains the exhaust hole diameter and the atmospheric pressure.

[0111] The exhaust hole diameter refers to the exhaust hole diameter of the exhaust valve. The exhaust hole diameter can be obtained from the technical manual of the exhaust valve provided by the supplier. The atmospheric pressure refers to the atmospheric pressure per unit area. The control unit obtains the exhaust hole diameter and the atmospheric pressure.

[0112] S504, the control unit obtains a flow coefficient according to the isentropic index, the atmospheric pressure and the hydrogen inlet pressure.

[0113] Among them, the isentropic index is also called the adiabatic index. If the flowing material does not exchange heat with the outside world during the state change process, the product of the fluid pressure and the nth power of the specific volume is a constant, and n is the isentropic index. The control unit brings the isentropic index, atmospheric pressure, and hydrogen inlet pressure into the flow coefficient calculation formula to obtain the flow coefficient. The flow coefficient calculation formula is:

[0114]

[0115] Among them, ψ is the flow coefficient, k is the isentropic index, p is the atmospheric pressure, and p0 is the hydrogen inlet pressure.

[0116] S506, the control unit determines the mass flow rate of the gas in the fuel cell stack according to the flow coefficient, the hydrogen inlet pressure, the corrected required exhaust volume and the exhaust hole diameter.

[0117] The control unit calculates the exhaust hole area according to the exhaust hole diameter. The control unit brings the exhaust hole area, flow coefficient, hydrogen inlet pressure, and corrected required exhaust volume into the fuel cell gas mass flow calculation formula to calculate the mass flow of the gas in the fuel cell. The fuel cell gas mass flow calculation formula is:

[0118]

[0119] Among them, m f It represents the gas mass flow rate of the fuel cell stack, v0 represents the required exhaust volume after correction, and A represents the exhaust hole area.

[0120] S508, the control unit determines the exhaust start time according to the density of the gas in the fuel cell stack, the corrected required exhaust volume and the mass flow rate of the gas in the fuel cell stack.

[0121] The control unit brings the density of the gas in the fuel cell stack, the corrected required exhaust volume and the mass flow rate of the gas in the fuel cell stack into the exhaust opening time calculation formula to calculate the exhaust opening time. The exhaust opening time calculation formula is:

[0122]

[0123] Wherein, t represents the exhaust opening time.

[0124] In this embodiment, the control unit obtains the flow coefficient according to the isentropic index, the atmospheric pressure and the hydrogen inlet pressure, and determines the mass flow of the gas in the fuel cell stack according to the flow coefficient, the hydrogen inlet pressure, the corrected required exhaust volume and the exhaust hole diameter, and then determines the exhaust opening time. This exhaust opening time determination method can be calculated according to the actual pressure data of the gas in the fuel cell stack, the required exhaust volume and the actual size of the exhaust hole, which is conducive to improving the exhaust control efficiency of the exhaust valve.

[0125] In one embodiment, Figure 6 As shown, the control unit controls the opening and closing of the exhaust valve based on the exhaust opening time, including:

[0126] S602, the control unit obtains the hydrogen concentration change rate.

[0127] The hydrogen concentration change rate refers to the hydrogen concentration change rate at the anode inlet of the fuel cell stack. The control unit obtains the hydrogen concentration change rate.

[0128] S604: The control unit determines a corresponding exhaust cycle according to the hydrogen concentration change rate and the third mapping relationship.

[0129] The third mapping relationship is used to characterize the corresponding relationship between the hydrogen concentration change rate and the exhaust cycle. The third mapping relationship is an empirical value obtained from historical experiments. The control unit determines the exhaust cycle corresponding to the hydrogen concentration change rate according to the hydrogen concentration change rate and the third mapping relationship.

[0130] S606: The control unit controls the opening and closing of the exhaust valve based on the exhaust opening time and the exhaust cycle.

[0131] The exhaust cycle includes an exhaust opening time and an exhaust closing time. During the exhaust starting time, the control unit controls the exhaust valve to open so as to exhaust. During the exhaust closing time, the control unit controls the exhaust valve to close.

[0132] In this embodiment, by determining the exhaust cycle corresponding to the hydrogen concentration change rate, the exhaust valve is opened and closed based on the exhaust opening time and the exhaust cycle. The exhaust cycle is determined based on the hydrogen concentration change rate, which is beneficial to improving the exhaust efficiency of the exhaust valve.

[0133] To explain the exhaust control method and effect in this solution in detail, a most detailed embodiment is described below:

[0134] Exhaust control methods are applied to fuel cells, such as Figure 7The figure shows the schematic diagram of the structure of the exhaust control of the fuel cell stack. The fuel cell includes a stack, an exhaust valve and a control unit. The stack includes an air inlet and an air outlet. The air inlet includes an anode inlet and a cathode inlet. The anode inlet is used to input hydrogen, and the cathode inlet is used to input air. The exhaust valve is connected to the air outlet. The air outlet and the exhaust valve are used to discharge the gas to be discharged generated by the stack. The control unit is connected to the exhaust valve and the air inlet respectively. Figure 8 Shown is a schematic diagram of the reaction principle of a fuel cell.

[0135] The control unit obtains the volume of nitrogen at the cathode inlet, the current value of the inverter connected to the stack, and the hydrogen inlet pressure at the anode inlet. The control unit obtains the gas temperature in the stack and determines the volume of hydrogen to be input into the anode inlet according to the volume of nitrogen at the cathode inlet. Based on the volume of nitrogen, the volume of hydrogen, the gas constant of nitrogen, the gas constant of hydrogen, the gas temperature in the stack, and the hydrogen inlet pressure, the density of the gas in the stack is determined by the stack gas density calculation formula. The stack gas density calculation formula is as follows:

[0136] ρ=P / RgT

[0137] Wherein, ρ represents the gas density of the stack, P represents the hydrogen inlet pressure, Rg represents the gas constant of the gas in the stack, and T represents the gas temperature in the stack. For example, the gas constant of hydrogen is: 4124.2 J / (kg*K), and the gas constant of nitrogen is: 296.8 J / (kg*K). The ratio of hydrogen to nitrogen in the stack gas is 7:3. The gas density of the stack is: 4124.2*70%+296.8J*30%=2975.98J / (kg*K).

[0138] The control unit obtains the corresponding first exhaust volume by looking up the table according to the current value of the converter connected to the stack and the first mapping relationship. The control unit multiplies the first exhaust volume by the current integral value within the preset time period to determine the required exhaust volume. The control unit obtains the corresponding correction coefficient by looking up the table according to the gas temperature and the second mapping relationship. The control unit multiplies the correction coefficient by the required exhaust volume to obtain the corrected required exhaust volume. Exemplarily, the current value of the converter connected to the stack is 150A. According to the first mapping relationship, the first exhaust volume is 1.5L / Ah, and the current integral value within the preset time period is 0.5Ah. The required exhaust volume is 1.5L / Ah*0.5Ah=0.75L. When the gas temperature is 25 degrees Celsius, according to the second mapping relationship, the correction coefficient is 1, and the corrected required exhaust volume is 0.75L*1=0.75L.

[0139] The control unit obtains the exhaust hole diameter and atmospheric pressure, and obtains the flow coefficient according to the isentropic index, atmospheric pressure and hydrogen inlet pressure. The flow coefficient calculation formula is:

[0140]

[0141] Among them, ψ is the flow coefficient, k is the isentropic index, p is the atmospheric pressure, and p0 is the hydrogen inlet pressure.

[0142] The control unit determines the mass flow rate of the gas in the fuel cell stack based on the flow coefficient, hydrogen inlet pressure, the corrected required exhaust volume, and the exhaust hole diameter. The calculation formula for the fuel cell stack gas mass flow rate is:

[0143]

[0144] Among them, m f It represents the gas mass flow rate of the fuel cell stack, v0 represents the required exhaust volume after correction, and A represents the exhaust hole area.

[0145] The control unit determines the exhaust opening time according to the density of the gas in the fuel cell, the corrected required exhaust volume and the mass flow rate of the gas in the fuel cell. The exhaust opening time calculation formula is:

[0146]

[0147] Wherein, t represents the exhaust opening time.

[0148] The control unit obtains the hydrogen concentration change rate, and determines the corresponding exhaust cycle according to the hydrogen concentration change rate and the third mapping relationship. For example, when the hydrogen concentration change rate is 5%, according to the third mapping relationship, the corresponding exhaust cycle is 18s.

[0149] The control unit controls the exhaust valve to open and close based on the exhaust opening time and the exhaust cycle. The exhaust cycle includes the exhaust opening time and the exhaust closing time. During the exhaust start time, the control unit controls the exhaust valve to open so as to exhaust. During the exhaust closing time, the control unit controls the exhaust valve to close.

[0150] The above-mentioned exhaust control method determines the density of the gas in the stack by the volume of nitrogen at the cathode inlet and the hydrogen inlet pressure at the anode inlet obtained by the control unit; determines the required exhaust volume according to the current value of the converter connected to the stack and the current integral value within a preset time period obtained by the control unit; and controls the opening and closing of the exhaust valve based on the exhaust opening time determined by the density of the gas in the stack and the required exhaust volume. This exhaust control method can dynamically determine the exhaust opening time of the exhaust valve according to the actual situation of the nitrogen volume at the air inlet of the fuel cell stack, the hydrogen inlet pressure and the converter current value, thereby improving the exhaust control efficiency of the exhaust valve. By optimizing the exhaust opening time and exhaust cycle of the exhaust valve, the hydrogen consumption can be greatly saved. At the same time, it can reduce the number of fuel starvation caused by excessive nitrogen concentration.

[0151] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0152] Based on the same inventive concept, the embodiment of the present application also provides an exhaust control device for implementing the exhaust control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more exhaust control device embodiments provided below can refer to the limitations of the exhaust control method above, and will not be repeated here.

[0153] In one embodiment, Fig. 9 As shown, an exhaust control device 100 is provided, and the exhaust control device 100 includes: an acquisition module 110, a density determination module 120, an exhaust volume determination module 130, a time determination module 140 and a control module 150, wherein:

[0154] The acquisition module 110 is used for the control unit to acquire the volume of nitrogen at the cathode inlet, the current value of the inverter connected to the fuel cell stack, and the hydrogen inlet pressure at the anode inlet.

[0155] The density determination module 120 is used for the control unit to determine the density of the gas in the fuel cell stack according to the volume of nitrogen in the cathode inlet and the hydrogen inlet pressure.

[0156] The exhaust volume determination module 130 is used for the control unit to determine the required exhaust volume according to the current value of the inverter connected to the fuel cell stack and the current integral value within a preset time period.

[0157] The time determination module 140 is used for the control unit to determine the exhaust start time based on the density of the gas in the fuel cell stack and the required exhaust volume.

[0158] The control module 150 is used to control the exhaust valve to be opened and closed based on the exhaust opening time.

[0159] The above-mentioned exhaust control device determines the density of the gas in the stack by the volume of nitrogen in the cathode inlet and the hydrogen inlet pressure at the anode inlet obtained by the control unit; determines the required exhaust volume according to the current value of the converter connected to the stack and the current integral value within a preset time period obtained by the control unit; and controls the opening and closing of the exhaust valve based on the exhaust opening time determined by the density of the gas in the stack and the required exhaust volume. This exhaust control method can dynamically determine the exhaust opening time of the exhaust valve according to the actual situation of the nitrogen volume at the air inlet of the fuel cell stack, the hydrogen inlet pressure and the converter current value, thereby improving the exhaust control efficiency of the exhaust valve.

[0160] In one embodiment, in terms of the control unit determining the density of the gas in the fuel cell stack based on the volume of nitrogen in the cathode inlet and the hydrogen inlet pressure, the density determination module 120 is also used for: the control unit obtains the gas temperature in the fuel cell stack; the control unit determines the volume of hydrogen to be input into the anode inlet based on the volume of nitrogen in the cathode inlet; the control unit determines the density of the gas in the fuel cell stack based on the volume of nitrogen, the volume of hydrogen, the gas constant of nitrogen, the gas constant of hydrogen, the gas temperature in the fuel cell stack and the hydrogen inlet pressure.

[0161] In one embodiment, in terms of the control unit determining the required exhaust volume based on the current value of the inverter connected to the fuel cell stack and the current integral value within a preset time period, the exhaust volume determination module 130 is also used for: the control unit looks up the table to obtain the corresponding first exhaust volume based on the current value of the inverter connected to the fuel cell stack and the first mapping relationship; the control unit multiplies the first exhaust volume by the current integral value within the preset time period to determine the required exhaust volume.

[0162] In one embodiment, in terms of the control unit determining the exhaust opening time based on the density of the gas in the fuel cell stack and the required exhaust volume, the time determination module 140 is also used for: the control unit looks up the table to obtain the corresponding correction coefficient based on the gas temperature and the second mapping relationship; the control unit multiplies the correction coefficient by the required exhaust volume to obtain the corrected required exhaust volume; the control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume.

[0163] In one embodiment, in terms of the control unit determining the exhaust opening time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume, the time determination module 140 is also used for: the control unit obtains the exhaust hole diameter and the atmospheric pressure; the control unit obtains the flow coefficient based on the isentropic index, the atmospheric pressure and the hydrogen inlet pressure; the control unit determines the mass flow rate of the gas in the fuel cell stack based on the flow coefficient, the hydrogen inlet pressure, the corrected required exhaust volume and the exhaust hole diameter; the control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack, the corrected required exhaust volume and the mass flow rate of the gas in the fuel cell stack.

[0164] In one embodiment, the control unit controls the opening and closing of the exhaust valve based on the exhaust opening time, and the control module 150 is also used for: the control unit obtains the hydrogen concentration change rate; the control unit determines the corresponding exhaust cycle according to the hydrogen concentration change rate and the third mapping relationship; the control unit controls the opening and closing of the exhaust valve based on the exhaust opening time and the exhaust cycle.

[0165] Each module in the above exhaust control device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0166] In one embodiment, a fuel cell is provided. The fuel cell includes a stack, an exhaust valve, and a control unit, the stack includes an air inlet and an air outlet, the air inlet includes an anode inlet and a cathode inlet, the anode inlet is used to input hydrogen, the cathode inlet is used to input air, the exhaust valve is connected to the air outlet, the air outlet and the exhaust valve are used to discharge the gas to be discharged generated by the stack, the control unit is respectively connected to the exhaust valve and the air inlet, and the control unit is used to execute the steps of the exhaust control method.

[0167] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Fig.10 As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface, the display unit and the input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, an exhaust control method is implemented.

[0168] Those skilled in the art will understand that Fig.10 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0169] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0170] The control unit obtains the volume of nitrogen at the cathode inlet, the current value of the inverter connected to the fuel cell stack, and the hydrogen inlet pressure at the anode inlet; the control unit determines the density of the gas in the fuel cell stack according to the volume of nitrogen at the cathode inlet and the hydrogen inlet pressure; the control unit determines the required exhaust volume according to the current value of the inverter connected to the fuel cell stack and the current integral value within a preset time period; the control unit determines the exhaust opening time based on the gas density in the fuel cell stack and the required exhaust volume; the control unit controls the opening and closing of the exhaust valve based on the exhaust opening time.

[0171] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0172] The control unit obtains the gas temperature in the fuel cell stack; the control unit determines the volume of hydrogen to be input into the anode inlet according to the volume of nitrogen in the cathode inlet; the control unit determines the density of the gas in the fuel cell stack based on the volume of nitrogen, the volume of hydrogen, the gas constant of nitrogen, the gas constant of hydrogen, the gas temperature in the fuel cell stack and the hydrogen inlet pressure.

[0173] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0174] The control unit obtains the corresponding first exhaust volume by looking up the table according to the current value of the converter connected to the battery stack and the first mapping relationship; the control unit multiplies the first exhaust volume by the current integral value within a preset time period to determine the required exhaust volume.

[0175] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0176] The control unit obtains a corresponding correction coefficient by looking up a table according to the gas temperature and the second mapping relationship; the control unit multiplies the correction coefficient by the required exhaust volume to obtain a corrected required exhaust volume; the control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume.

[0177] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0178] The control unit obtains the exhaust hole diameter and the atmospheric pressure; the control unit obtains the flow coefficient according to the isentropic index, the atmospheric pressure and the hydrogen inlet pressure; the control unit determines the mass flow rate of the gas in the fuel cell stack according to the flow coefficient, the hydrogen inlet pressure, the corrected required exhaust volume and the exhaust hole diameter; the control unit determines the exhaust opening time according to the density of the gas in the fuel cell stack, the corrected required exhaust volume and the mass flow rate of the gas in the fuel cell stack.

[0179] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0180] The control unit obtains the hydrogen concentration change rate; the control unit determines the corresponding exhaust cycle according to the hydrogen concentration change rate and the third mapping relationship; the control unit controls the opening and closing of the exhaust valve based on the exhaust opening time and the exhaust cycle.

[0181] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0182] The control unit obtains the volume of nitrogen at the cathode inlet, the current value of the inverter connected to the fuel cell stack, and the hydrogen inlet pressure at the anode inlet; the control unit determines the density of the gas in the fuel cell stack according to the volume of nitrogen at the cathode inlet and the hydrogen inlet pressure; the control unit determines the required exhaust volume according to the current value of the inverter connected to the fuel cell stack and the current integral value within a preset time period; the control unit determines the exhaust opening time based on the gas density in the fuel cell stack and the required exhaust volume; the control unit controls the opening and closing of the exhaust valve based on the exhaust opening time.

[0183] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0184] The control unit obtains the gas temperature in the fuel cell stack; the control unit determines the volume of hydrogen to be input into the anode inlet according to the volume of nitrogen in the cathode inlet; the control unit determines the density of the gas in the fuel cell stack based on the volume of nitrogen, the volume of hydrogen, the gas constant of nitrogen, the gas constant of hydrogen, the gas temperature in the fuel cell stack and the hydrogen inlet pressure.

[0185] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0186] The control unit obtains the corresponding first exhaust volume by looking up the table according to the current value of the converter connected to the battery stack and the first mapping relationship; the control unit multiplies the first exhaust volume by the current integral value within a preset time period to determine the required exhaust volume.

[0187] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0188] The control unit obtains a corresponding correction coefficient by looking up a table according to the gas temperature and the second mapping relationship; the control unit multiplies the correction coefficient by the required exhaust volume to obtain a corrected required exhaust volume; the control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume.

[0189] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0190] The control unit obtains the exhaust hole diameter and the atmospheric pressure; the control unit obtains the flow coefficient according to the isentropic index, the atmospheric pressure and the hydrogen inlet pressure; the control unit determines the mass flow rate of the gas in the fuel cell stack according to the flow coefficient, the hydrogen inlet pressure, the corrected required exhaust volume and the exhaust hole diameter; the control unit determines the exhaust opening time according to the density of the gas in the fuel cell stack, the corrected required exhaust volume and the mass flow rate of the gas in the fuel cell stack.

[0191] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0192] The control unit obtains the hydrogen concentration change rate; the control unit determines the corresponding exhaust cycle according to the hydrogen concentration change rate and the third mapping relationship; the control unit controls the opening and closing of the exhaust valve based on the exhaust opening time and the exhaust cycle.

[0193] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0194] The control unit obtains the volume of nitrogen at the cathode inlet, the current value of the inverter connected to the fuel cell stack, and the hydrogen inlet pressure at the anode inlet; the control unit determines the density of the gas in the fuel cell stack according to the volume of nitrogen at the cathode inlet and the hydrogen inlet pressure; the control unit determines the required exhaust volume according to the current value of the inverter connected to the fuel cell stack and the current integral value within a preset time period; the control unit determines the exhaust opening time based on the gas density in the fuel cell stack and the required exhaust volume; the control unit controls the opening and closing of the exhaust valve based on the exhaust opening time.

[0195] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0196] The control unit obtains the gas temperature in the fuel cell stack; the control unit determines the volume of hydrogen to be input into the anode inlet according to the volume of nitrogen in the cathode inlet; the control unit determines the density of the gas in the fuel cell stack based on the volume of nitrogen, the volume of hydrogen, the gas constant of nitrogen, the gas constant of hydrogen, the gas temperature in the fuel cell stack and the hydrogen inlet pressure.

[0197] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0198] The control unit obtains the corresponding first exhaust volume by looking up the table according to the current value of the converter connected to the battery stack and the first mapping relationship; the control unit multiplies the first exhaust volume by the current integral value within a preset time period to determine the required exhaust volume.

[0199] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0200] The control unit obtains a corresponding correction coefficient by looking up a table according to the gas temperature and the second mapping relationship; the control unit multiplies the correction coefficient by the required exhaust volume to obtain a corrected required exhaust volume; the control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume.

[0201] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0202] The control unit obtains the exhaust hole diameter and the atmospheric pressure; the control unit obtains the flow coefficient according to the isentropic index, the atmospheric pressure and the hydrogen inlet pressure; the control unit determines the mass flow rate of the gas in the fuel cell stack according to the flow coefficient, the hydrogen inlet pressure, the corrected required exhaust volume and the exhaust hole diameter; the control unit determines the exhaust opening time according to the density of the gas in the fuel cell stack, the corrected required exhaust volume and the mass flow rate of the gas in the fuel cell stack.

[0203] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0204] The control unit obtains the hydrogen concentration change rate; the control unit determines the corresponding exhaust cycle according to the hydrogen concentration change rate and the third mapping relationship; the control unit controls the opening and closing of the exhaust valve based on the exhaust opening time and the exhaust cycle.

[0205] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0206] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0207] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0208] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An exhaust control method, characterized in that: Applied to a fuel cell, the fuel cell comprises a stack, an exhaust valve and a control unit, the stack comprises an air inlet and an air outlet, the air inlet comprises an anode inlet and a cathode inlet, the anode inlet is used to input hydrogen, the cathode inlet is used to input air, the exhaust valve is connected to the air outlet, the air outlet and the exhaust valve are used to discharge the gas to be discharged generated by the stack, the control unit is respectively connected to the exhaust valve and the air inlet, and the method comprises: The control unit obtains the volume of nitrogen in the cathode inlet, the current value of the inverter connected to the stack, and the hydrogen inlet pressure at the anode inlet; The control unit determines the density of the gas in the fuel cell stack according to the volume of the nitrogen in the cathode inlet and the hydrogen inlet pressure; The control unit determines the required exhaust volume according to the current value of the converter connected to the fuel cell stack and the current integral value within a preset time period; The control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the required exhaust volume; The control unit controls the opening and closing of the exhaust valve based on the exhaust opening time; The control unit determines the required exhaust volume according to the current value of the converter connected to the battery stack and the current integral value within a preset time period, including: The control unit obtains a corresponding first exhaust volume by looking up a table according to a current value of the converter connected to the battery stack and a first mapping relationship; The control unit multiplies the first exhaust volume by an integrated value of current within a preset time period to determine a required exhaust volume.

2. The method according to claim 1, characterized in that The control unit determines the density of the gas in the fuel cell stack according to the volume of the nitrogen in the cathode inlet and the hydrogen inlet pressure, including: The control unit obtains the gas temperature in the fuel cell stack; The control unit determines the volume of hydrogen to be input into the anode inlet according to the volume of nitrogen in the cathode inlet; The control unit determines the density of the gas in the fuel cell stack based on the volume of the nitrogen, the volume of the hydrogen, the gas constant of the nitrogen, the gas constant of the hydrogen, the gas temperature in the fuel cell stack, and the hydrogen inlet pressure.

3. The method according to claim 2, characterized in that The control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the required exhaust volume, including: The control unit obtains a corresponding correction coefficient by looking up a table according to the gas temperature and a second mapping relationship; The control unit multiplies the correction coefficient by the required exhaust volume to obtain a corrected required exhaust volume; The control unit determines an exhaust opening time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume.

4. The method according to claim 3, characterized in that The control unit determines the exhaust opening time based on the density of the gas in the fuel cell stack and the corrected required exhaust volume, including: The control unit obtains the exhaust hole diameter and the atmospheric pressure; The control unit obtains a flow coefficient according to the isentropic index, the atmospheric pressure and the hydrogen inlet pressure; The control unit determines the mass flow rate of the gas in the fuel cell stack according to the flow coefficient, the hydrogen inlet pressure, the corrected required exhaust volume and the exhaust hole diameter; The control unit determines the exhaust opening time according to the density of the gas in the fuel cell stack, the corrected required exhaust volume and the mass flow rate of the gas in the fuel cell stack.

5. The method according to claim 1, characterized in that The control unit controls the exhaust valve to open and close based on the exhaust opening time, including: The control unit obtains the hydrogen concentration change rate; The control unit determines a corresponding exhaust cycle according to the hydrogen concentration change rate and the third mapping relationship; The control unit controls the opening and closing of the exhaust valve based on the exhaust opening time and the exhaust cycle.

6. An exhaust control device, characterized in that: The device comprises: An acquisition module is used to control the control unit to acquire the volume of nitrogen at the cathode inlet, the current value of the converter connected to the stack, and the hydrogen inlet pressure at the anode inlet; A density determination module, used for the control unit to determine the density of the gas in the fuel cell stack according to the volume of nitrogen in the cathode inlet and the hydrogen inlet pressure; An exhaust volume determination module, used for the control unit to determine the required exhaust volume according to the current value of the converter connected to the battery stack and the current integral value within a preset time period; A time determination module, used for the control unit to determine the exhaust start time based on the density of the gas in the fuel cell stack and the required exhaust volume; A control module, used for the control unit to control the opening and closing of the exhaust valve based on the exhaust opening time; The exhaust volume determination module is also used for the control unit to look up the table to obtain the corresponding first exhaust volume according to the current value of the inverter connected to the battery stack and the first mapping relationship; the control unit multiplies the first exhaust volume with the current integral value within a preset time period to determine the required exhaust volume.

7. A fuel cell, characterized in that: The fuel cell includes a fuel cell stack, an exhaust valve and a control unit. The fuel cell stack includes an air inlet and an air outlet. The air inlet includes an anode inlet and a cathode inlet. The anode inlet is used to input hydrogen, and the cathode inlet is used to input air. The exhaust valve is connected to the air outlet. The air outlet and the exhaust valve are used to discharge the gas to be discharged generated by the fuel cell stack. The control unit is respectively connected to the exhaust valve and the air inlet. The control unit is used to perform the steps of the method described in any one of claims 1 to 5.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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