Oxygen supply control method, device and equipment of air supply system, medium and product

Abstract

The invention relates to an oxygen supply control method, device and equipment of an air supply system, a medium and a product. The method comprises the steps that the current working condition of a fuel cell engine is determined according to the obtained current output power and target power of a vehicle, the first target opening degree of an air inlet combination valve is determined, and the target rotating speed of an air compressor and the second target opening degree of a back pressure valve are determined based on the first target opening degree; determining a target opening and closing period of the drain valve and a third target opening degree of the bypass valve according to the current working condition; and the air inlet combination valve, the air compressor, the back pressure valve, the drainage valve and the bypass valve are controlled according to the first target opening degree, the target rotating speed, the second target opening degree, the target opening and closing period and the third target opening degree. Therefore, by controlling the oxygen amount supplied by the air supply system according to different working conditions, the load increasing and reducing efficiency of engine power is ensured, the utilization rate of oxygen and a catalyst is improved, the efficiency of a fuel cell engine is improved, and the cost of a fuel cell stack is integrally reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to an oxygen supply control method, device, equipment, medium and product of an air supply system. Background Art

[0002] A fuel cell engine is an engine system that converts chemical energy of hydrogen and oxygen into electrical energy through an electrochemical reaction. The air supply system of a fuel cell engine is one of its key components. It is mainly responsible for filtering, humidifying, and regulating the pressure of the air entering the fuel cell stack to ensure that the temperature, humidity, pressure, and flow rate on the cathode side of the fuel cell stack are within the optimal range. At the same time, the air supply system is also particularly important when increasing engine power.

[0003] In the related art, in order to increase the chemical reaction rate of the fuel cell engine, the engine power is usually increased by increasing the operating speed of the air supply system, increasing the operating pressure of the air and the flow metering ratio (the ratio of the actual flow to the theoretical required flow).

[0004] However, in the prior art, when the fuel cell engine is running at low power, the high air flow metering ratio makes the fuel cell membrane electrode too dry, which is not conducive to the chemical reaction of the fuel cell; at the same time, when the fuel cell engine is running at high power, the air supply system operation rate increases, the air compressor parasitic power increases significantly, and the overall efficiency of the fuel cell engine decreases. In addition, a large amount of oxygen in the exhaust gas is discharged without being used, resulting in a waste of energy, which needs to be solved urgently. Summary of the invention

[0005] The present invention provides an oxygen supply control method, device, equipment, medium and product for an air supply system to solve the problem in the related art that when increasing the air operating pressure and flow metering ratio, the air supply amount is not adjusted according to different working conditions, resulting in excessive drying of the fuel cell membrane motor or excessive parasitic power of the air compressor. The oxygen amount supplied by the air supply system is controlled according to different working conditions to ensure the load-up and load-down efficiency of the engine power, improve the utilization rate of oxygen and catalyst, enhance the efficiency of the fuel cell engine, and reduce the overall cost of the fuel cell stack.

[0006] To achieve the above-mentioned purpose, the first embodiment of the present invention proposes an oxygen supply control method for an air supply system, wherein an intake combination valve, an oxygen separation membrane and a gas-liquid separator are arranged between an intercooler and a humidifier of the air supply system, the input end of the intake combination valve is connected to the output end of the intercooler, the input end of the oxygen separation membrane is connected to the bypass outlet of the intake combination valve, the output end of the oxygen separation membrane is connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is respectively connected to the main outlet of the intake combination valve and the input end of the humidification component, wherein the method comprises the following steps:

[0007] Obtaining the current output power and target power of the fuel cell engine;

[0008] Determining a current operating condition of the fuel cell engine according to the current output power and the target power, and determining a first target opening of the intake combination valve according to the current operating condition, and determining a target speed of an air compressor of the air supply system and a second target opening of a back pressure valve based on the first target opening, and determining a target opening and closing period of the drain valve and a third target opening of a bypass valve according to the current operating condition;

[0009] The intake combination valve is controlled according to the first target opening, the air compressor is controlled according to the target speed, the back pressure valve is controlled according to the second target opening, the drain valve is controlled according to the target opening and closing cycle, and the bypass valve is controlled according to the third target opening.

[0010] According to one embodiment of the present invention, determining the current operating condition of the fuel cell engine according to the current output power and the target power includes:

[0011] Determining whether the target power is less than or equal to a preset power;

[0012] If the target power is less than or equal to the preset power, the current operating condition is determined to be a low-power operating condition; otherwise, whether the current output power is less than the target power is determined;

[0013] If the current output power is less than the target power, the current operating condition is determined to be a loading condition; otherwise, whether the current output power is equal to the target power is determined;

[0014] If the current output power is equal to the target power, the current operating condition is determined to be a steady-state operating condition; otherwise, the current operating condition is determined to be a load-reducing operating condition.

[0015] According to an embodiment of the present invention, determining the first target opening of the intake combination valve according to the current operating condition includes:

[0016] If the current operating condition is the low-power operating condition, the first target opening is a first preset opening;

[0017] If the current working condition is the loading working condition, the first target opening is a second preset opening, wherein the second preset opening is greater than the first preset opening;

[0018] If the current operating condition is the steady-state operating condition, the first target opening is in a first preset opening range determined by the current opening of the intake combination valve, wherein a lower limit of the first preset opening range is less than the current opening of the intake combination valve, and an upper limit of the first preset opening range is greater than the current opening of the intake combination valve;

[0019] If the current operating condition is the load reduction condition, the first target opening is in a second preset opening range determined by the current opening of the intake combination valve, wherein an upper limit value of the second preset opening range is smaller than the current opening of the intake combination valve.

[0020] According to one embodiment of the present invention, determining the target speed of the air compressor of the air supply system and the second target opening of the back pressure valve based on the first target opening includes:

[0021] determining an air demand value according to the first target opening;

[0022] Based on the MAP of the air compressor, a target speed of the air compressor and a second target opening of the back pressure valve are determined according to the air demand value.

[0023] According to one embodiment of the present invention, determining the target opening and closing period of the drain valve and the third target opening degree of the bypass valve according to the current working condition includes:

[0024] Obtain the table of working condition-drain valve opening and closing cycle-bypass valve opening;

[0025] Based on the operating condition-drain valve opening and closing cycle-bypass valve opening table, the target opening and closing cycle of the drain valve and the third target opening of the bypass valve are determined according to the current operating condition.

[0026] According to the oxygen supply control method of the air supply system proposed in the embodiment of the present invention, the current working condition of the fuel cell engine is judged according to the current output power and target power of the fuel cell engine. After judging the current working condition, the first target opening of the intake combination valve is determined, and the target speed of the air compressor and the second target opening of the back pressure valve are determined. The target opening and closing cycle of the drain valve and the third target opening of the bypass valve are determined according to the current working condition, and finally the corresponding components are controlled according to the target opening, target speed and target opening and closing cycle. Thus, by controlling the amount of oxygen supplied by the air supply system according to different working conditions, the load-up and load-down efficiency of the engine power is guaranteed, the utilization rate of oxygen and catalyst is improved, the efficiency of the fuel cell engine is improved, and the overall cost of the fuel cell stack is reduced.

[0027] To achieve the above-mentioned purpose, the second embodiment of the present invention proposes an oxygen supply control device for an air supply system, wherein an intake combination valve, an oxygen separation membrane and a gas-liquid separator are arranged between an intercooler and a humidifier of the air supply system, the input end of the intake combination valve is connected to the output end of the intercooler, the input end of the oxygen separation membrane is connected to the bypass outlet of the intake combination valve, the output end of the oxygen separation membrane is connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is respectively connected to the main outlet of the intake combination valve and the input end of the humidifying component, wherein the device comprises:

[0028] An acquisition module, used to acquire the current output power and target power of the fuel cell engine;

[0029] a target determination module, configured to determine a current operating condition of the fuel cell engine according to the current output power and the target power, and to determine a first target opening of the intake combination valve according to the current operating condition, and to determine a target speed of an air compressor of the air supply system and a second target opening of a back pressure valve based on the first target opening, and to determine a target opening and closing period of the drain valve and a third target opening of a bypass valve according to the current operating condition;

[0030] A control module is used to control the intake combination valve according to the first target opening, control the air compressor according to the target speed, control the back pressure valve according to the second target opening, control the drain valve according to the target opening and closing cycle, and control the bypass valve according to the third target opening.

[0031] According to one embodiment of the present invention, the target determination module is specifically used to:

[0032] Determining whether the target power is less than or equal to a preset power;

[0033] If the target power is less than or equal to the preset power, the current operating condition is determined to be a low-power operating condition; otherwise, whether the current output power is less than the target power is determined;

[0034] If the current output power is less than the target power, the current operating condition is determined to be a loading condition; otherwise, whether the current output power is equal to the target power is determined;

[0035] If the current output power is equal to the target power, the current operating condition is determined to be a steady-state operating condition; otherwise, the current operating condition is determined to be a load-reducing operating condition.

[0036] According to one embodiment of the present invention, the target determination module is specifically used to:

[0037] If the current operating condition is the low-power operating condition, the first target opening is a first preset opening;

[0038] If the current working condition is the loading working condition, the first target opening is a second preset opening, wherein the second preset opening is greater than the first preset opening;

[0039] If the current operating condition is the steady-state operating condition, the first target opening is in a first preset opening range determined by the current opening of the intake combination valve, wherein a lower limit of the first preset opening range is less than the current opening of the intake combination valve, and an upper limit of the first preset opening range is greater than the current opening of the intake combination valve;

[0040] If the current operating condition is the load reduction condition, the first target opening is in a second preset opening range determined by the current opening of the intake combination valve, wherein an upper limit value of the second preset opening range is smaller than the current opening of the intake combination valve.

[0041] According to one embodiment of the present invention, the target determination module is specifically used to:

[0042] determining an air demand value according to the first target opening;

[0043] Based on the MAP of the air compressor, a target speed of the air compressor and a second target opening of the back pressure valve are determined according to the air demand value.

[0044] According to one embodiment of the present invention, the target determination module is specifically used to:

[0045] Obtain the table of working condition-drain valve opening and closing cycle-bypass valve opening;

[0046] Based on the operating condition-drain valve opening and closing cycle-bypass valve opening table, the target opening and closing cycle of the drain valve and the third target opening of the bypass valve are determined according to the current operating condition.

[0047] According to the oxygen supply control device of the air supply system proposed in the embodiment of the present invention, the current working condition of the fuel cell engine is judged according to the current output power and target power of the fuel cell engine. After judging the current working condition, the first target opening of the intake combination valve is determined, and the target speed of the air compressor and the second target opening of the back pressure valve are determined. The target opening and closing cycle of the drain valve and the third target opening of the bypass valve are determined according to the current working condition, and finally the corresponding components are controlled according to the target opening, target speed and target opening and closing cycle. Thus, by controlling the amount of oxygen supplied by the air supply system according to different working conditions, the load-up and load-down efficiency of the engine power is guaranteed, the utilization rate of oxygen and catalyst is improved, the efficiency of the fuel cell engine is improved, and the overall cost of the fuel cell stack is reduced.

[0048] To achieve the above-mentioned purpose, a third aspect of the present invention proposes an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the oxygen supply control method of the air supply system as described in the above-mentioned embodiment.

[0049] To achieve the above objectives, a fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the oxygen supply control method of the air supply system as described in the above embodiments.

[0050] To achieve the above objectives, a fifth aspect of the present invention provides a computer program product, including a computer program, which, when executed by a processor, is used to implement the oxygen supply control method of the air supply system as described in the above embodiments.

[0051] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0053] Figure 1 It is a structural schematic diagram of an air supply system and a fuel cell stack in the related art;

[0054] Figure 2 A flow chart of an oxygen supply control method for an air supply system provided by one embodiment of the present invention;

[0055] Figure 3 A partial structural schematic diagram of an air supply system according to an embodiment of the present invention;

[0056] Figure 4 A flow chart of an oxygen supply control method for an air supply system according to a specific embodiment of the present invention;

[0057] Figure 5 A block diagram of an oxygen supply control device for an air supply system according to an embodiment of the present invention;

[0058] Figure 6 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention.

[0059] Reference numerals:

[0060] 1-filter, 2-meter, 3-air compression component, 4-cooling component, 5-intake component, 6-humidification component, 7-back pressure valve, 8-muffler, 9-first sealing valve, 10-temperature sensor, 11-pressure sensor, 12-fuel cell stack, 13-second sealing valve, 20-air supply system, 21-intercooler, 22-intake combination valve, 23-oxygen separation membrane, 24-gas-liquid separator, 25-humidifier, 30-oxygen supply control device of air supply system, 100-acquisition module, 200-target determination module, 300-control module, 601-memory, 602-processor, 603-communication interface. DETAILED DESCRIPTION

[0061] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0062] The following describes an oxygen supply control method, device, equipment, medium and product of an air supply system according to an embodiment of the present invention with reference to the accompanying drawings.

[0063] Before introducing the air supply system of the embodiment of the present invention and the fuel cell engine having the same, the air supply system used in the related art is briefly introduced.

[0064] Specifically, if Figure 1 As shown, Figure 1 It is a schematic diagram of the structure of the air supply system and the fuel cell stack in the related art, wherein:

[0065] Filter 1, meter 2, air compressor component 3, cooling component 4, air intake component 5, humidification component 6, back pressure valve 7, muffler 8, first sealing valve 9, temperature sensor 10, pressure sensor 11, fuel cell stack 12, second sealing valve 13.

[0066] The output end of the filter 1 is connected to the input end of the air compressor component 3, and a flowmeter 2 is provided between the filter 1 and the air compressor component 3. The output port of the air compressor component 3 is connected to the input port of the cooling component 4, and the output end of the cooling component 4 is connected to the input end of the air intake component 5. One output end of the air intake component 5 is connected to the input end of the humidification component 6, and the other output end of the air intake component 5 is connected to the muffler 8. One output end of the humidification component 6 is connected to the input end of the first sealing valve 9, and the other output end of the humidification component 6 is connected to the input end of the back pressure component 7. The output end of the back pressure component 7 is connected to the muffler 8. The output end of the first sealing valve 9 is connected to the inlet of the battery stack 12, and a temperature sensor 10 and a pressure sensor 11 are provided between the first sealing valve 9 and the inlet of the battery stack 12. The outlet of the battery stack 12 is connected to the input end of the second sealing valve 13, and the output end of the second sealing valve 13 is connected to the other input end of the humidification component 6. The air passes through the filter 1 to filter out dust and impurities, and the air compression component 2 pressurizes the air to allow it to enter the cooling component 3. The cooling component 3 cools the incoming air and controls the air temperature to be within a temperature range suitable for chemical reactions. At the same time, the humidification component 6 humidifies the dry air to a humidity suitable for participating in the chemical reaction. In this process, if it is detected that the air pressure exceeds a certain threshold, a portion of the air will be discharged through the back pressure component 7 to ensure that the air participating in the chemical reaction in the battery stack 12 is in an appropriate state.

[0067] However, when the stack is in low-power operation, the fuel cell engine requires a lower air flow pressure. At this time, the lowest operating condition of the air compressor cannot meet the use requirements. If the air compressor pressure needs to be met, the air flow will increase, and all the air will flow into the fuel cell air path. The membrane electrode will be too dry, the performance will be reduced, and the durability will be affected. Therefore, it is necessary to cooperate with the intake combination valve to open the bypass path of the intake combination valve to discharge the excessive flow and waste the energy of the air compressor. In the high-power range, in order to increase the reaction rate of the fuel cell stack, the air compressor needs to increase the operating pressure and air flow, and increase the air metering ratio (the current industry air metering ratio is about 2). However, a large amount of oxygen in the air is not used, and the exhaust gas contains a large amount of oxygen and energy. In addition, as the air flow increases, the reaction accelerates, the parasitic power of the air compressor increases, and the output of the fuel cell stack decreases. The cooling capacity of the intercooler, the humidification capacity of the humidifier, and the heat dissipation capacity of the radiator all need to be increased, and the cost will increase significantly. At the same time, the increase in the volume of the intercooler and humidifier will increase the difficulty of arranging the fuel cell system, reduce the volume power density of the system, increase the pressure drop, and increase the power consumption of the air compressor.

[0068] In order to solve the problem that the above-mentioned air is not purified, resulting in a large amount of oxygen in the gas entering the stack being discharged before being used, and the lack of a solution to control the air supply according to the working conditions in the background technology, the present invention proposes an oxygen supply control method for an air supply system, in which the current working condition of the fuel cell engine is judged according to the current output power and target power of the fuel cell engine. After judging the current working condition, the first target opening of the intake combination valve is determined, and the target speed of the air compressor and the second target opening of the back pressure valve are determined. The target opening and closing cycle of the drain valve and the third target opening of the bypass valve are determined according to the current working condition, and finally the corresponding components are controlled according to the target opening, target speed and target opening and closing cycle. Thus, by controlling the amount of oxygen supplied by the air supply system according to different working conditions, the load-up and load-down efficiency of the engine power is guaranteed, the utilization rate of oxygen and catalyst is improved, the efficiency of the fuel cell engine is improved, and the overall cost of the fuel cell stack is reduced.

[0069] Figure 2 The present invention is a flowchart of an oxygen supply control method for an air supply system provided by an embodiment of the present invention.

[0070] In this embodiment, if Figure 3 As shown, Figure 3 It is a partial structural schematic diagram of an air supply system according to an embodiment of the present invention.

[0071] The air supply system 20 includes an intercooler 21 , an intake combined valve 22 , an oxygen separation membrane 23 , a gas-liquid separator 24 and a humidifier 25 .

[0072] Specifically, the input end of the intake combination valve 22 is connected to the output end of the intercooler 21, the input end of the oxygen separation membrane 23 is connected to the bypass outlet of the intake combination valve 22, the output end of the oxygen separation membrane 23 is connected to the input end of the gas-liquid separator 24, and the output end of the gas-liquid separator 24 is respectively connected to the main outlet of the intake combination valve 22 and the input end of the humidifier 25.

[0073] Specifically, during operation, the pressurized air is cooled by the intercooler and then enters the front end of the oxygen separation membrane through the intake combination valve. The oxygen separation membrane is selectively permeable to oxygen. Due to the pressure difference between the front and rear ends, oxygen-rich air passes through the low-pressure side (permeability side) of the oxygen separation membrane, and other gases such as nitrogen cannot pass through the oxygen separation membrane and are discharged from the bypass outlet; the oxygen-rich air that passes through the oxygen separation membrane enters the gas-liquid separation element, and the liquid impurities such as water vapor in the oxygen-rich air are separated by the gas-liquid separator. The dry oxygen-rich air after separation enters the humidifier, and the humidifier humidifies the dry oxygen-rich air to turn the dry oxygen-rich air into a reactive gas with appropriate humidity, so as to increase the reaction rate of the fuel cell stack.

[0074] Furthermore, if Figure 2As shown, the oxygen supply control method of the air supply system comprises the following steps:

[0075] In step S201, the current output power and target power of the fuel cell engine are obtained.

[0076] Among them, the current output power refers to the power value actually output by the fuel cell engine under the current working state; the target power refers to the output power value expected to be achieved by the fuel cell engine under specific working conditions.

[0077] Specifically, the target power of the fuel cell engine changes with the change of working conditions. For example, when the vehicle changes from normal driving to climbing, the engine power should increase accordingly, and its target power also increases accordingly. However, in actual driving, the current output power of the engine may not reach the target power. Therefore, the embodiment of the present invention needs to obtain the actual current output power while obtaining the target power.

[0078] Exemplarily, the embodiment of the present invention can obtain the current output power and target power of the fuel cell engine through the FCU (Fuel-Cell Control Unit).

[0079] In step S202, the current operating condition of the fuel cell engine is determined based on the current output power and the target power, and the first target opening of the intake combination valve is determined based on the current operating condition, and the target speed of the air compressor of the air supply system and the second target opening of the back pressure valve are determined based on the first target opening, and the target opening and closing period of the drain valve and the third target opening of the bypass valve are determined based on the current operating condition.

[0080] Specifically, after obtaining the current output power and target power of the fuel cell engine, the current operating condition of the fuel cell engine is determined based on the current output power and the target power based on a preset judgment method, and the current operating condition determines the degree of power increase or decrease currently required by the fuel cell engine. Since the embodiment of the present invention aims to affect the efficiency of the fuel cell engine by controlling the amount of oxygen supplied by the air supply system, the first target opening of the intake combination valve can be calculated according to the current operating condition, and the opening and closing degree of the intake combination valve can be controlled according to the first target opening to achieve the purpose of controlling the amount of oxygen supplied by the air supply system. At the same time, after the opening of the intake combination valve changes, in order to ensure that there is sufficient air in the air supply system, the target speed of the air compressor and the second target opening of the back pressure valve also change with the first target opening; at this time, due to the change in the amount of gas entering the stack, the target opening and closing cycle of the drain valve and the third target opening of the bypass valve also change with the current operating condition.

[0081] Further, in some embodiments, the current operating condition of the fuel cell engine is determined based on the current output power and the target power, including: determining whether the target power is less than or equal to the preset power; if the target power is less than or equal to the preset power, determining that the current operating condition is a low-power condition, otherwise, determining whether the current output power is less than the target power; if the current output power is less than the target power, determining that the current operating condition is a loading condition, otherwise, determining whether the current output power is equal to the target power; if the current output power is equal to the target power, determining that the current operating condition is a steady-state condition, otherwise, determining that the current operating condition is a load-reducing condition.

[0082] The preset power may be a power value set by technicians in this field according to actual needs, or may be a power value obtained through a limited number of computer simulations, which is not specifically limited here.

[0083] Specifically, the embodiment of the present invention can judge the current working condition of the fuel cell engine by the relationship between the target power, the current output power and the preset power. When the target power is less than or equal to the preset power, it means that the target power required by the vehicle is low, and the current working condition is determined to be a low-power working condition; if the target power is greater than the preset power, it is determined whether the current output power is less than the target power. If the current output power is less than the target power, it means that the output of the current fuel cell engine has not reached the target power, so it is necessary to continue to increase the current output power, and the current working condition is determined to be a loading working condition; if the target power is greater than the preset power, and the current output power is equal to the target power, it means that the current output power has reached the target power requirement, and after the current output power reaches the target power for more than 1s, the current working condition is determined to be a steady-state working condition; if the target power is greater than the preset power, and the current output power is greater than the target power, the output of the fuel cell engine has exceeded the target power. In order to avoid energy waste, it is necessary to reduce the power of the fuel cell engine, and the current working condition is determined to be a load-reducing working condition.

[0084] For example, the preset power is set to 30% of the rated power. When the target power ≤ the preset power, the current operating condition is determined to be a low-power condition; when the target power > the preset power and the current output power < the target power, the current operating condition is determined to be a loading condition; when the target power > the preset power and the current output power = the target power, after the current output power = the target power is maintained for more than 1s, the current operating condition is determined to be a steady-state condition; when the target power > the preset power and the current output power > the target power, the current operating condition is determined to be a load-reducing condition.

[0085] Further, in some embodiments, a first target opening of the intake combination valve is determined according to the current operating condition, including: if the current operating condition is a low-power condition, the first target opening is a first preset opening; if the current operating condition is a loaded condition, the first target opening is a second preset opening, wherein the second preset opening is greater than the first preset opening; if the current operating condition is a steady-state condition, the first target opening is in a first preset opening interval determined by the current opening of the intake combination valve, wherein a lower limit value of the first preset opening interval is less than the current opening of the intake combination valve, and an upper limit value of the first preset opening interval is greater than the current opening of the intake combination valve; if the current operating condition is a reduced-load condition, the first target opening is in a second preset opening interval determined by the current opening of the intake combination valve, wherein an upper limit value of the second preset opening interval is less than the current opening of the intake combination valve.

[0086] The first preset opening and the second preset opening may be intake valve openings set by technicians in this field according to actual needs, or may be intake valve openings obtained through a limited number of computer simulations, and are not specifically limited here.

[0087] Specifically, when the current working condition is a low-power working condition, the first target opening is set to the first preset opening. Due to the low power of the fuel cell engine, the oxygen entering the stack cannot fully react with the hydrogen in the stack and is discharged, resulting in a lot of waste. Therefore, the first preset opening of the embodiment of the present invention can be set to the opening of the air passing through the oxygen separation membrane and the gas-liquid separator. After the air is filtered through the oxygen separation membrane, only pure oxygen gas is left. Pure oxygen is used to participate in the chemical reaction of the stack, which effectively solves the problem of energy waste and improves the efficiency of the chemical reaction. When the current working condition is a loading condition, the first target opening is set to the second preset opening. During the loading condition, the oxygen separation membrane has a hysteresis in separating oxygen, and the loading speed of the fuel cell engine cannot be guaranteed. Therefore, it is necessary to increase the air flow rate and increase the opening of the intake combination valve. One way of air directly enters the battery stack, and the other way of air enters the battery stack after filtering through the oxygen separation membrane and the gas-liquid separator to ensure the loading speed of the fuel cell. When the current working condition is a steady-state condition, gas with a high oxygen concentration is continuously delivered to the fuel cell to ensure the stable operation of the stack and maximize the efficiency of the chemical reaction. In the embodiment of the present invention, when the current working condition is a steady-state working condition, the first target opening is set to be within the first preset opening interval, the upper limit of the first preset opening interval is greater than the current opening of the intake combination valve, and the lower limit of the first preset opening interval is less than the current opening of the intake combination valve. For example, when the current opening of the intake combination valve is 40%, the first preset opening interval can be set to 30% to 50%. When the current working condition is a load reduction condition, the opening of the intake combination valve needs to be reduced due to the reduction in power of the fuel cell engine. At this time, the embodiment of the present invention can set the first target opening to be within the second preset opening interval, and the upper limit of the second preset opening interval is less than the current opening of the intake combination valve. For example, when the current opening of the intake combination valve is 50%, the second preset opening interval is set to be less than 40%.

[0088] For example, when the loading condition changes to the steady-state condition, when the current output power is less than the target power, the intake combination valve needs to increase the opening, reduce the use of high-purity oxygen, and ensure that there is an excess oxygen extraction current during the load current process; when the current output power = target power and the duration is more than 1s, the steady-state condition is triggered. At this time, the intake combination valve needs to reduce the opening and increase the use of high-purity oxygen, but this process must ensure that there is an excess oxygen extraction current. When the load reduction condition changes to the steady-state condition and the low condition, when the current output power is greater than the target power, the intake combination valve needs to reduce the opening and increase the use of high-purity oxygen to ensure that there is an excess oxygen extraction current during the load current process; when the current output power = target power and the duration is more than 1s, the steady-state condition is triggered. At this time, the intake combination valve needs to increase the opening and increase the use of high-purity oxygen, but this process must ensure that there is an excess oxygen extraction current.

[0089] Further, in some embodiments, a target speed of an air compressor of an air supply system and a second target opening of a back-pressure valve are determined based on a first target opening, including: determining an air demand value according to the first target opening; and determining the target speed of the air compressor and the second target opening of the back-pressure valve according to the air demand value based on a MAP of the air compressor.

[0090] Specifically, the air demand value is determined by the first target opening of the intake combination valve. Each power condition corresponds to an air / oxygen flow rate and pressure. When the power is stable, the calculation formula for oxygen usage is:

[0091] I 2,reacted =Mo2*nI / (4F)

[0092] Among them, 2,reacted is the oxygen consumption (g / s), Mo2 is the molar mass of oxygen (32g / mol), n is the number of cells in the stack, I is the stack current (A, i.e., C / s, which indicates the number of electrons passing through per second), F is the Faraday coefficient (C / mol), which indicates the charge per mole, and 4 means that 4 mol of electrons are generated by the reaction of 1 mol of oxygen. nI / (4F) indicates the amount of oxygen consumed per second.

[0093] According to the ideal gas state equation PV = nRT, ρ = m / V, we can convert ρ1 = ρ2*(P1 / P2)*(T2 / T1), where the unit of temperature T is K, the unit of pressure P is pa, and the unit of ρ is Kg / m 3 .

[0094] Under standard conditions (0°C, 1 atm), the oxygen density is 1.429 kg / m 3 , so the oxygen density at different temperatures ρ = 1.429*(actual pressure / standard physical atmospheric pressure)*(273.15 / actual absolute temperature);

[0095] The volume proportion of each component in the air: nitrogen (N2) accounts for about 78%, oxygen (O2) accounts for about 21%. At different temperatures, the volume of oxygen in the air used is:

[0096] V = nI*1.429*(actual pressure / standard physical atmospheric pressure)*(273.15 / actual absolute temperature) / [0.21*(4F)];

[0097] The excess air coefficient of the fuel cell is α. Under different temperatures, calculate the amount of air passing through the intake combination valve per second under load conditions (under standard conditions):

[0098] Wair = αnI*1.429*(actual pressure / standard physical atmospheric pressure)*(273.15 / actual absolute temperature) / [0.21*(4F)];

[0099] Wo2=αMo2*nI / (4F);

[0100] Therefore, according to the above calculation formula and the air compressor MAP, the theoretical pressure at different power points is determined, the air demand value under the flow rate is calculated, and the theoretical air compressor speed and the opening of the back pressure valve under each operating point are determined. During the steady-state operation of each power point, due to the influence of practical problems such as the flow resistance of the air line and air filter, the back pressure of the exhaust line, etc., the theoretical flow rate and pressure are different from the actual flow rate and pressure according to the pressure P that the stack needs to maintain when extracting the current. 理论 , air / oxygen flow calculation value W 理论 As the target value, the real-time pressure collected by the air path and the pressure P fed back by the flow sensor 实际 、Flow rate W 实际 As the actual value, the relationship between the theoretical value and the actual value is compared and calibrated:

[0101] The effects of adjusting the air compressor and back pressure valve on flow and pressure are as follows:

[0102] (1) When the air compressor speed increases and the back pressure valve opening remains unchanged, the actual operating pressure increases and the flow rate increases;

[0103] (2) When the air compressor speed decreases and the back pressure valve opening remains unchanged, the actual operating pressure decreases and the flow rate decreases;

[0104] (3) When the air compressor speed remains unchanged and the back pressure valve opening decreases, the actual operation increases and the flow rate decreases;

[0105] (4) When the air compressor speed remains unchanged and the back pressure valve opening increases, the actual operation increases and the flow rate decreases.

[0106] Further, in some embodiments, a target opening and closing cycle of the drain valve and a third target opening of the bypass valve are determined according to current operating conditions, including: obtaining an operating condition-drain valve opening and closing cycle-bypass valve opening table; based on the operating condition-drain valve opening and closing cycle-bypass valve opening table, determining the target opening and closing cycle of the drain valve and the third target opening of the bypass valve according to current operating conditions.

[0107] Specifically, the drain valve opening and closing cycle and bypass valve opening under different working conditions are calibrated, and a working condition-drain valve opening and closing cycle-bypass valve opening table is obtained according to the calibration results. After obtaining the current working condition of the fuel engine, the target opening cycle of the drain valve and the third target opening of the bypass valve under the current working condition are obtained based on the working condition-drain valve opening and closing cycle-bypass valve opening table.

[0108] In step S203, the intake combination valve is controlled according to the first target opening, the air compressor is controlled according to the target speed, the back pressure valve is controlled according to the second target opening, the drain valve is controlled according to the target opening and closing cycle, and the bypass valve is controlled according to the third target opening.

[0109] Specifically, in step S202, the first target opening of the intake combination valve is determined according to the current operating condition, the target speed of the air compressor and the second target opening of the back pressure valve are determined according to the first target opening, and the target opening and closing cycle of the drain valve and the third target opening of the bypass valve are determined according to the current operating condition. After the FCU obtains these target data, the intake combination valve is controlled according to the first target opening, the air compressor is controlled according to the target speed, the back pressure valve is controlled according to the second target opening, the drain valve is controlled according to the target opening and closing cycle, and the bypass valve is controlled according to the third target opening.

[0110] In order to enable those skilled in the art to further understand the oxygen supply control method of the air supply system according to the embodiment of the present application, it is described in detail below in conjunction with specific embodiments.

[0111] Specifically, Figure 4 As shown, the oxygen supply control method of the air supply system comprises the following steps:

[0112] S401, FCU sends power data to start the fuel cell engine.

[0113] S402, judge the current working condition, when the target power is greater than the preset power and the current output power is less than the target power, execute step S403; when the target power is greater than the preset power and the current output power is equal to the target power; when the target power is less than or equal to the preset power, execute step S404; when the target power is less than or equal to the preset power, execute step S405; when the target power is greater than the preset power and the current output power is greater than the target power, execute step S406.

[0114] S403, the current working condition is a loading working condition, and then step S407 is executed.

[0115] S404: The current operating condition is a steady-state condition, and then step S408 is executed.

[0116] S405, the current operating condition is a low power operating condition, and then step S409 is executed.

[0117] S406, the current working condition is a load reduction condition, and then step S410 is executed.

[0118] S407, the opening of the intake combined valve is increased to reduce the amount of high-purity oxygen used and quickly pull the load.

[0119] S408, reduce the opening of the air intake combination valve as much as possible to increase the amount of high-purity oxygen.

[0120] S409, the air intake combination valve is closed and only high-purity oxygen is used.

[0121] S410, the intake combination valve is reduced to increase the amount of high-purity oxygen.

[0122] S411, the air compressor speed is adjusted to the target and the back pressure valve is adjusted to the second target opening.

[0123] S412, calibrating the target opening and closing cycle of the drain valve, and calibrating the third target opening of the bypass valve.

[0124] According to the oxygen supply control method of the air supply system proposed in the embodiment of the present invention, the current working condition of the fuel cell engine is judged according to the current output power and target power of the fuel cell engine. After judging the current working condition, the first target opening of the intake combination valve is determined, and the target speed of the air compressor and the second target opening of the back pressure valve are determined. The target opening and closing cycle of the drain valve and the third target opening of the bypass valve are determined according to the current working condition, and finally the corresponding components are controlled according to the target opening, target speed and target opening and closing cycle. Thus, by controlling the amount of oxygen supplied by the air supply system according to different working conditions, the load-up and load-down efficiency of the engine power is guaranteed, the utilization rate of oxygen and catalyst is improved, the efficiency of the fuel cell engine is improved, and the overall cost of the fuel cell stack is reduced.

[0125] Next, the oxygen supply control device of the air supply system according to the embodiment of the present invention will be described with reference to the accompanying drawings.

[0126] Figure 5 Detailed description is a block diagram of an oxygen supply control device for an air supply system according to an embodiment of the present invention.

[0127] In this embodiment, an intake combination valve, an oxygen separation membrane and a gas-liquid separator are arranged between the intercooler and the humidifier of the air supply system, the input end of the intake combination valve is connected to the output end of the intercooler, the input end of the oxygen separation membrane is connected to the bypass outlet of the intake combination valve, the output end of the oxygen separation membrane is connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is respectively connected to the main outlet of the intake combination valve and the input end of the humidification component, wherein the oxygen supply control device 30 of the air supply system includes: an acquisition module 100, a target determination module 200 and a control module 300.

[0128] Wherein, the acquisition module 100 is used to acquire the current output power and target power of the fuel cell engine;

[0129] A target determination module 200, for determining a current operating condition of the fuel cell engine according to the current output power and the target power, and determining a first target opening of the intake combination valve according to the current operating condition, and determining a target speed of the air compressor of the air supply system and a second target opening of the back pressure valve based on the first target opening, and determining a target opening and closing cycle of the drain valve and a third target opening of the bypass valve according to the current operating condition;

[0130] The control module 300 is used to control the intake combination valve according to the first target opening, control the air compressor according to the target speed, control the back pressure valve according to the second target opening, control the drain valve according to the target opening and closing cycle, and control the bypass valve according to the third target opening.

[0131] According to one embodiment of the present invention, the target determination module 200 is specifically used to: determine whether the target power is less than or equal to the preset power; if the target power is less than or equal to the preset power, determine that the current operating condition is a low-power condition, otherwise, determine whether the current output power is less than the target power; if the current output power is less than the target power, determine that the current operating condition is a loading condition, otherwise, determine whether the current output power is equal to the target power; if the current output power is equal to the target power, determine that the current operating condition is a steady-state condition, otherwise, determine that the current operating condition is a load reduction condition.

[0132] According to one embodiment of the present invention, the target determination module 200 is specifically configured to:

[0133] If the current operating condition is a low-power condition, the first target opening is a first preset opening; if the current operating condition is a loaded condition, the first target opening is a second preset opening, wherein the second preset opening is greater than the first preset opening; if the current operating condition is a steady-state condition, the first target opening is in a first preset opening interval determined by the current opening of the intake combination valve, wherein the lower limit value of the first preset opening interval is less than the current opening of the intake combination valve, and the upper limit value of the first preset opening interval is greater than the current opening of the intake combination valve; if the current operating condition is a reduced-load condition, the first target opening is in a second preset opening interval determined by the current opening of the intake combination valve, wherein the upper limit value of the second preset opening interval is less than the current opening of the intake combination valve.

[0134] According to one embodiment of the present invention, the target determination module 200 is specifically used to: determine the air demand value according to the first target opening; based on the MAP of the air compressor, determine the target speed of the air compressor and the second target opening of the back pressure valve according to the air demand value.

[0135] According to one embodiment of the present invention, the target determination module 200 is specifically used to: obtain the operating condition-drain valve opening and closing cycle-bypass valve opening table; based on the operating condition-drain valve opening and closing cycle-bypass valve opening table, determine the target opening and closing cycle of the drain valve and the third target opening of the bypass valve according to the current operating condition.

[0136] According to the oxygen supply control device of the air supply system proposed in the embodiment of the present invention, the current working condition of the fuel cell engine is judged according to the current output power and target power of the fuel cell engine. After judging the current working condition, the first target opening of the intake combination valve is determined, and the target speed of the air compressor and the second target opening of the back pressure valve are determined. The target opening and closing cycle of the drain valve and the third target opening of the bypass valve are determined according to the current working condition, and finally the corresponding components are controlled according to the target opening, target speed and target opening and closing cycle. Thus, by controlling the amount of oxygen supplied by the air supply system according to different working conditions, the load-up and load-down efficiency of the engine power is guaranteed, the utilization rate of oxygen and catalyst is improved, the efficiency of the fuel cell engine is improved, and the overall cost of the fuel cell stack is reduced.

[0137] Figure 6 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. The electronic device may include:

[0138] A memory 601 , a processor 602 , and a computer program stored in the memory 601 and executable on the processor 602 .

[0139] When the processor 602 executes the program, the oxygen supply control method of the air supply system provided in the above embodiment is implemented.

[0140] Furthermore, the electronic device further comprises:

[0141] The communication interface 603 is used for communication between the memory 601 and the processor 602 .

[0142] The memory 601 is used to store computer programs that can be executed on the processor 602 .

[0143] The memory 601 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0144] If the memory 601, the processor 602 and the communication interface 603 are implemented independently, the communication interface 603, the memory 601 and the processor 602 can be connected to each other through a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0145] Optionally, in a specific implementation, if the memory 601, the processor 602 and the communication interface 603 are integrated on a chip, the memory 601, the processor 602 and the communication interface 603 can communicate with each other through an internal interface.

[0146] The processor 602 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0147] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the oxygen supply control method of the air supply system as described above is implemented.

[0148] An embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements the above oxygen supply control method for an air supply system.

[0149] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0150] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0151] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An oxygen supply control method for an air supply system, characterized in that: An intake combined valve, an oxygen separation membrane and a gas-liquid separator are arranged between the intercooler and the humidifier of the air supply system, the input end of the intake combined valve is connected to the output end of the intercooler, the input end of the oxygen separation membrane is connected to the bypass outlet of the intake combined valve, the output end of the oxygen separation membrane is connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is respectively connected to the main outlet of the intake combined valve and the input end of the humidifying component, wherein the method comprises the following steps: Obtaining the current output power and target power of the fuel cell engine; Determining a current operating condition of the fuel cell engine according to the current output power and the target power, determining a first target opening of the intake combination valve according to the current operating condition, determining a target speed of an air compressor of the air supply system and a second target opening of a back pressure valve based on the first target opening, and determining a target opening and closing period of a drain valve and a third target opening of a bypass valve according to the current operating condition; The intake combination valve is controlled according to the first target opening, the air compressor is controlled according to the target speed, the back pressure valve is controlled according to the second target opening, the drain valve is controlled according to the target opening and closing cycle, and the bypass valve is controlled according to the third target opening.

2. The method according to claim 1, characterized in that The determining the current operating condition of the fuel cell engine according to the current output power and the target power includes: Determining whether the target power is less than or equal to a preset power; If the target power is less than or equal to the preset power, the current operating condition is determined to be a low-power operating condition; otherwise, whether the current output power is less than the target power is determined; If the current output power is less than the target power, the current operating condition is determined to be a loading condition; otherwise, whether the current output power is equal to the target power is determined; If the current output power is equal to the target power, the current operating condition is determined to be a steady-state operating condition; otherwise, the current operating condition is determined to be a load-reducing operating condition.

3. The method according to claim 2, characterized in that Determining the first target opening of the intake combination valve according to the current operating condition includes: If the current operating condition is the low-power operating condition, the first target opening is a first preset opening; If the current working condition is the loading working condition, the first target opening is a second preset opening, wherein the second preset opening is greater than the first preset opening; If the current operating condition is the steady-state operating condition, the first target opening is in a first preset opening range determined by the current opening of the intake combination valve, wherein a lower limit of the first preset opening range is less than the current opening of the intake combination valve, and an upper limit of the first preset opening range is greater than the current opening of the intake combination valve; If the current operating condition is the load reduction condition, the first target opening is in a second preset opening range determined by the current opening of the intake combination valve, wherein an upper limit value of the second preset opening range is smaller than the current opening of the intake combination valve.

4. The method according to claim 1, characterized in that: The step of determining a target speed of the air compressor of the air supply system and a second target opening of the back pressure valve based on the first target opening comprises: determining an air demand value according to the first target opening; Based on the MAP of the air compressor, a target speed of the air compressor and a second target opening of the back pressure valve are determined according to the air demand value.

5. The method according to claim 1, characterized in that The step of determining the target opening and closing period of the drain valve and the third target opening degree of the bypass valve according to the current working condition includes: Obtain the table of working condition-drain valve opening and closing cycle-bypass valve opening; Based on the operating condition-drain valve opening and closing cycle-bypass valve opening table, the target opening and closing cycle of the drain valve and the third target opening of the bypass valve are determined according to the current operating condition.

6. An oxygen supply control device for an air supply system, characterized in that: An intake combined valve, an oxygen separation membrane and a gas-liquid separator are arranged between the intercooler and the humidifier of the air supply system, the input end of the intake combined valve is connected to the output end of the intercooler, the input end of the oxygen separation membrane is connected to the bypass outlet of the intake combined valve, the output end of the oxygen separation membrane is connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is respectively connected to the main outlet of the intake combined valve and the input end of the humidifying component, wherein the device comprises: An acquisition module, used to acquire the current output power and target power of the fuel cell engine; a target determination module, configured to determine a current operating condition of the fuel cell engine according to the current output power and the target power, and to determine a first target opening of the intake combination valve according to the current operating condition, and to determine a target speed of an air compressor of the air supply system and a second target opening of a back pressure valve based on the first target opening, and to determine a target opening and closing period of a drain valve and a third target opening of a bypass valve according to the current operating condition; A control module is used to control the intake combination valve according to the first target opening, control the air compressor according to the target speed, control the back pressure valve according to the second target opening, control the drain valve according to the target opening and closing cycle, and control the bypass valve according to the third target opening.

7. The device according to claim 6, characterized in that The target determination module is specifically used for: Determining whether the target power is less than or equal to a preset power; If the target power is less than or equal to the preset power, the current operating condition is determined to be a low-power operating condition; otherwise, whether the current output power is less than the target power is determined; If the current output power is less than the target power, the current operating condition is determined to be a loading condition; otherwise, whether the current output power is equal to the target power is determined; If the current output power is equal to the target power, the current operating condition is determined to be a steady-state operating condition; otherwise, the current operating condition is determined to be a load-reducing operating condition.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the oxygen supply control method for the air supply system according to any one of claims 1 to 5.

9. A computer storage medium having a computer program stored thereon, characterized in that:The program is executed by a processor to implement the oxygen supply control method of the air supply system according to any one of claims 1 to 5.

10. A computer program product, characterized in that It comprises a computer program, which, when executed by a processor, is used to implement the oxygen supply control method of the air supply system according to any one of claims 1 to 5.

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