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

Abstract

The present application relates to a kind of oxygen supply control method, device, equipment, medium and product of air supply system.The method comprises: according to the current output power and target power of obtained vehicle, determine the current working condition of fuel cell engine, and determine the first target opening of inlet air combination valve, determine the target speed of air compressor and the second target opening of back pressure valve based on the first target opening, and according to current working condition, determine the target opening-closing period of drain valve and the third target opening of bypass valve;According to the first target opening, target speed, second target opening, target opening-closing period, third target opening, respectively control inlet air combination valve, air compressor, back pressure valve, drain valve, bypass valve.By this, by controlling the oxygen amount supplied by air supply system for different working conditions, guarantee the efficiency of engine power's rise load reduction, improve the utilization of oxygen and catalyst, improve the efficiency of fuel cell engine, overall reduce fuel cell stack cost.

Description

TECHNICAL FIELD

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

[0002] The fuel cell engine is an engine system that converts chemical energy into electrical energy through electrochemical reaction of hydrogen and oxygen, wherein the air supply system of the fuel cell engine is one of the key components, which is mainly responsible for filtering, humidifying, pressure regulating and other treatments of the air entering the fuel cell stack, so as to ensure that the temperature, humidity, pressure and flow of 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 the engine power is improved.

[0003] In related technologies, in order to improve the chemical reaction rate of the fuel cell engine, the engine power is increased by increasing the running rate of the air supply system, improving the running pressure of the air and the flow measurement ratio (the ratio of the actual flow to the theoretical demand flow).

[0004] However, in the prior art, when the fuel cell engine operates in a low power condition, the higher air flow measurement 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 operates at high power, the running rate of the air supply system increases, the parasitic power of the air compressor increases significantly, and the overall efficiency of the fuel cell engine decreases. A large amount of oxygen in the exhaust gas is discharged without being used, causing energy waste, which needs to be solved. SUMMARY

[0005] The present application provides an oxygen supply control method, device, equipment, medium and product of an air supply system, to solve the problem of lack of adjustment of air supply amount for different working conditions when improving the air running pressure and flow measurement ratio in related technologies, which leads to too dry fuel cell membrane motor or too large parasitic power of air compressor. The oxygen amount supplied by the air supply system is controlled for different working conditions, the engine power is ensured to be loaded and unloaded efficiently, 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.

[0006] To achieve the above object, the first aspect of the present application provides an oxygen supply control method of an air supply system, wherein a gas inlet combination valve, an oxygen separation membrane and a gas-liquid separator are arranged between a gas cooler and a humidifier of the air supply system, an input end of the gas inlet combination valve is connected with an output end of the gas cooler, an input end of the oxygen separation membrane is connected with a bypass outlet of the gas inlet combination valve, an output end of the oxygen separation membrane is connected with an input end of the gas-liquid separator, and output ends of the gas-liquid separator are connected with a main outlet of the gas inlet combination valve and an input end of the humidifier respectively, wherein the method comprises the following steps:

[0007] acquiring a current output power and a target power of a fuel cell engine;

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

[0009] controlling the gas inlet combination valve according to the first target opening degree, controlling the air compressor according to the target rotating speed, controlling the back pressure valve according to the second target opening degree, controlling the drain valve according to the target opening and closing period, and controlling the bypass valve according to the third target opening degree.

[0010] According to an embodiment of the present application, the determining of the current working condition of the fuel cell engine according to the current output power and the target power comprises:

[0011] judging 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, determining that the current working condition is a low power working condition, otherwise, judging whether the current output power is less than the target power;

[0013] if the current output power is less than the target power, determining that the current working condition is a loading working condition, otherwise, judging whether the current output power is equal to the target power;

[0014] if the current output power is equal to the target power, determining that the current working condition is a steady state working condition, otherwise, determining that the current working condition is a load shedding working condition.

[0015] According to an embodiment of the present application, the determining of the first target opening degree of the gas inlet combination valve according to the current working condition comprises:

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

[0017] If the current working condition is the loading working condition, then the first target opening is the 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, then the first target opening degree is within a first preset opening degree range determined by the current opening degree of the intake combination valve, wherein the lower limit of the first preset opening degree range is less than the current opening degree of the intake combination valve, and the upper limit of the first preset opening degree range is greater than the current opening degree of the intake combination valve.

[0019] If the current operating condition is the load reduction condition, then the first target opening degree is within a second preset opening degree range determined by the current opening degree of the intake combination valve, wherein the upper limit of the second preset opening degree range is less than the current opening degree of the intake combination valve.

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

[0021] The air demand value is determined based on the first target opening degree;

[0022] Based on the MAP of the air compressor, the target speed of the air compressor and the second target opening degree 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 cycle of the drain valve and the third target opening degree of the bypass valve based on the current operating conditions includes:

[0024] Get operating conditions - drain valve opening and closing cycle - bypass valve opening table;

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

[0026] The oxygen supply control method of the air supply system provided by the embodiment of the present application controls the oxygen supply amount of the air supply system according to different working conditions, ensures the power load raising and lowering efficiency of the engine, improves the utilization rate of oxygen and catalyst, improves the efficiency of the fuel cell engine, and reduces the cost of the fuel cell stack as a whole.

[0027] To achieve the above object, the second aspect of the present application provides an oxygen supply control device of an air supply system, wherein a cooler and a humidifier of the air supply system are provided with an air intake combination valve, an oxygen separation membrane and a gas-liquid separator, an input end of the air intake combination valve is connected with an output end of the cooler, an input end of the oxygen separation membrane is connected with a bypass outlet of the air intake combination valve, an output end of the oxygen separation membrane is connected with an input end of the gas-liquid separator, and an output end of the gas-liquid separator is connected with a main outlet of the air intake combination valve and an input end of the humidification assembly respectively, wherein the device comprises:

[0028] an acquisition module configured to acquire a current output power and a target power of the fuel cell engine;

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

[0030] a control module configured to control the air intake combination valve according to the first target opening degree, control the air compressor according to the target rotating speed, control the back pressure valve according to the second target opening degree, control the drain valve according to the target opening and closing period, and control the bypass valve according to the third target opening degree.

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

[0032] determine 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, it is determined that the current working condition is a low-power working condition, otherwise, it is determined whether the current output power is less than the target power;

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

[0035] If the current output power is equal to the target power, it is determined that the current working condition is a steady-state working condition, otherwise, it is determined that the current working condition is a load shedding working condition.

[0036] According to an embodiment of the present application, the target determination module is specifically configured to:

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

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

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

[0040] If the current working condition is the load shedding working condition, the first target opening degree is in a second preset opening degree interval determined by the current opening degree of the intake combination valve, wherein the upper limit value of the second preset opening degree interval is less than the current opening degree of the intake combination valve.

[0041] According to an embodiment of the present application, the target determination module is specifically configured to:

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

[0043] determine a target rotating speed of the air compressor and a second target opening degree of the back pressure valve according to the air demand value based on the MAP of the air compressor.

[0044] According to an embodiment of the present application, the target determination module is specifically configured to:

[0045] obtain a working condition-drain valve opening and closing period-bypass valve opening degree table;

[0046] Determine the target opening-closing period of the drain valve and the third target opening of the bypass valve according to the current working condition based on the working condition-drain valve opening-closing period-bypass valve opening table.

[0047] The oxygen supply control device of the air supply system provided by the embodiment of the present application determines the first target opening of the intake combination valve, the target rotating speed of the air compressor and the second target opening of the back pressure valve after judging the current working condition of the fuel cell engine according to the current output power and the target power of the fuel cell engine, determines the target opening-closing period of the drain valve and the third target opening of the bypass valve according to the current working condition, and finally controls the corresponding elements according to the target opening, the target rotating speed and the target opening-closing period. In this way, the oxygen supply amount of the air supply system is controlled according to different working conditions, the engine power loading and unloading efficiency is ensured, the utilization rate of oxygen and catalyst is improved, the efficiency of the fuel cell engine is improved, and the cost of the fuel cell stack is reduced as a whole.

[0048] To achieve the above object, the third aspect of the present application provides 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 embodiments.

[0049] To achieve the above object, the fourth aspect of the present application provides a computer readable storage medium having a computer program stored thereon, wherein the program 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 object, the fifth aspect of the present application provides a computer program product comprising a computer program, wherein the computer program is executed by a processor 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 application will be made apparent from the following description of embodiments, which will be given by way of example only. BRIEF DESCRIPTION OF DRAWINGS

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

[0053] Figure 1 Structure schematic diagram of the air supply system and the fuel cell stack in the related art;

[0054] Figure 2 Flow chart of the oxygen supply control method of the air supply system provided by one embodiment of the present application;

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

[0056] Figure 4 A flowchart 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 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention.

[0059] Figure label:

[0060] 1-Filter, 2-Meter, 3-Air compressor assembly, 4-Cooling assembly, 5-Intake assembly, 6-Humidification assembly, 7-Back pressure valve, 8-Silencer, 9-First sealing valve, 10-Temperature sensor, 11-Pressure sensor, 12-Electric 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 Implementation

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

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

[0063] Before introducing the air supply system and fuel cell engine having the embodiment of the present invention, let me briefly introduce the air supply system used in related technologies.

[0064] Specifically, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the air supply system and fuel cell stack in the related technology, wherein:

[0065] Filter 1, meter 2, air compression assembly 3, cooling assembly 4, air inlet assembly 5, humidification assembly 6, back pressure valve 7, silencer 8, first sealing valve 9, temperature sensor 10, pressure sensor 11, electric pile 12, second sealing valve 13.

[0066] The output end of the filter 1 is connected with the input end of the air compression assembly 3, and the flow meter 2 is arranged between the filter 1 and the air compression assembly 3, the output port of the air compression assembly 3 is connected with the input port of the cooling assembly 4, the output end of the cooling assembly 4 is connected with the input end of the air inlet assembly 5, one output end of the air inlet assembly 5 is connected with the input end of the humidification assembly 6, the other output end of the air inlet assembly 5 is connected with the silencer 8, one output end of the humidification assembly 6 is connected with the input end of the first sealing valve 9, the other output end of the humidification assembly 6 is connected with the input end of the back pressure assembly 7, the output end of the back pressure assembly 7 is connected with the silencer 8, the output end of the first sealing valve 9 is connected with the inlet of the electric pile 12, and the temperature sensor 10 and the pressure sensor 11 are arranged between the first sealing valve 9 and the inlet of the electric pile 12, the outlet of the electric pile 12 is connected with the input end of the second sealing valve 13, and the output end of the second sealing valve 13 is connected with the other input end of the humidification assembly 6. Air passes through the filter 1 to filter dust and impurities, the air compression assembly 2 pressurizes the air to enter the cooling assembly 3, the cooling assembly 3 cools the entering air to control the air temperature to be within a temperature range suitable for chemical reaction, and the humidification assembly 6 humidifies the dry air to a humidity suitable for participating in chemical reaction. In this process, if it is detected that the pressure of the air exceeds a certain threshold value, a part of the air is discharged through the back pressure assembly 7, so that the air participating in the chemical reaction in the electric pile 12 is in an appropriate amount.

[0067] However, when the electric pile is in a low-power working condition, the fuel cell engine needs air flow with low pressure, and the minimum operating condition of the air compressor cannot meet the use requirement. If the pressure of the air compressor needs to be met, the air flow will be large, all the air flows 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, the air inlet combination valve needs to be opened to discharge the excessive flow through the bypass path, which wastes the energy of the air compressor. In the high-power interval, in order to increase the reaction rate of the fuel cell pile, the air compressor needs to increase the operating pressure and the 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 a large amount of oxygen and energy is contained in the exhaust gas. Moreover, with the increase of the air flow and the acceleration of the reaction, the parasitic power of the air compressor increases, and the output of the fuel cell pile 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 a lot. At the same time, the volume of the intercooler and the humidifier increases, which increases the difficulty of arranging the fuel cell system, reduces the volume power density of the system, increases the pressure drop, and increases the power consumption of the air compressor.

[0068] In order to solve the problems that the air is not purified, a large amount of oxygen in the air is discharged without being used, and the background art lacks a scheme for controlling the air supply amount according to the working condition, the present application provides an oxygen supply control method of an air supply system, in which the current working condition of the fuel cell engine is determined according to the current output power and the target power of the fuel cell engine, the first target opening degree of the intake combination valve is determined after the current working condition is determined, the target rotating speed of the air compressor and the second target opening degree of the back pressure valve are determined, the target opening and closing period of the drain valve and the third target opening degree of the bypass valve are determined according to the current working condition, and finally the corresponding elements are controlled according to the target opening degree, the target rotating speed and the target opening and closing period. Therefore, by controlling the oxygen amount supplied by the air supply system according to different working conditions, the engine power load raising and lowering efficiency is ensured, the utilization rate of oxygen and catalyst is improved, the efficiency of the fuel cell engine is improved, and the cost of the fuel cell stack is reduced as a whole.

[0069] Figure 2 is a flow chart of an oxygen supply control method of an air supply system provided by an embodiment of the present application.

[0070] In this embodiment, as shown in Figure 3 , the air supply system of the present application is an air supply system of a fuel cell engine. Figure 3 is a partial structure schematic diagram of the air supply system of an embodiment of the present application.

[0071] The air supply system 20 includes a intercooler 21, an intake combination 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 with the output end of the intercooler 21, the input end of the oxygen separation membrane 23 is connected with the bypass outlet of the intake combination valve 22, the output end of the oxygen separation membrane 23 is connected with the input end of the gas-liquid separator 24, and the output end of the gas-liquid separator 24 is connected with the main path outlet of the intake combination valve 22 and the input end of the humidifier 25 respectively.

[0073] Specifically, during the operation, the pressurized air is cooled by the intercooler, then enters the front end of the oxygen separation membrane through the intake combination valve, the oxygen separation membrane has selective permeability to oxygen, due to the pressure difference between the front and rear ends, the oxygen-rich air passes through the low-pressure side (permeation side) of the oxygen separation membrane, and the nitrogen and other gases 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 member, the water vapor and other liquid impurities in the oxygen-rich air are separated by the gas-liquid separator, the dry oxygen-rich air after separation enters the humidifier, the humidifier performs humidification treatment on the dry oxygen-rich air, so that the dry oxygen-rich air becomes humidity appropriate easy reaction gas, so as to improve the reaction rate of the stack.

[0074] Further, as shown in 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 the target power of the fuel cell engine are acquired.

[0076] The current output power refers to the actual output power value of the fuel cell engine in the current working state; the target power refers to the output power value that the fuel cell engine is expected to reach under a specific working condition.

[0077] Specifically, the target power of the fuel cell engine changes with the working condition, for example, when the vehicle changes from normal driving to climbing, the power of the engine should increase accordingly, and the target power of the engine also increases accordingly. However, in actual driving, the current output power of the engine may not be able to reach the target power, so the embodiment of the present application needs to acquire the actual current output power as well as the target power.

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

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

[0080] Specifically, after acquiring the current output power and the target power of the fuel cell engine, the current working condition of the fuel cell engine is determined according to the current output power and the target power based on a predetermined judgment method. The current working condition determines the degree of power increase or decrease required by the fuel cell engine at present. Since the embodiment of the present application 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 degree of the air intake combination valve can be calculated according to the current working condition, and the opening and closing degree of the air intake combination valve is controlled according to the first target opening degree, so as to achieve the purpose of controlling the amount of oxygen supplied by the air supply system. At the same time, in order to ensure sufficient air supply in the air supply system, the target rotating speed of the air compressor and the second target opening degree of the back pressure valve also change with the first target opening degree after the opening degree of the air intake combination valve changes. At this time, due to the change of the amount of gas into the stack, the target opening and closing period of the drain valve and the third target opening degree of the bypass valve also change with the current working condition.

[0081] Further, in some embodiments, determining the current working condition of the fuel cell engine according to the current output power and the target power comprises: judging 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, determining that the current working condition is a low-power working condition; otherwise, judging 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 working condition is a loading working condition; otherwise, judging 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 working condition is a steady-state working condition; otherwise, determining that the current working condition is a load-reducing working condition.

[0082] The preset power can be a power value set by a person skilled in the art according to actual needs, or a power value obtained through a limited number of computer simulations, and is not specifically limited here.

[0083] Specifically, the embodiments of the present application can determine the current working condition of the fuel cell engine through the size relationship among 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 indicates that the target power required by the vehicle is low, and at this time, 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 further judged whether the current output power is less than the target power. If the current output power is less than the target power, it indicates that the output of the current fuel cell engine has not reached the target power, and therefore the current output power needs to be continuously increased. At this time, 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 indicates that the current output power has reached the target power requirement. When the current output power is equal to 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, and in order to avoid waste of energy, the power of the fuel cell engine needs to be reduced. At this time, the current working condition is determined to be a load-reducing working condition.

[0084] For example, the preset power is set to be 30% of the rated power. When the target power is less than or equal to the preset power, the current working condition is determined to be a low-power working condition. When the target power is greater than the preset power, and the current output power is less than the target power, the current working condition is determined to be a loading working condition. When the target power is greater than the preset power, and the current output power is equal to the target power, when the current output power is equal to the target power for more than 1s, the current working condition is determined to be a steady-state working condition. When the target power is greater than the preset power, and the current output power is greater than the target power, the current working condition is determined to be a load-reducing working condition.

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

[0086] wherein the first preset opening degree and the second preset opening degree can be the opening degree of the intake valve set by a person skilled in the art according to actual needs, or can be the opening degree of the intake valve obtained through a limited number of computer simulations, which is not specifically limited herein.

[0087] Specifically, when the current working condition is a low-power working condition, the first target opening degree is set as a first preset opening degree. Since the power of the fuel cell engine is low, oxygen entering the stack cannot be fully reacted with hydrogen in the stack and is discharged, resulting in a large waste. Therefore, the first preset opening degree of the embodiment of the present application can be set as an opening degree at which all air passes through the oxygen separation membrane and the gas-liquid separator. After the air passes through the oxygen separation membrane, only pure oxygen gas is left. The pure oxygen gas is used to participate in the chemical reaction of the stack, effectively solving the problem of energy waste and improving the efficiency of the chemical reaction. When the current working condition is a load working condition, the first target opening degree is set as a second preset opening degree. When the load working condition, the oxygen separation membrane has a delay in separating oxygen, and cannot guarantee the load speed of the fuel cell engine. Therefore, it is necessary to increase the air flow and the opening degree 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 being filtered by the oxygen separation membrane and the gas-liquid separator, thereby guaranteeing the load speed of the fuel cell. When the current working condition is a steady-state working condition, the fuel cell is continuously supplied with gas with a high oxygen concentration, thereby guaranteeing the stable operation of the stack and improving the efficiency of the chemical reaction as much as possible. When the current working condition is a steady-state working condition, the first target opening degree of the embodiment of the present application is set in the first preset opening degree interval. The upper limit value of the first preset opening degree interval is greater than the current opening degree of the intake combination valve, and the lower limit value of the first preset opening degree interval is less than the current opening degree of the intake combination valve. For example, when the current opening degree of the intake combination valve is 40%, the first preset opening degree interval can be set as 30% to 50%. When the current working condition is a load working condition, the opening degree of the intake combination valve needs to be reduced due to the reduction of the power of the fuel cell engine. At this time, the first target opening degree of the embodiment of the present application can be set in the second preset opening degree interval. The upper limit value of the second preset opening degree interval is less than the current opening degree of the intake combination valve. For example, when the current opening degree of the intake combination valve is 50%, the second preset opening degree interval is set to be less than 40%.

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

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

[0090] Specifically, the air demand value is determined by the first target opening degree of the intake combination valve, each power operating condition corresponds to an air / oxygen flow and pressure, and the calculation formula of the oxygen consumption amount when the power is stably operated is:

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

[0092] wherein, Wo 2,reacted is the oxygen consumption amount (g / s), Mo2 is the molar mass of oxygen (32 g / mol), n is the number of single cells of the electric pile, I is the electric pile current (A, i.e., the number of electric charges of electrons passing per second), F is the Faraday constant (C / mol), indicating the amount of electric charge per mole, and 4 is the number of moles of electrons generated by 1 mole of oxygen reaction. nI / (4F) represents the amount of substance of oxygen consumed per second.

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

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

[0095] The volume proportion of each component in air is: nitrogen (N2) accounts for about 78%, and oxygen (O2) accounts for about 21%. At different temperatures, the volume of oxygen in the used air 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, and at different temperatures, the amount of air passing through the intake combination valve per second at the boost operating condition (at standard conditions) is calculated as:

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

[0099] Wo2 = aMo2 * nI / (4F);

[0100] Thus, according to the above calculation formula and the air compressor MAP, the theoretical pressure at different power points is determined, the air demand value at the calculated flow is determined, and the theoretical air compressor speed and the opening degree of the back pressure valve at each working point are determined. During the steady state operation at each power point, due to the actual problems such as the flow resistance of the air path pipeline and the air filter, the back pressure of the exhaust pipeline, etc., the theoretical flow and pressure are different from the actual flow and pressure according to the pressure P 理论 , air / oxygen flow calculation value W 理论 The real-time pressure collected by the air path and the pressure P 实际 , flow W 实际 feedback by the flow sensor are taken as target values, and the relationship between the theoretical value and the actual value is calibrated:

[0101] The adjustment of the air compressor and the back pressure valve affects the flow and pressure as follows:

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

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

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

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

[0106] Further, in some embodiments, 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 comprises: obtaining a working condition-drain valve opening and closing period-bypass valve opening degree table; and 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 based on the working condition-drain valve opening and closing period-bypass valve opening degree table.

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

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

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

[0110] To make the person skilled in the art further understand the oxygen supply control method of the air supply system of the embodiment of the present application, the following will be described in detail in combination with specific embodiments.

[0111] Specifically, as shown in Figure 4 the oxygen supply control method of the air supply system, the following steps are included:

[0112] S401, the FCU sends power data and starts the fuel cell engine.

[0113] S402, the current working condition is judged, when the target power > preset power and the current output power < target power, step S403 is executed; when the target power > preset power and the current output power = target power, step S404 is executed when the target power ≤ preset power; when the target power ≤ preset power, step S405 is executed; when the target power > preset power and the current output power > target power, step S406 is executed.

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

[0115] S404, the current working condition is steady state working condition, and then step S408 is executed.

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

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

[0118] S407, the opening degree of the intake combination valve is increased, the amount of high-purity oxygen is reduced, and the load is quickly pulled.

[0119] S408, the intake combination valve reduces the opening degree as much as possible, and the amount of high-purity oxygen is increased.

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

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

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

[0123] S412, the target opening and closing period of the drain valve is calibrated, and the third target opening degree of the bypass valve is calibrated.

[0124] The oxygen supply control method of the air supply system provided by the embodiment of the present application, by judging the current working condition of the fuel cell engine according to the current output power and the target power of the fuel cell engine, after judging the current working condition, determining the first target opening degree of the intake combination valve, and determining the target speed of the air compressor and the second target opening degree of the back pressure valve, 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, finally controlling the corresponding elements according to the target opening degree, the target speed and the target opening and closing period. Therefore, by controlling the amount of oxygen supplied by the air supply system for different working conditions, the engine power load raising and lowering efficiency is guaranteed, the utilization rate of oxygen and catalyst is improved, the efficiency of the fuel cell engine is improved, and the overall fuel cell stack cost is reduced.

[0125] Secondly, the oxygen supply control device of the air supply system provided by the embodiment of the present application is described with reference to the accompanying drawings.

[0126] Figure 5 It is the block schematic diagram of the oxygen supply control device of the air supply system provided by one embodiment of the present application.

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

[0128] Among them, the acquisition module 100 is used for acquiring the current output power and the target power of the fuel cell engine.

[0129] The target determination module 200 is configured to determine a current working condition of the fuel cell engine according to the current output power and the target power, determine a first target opening degree of the intake combination valve according to the current working condition, determine a target rotating speed of the air compressor of the air supply system and a second target opening degree of the back pressure valve based on the first target opening degree, and determine 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.

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

[0131] According to an embodiment of the present application, the target determination module 200 is specifically configured to: determine 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, determine that the current working condition is a low-power working 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 working condition is a loading working 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 working condition is a steady-state working condition; otherwise, determine that the current working condition is a load shedding working condition.

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

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

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

[0135] According to one embodiment of the present application, the target determination module 200 is specifically configured to: acquire a working condition-drain valve opening and closing period-bypass valve opening table; and determine the target opening and closing period of the drain valve and the third target opening of the bypass valve according to the current working condition based on the working condition-drain valve opening and closing period-bypass valve opening table.

[0136] According to the oxygen supply control device of the air supply system provided by the embodiment of the present application, the current working condition of the fuel cell engine is determined according to the current output power and the target power of the fuel cell engine, after the current working condition is determined, the first target opening of the intake combination valve is determined, the target rotating speed of the air compressor and the second target opening of the back pressure valve are determined, the target opening and closing period 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 elements are controlled according to the target opening, the target rotating speed and the target opening and closing period. Therefore, by controlling the oxygen amount supplied by the air supply system according to different working conditions, the power loading and unloading efficiency of the engine is ensured, the utilization rate of oxygen and catalyst is improved, the efficiency of the fuel cell engine is improved, and the cost of the fuel cell stack is reduced as a whole.

[0137] Figure 6 The electronic device provided by the embodiment of the present application is shown in a structural schematic diagram. The electronic device can include:

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

[0139] The processor 602 implements the oxygen supply control method of the air supply system provided in the above embodiments when executing the program.

[0140] Further, the electronic device further includes:

[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 the computer program executable on the processor 602.

[0143] The memory 601 can include a high-speed RAM (Random Access Memory, Random Access Memory) memory, and can 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 with each other through a bus and complete communication between 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 the convenience of representation, Figure 6 Only one thick line is used to represent the bus in the figure, but it 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 complete communication between each other through an internal interface.

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

[0147] The embodiment of the present application also provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the oxygen supply control method of the air supply system.

[0148] The embodiment of the present application also provides a computer program product, which includes a computer program, and the program is executed by a processor to implement the oxygen supply control method of the air supply system.

[0149] In addition, the terms "first", "second" are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0150] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative expressions of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0151] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A method for controlling oxygen supply in an air supply system, characterized in that, An intake combination valve, an oxygen separation membrane, and a gas-liquid separator are provided between the intercooler and the humidifier in 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. The output end of the gas-liquid separator is connected to the main outlet of the intake combination valve and the input end of the humidifier, respectively. The method includes the following steps: Obtain 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, and the first target opening degree of the intake combination valve is determined based on the current operating condition. The target speed of the air compressor of the air supply system and the second target opening degree of the back pressure valve are determined based on the first target opening degree. The target opening and closing cycle of the drain valve and the third target opening degree of the bypass valve are determined based on the current operating condition. The intake combination valve is controlled according to the first target opening degree, the air compressor is controlled according to the target speed, the back pressure valve is controlled according to the second target opening degree, 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 degree. The step of determining the current operating condition of the fuel cell engine based on 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, then determining that the current operating condition is a low-power operating 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, then determining that the current operating condition is a loaded operating 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, then determining that the current operating condition is a steady-state operating condition; otherwise, determining that the current operating condition is a deloaded operating condition. The step of determining the target speed of the air compressor and the second target opening of the back pressure valve of the air supply system based on the first target opening includes: determining the air demand value based on the first target opening; and determining the target speed of the air compressor and the second target opening of the back pressure valve based on the air demand value according to the MAP of the air compressor.

2. The method according to claim 1, characterized in that, Determining the first target opening degree of the intake combination valve based on the current operating conditions includes: If the current operating condition is the low-power operating condition, then the first target opening degree is the first preset opening degree; If the current working condition is the loading working condition, then the first target opening is the 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, then the first target opening degree is within a first preset opening degree range determined by the current opening degree of the intake combination valve, wherein the lower limit of the first preset opening degree range is less than the current opening degree of the intake combination valve, and the upper limit of the first preset opening degree range is greater than the current opening degree of the intake combination valve. If the current operating condition is the load reduction condition, then the first target opening degree is within a second preset opening degree range determined by the current opening degree of the intake combination valve, wherein the upper limit of the second preset opening degree range is less than the current opening degree of the intake combination valve.

3. The method according to claim 1, characterized in that, Determining the target opening and closing cycle of the drain valve and the third target opening degree of the bypass valve based on the current operating conditions includes: Get operating conditions - drain valve opening and closing cycle - bypass valve opening table; Based on the aforementioned operating condition-drain valve opening and closing cycle-bypass valve opening degree table, the target opening and closing cycle of the drain valve and the third target opening degree of the bypass valve are determined according to the current operating condition.

4. An oxygen supply control device for an air supply system, characterized in that, An intake combination valve, an oxygen separation membrane, and a gas-liquid separator are provided between the intercooler and the humidifier in 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. The output end of the gas-liquid separator is connected to the main outlet of the intake combination valve and the input end of the humidifier, respectively. The device includes: The acquisition module is used to acquire the current output power and target power of the fuel cell engine; The target determination module is used to determine the current operating condition of the fuel cell engine based on the current output power and the target power, and to determine the first target opening degree of the intake combination valve based on the current operating condition, and to determine the target speed of the air compressor of the air supply system and the second target opening degree of the back pressure valve based on the first target opening degree, and to determine the target opening and closing cycle of the drain valve and the third target opening degree of the bypass valve based on the current operating condition. The control module is used to control the intake combination valve according to the first target opening degree, control the air compressor according to the target speed, control the back pressure valve according to the second target opening degree, control the drain valve according to the target opening and closing cycle, and control the bypass valve according to the third target opening degree. The target determination module is configured to: determine 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, determine that the current operating condition is a low-power operating 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 operating 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 operating condition; otherwise, determine that the current operating condition is a load-reducing operating condition. The target determination module is used to: determine the air demand value based on the first target opening degree; and determine the target speed of the air compressor and the second target opening degree of the back pressure valve based on the air demand value and the MAP of the air compressor.

5. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the oxygen supply control method for an air supply system as described in any one of claims 1-3.

6. A computer storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the oxygen supply control method of the air supply system as described in any one of claims 1-3.

7. A computer program product, characterized in that, Includes 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 1-3.

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