Flow control method and device of air compressor and fuel cell system

Abstract

The invention provides a flow control method and device of an air compressor and a fuel cell system.The method comprises the steps that the air compressor is controlled to operate at the preset rotating speed, and the required air mass flow, the preset power of a fuel cell, the preset power of the air compressor, the atmospheric pressure and the environment temperature are obtained; the fuel cell preset power is the power of the fuel cell of the air compressor at the preset rotating speed, and the air compressor preset power is the power of the air compressor at the preset rotating speed; the first front end piezoresistance of the air compressor is determined according to the atmospheric pressure, the environment temperature, the preset power of the air compressor and the first mapping relation; the first rear end piezoresistance of the air compressor is determined according to the atmospheric pressure, the environment temperature, the preset power of the fuel cell and the second mapping relation; and the required rotating speed of the air compressor is determined according to the first rear end piezoresistance, the first front end piezoresistance and the required air mass flow, the air compressor is controlled to operate at the required rotating speed, and the problem that in the prior art, the cost is high due to the fact that an air compressor uses a high-precision pressure sensor is solved.

Description

Technical Field

[0001] The present invention relates to the field of flow control technology, and in particular to a flow control method, device, computer program product and fuel cell system for an air compressor. Background Art

[0002] Fuel cell systems, with their high power generation efficiency and low pollution emissions, are one of the most popular energy conversion technologies currently. However, high manufacturing costs have become a key factor limiting their development.

[0003] Fuel cell systems rely on the reaction of fuel and oxygen to generate energy. Therefore, a stable fuel and oxygen supply is essential for the stable operation of the fuel cell system. As the core component of the air supply, precise flow control of the air compressor is crucial. Traditional air compressor flow control methods rely on a calibrated fuel cell air mass flow rate and pressure sensor measurements before and after the compressor, using a lookup table to calculate the flow rate and adjust the compressor speed. This method requires high pressure sensor measurement accuracy, resulting in high costs. Pressure sensors with low measurement accuracy can lead to significant deviations in calculated flow rates, potentially causing problems such as temperature runaway in the fuel cell system and an imbalance in the oxygen-to-gas ratio, directly impacting the fuel cell system's service life. Summary of the Invention

[0004] The main purpose of the present application is to provide a flow control method, device, computer program product and fuel cell system for an air compressor, so as to at least solve the problem of high cost caused by the use of high-precision pressure sensors in air compressors in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a flow control method for an air compressor is provided, wherein the air inlet of the air compressor is connected to the air filter, and the air outlet of the air compressor is connected to the fuel cell, and the method comprises: controlling the air compressor to operate at a predetermined speed, and obtaining the required air mass flow, the predetermined power of the fuel cell, the predetermined power of the air compressor, the atmospheric pressure and the ambient temperature, wherein the required air mass flow is the air mass flow required by the fuel cell under the current working condition, the predetermined power of the fuel cell is the power of the fuel cell of the air compressor at the predetermined speed, and the predetermined power of the air compressor is the power of the air compressor at the predetermined speed; determining the first speed of the air compressor according to the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor and the first mapping relationship. A front-end piezoresistor, wherein the first mapping relationship is a mapping relationship obtained by calibration using the atmospheric pressure, the ambient temperature, the power of the air compressor and the front-end piezoresistor, and the front-end piezoresistor is the piezoresistor of the pipeline at the air inlet of the air compressor; a first rear-end piezoresistor of the air compressor is determined according to the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell and the second mapping relationship, and the second mapping relationship is a mapping relationship obtained by calibration using the atmospheric pressure, the ambient temperature, the power of the fuel cell and the rear-end piezoresistor, and the rear-end piezoresistor is the piezoresistor of the pipeline at the air outlet of the air compressor; a required speed of the air compressor is determined according to the first rear-end piezoresistor, the first front-end piezoresistor and the required air mass flow rate, and the air compressor is controlled to operate at the required speed.

[0006] Optionally, the required speed of the air compressor is determined based on the first rear-end piezoresistive, the first front-end piezoresistive, and the required air mass flow rate, including: calculating the sum of the first rear-end piezoresistive and the atmospheric pressure to obtain the first rear-end pressure of the air compressor; calculating the difference between the atmospheric pressure and the first front-end piezoresistive to obtain the first front-end pressure of the air compressor; calculating the ratio of the first rear-end pressure of the air compressor to the first front-end pressure of the air compressor to obtain a first pressure ratio, the first pressure ratio being the ratio of the rear-end pressure of the air compressor to the front-end pressure of the air compressor at the predetermined speed; determining the required speed based on the first pressure ratio, the required air mass flow rate, and a third mapping relationship, the third mapping relationship being a mapping relationship among the pressure ratio, the air mass flow rate of the air compressor, and the speed of the air compressor.

[0007] Optionally, after controlling the air compressor to operate at the required speed, the method further includes: obtaining the power of the air compressor at the required speed to obtain the required power of the air compressor; determining a second pressure ratio according to the required speed, the required power of the air compressor and a fourth mapping relationship, the second pressure ratio being the ratio of the rear end pressure of the air compressor to the front end pressure of the air compressor at the required speed, the fourth mapping relationship being a mapping relationship between the pressure ratio, the power of the air compressor and the speed of the air compressor; determining a current air mass flow rate according to the required speed, the required power of the air compressor and the fifth mapping relationship The fifth mapping relationship is a mapping relationship among the air mass flow rate of the air compressor, the power of the air compressor and the speed of the air compressor; the second rear end piezoresistance of the air compressor is determined according to the atmospheric pressure, the ambient temperature, the required power of the fuel cell and the second mapping relationship, and the required power of the fuel cell is the power of the fuel cell at the required speed; the second front end piezoresistance of the air compressor is calculated according to the second rear end piezoresistance, the atmospheric pressure and the second pressure ratio; when the second front end piezoresistance is less than the piezoresistance threshold, the required speed is used as the new predetermined speed.

[0008] Optionally, after calculating the second front-end piezoresistance of the air compressor based on the second rear-end piezoresistance, the atmospheric pressure and the second pressure ratio, the method further includes: calculating the product of the second front-end piezoresistance and the air filter ratio to obtain the air filter piezoresistance of the air filter, where the air filter ratio is the ratio of the air filter piezoresistance to the front-end piezoresistance; calculating the current air volume flow corresponding to the current air mass flow based on the current air mass flow, the atmospheric pressure and the ambient temperature; determining the air filter life status of the air filter based on the current air volume flow, the air filter piezoresistance and the sixth mapping relationship, where the air filter life status is the ratio of the remaining service life to the total service life; and issuing a reminder to replace the air filter when the air filter life status is less than a predetermined threshold.

[0009] Optionally, the first front-end piezoresistor of the air compressor is determined according to the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor and the first mapping relationship, including: when the air compressor, and the connected air filter and the fuel cell are in a test space, adjusting the air pressure and temperature of the test space and the power of the air compressor, and obtaining the adjusted front-end piezoresistor of the air compressor, to obtain a first adjusted air pressure, a first adjusted temperature, an adjusted air compressor power and an adjusted front-end piezoresistor, and the test space is a space with adjustable air pressure and temperature; generating the first mapping relationship according to multiple first adjusted air pressures, corresponding first adjusted temperatures, corresponding adjusted air compressor powers and corresponding adjusted front-end piezoresistors; querying the front-end piezoresistor corresponding to the atmospheric pressure, the ambient temperature and the predetermined power of the air compressor according to the first mapping relationship to obtain the first front-end piezoresistor.

[0010] Optionally, the first rear end piezoresistor of the air compressor is determined according to the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell and the second mapping relationship, including: when the air compressor, and the connected air filter and the fuel cell are in a test space, adjusting the air pressure and temperature of the test space and the power of the fuel cell, and obtaining the adjusted rear end piezoresistor of the air compressor to obtain the second adjusted air pressure, second adjusted temperature, adjusted fuel cell power and adjusted rear end piezoresistor, and the test space is a space with adjustable air pressure and temperature; generating the second mapping relationship according to multiple second adjusted air pressures, corresponding second adjusted temperatures, corresponding adjusted fuel cell powers and corresponding adjusted rear end piezoresistances; querying the rear end piezoresistor corresponding to the atmospheric pressure, the ambient temperature and the predetermined power of the fuel cell according to the second mapping relationship to obtain the first rear end piezoresistor.

[0011] Optionally, the first front-end piezoresistor of the air compressor is determined according to the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor and the first mapping relationship, including: obtaining the usage time of the air filter; calculating the difference between the total life of the air filter and the usage time to obtain the remaining service life of the air filter; calculating the ratio of the remaining service life to the total life of the air filter to obtain the air filter life status of the air filter, and the air filter life status is the ratio of the remaining service life to the total life; calculating the required air volume flow corresponding to the required air mass flow according to the required air mass flow, the atmospheric pressure and the ambient temperature; determining the first front-end piezoresistor according to a seventh mapping relationship corresponding to the required air volume flow and the air filter life status of the air filter, and the seventh mapping relationship is a mapping relationship between air volume flow and the front-end piezoresistor.

[0012] According to another aspect of the present application, a flow control device for an air compressor is provided, wherein the air inlet of the air compressor is connected to the air filter, and the air outlet of the air compressor is connected to the fuel cell, and the device includes: an acquisition unit for controlling the air compressor to operate at a predetermined speed, and acquiring the required air mass flow, the predetermined power of the fuel cell, the predetermined power of the air compressor, the atmospheric pressure and the ambient temperature, wherein the required air mass flow is the air mass flow required by the fuel cell under the current operating conditions, the predetermined power of the fuel cell is the power of the fuel cell at the predetermined speed of the air compressor, and the predetermined power of the air compressor is the power of the air compressor at the predetermined speed; a first determination unit for determining a first front-end pressure resistance of the air compressor according to the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor and a first mapping relationship. , the first mapping relationship is a mapping relationship obtained by calibration using the atmospheric pressure, the ambient temperature, the power of the air compressor and the front-end piezoresistor, and the front-end piezoresistor is the piezoresistor of the pipeline at the air inlet of the air compressor; the second determination unit is used to determine the first rear-end piezoresistor of the air compressor according to the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell and the second mapping relationship, the second mapping relationship is a mapping relationship obtained by calibration using the atmospheric pressure, the ambient temperature, the power of the fuel cell and the rear-end piezoresistor, and the rear-end piezoresistor is the piezoresistor of the pipeline at the air outlet of the air compressor; the third determination unit is used to determine the required speed of the air compressor according to the first rear-end piezoresistor, the first front-end piezoresistor and the required air mass flow, and control the air compressor to operate at the required speed.

[0013] According to another aspect of the present application, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, any one of the methods described above is implemented.

[0014] According to another aspect of the present application, a fuel cell system is provided, comprising: a fuel cell, an air compressor, an air filter, one or more processors, a memory, and one or more programs, wherein the air inlet of the air compressor is connected to the air filter, and the air outlet of the air compressor is connected to the fuel cell, the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the methods described.

[0015] By applying the technical solution of the present application, in the flow control method of the above-mentioned air compressor, the air mass flow required by the fuel cell, the power of the fuel cell, the power of the air compressor, the atmospheric pressure and the ambient temperature are obtained by operating the air compressor at a predetermined speed, and obtaining the air mass flow, the predetermined power of the fuel cell, the predetermined power of the air compressor, the atmospheric pressure and the ambient temperature, thereby determining the first front-end piezoresistive of the air compressor according to the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor and the first mapping relationship, and determining the first rear-end piezoresistive of the air compressor according to the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell and the second mapping relationship, so as to replace the existing The technology uses a pressure sensor to detect the piezoresistance at the front and rear ends of the air compressor. Since the first mapping relationship and the second mapping relationship are calibrated, the accuracy of the first rear end piezoresistance and the first front end piezoresistance is guaranteed. The required speed of the air compressor is determined according to the first rear end piezoresistance, the first front end piezoresistance, and the required air mass flow rate, which can accurately meet the air demand of the fuel cell. Therefore, there is no need to use a high-precision pressure sensor on the air compressor to achieve precise control of oxygen supply, which can avoid the imbalance of the oxygen and gas ratio of the fuel cell, reduce the cost of the air compressor, and solve the problem of high cost caused by the use of high-precision pressure sensors in the air compressor in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for executing a flow control method for an air compressor provided in an embodiment of the present application is shown;

[0017] Figure 2 A flow chart of a flow control method for an air compressor provided in accordance with an embodiment of the present application is shown;

[0018] Figure 3 A schematic diagram of a process for pre-calibrating air filter life status data according to an embodiment of the present application is shown;

[0019] Figure 4 A schematic diagram of a process for pre-calibrating a MAP curve according to an embodiment of the present application is shown;

[0020] Figure 5 A schematic flow chart of another method for controlling flow of an air compressor according to an embodiment of the present application is shown;

[0021] Figure 6 A structural block diagram of a flow control device for an air compressor provided according to an embodiment of the present application is shown;

[0022] Figure 7 A schematic diagram of a fuel cell system provided according to an embodiment of the present application is shown.

[0023] The above drawings include the following reference numerals:

[0024] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] As introduced in the background technology, the use of high-precision pressure sensors in air compressors in the prior art results in high costs. To solve this technical problem, the embodiments of the present application provide a flow control method, device, computer program product, and fuel cell system for an air compressor.

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a flow control method of an air compressor according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1Only one is shown) a processor 102 (the processor 102 may include but is not limited to a microprocessor MCU or a programmable logic device FPGA and other processing devices) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input and output device 108 for communication functions. It will be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown.

[0031] Memory 104 can be used to store computer programs, such as application software programs and modules, such as the computer program corresponding to the air compressor flow control method in the embodiment of the present invention. Processor 102 executes the computer programs stored in memory 104 to execute various functional applications and data processing, thereby implementing the aforementioned method. Memory 104 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, memory 104 may further include memory remotely located from processor 102, which can be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof. Transmission device 106 is used to receive or transmit data via a network. Specific examples of such networks may include a wireless network provided by the mobile terminal's telecommunications provider. In one example, transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to enable communication with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0032] In this embodiment, a flow control method for an air compressor running on a mobile terminal, a computer terminal or a similar computing device is provided, wherein the air inlet of the air compressor is connected to an air filter, and the air outlet of the air compressor is connected to a fuel cell. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0033] Figure 2 FIG. 1 is a flow chart of a flow control method for an air compressor according to an embodiment of the present application. Figure 2As shown, the method includes the following steps:

[0034] Step S201, controlling the air compressor to operate at a predetermined speed, and obtaining a required air mass flow rate, a predetermined fuel cell power, a predetermined air compressor power, atmospheric pressure, and an ambient temperature, wherein the required air mass flow rate is the air mass flow rate required by the fuel cell under the current operating condition, the predetermined fuel cell power is the power of the fuel cell at the predetermined speed, and the predetermined air compressor power is the power of the air compressor at the predetermined speed;

[0035] Specifically, the air compressor is controlled to operate at a predetermined speed so that the air compressor and the fuel cell operate stably. Under this operating condition, the air mass flow required by the fuel cell under the current operating condition is obtained, the required air mass flow is obtained, the power of the fuel cell at the predetermined speed of the air compressor is obtained, the predetermined power of the fuel cell is obtained, the power of the air compressor at the predetermined speed is obtained, the predetermined power of the air compressor is obtained, and the updated atmospheric pressure and ambient temperature in the network are obtained through the cloud.

[0036] Step S202: determining a first front-end piezoresistor of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor, and a first mapping relationship, wherein the first mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the air compressor, and the front-end piezoresistor, and the front-end piezoresistor is the piezoresistor of the pipeline at the air inlet of the air compressor;

[0037] Specifically, the first mapping relationship is obtained by calibrating the historical atmospheric pressure, ambient temperature, air compressor power and front-end piezoresistive resistance, such as Figure 3 As shown, the pre-calibrated data between the atmospheric pressure, the above-mentioned ambient temperature, and the power of the above-mentioned air compressor under different air filter life states, different air filter life states correspond to different front-end piezoresistances, and the first mapping relationship can be queried according to the current atmospheric pressure, ambient temperature, and predetermined power of the air compressor to obtain the first front-end piezoresistance of the corresponding air compressor, thereby realizing the acquisition of the front-end piezoresistance of the air compressor without a pressure sensor.

[0038] Step S203: determining a first rear end piezoresistor of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell, and a second mapping relationship, wherein the second mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the fuel cell, and the rear end piezoresistor, and the rear end piezoresistor is the piezoresistor of the pipeline at the air outlet of the air compressor;

[0039] Specifically, the second mapping relationship obtained by calibrating the historical atmospheric pressure, ambient temperature, fuel cell power and rear-end piezoresistance can be used to query the second mapping relationship using the current atmospheric pressure, ambient temperature and air compressor scheduled power to obtain the corresponding first rear-end piezoresistance of the air compressor, thereby realizing the acquisition of the rear-end piezoresistance of the air compressor without a pressure sensor.

[0040] Step S204 , determining the required speed of the air compressor according to the first rear-end piezoresistor, the first front-end piezoresistor, and the required air mass flow rate, and controlling the air compressor to operate at the required speed.

[0041] Specifically, the speed of the air compressor is adjusted according to the first rear-end piezoresistive force, the first front-end piezoresistive force, and the required air mass flow rate, so that the speed of the air compressor reaches the required speed of the air compressor, meeting the needs of the fuel cell and avoiding an imbalance in the ratio of oxygen and gas in the fuel cell.

[0042] In the above-mentioned air compressor flow control method, the air compressor is operated at a predetermined speed and the air mass flow required by the fuel cell, the power of the fuel cell, the power of the air compressor, the atmospheric pressure, and the ambient temperature are obtained to obtain the required air mass flow, the predetermined fuel cell power, the predetermined air compressor power, the atmospheric pressure, and the ambient temperature. The first front-end piezoresistance of the air compressor is determined based on the atmospheric pressure, the ambient temperature, the predetermined air compressor power, and the first mapping relationship, and the first rear-end piezoresistance of the air compressor is determined based on the atmospheric pressure, the ambient temperature, the predetermined fuel cell power, and the second mapping relationship. This replaces the use of pressure sensors to detect the front and rear end piezoresistances of the air compressor in the prior art. Since the first mapping relationship and the second mapping relationship are calibrated, the accuracy of the first rear-end piezoresistance and the first front-end piezoresistance is guaranteed. Therefore, the required speed of the air compressor determined based on the first rear-end piezoresistance, the first front-end piezoresistance, and the required air mass flow can accurately meet the air demand of the fuel cell. Therefore, an imbalance in the oxygen-to-gas ratio of the fuel cell can be avoided without using a high-precision pressure sensor on the air compressor to achieve precise control of the oxygen supply, thereby reducing the cost of the air compressor and solving the problem of high cost caused by the use of high-precision pressure sensors in the prior art.

[0043] In order to avoid an imbalance in the ratio of oxygen to fuel gas in the fuel cell, in an optional embodiment, the above step S204 includes:

[0044] Step S2041, calculating the sum of the first rear end piezoresistance and the atmospheric pressure to obtain the first rear end pressure of the air compressor;

[0045] Step S2042, calculating the difference between the atmospheric pressure and the first front-end piezoresistive pressure to obtain the first front-end pressure of the air compressor;

[0046] Step S2043, calculating a ratio of a first rear end pressure of the air compressor to a first front end pressure of the air compressor to obtain a first pressure ratio, wherein the first pressure ratio is a ratio of the rear end pressure of the air compressor to the front end pressure of the air compressor at the predetermined speed;

[0047] Step S2044: determining the required speed according to the first pressure ratio, the required air mass flow rate, and a third mapping relationship, where the third mapping relationship is a mapping relationship among the pressure ratio, the air mass flow rate of the air compressor, and the speed of the air compressor.

[0048] In the above embodiment, since the value of the pressure ratio = (pressure resistance at the rear end of the air compressor + atmospheric pressure) / (atmospheric pressure - pressure resistance at the front end of the air compressor), the corresponding first pressure ratio can be calculated according to the first rear end pressure and the first front end pressure of the air compressor. The above-mentioned required speed can be accurately obtained by querying the third mapping relationship (air compressor MAP curve) based on the first pressure ratio and the above-mentioned required air mass flow rate, thereby avoiding an imbalance in the ratio of oxygen and gas in the fuel cell. The air compressor MAP curve is as follows: Figure 4 As shown, with air mass flow and pressure ratio as coordinates, it includes multiple equal power lines and multiple equal speed lines.

[0049] In order to continuously meet the oxygen supply demand of the fuel cell, in an optional embodiment, after controlling the air compressor to operate at the required speed, the method further includes:

[0050] Step S301, obtaining the power of the air compressor at the required speed to obtain the required power of the air compressor;

[0051] Step S302: Determine a second pressure ratio based on the required speed, the required power of the air compressor, and a fourth mapping relationship, where the second pressure ratio is a ratio of the rear pressure of the air compressor to the front pressure of the air compressor at the required speed. The fourth mapping relationship is a mapping relationship between the pressure ratio, the power of the air compressor, and the speed of the air compressor.

[0052] Step S303: determining the current air mass flow rate based on the required speed, the required power of the air compressor, and a fifth mapping relationship, wherein the fifth mapping relationship is a mapping relationship between the air mass flow rate of the air compressor, the power of the air compressor, and the speed of the air compressor;

[0053] Step S304, determining the second rear end piezoresistive of the air compressor according to the atmospheric pressure, the ambient temperature, the required power of the fuel cell, and the second mapping relationship, where the required power of the fuel cell is the power of the fuel cell at the required speed;

[0054] Step S305, calculating a second front-end piezoresistive value of the air compressor according to the second rear-end piezoresistive value, the atmospheric pressure, and the second pressure ratio;

[0055] Step S306 : When the second front-end piezoresistive resistance is less than the piezoresistive resistance threshold, the required rotational speed is used as the new predetermined rotational speed.

[0056] In the above embodiment, the power of the air compressor at the above required speed is obtained to obtain the required power of the air compressor. According to the required power of the air compressor and the required speed of the air compressor, the current air mass flow and the second pressure ratio under the corresponding operating conditions are found with reference to the air compressor MAP curve at the corresponding atmospheric pressure and ambient temperature. According to the atmospheric pressure, ambient temperature, air flow, and required power of the fuel cell, the second rear end piezoresistive of the air compressor is calculated with reference to the pre-calibrated data. The second front end piezoresistive of the air compressor is calculated (front end piezoresistive of the air compressor = atmospheric pressure - (rear end piezoresistive of the air compressor + atmospheric pressure) / pressure ratio). If the second front end piezoresistive is greater than or equal to the piezoresistive threshold, the air filter needs to be replaced. If the second front end piezoresistive is less than the piezoresistive threshold, the above required speed is used as the new predetermined speed, and the above steps are repeated to continuously meet the oxygen supply demand of the fuel cell.

[0057] In order to ensure timely replacement of the air filter, in an optional embodiment, after calculating the second front-end piezoresistive of the air compressor based on the second rear-end piezoresistive, the atmospheric pressure, and the second pressure ratio, the method further includes:

[0058] Step S401, calculating the product of the second front-end piezoresistance and the air filter ratio to obtain the air filter piezoresistance of the air filter, where the air filter ratio is the ratio of the air filter piezoresistance to the front-end piezoresistance;

[0059] Step S402, calculating the current air volume flow corresponding to the current air mass flow according to the current air mass flow, the atmospheric pressure and the ambient temperature;

[0060] Step S403, determining the air filter life state of the air filter based on the current air volume flow rate, the air filter piezoresistive resistance, and a sixth mapping relationship, where the air filter life state is the ratio of the remaining service life to the total service life;

[0061] Step S404: When the air filter life state is less than a predetermined threshold, a reminder to replace the air filter is issued.

[0062] In the above embodiment, the air filter piezoresistance is calculated based on the piezoresistance of the front-end pipeline of the air compressor (air filter piezoresistance = κ·piezoresistance of the front-end pipeline of the air compressor) (κ is the ratio of the air filter piezoresistance to the piezoresistance of the front-end pipeline of the air compressor), and the current air volume flow corresponding to the above current air mass flow is calculated based on the above current air mass flow, the above atmospheric pressure and the above ambient temperature, and then the air filter life status is output based on the current air volume flow and the air filter piezoresistance with reference to the preset value, air volume flow rate = QRT / MP, Q is the required air mass flow rate, R is the gas constant, i.e. 8.314 J / (mol*k), T is the ambient temperature, M is the molecular weight of air, i.e. 0.02896 kg / mol, and P is the atmospheric pressure. If the above air filter life status is less than a predetermined threshold, a reminder to replace the above air filter is issued.

[0063] In order to detect the front-end piezoresistive without a pressure sensor, in an optional implementation, the above step S202 includes:

[0064] Step S2021: With the air compressor, the connected air filter, and the fuel cell in a test space, adjusting the air pressure and temperature of the test space and the power of the air compressor, and obtaining the adjusted front-end piezoresistive value of the air compressor to obtain a first adjusted air pressure, a first adjusted temperature, an adjusted air compressor power, and an adjusted front-end piezoresistive value. The test space is a space with adjustable air pressure and temperature.

[0065] Step S2022, generating the first mapping relationship according to a plurality of first adjusted air pressures, the corresponding first adjusted temperatures, the corresponding adjusted air compressor powers, and the corresponding adjusted front-end piezoresistances;

[0066] Step S2023 , querying the front-end piezoresistor corresponding to the atmospheric pressure, the ambient temperature, and the predetermined power of the air compressor according to the first mapping relationship to obtain the first front-end piezoresistor.

[0067] In the above embodiment, the air compressor, and the connected air filter and fuel cell are set in a test space to adjust the atmospheric pressure, ambient temperature and the power of the air compressor to obtain the front-end piezoresistive of the adjusted air compressor, thereby obtaining a plurality of first adjusted air pressures, corresponding first adjusted temperatures, corresponding adjusted air compressor powers and corresponding adjusted front-end piezoresistances as calibration data, and generating a first mapping relationship. The front-end piezoresistive corresponding to the atmospheric pressure, the ambient temperature and the predetermined power of the air compressor can be queried according to the first mapping relationship to obtain the first front-end piezoresistive.

[0068] In order to detect the rear-end piezoresistive without a pressure sensor, in an optional implementation, the above step S203 includes:

[0069] Step S2031: With the air compressor, the connected air filter, and the fuel cell in a test space, adjusting the air pressure and temperature of the test space and the power of the fuel cell, and obtaining the adjusted rear end piezoresistance of the air compressor to obtain a second adjusted air pressure, a second adjusted temperature, an adjusted fuel cell power, and an adjusted rear end piezoresistance. The test space is a space with adjustable air pressure and temperature.

[0070] Step S2032, generating the second mapping relationship according to a plurality of second adjusted gas pressures, the corresponding second adjusted temperatures, the corresponding adjusted fuel cell powers, and the corresponding adjusted rear-end piezoresistances;

[0071] Step S2033 , querying the rear end piezoresistance corresponding to the atmospheric pressure, the ambient temperature, and the predetermined power of the fuel cell according to the second mapping relationship to obtain the first rear end piezoresistance.

[0072] In the above embodiment, the air compressor, and the connected air filter and fuel cell are set in a test space to adjust the atmospheric pressure, ambient temperature and fuel cell power, and obtain the adjusted rear end piezoresistance of the air compressor, thereby obtaining multiple second adjusted air pressures, corresponding second adjusted temperatures, corresponding adjusted fuel cell powers and corresponding adjusted rear end piezoresistances as calibration data, and generating a first mapping relationship. The rear end piezoresistance corresponding to the atmospheric pressure, the ambient temperature and the predetermined power of the fuel cell can be queried according to the first mapping relationship to obtain the first rear end piezoresistance.

[0073] In order to detect the front-end piezoresistive without a pressure sensor, in an optional implementation, the above step S202 includes:

[0074] Step S2024, obtaining the usage time of the air filter;

[0075] Step S2025, calculating the difference between the total life of the air filter and the usage time to obtain the remaining service life of the air filter;

[0076] Step S2026, calculating the ratio of the remaining service life to the total service life of the air filter to obtain the air filter life status of the air filter, where the air filter life status is the ratio of the remaining service life to the total service life;

[0077] Step S2027, calculating the required air volume flow corresponding to the required air mass flow according to the required air mass flow, the atmospheric pressure and the ambient temperature;

[0078] Step S2028: determining the first front-end piezoresistive according to a seventh mapping relationship between the required air volume flow rate and the air filter life status of the air filter, wherein the seventh mapping relationship is a mapping relationship between the air volume flow rate and the front-end piezoresistive.

[0079] In the above implementation mode, the air filter life status of the air filter is estimated based on the usage time of the above air filter, and then the required air volume flow corresponding to the above required air mass flow can be calculated based on the above required air mass flow, the above atmospheric pressure and the above ambient temperature. The air volume flow and front-end piezoresistor under the air filter life status of different air filters are calibrated to obtain the seventh mapping relationship. By querying the seventh mapping relationship corresponding to the air filter life status, the first front-end piezoresistor corresponding to the required air volume flow can be determined. Compared with calibrating the first mapping relationship, this method involves less data and a smaller calibration workload, but there is a gap in the accuracy of determining the first front-end piezoresistor compared to the first mapping relationship.

[0080] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the flow control method of the air compressor of the present application will be described in detail below with reference to specific embodiments.

[0081] This embodiment relates to a specific flow control method for an air compressor, such as Figure 5 As shown, the following steps are included:

[0082] Step S1: After the fuel cell system is started, the air compressor is controlled to run at a predetermined speed, and the required air mass flow, fuel cell power, air compressor power, atmospheric pressure and ambient temperature are obtained;

[0083] Step S2: Determine the front-end piezoresistive of the air compressor based on the atmospheric pressure, the ambient temperature, the air compressor power, and the calibrated first mapping relationship. If the front-end piezoresistive of the air compressor is less than a piezoresistive threshold, the system is shut down and the air filter is replaced.

[0084] Step S3: If yes, the rear end pressure resistance of the air compressor can be determined according to the atmospheric pressure, the ambient temperature, the fuel cell power and the calibrated second mapping relationship;

[0085] Step S4: determining a required speed of the air compressor according to the first rear-end piezoresistor, the first front-end piezoresistor, and the required air mass flow rate, and controlling the air compressor to operate at the required speed;

[0086] Step S5: If the system needs to continue to operate, the air compressor front-end pressure resistance and air filter life status are calculated based on the air compressor power, ambient temperature, atmospheric pressure, required speed, fuel cell power, and reference to pre-calibrated data, and the above steps are repeated.

[0087] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0088] The embodiment of the present application also provides a flow control device for an air compressor. It should be noted that the flow control device for an air compressor in the embodiment of the present application can be used to execute the flow control method for an air compressor provided in the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation methods, and those that have been explained will not be repeated here. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and conceivable.

[0089] The flow control device of the air compressor provided in the embodiment of the present application is introduced below. The air inlet of the air compressor is connected to the air filter, and the air outlet of the air compressor is connected to the fuel cell.

[0090] Figure 6 FIG is a structural block diagram of a flow control device for an air compressor according to an embodiment of the present application. Figure 6 As shown, the device includes:

[0091] an acquisition unit 10, configured to control the air compressor to operate at a predetermined speed and acquire a required air mass flow rate, a predetermined fuel cell power, a predetermined air compressor power, atmospheric pressure, and an ambient temperature, wherein the required air mass flow rate is the air mass flow rate required by the fuel cell under the current operating condition, the predetermined fuel cell power is the power of the fuel cell at the predetermined speed, and the predetermined air compressor power is the power of the air compressor at the predetermined speed;

[0092] a first determining unit 20, configured to determine a first front-end piezoresistive of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor, and a first mapping relationship, wherein the first mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the air compressor, and the front-end piezoresistive, and the front-end piezoresistive is the piezoresistive of the pipeline at the air inlet of the air compressor;

[0093] a second determining unit 30, configured to determine a first rear end piezoresistive value of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell, and a second mapping relationship, wherein the second mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the fuel cell, and the rear end piezoresistive value, and the rear end piezoresistive value is the piezoresistive value of the pipeline at the air outlet of the air compressor;

[0094] The third determining unit 40 is configured to determine a required speed of the air compressor according to the first rear-end piezoresistive value, the first front-end piezoresistive value, and the required air mass flow rate, and control the air compressor to operate at the required speed.

[0095] In the above-mentioned flow control device of the air compressor, the air mass flow rate required by the fuel cell, the power of the fuel cell, the power of the air compressor, the atmospheric pressure, and the ambient temperature are obtained by operating the air compressor at a predetermined speed and obtaining the air mass flow rate, the predetermined power of the fuel cell, the predetermined power of the air compressor, the atmospheric pressure, and the ambient temperature. The first front-end piezoresistance of the air compressor is determined based on the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor, and the first mapping relationship, and the first rear-end piezoresistance of the air compressor is determined based on the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell, and the second mapping relationship, thereby replacing the use of pressure sensors in the prior art to detect the front and rear end piezoresistances of the air compressor. Since the first mapping relationship and the second mapping relationship are calibrated, the accuracy of the first rear-end piezoresistance and the first front-end piezoresistance is guaranteed. Therefore, the required speed of the air compressor determined based on the first rear-end piezoresistance, the first front-end piezoresistance, and the required air mass flow rate can accurately meet the air demand of the fuel cell. Therefore, there is no need to use a high-precision pressure sensor on the air compressor to achieve precise control of the oxygen supply, thereby avoiding an imbalance in the oxygen-to-gas ratio of the fuel cell, reducing the cost of the air compressor, and solving the problem of high cost caused by the use of high-precision pressure sensors in the prior art.

[0096] In order to avoid an imbalance in the ratio of oxygen to fuel gas in the fuel cell, in an optional embodiment, the third determining unit includes:

[0097] a first calculation module, configured to calculate the sum of the first rear end piezoresistance and the atmospheric pressure to obtain a first rear end pressure of the air compressor;

[0098] a second calculation module, configured to calculate the difference between the atmospheric pressure and the first front-end piezoresistive pressure to obtain a first front-end pressure of the air compressor;

[0099] a third calculation module, configured to calculate a ratio of a first rear end pressure of the air compressor to a first front end pressure of the air compressor to obtain a first pressure ratio, wherein the first pressure ratio is a ratio of the rear end pressure of the air compressor to the front end pressure of the air compressor at the predetermined speed;

[0100] The first determination module is used to determine the required speed according to the first pressure ratio, the required air mass flow rate and a third mapping relationship, where the third mapping relationship is a mapping relationship between the pressure ratio, the air mass flow rate of the air compressor and the speed of the air compressor.

[0101] In the above embodiment, since the value of the pressure ratio = (pressure resistance at the rear end of the air compressor + atmospheric pressure) / (atmospheric pressure - pressure resistance at the front end of the air compressor), the corresponding first pressure ratio can be calculated according to the first rear end pressure and the first front end pressure of the air compressor. The above-mentioned required speed can be accurately obtained by querying the third mapping relationship (air compressor MAP curve) based on the first pressure ratio and the above-mentioned required air mass flow rate, thereby avoiding an imbalance in the ratio of oxygen and gas in the fuel cell. The air compressor MAP curve is as follows: Figure 4 As shown, with air mass flow and pressure ratio as coordinates, it includes multiple equal power lines and multiple equal speed lines.

[0102] In order to continuously meet the oxygen supply demand of the fuel cell, in an optional embodiment, the above device further includes:

[0103] an acquisition unit, configured to acquire the power of the air compressor at the required speed after controlling the air compressor to operate at the required speed, thereby obtaining the required power of the air compressor;

[0104] a fourth determining unit, configured to determine a second pressure ratio based on the required speed, the required power of the air compressor, and a fourth mapping relationship, wherein the second pressure ratio is a ratio of the rear end pressure of the air compressor to the front end pressure of the air compressor at the required speed, and the fourth mapping relationship is a mapping relationship between the pressure ratio, the power of the air compressor, and the speed of the air compressor;

[0105] a fifth determining unit, configured to determine a current air mass flow rate based on the required speed, the required power of the air compressor, and a fifth mapping relationship, wherein the fifth mapping relationship is a mapping relationship between the air mass flow rate of the air compressor, the power of the air compressor, and the speed of the air compressor;

[0106] a sixth determining unit, configured to determine a second rear end piezoresistive of the air compressor according to the atmospheric pressure, the ambient temperature, the required power of the fuel cell, and the second mapping relationship, wherein the required power of the fuel cell is the power of the fuel cell at the required speed;

[0107] a first calculation unit, configured to calculate a second front-end piezoresistive force of the air compressor according to the second rear-end piezoresistive force, the atmospheric pressure, and the second pressure ratio;

[0108] The seventh determining unit is configured to use the required rotational speed as the new predetermined rotational speed when the second front-end piezoresistive resistance is less than a piezoresistive threshold.

[0109] In the above embodiment, the power of the air compressor at the above required speed is obtained to obtain the required power of the air compressor. According to the required power of the air compressor and the required speed of the air compressor, the current air mass flow and the second pressure ratio under the corresponding operating conditions are found with reference to the air compressor MAP curve at the corresponding atmospheric pressure and ambient temperature. According to the atmospheric pressure, ambient temperature, air flow, and required power of the fuel cell, the second rear end piezoresistive of the air compressor is calculated with reference to the pre-calibrated data. The second front end piezoresistive of the air compressor is calculated (front end piezoresistive of the air compressor = atmospheric pressure - (rear end piezoresistive of the air compressor + atmospheric pressure) / pressure ratio). If the second front end piezoresistive is greater than or equal to the piezoresistive threshold, the air filter needs to be replaced. If the second front end piezoresistive is less than the piezoresistive threshold, the above required speed is used as the new predetermined speed, and the above steps are repeated to continuously meet the oxygen supply demand of the fuel cell.

[0110] In order to ensure timely replacement of the air filter, in an optional embodiment, the above device further includes:

[0111] a second calculating unit for calculating, after obtaining a second front-end piezoresistance of the air compressor based on the second rear-end piezoresistance, the atmospheric pressure, and the second pressure ratio, multiplying the second front-end piezoresistance by an air filter ratio to obtain an air filter piezoresistance of the air filter, where the air filter ratio is a ratio of the air filter piezoresistance to the front-end piezoresistance;

[0112] a third calculation unit, configured to calculate a current air volume flow rate corresponding to the current air mass flow rate according to the current air mass flow rate, the atmospheric pressure, and the ambient temperature;

[0113] an eighth determining unit, configured to determine an air filter life state of the air filter according to the current air volume flow rate, the air filter piezoresistive resistance, and a sixth mapping relationship, the air filter life state being a ratio of the remaining service life to the total service life;

[0114] The sending unit is used to send a reminder to replace the air filter when the air filter life status is less than a predetermined threshold.

[0115] In the above embodiment, the air filter piezoresistance is calculated based on the piezoresistance of the front-end pipeline of the air compressor (air filter piezoresistance = κ·piezoresistance of the front-end pipeline of the air compressor) (κ is the ratio of the air filter piezoresistance to the piezoresistance of the front-end pipeline of the air compressor), and the current air volume flow corresponding to the above current air mass flow is calculated based on the above current air mass flow, the above atmospheric pressure and the above ambient temperature, and then the air filter life status is output based on the current air volume flow and the air filter piezoresistance with reference to the preset value, air volume flow rate = QRT / MP, Q is the required air mass flow rate, R is the gas constant, i.e. 8.314 J / (mol*k), T is the ambient temperature, M is the molecular weight of air, i.e. 0.02896 kg / mol, and P is the atmospheric pressure. If the above air filter life status is less than a predetermined threshold, a reminder to replace the above air filter is issued.

[0116] In order to detect the front-end piezoresistive without a pressure sensor, in an optional implementation manner, the first determining unit includes:

[0117] a first adjustment module, configured to adjust the air pressure and temperature of the test space and the power of the air compressor when the air compressor, and the connected air filter and fuel cell are in the test space, and obtain the adjusted front-end piezoresistive value of the air compressor to obtain a first adjusted air pressure, a first adjusted temperature, an adjusted air compressor power, and an adjusted front-end piezoresistive value, wherein the test space is a space with adjustable air pressure and temperature;

[0118] A first generating module, configured to generate the first mapping relationship according to a plurality of first adjusted air pressures, the corresponding first adjusted temperatures, the corresponding adjusted air compressor powers, and the corresponding adjusted front-end piezoresistances;

[0119] The first query module is configured to query the front-end piezoresistor corresponding to the atmospheric pressure, the ambient temperature, and the predetermined power of the air compressor according to the first mapping relationship to obtain the first front-end piezoresistor.

[0120] In the above embodiment, the air compressor, and the connected air filter and fuel cell are set in a test space to adjust the atmospheric pressure, ambient temperature and the power of the air compressor to obtain the front-end piezoresistive of the adjusted air compressor, thereby obtaining a plurality of first adjusted air pressures, corresponding first adjusted temperatures, corresponding adjusted air compressor powers and corresponding adjusted front-end piezoresistances as calibration data, and generating a first mapping relationship. The front-end piezoresistive corresponding to the atmospheric pressure, the ambient temperature and the predetermined power of the air compressor can be queried according to the first mapping relationship to obtain the first front-end piezoresistive.

[0121] In order to detect the rear-end piezoresistive without a pressure sensor, in an optional implementation manner, the second determining unit includes:

[0122] a second adjustment module for adjusting the air pressure and temperature of the test space and the power of the fuel cell when the air compressor, the connected air filter, and the fuel cell are in the test space, and obtaining the adjusted rear end piezoresistance of the air compressor to obtain a second adjusted air pressure, a second adjusted temperature, an adjusted fuel cell power, and an adjusted rear end piezoresistance, wherein the test space is a space with adjustable air pressure and temperature;

[0123] a second generating module, configured to generate the second mapping relationship according to a plurality of second adjusted gas pressures, the corresponding second adjusted temperatures, the corresponding adjusted fuel cell powers, and the corresponding adjusted rear-end piezoresistance;

[0124] The second query module is configured to query the rear end piezoresistor corresponding to the atmospheric pressure, the ambient temperature and the predetermined power of the fuel cell according to the second mapping relationship to obtain the first rear end piezoresistor.

[0125] In the above embodiment, the air compressor, and the connected air filter and fuel cell are set in a test space to adjust the atmospheric pressure, ambient temperature and fuel cell power, and obtain the adjusted rear end piezoresistance of the air compressor, thereby obtaining multiple second adjusted air pressures, corresponding second adjusted temperatures, corresponding adjusted fuel cell powers and corresponding adjusted rear end piezoresistances as calibration data, and generating a first mapping relationship. The rear end piezoresistance corresponding to the atmospheric pressure, the ambient temperature and the predetermined power of the fuel cell can be queried according to the first mapping relationship to obtain the first rear end piezoresistance.

[0126] In order to detect the front-end piezoresistive without a pressure sensor, in an optional implementation manner, the first determining unit includes:

[0127] An acquisition module is used to obtain the usage time of the air filter;

[0128] a fourth calculation module, configured to calculate the difference between the total life of the air filter and the usage time to obtain the remaining service life of the air filter;

[0129] a fifth calculation module, configured to calculate a ratio of the remaining service life to the total service life of the air filter, to obtain an air filter life status of the air filter, wherein the air filter life status is a ratio of the remaining service life to the total service life;

[0130] a sixth calculation module, configured to calculate a required air volume flow rate corresponding to the required air mass flow rate according to the required air mass flow rate, the atmospheric pressure, and the ambient temperature;

[0131] The second determination module is used to determine the first front-end piezoresistor according to a seventh mapping relationship corresponding to the required air volume flow and the air filter life status of the air filter, where the seventh mapping relationship is a mapping relationship between the air volume flow and the front-end piezoresistor.

[0132] In the above implementation mode, the air filter life status of the air filter is estimated based on the usage time of the above air filter, and then the required air volume flow corresponding to the above required air mass flow can be calculated based on the above required air mass flow, the above atmospheric pressure and the above ambient temperature. The air volume flow and front-end piezoresistor under the air filter life status of different air filters are calibrated to obtain the seventh mapping relationship. By querying the seventh mapping relationship corresponding to the air filter life status, the first front-end piezoresistor corresponding to the required air volume flow can be determined. Compared with calibrating the first mapping relationship, this method involves less data and a smaller calibration workload, but there is a gap in the accuracy of determining the first front-end piezoresistor compared to the first mapping relationship.

[0133] The flow control device for an air compressor includes a processor and a memory. The acquisition unit, first determination unit, second determination unit, and third determination unit are stored in the memory as program units. The processor executes the program units stored in the memory to implement the corresponding functions. The modules are all located in the same processor; alternatively, the modules may be located in different processors in any combination.

[0134] The processor includes a core, which retrieves the corresponding program unit from the memory. One or more cores can be set, and the problem of high cost caused by the use of high-precision pressure sensors in air compressors in the prior art can be solved by adjusting the core parameters.

[0135] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0136] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program. When the program is executed, the device where the computer-readable storage medium is located is controlled to execute the flow control method for the air compressor.

[0137] Specifically, the flow control method of the air compressor includes:

[0138] Step S201, controlling the air compressor to operate at a predetermined speed, and obtaining a required air mass flow rate, a predetermined fuel cell power, a predetermined air compressor power, atmospheric pressure, and an ambient temperature, wherein the required air mass flow rate is the air mass flow rate required by the fuel cell under the current operating condition, the predetermined fuel cell power is the power of the fuel cell at the predetermined speed, and the predetermined air compressor power is the power of the air compressor at the predetermined speed;

[0139] Step S202: determining a first front-end piezoresistor of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor, and a first mapping relationship, wherein the first mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the air compressor, and the front-end piezoresistor, and the front-end piezoresistor is the piezoresistor of the pipeline at the air inlet of the air compressor;

[0140] Step S203: determining a first rear end piezoresistor of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell, and a second mapping relationship, wherein the second mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the fuel cell, and the rear end piezoresistor, and the rear end piezoresistor is the piezoresistor of the pipeline at the air outlet of the air compressor;

[0141] Step S204 , determining the required speed of the air compressor according to the first rear-end piezoresistor, the first front-end piezoresistor, and the required air mass flow rate, and controlling the air compressor to operate at the required speed.

[0142] An embodiment of the present invention provides a processor, which is used to run a program, wherein the flow control method of the air compressor is executed when the program is run.

[0143] Specifically, the flow control method of the air compressor includes:

[0144] Step S201, controlling the air compressor to operate at a predetermined speed, and obtaining a required air mass flow rate, a predetermined fuel cell power, a predetermined air compressor power, atmospheric pressure, and an ambient temperature, wherein the required air mass flow rate is the air mass flow rate required by the fuel cell under the current operating condition, the predetermined fuel cell power is the power of the fuel cell at the predetermined speed, and the predetermined air compressor power is the power of the air compressor at the predetermined speed;

[0145] Step S202: determining a first front-end piezoresistor of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor, and a first mapping relationship, wherein the first mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the air compressor, and the front-end piezoresistor, and the front-end piezoresistor is the piezoresistor of the pipeline at the air inlet of the air compressor;

[0146] Step S203: determining a first rear end piezoresistor of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell, and a second mapping relationship, wherein the second mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the fuel cell, and the rear end piezoresistor, and the rear end piezoresistor is the piezoresistor of the pipeline at the air outlet of the air compressor;

[0147] Step S204 , determining the required speed of the air compressor according to the first rear-end piezoresistor, the first front-end piezoresistor, and the required air mass flow rate, and controlling the air compressor to operate at the required speed.

[0148] An embodiment of the present invention provides a fuel cell system, such as Figure 7 As shown, the fuel cell system includes: a fuel cell, an air compressor, an air filter, an air compressor controller, a flow meter, a regulating valve, one or more processors, a memory, and one or more programs, wherein the air inlet of the air compressor is connected to the air filter, the air compressor controller can obtain cloud weather data to control the speed of the air compressor, the flow meter is used to measure the flow rate of fuel supplied by the fuel source, and thus adjust the opening of the regulating valve according to the measured value to control the flow rate of the fuel, the air outlet of the air compressor is connected to the fuel cell, and the one or more programs are stored in the memory and are configured to be executed by the one or more processors. When the processor executes the program, at least the following steps are implemented:

[0149] Step S201, controlling the air compressor to operate at a predetermined speed, and obtaining a required air mass flow rate, a predetermined fuel cell power, a predetermined air compressor power, atmospheric pressure, and an ambient temperature, wherein the required air mass flow rate is the air mass flow rate required by the fuel cell under the current operating condition, the predetermined fuel cell power is the power of the fuel cell at the predetermined speed, and the predetermined air compressor power is the power of the air compressor at the predetermined speed;

[0150] Step S202: determining a first front-end piezoresistor of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor, and a first mapping relationship, wherein the first mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the air compressor, and the front-end piezoresistor, and the front-end piezoresistor is the piezoresistor of the pipeline at the air inlet of the air compressor;

[0151] Step S203: determining a first rear end piezoresistor of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell, and a second mapping relationship, wherein the second mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the fuel cell, and the rear end piezoresistor, and the rear end piezoresistor is the piezoresistor of the pipeline at the air outlet of the air compressor;

[0152] Step S204 , determining the required speed of the air compressor according to the first rear-end piezoresistor, the first front-end piezoresistor, and the required air mass flow rate, and controlling the air compressor to operate at the required speed.

[0153] The present application also provides a computer program product, which, when executed on a data processing device, is adapted to execute a program for initializing at least the following method steps:

[0154] Step S201, controlling the air compressor to operate at a predetermined speed, and obtaining a required air mass flow rate, a predetermined fuel cell power, a predetermined air compressor power, atmospheric pressure, and an ambient temperature, wherein the required air mass flow rate is the air mass flow rate required by the fuel cell under the current operating condition, the predetermined fuel cell power is the power of the fuel cell at the predetermined speed, and the predetermined air compressor power is the power of the air compressor at the predetermined speed;

[0155] Step S202: determining a first front-end piezoresistor of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor, and a first mapping relationship, wherein the first mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the air compressor, and the front-end piezoresistor, and the front-end piezoresistor is the piezoresistor of the pipeline at the air inlet of the air compressor;

[0156] Step S203: determining a first rear end piezoresistor of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell, and a second mapping relationship, wherein the second mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the fuel cell, and the rear end piezoresistor, and the rear end piezoresistor is the piezoresistor of the pipeline at the air outlet of the air compressor;

[0157] Step S204 , determining the required speed of the air compressor according to the first rear-end piezoresistor, the first front-end piezoresistor, and the required air mass flow rate, and controlling the air compressor to operate at the required speed.

[0158] Obviously, those skilled in the art will appreciate that the various modules or steps of the present invention described above can be implemented using a general-purpose computing device, can be centralized on a single computing device, or can be distributed across a network of multiple computing devices. They can be implemented using program code executable by the computing device, and thus, can be stored in a storage device and executed by the computing device. In some cases, the steps shown or described herein can be performed in a different order than that shown, or can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0159] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0160] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0161] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0162] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0163] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0164] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0165] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0166] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0167] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0168] 1) In the flow control method for an air compressor of the present application, the air mass flow rate required by the fuel cell, the power of the fuel cell, the power of the air compressor, the atmospheric pressure, and the ambient temperature are obtained by operating the air compressor at a predetermined speed and obtaining the air mass flow rate, the predetermined fuel cell power, the predetermined air compressor power, the atmospheric pressure, and the ambient temperature. The air compressor's first front-end piezoresistance is determined based on the atmospheric pressure, the ambient temperature, the predetermined air compressor power, and a first mapping relationship, and the air compressor's first rear-end piezoresistance is determined based on the atmospheric pressure, the ambient temperature, the predetermined fuel cell power, and a second mapping relationship. This replaces the prior art method of using a pressure sensor to detect the front and rear end piezoresistances of the air compressor. Because the first mapping relationship and the second mapping relationship are calibrated, the accuracy of the first rear-end piezoresistance and the first front-end piezoresistance is ensured. Determining the required speed of the air compressor based on the first rear-end piezoresistance, the first front-end piezoresistance, and the required air mass flow rate can accurately meet the air demand of the fuel cell. This eliminates the need for a high-precision pressure sensor on the air compressor to achieve precise oxygen supply control, thereby avoiding an imbalance in the oxygen-to-gas ratio of the fuel cell. This reduces the cost of the air compressor and solves the problem of high cost caused by the use of high-precision pressure sensors in the prior art.

[0169] 2) In the flow control device of the air compressor of the present application, the air mass flow rate required by the fuel cell, the power of the fuel cell, the power of the air compressor, the atmospheric pressure, and the ambient temperature are obtained by operating the air compressor at a predetermined speed and obtaining the air mass flow rate, the predetermined fuel cell power, the predetermined air compressor power, the atmospheric pressure, and the ambient temperature. The air compressor's first front-end piezoresistance is determined based on the atmospheric pressure, the ambient temperature, the predetermined air compressor power, and a first mapping relationship, and the air compressor's first rear-end piezoresistance is determined based on the atmospheric pressure, the ambient temperature, the predetermined fuel cell power, and a second mapping relationship. This replaces the prior art method of using a pressure sensor to detect the front and rear end piezoresistances of the air compressor. Since the first mapping relationship and the second mapping relationship are calibrated, the accuracy of the first rear-end piezoresistance and the first front-end piezoresistance is guaranteed. Therefore, determining the required speed of the air compressor based on the first rear-end piezoresistance, the first front-end piezoresistance, and the required air mass flow rate can accurately meet the air demand of the fuel cell. This eliminates the need for a high-precision pressure sensor on the air compressor to achieve precise control of the oxygen supply, thereby avoiding an imbalance in the oxygen-to-gas ratio of the fuel cell. This reduces the cost of the air compressor and solves the problem of high cost caused by the use of high-precision pressure sensors in the prior art.

[0170] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A flow control method for an air compressor, characterized in that: The air inlet of the air compressor is connected to the air filter, and the air outlet of the air compressor is connected to the fuel cell. The method includes: controlling the air compressor to operate at a predetermined speed, and obtaining a required air mass flow rate, a predetermined fuel cell power, a predetermined air compressor power, atmospheric pressure, and an ambient temperature, wherein the required air mass flow rate is the air mass flow rate required by the fuel cell under the current operating condition, the predetermined fuel cell power is the power of the fuel cell at the predetermined speed, and the predetermined air compressor power is the power of the air compressor at the predetermined speed; determining a first front-end piezoresistor of the air compressor according to the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor, and a first mapping relationship, wherein the first mapping relationship is a mapping relationship obtained by calibration using the atmospheric pressure, the ambient temperature, the power of the air compressor, and the front-end piezoresistor, and the front-end piezoresistor is the piezoresistor of the pipeline at the air inlet of the air compressor; determining a first rear end piezoresistive of the air compressor according to the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell, and a second mapping relationship, wherein the second mapping relationship is a mapping relationship obtained by calibration using the atmospheric pressure, the ambient temperature, the power of the fuel cell, and the rear end piezoresistive, and the rear end piezoresistive is the piezoresistive of the pipeline at the air outlet of the air compressor; The required speed of the air compressor is determined according to the first rear-end piezoresistor, the first front-end piezoresistor, and the required air mass flow rate, and the air compressor is controlled to operate at the required speed.

2. The method according to claim 1, characterized in that Determining the required speed of the air compressor according to the first rear-end piezoresistive force, the first front-end piezoresistive force, and the required air mass flow rate includes: Calculating the sum of the first rear end piezoresistance and the atmospheric pressure to obtain a first rear end pressure of the air compressor; Calculating the difference between the atmospheric pressure and the first front-end piezoresistive pressure to obtain a first front-end pressure of the air compressor; Calculating a ratio of a first rear end pressure of the air compressor to a first front end pressure of the air compressor to obtain a first pressure ratio, wherein the first pressure ratio is a ratio of the rear end pressure of the air compressor to the front end pressure of the air compressor at the predetermined speed; The required speed is determined according to the first pressure ratio, the required air mass flow rate, and a third mapping relationship, where the third mapping relationship is a mapping relationship between the pressure ratio, the air mass flow rate of the air compressor, and the speed of the air compressor.

3. The method according to claim 1, characterized in that After controlling the air compressor to operate at the required speed, the method further includes: Obtaining the power of the air compressor at the required speed to obtain the required power of the air compressor; determining a second pressure ratio according to the required speed, the required power of the air compressor, and a fourth mapping relationship, wherein the second pressure ratio is a ratio of the rear end pressure of the air compressor to the front end pressure of the air compressor at the required speed, and the fourth mapping relationship is a mapping relationship between the pressure ratio, the power of the air compressor, and the speed of the air compressor; determining a current air mass flow rate according to the required speed, the required power of the air compressor, and a fifth mapping relationship, wherein the fifth mapping relationship is a mapping relationship between the air mass flow rate of the air compressor, the power of the air compressor, and the speed of the air compressor; determining a second rear end piezoresistive of the air compressor according to the atmospheric pressure, the ambient temperature, the required power of the fuel cell, and the second mapping relationship, wherein the required power of the fuel cell is the power of the fuel cell at the required speed; Calculating a second front-end piezoresistive force of the air compressor according to the second rear-end piezoresistive force, the atmospheric pressure, and the second pressure ratio; When the second front-end piezoresistive value is less than a piezoresistive threshold value, the required rotational speed is used as the new predetermined rotational speed.

4. The method according to claim 3, characterized in that After calculating the second front-end piezoresistive of the air compressor according to the second rear-end piezoresistive, the atmospheric pressure, and the second pressure ratio, the method further includes: Calculate the product of the second front-end piezoresistance and the air filter ratio to obtain the air filter piezoresistance of the air filter, where the air filter ratio is the ratio of the air filter piezoresistance to the front-end piezoresistance; Calculating a current air volume flow corresponding to the current air mass flow according to the current air mass flow, the atmospheric pressure and the ambient temperature; determining an air filter life state of the air filter according to the current air volume flow rate, the air filter pressure resistance, and a sixth mapping relationship, wherein the air filter life state is a ratio of the remaining service life to the total service life; When the air filter life state is less than a predetermined threshold, a reminder to replace the air filter is issued.

5. The method according to any one of claims 1 to 4, characterized in that Determining a first front-end piezoresistive of the air compressor according to the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor, and a first mapping relationship includes: When the air compressor, and the connected air filter and fuel cell are in a test space, the air pressure and temperature of the test space and the power of the air compressor are adjusted, and the front-end piezoresistive value of the air compressor after adjustment is obtained to obtain a first adjusted air pressure, a first adjusted temperature, an adjusted air compressor power, and an adjusted front-end piezoresistive value, wherein the test space is a space with adjustable air pressure and temperature; generating the first mapping relationship according to a plurality of first adjusted air pressures, the corresponding first adjusted temperatures, the corresponding adjusted air compressor powers, and the corresponding adjusted front-end piezoresistances; The front-end piezoresistor corresponding to the atmospheric pressure, the ambient temperature, and the predetermined power of the air compressor is queried according to the first mapping relationship to obtain the first front-end piezoresistor.

6. The method according to any one of claims 1 to 4, characterized in that Determining a first rear end piezoresistive of the air compressor according to the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell, and a second mapping relationship includes: When the air compressor, and the connected air filter and fuel cell are in a test space, the air pressure and temperature of the test space and the power of the fuel cell are adjusted, and the rear end piezoresistive value of the air compressor after adjustment is obtained to obtain a second adjusted air pressure, a second adjusted temperature, an adjusted fuel cell power, and an adjusted rear end piezoresistive value. The test space is a space with adjustable air pressure and temperature. generating the second mapping relationship according to a plurality of second adjusted gas pressures, corresponding second adjusted temperatures, corresponding adjusted fuel cell powers, and corresponding adjusted rear-end piezoresistances; The rear end piezoresistance corresponding to the atmospheric pressure, the ambient temperature and the predetermined power of the fuel cell is queried according to the second mapping relationship to obtain the first rear end piezoresistance.

7. The method according to any one of claims 1 to 4, characterized in that Determining a first front-end piezoresistive of the air compressor according to the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor, and a first mapping relationship includes: Obtaining the usage time of the air filter; Calculating the difference between the total life of the air filter and the usage time to obtain the remaining service life of the air filter; Calculating a ratio of the remaining service life to the total service life of the air filter to obtain an air filter life status of the air filter, where the air filter life status is the ratio of the remaining service life to the total service life; Calculate the required air volume flow corresponding to the required air mass flow according to the required air mass flow, the atmospheric pressure and the ambient temperature; The first front-end piezoresistive is determined according to a seventh mapping relationship corresponding to the required air volume flow and the air filter life status of the air filter, where the seventh mapping relationship is a mapping relationship between the air volume flow and the front-end piezoresistive.

8. A flow control device for an air compressor, characterized in that: The air inlet of the air compressor is connected to the air filter, and the air outlet of the air compressor is connected to the fuel cell. The device includes: an acquisition unit, configured to control the air compressor to operate at a predetermined speed, and acquire a required air mass flow rate, a predetermined fuel cell power, a predetermined air compressor power, atmospheric pressure, and an ambient temperature, wherein the required air mass flow rate is the air mass flow rate required by the fuel cell under the current operating condition, the predetermined fuel cell power is the power of the fuel cell at the predetermined speed, and the predetermined air compressor power is the power of the air compressor at the predetermined speed; a first determining unit, configured to determine a first front-end piezoresistor of the air compressor based on the atmospheric pressure, the ambient temperature, the predetermined power of the air compressor, and a first mapping relationship, wherein the first mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the air compressor, and the front-end piezoresistor, and the front-end piezoresistor is the piezoresistor of the pipeline at the air inlet of the air compressor; a second determining unit, configured to determine a first rear end piezoresistive of the air compressor according to the atmospheric pressure, the ambient temperature, the predetermined power of the fuel cell, and a second mapping relationship, wherein the second mapping relationship is a mapping relationship calibrated using the atmospheric pressure, the ambient temperature, the power of the fuel cell, and the rear end piezoresistive, and the rear end piezoresistive is the piezoresistive of the pipeline at the air outlet of the air compressor; The third determining unit is configured to determine a required speed of the air compressor according to the first rear-end piezoresistive force, the first front-end piezoresistive force, and the required air mass flow rate, and control the air compressor to operate at the required speed.

9. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

10. A fuel cell system, characterized in that: include: A fuel cell, an air compressor, an air filter, one or more processors, a memory, and one or more programs, wherein the air inlet of the air compressor is connected to the air filter, and the air outlet of the air compressor is connected to the fuel cell, the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 7.

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