Method, device and equipment for determining surge of air compressor

Abstract

The embodiment of the present invention provides an air compressor surge determination method, device and equipment. When the current speed of the target air compressor is within a preset fluctuation range, the current state parameters of the target air compressor are obtained, wherein the current state parameters include the current inlet flow value, the current inlet pressure value and the current outlet pressure value that correspond to each other. When it is detected that the current state parameters meet the preset surge fuzzy determination conditions, the current state parameter change rate of the target air compressor is obtained, and when it is detected that the state parameter change rate meets the preset surge determination conditions, it is further determined that the working state of the target air compressor is surge. Different from the prior art that determines the working state of the air compressor only by the air compressor state parameters, which is prone to misjudgment, the air compressor surge determination method provided by the embodiment of the present invention can also determine the working state of the air compressor based on the air compressor state parameter change rate, effectively improving the accuracy of air compressor surge determination.

Description

Technical Field

[0001] The present invention relates to the technical field of air compressors, and in particular to a method, device and equipment for determining surge of an air compressor. Background Art

[0002] Currently, most air compressors used in fuel cell systems are centrifugal high-speed air compressors. At a certain speed, low flow rate and high pressure ratio, the air compressor will surge. When the air compressor surges, it will cause serious damage to the air compressor and significantly reduce its lifespan. The air compressor is the heart of the fuel cell air system and is very important to the entire fuel cell system. Therefore, the safety and life of the air compressor are particularly important.

[0003] The typical performance of the air compressor during surge is: when the speed is constant, the air compressor outlet pressure shows an abnormal decreasing trend as the flow rate decreases; the flow rate at the air compressor outlet fluctuates in a sawtooth shape, and in severe cases, the flow rate reverses.

[0004] However, current surge curves for fuel cell air compressors are overly simplistic. They simply use a preset surge curve—a curve representing flow rate and pressure ratio—as the compressor's surge curve for the entire lifecycle. However, in actual use, the compressor's surge curve changes with factors such as temperature, inlet pressure, and component aging. If this preset surge curve is used exclusively, effective surge control of the compressor will be inadequate, failing to effectively extend its lifespan. Summary of the Invention

[0005] The embodiments of the present invention solve the technical problem that the prior art cannot accurately determine air compressor surge by providing a method, device and equipment for determining air compressor surge.

[0006] In the first aspect, the present invention provides an air compressor surge determination method through an embodiment of the present invention, comprising: when the current speed of the target air compressor is within a preset fluctuation range, obtaining the current state parameters of the target air compressor, wherein the current state parameters include the current inlet flow value, the current inlet pressure value and the current outlet pressure value that correspond to each other; when it is detected that the current state parameters meet the preset surge fuzzy determination conditions, determining that the working state of the target air compressor is a surge to be determined state, and obtaining the current state parameter change rate of the target air compressor; when it is detected that the state parameter change rate meets the preset surge determination conditions, determining that the working state of the target air compressor is surge.

[0007] Optionally, the detection that the current state parameters meet the preset surge fuzzy judgment conditions includes: when it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is less than the preset first air pressure ratio corresponding to the current inlet flow value, and when it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is greater than the preset second air pressure ratio corresponding to the current inlet flow value, it is determined that the current state parameters meet the surge fuzzy judgment conditions, wherein the first air pressure ratio is greater than the second air pressure ratio.

[0008] Optionally, the current state parameter change rate includes the current inlet flow change rate, the current inlet pressure change rate and the current outlet pressure change rate which correspond to each other. The detection that the state parameter change rate meets the preset surge determination condition includes: detecting that the current inlet flow change rate is greater than the preset flow change rate, detecting that the current inlet pressure change rate is greater than the preset inlet pressure change rate, and detecting that the current outlet pressure change rate is greater than the preset outlet pressure change rate, and determining that the state parameter change rate meets the surge determination condition.

[0009] Optionally, the method also includes: when any one or both of the following situations are detected, determining that the state parameter change rate does not meet the surge determination condition: detecting that the current inlet flow change rate is greater than the preset flow change rate; detecting that the current inlet pressure change rate is greater than the preset inlet pressure change rate; detecting that the current outlet pressure change rate is greater than the preset outlet pressure change rate.

[0010] Optionally, the current state parameter change rate includes the current inlet flow change rate, the current inlet pressure change rate and the current outlet pressure change rate which correspond to each other. The detection that the state parameter change rate meets the preset surge determination condition also includes: when it is detected that the current inlet flow change rate is greater than the preset flow change rate, or when it is detected that the current inlet pressure change rate is greater than the preset inlet pressure change rate, or when it is detected that the current outlet pressure change rate is greater than the preset outlet pressure change rate, it is determined that the state parameter change rate does not meet the surge determination condition.

[0011] Optionally, the target air compressor is connected to a bypass valve. After determining that the working state of the target air compressor is surge, it also includes: controlling the opening of the bypass valve to increase, and adjusting the speed of the target air compressor until the working state of the target air compressor is non-surge.

[0012] Optionally, the method further includes: when it is detected that the current state parameter meets a preset surge determination condition, determining that the operating state of the target air compressor is surge.

[0013] Optionally, the detection that the current state parameter meets the preset surge judgment condition includes: when it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is greater than the preset third air pressure ratio corresponding to the current inlet flow value, it is determined that the current state parameter meets the preset surge judgment condition.

[0014] Optionally, the method further includes: when it is detected that the current state parameter satisfies a preset non-surge determination condition, determining that the operating state of the target air compressor is non-surge.

[0015] Optionally, the detection that the current state parameter meets the preset non-surge judgment condition includes: when it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is less than the preset fourth air pressure ratio corresponding to the current inlet flow value, it is determined that the current state parameter meets the preset non-surge judgment condition.

[0016] Optionally, the target air compressor is connected to a bypass valve, and after determining that the working state of the target air compressor is not surge, the method further includes: controlling the opening of the bypass valve and the speed of the target air compressor to remain unchanged.

[0017] In a second aspect, the present invention provides an air compressor surge determination device according to an embodiment of the present invention, comprising:

[0018] a data acquisition unit, configured to acquire current state parameters of the target air compressor when the current speed of the target air compressor is within a preset fluctuation range, wherein the current state parameters include a current inlet flow value, a current inlet pressure value, and a current outlet pressure value that correspond to each other;

[0019] a first determination unit, configured to determine that the operating state of the target air compressor is a surge pending state when detecting that the current state parameter satisfies a preset surge fuzzy determination condition, and obtain a change rate of the current state parameter of the target air compressor;

[0020] The second determination unit is configured to determine that the operating state of the target air compressor is surge when it is detected that the rate of change of the state parameter satisfies a preset surge determination condition.

[0021] Optionally, the target air compressor is connected to a bypass valve, and the device further includes:

[0022] The control unit is used to control the opening of the bypass valve to increase and adjust the speed of the target air compressor until the operating state of the target air compressor is non-surge.

[0023] In a third aspect, the present invention provides an air compressor surge determination device through an embodiment of the present invention, comprising a memory, a processor, and a code stored in the memory and executable on the processor, wherein when the processor executes the code, any one of the implementations in the first aspect is implemented.

[0024] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0025] By obtaining the current state parameters of the target air compressor when the current speed of the target air compressor is within a preset fluctuation range, wherein the current state parameters include the current inlet flow value, the current inlet pressure value and the current outlet pressure value that correspond to each other, even when it is detected that the current state parameters meet the preset surge fuzzy judgment conditions, it is possible to obtain the current state parameter change rate of the target air compressor, and further determine that the working state of the target air compressor is surge when it is detected that the state parameter change rate meets the preset surge determination conditions. Different from the prior art that determines the working state of the air compressor only by the air compressor state parameters, which is prone to misjudgment, the air compressor surge judgment method provided in the embodiment of the present invention can also determine the working state of the air compressor according to the air compressor state parameter change rate, which at least improves the accuracy of air compressor surge judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic structural diagram of an air supply system in an embodiment of the present invention in one implementation manner;

[0028] Figure 2 Flowchart of a method for determining air compressor surge in an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of the functional relationship between inlet flow rate and air pressure ratio in an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the structure of an air compressor surge determination device according to an embodiment of the present invention;

[0031] Figure 5 Schematic diagram of the structure of an air compressor surge determination device in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The embodiments of the present invention solve the technical problem that the prior art cannot accurately determine air compressor surge by providing a method, device and equipment for determining air compressor surge.

[0033] The technical solution provided by the embodiments of the present invention is to solve the above technical problems, and the overall idea is as follows:

[0034] First, when the current speed of the target air compressor is within a preset fluctuation range, the current state parameters of the target air compressor are obtained, wherein the current state parameters include a current inlet flow value, a current inlet pressure value, and a current outlet pressure value that correspond to each other.

[0035] Even when it is detected that the current state parameters meet the preset surge fuzzy judgment conditions, the operating state of the target air compressor is only determined to be a surge pending state. It is necessary to obtain the current state parameter change rate of the target air compressor and further determine that the operating state of the target air compressor is surge when it is detected that the state parameter change rate meets the preset surge determination conditions.

[0036] Therefore, the embodiment of the present invention is different from the prior art in which the working state of the air compressor is determined only by the air compressor status parameters. The determination conditions of the prior art are easily affected by factors such as temperature, inlet pressure and component aging, which may lead to misjudgment. The air compressor surge determination method provided by the embodiment of the present invention can further determine the working state of the air compressor based on the rate of change of the air compressor status parameters, thereby effectively improving the accuracy of air compressor surge determination.

[0037] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0038] First, the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0039] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0040] In the first aspect, the present invention provides an air compressor surge determination method through an embodiment of the present invention, which can be applied to an air compressor in an air supply system. Specifically, the air supply system can be an air supply system of a fuel cell. In some optional embodiments, see Figure 1 As shown, the air supply system may include an air filter 101 , an air compressor 102 , an intercooler 103 , a throttle valve 104 , an inlet flow sensor 105 , an inlet pressure sensor 106 , an outlet pressure sensor 107 and connecting pipes (not shown).

[0041] Among them, the air filter 101 is connected to the air inlet of the air compressor 102, and the intercooler 103 is connected to the air outlet of the air compressor 102; the inlet flow sensor 105 and the inlet pressure sensor 106 are arranged between the air filter 101 and the air compressor 102, and the outlet pressure sensor 107 is arranged between the intercooler 103 and the air compressor 102.

[0042] Among them, the intercooler 103 is connected to the throttle valve 104, and the throttle valve 104 is provided with an interface connected to the inlet and outlet of the fuel cell stack (not shown). When the throttle valve 104 is connected to the inlet and outlet of the fuel cell stack, the reaction rate of the fuel cell stack can be controlled by controlling the opening of the throttle valve 104.

[0043] After being filtered by the air filter 101, the air enters the air compressor 102. After being pressurized by the air compressor 102, the temperature of the air rises. The compressed air flows through the intercooler 103 to cool down. The cooled compressed air flows into the fuel cell stack through the throttle 104. After the fuel cell stack consumes the compressed air for chemical reaction, the exhaust gas after the reaction is discharged through the throttle 104.

[0044] When the air compressor 102 provides compressed air to the fuel cell stack, if the fuel cell stack requires less gas, the outlet flow of the air compressor 102 will decrease, the outlet pressure will increase, and the air compressor will surge.

[0045] The air compressor surge determination method provided in the embodiment of the present invention can more accurately determine whether the working state of the air compressor is surge, and then when it is determined that the working state of the air compressor is surge, the bypass valve 108 can be opened in time to increase the outlet flow of the air compressor 102, thereby preventing the air compressor 102 from surging. In addition, the bypass valve 108 can discharge excess compressed air into the atmosphere, thereby preventing the air compressor 102 from being subjected to excessive air pressure and ensuring the safety of the air compressor 102.

[0046] See Figure 2 As shown, the air compressor surge determination method may include the following steps S201 to S203:

[0047] Step S201: When the current rotation speed of the target air compressor is within a preset fluctuation range, the current state parameters of the target air compressor are obtained.

[0048] The current state parameters include a current inlet flow rate value, a current inlet pressure value, and a current outlet pressure value that correspond to each other.

[0049] Specifically, after the target air compressor starts running, in order to determine whether the target air compressor has entered a relatively stable operating state and to facilitate a preliminary judgment on the working state of the target air compressor, the judgment can be made based on the change in the speed of the target air compressor within a certain period of time.

[0050] Specifically, the target air compressor can be determined to be in a stable operating state when the current speed of the target air compressor is detected to be within a preset fluctuation range. In a specific implementation, the preset fluctuation range can be set according to the actual application scenario. The smaller the preset fluctuation range, the more difficult it is to determine that the target air compressor is in a stable operating state, and the more difficult it is to trigger the step of obtaining the current state parameters of the target air compressor.

[0051] Step S202: When it is detected that the current state parameter meets the preset surge fuzzy determination condition, the operating state of the target air compressor is determined to be a surge pending state, and the change rate of the current state parameter of the target air compressor is obtained.

[0052] Regarding how to detect whether the current state parameters satisfy the preset surge fuzzy determination conditions, specifically, when it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is less than a preset first air pressure ratio corresponding to the current inlet flow rate value, and when it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is greater than a preset second air pressure ratio corresponding to the current inlet flow rate value, it is determined that the current state parameters satisfy the surge fuzzy determination conditions. The first air pressure ratio is greater than the second air pressure ratio.

[0053] In a specific implementation process, in order to determine the first air pressure ratio that corresponds one-to-one to the current inlet flow value, a relationship between the current inlet flow value and the first air pressure ratio may be established in advance.

[0054] In some optional embodiments, the relationship between the current inlet flow value and the first air pressure ratio can be represented by a functional equation. Specifically, the target air compressor can be tested multiple times to obtain different inlet flow values and their corresponding first air pressure ratios, and the functional equation of the current inlet flow value and the first air pressure ratio can be established by fitting and processing these data.

[0055] For example, the relationship between the current inlet flow rate and the first air pressure ratio can be represented by the following function equation (1):

[0056] Pr1=f1(m) (1)

[0057] In the functional equation (1), Pr1 is the first air pressure ratio of the target air compressor, m is the current inlet flow value of the target air compressor, and f1 is the functional equation between the first air pressure ratio and the current inlet flow value.

[0058] In this way, based on the current inlet flow rate value of the target air compressor and the above-mentioned functional equation (1), the first air pressure ratio corresponding to the inlet flow rate value can be obtained.

[0059] Similarly, in order to determine the second air pressure ratio that corresponds one-to-one to the current inlet flow rate value, a relationship between the current inlet flow rate value and the second air pressure ratio may be established in advance.

[0060] In some optional embodiments, the relationship between the current inlet flow value and the second air pressure ratio can also be represented by a functional equation. Specifically, different inlet flow values and their corresponding second air pressure ratios can be obtained based on the durability test and three-high environment test of the target air compressor, and the functional equation of the current inlet flow value and the second air pressure ratio can be established by fitting and processing these data.

[0061] Among them, the durability test and the three-high environment test can be set according to the component aging, fuel cell system aging, ambient temperature changes, and ambient pressure changes that the target air compressor may experience throughout its life cycle.

[0062] For example, the relationship between the current inlet flow rate and the second air pressure ratio can be represented by the following function equation (2):

[0063] Pr2=f2(m) (2)

[0064] In the functional equation (2), Pr2 is the second air pressure ratio of the target air compressor, m is the current inlet flow value of the target air compressor, and f2 is the functional equation between the second air pressure ratio and the current inlet flow value.

[0065] As an optional implementation, the relationship between the current inlet flow rate value and the second air pressure ratio may also be determined based on the relationship between the current inlet flow rate value and the first air pressure ratio.

[0066] Specifically, a proportional factor for the current inlet flow rate can be set. This proportional factor can be set according to the actual application scenario. In an optional embodiment, the proportional factor can be set to any value between 1.3 and 1.4. Correspondingly, the relationship between the current inlet flow rate value and the second air pressure ratio can be determined based on the proportional factor and the above-mentioned functional equation (1).

[0067] For example, the relationship between the current inlet flow rate and the second air pressure ratio can also be represented by the following function equation (3):

[0068] Pr2=f1(km) (3)

[0069] In the function equation (3), Pr2 is the second air pressure ratio of the target air compressor, m is the current inlet flow value of the target air compressor, f1 is the function equation between the first air pressure ratio and the current inlet flow value, and k is the proportional factor of the current inlet flow.

[0070] In this way, based on the current inlet flow rate value of the target air compressor and the above-mentioned functional equation (2) or the above-mentioned functional equation (3), the second air pressure ratio corresponding to the inlet flow rate value can be obtained.

[0071] When the current inlet flow rate values are the same, if the ratio of the current outlet pressure value to the current inlet pressure value is less than the first air pressure ratio and greater than the second air pressure ratio, it is determined that the current state parameter meets the surge fuzzy determination condition.

[0072] In order to more intuitively judge whether the current state parameters meet the preset surge fuzzy judgment conditions, please refer to Figure 3 As shown, the relationship between the current inlet flow value and the first air pressure ratio is function equation (1), and the relationship between the current inlet flow value and the second air pressure ratio is function equation (2).

[0073] If the current state parameter is in the region between function equation (1) and function equation (2), it indicates that under the same current inlet flow rate, the ratio of the current outlet pressure value to the current inlet pressure value is less than the first air pressure ratio and greater than the second air pressure ratio. In other words, when the current state parameter is in the region between function equation (1) and function equation (2), it indicates that the current state parameter meets the surge fuzzy judgment condition.

[0074] When the current state parameters meet the preset surge fuzzy judgment conditions, the working state of the target air compressor may be surge or not. In order to more accurately determine the working state of the target air compressor, the working state of the target air compressor can be first determined to be a surge to be determined state, and the change rate of the current state parameters of the target air compressor can be obtained.

[0075] Specifically, the current state parameter change rate may include a current inlet flow rate change rate, a current inlet pressure change rate, and a current outlet pressure change rate that correspond to each other.

[0076] Step S203: When it is detected that the rate of change of the state parameter satisfies a preset surge determination condition, it is determined that the operating state of the target air compressor is surge.

[0077] Regarding how to detect whether the state parameter change rate meets the preset surge determination condition, specifically, when it is detected that the current inlet flow change rate is greater than the preset flow change rate, and the current inlet pressure change rate is greater than the preset inlet pressure change rate, and the current outlet pressure change rate is greater than the preset outlet pressure change rate, it can be determined that the state parameter change rate meets the surge determination condition.

[0078] The preset flow rate change rate, the preset inlet pressure change rate, and the preset outlet pressure change rate can all be set based on actual application scenarios. The smaller the preset flow rate change rate, the smaller the preset inlet pressure change rate, or the smaller the preset outlet pressure change rate, the more difficult it is to determine that the state parameter change rate meets the preset surge determination condition, and the more difficult it is to trigger the step of determining that the operating state of the target air compressor is surge.

[0079] In contrast to the above-mentioned embodiment, when any one or both of the following situations are detected, it is determined that the state parameter change rate does not meet the surge determination condition: it is detected that the current inlet flow change rate is greater than the preset flow change rate; it is detected that the current inlet pressure change rate is greater than the preset inlet pressure change rate; it is detected that the current outlet pressure change rate is greater than the preset outlet pressure change rate.

[0080] In order to avoid the above-mentioned embodiment from making it difficult to determine that the operating state of the target air compressor is surge, resulting in a lack of effective protection for the target air compressor, different from the above-mentioned embodiment, it is also possible to determine that the state parameter change rate does not meet the surge determination condition when it is detected that the current inlet flow change rate is greater than the preset flow change rate, or when it is detected that the current inlet pressure change rate is greater than the preset inlet pressure change rate, or when it is detected that the current outlet pressure change rate is greater than the preset outlet pressure change rate.

[0081] Compared with the above embodiment, the present embodiment is more stringent in determining whether the rate of change of the state parameter satisfies the preset surge determination condition, and is more likely to determine that the operating state of the target air compressor is surge, so more air needs to be bypassed through the bypass valve. Although this leads to waste of compressed air, the protection of the target air compressor is more thorough, and the service life of the target air compressor can be increased.

[0082] After determining that the operating state of the target air compressor is surge, the opening of the bypass valve may be controlled to increase, and the rotation speed of the target air compressor may be adjusted until the operating state of the target air compressor is non-surge.

[0083] As an optional implementation manner, when it is detected that the current state parameter meets the preset surge determination condition, it is determined that the operating state of the target air compressor is surge.

[0084] Regarding how to detect whether the current state parameters meet the preset surge judgment conditions, specifically, when it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is greater than the preset third air pressure ratio corresponding to the current inlet flow value, it can be determined that the current state parameters meet the preset surge judgment conditions.

[0085] In a specific implementation process, in order to determine the third air pressure ratio that corresponds one-to-one to the current inlet flow value, a relationship between the current inlet flow value and the third air pressure ratio may be established in advance.

[0086] In some optional embodiments, the relationship between the current inlet flow rate value and the third air pressure ratio can be determined based on the relationship between the current inlet flow rate value and the first air pressure ratio. For example, the relationship between the current inlet flow rate value and the third air pressure ratio can be represented by the above functional equation (1).

[0087] In order to more intuitively judge whether the current state parameters meet the preset surge judgment conditions, please refer to Figure 3 As shown in Figure 1, if the current state parameter is in the upper region of function equation (1), it indicates that under the same current inlet flow rate, the ratio of the current outlet pressure value to the current inlet pressure value is greater than the third air pressure ratio. In other words, when the current state parameter is in the upper region of function equation (1), it indicates that the current state parameter meets the preset surge judgment condition.

[0088] As an optional implementation manner, when it is detected that the current state parameter meets the preset non-surge determination condition, it is determined that the operating state of the target air compressor is non-surge.

[0089] Regarding how to detect whether the current state parameters meet the preset non-surge judgment conditions, specifically, when it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is less than the preset fourth air pressure ratio corresponding to the current inlet flow value, it can be determined that the current state parameters meet the preset non-surge judgment conditions.

[0090] In a specific implementation process, in order to determine the fourth air pressure ratio that corresponds one-to-one to the current inlet flow rate value, a relationship between the current inlet flow rate value and the fourth air pressure ratio may be established in advance.

[0091] In some optional embodiments, the relationship between the current inlet flow rate value and the fourth air pressure ratio can be determined based on the relationship between the current inlet flow rate value and the second air pressure ratio. For example, the relationship between the current inlet flow rate value and the fourth air pressure ratio can be represented by the above-mentioned function equation (2) or function equation (3).

[0092] In order to more intuitively judge whether the current state parameters meet the preset non-surge judgment conditions, please refer to Figure 3As shown, if the current state parameter is in the area below function equation (2), it indicates that under the same current inlet flow rate, the ratio of the current outlet pressure value to the current inlet pressure value is less than the fourth air pressure ratio. In other words, when the current state parameter is in the area below function equation (2), it indicates that the current state parameter meets the preset non-surge judgment condition.

[0093] Correspondingly, after determining that the operating state of the target air compressor is not surging, the opening of the bypass valve and the speed of the target air compressor may be controlled to remain unchanged.

[0094] In the second aspect, based on the same inventive concept, the present invention provides an air compressor surge determination device through an embodiment of the present invention, which can be applied to an air compressor in an air supply system. Figure 4 As shown, the air compressor surge determination device includes:

[0095] The data acquisition unit 401 is used to acquire current state parameters of the target air compressor when the current speed of the target air compressor is within a preset fluctuation range, wherein the current state parameters include a current inlet flow value, a current inlet pressure value, and a current outlet pressure value that correspond to each other.

[0096] The first determination unit 402 is configured to determine that the operating state of the target air compressor is a surge pending state when detecting that the current state parameter satisfies a preset surge fuzzy determination condition, and obtain a change rate of the current state parameter of the target air compressor.

[0097] The second determination unit 403 is configured to determine that the operating state of the target air compressor is surge when it is detected that the rate of change of the state parameter satisfies a preset surge determination condition.

[0098] As an optional implementation manner, the first determining unit 402 is specifically configured to:

[0099] When it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is less than the preset first air pressure ratio corresponding to the current inlet flow value, and when it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is greater than the preset second air pressure ratio corresponding to the current inlet flow value, it is determined that the current state parameters meet the surge fuzzy determination conditions, wherein the first air pressure ratio is greater than the second air pressure ratio.

[0100] As an optional implementation manner, the current state parameter change rate includes the corresponding current inlet flow rate change rate, the current inlet pressure change rate, and the current outlet pressure change rate. The second determination unit 403 is specifically configured to:

[0101] When it is detected that the current inlet flow change rate is greater than the preset flow change rate, the current inlet pressure change rate is greater than the preset inlet pressure change rate, and the current outlet pressure change rate is greater than the preset outlet pressure change rate, it is determined that the state parameter change rate meets the surge determination condition.

[0102] As an optional implementation manner, the second determining unit 403 is further configured to:

[0103] When any one or both of the following situations are detected, it is determined that the state parameter change rate does not meet the surge determination condition: it is detected that the current inlet flow change rate is greater than the preset flow change rate; it is detected that the current inlet pressure change rate is greater than the preset inlet pressure change rate; it is detected that the current outlet pressure change rate is greater than the preset outlet pressure change rate.

[0104] Different from the above embodiment, the second determining unit 403 is further configured to:

[0105] When it is detected that the current inlet flow change rate is greater than the preset flow change rate, or when it is detected that the current inlet pressure change rate is greater than the preset inlet pressure change rate, or when it is detected that the current outlet pressure change rate is greater than the preset outlet pressure change rate, it is determined that the state parameter change rate does not meet the surge determination condition.

[0106] As an optional embodiment, the target air compressor is connected to a bypass valve, and the air compressor surge determination device further includes:

[0107] The control unit 404 is configured to, after determining that the operating state of the target air compressor is surge, control the bypass valve to increase its opening and adjust the speed of the target air compressor until the operating state of the target air compressor is non-surge.

[0108] As an optional implementation manner, the first determining unit 402 is further configured to:

[0109] When it is detected that the current state parameter meets the preset surge determination condition, it is determined that the operating state of the target air compressor is surge.

[0110] As an optional implementation manner, the first determining unit 402 is further configured to:

[0111] When it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is greater than a preset third air pressure ratio corresponding to the current inlet flow value, it is determined that the current state parameter meets the preset surge determination condition.

[0112] Different from the above embodiment, the first determining unit 402 is further configured to:

[0113] When it is detected that the current state parameter meets the preset non-surge determination condition, it is determined that the operating state of the target air compressor is non-surge.

[0114] Correspondingly, the first determining unit 402 is further specifically configured to:

[0115] When it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is less than a preset fourth air pressure ratio corresponding to the current inlet flow value, it is determined that the current state parameter meets the preset non-surge determination condition.

[0116] As an optional implementation manner, after determining that the operating state of the target air compressor is not surge, the control unit 404 is further configured to:

[0117] The opening of the bypass valve and the speed of the target air compressor remain unchanged.

[0118] Since the air compressor surge determination device described in this embodiment is an electronic device used to implement the air compressor surge determination method described in the embodiment of the present invention, those skilled in the art will be able to understand the specific implementation and various variations of the electronic device of this embodiment based on the air compressor surge determination method described in the embodiment of the present invention. Therefore, how the electronic device implements the method described in the embodiment of the present invention will not be described in detail here. As long as those skilled in the art can implement the electronic device used in the air compressor surge determination method described in the embodiment of the present invention, it falls within the scope of protection of the present invention.

[0119] In a third aspect, based on the same inventive concept, an embodiment of the present invention provides an air compressor surge determination device, which can be applied to an air compressor in an air supply system.

[0120] refer to Figure 5 As shown, the air compressor surge determination device provided by the embodiment of the present invention includes: a memory 501, a processor 502 and a code stored in the memory and executable on the processor 502. When executing the code, the processor 502 implements any implementation of the air compressor surge determination method described above.

[0121] Among them, Figure 5In the embodiment of the present invention, a bus architecture (represented by bus 500) is shown. Bus 500 may include any number of interconnected buses and bridges, and bus 500 links various circuits including one or more processors represented by processor 502 and memory represented by memory 501. Bus 500 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 505 provides an interface between bus 500 and receiver 503 and transmitter 504. Receiver 503 and transmitter 504 may be the same component, namely a transceiver, which provides a unit for communicating with various other devices over a transmission medium. Processor 502 is responsible for managing bus 500 and general processing, while memory 501 may be used to store data used by processor 502 when performing operations.

[0122] The technical solutions in the above embodiments of the present invention have at least the following technical effects or advantages:

[0123] When the current speed of the target air compressor is within a preset fluctuation range, the current state parameters of the target air compressor are obtained, wherein the current state parameters include the current inlet flow value, the current inlet pressure value, and the current outlet pressure value that correspond to each other. Even when it is detected that the current state parameters meet the preset surge fuzzy judgment conditions, it is possible to obtain the current state parameter change rate of the target air compressor, and when it is detected that the state parameter change rate meets the preset surge determination conditions, further determine that the working state of the target air compressor is surge. Different from the prior art that determines the working state of the air compressor only by the air compressor state parameters, which is prone to misjudgment, the air compressor surge determination method provided in the embodiment of the present invention can also determine the working state of the air compressor based on the air compressor state parameter change rate, effectively improving the accuracy of air compressor surge determination.

[0124] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable code.

[0125] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as combinations of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer instructions. These computer 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 process in the flowchart and / or block diagram. 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.

[0126] These computer instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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.

[0127] These computer 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.

[0128] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0129] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for determining air compressor surge, characterized in that: include: When the current speed of the target air compressor is within a preset fluctuation range, obtaining current state parameters of the target air compressor, wherein the current state parameters include a current inlet flow value, a current inlet pressure value, and a current outlet pressure value that correspond to each other; When it is detected that the current state parameter satisfies a preset surge fuzzy determination condition, determining that the operating state of the target air compressor is a surge to-be-determined state, and obtaining a change rate of the current state parameter of the target air compressor; When it is detected that the rate of change of the state parameter satisfies a preset surge determination condition, it is determined that the operating state of the target air compressor is surge.

2. The method according to claim 1, wherein The detecting that the current state parameter satisfies a preset surge fuzzy determination condition includes: When it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is less than a first air pressure ratio preset corresponding to the current inlet flow value, and when it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is greater than a second air pressure ratio preset corresponding to the current inlet flow value, it is determined that the current state parameters meet the surge fuzzy determination condition, wherein the first air pressure ratio is greater than the second air pressure ratio.

3. The method according to claim 1, wherein The current state parameter change rate includes a current inlet flow rate change rate, a current inlet pressure change rate, and a current outlet pressure change rate that correspond to each other. Detecting that the state parameter change rate meets a preset surge determination condition includes: When it is detected that the current inlet flow rate change rate is greater than the preset flow rate change rate, and the current inlet pressure change rate is greater than the preset inlet pressure change rate, and the current outlet pressure change rate is greater than the preset outlet pressure change rate, it is determined that the state parameter change rate meets the surge determination condition.

4. The method according to claim 3, wherein Also includes: When any one or both of the following situations are detected, it is determined that the state parameter change rate does not meet the surge determination condition: detecting that the current inlet flow rate change rate is greater than the preset flow rate change rate; detecting that the current inlet pressure change rate is greater than the preset inlet pressure change rate; It is detected that the current outlet pressure change rate is greater than the preset outlet pressure change rate.

5. The method according to claim 1, wherein The current state parameter change rate includes a current inlet flow rate change rate, a current inlet pressure change rate, and a current outlet pressure change rate that correspond to each other. The detecting that the state parameter change rate meets a preset surge determination condition further includes: When it is detected that the current inlet flow change rate is greater than the preset flow change rate, or when it is detected that the current inlet pressure change rate is greater than the preset inlet pressure change rate, or when it is detected that the current outlet pressure change rate is greater than the preset outlet pressure change rate, it is determined that the state parameter change rate does not meet the surge determination condition.

6. The method according to claim 1, wherein The target air compressor is connected to a bypass valve, and after determining that the operating state of the target air compressor is surge, the method further includes: The opening of the bypass valve is controlled to increase, and the rotational speed of the target air compressor is adjusted until the operating state of the target air compressor is non-surge.

7. The method according to claim 1, wherein Also includes: When it is detected that the current state parameter meets a preset surge determination condition, it is determined that the operating state of the target air compressor is surge.

8. The method according to claim 7, wherein The detecting that the current state parameter satisfies a preset surge determination condition includes: When it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is greater than a preset third air pressure ratio corresponding to the current inlet flow value, it is determined that the current state parameter meets a preset surge determination condition.

9. The method according to claim 1, wherein Also includes: When it is detected that the current state parameter satisfies a preset non-surge determination condition, it is determined that the operating state of the target air compressor is non-surge.

10. The method according to claim 9, wherein The detecting that the current state parameter satisfies a preset non-surge determination condition includes: When it is detected that the ratio of the current outlet pressure value to the current inlet pressure value is less than a preset fourth air pressure ratio corresponding to the current inlet flow value, it is determined that the current state parameter meets a preset non-surge determination condition.

11. The method according to claim 7, wherein The target air compressor is connected to a bypass valve. After determining that the operating state of the target air compressor is not surge, the method further includes: The opening of the bypass valve and the speed of the target air compressor are controlled to remain unchanged.

12. An air compressor surge determination device, characterized in that: include: a data acquisition unit, configured to acquire current state parameters of the target air compressor when the current speed of the target air compressor is within a preset fluctuation range, wherein the current state parameters include a current inlet flow value, a current inlet pressure value, and a current outlet pressure value that correspond to each other; a first determination unit, configured to determine that the operating state of the target air compressor is a surge pending state when detecting that the current state parameter satisfies a preset surge fuzzy determination condition, and obtain a change rate of the current state parameter of the target air compressor; The second determination unit is configured to determine that the operating state of the target air compressor is surge when it is detected that the rate of change of the state parameter satisfies a preset surge determination condition.

13. The device according to claim 12, wherein The target air compressor is connected to a bypass valve, and the device further comprises: The control unit is used to control the opening of the bypass valve to increase and adjust the speed of the target air compressor until the operating state of the target air compressor is non-surge.

14. An air compressor surge determination device, comprising a memory, a processor, and a code stored in the memory and executable on the processor, characterized in that: When the processor executes the code, the method according to any one of claims 1 to 11 is implemented.

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