Air compressor control method, system, device and storage medium

Abstract

The present invention discloses a control method, system, device and storage medium for an air compressor. The control method comprises the following steps: obtaining the surge interval of the air compressor; when the working state of the air compressor is in the surge interval, controlling the opening and closing degree of the throttle valve to make the air compressor out of the surge interval; when the working state of the air compressor is not in the surge interval, controlling the opening and closing degree of the throttle valve according to the working state of the air compressor and the target efficiency interval to make the air compressor operate in the target efficiency interval. Through this method, the air compressor can be made to leave the surge interval when the air compressor surges, and when the air compressor is about to surge, it can be kept away from the surge interval and the air compressor can be operated in the target efficiency interval.

Description

Technical Field

[0001] The present invention relates to the field of automatic control, and in particular to a control method, system, equipment and storage medium for an air compressor. Background Art

[0002] Surge refers to a vibration under abnormal working conditions that occurs when the air compressor flow rate decreases to a certain extent at a certain speed. When surge occurs, the outlet pressure of the air compressor increases first, then drops sharply, and shows periodic and large fluctuations; the air compressor flow rate will also drop sharply and fluctuate greatly, and in severe cases, air will even flow back into the intake pipe; at the same time, the current and power of the air compressor will also be unstable, the machine will produce strong vibrations, and accompanied by abnormal airflow noise, thereby accelerating the damage of the bearings, seals and impellers in the air compressor, affecting the normal operation of the fuel cell system.

[0003] The reason why air compressor surge occurs in existing fuel cell air systems is mostly because the pressure control and flow control of the control system are independent of each other, and the coupling relationship between pressure and flow is not taken into account, or the coupling relationship is taken into account but the control algorithm is not good enough to handle the impact of pressure and flow, causing the air compressor to deviate from the optimal efficiency curve, which not only increases the energy consumption of the system, but also causes surge during operation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects in the prior art that it is difficult for the air compressor to leave the surge range and easily deviate from the target efficiency range, and to provide a control method, system, equipment and storage medium for an air compressor.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The control method comprises the following steps:

[0007] Get the surge range of the air compressor;

[0008] When the working state of the air compressor is in the surge range, the opening and closing degree of the throttle valve is controlled to make the air compressor out of the surge range;

[0009] When the working state of the air compressor is not in the surge range, the opening and closing degree of the throttle valve is controlled according to the working state of the air compressor and the target efficiency range, so that the air compressor operates in the target efficiency range.

[0010] Preferably, the control method further comprises:

[0011] When the air compressor is in the surge range, after the first time period after the throttle valve opening and closing parameters are controlled, if the air compressor is still in the surge range, the throttle valve opening and closing degree is increased.

[0012] Preferably, after the second time period in which the opening and closing degree of the throttle valve is increased, if the air compressor is still in the surge range, the rotation speed of the air compressor is reduced.

[0013] Preferably, after the step of obtaining the surge range of the air compressor, the control method further comprises:

[0014] Obtaining a current flow rate at a current speed of the air compressor and a surge flow rate at the current speed, and / or obtaining a current pressure ratio at a current speed of the air compressor and a surge pressure ratio at the current speed;

[0015] It is determined whether the air compressor is in a surge range according to the current flow rate and the surge flow rate, and / or according to the current pressure ratio and the surge pressure ratio.

[0016] Preferably, the step of controlling the opening and closing degree of the throttle valve according to the working state of the air compressor and the target efficiency range specifically includes:

[0017] Obtaining a current flow rate at a current speed of the air compressor and a target working flow rate in a target efficiency range at the current speed, and / or obtaining a current pressure ratio at a current speed of the air compressor and a target pressure ratio in a target efficiency range at the current speed;

[0018] The opening and closing degree of the throttle valve is controlled according to the current flow rate and the target operating flow rate in the target efficiency range at the current speed, and / or according to the current pressure ratio and the target pressure ratio.

[0019] As a second aspect of the present invention, the present invention provides a control system for an air compressor, the control system comprising an acquisition module, a surge release module and a target efficiency control module;

[0020] The acquisition module is used to obtain the surge range of the air compressor;

[0021] The surge release module is used to control the opening and closing degree of the throttle valve when the working state of the air compressor is in the surge range, so as to make the air compressor out of the surge range;

[0022] The target efficiency control module is used to control the opening and closing degree of the throttle valve according to the working state of the air compressor and the target efficiency range when the working state of the air compressor is not in the surge range, so as to make the air compressor operate in the target efficiency range.

[0023] Preferably, the surge release module is used to increase the opening and closing degree of the throttle valve if the air compressor is still in the surge range after a first time period after controlling the throttle valve opening and closing parameters when the air compressor is in the surge range.

[0024] Preferably, the surge release module is used to reduce the rotation speed of the air compressor if the air compressor is still in the surge range after the second time period of increasing the opening and closing degree of the throttle valve.

[0025] Preferably, the acquisition module is further used to acquire the current flow rate of the air compressor at the current speed and the surge flow rate at the current speed, and / or to acquire the current pressure ratio of the air compressor at the current speed and the surge pressure ratio at the current speed;

[0026] And determine whether the air compressor is in the surge range according to the current flow rate and the surge flow rate, and / or according to the current pressure ratio and the surge pressure ratio.

[0027] Preferably, controlling the opening and closing degree of the throttle according to the working state of the air compressor and the target efficiency range specifically includes:

[0028] Obtaining a current flow rate at a current speed of the air compressor and a target working flow rate in a target efficiency range at the current speed, and / or obtaining a current pressure ratio at a current speed of the air compressor and a target pressure ratio in a target efficiency range at the current speed;

[0029] The opening and closing degree of the throttle valve is controlled according to the current flow rate and the target operating flow rate in the target efficiency range at the current speed, and / or according to the current pressure ratio and the target pressure ratio.

[0030] As a third aspect of the present invention, the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the air compressor control method of the first aspect of the present invention when executing the computer program.

[0031] As a fourth aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the air compressor control method of the first aspect of the present invention.

[0032] The positive and progressive effect of the present invention is that when the air compressor is in the surge range, the opening and closing degree of the throttle valve is controlled to make the air compressor leave the surge range; when the air compressor is in the surge range, the opening and closing degree of the throttle valve is controlled to make the air compressor operate in the target efficiency range. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the flow of the air compressor control method in Example 1 of the present invention.

[0034] Figure 2 Schematic diagram of air compressor flow-pressure ratio in Example 1 of the present invention.

[0035] Figure 3 A schematic diagram of the structure of the control system of the air compressor in Example 2 of the present invention.

[0036] Figure 4 This is a schematic diagram of the structure of an electronic device according to Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0037] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0038] Example 1

[0039] This embodiment provides a control method for an air compressor. Figure 1 as well as Figure 2 , the control method of the air compressor includes the following steps:

[0040] S1. Obtain the surge range of the air compressor;

[0041] S2. When the working state of the air compressor is in the surge range, control the opening and closing degree of the throttle valve to make the air compressor out of the surge range;

[0042] S3. When the working state of the air compressor is not in the surge range, the opening and closing degree of the throttle valve is controlled according to the working state of the air compressor and the target efficiency range, so that the air compressor operates in the target efficiency range.

[0043] In this embodiment, the air compressor can be in the surge range (see Figure 2 The area to the left of the middle surge line is the surge range), by controlling the opening and closing degree of the throttle valve, the air compressor is allowed to leave the surge range. When the air compressor is in the surge range, the opening and closing degree of the throttle valve is controlled to make the air compressor operate in the target efficiency range.

[0044] In this embodiment, the working state of the air compressor can be determined by the pressure ratio and flow rate of the air compressor. Figure 2 This is a schematic diagram of the flow rate and pressure ratio of different air compressors at different speeds. At a certain speed, the flow rate and pressure ratio of the air compressor meet Figure 2 The air compressor working curve in Figure 2 The first speed compressor working curve, the second speed compressor working curve and the third speed compressor working curve in the figure are shown in the figure. When the compressor working curve meets the pressure ratio and flow conditions, the compressor surges. At this point, it can be determined that the compressor is in a surge state. The target efficiency range (e.g. Figure 2 The first target working efficiency range and the second target working efficiency range in the working curve of the air compressor at a certain speed refer to the target efficiency range of the air compressor determined when the air compressor meets a certain target flow range (or a certain target pressure ratio range).

[0045] In the above embodiment, in step S3, when the working state of the air compressor is not in the surge range, it can specifically include when the working state of the air compressor is in the critical surge range of the air compressor (for example, the difference between the flow rate of the air compressor and the surge flow rate where surge occurs is less than the preset flow difference; or the difference between the pressure ratio of the air compressor and the surge pressure ratio where surge occurs is less than the preset pressure ratio difference), controlling the opening and closing degree of the throttle valve to make the air compressor operate in the target efficiency range.

[0046] In the above embodiment, controlling the opening and closing degree of the throttle should not be limited to being understood as the throttle being controlled continuously, but also includes controlling the opening and closing degree of the throttle at a certain time interval. For example, if the throttle is opened 10% per second, the opening and closing degree at the 0th second is 10%, and the opening and closing degree at the 1st second is 20%. The opening and closing degree in the above embodiment can be continuously changing from the 0th second to the 1st second, or a signal can be given to the throttle at the 1st second, so that the opening and closing degree of the throttle is directly 20% at the 1st second.

[0047] In this embodiment, the opening and closing degree of the throttle valve may also be increased in a fixed step length, and adjusted in a fixed step length until the surging range is exited.

[0048] In an optional embodiment, the control method further includes:

[0049] When the air compressor is in the surge range, after the first time period after the throttle valve opening and closing parameters are controlled, if the air compressor is still in the surge range, the throttle valve opening and closing degree is increased.

[0050] In this embodiment, it is possible to prevent the air compressor from being difficult to leave the surge interval, and to accelerate the probability of the air compressor leaving the surge interval. It should be noted that, in this embodiment, the first time period may also include a plurality of first sub-time periods, and a certain first sub-time period is satisfied to increase the opening sub-speed in the throttle opening and closing degree.

[0051] In an optional embodiment, after the second time period in which the opening and closing degree of the throttle valve is increased, if the air compressor is still in the surge range, the rotation speed of the air compressor is reduced.

[0052] In this embodiment, the speed of the air compressor is reduced to reduce the flow rate of the air compressor to reach surge at the same pressure ratio. In this embodiment, the opening and closing of the throttle valve has a very rapid effect on the air compressor, but changing the speed of the air compressor is relatively slow, so the throttle valve is changed first, and then the speed of the air compressor is changed. To achieve the goal of getting the air compressor out of the surge range.

[0053] In an optional embodiment, after the step of obtaining the surge interval of the air compressor, the control method further includes:

[0054] Obtaining a current flow rate at a current speed of the air compressor and a surge flow rate at the current speed, and / or obtaining a current pressure ratio at a current speed of the air compressor and a surge pressure ratio at the current speed;

[0055] It is determined whether the air compressor is in a surge range according to the current flow rate and the surge flow rate, and / or according to the current pressure ratio and the surge pressure ratio.

[0056] In this embodiment, if the current flow rate is less than the surge flow rate or the current pressure ratio is less than the surge pressure ratio, it can be determined that the air compressor is in the surge range.

[0057] In this embodiment, it is also possible to determine whether the air compressor is in a surge state and how close the air compressor is to the occurrence of surge by using the pressure surge coefficient and the flow surge coefficient.

[0058] Wherein, pressure surge coefficient = (pressure ratio during surge - actual pressure) / (pressure ratio during surge - pressure ratio during peak efficiency);

[0059] Flow surge coefficient = (actual flow - flow during surge) / (flow at peak efficiency - flow during surge).

[0060] In an optional embodiment, the step of controlling the opening and closing degree of the throttle valve according to the working state of the air compressor and the target efficiency range specifically includes:

[0061] Obtaining a current flow rate at a current speed of the air compressor and a target working flow rate in a target efficiency range at the current speed, and / or obtaining a current pressure ratio at a current speed of the air compressor and a target pressure ratio in a target efficiency range at the current speed;

[0062] The opening and closing degree of the throttle valve is controlled according to the current flow rate and the target operating flow rate in the target efficiency range at the current speed, and / or according to the current pressure ratio and the target pressure ratio.

[0063] In this embodiment, the air compressor can be accurately operated in the target efficiency range by controlling the opening and closing degree.

[0064] In this embodiment, when the air compressor is in the surge range, the opening and closing degree of the throttle valve is controlled to make the air compressor leave the surge range. When the air compressor is in the surge range, the opening and closing degree of the throttle valve is controlled to make the air compressor operate in the target efficiency range.

[0065] Example 2

[0066] This embodiment provides a control system for an air compressor. Figure 3 .

[0067] The control system of the air compressor includes an acquisition module 201, a surge release module 202 and a target efficiency control module 203;

[0068] The acquisition module 201 is used to obtain the surge range of the air compressor;

[0069] The surge release module 202 is used to control the opening and closing degree of the throttle valve when the working state of the air compressor is in the surge range, so as to make the air compressor leave the surge range;

[0070] The target efficiency control module 203 is used to control the opening and closing degree of the throttle valve according to the working state of the air compressor and the target efficiency range when the working state of the air compressor is not in the surge range, so as to make the air compressor operate in the target efficiency range.

[0071] In this embodiment, the working state of the air compressor can be determined by the pressure ratio and flow rate of the air compressor.

[0072] In the above embodiment, the target efficiency control module 203 can also be used when the working state of the air compressor is not in the surge range, which can specifically include: when the working state of the air compressor is in the critical surge range of the air compressor (for example, the difference between the flow rate of the air compressor and the surge flow rate where surge occurs is less than the preset flow difference; or the difference between the pressure ratio of the air compressor and the surge pressure ratio where surge occurs is less than the preset pressure ratio difference), controlling the opening and closing degree of the throttle valve to make the air compressor operate in the target efficiency range.

[0073] In the above embodiment, controlling the opening and closing degree of the throttle should not be limited to being understood as controlling the throttle all the time, but also includes controlling the opening and closing degree of the throttle at a certain time interval. For example, if the throttle opens 10% per second, the opening and closing degree at the 0th second is 10%, and the opening and closing degree at the 1st second is 20%. The opening and closing degree in the above embodiment can be continuously changing from the 0th second to the 1st second, or a signal can be given to the throttle at the 1st second, so that the opening and closing degree of the throttle at the 1st second is directly 20%.

[0074] In this embodiment, the surge escape mode 202 can also increase the opening and closing degree of the throttle valve in a fixed step length, and adjust according to the fixed step length until the surge interval is exited.

[0075] In an optional embodiment, the surge disengagement module 202 is used to increase the opening and closing degree of the throttle valve if the air compressor is still in the surge range after a first time period after controlling the throttle valve opening and closing parameters when the air compressor is in the surge range.

[0076] In an optional embodiment, the surge disengagement module 202 is configured to reduce the rotation speed of the air compressor if the air compressor is still in the surge range after the second time period of increasing the opening and closing degree of the throttle valve.

[0077] In an optional embodiment, the acquisition module 201 is further used to acquire the current flow rate at the current speed of the air compressor and the surge flow rate at the current speed, and / or to acquire the current pressure ratio at the current speed of the air compressor and the surge pressure ratio at the current speed;

[0078] And determine whether the air compressor is in the surge range according to the current flow rate and the surge flow rate, and / or according to the current pressure ratio and the surge pressure ratio.

[0079] In this embodiment, if the current flow rate is less than the surge flow rate or the current pressure ratio is less than the surge pressure ratio, it can be determined that the air compressor is in the surge range.

[0080] In this embodiment, it is also possible to determine whether the air compressor is in a surge state and how close the air compressor is to the occurrence of surge by using the pressure surge coefficient and the flow surge coefficient.

[0081] Wherein, pressure surge coefficient = (pressure ratio during surge - actual pressure) / (pressure ratio during surge - pressure ratio during peak efficiency);

[0082] Flow surge coefficient = (actual flow - flow during surge) / (flow at peak efficiency - flow during surge).

[0083] Controlling the opening and closing degree of the throttle valve according to the working state of the air compressor and the target efficiency range specifically includes:

[0084] Obtaining a current flow rate at a current speed of the air compressor and a target working flow rate in a target efficiency range at the current speed, and / or obtaining a current pressure ratio at a current speed of the air compressor and a target pressure ratio in a target efficiency range at the current speed;

[0085] The opening and closing degree of the throttle valve is controlled according to the current flow rate and the target operating flow rate in the target efficiency range at the current speed, and / or according to the current pressure ratio and the target pressure ratio.

[0086] In this embodiment, when the air compressor is in the surge range, the opening and closing degree of the throttle valve is controlled to make the air compressor leave the surge range. When the air compressor is in the surge range, the opening and closing degree of the throttle valve is controlled to make the air compressor operate in the target efficiency range.

[0087] Example 3

[0088] Figure 4 The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the air compressor control method of Example 1 is implemented. Figure 4 The electronic device 30 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0089] like Figure 4 As shown, the electronic device 30 may be in the form of a general-purpose computing device, for example, it may be a server device. The components of the electronic device 30 may include, but are not limited to: at least one processor 31, at least one memory 32, and a bus 33 connecting different system components (including the memory 32 and the processor 31).

[0090] The bus 33 includes a data bus, an address bus, and a control bus.

[0091] The memory 32 may include a volatile memory, such as a random access memory (RAM) 321 and / or a cache memory 322 , and may further include a read-only memory (ROM) 323 .

[0092] The memory 32 may also include a program / utility 325 having a set (at least one) of program modules 324, such program modules 324 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0093] The processor 31 executes various functional applications and data processing by running the computer program stored in the memory 32, such as the control method of the air compressor of the first embodiment of the present invention.

[0094] The electronic device 30 may also communicate with one or more external devices 34 (e.g., keyboards, pointing devices, etc.). Such communication may be performed via an input / output (I / O) interface 35. Furthermore, the model-generated device 30 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 36. As shown, the network adapter 36 communicates with other modules of the model-generated device 30 via a bus 33. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the model-generated device 30, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (RAID) systems, tape drives, and data backup storage systems.

[0095] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to an embodiment of the present invention, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided into multiple units / modules to be embodied.

[0096] Example 4

[0097] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the air compressor control method of embodiment 1 is implemented.

[0098] The readable storage medium may include but is not limited to: a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device or any suitable combination of the above.

[0099] In a possible implementation manner, the present invention may also be implemented in the form of a program product, which includes a program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute the air compressor control method of embodiment 1.

[0100] Among them, the program code for executing the present invention can be written in any combination of one or more programming languages, and the program code can be executed completely on the user device, partially on the user device, as an independent software package, partially on the user device and partially on a remote device, or completely on the remote device.

[0101] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A method for controlling an air compressor, characterized in that: The control method comprises the following steps: Get the surge range of the air compressor; When the working state of the air compressor is in the surge range, the opening and closing degree of the throttle valve is controlled. After the first time period, if the air compressor is still in the surge range, the opening and closing degree of the throttle valve is increased. After the second time period, if the air compressor is still in the surge range, the speed of the air compressor is reduced to make the air compressor out of the surge range. When the working state of the air compressor is not in the surge range, the opening and closing degree of the throttle valve is controlled according to the working state of the air compressor and the target efficiency range, so that the air compressor operates in the target efficiency range; The step of controlling the opening and closing degree of the throttle valve according to the working state of the air compressor and the target efficiency range specifically includes: Obtaining a current flow rate at a current speed of the air compressor and a target working flow rate in a target efficiency range at the current speed, and / or obtaining a current pressure ratio at a current speed of the air compressor and a target pressure ratio in a target efficiency range at the current speed; The opening and closing degree of the throttle valve is controlled according to the current flow rate and the target working flow rate in the target efficiency range at the current speed, and / or according to the current pressure ratio and the target pressure ratio.

2. The air compressor control method according to claim 1, characterized in that: After the step of obtaining the surge range of the air compressor, the control method further includes: Obtaining a current flow rate at a current speed of the air compressor and a surge flow rate at the current speed, and / or obtaining a current pressure ratio at a current speed of the air compressor and a surge pressure ratio at the current speed; It is determined whether the air compressor is in a surge range according to the current flow rate and the surge flow rate, and / or according to the current pressure ratio and the surge pressure ratio.

3. A control system for an air compressor, characterized in that: The control system includes an acquisition module, a surge disengagement module and a target efficiency control module; The acquisition module is used to acquire the surge range of the air compressor; The surge separation module is used to control the opening and closing degree of the throttle valve when the working state of the air compressor is in the surge interval. After the first time period, if the air compressor is still in the surge interval, the opening and closing degree of the throttle valve is increased. After the second time period, if the air compressor is still in the surge interval, the speed of the air compressor is reduced to make the air compressor leave the surge interval. The target efficiency control module is used to control the opening and closing degree of the throttle valve according to the working state of the air compressor and the target efficiency range when the working state of the air compressor is not in the surge range, so as to make the air compressor operate in the target efficiency range; The target efficiency control module is specifically used to obtain the current flow rate of the air compressor at the current speed and the target working flow rate of the target efficiency range at the current speed, and / or to obtain the current pressure ratio of the air compressor at the current speed and the target pressure ratio of the target efficiency range at the current speed; The opening and closing degree of the throttle valve is controlled according to the current flow rate and the target working flow rate in the target efficiency range at the current speed, and / or according to the current pressure ratio and the target pressure ratio.

4. The air compressor control system according to claim 3, characterized in that: The surge release module is used to increase the opening and closing degree of the throttle valve after a first time period after controlling the throttle valve opening and closing parameters when the air compressor is in the surge range, if the air compressor is still in the surge range.

5. The air compressor control system according to claim 4, characterized in that: The surge release module is used to reduce the rotation speed of the air compressor if the air compressor is still in the surge range after the second time period of increasing the opening and closing degree of the throttle valve.

6. The air compressor control system according to claim 3, characterized in that: The acquisition module is also used to acquire the current flow rate of the air compressor at the current speed and the surge flow rate at the current speed, and / or to acquire the current pressure ratio of the air compressor at the current speed and the surge pressure ratio at the current speed; And according to the current flow rate and the surge flow rate, and / or, according to the current pressure ratio and the surge pressure ratio, it is determined whether the air compressor is in the surge range.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the air compressor control method according to any one of claims 1 to 2 is implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the air compressor control method according to any one of claims 1 to 2 is implemented.

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