Fluid injection control system and fluid circulation system

Abstract

The embodiment of the invention provides a fluid injection control system, a fluid injection control method and a fluid circulation system with the fluid injection valve control system. The fluid injection control system includes an injection valve located in a path through which fluid flows into an apparatus, a control device, and an energy storage device configured to continue to supply power to the control device to maintain operation of the control device when the control device is powered down.

Description

[0001] This application is a divisional application of the Chinese invention patent application with application number 201711306378.4 (application date: December 8, 2017; invention name: fluid injection control system and fluid circulation system). Technical Field

[0002] Embodiments of the present invention relate to the field of control, and more particularly, to a fluid injection control system and a fluid circulation system having the injection valve control system. Background Art

[0003] In some process control systems, such as in refrigeration systems, a compressor is used to compress fluids such as refrigerants and lubricants from an evaporator, for example, and then transport them to a condenser. When the load increases, it is necessary to increase the speed of the compressor to increase the fluid flow rate to meet the load requirements. However, as the speed of the compressor increases, the temperature of the fluid discharged from the compressor increases accordingly, resulting in degradation of fluid performance, such as a decrease in the refrigeration performance of the refrigerant or the performance of the lubricating oil, which reduces the efficiency of the compressor and reduces the reliability and stability of the system. In order to ensure the normal operation of the compressor and the corresponding system, the controller can be used to control the liquid injection valve to directly inject the fluid discharged from the outlet of the condenser into the compressor to reduce the discharge fluid temperature of the compressor.

[0004] When the controller loses power, for example, when the voltage supplied to the controller is insufficient or reduced, or when the controller is powered off, the controller cannot continue to control the injection valve. In order to prevent the injection valve from maintaining the opening before power failure and continuing to inject fluid into the compressor, the system usually requires an additional solenoid valve to prevent fluids such as refrigerant from being injected into the compressor through the injection valve. This control method increases the complexity of the entire system control and the cost for customers to purchase solenoid valves and related control circuits and installation. Summary of the invention

[0005] An object of the present invention is to overcome at least one of the above and other problems and drawbacks in the prior art.

[0006] An embodiment of one aspect of the present invention provides a fluid injection control system, including an injection valve, a control device and an energy storage device, wherein the injection valve is located in a path where fluid flows into a device, the energy storage device is configured to continue to supply power to the control device to maintain operation of the control device when power is lost to the control device, and the control device is configured to control the injection valve to close when power is lost to the control device.

[0007] In one embodiment, the control device is further configured to control the opening degree of the injection valve in a power-on state of the control device to control the flow rate of the fluid injected into the device through the injection valve.

[0008] In one embodiment, the fluid injection control system further includes a power failure detection circuit configured to detect a state in which the external power source supplies power to the control device and send a power failure signal to the control device when power is lost from the external power source.

[0009] In one embodiment, the fluid injection control system further includes a valve drive circuit configured to control the opening of the injection valve, and the control device is further configured to send a valve closing signal to the valve drive circuit upon receiving the power-off signal, so that the valve drive circuit closes the injection valve.

[0010] In one embodiment, the valve driving circuit is configured to control a valve driving mechanism to drive the injection valve to open with a controlled opening degree or to drive the injection valve to close.

[0011] In one embodiment, the energy storage device is further configured to continue to supply power to at least one of the valve drive circuit and the valve drive mechanism when the control device loses power.

[0012] In one embodiment, the energy storage device is electrically connected to an external power source that supplies power to the control device.

[0013] In one embodiment, the energy storage device comprises a supercapacitor or a rechargeable battery.

[0014] In one embodiment, the energy storage device is directly electrically connected to the control device.

[0015] In one embodiment, the energy storage device is electrically connected to the control device via a switch, and the first switch is turned on when the control device is powered off so that the electrical energy from the energy storage device continues to be supplied to the control device via the switch.

[0016] In one embodiment, the switch comprises a diode or a MOS transistor.

[0017] In one embodiment, at least one of the energy storage device and the power failure detection circuit is integrated with the control device in a same controller.

[0018] Another embodiment of the present invention provides a fluid circulation system, comprising the fluid injection control system described in any embodiment of the present invention and the device, wherein the fluid injection control system controls the injection of fluid into the device.

[0019] In one embodiment, the device includes a compressor, and the fluid circulation system also includes an evaporator and a condenser, the compressor, condenser and evaporator are connected in sequence through pipelines to form a fluid circulation loop, and the injection valve is arranged in the path of the fluid flowing from the outlet of the condenser into the compressor.

[0020] In one embodiment, the fluid circulation system further comprises a temperature detection device, which is configured to detect the temperature of the fluid flowing out of the outlet of the device and send a temperature signal indicating the temperature to the control device, and the control device is further configured to determine whether the temperature of the fluid flowing out of the outlet of the device exceeds a threshold value based on the temperature signal, and control the injection valve to inject fluid into the device to reduce the temperature of the fluid flowing out of the outlet of the device when the threshold value is exceeded.

[0021] Another embodiment of the present invention further provides a fluid injection control method, comprising: using the fluid injection control system described in any embodiment of the present invention to control the injection of fluid into the device.

[0022] In one embodiment, using the fluid injection control system to control the injection of fluid into the device includes:

[0023] Detecting a state in which an external power source supplies power to the control device;

[0024] Determining whether the control device is powered off according to the detected state; and

[0025] When the control device loses power, the energy storage device continues to supply power to the control device, so that the control device closes the injection valve to prevent the fluid in the path from being injected into the device through the injection valve.

[0026] Other objects and advantages of the present invention will become apparent from the following detailed description of the present invention with reference to the accompanying drawings, which will help to have a comprehensive understanding of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] These and / or other aspects, features and advantages of the present invention will become apparent and readily understood from the following description of illustrative embodiments taken in conjunction with the accompanying drawings, in which:

[0028] Figure 1 is a schematic diagram showing a fluid circulation system according to an exemplary embodiment of the present invention;

[0029] Figure 2 is a block diagram schematically illustrating a fluid injection control system according to an exemplary embodiment of the present invention;

[0030] Figure 3 is a block diagram schematically illustrating a fluid injection control system according to another exemplary embodiment of the present invention;

[0031] Figure 4 is a block diagram schematically illustrating a fluid injection control system according to yet another exemplary embodiment of the present invention; and

[0032] Figure 5 is a flow chart schematically illustrating a fluid ejection control method according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0033] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In this specification, the same or similar components are indicated by the same or similar reference numerals.

[0034] In addition, in the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, it is apparent that one or more embodiments may be implemented without these specific details. In other cases, well-known structures and devices are embodied in a schematic manner to simplify the drawings.

[0035] According to a general inventive concept of the present invention, an energy storage device is combined in a system having an injection valve for injecting fluid into a device. The energy storage device continues to supply power to the control device when the control device controlling the injection valve loses power, so that the control device can close the injection valve to prevent the fluid from continuing to be injected into the device through the injection valve, thereby eliminating the need for an additional solenoid valve to cut off the supply of fluid to the device.

[0036] The following description of various embodiments of the present invention with reference to the accompanying drawings is intended to illustrate the inventive concept of the present invention and should not be construed as limiting the present invention.

[0037] Figure 1 A fluid circulation system according to an exemplary embodiment of the present invention is schematically shown, and the fluid circulation system can be, for example, a refrigeration or air-conditioning system, for circulating a fluid such as a refrigerant, a lubricant, etc. through a circuit. The fluid circulation system generally includes a plurality of devices positioned in the circuit and fluidically connected to each other, including devices 1, 2, and 3 as shown in the figure. Exemplarily, device 1 can be a compressor, device 2 can be a condenser, and device 3 can be an evaporator. The compressor, condenser, and evaporator are connected in sequence, for example, through a pipeline to form a fluid circulation loop. It can be understood that the present invention is not limited to this, and the fluid circulation system can also include additional or replacement devices for circulating the fluid. The following is a detailed description of an embodiment of the present invention only by taking a fluid circulation system including a compressor 1, a condenser 2, and an evaporator 3 as an example.

[0038] Illustratively, in a refrigeration or air conditioning system, the rotation of the compressor timely extracts the fluid (such as refrigerant) in the evaporator connected thereto, compresses the low-temperature and low-pressure fluid entering therein into a high-temperature and high-pressure fluid, and delivers the high-temperature and high-pressure fluid to the condenser. The condenser, as a heat exchange device, makes the high-temperature and high-pressure fluid from the compressor exchange heat with the external cooling medium (air or water, etc.), so that the high-temperature and high-pressure fluid entering therein is cooled and condensed into a high-pressure and normal-temperature fluid, and the evaporator, as another heat exchange device, evaporates the fluid from the condenser into a steam fluid, absorbs the heat of the cooled substance, and achieves the purpose of refrigeration. In some examples, a throttling element (such as a throttling valve or an expansion valve) can also be provided upstream of the evaporator, which converts the high-pressure and normal-temperature fluid from the condenser into a low-temperature and low-pressure fluid, and then delivers the low-temperature and low-pressure fluid to the evaporator for heat absorption and evaporation.

[0039] During the operation of the compressor, when it is overloaded or under high pressure, the compressor motor and compressor components will heat up seriously, resulting in reduced compressor efficiency and reduced system reliability and stability. In order to ensure the normal operation of the compressor and the corresponding system, such as Figure 1 As shown, the fluid circulation system according to the embodiment of the present invention further includes a fluid injection control system 100, which is used to inject fluid into the compressor, such as into its suction pipe or compression chamber, to reduce the temperature of its motor or components, thereby adjusting the capacity of the compressor by injecting liquid and improving the efficiency of the compressor. In the illustrated embodiment, the fluid injection control system 100 directly injects a portion of the fluid discharged from the outlet of the condenser 2 into the compressor 1 (without passing through the evaporator).

[0040] like Figure 1 As shown, the fluid injection control system 100 includes an injection valve or liquid injection valve 101 and a control device 102. The injection valve or liquid injection valve 101 is positioned in the path of the fluid flowing from the outlet of the condenser 2 into the compressor 1. The control device 102 is configured to control the injection valve or liquid injection valve 101 to inject a suitable amount of cooling fluid into the compressor 1 when necessary (such as when the temperature of the discharge fluid of the compressor is too high, when the compressor motor and compressor parts are seriously heated, etc.). The control device controls the opening of the injection valve in its power-on state (including but not limited to controlling the injection valve to open with a controlled opening, controlling the injection valve to close, etc.) to control the flow rate of the fluid injected into the compressor through the injection valve.

[0041] In an exemplary embodiment, Figure 1 As shown, a temperature detection device 107 is also provided at the outlet or downstream of the compressor 1 (see Figure 2-4), the temperature detection device 107 can detect the temperature of the fluid flowing out of the outlet of the compressor 1 and send a temperature signal T indicating the temperature to the control device 102. The control device 102 determines whether the compressor 1 is operating normally or overheating according to the temperature signal, such as determining whether the temperature of the fluid discharged from the compressor 1 is too high or exceeds a threshold value, and when the temperature of the fluid discharged from the compressor 1 is too high or exceeds the threshold value, controls the injection valve 101 to inject cooling fluid into the compressor 1, such as the fluid whose temperature has been reduced from the condenser 2.

[0042] In the event of a power failure to the control device 102, for example, when the voltage supplied from the external power supply to the control device 102 is insufficient or reduced, or when the power is cut off, the control device cannot continue to control the injection valve or the liquid injection valve 101 will maintain the opening before the power failure, and the fluid continues to enter the compressor 1 through the valve 101. In order to continue to control the injection valve when the control device loses power, an energy storage device 103 is provided or combined in the fluid injection control system 100 according to an embodiment of the present invention, and is configured to continue to supply power to the control device 102 when the control device loses power to maintain the operation of the control device, so that the control device can continue to control the operation of the injection valve. In one example, when the control device loses power and the energy storage device continues to supply power to the control device, the control device closes the injection valve to prevent the fluid from continuing to be injected into the compressor through the injection valve. For example, when the control device loses power but the energy storage device continues to supply power to the control device, the control device 102 sends a valve closing signal to close the injection valve 101 to prevent the fluid from continuing to be injected into the compressor 1 through the injection valve 101, thereby eliminating the need for an additional solenoid valve to cut off the injection of the fluid into the compressor 1 through the injection valve or liquid injection valve 101.

[0043] In some examples, such as Figure 1 and 2 As shown, the energy storage device 103 is directly electrically connected to the control device 102, so that once the control device 102 loses power due to insufficient or reduced voltage or power failure of the external power supply, the energy storage device 103 immediately continues to supply power to the control device 102. In other embodiments, the energy storage device 103 can be electrically connected to the control device 102 operatively or as needed, for example, Figure 3 As shown, the energy storage device 103 is electrically connected to the control device 102 via a switch K, or as shown in FIG. Figure 4 As shown, the energy storage device 103 is electrically connected to the control device 102 through a normally open first switch K1. When the control device 102 loses power or needs to provide additional electric power to the control device, the switch is turned on or closed to electrically connect the energy storage device 103 and the control device 102. The opening and closing / connection of the switch can be performed manually or automatically according to a trigger signal as described below.

[0044] Figure 2A fluid injection control system according to an exemplary embodiment of the present invention is schematically shown. As shown in the figure, the fluid injection control system 100 further includes a power failure detection circuit 104, which is configured to detect the state of the external power supply 10 supplying power to the control device 102 and at least send a power failure signal S0 to the control device 102 when the control device 102 loses power due to insufficient power supply from the external power supply 10, and the control device 102, which is continuously powered by the energy storage device 103 when the power fails, sends a closing signal to the injection valve 101 according to the power failure signal S0, so as to close the injection valve 101 and prevent or cut off the fluid from continuing to be injected into the compressor 1 through the injection valve or the liquid injection valve 101.

[0045] The power failure of the control device can be detected by various forms of circuit structures or detection devices. For example, a power failure detection circuit can be composed of a transformer coil, a transistor structure, a trigger, a resistor, an operational amplifier, an optocoupler, etc., which is arranged in a line that supplies power to the control device from an external power supply or is connected to the line, so as to timely generate and at least send a power failure signal or a trigger signal, such as a single pulse signal, to the control device when the control device loses power due to insufficient or reduced power supply or power outage of the external power supply.

[0046] exist Figure 2 In the embodiment illustrated in the figure, the fluid injection control system 100 may also include a valve drive circuit 105, which is electrically connected to the control device 102 to receive a control signal S (such as a valve closing signal or a valve opening signal) from the control device 102, and sends a drive signal S1 to a valve drive mechanism 106 according to the control signal S. The valve drive mechanism 106 drives the injection valve 101 to open at a controlled opening or drives the injection valve to close according to the drive signal S1, thereby controlling the injection of fluid into the compressor 1 through the valve 101.

[0047] When the control device 102 loses power, the control device 102, which is continuously powered by the energy storage device 103, sends a valve closing signal to the valve drive circuit 105 according to the power-off signal received from the power-off detection circuit 104, so that the valve drive circuit 105 drives the injection valve 101 to close through the valve drive mechanism 106, thereby timely preventing the fluid from continuing to be injected into the compressor 1 through the valve 101. In some examples, the valve drive mechanism may include a stepper motor, but the present invention is not limited thereto, and other drive mechanisms that can cause the injection valve to open or close may also be used in other examples.

[0048] According to some embodiments of the present invention, Figure 2-4 As shown, the energy storage device 103 can also be electrically connected to the valve drive circuit 105 and / or the valve drive mechanism 106 to continue to supply power to at least one of the valve drive circuit 105 and the valve drive mechanism 106 when the control device 102 loses power, so as to ensure that they have sufficient electrical energy to drive the injection valve 101 to close.

[0049] exist Figure 2 In the embodiment shown in , the energy storage device 103 is directly electrically connected to the control device 102, the valve drive circuit 105 and the valve drive mechanism 106 so as to continue to supply them with electrical energy sufficient to cause the injection valve 101 to close immediately when a power failure occurs to them.

[0050] exist Figure 3 In the embodiment shown in , the energy storage device 103 is electrically connected to the control device 102, the valve drive circuit 105 and the valve drive mechanism 106 through the switch K, and the switch K is turned on when the control device loses power so that the electric energy from the energy storage device is continuously supplied to the control device 102, the valve drive circuit 105 and / or the valve drive mechanism 106 through the switch. As shown in the figure, the switch K can be electrically connected to the path from the external power supply to the control device. Exemplarily, the switch K may include a diode, such as a reverse diode, or include a MOS transistor, such as a PMOS transistor, and when the control device loses power, such as when the voltage supplied to the control device by the external power supply drops below the normal operating voltage, this form of switch is turned on, so that the energy storage device continues to supply power to the control device, the valve drive circuit and / or the valve drive mechanism.

[0051] And in Figure 4 In the embodiment shown in , the energy storage device 103 is electrically connected to the control device 102 through the normally open first switch K1, is electrically connected to the valve drive circuit 105 through the normally open second switch K2, and is electrically connected to the valve drive mechanism 106 through the normally open third switch K3. The opening and closing of the switches K1, K2, and K3 can be performed manually, or automatically according to the corresponding trigger signals received by them. For example, the trigger signal can come from the power failure detection circuit 104, the control device 102, or other trigger mechanisms. Exemplarily, when the power supply from the external power supply 10 to the control device 102 fails, the power failure detection circuit 104, in addition to sending the power failure signal S0 to the control device 102, also sends corresponding trigger signals to the switches K1, K2, and K3 at the same time, so as to automatically close these switches and electrically connect the energy storage device 103 with the control device 102, the valve drive circuit 105, and the valve drive mechanism 106. Alternatively or additionally, the power failure detection circuit or the control device may provide a power failure prompt to the operator so that the operator can be aware of the power failure of the control device or perform corresponding processing.

[0052] In another embodiment, the energy storage device 103 may also be directly or indirectly electrically connected to the power failure detection circuit 104, so that when the above-mentioned power failure occurs, power is also supplied to the power failure detection circuit 104, ensuring that the power failure detection circuit 104 can continuously or at least provide a power failure signal or a trigger signal for a period of time. In other embodiments, the power failure detection circuit 104 may also detect whether the power supply from the external power supply 10 to the control device 102 has returned to normal, and send a signal to the control device 102 when the power supply has returned to normal, so that the control device 102 can resume the injection of the fluid into the compressor 1 through the injection valve 101 or stop the injection. In addition, when the power supply returns to normal, the switches K1, K2, and K3 can be manually disconnected, or the power failure detection circuit 104 can send a disconnection trigger signal to these switches again to automatically disconnect these switches, and the above-mentioned switch K can be automatically disconnected or cut off to disconnect the power supply from the energy storage device to the control device.

[0053] exist Figure 2-4 In the illustrated embodiment, a power conversion circuit 110 may also be provided to convert the voltage from the external power supply 10 into a voltage suitable for normal operation of the control device 102 , the valve drive circuit 105 , the valve drive mechanism 106 and / or the power failure detection circuit 104 .

[0054] In some embodiments, Figure 2-4 As shown, the energy storage device 102 can be electrically connected (for example, through the power conversion circuit 110) to the external power supply 10 that supplies power to the control device 102. In other embodiments, the energy storage device can also be electrically connected to other power supply devices or systems, so that when the control device is not powered off, sufficient electrical energy can be stored in the energy storage device, so that when the above-mentioned power failure occurs, the control device, the valve drive circuit, the valve drive mechanism and / or the power failure detection circuit can be supplied with electrical energy sufficient to cause the injection valve to close. Exemplarily, the energy storage device includes a supercapacitor or a rechargeable battery.

[0055] According to some embodiments of the present invention, one or both of the energy storage device and the power failure detection circuit can be integrated or combined in the same or a single controller, such as integrated on the same circuit board, so as to provide an integrated liquid injection controller that can control the injection or injection of fluid into a device such as a compressor, and when the power supply to the controller by the external power supply fails, the integrated energy storage device can continue to supply power to the controller, so that the controller controls the liquid injection valve to close and prevents the fluid from continuing to be injected into the device. In some other embodiments, the energy storage device can be externally connected to the control device. The control device can include a processor, such as an MCU. In addition, the power conversion circuit, the valve drive circuit, etc. can also be integrated or combined with the control device in the same or a single controller.

[0056] An embodiment of the present invention further provides a fluid injection control method, which can use the fluid injection control system provided in any of the above embodiments to control the injection or injection of fluid into the device. Figure 5 As shown, the method may include a step S11 of determining or judging whether the power supply of the external power supply to the control device is cut off. The method may also include a step S12, in which the state of the power supply of the external power supply to the control device can be detected by a power-off detection circuit to determine whether the control device is cut off according to the detected state, as described above. When it is determined that the control device has a power-off situation, the energy storage device continues to supply power to the control device in step S13, so that the control device closes the injection valve to prevent the fluid from being injected into the device through the injection valve. When it is determined that the control device has not a power-off situation, the control device normally controls the injection valve to open or close as needed in step S14 to control the injection of the fluid into the device through the injection valve. At the same time, the state of the power supply of the external power supply to the control device can be continuously detected in step S12 to timely determine whether the control device has a power-off situation.

[0057] Although the present invention is described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify the preferred embodiments of the present invention and should not be construed as limiting the present invention. The size ratios in the drawings are merely illustrative and should not be construed as limiting the present invention.

[0058] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined by the claims and their equivalents.

Claims

1. A fluid injection control system (100), comprising an injection valve (101), a control device (102) and an energy storage device (103); The injection valve is located in the path of the fluid flowing into the device (1). The energy storage device is configured to continue to supply power to the control device to maintain the operation of the control device when power is lost from an external power source other than the energy storage device. The control device is configured to control the injection valve to close under the power supply from the energy storage device when the power supply from the external power supply to the control device is lost, so as to prevent the fluid from being injected into the device along the injection valve. in, The fluid injection control system excludes the additional solenoid valve.

2. The fluid injection control system according to claim 1, wherein: The control device is further configured to control the opening degree of the injection valve in a power-on state of the control device to control the flow rate of the fluid injected into the device through the injection valve.

3. The fluid injection control system of claim 1 , further comprising: A power failure detection circuit (104) is configured to detect the state of power supply from an external power source (10) to a control device, and to send a power failure signal to the control device when power supply from the external power source to the control device fails.

4. The fluid injection control system of claim 3, further comprising: a valve driving circuit (105) configured to control the opening of the injection valve, The control device is further configured to send a valve closing signal to the valve driving circuit when receiving the power-off signal, so that the valve driving circuit closes the injection valve.

5. The fluid injection control system of claim 4, wherein: The valve driving circuit is configured to control a valve driving mechanism (106) to drive the injection valve to open at a controlled opening or to drive the injection valve to close.

6. The fluid injection control system of claim 5, wherein: The energy storage device is further configured to continue to supply power to at least one of the valve drive circuit and the valve drive mechanism when the control device loses power.

7. The fluid injection control system according to any one of claims 1 to 6, wherein: The energy storage device is electrically connected to an external power source that supplies power to the control device.

8. The fluid injection control system according to any one of claims 1 to 6, wherein: The energy storage device includes a supercapacitor or a rechargeable battery.

9. The fluid injection control system according to any one of claims 1 to 6, wherein: The energy storage device is directly electrically connected to the control device.

10. The fluid injection control system according to any one of claims 1 to 6, wherein: The energy storage device is electrically connected to the control device via a switch, and the switch is turned on when the control device is powered off so that the electric energy from the energy storage device is continuously supplied to the control device via the switch.

11. The fluid injection control system of claim 10, wherein: The switch includes a diode or a MOS transistor.

12. The fluid injection control system according to any one of claims 3 to 6, wherein: At least one of the energy storage device and the power-off detection circuit is integrated with the control device in the same controller.

13. A fluid circulation system, comprising the fluid injection control system according to any one of claims 1 to 12 and the device, wherein the fluid injection control system controls the injection of fluid into the device.

14. The fluid circulation system according to claim 13, wherein: The device includes a compressor, and the fluid circulation system also includes an evaporator and a condenser, the compressor, the condenser and the evaporator are connected in sequence through a pipeline to form a fluid circulation loop. The injection valve is disposed in a path where the fluid flows from the outlet of the condenser into the compressor.

15. The fluid circulation system according to claim 13 or 14, wherein: The fluid circulation system further comprises a temperature detection device configured to detect the temperature of the fluid flowing out of the outlet of the device and send a temperature signal indicating the temperature to the control device, and The control device is further configured to determine whether the temperature of the fluid flowing out of the outlet of the device exceeds a threshold value based on the temperature signal, and control the injection valve to inject fluid into the device to reduce the temperature of the fluid flowing out of the outlet of the device when the threshold value is exceeded.

16. A fluid injection control method, comprising: The fluid injection control system according to any one of claims 1 to 12 is used to control the injection of fluid into the device.

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