Circulation pipeline control method and device and readable storage medium

Abstract

The invention provides a control method and device of a circulation pipeline and a readable storage medium, and relates to the technical field of heat management. The method comprises the steps that the state of fluid in the pipeline is detected to obtain a detection value, and the rotating speed of the first circulating pump and the rotating speed of the second circulating pump are controlled according to the detection value to prevent fluid channeling between the first fluid supplementing opening and the second fluid supplementing opening through the expansion device. According to the control method, fluid channeling possibly occurring between the first fluid supplementing opening and the second fluid supplementing opening can be prevented, or the fluid channeling phenomenon between the first fluid supplementing opening and the second fluid supplementing opening can be improved or eliminated when fluid channeling occurs.

Description

Technical Field

[0001] The present application relates to the field of thermal management technology, and in particular to a control method, device and readable storage medium for a circulation pipeline. Background Art

[0002] The thermal management system of electric vehicles generally includes circulation pipelines such as cooling circuits, constant temperature circuits and heating circuits, and each circuit is separately provided with a circulation pump and a fluid filling port. In some scenarios, the cooling circuit may be connected in series with the constant temperature circuit to form a circulation pipeline. At this time, the circulation pipeline contains both the circulation pump of the cooling circuit and the circulation pump of the constant temperature circuit, and the circulation pipeline contains both the fluid filling port of the cooling circuit and the fluid filling port of the constant temperature circuit.

[0003] At this time, since there are multiple fluid infusion ports in the circulation pipeline, there may be a pressure difference between two fluid infusion ports, so that cross-flow may occur between the two fluid infusion ports through the expansion device. Summary of the invention

[0004] The embodiments of the present application provide a control method, device and readable storage medium for a circulation pipeline, which can prevent crossflow between two fluid infusion ports when there are multiple fluid infusion ports in the circulation pipeline.

[0005] In a first aspect, a control method for a circulation pipeline is provided, wherein a first circulation pump, a second circulation pump, a first fluid infusion port, and a second fluid infusion port are provided on the circulation pipeline, and the first fluid infusion port and the second fluid infusion port are connected to an expansion device through a fluid infusion pipeline, and the control method comprises:

[0006] Detecting the state of the fluid in the pipeline to obtain a detection value;

[0007] The rotation speeds of the first circulation pump and the second circulation pump are controlled according to the detection value to prevent crossflow between the first fluid inlet and the second fluid inlet through the expansion device.

[0008] According to the control method provided in the embodiment of the present application, a detection value that can characterize the state of the fluid in the pipeline is first obtained, and then the rotational speed of the first circulation pump and the second circulation pump is controlled according to the detection value to prevent crossflow between the first fluid infusion port and the second fluid infusion port through the expansion device. This can prevent possible crossflow between the first fluid infusion port and the second fluid infusion port, or improve or eliminate the crossflow phenomenon between the first fluid infusion port and the second fluid infusion port when crossflow occurs.

[0009] When there is no crossflow between the two infusion ports or when the crossflow between the two infusion ports is improved, the circulation performance of the circulation pipeline can be guaranteed, thereby ensuring the performance of the thermal management system. At the same time, crossflow between the first infusion port and the second infusion port can be prevented by controlling the circulation pump. This problem can be solved by a software control method. At this time, only a simple improvement can be made to the hardware structure of the thermal management system or no improvement can be made to the hardware structure of the thermal management system, thereby reducing the hardware cost of the thermal management system.

[0010] As an optional implementation manner, controlling the first circulation pump and the second circulation pump according to the detection value includes:

[0011] Determine a first pressure drop and a second pressure drop according to the detection value, wherein the first pressure drop is a pressure drop between the outlet of the first circulation pump and the first liquid replenishing port, and the second pressure drop is a pressure drop between the outlet of the second circulation pump and the second liquid replenishing port;

[0012] The rotation speeds of the first circulation pump and the second circulation pump are controlled according to the first pressure drop and the second pressure drop.

[0013] In the embodiment of the present application, the pressure drop between the circulation pump and the infusion port can accurately characterize the resistance of the fluid between the circulation pump and the corresponding infusion port. Therefore, when the rotation speeds of the first circulation pump and the second circulation pump are controlled according to the pressure drop between the circulation pump and the infusion port, the pressure difference between the first infusion port and the second infusion port can be reduced, thereby improving or eliminating the crossflow phenomenon between the first infusion port and the second infusion port through the expansion device.

[0014] As an optional implementation manner, controlling the rotation speeds of the first circulation pump and the second circulation pump according to the first pressure drop and the second pressure drop includes:

[0015] determining a speed ratio between the first circulation pump and the second circulation pump according to the first pressure drop and the second pressure drop;

[0016] The rotational speeds of the first circulation pump and the second circulation pump are controlled according to the rotational speed ratio.

[0017] In the embodiment of the present application, the speed ratio is determined according to the first pressure drop and the second pressure drop, and the speeds of the first circulation pump and the second circulation pump are controlled according to the speed ratio. The speed of the first circulation pump can be matched with the resistance encountered by the fluid between the first circulation pump and the first fluid infusion port, and the speed of the second circulation pump can be matched with the resistance encountered by the fluid between the second circulation pump and the second fluid infusion port. This can reduce or eliminate the pressure difference between the first fluid infusion port and the second fluid infusion port, thereby preventing crossflow between the first fluid infusion port and the second fluid infusion port.

[0018] As an optional implementation manner, at least one resistance component is provided between the first circulation pump and the first fluid insufflation port, and between the second circulation pump and the second fluid insufflation port, and determining the first pressure drop and the second pressure drop according to the detection value includes:

[0019] determining the pressure drop of the fluid on the resistance component according to the detection value;

[0020] The first pressure drop and the second pressure drop are determined according to the pressure drop of the fluid on the resistance component.

[0021] In the embodiment of the present application, the pressure drop of the fluid between the outlet of the circulation pump and the corresponding fluid infusion port is determined based on the pressure drop of the fluid on the resistance component, so that a more accurate first pressure drop and a second pressure drop can be determined, so that the first circulation pump and the second circulation pump can be more accurately controlled based on the first pressure drop and the second pressure drop.

[0022] As an optional implementation manner, determining the pressure drop of the fluid on the resistance component according to the detection value includes:

[0023] determining a predicted pressure drop corresponding to the detected value from a pressure drop mapping table of the resistance component;

[0024] The pressure drop of the fluid on the resistance component is determined based on the predicted pressure drop.

[0025] In the embodiment of the present application, the pressure drop of the fluid on the resistance component is determined based on the detection value of the fluid and the pressure drop mapping table, so that a more accurate pressure drop of the fluid on the resistance component can be determined, thereby determining a more accurate first pressure drop and a second pressure drop, and more accurately controlling the first circulation pump and the second circulation pump, thereby improving the control effect and better preventing crossflow between the first circulation pump and the second circulation pump.

[0026] As an optional implementation, determining the speed ratio between the first circulation pump and the second circulation pump based on the first pressure drop and the second pressure drop includes: determining a first resistance encountered by the fluid between the first circulation pump and the first fluid insufflation port based on the first pressure drop; determining a second resistance encountered by the fluid between the second circulation pump and the second fluid insufflation port based on the second pressure drop; and determining the speed ratio based on the first resistance and the second resistance.

[0027] In the embodiment of the present application, the resistance can accurately characterize the pressure loss of the fluid from the circulation pump to the fluid insufflation port, and thus can accurately characterize the pressure of the fluid at the fluid insufflation port. By determining the speed ratio between the two circulation pumps based on the first resistance and the second resistance, the speed of the first circulation pump can be matched with the pressure of the fluid at the first fluid insufflation port, and the speed of the second circulation pump can be matched with the pressure of the fluid at the second fluid insufflation port, thereby reducing or eliminating the pressure difference between the first fluid insufflation port and the second fluid insufflation port, and further preventing cross-flow between the first fluid insufflation port and the second fluid insufflation port.

[0028] As an optional implementation, the detection value includes at least one of a temperature value, a flow value, a flow velocity value and a pressure value of the fluid.

[0029] As an optional implementation manner, the detection value includes a detection value obtained by detecting the fluid in the circulation pipeline, and / or a detection value obtained by detecting the fluid in the fluid infusion pipeline.

[0030] In an embodiment of the present application, when the detection value includes the detection value of the fluid in the circulation pipeline and / or the detection value of the fluid in the infusion pipeline, it is convenient to detect the fluid in the circulation pipeline and obtain the detection value according to actual needs, and / or to detect the fluid in the infusion pipeline and obtain the detection value.

[0031] As an optional implementation, the first circulation pump, the first fluid replenishment port, the second circulation pump and the second fluid replenishment port are sequentially arranged in series on the circulation pipeline; the first fluid replenishment port is arranged at the inlet of the second circulation pump, and the second fluid replenishment port is arranged at the inlet of the first circulation pump.

[0032] In an embodiment of the present application, when the first fluid infusion port is arranged at the inlet of the second circulation pump and the second fluid infusion port is arranged at the inlet of the first circulation pump, it is convenient to determine the position of the fluid infusion port in the circulation pipeline, thereby facilitating detection and obtaining of detection values, as well as facilitating determination of data such as resistance components and pressure drop between the circulation pump and the corresponding fluid infusion port.

[0033] In a second aspect, a control device for a circulation pipeline is provided, wherein a first circulation pump, a second circulation pump, a first fluid infusion port, and a second fluid infusion port are provided on the circulation pipeline, wherein the first fluid infusion port and the second fluid infusion port are connected to an expansion device through a fluid infusion pipeline, and the control device comprises:

[0034] A detection module, used to detect the state of the fluid in the pipeline to obtain a detection value;

[0035] A control module is used to control the rotation speeds of the first circulation pump and the second circulation pump according to the detection value to prevent crossflow between the first fluid infusion port and the second fluid infusion port through the expansion device.

[0036] As an optional implementation, the control module is specifically used to determine a first pressure drop and a second pressure drop based on the detection value, the first pressure drop being the pressure drop between the outlet of the first circulation pump and the first fluid infusion port, and the second pressure drop being the pressure drop between the outlet of the second circulation pump and the second fluid infusion port; and the speeds of the first circulation pump and the second circulation pump are controlled based on the first pressure drop and the second pressure drop.

[0037] As an optional implementation, the control module is specifically used to determine the speed ratio between the first circulation pump and the second circulation pump according to the first pressure drop and the second pressure drop; and control the speeds of the first circulation pump and the second circulation pump according to the speed ratio.

[0038] As an optional implementation, the control module is specifically configured to determine a pressure drop of the fluid on the resistance component according to the detection value; and determine the first pressure drop and the second pressure drop according to the pressure drop of the fluid on the resistance component.

[0039] As an optional implementation, the control module is specifically configured to determine a predicted pressure drop corresponding to the detection value from a pressure drop mapping table of the resistance component; and determine the pressure drop of the fluid on the resistance component according to the predicted pressure drop.

[0040] As an optional implementation, the control module is specifically used to determine the first resistance encountered by the fluid between the first circulation pump and the first fluid insufflation port according to the first pressure drop; determine the second resistance encountered by the fluid between the second circulation pump and the second fluid insufflation port according to the second pressure drop; and determine the speed ratio according to the first resistance and the second resistance.

[0041] As an optional implementation, the detection value includes at least one of a temperature value, a flow value, a flow velocity value and a pressure value of the fluid.

[0042] As an optional implementation manner, the detection value includes a detection value obtained by detecting the fluid in the circulation pipeline, and / or a detection value obtained by detecting the fluid in the fluid infusion pipeline.

[0043] As an optional implementation, the first circulation pump, the first fluid replenishment port, the second circulation pump and the second fluid replenishment port are sequentially arranged in series on the circulation pipeline; the first fluid replenishment port is arranged at the inlet of the second circulation pump, and the second fluid replenishment port is arranged at the inlet of the first circulation pump.

[0044] In a third aspect, a readable storage medium is provided, on which a computer program is stored. When the computer program runs on a control device of a circulation pipeline, the control device of the circulation pipeline executes the control method of the circulation pipeline provided in the first aspect.

[0045] In a fourth aspect, a control device for a circulation pipeline is provided, comprising: a processor; a memory; and a computer program, wherein the computer program is stored in the memory, and when the computer program is executed by the processor, the screening device executes the control method for the circulation pipeline provided in the first aspect.

[0046] In a fifth aspect, a computer program product is provided, comprising: a computer program code, when the computer program code is run on a control device of a circulation pipeline, the control device of the circulation pipeline executes the control method of the circulation pipeline provided in the first aspect.

[0047] In a sixth aspect, a chip is provided, comprising: a processor for calling and running a computer program from a memory, so that a control device of a circulation pipeline equipped with the chip executes a control method of the circulation pipeline provided in the aforementioned first aspect.

[0048] It can be understood that the control device of the circulation pipeline provided in the second aspect, the readable storage medium provided in the third aspect, the computer program product provided in the fifth aspect, and the chip provided in the sixth aspect are all used to execute the control method of the circulation pipeline provided in the first aspect. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic structural diagram of a thermal management system for an electric vehicle provided in an embodiment of the present application is shown.

[0050] Figure 2 A schematic structural diagram of another thermal management system for an electric vehicle provided in an embodiment of the present application is shown.

[0051] Figure 3 A schematic structural diagram of a circulation pipeline provided in an embodiment of the present application is shown.

[0052] Figure 4 A schematic structural diagram of another circulation pipeline provided in an embodiment of the present application is shown.

[0053] Figure 5 A schematic structural diagram of another circulation pipeline provided in an embodiment of the present application is shown.

[0054] Figure 6A schematic diagram of the composition of a control system of a circulation pipeline provided in an embodiment of the present application is shown.

[0055] Figure 7 A flow chart of a method for controlling a circulation pipeline provided in an embodiment of the present application is shown.

[0056] Figure 8 A flow chart showing another method for controlling a circulation pipeline provided in an embodiment of the present application is shown.

[0057] Fig. 9 A schematic structural diagram of a control device for a circulation pipeline provided in an embodiment of the present application is shown.

[0058] Fig.10 A structural block diagram of a control device for a circulation pipeline provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0059] The technical solution in the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0060] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0061] The term "comprising" herein indicates the presence of the described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. The terms "comprising", "including", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized. Below, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0062] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0063] Thermal management systems are typically used to heat and / or cool one or more components in a device. During the heating or cooling process, a fluid (such as a coolant) circulates in a circulation pipeline (the circulation pipeline is also called a loop) to heat or cool the components arranged in the circulation pipeline.

[0064] Figure 1 FIG. 1 is a schematic diagram showing a thermal management system for an electric vehicle provided in an embodiment of the present application. Figure 1 As shown, the thermal management system includes a heating circuit 11, a cooling circuit 12 and a constant temperature circuit 13. The heating circuit 11 can be used to heat the passenger compartment of the electric vehicle; the cooling circuit 12 can be used to cool the motor drive system in the electric vehicle; the constant temperature circuit 13 can be used to heat or cool the power battery in the electric vehicle to maintain the temperature of the power battery stable.

[0065] like Figure 1 As shown, the circulation pump 111, the heating element 112, the heater core 113, and the connecting pipeline are sequentially connected in series to form a heating circuit 11. When the circulation pump 111 is in operation, the coolant in the heating circuit 11 can be driven to circulate in the heating circuit 11. During the circulation process, the coolant is heated in the heating element 112 and cooled in the heater core 113. The coolant dissipates heat and cools down in the heater core 113, and the passenger compartment is heated through the heater core 113.

[0066] The circulation pump 121, the motor drive system 122, the low-temperature radiator 123, and the connecting pipeline are sequentially connected in series to form a cooling circuit 12. When the circulation pump 121 is running, the coolant in the cooling circuit 12 can be driven to circulate in the cooling circuit 12. During the circulation process, the coolant is heated in the motor drive system 122 and cooled in the low-temperature radiator 123. The coolant absorbs the heat generated by the motor drive system 122 in the motor drive system 122, and cools the motor drive system 122.

[0067] The circulation pump 131, the heat exchange device 132, the thermostatic component 133, and the connecting pipeline are sequentially connected in series to form a thermostatic loop 13, and the thermostatic component 133 is installed in the power battery. When the circulation pump 131 is in operation, the coolant in the thermostatic loop 13 can be driven to circulate in the thermostatic loop 13. During the circulation process, the coolant is heated in the heat exchange device 132 and then cooled in the thermostatic component 133; or, the coolant is cooled in the heat exchange device 132 and then heated in the thermostatic component 133. The coolant can release heat to the power battery in the thermostatic component 133 to heat the power battery; the coolant can also absorb the heat generated by the power battery in the thermostatic component 133 to cool the power battery.

[0068] like Figure 1 As shown, the heating circuit 11 is provided with a refill port 114, which is connected to the expansion device 14 through a refill line 115. The expansion device 14 is also called an expansion kettle. When the coolant in the heating circuit 11 is insufficient, the expansion device 14 can replenish the coolant into the heating circuit 11 through the refill port 114. Similarly, the cooling circuit 12 and the constant temperature circuit 13 are respectively provided with a refill port 124 and a refill port 134, which are connected to the expansion device 14 through a refill line 125, and the refill port 134 is connected to the expansion device 14 through a refill line 135.

[0069] Figure 2 FIG. 2 shows a schematic diagram of the structure of another thermal management system for an electric vehicle provided in an embodiment of the present application. Figure 2 As shown, in some scenarios, the cooling circuit 12 and the constant temperature circuit 13 can be connected in series to form a circulation pipeline. In the circulation pipeline, after being heated by the motor drive system 122, the circulating coolant first enters the heat exchange device 132, and then enters the constant temperature component 133 to heat the power battery. The waste heat generated by the motor drive system 122 can be used to heat the power battery to achieve waste heat recovery, thereby reducing the power consumption of the thermal management system.

[0070] In this scenario, the circulation pump 121 and the circulation pump 131 are connected in series in the circulation pipeline, and the circulation pipeline also has the infusion port 124 and the infusion port 134. Since the resistance component between the circulation pump 121 and the infusion port 134 is generally different from the resistance component between the circulation pump 131 and the infusion port 124, the flow resistance between the circulation pump 131 and the infusion port 124 may be different from the flow resistance between the circulation pump 121 and the infusion port 134.

[0071] Among them, the resistance components, i.e., the components that generate resistance to the flow of the coolant, include the heat exchange device 132, the constant temperature component 133, the motor drive system 122, the low-temperature radiator 123, and the connecting pipes connecting the circulation pump 131 and the heat exchange device 132, the connecting pipes connecting the heat exchange device 132 and the constant temperature component 133, the connecting pipes connecting the constant temperature component 133 and the low-temperature radiator 123, the connecting pipes connecting the low-temperature radiator 123 and the fluid replenishment port 124, etc.

[0072] The difference in flow resistance may cause the pressure drop of the coolant between the circulation pump 131 and the fluid replenishment port 124 to be different from the pressure drop of the coolant between the circulation pump 121 and the fluid replenishment port 134, which may cause the first pressure of the coolant at the fluid replenishment port 124 to be different from the second pressure at the fluid replenishment port 134.

[0073] When the first pressure is greater than the second pressure, the coolant in the circulation pipeline will flow in the first direction X, and when the first pressure is less than the second pressure, the coolant in the circulation pipeline will flow in the second direction Y. The greater the pressure difference between the first pressure and the second pressure, the greater the cross-flow rate, which is the flow rate of the coolant that flows in the cross-flow, that is, the flow rate of the coolant in the replenishing pipeline 125 and the replenishing pipeline 135 when the cross-flow occurs.

[0074] When cross-flow occurs between the two fluid inlets, the cross-flow will reduce the circulation performance of the circulation pipeline and may cause the performance of the thermal management system to deteriorate. Figure 2 As shown, when crossflow in the first direction X occurs, the flow rate of the coolant entering the motor drive system 122 will decrease, which will deteriorate the cooling effect of the motor drive system 122. At the same time, part of the coolant in the expansion device 14 will enter the circulation pipeline through the liquid replenishing port 134, which will reduce the temperature of the coolant entering the heat exchange device 132 and the thermostatic component 133, thereby reducing the heating effect of the power battery.

[0075] An embodiment of the present application provides a control method for a circulation pipeline, comprising: detecting the state of the fluid in the pipeline to obtain a detection value, and controlling the rotational speed of a first circulation pump and a second circulation pump according to the detection value to prevent crossflow between a first fluid infusion port and a second fluid infusion port through an expansion device.

[0076] like Figure 2 As shown, the circulation pipeline may be a circulation pipeline formed by connecting the cooling circuit 12 and the constant temperature circuit 13 in series, the first circulation pump may be the circulation pump 121, the first fluid replenishment port may be the fluid replenishment port 134, the second circulation pump may be the circulation pump 131, and the second fluid replenishment port may be the fluid replenishment port 124. The state of the fluid in the circulation pipeline and / or the fluid replenishment pipeline may be detected to obtain a detection value, and the rotation speed of the circulation pump 121 and the circulation pump 131 may be controlled according to the detection value to prevent the fluid replenishment port 134 and the fluid replenishment port 124 from sending crossflow through the expansion device.

[0077] According to the control method provided in the embodiment of the present application, the rotational speeds of the first circulation pump and the second circulation pump on the circulation pipeline are controlled by using a detection value that can characterize the state of the fluid in the pipeline, thereby preventing possible crossflow between the first fluid infusion port and the second fluid infusion port, or improving or eliminating the crossflow between the first fluid infusion port and the second fluid infusion port when crossflow occurs.

[0078] When there is no crossflow between the two infusion ports or when the crossflow between the two infusion ports is improved, the circulation performance of the circulation pipeline can be guaranteed, thereby ensuring the performance of the thermal management system. At the same time, by controlling the circulation pump to prevent the crossflow between the first infusion port and the second infusion port, only a simple improvement can be made to the hardware structure of the thermal management system or no improvement can be made to the hardware structure of the thermal management system, thereby reducing the hardware cost of the thermal management system.

[0079] It should be noted that the control method provided in this embodiment is not only applicable to Figure 2 The circulation pipeline shown may also be applicable to other types of circulation pipelines.

[0080] See also Figure 3 , Figure 3 FIG. 1 shows a schematic diagram of a circulation pipeline provided in an embodiment of the present application. Figure 3 As shown, the circulation pipeline is connected in series with a first circulation pump 31, a first fluid infusion port 34, a second circulation pump 32, a second fluid infusion port 35 and a third circulation pump 33 in sequence, and the first fluid infusion port 34 and the second fluid infusion port 35 are respectively connected to the expansion device 14 through the fluid infusion pipeline.

[0081] See also Figure 4 , Figure 4 FIG. 2 shows a schematic diagram of another circulation pipeline provided in an embodiment of the present application. Figure 4 As shown, the circulation pipeline is provided with a first circulation pump 31, a second circulation pump 32 and a third circulation pump 33, and the first circulation pump 31 is connected in parallel with the second circulation pump 32. The first liquid infusion port 34, the first circulation pump 31 and the second circulation pump 32 connected in parallel, the second liquid infusion port 35 and the third circulation pump 33 are sequentially connected in series in the circulation pipeline, and the first liquid infusion port 34 and the second liquid infusion port 35 are respectively connected to the expansion device 14 through the liquid infusion pipeline.

[0082] See also Figure 5 , Figure 5 FIG. 2 shows a schematic diagram of another circulation pipeline provided in an embodiment of the present application. Figure 5 As shown, a first circulation pump 31 and a second circulation pump 32 are provided on the circulation pipeline, and the first circulation pump 31 and the second circulation pump 32 are connected in series. At the same time, the outlet of the first circulation pump 31 and the inlet of the second circulation pump 32 are connected through a branch 36 and a branch 37 connected in parallel, and different resistance components are respectively provided on each branch. The resistance components are, for example, connecting pipelines, and the heat exchange device and the thermostatic component in the above examples, but are not limited thereto.

[0083] exist Figure 2 , Figure 3 , Figure 4 and Figure 5In the circulation pipeline shown, the resistance component between the first circulation pump and the first fluid insufflation port is different from the resistance component between the second circulation pump and the second fluid insufflation port. Therefore, the pressure of the fluid at the first fluid insufflation port may be different from the pressure of the fluid at the second fluid insufflation port, which may cause crossflow between the first fluid insufflation port and the second fluid insufflation port through the expansion device.

[0084] The above are merely illustrative examples, and the relative positions of the first circulation pump, the first fluid insufflation port, the second circulation pump, and the second fluid insufflation port in the circulation pipeline may include but are not limited to the above examples.

[0085] Figure 6 The figure shows a schematic diagram of the control system of a circulation pipeline provided by an embodiment of the present application. Figure 6 As shown, the control system includes a control device 39 , one or more sensors 38 , a first circulation pump 31 , and a second circulation pump 32 .

[0086] The sensor 38 may be arranged on the circulation pipeline and / or the infusion pipeline, and may include a temperature sensor, a pressure sensor, a flow sensor, a flow rate sensor, etc., but is not limited thereto. The sensor 38 may detect the temperature, pressure, flow rate, and flow rate of the fluid in the circulation pipeline or the infusion pipeline to obtain detection values ​​such as temperature value, pressure value, flow rate value, and flow rate value.

[0087] The control device 39 may be composed of an interconnected controller and a driver, such as a vehicle control unit (VCU), a battery management system (BMS), and a drive motor controller in an electric vehicle, but not limited thereto. The controller is connected to the sensor 38, and a detection value can be obtained from the sensor 38. The driver is connected to the first circulation pump and the second circulation pump, and the controller can control the driver action according to the detection value, and control the speed of the first circulation pump and the second circulation pump through the driver.

[0088] The above are merely illustrative examples, and the specific composition of the control system of the circulation pipeline may include but is not limited to the above examples.

[0089] See attached Figure 7 , Figure 7 FIG. 1 is a flow chart of a control method 100 for a circulation pipeline provided in an embodiment of the present application. The execution subject of the control method 100 may be the aforementioned control device. Figure 7 As shown, the method may include step 110 and step 120 .

[0090] Step 110: The control device detects the state of the fluid in the pipeline to obtain a detection value.

[0091] Step 120: The control device controls the rotation speeds of the first circulation pump and the second circulation pump according to the detection value to prevent crossflow between the first fluid infusion port and the second fluid infusion port through the expansion device.

[0092] The pipeline includes a circulation pipeline and a fluid replenishment pipeline, a first circulation pump, a second circulation pump, a first fluid replenishment port, and a second fluid replenishment port are arranged in the circulation pipeline, and the first circulation pump and the second circulation pump are used to drive the fluid in the circulation pipeline to circulate in the circulation pipeline. The first fluid replenishment port and the second fluid replenishment port are respectively connected to the same expansion device through the fluid replenishment pipeline, and the expansion device can replenish the fluid to the circulation pipeline through the fluid replenishment pipeline when the fluid in the circulation pipeline is insufficient.

[0093] Exemplarily, the control device can detect the state of the fluid in the circulation pipeline to obtain the detection value. For example, a temperature sensor, a flow sensor, a pressure sensor, a flow rate sensor and other sensors can be set on the circulation pipeline, and the control device is connected to the sensor in communication. The sensor can detect the state of the fluid in the circulation pipeline, such as the temperature, flow rate, pressure and flow rate, and periodically send the detected temperature value, flow rate value, pressure value and flow rate value to the control device.

[0094] It should be understood that the pipeline may also be a fluid infusion pipeline, and the control device may detect the state of the fluid in the fluid infusion pipeline in the same manner as the circulation pipeline to obtain a detection value.

[0095] Alternatively, the fluid in the circulation pipeline and the infusion pipeline may be detected at the same time to obtain the above detection value. The detection of the fluid in the infusion pipeline may also be the detection of the fluid state in the expansion device.

[0096] Wherein, when the control device controls the rotation speeds of the first circulation pump and the second circulation pump according to the detection value, the control device may control the rotation speed of one of the circulation pumps to remain unchanged and adjust the rotation speed of the other circulation pump. For example, when the control device controls the rotation speeds of the first circulation pump and the second circulation pump according to the detection value, the control device may control the rotation speed of the first circulation pump to remain unchanged, and then increase or decrease the rotation speed of the second circulation pump to prevent crossflow between the first fluid infusion port and the second fluid infusion port through the expansion device.

[0097] Alternatively, when the control device controls the rotation speeds of the first circulation pump and the second circulation pump according to the detection value, the control device may also adjust the rotation speeds of the two circulation pumps at the same time. For example, the rotation speed of the first circulation pump may be increased and the rotation speed of the second circulation pump may be decreased, or the rotation speed of the first circulation pump may be decreased and the rotation speed of the second circulation pump may be increased, or the rotation speeds of the first circulation pump and the second circulation pump may be increased or decreased at the same time, so as to prevent cross-flow between the first fluid infusion port and the second fluid infusion port through the expansion device.

[0098] Or, the control device can also temporarily close one of the circulating pumps, for example, close the first circulating pump or the second circulating pump. And for the circulating pump that is not closed, its rotation speed can be increased or decreased.

[0099] Here, preventing crossflow between the first and second fluid infusion ports through the expansion device means that when crossflow does not occur between the first and second fluid infusion ports, after the rotation speeds of the first circulation pump and the second circulation pump are controlled according to the detection value, the probability of crossflow between the first and second fluid infusion ports can be reduced. Also, when crossflow occurs between the first and second fluid infusion ports, after the rotation speeds of the first and second circulation pumps are controlled according to the detection value, the crossflow between the first and second fluid infusion ports can be eliminated or improved. Elimination means that there is no crossflow between the first and second fluid infusion ports, and improvement means that the amount of crossflow between the first and second fluid infusion ports is reduced.

[0100] According to the control method 100 provided in the embodiment of the present application, a detection value that can characterize the state of the fluid in the pipeline is first obtained, and then the rotational speed of the first circulation pump and the second circulation pump is controlled according to the detection value to prevent crossflow between the first fluid infusion port and the second fluid infusion port through the expansion device. This can prevent possible crossflow between the first fluid infusion port and the second fluid infusion port, or improve or eliminate the crossflow phenomenon between the first fluid infusion port and the second fluid infusion port when crossflow occurs.

[0101] When there is no crossflow between the two infusion ports or when the crossflow between the two infusion ports is improved, the circulation performance of the circulation pipeline can be guaranteed, thereby ensuring the performance of the thermal management system. At the same time, by controlling the circulation pump to prevent the crossflow between the first infusion port and the second infusion port, only a simple improvement can be made to the hardware structure of the thermal management system or no improvement can be made to the hardware structure of the thermal management system, thereby reducing the hardware cost of the thermal management system.

[0102] In some embodiments, the first circulation pump, the first liquid infusion port, the second circulation pump and the second liquid infusion port are sequentially arranged in series on the circulation pipeline. Figure 2 , Figure 3 and Figure 5 As shown, in the circulation pipeline, the first circulation pump, the first fluid infusion port, the second circulation pump and the second fluid infusion port are connected in series in sequence, the first fluid infusion port is arranged between the outlet of the first circulation pump and the inlet of the second circulation pump, and the second fluid infusion port is arranged between the outlet of the second circulation pump and the inlet of the first circulation pump.

[0103] Among them, one or more resistance components are arranged between the first circulation pump and the first fluid infusion port, and between the second circulation pump and the second fluid infusion port. Of course, one or more resistance components can also be arranged between the second fluid infusion port and the first circulation pump, and between the first fluid infusion port and the second circulation pump.

[0104] In the embodiment of the present application, when the first circulation pump, the first fluid infusion port, the second circulation pump and the second fluid infusion port are arranged in series on the circulation pipeline, the structure of the circulation pipeline can be simplified, thereby simplifying the control logic of the first circulation pump and the second circulation pump, which is conducive to accurately preventing cross-flow between the first fluid infusion port and the second fluid infusion port.

[0105] In some embodiments, when the first circulation pump, the first fluid infusion port, the second circulation pump and the second fluid infusion port are arranged in series on the circulation pipeline, the control device can obtain a first pressure value of the fluid at the first fluid infusion port, and obtain a second pressure value of the fluid at the second fluid infusion port, and then control the rotational speeds of the first circulation pump and the second circulation pump according to the first pressure value and the second pressure value.

[0106] like Figure 2 As shown, a first pressure sensor may be provided at the fluid replenishment port 134 (first fluid replenishment port), and the control device may detect the pressure of the coolant at the fluid replenishment port 134 through the first pressure sensor to obtain a first pressure value. Similarly, a second pressure sensor may be provided at the fluid replenishment port 124 (second fluid replenishment port), and the control device may detect the pressure of the coolant at the fluid replenishment port 124 through the second pressure sensor to obtain a second pressure value.

[0107] The first circulation pump corresponds to the first liquid replenishment port, and the pressure of the coolant at the first liquid replenishment port is mainly determined by the rotation speed of the first circulation pump and the resistance component between the first circulation pump and the first liquid replenishment port. Similarly, the pressure of the coolant at the second liquid replenishment port is mainly determined by the rotation speed of the second circulation pump and the resistance component between the second circulation pump and the second liquid replenishment port.

[0108] When the detection value includes the first pressure value and the second pressure value, the rotation speed ratio of the first circulation pump and the second circulation pump is as follows:

[0109]

[0110] Wherein, N1 is the rotation speed of the first circulation pump, N2 is the rotation speed of the second circulation pump, Z1 is the first pressure value, and Z2 is the second pressure value. That is, the speed ratio between the first circulation pump and the second circulation pump. From formula (1), it can be seen that the speed ratio between the first circulation pump and the second circulation pump is and Positive correlation, The larger the speed, the The larger the speed, or in some embodiments, the Can be equal to

[0111] Exemplarily, during the process of controlling the first circulation pump and the second circulation pump, if the speed of one of the circulation pumps is known, the control device can determine the speed of the other circulation pump according to the known speed of the circulation pump and formula (1). For example, if the speed N1 of the first circulation pump is known, the control device can substitute the speed N1 of the first circulation pump, the first pressure value X1 and the second pressure value X2 into formula (1), determine the speed N2 of the second circulation pump according to formula (1), and then control the speed of the first circulation pump to remain unchanged, and control the speed of the second circulation pump to be N2, so that the speed ratio of the first circulation pump to the second circulation pump is equal Or make the speed ratio and Positive correlation.

[0112] For example, in the control process, when the speeds of the first circulating pump and the second circulating pump are both unknown, the speeds of the first circulating pump and the second circulating pump can be directly set so that the speed ratio of the first circulating pump to the second circulating pump is equal Or you can also make the speed ratio and Positive correlation.

[0113] In practical applications, the rotation speeds of the first circulation pump and the second circulation pump can also be controlled according to the flow value of the fluid at the first infusion port and the flow value of the fluid at the second infusion port, or the rotation speeds of the first circulation pump and the second circulation pump can be controlled according to the flow velocity value of the fluid at the first infusion port and the flow velocity value of the fluid at the second infusion port. The method of controlling the rotation speeds of the first circulation pump and the second circulation pump according to the flow value and the method of controlling the rotation speeds of the first circulation pump and the second circulation pump according to the flow velocity value are similar to the method of controlling the rotation speeds of the first circulation pump and the second circulation pump according to the pressure value, and are not described in detail in this embodiment.

[0114] See attached Figure 8 , Figure 8 FIG. 2 is a flow chart of a control method 200 for a cooling system provided in an embodiment of the present application. The control method 200 may be executed by the control device 39 described above. Figure 8 As shown, the control method 200 includes step 210 , step 220 and step 230 .

[0115] In step 210, the control device detects the state of the fluid in the pipeline to obtain a detection value.

[0116] In step 220 , the control device determines a first pressure drop and a second pressure drop according to the detection value.

[0117] In step 230 , the control device controls the rotation speeds of the first circulation pump and the second circulation pump according to the first pressure drop and the second pressure drop to prevent crossflow between the first fluid infusion port and the second fluid infusion port through the expansion device.

[0118] The first pressure drop is the pressure drop between the outlet of the first circulation pump and the first fluid infusion port, and the first pressure drop is positively correlated with the first resistance encountered by the fluid between the outlet of the first circulation pump and the first fluid infusion port. The greater the first resistance, the greater the first pressure drop. The second pressure drop is the pressure drop between the outlet of the second circulation pump and the second fluid infusion port, and the second pressure drop is positively correlated with the second resistance encountered by the fluid between the outlet of the second circulation pump and the second fluid infusion port. The greater the second resistance, the greater the second pressure drop.

[0119] When the first circulation pump, the first fluid infusion port, the second circulation pump and the second fluid infusion port are arranged in series on the circulation pipeline, the control device can first determine the first pressure drop and the second pressure drop according to the acquired detection values, and then control the rotation speeds of the first circulation pump and the second circulation pump according to the first pressure drop and the second pressure drop to prevent crossflow between the first fluid infusion port and the second fluid infusion port through the expansion device.

[0120] Exemplarily, the detected values ​​may include a first pressure value of the fluid at the first fluid insufflation port, a third pressure value at the outlet of the first circulation pump, a second pressure value at the second fluid insufflation port, and a fourth pressure value at the outlet of the second circulation pump.

[0121] like Figure 2 As shown, while detecting and acquiring the first pressure value and the second pressure value, a third pressure sensor may be provided at the outlet of the circulation pump 121, and the third pressure value at the outlet of the circulation pump 121 may be detected by the third pressure sensor. At the same time, a fourth pressure sensor may be provided at the outlet of the circulation pump 131, and the fourth pressure value at the outlet of the circulation pump 131 may be detected by the fourth pressure sensor.

[0122] The control device can calculate the difference between the third pressure value and the first pressure value at the first fluid infusion port to obtain a first pressure drop of the coolant between the outlet of the first circulation pump and the first fluid infusion port. Similarly, the difference between the fourth pressure value and the second pressure value can be calculated to obtain a second pressure drop of the coolant between the outlet of the second circulation pump and the second fluid infusion port. Then, the control device can control the rotation speeds of the first circulation pump and the second circulation pump according to the first pressure drop and the second pressure drop to prevent crossflow between the first fluid infusion port and the second fluid infusion port through the expansion device.

[0123] In practical applications, the pressure drop between the circulation pump and the infusion port can accurately characterize the resistance encountered by the fluid between the circulation pump and the corresponding infusion port. Therefore, when the rotation speeds of the first circulation pump and the second circulation pump are controlled according to the pressure drop between the circulation pump and the infusion port, the pressure difference between the first infusion port and the second infusion port can be reduced, thereby improving or eliminating the crossflow phenomenon between the first infusion port and the second infusion port through the expansion device.

[0124] Optionally, step 230 may include:

[0125] determining a speed ratio between the first circulation pump and the second circulation pump according to the first pressure drop and the second pressure drop;

[0126] The rotational speeds of the first circulation pump and the second circulation pump are controlled according to the rotational speed ratio.

[0127] Among them, the speed ratio is used to control the speed of the first circulation pump and the speed of the second circulation pump to reach a certain proportional relationship, so as to eliminate or reduce the pressure difference between the first fluid infusion port and the second fluid infusion port, so as to prevent crossflow between the first fluid infusion port and the second fluid infusion port.

[0128] Exemplarily, the control device can determine the speed ratio between the first circulation pump and the second circulation pump according to the ratio of the first pressure drop to the second pressure drop, and then control the speeds of the first circulation pump and the second circulation pump according to the speeds. The relationship between the speed ratio between the first circulation pump and the second circulation pump and the first pressure drop and the second pressure drop is as follows:

[0129]

[0130] Among them, ΔP1 is the first pressure drop, and ΔP2 is the second pressure drop. From formula (2), it can be seen that the speed ratio of the first circulation pump to the second circulation pump is and Positive correlation, The larger the speed, the In some embodiments, the speed ratio It can also be equal to

[0131] When the speed of one of the first circulating pump and the second circulating pump is known, the control device can substitute the speed of the circulating pump, the first pressure drop ΔP1 and the second pressure drop ΔP2 into formula (2), and determine the speed of the other circulating pump by formula (2). Then, the speed of the circulating pump with known speed can be kept unchanged, and the other circulating pump can be controlled to rotate by the determined speed, so that the speed ratio between the first circulating pump and the second circulating pump is equal to Or you can also make the speed ratio and Positive correlation.

[0132] When the speed of the first circulation pump and the speed of the second circulation pump are both unknown, the speed of the first circulation pump and the speed of the second circulation pump can be set according to formula (2) so that the speed ratio between the first circulation pump and the second circulation pump is equal to Or you can also make the speed ratio and Positive correlation.

[0133] Among them, when the first circulation pump, the first liquid replenishment port, the second circulation pump and the second liquid replenishment port are sequentially arranged in series on the circulation pipeline, the greater the flow resistance between the circulation pump and the corresponding liquid replenishment port, the greater the pressure drop of the coolant between the outlet of the circulation pump and the corresponding liquid replenishment port. When the first circulation pump and the second circulation pump are controlled by formula (2), the greater the pressure drop between the circulation pump and the corresponding liquid replenishment port, the greater the speed of the circulation pump, the pressure at the outlet of the circulation pump can be increased, thereby increasing the pressure at the corresponding liquid replenishment port, and further reducing or even eliminating the pressure difference between the first liquid replenishment port and the second liquid replenishment port, so as to prevent crossflow between the first liquid replenishment port and the second liquid replenishment port.

[0134] In the embodiment of the present application, the speed ratio is determined according to the first pressure drop and the second pressure drop, and the speeds of the first circulation pump and the second circulation pump are controlled according to the speed ratio. The speed of the first circulation pump can be matched with the resistance encountered by the fluid between the first circulation pump and the first fluid infusion port, and the speed of the second circulation pump can be matched with the resistance encountered by the fluid between the second circulation pump and the second fluid infusion port. This can reduce or eliminate the pressure difference between the first fluid infusion port and the second fluid infusion port, thereby preventing crossflow between the first fluid infusion port and the second fluid infusion port.

[0135] Optionally, the step of determining the speed ratio between the first circulation pump and the second circulation pump based on the first pressure drop and the second pressure drop may include: determining a first resistance encountered by the fluid between the first circulation pump and the first fluid insufflation port based on the first pressure drop, determining a second resistance encountered by the fluid between the second circulation pump and the second fluid insufflation port based on the second pressure drop, and then determining the speed ratio between the first circulation pump and the second circulation pump based on the first resistance and the second resistance.

[0136] The first resistance is the resistance encountered by the fluid between the outlet of the first circulation pump and the first fluid infusion port, that is, the pressure loss of the fluid in the process of flowing from the outlet of the first circulation pump to the first fluid infusion port. The second resistance is the resistance encountered by the fluid between the outlet of the second circulation pump and the second fluid infusion port, that is, the pressure loss of the fluid in the process of flowing from the outlet of the second circulation pump to the second fluid infusion port.

[0137] The control device can first determine the first resistance according to the first pressure drop, determine the second resistance according to the second pressure drop, and then determine the speed ratio of the first circulation pump and the second circulation pump according to the first resistance and the second resistance, and then control the speed of the first circulation pump and the second circulation pump according to the speed ratio of the first circulation pump and the second circulation pump.

[0138] For example, if there are two resistance components between the first circulation pump and the first fluid infusion port, the pressure drop of the fluid on one of the resistance components is ΔP x , the pressure drop on the other resistance component is ΔP y , then the first resistance of the fluid between the first circulation pump and the first fluid infusion port can be calculated and determined by formula (3), which is as follows:

[0139]

[0140] Wherein, R1 is the first resistance of the fluid between the first circulation pump and the first fluid infusion port, (ΔP x +ΔP y ) is the first pressure drop, q is the flow value of the fluid between the first circulation pump and the first liquid replenishing port, and the flow value may be the average flow value of the fluid between the first circulation pump and the first liquid replenishing port. Similarly, the second resistance R2 of the coolant between the second circulation pump and the second liquid replenishing port may be determined by the same method.

[0141] In practical applications, the resistance of the fluid on each resistance component can also be determined separately, and then the resistance of the fluid on each resistance component between the first circulation pump and the first fluid infusion port can be summed to obtain the first resistance. Similarly, the resistance of the fluid on each resistance component between the second circulation pump and the second fluid infusion port can be summed to obtain the second resistance.

[0142] When determining the resistance of the fluid between the outlet of the circulation pump and the liquid infusion port, the resistance of the fluid between the outlet of the circulation pump and the liquid infusion port can be determined in combination with the structure of the circulation pipeline. Figure 5 As shown, a branch 36 and a branch 37 are connected in parallel between the first circulation pump 31 and the first liquid replenishing port 34. The first resistance R1 can be calculated and determined by formula (4), which is as follows:

[0143]

[0144] Wherein, R3 is the resistance of the fluid on the branch 36 , and R4 is the resistance of the fluid on the branch 37 .

[0145] The above are merely illustrative examples, and methods for determining the first resistance and the second resistance may include but are not limited to the above examples.

[0146] Exemplarily, the relationship between the first resistance R1, the second resistance R2, the rotation speed N1 of the first circulation pump, and the rotation speed N2 of the second circulation pump may be as follows:

[0147]

[0148] Among them, K1 and K2 in formula (5) are pre-determined coefficients, and K3 is a pre-determined constant term.

[0149] In practical applications, multiple sets of parameters can be obtained in advance when there is no crossflow or the crossflow amount is close to 0 between the first and second fluid infusion ports, and each set of parameters includes the rotation speed of the first circulation pump, the rotation speed of the second circulation pump, and the first resistance and the second resistance. Then, curve fitting can be performed on the multiple sets of parameters to determine the relationship curve between the rotation speed of the first circulation pump, the rotation speed of the second circulation pump, and the first resistance and the second resistance, so that the coefficient K1, coefficient K2 and constant term K3 in the relationship curve can be determined. The method for obtaining the coefficient K1, coefficient K2 and constant term K3 may include but is not limited to the above examples.

[0150] Table 1

[0151]

[0152] As shown in Table 1, in Example 1, when the speed of the first circulation pump is known to be 2500 revolutions per minute (rpm), the first resistance is 0.485, and the second resistance is 0.254, the speed of the second circulation pump can be determined to be 1900 rpm by formula (5).

[0153] Similarly, in Example 2, when the rotation speed of the first circulation pump is known to be 4000 rpm, the first resistance is 0.165, and the second resistance is 0.384, the rotation speed of the second circulation pump can be determined to be 5800 rpm by formula (5).

[0154] It should be noted that, in the process of determining the speed ratio between the first circulation pump and the second circulation pump according to the first resistance and the second resistance, formula (5) may include only one term: Or include only the quadratic term Or include only one item and the quadratic term

[0155] Optionally, step 220 may include:

[0156] Determine the pressure drop of the fluid on the resistance component according to the detected value;

[0157] The first pressure drop and the second pressure drop are determined according to the pressure drop of the fluid on the resistance component.

[0158] The pressure drop of the fluid on the resistance component is the pressure loss of the fluid after flowing through the resistance component.

[0159] In some embodiments, the pressure drop of the fluid on the resistance component can be determined based on the pressure of the fluid at the inlet of the resistance component and the pressure of the fluid at the outlet of the resistance component. For example, the detection value may include the pressure value of the fluid at the inlet and the pressure value at the outlet of each resistance component, and the difference between the pressure value at the inlet and the pressure value at the outlet of the resistance component can be calculated to obtain the pressure drop of the fluid on the resistance component.

[0160] like Figure 2 As shown, for the motor drive system 122, the pressure value of the coolant at the inlet of the motor drive system 122 can be obtained, and the pressure value of the coolant at the outlet of the motor drive system 122 can be obtained, and then the difference between the pressure value at the inlet and the pressure value at the outlet is calculated to obtain the pressure drop of the coolant on the motor drive system 122.

[0161] By analogy, for the first pressure drop, the control device can determine the pressure drop of the fluid on each resistance component between the outlet of the first circulation pump and the first fluid infusion port, and then sum the pressure drops of the fluid on all resistance components between the first circulation pump and the first fluid infusion port to obtain the first pressure drop of the fluid between the outlet of the first circulation pump and the first fluid infusion port. Similarly, the second pressure drop of the fluid between the outlet of the second circulation pump and the second fluid infusion port can be determined.

[0162] Optionally, the step of determining the first pressure drop and the second pressure drop may include:

[0163] Determining a predicted pressure drop corresponding to the detected value from a pressure drop mapping table of the resistance component;

[0164] The pressure drop of the fluid across the resistance component is determined based on the predicted pressure drop.

[0165] The pressure drop mapping table may store different pre-measured detection values ​​of the fluid in the resistance component and the predicted pressure drops of the fluid on the resistance component corresponding to the different detection values. The pressure drop mapping table may be measured experimentally in advance and stored in the control device. The control device may determine the pressure drop of the fluid on the resistance component according to the obtained detection value and the corresponding predicted pressure drop recorded in the pressure drop mapping table.

[0166] Exemplarily, the detection value may include a temperature value and a flow value of the fluid in the resistance component. Correspondingly, the pressure drop mapping table includes a plurality of pre-measured temperature values ​​of the fluid in the resistance component, a plurality of flow values ​​corresponding to each temperature value, and a predicted pressure drop corresponding to the temperature value and each flow value.

[0167] Table 2

[0168]

[0169] As shown in Table 2, Table 2 is a pressure drop mapping table of one of the resistance components, and the pressure drop mapping table includes multiple temperature values ​​of the fluid, multiple flow values ​​corresponding to each temperature value, and a predicted pressure drop corresponding to each flow value. For example, if the temperature value of the fluid in the resistance component obtained by the control device is T2 and the flow rate is q5, it can be determined that the pressure drop of the fluid on the resistance component is the predicted pressure drop p5.

[0170] After the control device obtains the temperature value and pressure value of the fluid in a resistance component, if the temperature value and / or flow value are not included in the pressure drop mapping table, the pressure drop of the fluid on the resistance component can be determined by interpolation according to the pressure drop mapping table. For example, if the temperature value obtained by the control device is T2 and the flow value is X, and the flow value X is greater than q5 and less than q6, it can be determined that the pressure drop of the fluid on the resistance component is (p5+p6) / 2.

[0171] By analogy, for each resistance component, after obtaining the temperature value and flow value of the fluid in the resistance component, the control device can determine the pressure drop of the fluid on the resistance component according to the temperature value and flow value through the pressure drop mapping table.

[0172] It should be noted that the detection values ​​recorded in the pressure drop mapping table may also be other detection values ​​besides the temperature value and the flow value.

[0173] In the embodiment of the present application, the pressure drop of the fluid on the resistance component is determined based on the detection value of the fluid and the pressure drop mapping table, so that a more accurate pressure drop of the fluid on the resistance component can be determined, thereby determining a more accurate first pressure drop and a second pressure drop, and more accurately controlling the first circulation pump and the second circulation pump, thereby improving the control effect and better preventing crossflow between the first circulation pump and the second circulation pump.

[0174] In some embodiments, the detection value may include a detection value obtained by measuring the fluid in the infusion pipeline. For example, the detection value may include a flow value and a flow direction of the fluid in the infusion pipeline.

[0175] like Figure 2 As shown, a flow sensor may be provided in the liquid replenishing pipeline 125, and the flow sensor may periodically send to the control device the flow value and flow direction of the coolant in the liquid replenishing pipeline 125. When the control device detects that the flow value in the liquid replenishing pipeline 125 is greater than 0 and the flow direction is the first direction X, it may determine that the pressure of the coolant at the liquid replenishing port 124 is greater than the pressure at the liquid replenishing port 134.

[0176] At this time, the control device can increase the speed of the circulation pump 121 according to the flow value of the coolant in the liquid replenishing pipeline 125, and the increase in the speed of the circulation pump 121 is positively correlated with the flow value of the coolant in the liquid replenishing pipeline 125. When the speed of the circulation pump 121 increases, the pressure value of the coolant at the liquid replenishing port 134 can be increased, and then the pressure difference between the liquid replenishing port 124 and the liquid replenishing port 134 can be reduced, so as to eliminate or improve the crossflow phenomenon between the liquid replenishing port 124 and the liquid replenishing port 134.

[0177] Alternatively, the control device may also reduce the speed of the circulation pump 131. When the speed of the circulation pump 131 is reduced, the pressure value of the coolant at the liquid replenishing port 124 may be reduced to reduce the pressure difference between the liquid replenishing port 124 and the liquid replenishing port 134. Alternatively, the speed of the circulation pump 131 may be increased while the speed of the circulation pump 121 is reduced to reduce the pressure difference between the liquid replenishing port 124 and the liquid replenishing port 134.

[0178] The above are merely illustrative examples, and the specific method of controlling the first circulation pump and the second circulation pump according to the detection value in the infusion pipeline may include but is not limited to the above examples.

[0179] In some embodiments, the detection value may include the detection value obtained by measuring the fluid in the infusion pipeline and the detection value detected by the fluid in the circulation pipeline. For example, the detection value may include the first pressure value, the second pressure value and the flow value in the infusion pipeline in the aforementioned example, and the control device may first determine the speed increase according to the flow value in the infusion pipeline. Then, the first pressure value and the second pressure value are compared to determine the flow direction of the fluid in the infusion pipeline, and it is determined whether the speed of the first circulation pump or the speed of the second circulation pump needs to be increased according to the flow direction. Finally, the speed of the first circulation pump or the second circulation pump is increased according to the speed increase.

[0180] In an embodiment of the present application, when the detection value includes the detection value of the fluid in the circulation pipeline and / or the detection value of the fluid in the infusion pipeline, it is convenient to detect the fluid in the circulation pipeline and obtain the detection value according to actual needs, and / or to detect the fluid in the infusion pipeline and obtain the detection value.

[0181] In some embodiments, the first liquid inlet is disposed at the inlet of the second circulation pump, and the second liquid inlet is disposed at the inlet of the first circulation pump. Figure 2 As shown, the inlet 124 can be arranged at the inlet of the circulation pump 121, that is, no other resistance components except the connecting pipeline are arranged between the inlet 124 and the circulation pump 121. Similarly, the inlet 134 can be arranged at the inlet of the circulation pump 131, and no other resistance components except the connecting pipeline are arranged between the inlet 134 and the circulation pump 131.

[0182] In an embodiment of the present application, when the first fluid infusion port is arranged at the inlet of the second circulation pump and the second fluid infusion port is arranged at the inlet of the first circulation pump, it is convenient to determine the position of the fluid infusion port in the circulation pipeline, thereby facilitating detection and obtaining of detection values, as well as facilitating determination of data such as resistance components and pressure drop between the circulation pump and the corresponding fluid infusion port.

[0183] Wherein, other circulating pumps besides the first circulating pump and the second circulating pump may be arranged on the circulating pipeline. When other circulating pumps besides the first circulating pump and the second circulating pump are arranged on the circulating pipeline, the first circulating pump or the second circulating pump corresponding to the other circulating pump may be determined, and the corresponding Figure 7 and Figure 8 The method shown controls other circulation pumps.

[0184] It should be noted that, in the control process of the circulation pipeline, not only the rotation speeds of the first circulation pump and the second circulation pump can be controlled, but also the rotation speeds of other circulation pumps except the first circulation pump and the second circulation pump can be controlled. Figure 4 As shown, during the control process of the circulation pipeline, not only the rotational speeds of the first circulation pump 31 and the second circulation pump 32 can be controlled according to the acquired detection values, but also the rotational speed of the third circulation pump 33 can be controlled according to the detection values ​​to prevent cross-flow between the first fluid infusion port 34 and the second fluid infusion port 35.

[0185] Combination of the above Figures 1 to 8 The control method of the circulation pipeline provided in the embodiment of the present application is described in detail. Fig. 9 , Fig.10 The control device of the circulation pipeline provided in the embodiment of the present application is described. It should be understood that Fig. 9 , Fig.10 The control device shown can achieve Figure 7 or Figure 8 One or more steps in the method flow shown are not described in detail here to avoid repetition.

[0186] Fig. 9 FIG. 1 is a schematic diagram showing a control device for a circulation pipeline provided in an embodiment of the present application. Fig. 9 As shown, the detection device 90 includes a detection module 91 and a control module 92 .

[0187] A detection module 91, used to detect the state of the fluid in the pipeline to obtain a detection value;

[0188] The control module 92 is used to control the rotation speeds of the first circulation pump and the second circulation pump according to the detection value to prevent crossflow between the first liquid infusion port and the second liquid infusion port through the expansion device.

[0189] As an optional implementation, the control module 92 is specifically used to determine a first pressure drop and a second pressure drop based on the detection value, the first pressure drop being the pressure drop between the outlet of the first circulation pump and the first fluid infusion port, and the second pressure drop being the pressure drop between the outlet of the second circulation pump and the second fluid infusion port; the speeds of the first circulation pump and the second circulation pump are controlled according to the first pressure drop and the second pressure drop.

[0190] As an optional implementation, the control module 92 is specifically used to determine the speed ratio between the first circulation pump and the second circulation pump according to the first pressure drop and the second pressure drop; and control the speeds of the first circulation pump and the second circulation pump according to the speed ratio.

[0191] As an optional implementation, the control module 92 is specifically configured to determine the pressure drop of the fluid on the resistance component according to the detection value; and determine the first pressure drop and the second pressure drop according to the pressure drop of the fluid on the resistance component.

[0192] As an optional implementation, the control module 92 is specifically configured to determine a predicted pressure drop corresponding to the detection value from a pressure drop mapping table of the resistance component; and determine the pressure drop of the fluid on the resistance component according to the predicted pressure drop.

[0193] As an optional implementation, the control module 92 is specifically used to determine the first resistance encountered by the fluid between the first circulation pump and the first fluid infusion port according to the first pressure drop; determine the second resistance encountered by the fluid between the second circulation pump and the second fluid infusion port according to the second pressure drop; and determine the speed ratio according to the first resistance and the second resistance.

[0194] As an optional implementation, the detection value includes at least one of a temperature value, a flow value, a flow velocity value and a pressure value of the fluid.

[0195] As an optional implementation, the detection value includes a detection value obtained by detecting the fluid in the circulation pipeline and / or a detection value obtained by detecting the fluid in the fluid infusion pipeline.

[0196] As an optional implementation, the first circulation pump, the first fluid infusion port, the second circulation pump and the second fluid infusion port are arranged in series on the circulation pipeline; the first fluid infusion port is arranged at the inlet of the second circulation pump, and the second fluid infusion port is arranged at the inlet of the first circulation pump.

[0197] Fig.10 FIG. 1 shows a structural block diagram of a control device for a circulation pipeline provided in an embodiment of the present application. Fig.10 As shown, the control device 10 of the circulation pipeline includes a processor 101 and a memory 102 , and the above-mentioned various devices can be connected via one or more buses 104 .

[0198] The control device 10 of the circulation pipeline further includes a computer program 103, which is stored in the memory 102. When the computer program 103 is executed by the processor 101, the control device 10 of the circulation pipeline executes the above Figure 7 and Figure 8 All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding physical device, and will not be repeated here.

[0199] An embodiment of the present application also provides a readable storage medium, which includes a computer program. When the computer program is executed on a computer, the computer executes the method provided by the above method embodiment.

[0200] An embodiment of the present application also provides a computer program product comprising instructions, and when the computer program product is run on a computer, the computer is enabled to execute the method provided by the above method embodiment.

[0201] An embodiment of the present application also provides a chip system, including a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a control device of a circulation pipeline equipped with the chip system executes the method provided in the above method embodiment.

[0202] Among them, the chip system may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0203] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0204] It should also be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0205] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0206] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0207] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0208] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0209] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0210] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0211] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for controlling a circulation pipeline, characterized in that: The circulation pipeline is provided with a first circulation pump, a second circulation pump, a first fluid infusion port and a second fluid infusion port, the first fluid infusion port and the second fluid infusion port are connected to the expansion device through the fluid infusion pipeline, and the control method includes: Detecting the state of the fluid in the pipeline to obtain a detection value; The rotation speeds of the first circulation pump and the second circulation pump are controlled according to the detection value to prevent crossflow between the first fluid inlet and the second fluid inlet through the expansion device.

2. The control method according to claim 1, characterized in that: The controlling the first circulation pump and the second circulation pump according to the detection value comprises: Determine a first pressure drop and a second pressure drop according to the detection value, wherein the first pressure drop is the pressure drop between the outlet of the first circulation pump and the first liquid replenishing port, and the second pressure drop is the pressure drop between the outlet of the second circulation pump and the second liquid replenishing port; The rotation speeds of the first circulation pump and the second circulation pump are controlled according to the first pressure drop and the second pressure drop.

3. The control method according to claim 2, characterized in that: The controlling the rotation speeds of the first circulation pump and the second circulation pump according to the first pressure drop and the second pressure drop comprises: determining a speed ratio between the first circulation pump and the second circulation pump according to the first pressure drop and the second pressure drop; The rotational speeds of the first circulation pump and the second circulation pump are controlled according to the rotational speed ratio.

4. The control method according to claim 2 or 3, characterized in that: At least one resistance component is provided between the first circulation pump and the first fluid infusion port, and between the second circulation pump and the second fluid infusion port, and the determining of the first pressure drop and the second pressure drop according to the detection value includes: determining the pressure drop of the fluid on the resistance component according to the detection value; The first pressure drop and the second pressure drop are determined according to the pressure drop of the fluid on the resistance component.

5. The control method according to claim 4, characterized in that: Determining the pressure drop of the fluid on the resistance component according to the detection value includes: determining a predicted pressure drop corresponding to the detected value from a pressure drop mapping table of the resistance component; The pressure drop of the fluid on the resistance component is determined based on the predicted pressure drop.

6. The control method according to claim 3, characterized in that: The step of determining the speed ratio between the first circulation pump and the second circulation pump according to the first pressure drop and the second pressure drop includes: determining a first resistance encountered by the fluid between the first circulation pump and the first fluid replenishment port according to the first pressure drop; determining a second resistance encountered by the fluid between the second circulation pump and the second fluid replenishment port according to the second pressure drop; The speed ratio is determined according to the first resistance and the second resistance.

7. The control method according to any one of claims 1 to 6, characterized in that: The detection value includes at least one of a temperature value, a flow value, a flow velocity value and a pressure value of the fluid.

8. The control method according to any one of claims 1 to 7, characterized in that: The detection value includes a detection value obtained by detecting the fluid in the circulation pipeline and / or a detection value obtained by detecting the fluid in the fluid infusion pipeline.

9. The control method according to any one of claims 1 to 8, characterized in that: The first circulation pump, the first fluid replenishment port, the second circulation pump and the second fluid replenishment port are sequentially arranged in series on the circulation pipeline; the first fluid replenishment port is arranged at the inlet of the second circulation pump, and the second fluid replenishment port is arranged at the inlet of the first circulation pump.

10. A control device for a circulation pipeline, characterized in that: The circulation pipeline is provided with a first circulation pump, a second circulation pump, a first fluid infusion port and a second fluid infusion port, the first fluid infusion port and the second fluid infusion port are connected to the expansion device through the fluid infusion pipeline, and the control device includes: A detection module, used to detect the state of the fluid in the pipeline to obtain a detection value; A control module is used to control the rotation speeds of the first circulation pump and the second circulation pump according to the detection value to prevent crossflow between the first fluid infusion port and the second fluid infusion port through the expansion device.

11. A readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program runs on a control device of a circulation pipeline, the control device of the circulation pipeline executes the method according to any one of claims 1 to 9.

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