Liquid cooling control system and method for automotive domain controller and vehicle

Abstract

The application discloses a liquid cooling control system and method of an automobile domain controller and a vehicle, and relates to the technical field of vehicles, which can control the supply flow of cooling medium and avoid damage of the automobile domain controller caused by condensate water. The system comprises: a plurality of automobile domain controllers comprising heat dissipation cavities; a cooling medium supply device connected with the automobile domain controllers and used for providing cooling medium to the inlets of the heat dissipation cavities of the automobile domain controllers; a plurality of regulating valves, one regulating valve being connected with one automobile domain controller and also connected with the cooling medium supply device; and a plurality of flow controllers, one flow controller being connected with one regulating valve and also connected with one automobile domain controller, used for determining a first flow according to the current power and the heat dissipation coefficient of the automobile domain controller, determining a second flow of the cooling medium required for absorbing the heat corresponding to the current power and not generating condensate water, and controlling the regulating valve to be opened at a corresponding target opening degree according to the minimum flow of the first flow and the second flow.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a liquid cooling control system and method for an automotive domain controller and a vehicle. BACKGROUND

[0002] With the development of electrification, networking and intelligence of vehicles, the integration of automotive domain controllers is becoming higher and higher, which makes the power consumption of the chips of the automotive domain controllers also higher and higher, and further leads to the increasing heat generation of the chips of the automotive domain controllers. At present, the liquid cooling method is usually used to dissipate heat for the automotive domain controller. Specifically, the cooling medium (such as water, ethylene glycol, etc.) can be provided to the automotive domain controller through the liquid cooling loop (such as the air conditioning loop, the battery liquid cooling loop, etc.) inside the vehicle to absorb the heat of the automotive domain controller.

[0003] In order to reduce the volume and cost, one liquid cooling loop usually includes a compressor, an evaporator, a motor and other automotive domain controllers that need to dissipate heat. The compressor, motor and other automotive domain controllers will absorb heat, which will cause the temperature of the cooling medium to be lower than the ambient temperature. If the temperature of the cooling medium is lower than the ambient temperature for a long time, the pipes of the liquid cooling loop will absorb water vapor in the air, which will cause condensation water on the surface of the automotive domain controller. If the condensation water on the surface of the automotive domain controller drips onto the circuit board inside the automotive domain controller, the automotive domain controller will be damaged. SUMMARY

[0004] The present application provides a liquid cooling control system and method for an automotive domain controller and a vehicle, which can control the supply flow of the cooling medium to prevent the generation of condensation water on the surface of the automotive domain controller and avoid damage to the automotive domain controller.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a liquid cooling control system for an automotive domain controller, which comprises:

[0007] a plurality of automotive domain controllers, each automotive domain controller comprising a heat dissipation cavity having an inlet and an outlet;

[0008] a cooling medium supply device connected to the automotive domain controllers and configured to provide cooling medium to the inlet of the heat dissipation cavity of the automotive domain controllers;

[0009] a plurality of regulating valves, each regulating valve being connected to one automotive domain controller and further connected to the cooling medium supply device;

[0010] The plurality of flow controllers are connected with the plurality of regulating valves and the plurality of automobile domain controllers, and are configured to determine a first flow according to a current power of the automobile domain controller and a heat dissipation coefficient of the automobile domain controller, the heat dissipation coefficient being used to represent a heat dissipation capability of the automobile domain controller, and determine a second flow, the second flow being a flow of the cooling medium required for absorbing heat corresponding to the current power and not generating condensed water, and determine a target opening of the regulating valve according to a target flow, the target flow being a minimum flow of the first flow and the second flow, and control the regulating valve to open according to the target opening.

[0011] The liquid cooling control system of the automobile domain controller provided by the application determines a first flow of the cooling medium required for absorbing heat corresponding to the current power and not generating condensed water according to the current power of the automobile domain controller and a heat dissipation coefficient of the automobile domain controller, the heat dissipation coefficient being used to represent a heat dissipation capability of the automobile domain controller. Meanwhile, a second flow of the cooling medium required for absorbing heat corresponding to the current power and not generating condensed water is determined according to the specific heat capacity parameter and the density of the cooling medium, the current power, and an absolute value of a difference between a temperature at an inlet of the heat dissipation cavity of the automobile domain controller and a lowest temperature of an inner wall of the heat dissipation cavity close to the circuit board. A minimum value of the first flow and the second flow is determined as a target flow of the cooling medium required for absorbing heat corresponding to the current power and not generating condensed water. Finally, a target opening of the regulating valve between the cooling medium supply device and the automobile domain controller is determined according to the target flow, and the regulating valve is controlled to open according to the target opening. In this way, the cooling medium with the target flow can be provided to the heat dissipation cavity of the automobile domain controller, so that the liquid cooling of the automobile domain controller can be realized and the inner wall of the heat dissipation cavity of the automobile domain controller can be prevented from generating condensed water. Based on this, the condensed water in the heat dissipation cavity can be prevented from gathering and dripping onto the circuit board in the automobile domain controller, so that the automobile domain controller can be prevented from being damaged.

[0012] In a possible implementation, the cooling medium supply device includes a pump and a heat exchange device. The heat exchange device is configured to store the cooling medium. The pump is connected with the heat exchange device and each regulating valve.

[0013] In a possible implementation, the pump is further connected with each flow controller, and is configured to determine a total flow according to the target flow determined by each flow controller, and extract the cooling medium from the heat exchange device according to the total flow.

[0014] In a possible implementation, each automobile domain controller further includes a circuit board located below the heat dissipation cavity, and the liquid cooling control system of the automobile domain controller further includes:

[0015] an inlet temperature sensor arranged at an inlet of each heat dissipation cavity;

[0016] An ambient temperature sensor is used to collect the ambient temperature of the environment near the inner wall of the heat dissipation cavity of each automotive domain controller, close to the circuit board.

[0017] In addition, an ambient humidity sensor is used to collect the ambient humidity of the environment near the inner wall of the heat dissipation cavity of each automotive domain controller.

[0018] Secondly, the present invention provides a liquid cooling control method for an automotive domain controller, applied to a liquid cooling control system of an automotive domain controller according to the first aspect and any possible implementation thereof, the method comprising:

[0019] The flow controller obtains the current power and heat dissipation coefficient of the corresponding automotive domain controller. The heat dissipation coefficient is used to characterize the heat dissipation capability of the automotive domain controller.

[0020] The flow controller determines the first flow rate based on the current power and heat dissipation coefficient;

[0021] The flow controller determines the second flow rate, which is the flow rate of the cooling medium required to absorb the heat corresponding to the current power without producing condensate.

[0022] The flow controller determines the target opening degree of the corresponding regulating valve based on the target flow rate, which is the minimum flow rate between the first flow rate and the second flow rate.

[0023] The flow controller controls the regulating valve to open according to the target opening degree.

[0024] In one possible implementation, the flow controller determines the second flow, including:

[0025] The flow controller obtains the specific heat capacity and density of the cooling medium, and obtains the temperature change, which is the absolute value of the difference between the temperature at the inlet of the heat dissipation cavity and the lowest temperature of the inner wall of the heat dissipation cavity.

[0026] The flow controller determines the second flow rate based on the temperature change, specific heat capacity, density, and current power.

[0027] In one possible implementation, obtaining the temperature change includes:

[0028] The flow controller obtains the first temperature at the inlet of the heat dissipation cavity of the automotive domain controller, and obtains the ambient temperature and humidity of the environment where the heat dissipation cavity is located near the inner wall of the circuit board in the automotive domain controller.

[0029] The flow controller determines the temperature change based on the first temperature, ambient temperature, and ambient humidity.

[0030] In one possible implementation, the flow controller determines the temperature change based on a first temperature, ambient temperature, and ambient humidity, including:

[0031] The flow controller determines the second temperature based on the ambient temperature, ambient humidity, and the preset humid air entropy-humidity mapping relationship. The second temperature is the critical temperature at which condensation occurs on the inner wall of the heat dissipation cavity near the circuit board.

[0032] The flow controller determines the temperature change as the difference between the first and second temperatures.

[0033] In one possible implementation, the liquid cooling control method for the above-mentioned automotive domain controller further includes:

[0034] The flow controller sends the target flow rate to the pump in the cooling medium supply device;

[0035] The pump determines the total flow rate based on the target flow rate sent by each flow controller;

[0036] The pump draws cooling medium from the heat exchange device of the cooling medium supply unit according to the total flow rate.

[0037] Thirdly, the present invention provides a vehicle comprising a liquid-cooled control system for an automotive domain controller, including the first aspect and any possible implementation thereof. Attached Figure Description

[0038] Figure 1 A schematic diagram of the structure of the liquid cooling control system for an automotive domain controller provided in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of an automotive domain controller provided in an embodiment of the present invention;

[0040] Figure 3 This is one of the flowcharts illustrating the liquid cooling control method for an automotive domain controller provided in an embodiment of the present invention;

[0041] Figure 4 A second schematic flowchart of the liquid cooling control method for an automotive domain controller provided in an embodiment of the present invention;

[0042] Figure 5 This is a wet air entropy diagram in an embodiment of the present invention. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, the use of "based on" or "according to" implies openness and inclusiveness, because processes, steps, calculations, or other actions "based on" or "according to" one or more of the stated conditions or values ​​may in practice be based on additional conditions or beyond the stated values.

[0045] To control the supply flow rate of the cooling medium and prevent condensation from forming on the surface of the automotive domain controller, thereby avoiding damage to the controller, this invention provides a liquid cooling control system, method, and vehicle for an automotive domain controller. A first flow rate of the cooling medium required to absorb heat corresponding to the current power without producing condensation is determined using the current power of the automotive domain controller and a heat dissipation coefficient characterizing its heat dissipation capacity. Simultaneously, a second flow rate of the cooling medium required to absorb heat corresponding to the current power without producing condensation is determined using the specific heat capacity parameter, density, current power, and the absolute value of the difference between the inlet temperature of the heat dissipation cavity and the lowest temperature near the inner wall of the heat dissipation cavity close to the circuit board. The minimum value between the first and second flow rates is determined as the target flow rate of the cooling medium required to absorb heat corresponding to the current power without producing condensation. Finally, a target opening degree of a regulating valve located between the cooling medium supply device and the automotive domain controller is determined based on the target flow rate, and the regulating valve is controlled to open according to the target opening degree. This allows for the supply of a target flow rate of cooling medium to the heat dissipation chamber of the automotive domain controller, providing liquid cooling while preventing condensation from forming on the inner walls of the chamber. This prevents condensation from accumulating in the chamber and dripping onto the circuit boards of the domain controller, thus avoiding damage.

[0046] This invention provides a liquid cooling control method for an automotive domain controller, which can be applied to the liquid cooling control system of an automotive domain controller. Figure 1 This invention illustrates a liquid-cooled control system for an automotive domain controller provided in an embodiment of the present invention.Figure 2 A schematic diagram of the structure of an automotive domain controller provided in an embodiment of the present invention is shown. Figure 1 As shown, the liquid cooling control system of the automotive domain controller may include: multiple automotive domain controllers 100, a cooling medium supply device 200, multiple regulating valves 300, and multiple flow controllers 400.

[0047] For example, such as Figure 2 As shown, an automotive domain controller 100 may include a printed circuit board (PCB) 110, a chip 120, a thermally conductive film layer 130, and a heat dissipation cavity 140 with an outlet and an inlet. The chip 120 is soldered onto the PCB 110, the thermally conductive film layer 130 is disposed on the chip 120, and the heat dissipation cavity 140 is disposed on the thermally conductive film layer 130. The thermally conductive film layer 130 is a film layer formed by applying thermally conductive material onto the chip 120.

[0048] like Figure 2 As shown, if the inlet temperature T1 of the heat dissipation cavity 140 is lower than the temperature T3 of the inner wall of the heat dissipation cavity near the PCB (i.e., point A), and the flow rate of the cooling medium flowing into the heat dissipation cavity 140 is too large, after a period of time, the internal temperature T2 of the heat dissipation cavity 140 will become lower than the temperature T3 of the inner wall of the heat dissipation cavity near the PCB. At this time, if the ambient humidity is high, a large amount of condensate will be generated on the inner wall of the heat dissipation cavity 140 near the PCB. When the condensate at point A reaches a certain amount, it will drip onto the PCB 110, causing electrochemical corrosion of the PCB 110, ultimately leading to the damage of the automotive domain controller.

[0049] It should be noted that when the cooling medium is uniformly mixed inside the heat dissipation cavity, the temperature T3 at point A is close to the cavity temperature T2. The inlet temperature T1 of the heat dissipation cavity 140 can be understood as the temperature of the cooling medium at the inlet of the heat dissipation cavity 140.

[0050] like Figure 1 As shown, the cooling medium supply device 200 is connected to each vehicle domain controller 100 and is used to provide cooling medium to the inlet of the heat dissipation cavity 140 of each vehicle domain controller 100, so that the cooling medium flows through the heat dissipation cavity 140 to absorb the heat of the thermal conductive film layer 130, and then absorb the heat generated by the chip 120 during operation, thereby achieving the purpose of heat dissipation for the vehicle domain controller.

[0051] For example, the cooling medium in the cooling medium supply device 200 can be a refrigerant such as water or ethylene glycol.

[0052] Optional, such as Figure 1As shown, the cooling medium supply device 200 may include a pump 210 and a heat exchange device 220. The heat exchange device 220 stores the cooling medium. The pump 210 is connected to the heat exchange device 220 and also to each regulating valve 300.

[0053] like Figure 1 As shown, a regulating valve 300 is connected to an automotive domain controller 100 and also to a cooling medium supply device 200.

[0054] like Figure 1 As shown, a flow controller 400 is connected to a regulating valve 300 and an automotive domain controller 100. It determines a first flow rate and a second flow rate based on the current power and heat dissipation coefficient of the automotive domain controller 100. The second flow rate is the flow rate of the cooling medium required to absorb heat corresponding to the current power without producing condensate. Based on the target flow rate, it determines the target opening degree of the regulating valve 300 and controls the regulating valve 300 to open at the target opening degree. The heat dissipation coefficient characterizes the heat dissipation capacity of the automotive domain controller. The target flow rate is the minimum of the first and second flow rates.

[0055] It should be noted that a vehicle domain controller and its corresponding flow controller can be two separate controllers. Of course, a flow controller can also be integrated within the corresponding vehicle domain controller.

[0056] Optionally, if the target flow rate is a first flow rate, then the target opening degree is the opening degree corresponding to the first flow rate. If the target flow rate is a second flow rate, then the target opening degree is greater than 0 and less than or equal to the opening degree corresponding to the second flow rate. In other words, if the second flow rate is less than the first flow rate, the flow rate of the cooling medium flowing through the heat dissipation cavity of the automotive domain controller only needs to be less than or equal to the second flow rate.

[0057] Optionally, the pump 210 is also connected to each flow controller 400 to determine the total flow rate based on the target flow rate determined by each flow controller 400, and to draw cooling medium from the heat exchange device 220 according to the total flow rate. When the corresponding regulating valve 300 opens to the target opening degree, the cooling medium drawn by the pump 210 can flow into the heat dissipation chamber 140 of the corresponding vehicle domain controller 100. For example, the heat exchange device 220 may be a compressor.

[0058] It should be noted that the regulating valve 300 and the heat dissipation chamber of the vehicle domain controller 100, the regulating valve 300 and the pump 210, and the pump 210 and the heat exchange device 220 can all be connected by pipes.

[0059] Optionally, to enable the recycling of the cooling medium, the cooling medium flowing out of the heat dissipation chamber of each vehicle domain controller can be returned to the heat exchanger. In the heat exchanger, the returned cooling medium can be cooled to its initial temperature for easy recycling.

[0060] Optionally, the liquid cooling control system of the above-mentioned automotive domain controller may further include: an inlet temperature sensor 510 disposed at the inlet of each heat dissipation cavity 140, an ambient temperature sensor 520 for collecting the ambient temperature of the environment near the inner wall of the heat dissipation cavity of each automotive domain controller close to the circuit board, and an ambient humidity sensor 530 for collecting the ambient humidity of the environment near the inner wall of the heat dissipation cavity of each automotive domain controller close to the circuit board.

[0061] The liquid cooling control method for an automotive domain controller provided in the embodiments of the present invention will now be described with reference to the accompanying drawings.

[0062] like Figure 3 As shown, the liquid cooling control method for an automotive domain controller provided in this embodiment of the invention includes the following steps 301 to 305.

[0063] 301. The flow controller obtains the current power and heat dissipation coefficient of the corresponding automotive domain controller.

[0064] The thermal coefficient characterizes the heat dissipation capability of an automotive domain controller and is an inherent property of each automotive domain controller. For example, a higher thermal coefficient indicates a stronger heat dissipation capability of the automotive domain controller.

[0065] 302. The flow controller determines the first flow rate based on the current power and heat dissipation coefficient.

[0066] The first flow rate is the minimum flow rate of cooling medium required to absorb the heat corresponding to the current power of the vehicle domain controller without producing condensate.

[0067] 303. The flow controller determines the second flow rate.

[0068] The second flow rate is the maximum flow rate of the cooling medium required to absorb the heat corresponding to the current power of the vehicle domain controller without producing condensate.

[0069] 304. The flow controller determines the target opening degree of the corresponding regulating valve based on the target flow rate, which is the minimum flow rate between the first flow rate and the second flow rate.

[0070] Optionally, if the target flow rate is a first flow rate (i.e., the first flow rate is less than the second flow rate), then the target opening degree is the opening degree corresponding to the first flow rate. If the target flow rate is a second flow rate (i.e., the second flow rate is less than the first flow rate), then the target opening degree is greater than 0 and less than or equal to the opening degree corresponding to the second flow rate. In other words, if the second flow rate is less than the first flow rate, the flow rate of the cooling medium flowing through the heat dissipation cavity of the automotive domain controller should be less than or equal to the second flow rate.

[0071] 305. The flow controller controls the regulating valve to open according to the target opening degree.

[0072] The liquid cooling control method for an automotive domain controller provided in this invention determines the first flow rate of the cooling medium required to absorb the heat corresponding to the current power without producing condensate by using the current power of the automotive domain controller and the heat dissipation coefficient, which characterizes the heat dissipation capacity of the automotive domain controller. Simultaneously, the second flow rate of the cooling medium required to absorb the heat corresponding to the current power without producing condensate is determined by using the specific heat capacity parameter, density, current power, and the absolute value of the difference between the inlet temperature of the heat dissipation cavity of the automotive domain controller and the lowest temperature of the inner wall of the heat dissipation cavity near the circuit board. The minimum value between the first and second flow rates is determined as the target flow rate of the cooling medium required to absorb the heat corresponding to the current power without producing condensate. Finally, the target opening degree of the regulating valve located between the cooling medium supply device and the automotive domain controller is determined based on the target flow rate. This target opening degree is the maximum opening degree, and the regulating valve is controlled to open according to the target opening degree. In this way, the cooling medium at the target flow rate can be provided to the heat dissipation cavity of the automotive domain controller, enabling liquid cooling of the automotive domain controller while ensuring that condensate does not form on the inner wall of the heat dissipation cavity. This prevents condensation from accumulating in the cooling chamber and dripping onto the circuit board of the automotive domain controller, thus avoiding damage to the automotive domain controller.

[0073] Optionally, in the liquid cooling control method for an automotive domain controller provided in this embodiment of the invention, each flow controller can control not only the regulating valve but also the cooling medium supply device. Specifically, the flow controller can also send a target flow rate to the pump in the cooling medium supply device. After receiving the target flow rate sent by each flow controller, the pump can determine the total flow rate based on the target flow rate and extract cooling medium from the heat exchange device of the cooling medium supply device based on the total flow rate.

[0074] In other words, the pump can extract all the cooling medium needed for heat dissipation of the vehicle domain controllers from the heat exchange device. When each flow controller controls the corresponding regulating valve to open to the target opening degree, the cooling medium extracted from the pump will flow to the heat dissipation chamber of the corresponding vehicle domain controller according to the corresponding target flow rate, thereby absorbing the heat of the corresponding vehicle domain controller.

[0075] Combination Figure 3 ,like Figure 4 As shown, step 303 above may specifically include steps 401 and 402.

[0076] 401. The flow controller acquires the specific heat capacity and density of the cooling medium, and also acquires the temperature change. The temperature change is the absolute value of the difference between the temperature at the inlet of the heat dissipation chamber of the automotive domain controller and the lowest temperature on the inner wall of the heat dissipation chamber near the circuit board.

[0077] Optionally, when the flow controller acquires the temperature change, it first needs to acquire the initial temperature at the inlet of the heat dissipation cavity of the automotive domain controller, as well as the ambient temperature and humidity of the environment where the inner wall of the heat dissipation cavity near the circuit board is located. Then, the flow controller determines the temperature change based on the initial temperature, ambient temperature, and ambient humidity.

[0078] Optionally, the flow controller determines the temperature change based on the first temperature, ambient temperature, and ambient humidity, which may include the following steps: First, the flow controller determines a second temperature based on the ambient temperature, ambient humidity, and a preset humid air entropy-humidity mapping relationship. The second temperature is the critical temperature inside the heat dissipation cavity when condensation occurs on the inner wall of the heat dissipation cavity near the circuit board. Then, the flow controller determines the temperature change as the difference between the first temperature and the second temperature.

[0079] It should be noted that the first temperature can be obtained by an inlet temperature sensor located at the inlet of each heat dissipation cavity, the ambient temperature can be obtained by an ambient temperature sensor, and the ambient humidity can be obtained by an ambient humidity sensor.

[0080] For example, the amount of temperature change can be determined by the following formula (1).

[0081] ΔT min =|T1-T 阈值 | (1)

[0082] Where, ΔT min T represents the temperature change; T1 is the first temperature; T 阈值 This is the second temperature.

[0083] Figure 5 A humidity map of humid air entropy is shown in an embodiment of the present invention. For example... Figure 5 As shown, there is a mapping relationship between ambient temperature and ambient humidity. When the ambient temperature reaches a certain value, the ambient humidity will reach 100%. At this point, if the ambient temperature continues to decrease, condensation will occur. Therefore, the ambient temperature corresponding to 100% humidity can be defined as the critical temperature, or the second temperature. In other words, the second temperature T...阈值 This is the minimum temperature to prevent condensation from forming on the automotive domain controller. To prevent condensation from forming on the inner wall of the heat sink cavity near the circuit board, the temperature of the inner wall of the heat sink cavity near the circuit board needs to be greater than or equal to this second temperature. The first temperature T... in It is a constant. Therefore, the temperature change ΔT at this time is... min It is the minimum temperature change required to prevent condensation in the automotive domain controller while ensuring complete heat dissipation.

[0084] 402. The flow controller determines the second flow rate based on the temperature change, specific heat capacity parameter, density, and current power.

[0085] For example, assuming that the heat Q generated by a vehicle domain controller is completely absorbed by the cooling medium flowing through its heat dissipation cavity and no condensation is produced, the second flow rate can be obtained according to the following formula (2).

[0086]

[0087] Where Y is the second flow rate; P is the current power; C is the specific heat capacity parameter of the cooling medium; and ρ is the density of the cooling medium.

[0088] From formula (2), it can be seen that the second flow rate Y is related to the temperature change ΔT. min The flow rate is inversely proportional to the first flow rate, and the second flow rate Y is the maximum flow rate of the cooling medium flowing through the heat dissipation cavity of the automotive domain controller. When the second flow rate is less than the first flow rate, the flow rate of the cooling medium flowing through the heat dissipation cavity of the automotive domain controller can be less than the second flow rate. Therefore, when the second flow rate Y decreases, the temperature change ΔT min If the temperature increases and the first temperature T1 remains constant, then the temperature T3 (or the internal temperature T2 of the heat dissipation cavity) near the inner wall of the circuit board will always be higher than the second temperature T. 阈值 At this time, no condensation will be generated inside the vehicle domain controller.

[0089] In practical applications, formula (2) can be determined based on the heat formula, Joule's law, and the relationship between the mass of the liquid and the flow rate and the flow time of the liquid.

[0090] For example, the heat formula can be expressed by the following formula (3), Joule's law can be expressed by the following formula (4), and the relationship between the mass of the liquid and the flow rate and time of the liquid can be expressed by the following formula (5).

[0091] Q = P × t (3)

[0092] Q = C × M × ΔT min (4)

[0093] M=ρ×Y×t (5)

[0094] Where Q is the heat generated by the vehicle domain controller during operation; M is the mass of the cooling medium; and t is the time it takes for the cooling medium to flow through the heat dissipation cavity. According to formulas (3) to (5), formula (2) for determining the flow rate Y of the cooling medium can be obtained.

[0095] The following specific examples illustrate in detail how to determine the flow rate of the cooling medium flowing through the heat dissipation cavity of the automotive domain controller when the target flow rate is the second flow rate, i.e., the second flow rate is less than the first flow rate.

[0096] Assuming the cooling medium is water, its specific heat capacity C is 3.3 kJ / (kg·℃), and its density ρ is 10³ kg / m³. 3 Assume the current power is 100W, the ambient temperature is 30℃, the ambient humidity is 80%, and the initial temperature is 24℃.

[0097] After the cooling medium enters the heat dissipation cavity, the temperature of the heat dissipation cavity will decrease, such as... Figure 5 As shown, when the temperature inside the heat dissipation cavity drops to 28℃, the ambient humidity is 100%. That is to say, from... Figure 5 The second temperature can be determined to be 28℃. Based on the specific parameters above and formula (2), it can be determined that when the second temperature is 28℃, the second flow rate Y is approximately 0.5L / min. To prevent condensation from forming on the inner wall of the heat dissipation cavity near the circuit board, the temperature of the inner wall of the heat dissipation cavity near the circuit board needs to be greater than or equal to 28℃. Therefore, the flow rate of the cooling medium flowing through the heat dissipation cavity of the automotive domain controller must be less than or equal to 0.5L / min. Accordingly, the target opening of the regulating valve can be determined based on 0.5L / min as greater than 0 and less than or equal to the opening corresponding to 0.5L / min. Therefore, the flow rate of the cooling medium flowing through the heat dissipation cavity of the automotive domain controller only needs to be less than or equal to 0.5L / min.

[0098] As mentioned above, if the collected ambient humidity is 100%, then the ambient temperature at that time is the second temperature. If the collected ambient humidity is less than 100%, then it is necessary to adjust the temperature based on both ambient temperature and humidity. Figure 5 In the humidity diagram of air entropy shown, the ambient temperature corresponding to an ambient humidity of 100% is determined and designated as the second temperature.

[0099] In another embodiment of the present invention, a vehicle is also provided, the vehicle including the liquid cooling control system of the above-described vehicle domain controller.

[0100] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software programs, implementation can be, in whole or in part, in the form of a computer program product. This computer program product includes one or more computer instructions. When these computer instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of the present invention is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device containing one or more servers, data centers, etc., that can be integrated with the medium. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state disks, SSDs).

[0101] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A liquid-cooled control system for an automotive domain controller, characterized in that, include: Multiple vehicle domain controllers, each vehicle domain controller including a heat dissipation cavity having an inlet and an outlet; A cooling medium supply device, connected to the vehicle domain controller, is used to supply cooling medium to the inlet of the heat dissipation chamber of the vehicle domain controller; Multiple regulating valves, one of which is connected to one of the vehicle domain controllers and also to the cooling medium supply device; Multiple flow controllers are provided, one of which is connected to a regulating valve and also to an automotive domain controller. The flow controller is configured to determine a first flow rate and a second flow rate based on the current power and heat dissipation coefficient of the automotive domain controller. The second flow rate is the flow rate of the cooling medium required to absorb heat corresponding to the current power without producing condensate. The flow controller also determines a target opening degree for the regulating valve based on the target flow rate and controls the regulating valve to open at the target opening degree. The heat dissipation coefficient characterizes the heat dissipation capacity of the automotive domain controller. The target flow rate is the minimum flow rate between the first and second flow rates.

2. The liquid-cooled control system for an automotive domain controller according to claim 1, characterized in that, The cooling medium supply device includes a pump and a heat exchange device; The heat exchange device is used to store the cooling medium; The pump is connected to the heat exchange device and also to each of the regulating valves.

3. The liquid cooling control system for an automotive domain controller according to claim 2, characterized in that, The pump is also connected to each of the flow controllers for determining the total flow rate based on the target flow rate determined by each of the flow controllers, and for drawing the cooling medium from the heat exchange device based on the total flow rate.

4. The liquid-cooled control system for an automotive domain controller according to any one of claims 1 to 3, characterized in that, Each of the vehicle domain controllers also includes a circuit board located below the heat dissipation cavity, and the liquid cooling control system of the vehicle domain controller further includes: An inlet temperature sensor is installed at the inlet of each of the heat dissipation chambers; An ambient temperature sensor is used to collect the ambient temperature of the environment near the inner wall of the heat dissipation cavity of each of the vehicle domain controllers, close to the circuit board. In addition, an ambient humidity sensor is used to collect the ambient humidity of the environment near the inner wall of the heat dissipation cavity of each of the vehicle domain controllers.

5. A liquid cooling control method for an automotive domain controller, applied to the liquid cooling control system of the automotive domain controller as described in any one of claims 1 to 4, characterized in that, include: The flow controller obtains the current power and heat dissipation coefficient of the corresponding vehicle domain controller, wherein the heat dissipation coefficient is used to characterize the heat dissipation capability of the vehicle domain controller. The flow controller determines the first flow rate based on the current power and the heat dissipation coefficient; The flow controller determines a second flow rate, which is the flow rate of the cooling medium required to absorb the heat corresponding to the current power without producing condensate. The flow controller determines the target opening degree of the corresponding regulating valve based on the target flow rate, wherein the target flow rate is the minimum flow rate between the first flow rate and the second flow rate. The flow controller controls the regulating valve to open according to the target opening degree.

6. The liquid cooling control method for an automotive domain controller according to claim 5, characterized in that, The flow controller determines the second flow, including: The flow controller acquires the specific heat capacity parameter and density of the cooling medium, and acquires the temperature change, which is the absolute value of the difference between the temperature at the inlet of the heat dissipation cavity and the lowest temperature of the inner wall of the heat dissipation cavity near the circuit board. The flow controller determines the second flow rate based on the temperature change, the specific heat capacity parameter, the density, and the current power.

7. The liquid cooling control method for an automotive domain controller according to claim 6, characterized in that, The acquisition of temperature change includes: The flow controller obtains the first temperature at the inlet of the heat dissipation cavity of the vehicle domain controller, and obtains the ambient temperature and humidity of the environment where the heat dissipation cavity near the inner wall of the circuit board in the vehicle domain controller is currently located. The flow controller determines the temperature change based on the first temperature, the ambient temperature, and the ambient humidity.

8. The liquid cooling control method for an automotive domain controller according to claim 7, characterized in that, The flow controller determines the temperature change based on the first temperature, the ambient temperature, and the ambient humidity, including: The flow controller determines a second temperature based on the ambient temperature, the ambient humidity, and a preset humid air entropy-humidity mapping relationship. The second temperature is the critical temperature at which condensation occurs on the inner wall of the heat dissipation cavity near the circuit board. The flow controller determines the temperature change as the difference between the first temperature and the second temperature.

9. The liquid cooling control method for an automotive domain controller according to any one of claims 5 to 8, characterized in that, The liquid cooling control method for the automotive domain controller further includes: The flow controller sends the target flow rate to the pump in the cooling medium supply device; The pump determines the total flow rate based on the target flow rate sent by each of the flow controllers; The pump draws the cooling medium from the heat exchange device of the cooling medium supply device according to the total flow rate.

10. A vehicle, characterized in that, The vehicle includes a liquid-cooled control system for an automotive domain controller as described in any one of claims 1 to 4.

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