Vehicle thermal management system and control method thereof

Abstract

The invention discloses a vehicle thermal management system and a control method thereof, and relates to the technical field of vehicle engineering. The vehicle thermal management system comprises a first liquid cooling pipeline used for being connected to a heat dissipation object; and the at least two liquid cooling assemblies are connected to the two ends of the first liquid cooling pipeline respectively, and each liquid cooling assembly is selectively started and can refrigerate the cooling working medium in the first liquid cooling pipeline after being started. According to the vehicle thermal management system, due to the fact that the at least two liquid cooling assemblies are arranged, each liquid cooling assembly can be independently controlled and opened and closed, the starting number of the liquid cooling assemblies can be switched according to the heat dissipation requirement of the heat dissipation object, and therefore the refrigeration requirement of the heat dissipation object is met adaptively. And meanwhile, different liquid cooling assemblies can be assembled respectively by selecting available spaces in the equipment, so that the arrangement is more flexible, a larger mounting space does not need to be reserved independently, and the space can be utilized more reasonably.

Description

Technical Field

[0001] The present invention relates to the field of thermal management technology, and in particular to a vehicle thermal management system and a control method thereof. Background Art

[0002] As the power of the vehicle's battery increases, the size of the liquid-cooled heat exchanger of the corresponding battery thermal management unit also increases to meet greater heat dissipation needs.

[0003] In the process of implementing the present application, the inventors found that the prior art has at least the following problems: due to the increase in the volume of the liquid-cooled heat exchanger, the volume and weight of the system unit are larger, but the space of the whole vehicle is limited. The arrangement of a larger liquid-cooled heat exchanger is likely to interfere with the layout of other components of the whole vehicle, making it difficult to take into account both the heat dissipation capacity and the space layout.

[0004] Therefore, how to more reasonably utilize space while meeting the refrigeration demand is a technical problem that technicians in this field currently need to solve. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a vehicle thermal management system and a control method thereof, which can more reasonably utilize space while meeting cooling needs.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A vehicle thermal management system includes: a first liquid cooling pipeline for connecting to a heat dissipation object; at least two liquid cooling components, each of which is connected to the two ends of the first liquid cooling pipeline, each of which can be selectively started and can cool the cooling medium in the first liquid cooling pipeline after starting.

[0008] Optionally, a multi-way valve is provided at one end of the first liquid cooling pipeline, each outlet of the multi-way valve is respectively connected to each of the liquid cooling components, and each outlet on the multi-way valve is opened when the corresponding liquid cooling component is started.

[0009] Optionally, a water pump is provided on the first liquid cooling pipeline.

[0010] Optionally, the liquid cooling assembly includes a second liquid cooling pipeline, a liquid cooling heat exchanger, a first refrigerant pipeline, and a refrigeration device;

[0011] The second liquid cooling pipeline is connected to the heat medium passage of the liquid cooling heat exchanger, and two ends of the second liquid cooling pipeline are respectively connected to two ends of the first liquid cooling pipeline to form a loop for the flow of cooling medium;

[0012] The first refrigerant pipeline is connected to the refrigerant passage of the liquid-cooled heat exchanger, and both ends of the first refrigerant pipeline are respectively connected to the refrigeration device to form a loop for the refrigerant to flow.

[0013] Optionally, a throttling element is respectively provided on each of the first refrigerant pipelines.

[0014] Optionally, each of the liquid cooling components shares the same refrigeration device.

[0015] Optionally, the refrigeration device includes a compressor connected to the outlet end of the first refrigerant pipeline, a condensing heat exchanger connected to the outlet end of the compressor, and a condensing fan for air cooling the condensing heat exchanger, and the outlet end of the condensing heat exchanger is connected to the inlet end of the first refrigerant pipeline.

[0016] A control method for a vehicle thermal management system is applied to the above vehicle thermal management system, and the control method comprises:

[0017] Determining the refrigeration level of the real-time first temperature of the cooling medium in the first liquid cooling pipeline;

[0018] According to the cooling level, controlling a corresponding preset number of the liquid cooling components to be turned on;

[0019] There are at least two refrigeration levels, each of which corresponds to a different temperature range value. As the refrigeration level increases, the temperature in the corresponding temperature range value becomes higher, and the corresponding preset number increases.

[0020] Optionally, it also includes:

[0021] Determine whether the real-time second temperature of the heat dissipation object meets the preset cooling condition, and if so, determine the refrigeration level of the real-time first temperature of the cooling medium in the first liquid cooling pipeline.

[0022] Optionally, the refrigeration level includes a first level, at which all the liquid cooling components are started;

[0023] The temperature range value corresponding to the first level includes a preset high temperature threshold;

[0024] At the first level:

[0025] When the first temperature is higher than the preset high temperature threshold, each of the liquid cooling components provides a maximum cooling capacity;

[0026] When the first temperature is not higher than a preset high temperature threshold, the lower the first temperature is, the lower the total cooling capacity provided by all the liquid cooling components is.

[0027] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects:

[0028] The vehicle thermal management system provided by the present invention includes: a first liquid cooling pipeline, which is used to be connected to a heat dissipation object; at least two liquid cooling components, each of which is respectively connected to the two ends of the first liquid cooling pipeline, and each liquid cooling component can be selectively started, and can cool the cooling medium in the first liquid cooling pipeline after starting.

[0029] In this vehicle thermal management system, since there are at least two liquid cooling components, each liquid cooling component can be independently controlled and opened and closed, and the number of liquid cooling components started can be switched according to the heat dissipation requirements of the heat dissipation object, so as to adaptably meet the cooling requirements of the heat dissipation object. At the same time, different liquid cooling components can be installed separately in the available space of the equipment, and the layout is more flexible, without the need to set aside a large installation space separately, and the space can be used more reasonably.

[0030] In summary, the vehicle thermal management system provided by the present invention can more reasonably utilize space while meeting cooling requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0032] FIG1 is a schematic diagram of a specific embodiment 1 of a vehicle thermal management system provided by the present invention operating in a low-load mode;

[0033] FIG2 is a schematic diagram of a first specific embodiment of a vehicle thermal management system provided by the present invention operating in a high load mode;

[0034] FIG. 3 is a flow chart of a specific embodiment 1 of the control method provided by the present invention.

[0035] Reference numerals:

[0036] Battery 1;

[0037] Refrigeration device 2, compressor 21, condensing heat exchanger 22, condensing fan 23, second refrigerant pipeline 24;

[0038] Liquid cooling component 3, second liquid cooling pipeline 31, first refrigerant pipeline 32, liquid cooling heat exchanger 33, first liquid cooling heat exchanger 331, second liquid cooling heat exchanger 332, electronic expansion valve 34, first electronic expansion valve 341, second electronic expansion valve 342, first liquid cooling component 35, second liquid cooling component 36;

[0039] The first liquid cooling pipeline 4 , the three-way valve 41 , the water pump 42 , and the temperature sensor 43 . DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The core of the present invention is to provide a vehicle thermal management system and a control method thereof, which can more reasonably utilize space while meeting cooling needs.

[0042] Specific embodiment 1 of the vehicle thermal management system provided by the present invention, please refer to FIG. 1 and FIG. 2 , includes a first liquid cooling pipeline 4 and at least two liquid cooling components 3 .

[0043] The first liquid cooling pipeline 4 is used to be connected to a heat dissipation object. The heat dissipation object is a battery 1. In other embodiments, the heat dissipation object may also be other devices in the vehicle, such as an electronic control or an electric drive, according to actual needs. The first liquid cooling pipeline 4 may be attached to the outer surface of the heat dissipation object, or flow through the interior of the heat dissipation object, so that when the cooling medium in the first liquid cooling pipeline 4 flows through the heat dissipation object, it provides cooling for the heat dissipation object, takes away the heat of the heat dissipation object, and realizes cooling of the heat dissipation object.

[0044] Each liquid cooling component 3 is connected to both ends of the first liquid cooling pipeline 4, and each liquid cooling component 3 is equivalent to being connected in parallel to the first liquid cooling pipeline 4. Each liquid cooling component 3 can be selectively started, and the liquid cooling component 3 can cool the cooling medium in the first liquid cooling pipeline 4 after starting, that is, after the liquid cooling component 3 is started, the cooling medium in the first liquid cooling pipeline 4 can be cooled. In this embodiment, two liquid cooling components 3 are provided, namely the first liquid cooling component 35 and the second liquid cooling component 36; in other embodiments, there can also be three or other numbers.

[0045] In this vehicle thermal management system, since there are at least two liquid cooling components 3, each liquid cooling component 3 can be independently controlled and opened and closed, and the number of liquid cooling components 3 started can be switched according to the heat dissipation requirements of the heat dissipation object, so as to adaptably meet the cooling requirements of the heat dissipation object. At the same time, different liquid cooling components 3 can be installed separately in the available space in the equipment, and the layout is more flexible. There is no need to set aside a large installation space separately, and the space can be used more reasonably. That is, the vehicle thermal management system can meet the cooling needs while making more reasonable use of space.

[0046] In the first liquid cooling pipeline 4, as shown in Figure 1, a multi-way valve is arranged at one end of the first liquid cooling pipeline 4, the inlet of the multi-way valve is connected to the first liquid cooling pipeline 4, and each interface (outlet) of the multi-way valve is respectively connected to each liquid cooling component 3, and each interface on the multi-way valve is opened when the corresponding liquid cooling component 3 is started. By controlling the opening and closing of different interfaces of the multi-way valve, the number of liquid cooling components 3 connected to the first liquid cooling pipeline 4 can be reliably controlled, so that the cooling medium in the first liquid cooling pipeline 4 can enter the opened liquid cooling component 3 for cooling, and no longer enter the closed liquid cooling component 3.

[0047] Among them, after the multi-way valve is connected to the first liquid cooling pipeline 4, the number of remaining interfaces should meet the connection requirements of the liquid cooling components 3 and should not be less than the number of liquid cooling components 3. In this embodiment, since there are two liquid cooling components 3, the multi-way valve can adopt a three-way valve 41, more specifically an electric three-way ball valve. One port of the three-way valve 41 is connected to the first liquid cooling pipeline 4, and the remaining two interfaces are connected to the two liquid cooling components 3 respectively.

[0048] As shown in FIG1 , a water pump 42 is also provided on the first liquid cooling pipeline 4 to realize a uniform drive of the cooling medium entering the first liquid cooling pipeline 4, which is conducive to reducing space occupation. At this time, compared with the traditional large radiator and long pipeline setting, a smaller water pump can be selected for the water pump 42. Of course, in other embodiments, a water pump for driving the cooling medium can also be provided in each liquid cooling component 3.

[0049] In the liquid cooling component 3, as shown in FIG1 , it includes a second liquid cooling pipeline 31, a liquid cooling heat exchanger 33, a first refrigerant pipeline 32, and a refrigeration device 2. Among them, in the first liquid cooling component 35, the liquid cooling heat exchanger 33 is a first liquid cooling heat exchanger 331, and in the second liquid cooling component 36, the liquid cooling heat exchanger 33 is a second liquid cooling heat exchanger 332.

[0050] Among them, the second liquid cooling pipeline 31 is connected to the heat medium passage of the liquid cooling heat exchanger 33, that is, the second liquid cooling pipeline 31 is connected to the passage of the liquid cooling heat exchanger 33 for circulating the cooling medium, and the two ends of the second liquid cooling pipeline 31 are respectively connected to the two ends of the first liquid cooling pipeline 4, that is, one end of the second liquid cooling pipeline 31 is connected to an interface of the three-way valve 41, and the other end of the second liquid cooling pipeline 31 is connected to the water pump 42 to form a loop for the flow of cooling medium.

[0051] Among them, the first refrigerant pipeline 32 is connected to the refrigerant passage of the liquid-cooled heat exchanger 33, that is, the first refrigerant pipeline 32 is connected to the passage of the liquid-cooled heat exchanger 33 for circulating the refrigerant (or refrigerant), and the two ends of the first refrigerant pipeline 32 are respectively connected to the refrigeration device 2 to form a loop for the flow of refrigerant.

[0052] Among them, when the liquid cooling component 3 is started, in the corresponding liquid cooling heat exchanger 33, the refrigerant in the refrigerant path can cool the cooling medium in the heat medium path, that is, the refrigerant in the refrigerant path absorbs the heat of the cooling medium in the heat medium path, so that the cooling medium in the heat medium path is cooled.

[0053] The liquid-cooled heat exchanger 33 may be a plate heat exchanger, and in other embodiments, a shell and tube heat exchanger may also be used.

[0054] As shown in FIG1 , a throttling element is respectively provided on each first refrigerant pipeline 32, and specifically, an electronic expansion valve 34 can be used, wherein the electronic expansion valve 34 provided on the first refrigerant pipeline 32 of the first liquid cooling component 35 is a first electronic expansion valve 341, and the electronic expansion valve 34 provided on the first refrigerant pipeline 32 of the second liquid cooling component 36 is a second electronic expansion valve 342. In other embodiments, the throttling element can also be a throttling tube, such as a capillary tube.

[0055] The opening and closing of the liquid cooling component 3 can be controlled by opening and closing the electronic expansion valve 34. When the electronic expansion valve 34 is closed, the refrigerant does not enter the corresponding liquid cooling heat exchanger 33 for heat exchange, which is equivalent to the liquid cooling component 3 being in a closed state. In addition, since the opening of the electronic expansion valve 34 is adjustable, the refrigeration capacity of the corresponding liquid cooling component 3 can also be controlled by controlling the electronic expansion valve 34.

[0056] As shown in Fig. 1, each liquid cooling component 3 can share the same refrigeration device 2 to further save space. Of course, in other embodiments, each liquid cooling component 3 can also be provided with an independent refrigeration device 2. In this case, the opening and closing of different liquid cooling components 3 can also be achieved by opening and closing the corresponding refrigeration device 2.

[0057] As shown in FIG1 , the refrigeration device 2 includes a compressor 21 connected to the outlet end of the first refrigerant pipeline 32, a condensing heat exchanger 22 connected to the outlet end (exhaust port) of the compressor 21, and a condensing fan 23 for air cooling and heat dissipation of the condensing heat exchanger 22. The outlet end of the condensing heat exchanger 22 is connected to the inlet end of the first refrigerant pipeline 32.

[0058] Specifically, the outlet end of each first refrigerant pipeline 32 is connected to the second refrigerant pipeline 24, and the second refrigerant pipeline 24 is connected to the compressor 21 and the condensing heat exchanger 22 in sequence, and then connected to the inlet end of each first refrigerant pipeline 32. During refrigeration, the refrigerant is compressed by the compressor 21, discharged from the exhaust port of the compressor 21, flows through the condensing heat exchanger 22, and the heat of the condensing heat exchanger 22 is taken away by the condensing fan 23. The cooled refrigerant enters the first refrigerant pipeline 32 opened by the electronic expansion valve 34, and then enters the corresponding liquid-cooled heat exchanger 33, cools the refrigerant, and then flows back to the compressor 21. It can be understood that the electronic expansion valve 34 is arranged before the refrigerant passage of the liquid-cooled heat exchanger 33, that is, upstream, and the refrigerant after throttling and pressure reduction by the electronic expansion valve 34 flows into the refrigerant passage of the liquid-cooled heat exchanger 33 for heat exchange. Taking Figure 2 as an example, the low-temperature and low-pressure liquid refrigerant (or low-temperature and low-pressure gas-liquid mixture) after throttling and reducing the pressure by the first electronic expansion valve 341 flows into the refrigerant passage of the first liquid-cooled heat exchanger 331, absorbs the heat of the cooling medium in the heat medium passage from the first liquid-cooled heat exchanger 331, evaporates into a low-temperature and low-pressure gaseous refrigerant (or refrigerant gas), and then flows back to the compressor 21 through the first refrigerant pipeline 32 and the second refrigerant pipeline 24 in turn for the next cycle.

[0059] The vehicle thermal management system in this embodiment has two liquid cooling components 3, which can control the number of liquid cooling components 3 that are started, and can also control the operating power of equipment such as the water pump 42 and the compressor 21, as well as the opening of different valves, to adjust the refrigeration capacity and the amount of cold provided to the battery 1. Specifically, it can include the following two working modes:

[0060] 1. Low load mode, referring to FIG. 1 , the second liquid cooling component 36 is started, and the first liquid cooling component 35 is turned off, that is, only the second liquid cooling component 36 cools the cooling medium:

[0061] The high-temperature coolant in the first liquid-cooling pipeline 4 is driven by the water pump 42, flows through the three-way valve 41 and enters the second liquid-cooling heat exchanger 332, exchanges heat with the low-temperature refrigerant in the second liquid-cooling heat exchanger 332 to release heat, and then reduces the temperature to become a low-temperature coolant, and then flows back to the first liquid-cooling pipeline 4 to absorb heat from the battery 1, thus completing the cycle.

[0062] In the second liquid cooling component 36, the refrigerant is compressed by the compressor 21 and then discharged from the exhaust port, flows through the condensing heat exchanger 22, and the heat of the condensing heat exchanger 22 is taken away by the condensing fan 23. After forced heat exchange with the environment, it condenses and flows to the second electronic expansion valve 342. After throttling, it enters the second liquid cooling heat exchanger 332, absorbs heat from the cooling medium, and then flows back to the air intake port (inlet end) of the compressor 21, thus circulating.

[0063] 2. High load mode, referring to FIG. 2 , the first liquid cooling component 35 and the second liquid cooling component 36 are both started, that is, both can cool the cooling medium:

[0064] When the temperature of battery 1 is high or in a high-power heat release condition and a large amount of cooling is required for heat dissipation, the hot cooling medium is driven by the water pump 42 through the first liquid cooling pipeline 4, flows into the three-way valve 41 after passing through the battery 1, and then flows into the first liquid cooling heat exchanger 331 and the second liquid cooling heat exchanger 332 respectively, and becomes a cold cooling medium after heat exchange respectively, and then enters the first liquid cooling pipeline 4 again, and circulates in this way.

[0065] In the first liquid cooling component 35 and the second liquid cooling component 36, the refrigerant is compressed by the compressor 21 and then discharged from the exhaust port, flows through the condensing heat exchanger 22, and the hot air is blown to the outside by the condensing fan 23. After forced heat exchange with the environment, it condenses and then flows to the first electronic expansion valve 341 and the second electronic expansion valve 342. After throttling, it enters the first liquid cooling heat exchanger 331 and the second liquid cooling heat exchanger 332 to absorb heat, and then flows back to the air intake port of the compressor 21, thus circulating.

[0066] The vehicle thermal management system in this embodiment has two liquid cooling components 3, which are divided into two sets of cooling water circuits. On the basis of ensuring the heat dissipation function of the original battery 1, the original single large-volume liquid cooling heat exchanger 33 is changed to two small-volume liquid cooling heat exchangers 33 connected in parallel on both sides, which can effectively reduce water resistance and realize independent control, meet the heat dissipation of the battery 1 under different requirements, take into account the heat dissipation conditions under different cooling requirements, and use a low-power water pump 42 to complete the water circuit operation, and can use a longer pipeline layout, the layout of the whole machine is more concise and flexible, effectively save space and cost, greatly reduce weight, and ensure adaptability to the whole vehicle. When the heat dissipation demand is low, a single liquid cooling heat exchanger 33 can be used for heat dissipation to avoid overshoot of cooling capacity, reduce the number of unit start-up and shutdown, and greatly extend the service life of the unit.

[0067] In addition to the above-mentioned vehicle thermal management system, the present invention also provides a control method of the vehicle thermal management system, which is applied to the above-mentioned vehicle thermal management system.

[0068] As shown in FIG3 , in a specific embodiment 1 of the control method, the following steps are included:

[0069] S1: Determine the refrigeration level of the real-time first temperature t of the cooling medium in the first liquid cooling pipeline 4.

[0070] The first temperature t may specifically be the outlet temperature of water after flowing through the heat dissipation object from the first liquid cooling pipeline 4 , which is detected by a temperature sensor 43 disposed at a set position on the outlet side of the first liquid cooling pipeline 4 after flowing through the heat dissipation object.

[0071] S2: According to the refrigeration level, control a corresponding preset number of liquid cooling components 3 to be turned on.

[0072] There are at least two refrigeration levels, and each refrigeration level corresponds to a different temperature range value. As the refrigeration level increases, the temperature in the corresponding temperature range value becomes higher, and the corresponding preset number increases.

[0073] At this time, the real-time first temperature t of the cooling medium reflects the current heat situation of the heat dissipation object. When the real-time first temperature t of the cooling medium meets the temperature requirement, it is considered that the cooling demand of the heat dissipation object is met.

[0074] In this embodiment, referring to Figures 1 and 2, there are two liquid cooling components 3, and the cooling levels are first level, second level and third level from high to low. At the first level, both liquid cooling components 3 are started, at the second level, only the second liquid cooling component 36 is started, and at the third level, both liquid cooling components 3 are turned off.

[0075] Among them, different cooling levels correspond to non-overlapping temperature range values, and each temperature range value can be a continuous temperature interval. In this embodiment, the temperature range values ​​corresponding to the three cooling levels are divided by a preset low temperature threshold T2 and a preset safety threshold T3:

[0076] The first temperature t> the preset low temperature threshold T2, the first temperature t is at the first level;

[0077] The preset safety threshold T3≤the first temperature t<the preset low temperature threshold T2, and the first temperature t is at the second level;

[0078] The first temperature t is less than the preset safety threshold T3, and the first temperature t is at the third level.

[0079] Then in S2:

[0080] S21: When the first temperature t is at the first level, the two liquid cooling components 3 are controlled to be turned on.

[0081] Specifically, in S21 , the water pump 42 is controlled to start, the first electronic expansion valve 341 and the second electronic expansion valve 342 are controlled to open, and the compressor 21 and the condensing fan 23 are controlled to start.

[0082] S22: When the first temperature t is at the second level, the first liquid cooling component 35 is controlled to be closed, and the second liquid cooling component 36 is controlled to be opened.

[0083] Specifically, in S22 , the water pump 42 is controlled to start, the second electronic expansion valve 342 is controlled to open and the first electronic expansion valve 341 is controlled to close, and the compressor 21 and the condensing fan 23 are controlled to start.

[0084] The opening of the second electronic expansion valve 342, the operating power of the compressor 21, and the operating power of the condensing fan 23 can be adaptively adjusted according to the actual operating conditions. Specifically, the operating power of the condensing fan 23 needs to be adaptively adjusted according to the condensing pressure of the condensing heat exchanger 22.

[0085] S23: When the first temperature t is at the third level, the two liquid cooling components 3 are controlled to be closed.

[0086] Specifically, in S23 , the water pump 42 is controlled to be turned off, each electronic expansion valve 34 is controlled to be turned off, and the compressor 21 and the condensing fan 23 are controlled to be stopped.

[0087] In this embodiment, the refrigeration level is divided according to the temperature of the coolant in the first liquid cooling pipeline 4, and the start-up number of the liquid cooling components 3 is controlled, so that the cooling temperature provided by the coolant always tends to the set target temperature, and can reliably dissipate heat for the battery 1 while avoiding waste of cold energy and saving energy.

[0088] In addition, in order to improve the matching of the cooling capacity and the heat dissipation requirements of the battery 1, the control method further includes:

[0089] S0: Determine whether the real-time second temperature of the heat dissipation object meets the preset cooling condition. If so, enter S1.

[0090] The second temperature of the heat dissipation object may specifically be the cell temperature of the battery 1 or the electric drive temperature.

[0091] Among them, in the vehicle, when the host computer sends a BMS (Batery Management System) instruction to the vehicle thermal management system, the vehicle thermal management system enters a standby state. When the temperature of the heat dissipation object meets the preset cooling conditions, the host computer sends a heat dissipation instruction, and the vehicle thermal management system receives the heat dissipation instruction and enters S1.

[0092] It should be noted that the preset cooling condition for the heat dissipation object is a real-time comparison result between the second temperature and the temperature threshold. For example, when the second temperature is greater than the temperature threshold, the preset cooling condition is met; or, it is a comparison result between the average value of the second temperature over a period of time and the set temperature range. When the average value of the second temperature over a period of time is within the set temperature range, the preset cooling condition is met.

[0093] In S21, to ensure sufficient cooling capacity at the first level, that is, when the cooling medium has a high cooling demand, the temperature range value corresponding to the first level includes a preset high temperature threshold T1. Specifically, the preset high temperature threshold T1>the preset low temperature threshold T2.

[0094] At this point, at the first level:

[0095] In S21:

[0096] S211: When the first temperature t is higher than the preset high temperature threshold T1, each liquid cooling component 3 provides a maximum cooling capacity.

[0097] Specifically, in S211 , the water pump 42 is controlled to run at full power, the first electronic expansion valve 341 and the second electronic expansion valve 342 are controlled to open, and the compressor 21 and the condensing fan 23 are controlled to run at full power.

[0098] The opening degrees of the first electronic expansion valve 341 and the second electronic expansion valve 342 are preset according to the superheat of the cooling medium.

[0099] S212: When the first temperature t is not higher than the preset high temperature threshold T1, that is, the preset low temperature threshold T2<first temperature t≤preset high temperature threshold T1, and the lower the first temperature t is, the lower the total cooling capacity provided by all liquid cooling components 3 is, thereby matching the cooling demand of the cooling medium.

[0100] Among them, the correspondence between the size of the first temperature t and the total cooling capacity provided by all liquid cooling components 3 can be pre-stored. When in use, after obtaining the first temperature t, the total cooling capacity provided by all corresponding liquid cooling components 3 and the corresponding control method of the liquid cooling component 3 can be directly called.

[0101] Specifically, in S212, as the first temperature t decreases, the power of the water pump 42 is reduced, and / or the opening of the first electronic expansion valve 341 is reduced, and / or the opening of the second electronic expansion valve 342 is reduced, and / or the power of the compressor 21 is reduced, and / or the power of the condensing fan 23 is reduced. At this time, as the first temperature t decreases, if only one or part of the parameters of the above-mentioned components increase accordingly, the corresponding parameters of the remaining components may remain unchanged or increase, but it is necessary to ensure that the overall total refrigeration capacity is reduced.

[0102] As the first temperature t increases, the power of the water pump 42 is increased, and / or the opening of the first electronic expansion valve 341 is increased, and / or the opening of the second electronic expansion valve 342 is increased, and / or the power of the compressor 21 is increased, and / or the power of the condensing fan 23 is increased. At this time, as the first temperature t increases, if only one or part of the parameters of the above-mentioned components increase accordingly, the corresponding parameters of the remaining components may remain unchanged or decrease, but it is necessary to ensure that the overall total refrigeration capacity is improved.

[0103] In addition, when the first temperature t drops to the preset low temperature threshold value T2, that is, entering the second level, the water pump 42, the compressor 21, and the condensing fan 23 can all maintain the preset minimum power operation.

[0104] It should be noted that when an element is referred to as "fixed" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element in the middle. In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple roots", "multiple groups" mean two or more.

[0105] The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0106] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0107] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0108] The above is a detailed introduction to the vehicle thermal management system and control method thereof provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A vehicle thermal management system, characterized in that: include: A first liquid cooling pipeline (4), used for connecting to a heat dissipation object; At least two liquid cooling components (3), each of the liquid cooling components (3) being connected to two ends of the first liquid cooling pipeline (4), each of the liquid cooling components (3) being selectively startable, and being able to cool the cooling medium in the first liquid cooling pipeline (4) after start-up.

2. The vehicle thermal management system according to claim 1, characterized in that: A multi-way valve is provided at one end of the first liquid cooling pipeline (4), each outlet of the multi-way valve is respectively connected to each of the liquid cooling components (3), and each outlet on the multi-way valve is opened when the corresponding liquid cooling component (3) is started.

3. The vehicle thermal management system according to claim 1, characterized in that: A water pump (42) is provided on the first liquid cooling pipeline (4).

4. The vehicle thermal management system according to claim 1, characterized in that: The liquid cooling component (3) comprises a second liquid cooling pipeline (31), a liquid cooling heat exchanger (33), a first refrigerant pipeline (32), and a refrigeration device (2); The second liquid cooling pipeline (31) is connected to the heat medium passage of the liquid cooling heat exchanger (33), and the two ends of the second liquid cooling pipeline (31) are respectively connected to the two ends of the first liquid cooling pipeline (4) to form a loop for the flow of cooling medium; The first refrigerant pipeline (32) is connected to the refrigerant passage of the liquid-cooled heat exchanger (33), and both ends of the first refrigerant pipeline (32) are respectively connected to the refrigeration device (2) to form a loop for the refrigerant to flow.

5. The vehicle thermal management system according to claim 4, characterized in that: A throttling element is respectively provided on each of the first refrigerant pipelines (32).

6. The vehicle thermal management system according to claim 5, characterized in that: Each of the liquid cooling components (3) shares the same refrigeration device (2).

7. The vehicle thermal management system according to claim 6, characterized in that: The refrigeration device (2) comprises a compressor (21) connected to the outlet end of the first refrigerant pipeline (32), a condensing heat exchanger (22) connected to the outlet end of the compressor (21), and a condensing fan (23), wherein the outlet end of the condensing heat exchanger (22) is connected to the inlet end of the first refrigerant pipeline (32).

8. A control method for a vehicle thermal management system, characterized in that: Applied to the vehicle thermal management system according to any one of claims 1 to 7, the control method comprises: Determining the refrigeration level of the real-time first temperature of the cooling medium in the first liquid cooling pipeline (4); According to the refrigeration level, controlling a corresponding preset number of the liquid cooling components (3) to be turned on; There are at least two refrigeration levels, each of which corresponds to a different temperature range value. As the refrigeration level increases, the temperature in the corresponding temperature range value becomes higher, and the corresponding preset number increases.

9. The control method according to claim 8, characterized in that: Also includes: It is determined whether the real-time second temperature of the heat dissipation object meets the preset cooling condition, and if so, the refrigeration level of the real-time first temperature of the cooling medium in the first liquid cooling pipeline (4) is determined.

10. The control method according to claim 8, characterized in that: The refrigeration level includes a first level, at which all of the liquid cooling components (3) are started; The temperature range value corresponding to the first level includes a preset high temperature threshold; At the first level: When the first temperature is higher than the preset high temperature threshold, each of the liquid cooling components (3) provides maximum cooling capacity; When the first temperature is not higher than a preset high temperature threshold, the lower the first temperature is, the lower the total cooling capacity provided by all the liquid cooling components (3) is.

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