Engine thermal management system

Abstract

The utility model relates to the technical field of engines, and discloses an engine thermal management system which comprises a water tank, a water pump, a total thermostat, a control device, an engine body, a cylinder cover cooling assembly and a plurality of pipelines, and the cylinder cover cooling assembly and the engine body are arranged in parallel. When the engine is started in the cold state, the first branch is in the disconnected state, the total thermostat is in the first state, due to the fact that the first branch is disconnected, the engine body cannot be cooled by circulating cooling liquid, and cooling liquid circulation of the cylinder cover cooling assembly cannot be affected by disconnection of the first branch, that is, a cylinder cover of the engine can be fully cooled; therefore, the combustion efficiency and the emission performance of the engine are guaranteed, and the service life of the engine is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to an engine thermal management system. Background Technology

[0002] As a core component of the engine thermal management system, the engine cooling water circuit's main function is to remove the large amount of heat generated by the engine during operation through the circulation of coolant, keeping the engine components within a reasonable operating temperature range, thereby ensuring the engine's power output, fuel economy, and reliability. Poor cooling may lead to engine overheating, component deformation and damage, or even engine shutdown.

[0003] Currently, most engine cooling systems use a circulating thermal management method where the coolant first flows through the engine block and then into the cylinder head. However, due to the complex structure of the cylinder head, the local heat load on the cylinder head is much higher than that on the engine block during operation. The aforementioned circulating thermal management method cannot specifically adjust the cylinder head coolant temperature, resulting in the cylinder head not being adequately cooled under high load conditions. This leads to localized high temperatures, which in turn affect the engine's combustion efficiency and emissions performance, and shorten the engine's service life.

[0004] Therefore, how to achieve sufficient cooling of the cylinder head to ensure engine combustion efficiency and emission performance, thereby extending engine service life, has become a pressing technical problem to be solved in this field. Utility Model Content

[0005] The purpose of this invention is to at least solve the technical problem of how to achieve sufficient cooling of the cylinder head to ensure engine combustion efficiency and emission performance, thereby extending engine life. This purpose is achieved through the following technical solution:

[0006] In a first aspect, this utility model proposes an engine thermal management system, comprising: a water tank for supplying coolant; a water pump connected to the water tank via a first circuit; and a thermostat, wherein a first outlet of the thermostat is connected to the water pump via a first circulating water circuit, and a second outlet of the thermostat is connected to the water tank via a second circulating water circuit. The thermostat is configured to switch between a first state and a second state. In the first state, the temperature of the coolant flowing through the thermostat is lower than a first preset temperature value, the first circulating water circuit is in a connected state, and the second circulating water circuit is in a connected state. In the first state, the coolant is disconnected; in the second state, the temperature of the coolant flowing through the main thermostat is greater than or equal to a first preset temperature value, the first circulating water circuit is disconnected, and the second circulating water circuit is connected; the engine body has its inlet connected to the water pump via the first pump water circuit, and its outlet connected to the inlet of the main thermostat via the first branch, the first branch being configured to switch between the connected and disconnected states; and the cylinder head cooling assembly is connected between the water pump and the inlet of the main thermostat, and the cylinder head cooling assembly is arranged in parallel with the engine body.

[0007] In this engine thermal management system, when the engine is cold-started, the first branch is disconnected, and the main thermostat is in its first state. At this time, coolant in the radiator is pumped into the engine block and cylinder head cooling assembly by the water pump. Because the first branch is disconnected, the engine block does not experience cooling from the circulating coolant. Furthermore, since the cylinder head cooling assembly is connected in parallel with the engine block, the disconnection of the first branch does not affect the coolant circulation in the cylinder head cooling assembly. In other words, the engine cylinder head can be adequately cooled, thus ensuring engine combustion efficiency and emission performance, and consequently extending engine life. As the engine block temperature continues to rise, when cooling is needed, the first branch is switched back to the open state, allowing coolant to be delivered to the main thermostat through the first branch. The coolant then flows through the first circulation water circuit, ultimately achieving circulating cooling of the engine block. When the temperature of the coolant flowing through the master thermostat is greater than or equal to the first preset temperature value, it indicates that the water temperature flowing in the engine thermal management system is too high. Therefore, the master thermostat should be switched to the second state so that the coolant flowing through the master thermostat flows into the water tank. The cooled coolant then flows back to the water pump through the first circuit under the action of the water pump to achieve circulating cooling of the engine until the engine reaches thermal equilibrium.

[0008] In some embodiments of this utility model, the cylinder head cooling assembly includes: a lower cylinder head water jacket, the inlet of which is connected to a water pump via a second pump water circuit, and the outlet of which is connected to the inlet of the main thermostat; and an upper cylinder head water jacket, the inlet of which is connected to a water pump via a third pump water circuit, and the outlet of which is connected to the inlet of the main thermostat; wherein the first pump water circuit, the second pump water circuit, and the third pump water circuit are arranged in parallel.

[0009] In some embodiments of this utility model, a control device for controlling the on / off state of the first branch is provided on the first branch.

[0010] In some embodiments of this utility model, the control device includes a body thermostat, which is configured to switch between an open state and a closed state. When the body thermostat is in the closed state, the temperature of the coolant flowing through the body thermostat is less than a second preset temperature value, and the first branch is in the open state. When the body thermostat is in the open state, the temperature of the coolant flowing through the body thermostat is greater than or equal to the second preset temperature value, and the first branch is in the connected state.

[0011] In some embodiments of this utility model, the outlet of the lower water jacket of the cylinder head is connected to the inlet of the main thermostat via a second branch, and the outlet of the upper water jacket of the cylinder head is connected to the inlet of the main thermostat via a third branch.

[0012] In some embodiments of this utility model, the second branch is connected to the first branch, and the connection point between the second branch and the first branch is located between the control device and the main thermostat.

[0013] In some embodiments of this utility model, the third branch is connected to the first branch, and the connection point between the third branch and the first branch is located between the control device and the main thermostat.

[0014] In some embodiments of this utility model, the liquid inlet of the main thermostat includes a first port, a second port, and a third port, with the first branch connected to the first port, the second branch connected to the second port, and the third branch connected to the third port.

[0015] In some embodiments of this utility model, the outlet of the water jacket on the cylinder head is connected to a water pump through a second circuit. A heating device is provided on the second circuit to raise the temperature of the coolant flowing through the second circuit.

[0016] In some embodiments of this utility model, the second circuit is connected to the third branch.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 A schematic diagram of the connection relationship of an engine thermal management system provided for an embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of the connection relationship of another engine thermal management system provided in an embodiment of the present utility model.

[0021] The attached figures are labeled as follows:

[0022] 10. Engine thermal management system;

[0023] 100. Water tank;

[0024] 200. Water pump;

[0025] 300. Main thermostat;

[0026] 400. Engine body;

[0027] 500. Control device; 510. Body thermostat;

[0028] 600. Cylinder head cooling assembly; 610. Lower cylinder head water jacket; 620. Upper cylinder head water jacket;

[0029] 800. Heating device;

[0030] 911, First circuit; 912, Second circuit; 921, First circulating water circuit; 922, Second circulating water circuit; 930, Main pump water circuit; 931, First pump water circuit; 932, Second pump water circuit; 933, Third pump water circuit; 941, First branch circuit; 942, Second branch circuit; 943, Third branch circuit. Detailed Implementation

[0031] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0032] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0033] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0034] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0035] Figure 1 A schematic diagram of the connection relationship of an engine thermal management system provided for an embodiment of this utility model is shown below. Figure 1 As shown, this embodiment of the present invention provides an engine thermal management system 10, which includes: a water tank 100 for providing coolant; a water pump 200 connected to the water tank 100 via a first circuit 911; and a master thermostat 300, the first outlet of which is connected to the water pump 200 via a first circulating water path 921, and the second outlet of which is connected to the water tank 100 via a second circulating water path 922. The master thermostat 300 is configured to switch between a first state and a second state. In the first state, the temperature of the coolant flowing through the master thermostat 300 is lower than a first preset temperature value, the first circulating water path 921 is in a connected state, and the second circulating water path 922 is in a connected state. In the first state, the coolant is disconnected; in the second state, the temperature of the coolant flowing through the main thermostat 300 is greater than or equal to a first preset temperature value, the first circulating water path 921 is disconnected, and the second circulating water path 922 is connected; the engine body 400, the inlet of the engine body 400 is connected to the water pump 200 through the first pump water path 931, and the outlet of the engine body 400 is connected to the inlet of the main thermostat 300 through the first branch 941, the first branch 941 being configured to switch between the connected state and the disconnected state; and the cylinder head cooling assembly 600, connected between the water pump 200 and the inlet of the main thermostat 300, and the cylinder head cooling assembly 600 is arranged in parallel with the engine body 400.

[0036] In this embodiment, the working process of this engine thermal management system 10 is described in three cases below.

[0037] In the first scenario: when the engine is started cold, the first branch 941 is disconnected and the main thermostat 300 is in the first state. At this time, the coolant in the water tank 100 is pumped into the engine block 400 and the cylinder head cooling assembly 600 by the water pump 200. Since the first branch 941 is disconnected, the engine block 400 will not be cooled by the circulating coolant. Also, since the engine block 400 and the cylinder head cooling assembly 600 are connected in parallel, the disconnection of the first branch 941 will not affect the coolant circulation of the cylinder head cooling assembly, and the coolant will circulate and cool the cylinder head.

[0038] In other words, under these conditions, the engine cylinder head can be adequately cooled, thus ensuring the engine's combustion efficiency and emission performance, thereby extending the engine's service life. Furthermore, since there is no need to lower the temperature of the engine block 400, the oil inside the engine block 400 can be kept in a better viscosity state, reducing the friction between moving parts inside the engine block 400, saving fuel consumption, and also reducing the possibility of engine cylinder scoring.

[0039] The second scenario: As the temperature of the engine block 400 continues to rise, when it is necessary to cool the engine block 400, the first branch 941 is switched to the connected state, that is, the coolant can be delivered to the main thermostat 300 through the first branch 941, and then the coolant will flow through the first circulating water circuit 921 to finally achieve circulating cooling of the engine block 400.

[0040] In other words, in this situation, if the temperature of the engine body 400 needs to be reduced, simply switching the first branch 941 to the connected state will achieve cyclic cooling of the engine body 400.

[0041] The third scenario: When the temperature of the coolant flowing through the master thermostat 300 is greater than or equal to the first preset temperature value, it indicates that the water temperature flowing in the engine thermal management system 10 is too high. Therefore, the master thermostat 300 should be switched to the second state so that the coolant flowing through the master thermostat 300 flows into the water tank 100. After the coolant is cooled, it flows back to the water pump 200 through the first circuit 911 under the action of the water pump 200 to achieve circulating cooling of the engine until the engine reaches thermal equilibrium.

[0042] In other words, under these circumstances, the water temperature circulating in the engine thermal management system 10 is already too high. The primary task is to reduce the overall engine temperature. The most direct way to address this problem is to cool down the coolant circulating in the engine thermal management system 10. Therefore, the main thermostat 300 is switched to the second state so that the coolant flowing through the main thermostat 300 flows into the water tank 100. In this way, the overall temperature of the coolant that subsequently participates in the circulation will be effectively reduced, thereby improving the efficiency of the engine in reaching thermal equilibrium.

[0043] like Figure 1 As shown, according to an optional embodiment of the present invention, the cylinder head cooling assembly 600 includes: a lower cylinder head water jacket 610, the inlet of which is connected to a water pump 200 via a second pump water passage 932, and the outlet of which is connected to the inlet of a master thermostat 300; and an upper cylinder head water jacket 620, the inlet of which is connected to a water pump 200 via a third pump water passage 933, and the outlet of which is connected to the inlet of a master thermostat 300; wherein the first pump water passage 931, the second pump water passage 932, and the third pump water passage 933 are arranged in parallel.

[0044] In this embodiment, it is easy to understand that the engine thermal management system 10 may also include a master pump water passage 930. One end of the master pump water passage 930 is connected to the water pump 200, and the other end of the master pump water passage 930 is connected to the inlet of the water jacket 620 on the cylinder head through a third pump water passage 933. The first pump water passage 931 and the second pump water passage 932 may both be connected to the master pump water passage 930.

[0045] It should be noted that the above-mentioned parallel water circuit configuration is only for illustrative purposes. In actual working conditions, it should be based on the specific working requirements and is not restricted, as long as the first pump water circuit 931, the second pump water circuit 932, and the third pump water circuit 933 are ultimately connected in parallel.

[0046] refer to Figure 1 According to an optional embodiment of the present invention, a control device 500 for controlling the on / off state of the first branch 941 is provided on the first branch 941. The control device 500 includes a body thermostat 510, which is configured to switch between an open state and a closed state. When the body thermostat 510 is in the closed state, the temperature of the coolant flowing through the body thermostat 510 is less than a second preset temperature value, and the first branch 941 is in the open state. When the body thermostat 510 is in the open state, the temperature of the coolant flowing through the body thermostat 510 is greater than or equal to the second preset temperature value, and the first branch 941 is in the connected state.

[0047] In this embodiment, as can be seen from the above analysis, although the engine thermal management system 10 can achieve the goal of not cooling the engine body 400 in the cold start state, the temperature of the engine body 400 will gradually increase as the operation progresses, and cooling is also required. Therefore, setting the control device 500 to include the engine body thermostat 510 and setting a second preset temperature value is beneficial to improving the efficiency of controlling the on / off state of the first branch 941, thereby improving the overall working efficiency of the engine thermal management system 10.

[0048] Specifically, the first preset temperature value ranges from 95℃ to 98℃; the second preset temperature value ranges from 80℃ to 90℃. It should be noted that this is only a specific description of the range of the first and second preset temperature values. In actual working conditions, the specific working conditions should be taken into account, and no restrictions are imposed.

[0049] The following describes in more detail the working process of the engine thermal management system 10 in this embodiment, taking the first preset temperature value of 98℃ and the second preset temperature value of 80℃ as examples, in conjunction with the above three situations.

[0050] In the first scenario: when the engine is started cold, the temperature of the coolant flowing through the engine block thermostat 510 is necessarily less than 80°C, and the temperature of the coolant flowing through the main thermostat 300 is also necessarily less than 98°C. Therefore, the engine block thermostat 510 is closed, and the main thermostat 300 is in the first state. At this time, the coolant in the water tank 100 is pumped into the first pump water passage 931, the second pump water passage 932, and the third pump water passage 933 by the water pump 200. Since the first branch 941 is disconnected, the engine block 400 will not be cooled by the circulating coolant. The coolant flowing through the second pump water passage 932 and the third pump water passage 933 will flow through the lower cylinder head water jacket 610 and the upper cylinder head water jacket 620, respectively, and then through the main thermostat 300, before flowing back to the water pump 200 through the first circulating water passage 921 (similar to the "small circulation" commonly referred to in the industry), thus completing the circulating cooling of the engine cylinder head.

[0051] The second scenario: As the temperature of the engine block 400 continues to rise, when the temperature of the coolant flowing through the engine block thermostat 510 reaches 80°C and the temperature of the coolant flowing through the main thermostat 300 is less than 98°C, it indicates that the temperature of the engine block 400 is too high and needs to be cooled down, and the main thermostat 300 is in the first state. At this time, the engine block thermostat 510 switches to the open state, allowing the coolant flowing through the engine block thermostat 510 to be delivered to the main thermostat 300 through the first branch 941. Then the coolant will flow through the first circulating water path 921 (again, it is still a "small circulation" at this time) to finally achieve circulating cooling of the engine block 400.

[0052] The third scenario: When the temperature of the coolant flowing through the master thermostat 300 is greater than or equal to 98°C, it indicates that the water temperature flowing in the engine thermal management system 10 is too high. Therefore, at this time, the master thermostat 300 switches to the second state so that the coolant flowing through the master thermostat 300 flows into the water tank 100. The cooled coolant then flows back to the water pump 200 through the first circuit 911 under the action of the water pump 200 (similar to the "large circulation" often mentioned in the industry) to achieve circulating cooling of the engine until the engine reaches thermal equilibrium.

[0053] Continue to refer to Figure 1 According to an optional embodiment of the present invention, the outlet of the lower cylinder head water jacket 610 is connected to the inlet of the main thermostat 300 through the second branch 942, and the outlet of the upper cylinder head water jacket 620 is connected to the inlet of the main thermostat 300 through the third branch 943.

[0054] Specifically, the connection relationship between the first branch 941, the second branch 942, and the third branch 943 will be described below using a specific embodiment as an example.

[0055] like Figure 1 As shown, the first connection relationship is as follows: According to an optional embodiment of this utility model, the second branch 942 is connected to the first branch 941, and the connection point between the second branch 942 and the first branch 941 is located between the control device 500 and the main thermostat 300. The third branch 943 is connected to the first branch 941, and the connection point between the third branch 943 and the first branch 941 is located between the control device 500 and the main thermostat 300.

[0056] In this embodiment, the coolant flowing through the cylinder head lower water jacket 610 and the cylinder head lower water jacket 610 will eventually be collected by the second branch 942 and the third branch 943 respectively and then combined with the first branch 941. The collected coolant will then flow into the main thermostat 300 through the inlet of the main thermostat 300.

[0057] The second connection relationship (not shown in the attached drawings) is as follows: According to an optional embodiment of the present invention, the liquid inlet of the main thermostat 300 includes a first port, a second port and a third port, a first branch 941 is connected to the first port, a second branch 942 is connected to the second port, and a third branch 943 is connected to the third port.

[0058] In this embodiment, the first branch 941, the second branch 942 and the third branch 943 are connected in parallel, which can also achieve the final flow of coolant into the main thermostat 300.

[0059] It is easy to understand that the connection relationships of the two types of first branch 941, second branch 942 and third branch 943 mentioned above are only illustrative examples. In actual working conditions, the specific working conditions should be taken into account, as long as the temperature of the cylinder head of the engine can be adjusted independently relative to the engine body 400. No specific restrictions are imposed.

[0060] Figure 2 A schematic diagram of the connection relationship of another engine thermal management system provided in this embodiment of the present invention is shown below. Figure 2 As shown, according to an optional embodiment of the present invention, the outlet of the water jacket 620 on the cylinder head is connected to the water pump 200 through the second circuit 912. The second circuit 912 is provided with a heating device 800, which is used to raise the temperature of the coolant flowing through the second circuit 912.

[0061] In this embodiment, it is easy to understand that, based on the fact that the engine thermal management system 10 can fully cool the engine cylinder head, if the need to increase the temperature of the engine body 400 or the cylinder head is taken into account, the function of the engine thermal management system 10 will be further improved to be suitable for more application scenarios.

[0062] Therefore, in this embodiment, a heating device 800 is provided on the second circuit 912. The coolant heated by the heating device 800 flows back to the water pump 200 through the second circuit 912. In the new cycle, the coolant becomes hotter, so as to increase the temperature of the engine body 400 or cylinder head.

[0063] It is easy to understand that the heating device 800 is only turned on when it is necessary to raise the temperature of the engine block 400 or cylinder head; when it is only necessary to circulate cooling to cool the engine, the heating device 800 should be kept off.

[0064] Continue to refer to Figure 2 According to an optional embodiment of the present invention, the second circuit 912 is connected to the third branch 943.

[0065] In this embodiment, it is easy to understand that, given that the engine thermal management system 10 includes a third branch 943, the second circuit 912 can be connected to the third branch 943, making the operation simple and convenient.

[0066] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An engine thermal management system, characterized in that, include: Water tank (100) for supplying coolant; A water pump (200) is connected to the water tank (100) via a first circuit (911); A master thermostat (300) is provided, wherein the first outlet of the master thermostat (300) is connected to the water pump (200) through a first circulating water passage (921), and the second outlet of the master thermostat (300) is connected to the water tank (100) through a second circulating water passage (922); the master thermostat (300) is configured to switch between a first state and a second state, wherein in the first state, the temperature of the coolant flowing through the master thermostat (300) is less than a first preset temperature value, the first circulating water passage (921) is in a connected state, and the second circulating water passage (922) is in a disconnected state; In the second state, the temperature of the coolant flowing through the main thermostat (300) is greater than or equal to the first preset temperature value, the first circulating water circuit (921) is in the disconnected state, and the second circulating water circuit (922) is in the connected state. An engine body (400) has its inlet connected to a water pump (200) via a first pump water passage (931), and its outlet connected to the inlet of a master thermostat (300) via a first branch (941), the first branch (941) being configured to switch between a connected state and a disconnected state. as well as The cylinder head cooling assembly (600) is connected between the water pump (200) and the inlet of the main thermostat (300), and the cylinder head cooling assembly (600) is arranged in parallel with the engine body (400).

2. The engine thermal management system according to claim 1, characterized in that, The cylinder head cooling assembly includes: A cylinder head lower water jacket (610), the inlet of which is connected to the water pump (200) via a second pump water passage (932), and the outlet of which is connected to the inlet of the main thermostat (300); and A water jacket (620) on the cylinder head, the inlet of the water jacket (620) on the cylinder head is connected to the water pump (200) through the third pump water passage (933), and the outlet of the water jacket (620) on the cylinder head is connected to the inlet of the main thermostat (300); The first pump water path (931), the second pump water path (932), and the third pump water path (933) are connected in parallel.

3. The engine thermal management system according to claim 2, characterized in that, The first branch (941) is provided with a control device (500) for controlling the on / off state of the first branch (941).

4. The engine thermal management system according to claim 3, characterized in that, The control device (500) includes a body thermostat (510) configured to switch between an on state and a off state; When the body thermostat (510) is in the closed state, the temperature of the coolant flowing through the body thermostat (510) is less than the second preset temperature value, and the first branch (941) is in the disconnected state. When the body thermostat (510) is in the open state, the temperature of the coolant flowing through the body thermostat (510) is greater than or equal to the second preset temperature value, and the first branch (941) is in the connected state.

5. The engine thermal management system according to claim 3, characterized in that, The outlet of the lower cylinder head water jacket (610) is connected to the inlet of the main thermostat (300) via a second branch (942), and the outlet of the upper cylinder head water jacket (620) is connected to the inlet of the main thermostat (300) via a third branch (943).

6. The engine thermal management system according to claim 5, characterized in that, The second branch (942) is connected to the first branch (941), and the connection point between the second branch (942) and the first branch (941) is located between the control device (500) and the main thermostat (300).

7. The engine thermal management system according to claim 5, characterized in that, The third branch (943) is connected to the first branch (941), and the connection point between the third branch (943) and the first branch (941) is located between the control device (500) and the main thermostat (300).

8. The engine thermal management system according to claim 5, characterized in that, The liquid inlet of the main thermostat (300) includes a first port, a second port and a third port. The first branch (941) is connected to the first port, the second branch (942) is connected to the second port, and the third branch (943) is connected to the third port.

9. The engine thermal management system according to any one of claims 5-8, characterized in that, The outlet of the water jacket (620) on the cylinder head is connected to the water pump (200) through the second circuit (912). The second circuit (912) is equipped with a heating device (800) for raising the temperature of the coolant flowing through the second circuit (912).

10. The engine thermal management system according to claim 9, characterized in that, The second circuit (912) is connected to the third branch (943).

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