Engine cooling system and engine temperature adjusting method

Abstract

The invention relates to the technical field of engines, in particular to an engine cooling system and an engine temperature adjusting method. The engine cooling system comprises a water pump, an engine body, a radiator, an engine oil pump and an engine oil cooler of a double-branch structure, the engine oil cooler comprises a first branch and a second branch, and the first branch and the second branch are used for heat exchange; wherein the water pump and the engine body are communicated with each other to form a first waterway circulation path; the water pump, the engine body, the radiator and the first branch are sequentially communicated end to end to form a second waterway circulation path; the oil pump, the engine body and the second branch are sequentially communicated end to end to form an oil way circulation path. The engine cooling system can improve the cooling efficiency of the engine.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and more specifically, to an engine cooling system and an engine temperature regulation method. Background Technology

[0002] As the core power unit of modern transportation and industrial equipment, the engine generates significant heat accumulation during operation. Failure to achieve timely and effective thermal management will lead to abnormally high engine temperatures, which in turn triggers a series of chain reactions such as thermal deformation of metal components and degradation of lubricating medium performance, ultimately severely impacting the engine's operating efficiency and service life.

[0003] However, existing technologies suffer from low cooling efficiency. Summary of the Invention

[0004] The present invention aims to provide an engine cooling system and an engine temperature regulation method that can improve the cooling efficiency of the engine.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides an engine cooling system, which includes a water pump, an engine body, a radiator, an oil pump, and a dual-branch oil cooler. The oil cooler includes a first branch and a second branch, which are used for heat exchange. The water pump and the engine body are interconnected to form a first water circulation path; the water pump, engine body, radiator and the first branch are connected end to end to form a second water circulation path; the oil pump, engine body and the second branch are connected end to end to form an oil circulation path.

[0006] In an optional implementation, the engine cooling system further includes a water circuit regulator and an oil circuit regulator; The engine block, water circuit regulator, and radiator are connected in sequence, as are the engine block, oil circuit regulator, and oil cooler.

[0007] In an optional embodiment, the engine cooling system further includes a water temperature sensor, which is located on the fluid line between the engine body and the water line regulator.

[0008] In an optional embodiment, the engine cooling system further includes a first multi-way connecting pipe and a second multi-way connecting pipe, which are interconnected; the engine body and the radiator are connected through the first multi-way connecting pipe; and the water pump and the first branch are connected through the second multi-way connecting pipe.

[0009] Secondly, the present invention provides an engine temperature regulation method, which is implemented through the aforementioned engine cooling system, and includes: Obtain the coolant temperature at the engine block outlet; If the following conditions are met: coolant temperature < first preset temperature threshold, then the water circuit regulator and the oil circuit regulator are closed, thereby cutting off the second water circuit circulation path and the oil circuit circulation path, and opening the first water circuit circulation path. If the following conditions are met: first preset temperature threshold ≤ coolant temperature < second preset temperature threshold, then the water circuit regulator is opened and the oil circuit regulator is closed, so that both the first water circuit circulation path and the second water circuit circulation path are connected, and the oil circuit circulation path is cut off. If the following condition is met: the second preset temperature threshold is less than or equal to the coolant temperature, both the water circuit regulator and the oil circuit regulator are opened, so that the first water circuit circulation path, the second water circuit circulation path, and the oil circuit circulation path are all connected.

[0010] In an optional embodiment, the water circuit regulator has a first coolant setting and a second coolant setting, and the water circuit regulator is configured to allow a greater flow rate of liquid when it is in the second coolant setting than when it is in the first coolant setting. If the following conditions are met: first preset temperature threshold ≤ coolant temperature < second preset temperature threshold, then the water circuit regulator is opened and the oil circuit regulator is closed, so that both the first and second water circuit circulation paths are connected, and the oil circuit circulation path is cut off. The steps include: If the following conditions are met: first preset temperature threshold ≤ coolant temperature < third preset temperature threshold, then the water circuit regulator is controlled to be in the first coolant setting. If the following conditions are met: the third preset temperature threshold ≤ coolant temperature < the second preset temperature threshold, then the water circuit regulator is set to the second coolant setting.

[0011] In an optional embodiment, the oil circuit regulator has a first oil setting and a second oil setting, and the oil circuit regulator is configured to allow a greater flow rate of fluid when it is in the second oil setting than when it is in the first oil setting. If the condition is met: the second preset temperature threshold ≤ coolant temperature, the steps to open both the water circuit regulator and the oil circuit regulator, ensuring that the first water circuit circulation path, the second water circuit circulation path, and the oil circuit circulation path are all open, include: If the following conditions are met: the second preset temperature threshold ≤ coolant temperature < the fourth preset temperature threshold, then the oil circuit regulator is set to the first oil setting. If the fourth preset temperature threshold is less than the coolant temperature, then the oil circuit regulator is set to the second oil setting.

[0012] In an optional implementation, the first preset temperature threshold is 82°C and the second preset temperature threshold is 95°C.

[0013] In an optional implementation, the third preset temperature threshold is 90°C.

[0014] In an optional implementation, the fourth preset temperature threshold is 105°C.

[0015] The beneficial effects of the engine cooling system and engine temperature regulation method provided in the embodiments of the present invention include: This engine cooling system features a dual-branch oil cooler, with the first branch of the radiator and oil cooler connected in series in the second water circulation path. This allows the coolant to be cooled by the radiator before entering the oil cooler to act as a cold source for secondary cooling of the high-temperature oil. This fully utilizes the "residual cooling capacity" of the coolant, improves the oil cooling efficiency, achieves tiered utilization of heat, and maximizes the heat dissipation potential of the cooling system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the engine cooling system provided in this embodiment; Figure 2 This is a schematic diagram of the structure of the first water circulation loop and the second water circulation loop provided in this embodiment; Figure 3 This is a schematic diagram of the oil circulation loop provided in this embodiment; Figure 4 This is a flowchart illustrating the engine temperature regulation method provided in this embodiment; Figure 5 for Figure 4 A flowchart of the S22 process; Figure 6 for Figure 4 A flowchart of S23.

[0018] Icons: 100-Engine cooling system; 110-Water pump; 120-Engine body; 130-Radiator; 140-Oil pump; 150-Oil cooler; 151-First branch; 152-Second branch; 160-Water circuit regulator; 170-Oil circuit regulator; 180-Water temperature sensor; 190-Multi-port connector assembly; 191-First multi-port connector; 192-Second multi-port connector; 210-Heater core; 220-EGR cooler; 230-Turbocharger; 240-Expansion tank. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0025] Please refer to Figures 1-3The present invention provides an engine cooling system 100, which includes a water pump 110, an engine body 120, a radiator 130, an oil pump 140, and a dual-branch oil cooler 150. The oil cooler 150 includes a first branch 151 and a second branch 152, which are used for heat exchange.

[0026] Specifically, the outlet of the water pump 110 is connected to the coolant inlet of the engine body 120 through a pipe, and the coolant outlet of the engine body 120 is also connected back to the inlet of the water pump 110 through a pipe, forming a closed loop including the water pump 110 and the engine body 120, constituting the first water circulation path.

[0027] The engine cooling system 100 also includes a second water circulation loop and an oil circulation loop. The second water circulation loop includes a first branch 151 that connects the water pump 110, engine body 120, radiator 130 and oil cooler 150 in sequence. The oil circulation loop includes a second branch 152 that connects the oil pump 140, engine body 120 and oil cooler 150 in sequence.

[0028] Understandably, the oil cooler 150 adopts a dual-branch parallel, physically isolated but common-wall heat exchange design structure. The first branch 151 is dedicated to the flow of coolant, and the second branch 152 is dedicated to the flow of engine oil. The two branches are separated by a heat-conducting metal partition, and the two media cannot flow into each other's branches, thus preventing the media from mixing. However, heat can be transferred between them, thereby achieving safe and efficient heat exchange between coolant and engine oil.

[0029] Therefore, this cooling system connects the radiator 130 and the oil cooler 150 in series in the second water circulation path. The high-temperature coolant from the engine block 120 first flows through the radiator 130, where it undergoes initial cooling after heat exchange with the outside air. Subsequently, the cooled coolant enters the first branch 151 of the oil cooler 150, where it acts as a cold source for indirect heat exchange with the high-temperature engine oil in the second branch 152. Since the coolant temperature is still lower than the engine oil temperature, it retains effective heat absorption capacity, i.e., "residual cooling capacity," for secondary cooling of the engine oil. This not only avoids wasting cooling resources but also improves the efficiency of oil cooling and the overall thermal management performance of the system.

[0030] It should be noted that the engine cooling system 100 also includes a multi-way connecting pipe assembly 190 to achieve coolant diversion. Specifically, in this embodiment, the multi-way connecting pipe assembly 190 includes at least a first multi-way connecting pipe 191 and a second multi-way connecting pipe 192. The engine body 120 and the radiator 130 are connected through the first multi-way connecting pipe 191; the water pump 110 and the first branch 151 are connected through the second multi-way connecting pipe 192, so that the coolant flowing out of the outlet of the engine body 120 can flow into the radiator 130 and the first branch 151 through the first multi-way connecting pipe 191, and then flow back into the water pump 110 through the second multi-way connecting pipe 192.

[0031] The first multi-way connecting pipe 191 is also connected to the second multi-way connecting pipe 192, so that some coolant flows directly into the water pump 110 without passing through the radiator 130 and the oil cooler 150. Thus, this embodiment achieves the diversion of cooling and the collection of coolant from different branches by setting up multi-way connecting pipes, so that some coolant can flow in the first water circulation loop and other coolant can flow in the second water circulation loop.

[0032] In this embodiment, the engine body 120 includes a cylinder block and a cylinder head. After the coolant flows out from the water pump 110, it first flows through the cylinder block, then through the cylinder head, and then flows into the multi-way connecting pipe to enter the branch circuit.

[0033] Furthermore, the engine achieves its highest combustion efficiency, lowest mechanical loss, and optimal emission performance when operating within a specific temperature range; this temperature range is the engine's optimal operating temperature range. To ensure the engine quickly enters and stably operates within this temperature range, this embodiment includes a water circuit regulator 160 and an oil circuit regulator 170. By controlling the conduction states of the second water circuit circulation loop and the oil circuit circulation loop respectively, the on / off state of the second water circuit circulation loop and the oil circuit circulation loop can be controlled separately, achieving graded regulation of the cooling system's heat dissipation capacity and ensuring the engine is always in a state of high-efficiency power output.

[0034] Specifically, the engine body 120, water circuit regulator 160 and radiator 130 are connected in sequence, and the engine body 120, oil circuit regulator 170 and oil cooler 150 are connected in sequence.

[0035] It should be noted that when the engine temperature reaches the first preset temperature threshold, the water circuit regulator 160 is turned on; when the engine temperature reaches the second preset temperature threshold, the oil circuit regulator 170 is turned on. The first preset temperature threshold is the lower limit of the engine's optimal operating temperature range; while the second preset temperature is not the upper limit of the optimal operating range, but rather an intermediate value within that temperature range.

[0036] When the engine temperature does not reach the first preset temperature threshold, it indicates that the engine temperature is too low and the engine is in a cold start or low-temperature operation state. At this time, both the water circuit regulator 160 and the oil circuit regulator 170 are closed, causing the second water circuit circulation loop and the oil circuit circulation loop to be disconnected, with only the first water circuit circulation loop being open. In this mode, the coolant circulates within a small range between the water pump 110 and the engine block 120, without flowing through the radiator 130 and the oil cooler 150, effectively reducing heat loss, thereby accelerating the warm-up rate of the engine block 120 and the coolant, shortening the warm-up time, and helping to reduce cold start emissions.

[0037] When the engine temperature reaches or exceeds the first preset temperature threshold, but does not reach the second preset temperature threshold, it indicates that the engine has entered the optimal operating temperature range, but has not yet faced the risk of overheating, i.e., it is in a medium-load operating condition. At this time, the water circuit regulator 160 is in the open state, while the oil circuit regulator 170 is in the closed state, so the first water circuit circulation loop and the second water circuit circulation loop are connected, and the oil circuit circulation loop is disconnected.

[0038] Since the second water circulation loop connects the radiator 130 and the first branch 151 of the oil cooler 150 in series, the coolant can flow through the radiator 130 for external heat dissipation and enter the first branch 151 of the oil cooler 150 in sequence; while the oil circulation loop is not connected, the high-temperature oil does not enter the second branch 152 of the oil cooler 150. Therefore, although the coolant flows through the oil cooler 150, no heat exchange occurs between the two, thereby achieving moderate cooling of the engine body 120 and avoiding excessive cooling of the oil, which is conducive to maintaining its good fluidity and lubrication performance.

[0039] When the engine temperature reaches or exceeds the second preset temperature, it indicates that the engine is under high load or continuous high-speed operation, posing a risk of overheating. At this time, both the water circuit regulator 160 and the oil circuit regulator 170 are in the open state, so the first water circuit circulation loop, the second water circuit circulation loop, and the oil circuit circulation loop are all connected, thereby utilizing the residual cooling capacity to perform heat exchange on the oil in the oil cooler 150, improving cooling efficiency.

[0040] Understandably, the water circuit regulator 160 is used to control the opening and closing of the second water circuit circulation loop, and whether or not the second water circuit circulation loop is open determines whether the cooling system starts to release heat to the external environment, that is, whether the active heat dissipation process is initiated. The oil circuit regulator 170 is used to control the opening and closing of the oil circuit circulation loop, and whether or not the oil circuit circulation loop is open determines whether the engine oil participates in heat exchange.

[0041] Therefore, this embodiment achieves graded regulation of the cooling system by independently controlling the water circuit regulator 160 and the oil circuit regulator 170, combined with the real-time temperature changes of the engine. When the engine is in the medium-low temperature stage, the second water circuit circulation can be activated to cool the engine body while keeping the oil circuit circulation disconnected to avoid excessive cooling of the engine oil and ensure its good fluidity and lubrication performance. In the high temperature stage, both circulations can be activated simultaneously to improve cooling efficiency by utilizing the residual cooling capacity of the coolant.

[0042] To ensure the engine always receives basic cooling and prevent risks such as localized overheating or lubrication failure due to interrupted circulation, the first water circulation loop remains open regardless of engine operating temperature variations. This loop constitutes the baseline circulation path of the cooling system, meaning the coolant must continuously flow through the engine's 120mm water jacket to perform the most basic heat removal function. Subsequent second water circulation loops and oil circulation loops are extensions and enhancements built upon this foundation, rather than replacements.

[0043] Based on the above, the engine cooling system 100 also includes a water temperature sensor 180, which is installed on the fluid passage between the engine body 120 and the water circuit regulator 160. It can be understood that this embodiment indirectly reflects the actual operating temperature of the engine by detecting the temperature of the coolant at the outlet of the engine body 120, thereby providing a basis for thermal management control.

[0044] Both the water circuit regulator 160 and the oil circuit regulator 170 are controlled by a controller (such as an electronic control unit, ECU). After the water temperature sensor 180 collects the real-time temperature of the coolant, it transmits the temperature signal to the controller. The controller receives and processes the signal, determines the current operating condition based on a preset temperature threshold, and sends control commands to the water circuit regulator 160 and the oil circuit regulator 170 accordingly to achieve precise control of their opening or closing.

[0045] The present invention also provides an engine temperature regulation method implemented by the aforementioned engine cooling system 100. This method achieves graded regulation of the cooling system by real-time monitoring of the coolant temperature and, in conjunction with preset multi-level temperature thresholds, controlling the operating states of the water circuit regulator 160 and the oil circuit regulator 170.

[0046] Please refer to Figure 4 The specific steps of this method include: S1: Obtain the coolant temperature at the engine body's 120mm outlet.

[0047] S21: If the coolant temperature is less than the first preset temperature threshold, then the water circuit regulator 160 and the oil circuit regulator 170 are closed, thereby cutting off the second water circuit circulation path and the oil circuit circulation path, and opening the first water circuit circulation path.

[0048] S22: If the following conditions are met: first preset temperature threshold ≤ coolant temperature < second preset temperature threshold, then control the water circuit regulator 160 to open and the oil circuit regulator 170 to close, so that both the first water circuit circulation path and the second water circuit circulation path are connected, and the oil circuit circulation path is cut off.

[0049] S23: If the second preset temperature threshold is less than or equal to the coolant temperature, then both the water circuit regulator 160 and the oil circuit regulator 170 are opened, so that the first water circuit circulation path, the second water circuit circulation path and the oil circuit circulation path are all connected.

[0050] It should be noted that in this embodiment, the first preset temperature threshold is 82°C and the second preset temperature threshold is 95°C, that is, the lower limit of the optimal temperature range for engine operation is 82°C.

[0051] In this embodiment, the second water circulation path adopts a structure design that connects the radiator 130 and the first branch 151 of the oil cooler 150 in series, providing a physical basis for the cascade heat exchange of the coolant. Simultaneously, by setting up a water circuit regulator 160 and an oil circuit regulator 170, and combining temperature feedback for graded control, the phased use of this series path is achieved. Specifically, when the engine is under medium load, only the radiator 130 is used for engine cooling; while when the engine is under high load, the coolant first undergoes preliminary cooling through the radiator 130 and the outside air, retaining a certain "residual cooling capacity," which can then be used as a cold source in the oil cooler 150 to perform secondary cooling of the high-temperature oil, improving cooling efficiency and maximizing the heat dissipation potential of the cooling system.

[0052] Furthermore, the water circuit regulator 160 has two flow control positions: a first coolant position and a second coolant position. When the water circuit regulator 160 is in the first coolant position, its internal valve is partially open (half-open state), allowing a limited flow of coolant. When it is in the second coolant position, the valve is fully open (fully open state), maximizing the flow area and achieving a higher coolant flow rate. This graded flow regulation mechanism enables the system to dynamically match the heat dissipation intensity according to the actual heat load of the engine, avoiding sudden changes in cylinder block thermal stress caused by a sudden increase in cooling capacity.

[0053] In this embodiment, the water circuit regulator 160 adopts an electric throttle valve structure driven by a controller, and its opening degree can be precisely controlled according to the received temperature signal. Specifically, when the engine enters a medium load condition, the controller controls the flow level of the water circuit regulator 160 in stages based on the real-time temperature data fed back by the water temperature sensor 180.

[0054] Accordingly, please refer to Figure 5The aforementioned step S22 includes: S221: If the following conditions are met: first preset temperature threshold ≤ coolant temperature < third preset temperature threshold, then control the water circuit regulator 160 to be in the first coolant position (valve half open).

[0055] At this time, the second water circulation path is opened, and the coolant begins to flow through the radiator 130 and the first branch 151 of the oil cooler 150 to dissipate heat. However, the flow rate is limited to achieve a smooth transition and prevent the engine temperature from dropping suddenly.

[0056] S222: If the following conditions are met: the third preset temperature threshold ≤ coolant temperature < the second preset temperature threshold, then control the water circuit regulator 160 to be in the second coolant position (valve fully open).

[0057] At this point, the coolant flow rate increases significantly, thereby improving heat dissipation efficiency and enhancing the cooling system's ability to dissipate heat from the coolant.

[0058] In this embodiment, the oil circuit regulator 170 is also equipped with a first oil level and a second oil level to regulate the flow of oil into the oil cooler 150. When the oil circuit regulator 170 is in the first oil level position, its valve is partially open (half-open state), limiting the oil flow, which is suitable for moderate cooling in the medium and high temperature stages; when it is in the second oil level position, the valve is fully open (fully open state), allowing the high-temperature oil to flow fully into the second branch 152 of the oil cooler 150, improving the heat exchange efficiency.

[0059] Specifically, the oil circuit regulator 170 also adopts an electric throttle valve structure driven by the controller, and its opening degree can be precisely controlled according to the received temperature signal. When the engine enters a high-load condition, the controller controls the flow level of the oil circuit regulator 170 in stages based on the real-time temperature data fed back by the water temperature sensor 180.

[0060] Accordingly, please refer to Figure 6 The aforementioned step S23 includes: S231: If the following conditions are met: the second preset temperature threshold ≤ coolant temperature < the fourth preset temperature threshold, then the control oil circuit regulator 170 is in the first oil position (valve half open).

[0061] At this time, some of the high-temperature engine oil enters the oil cooler 150 for cooling, to prevent the oil viscosity from changing drastically due to a sudden and significant drop in temperature, which would affect the lubrication performance.

[0062] S232: If the fourth preset temperature threshold is less than the coolant temperature, then the oil circuit regulator 170 is in the second oil position (valve fully open).

[0063] At this point, the oil flow rate is increased significantly to suppress further rise in oil temperature and prevent risks of failure such as oil oxidation and deterioration, foaming, or oil film rupture.

[0064] It should be noted that in this embodiment, the third preset temperature threshold is 90℃, and the fourth preset temperature threshold is 105℃. The fifth preset temperature threshold is the upper limit of the engine's optimal temperature range, so its upper limit is 105℃. Therefore, the optimal operating temperature range of the engine is 85℃-105℃.

[0065] In other embodiments, the optimal temperature range for engine operation may be adjusted according to actual conditions, and therefore the values ​​of the first preset temperature threshold, the second preset temperature threshold, the third preset temperature threshold, and the fourth preset temperature threshold may also be adjusted.

[0066] Further, please refer to Figure 1 In this embodiment, in addition to the aforementioned first and second water circulation loops, the engine cooling system 100 also integrates other cooling branches between the water pump 110 and the engine body 120. For example, a heating branch is provided to the heater core 210 to utilize the engine's waste heat to provide a heat source for the air conditioning system; a cooling branch is provided to the EGR cooler 220 to reduce the temperature of the recirculated exhaust gas to improve emission performance; and a cooling branch is also provided to the turbocharger 230 to achieve temperature control of its high-temperature components.

[0067] In addition, the system is connected to the high point of the cooling circuit via the expansion tank 240, forming a liquid replenishment and venting channel to ensure system operational stability and sealing reliability. All branches are powered by the main water pump 110, which automatically distributes the flow rate according to the pressure difference at the location, and can be adjusted via a throttle valve when necessary.

[0068] In summary, the engine cooling system 100 provided in this embodiment sets up a dual-branch oil cooler 150, and connects the radiator 130 and the first branch 151 of the oil cooler 150 in series in the second water circulation path. This allows the coolant to be cooled by the radiator 130 before entering the oil cooler 150 as a cold source to perform secondary cooling on the high-temperature oil. This fully utilizes the "residual cooling capacity" of the coolant, improves the oil cooling efficiency, realizes the cascade utilization of heat, and maximizes the heat dissipation potential of the cooling system.

[0069] Meanwhile, this embodiment achieves graded control of the cooling system by independently configuring the water circuit regulator 160 and the oil circuit regulator 170, combined with the real-time temperature feedback from the water temperature sensor 180: when the engine is in cold start condition, only the first water circuit small circulation is opened to speed up warm-up; when the engine is in medium load condition, the water circuit is opened to cool the engine body 120, but the oil circuit is disconnected to avoid excessive cooling of the engine oil; when the engine is in high load condition, the oil circuit and water circuit are opened simultaneously to achieve synchronous cooling of the engine body 120 and the engine oil.

[0070] In addition, both the water circuit regulator 160 and the oil circuit regulator 170 have multiple flow levels, which can adjust the flow of the cooling medium according to temperature changes to achieve a smooth transition, avoid excessive temperature changes in the coolant or engine oil, and ensure the lubrication performance, combustion efficiency and service life of the engine under various operating conditions.

[0071] 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 that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An engine cooling system, characterized in that, The engine cooling system (100) includes a water pump (110), an engine body (120), a radiator (130), an oil pump (140), and a dual-branch oil cooler (150). The oil cooler (150) includes a first branch (151) and a second branch (152), which are used for heat exchange. The water pump (110) is interconnected with the engine body (120) to form a first water circulation path; the water pump (110), engine body (120), radiator (130) and the first branch (151) are connected end to end in sequence to form a second water circulation path; the oil pump (140), engine body (120) and the second branch (152) are connected end to end in sequence to form an oil circulation path.

2. The engine cooling system according to claim 1, characterized in that, The engine cooling system (100) also includes a water circuit regulator (160) and an oil circuit regulator (170). The engine body (120), the water circuit regulator (160) and the radiator (130) are connected in sequence, and the engine body (120), the oil circuit regulator (170) and the oil cooler (150) are connected in sequence.

3. The engine cooling system according to claim 2, characterized in that, The engine cooling system (100) also includes a water temperature sensor (180), which is located on the liquid line between the engine body (120) and the water line regulator (160).

4. The engine cooling system according to claim 2, characterized in that, The engine cooling system (100) further includes a first multi-way connecting pipe (191) and a second multi-way connecting pipe (192), which are interconnected; the engine body (120) and the radiator (130) are connected through the first multi-way connecting pipe (191); the water pump (110) and the first branch (151) are connected through the second multi-way connecting pipe (192).

5. An engine temperature regulation method, wherein the engine temperature regulation method is implemented by the engine cooling system (100) according to any one of claims 2-4, characterized in that, The engine temperature regulation method includes: Obtain the coolant temperature at the outlet of the engine body (120); If the following conditions are met: the coolant temperature is less than the first preset temperature threshold, then the water circuit regulator (160) and the oil circuit regulator (170) are controlled to close, thereby cutting off the second water circuit circulation path and the oil circuit circulation path, and opening the first water circuit circulation path. If the following conditions are met: the first preset temperature threshold ≤ the coolant temperature < the second preset temperature threshold, then the water circuit regulator (160) is opened and the oil circuit regulator (170) is closed, so that the first water circuit circulation path and the second water circuit circulation path are both connected, and the oil circuit circulation path is cut off. If the following condition is met: the second preset temperature threshold is less than or equal to the coolant temperature, the water circuit regulator (160) and the oil circuit regulator (170) are both opened, so that the first water circuit circulation path, the second water circuit circulation path and the oil circuit circulation path are all connected.

6. The engine temperature regulation method according to claim 5, characterized in that, The water circuit regulator (160) has a first coolant setting and a second coolant setting, and the water circuit regulator (160) is used to allow a greater flow rate of liquid when it is in the second coolant setting than when it is in the first coolant setting. If the following conditions are met: the first preset temperature threshold ≤ the coolant temperature < the second preset temperature threshold, then the water circuit regulator (160) is opened and the oil circuit regulator (170) is closed, so that both the first water circuit circulation path and the second water circuit circulation path are connected, and the oil circuit circulation path is cut off, the step of which includes: If the following conditions are met: the first preset temperature threshold ≤ the coolant temperature < the third preset temperature threshold, then the water circuit regulator (160) is controlled to be in the first coolant setting; If the following conditions are met: the third preset temperature threshold ≤ the coolant temperature < the second preset temperature threshold, then the water circuit regulator (160) is controlled to be in the second coolant setting.

7. The engine temperature regulation method according to claim 5, characterized in that, The oil circuit regulator (170) has a first oil setting and a second oil setting, and the oil circuit regulator (170) is used to allow a greater flow rate of liquid when it is in the second oil setting than when it is in the first oil setting. The step of controlling both the water circuit regulator (160) and the oil circuit regulator (170) to open, so that the first water circuit circulation path, the second water circuit circulation path, and the oil circuit circulation path are all connected, if the second preset temperature threshold is less than or equal to the coolant temperature, includes: If the following conditions are met: the second preset temperature threshold ≤ the coolant temperature < the fourth preset temperature threshold, then the oil circuit regulator (170) is controlled to be in the first oil setting; If the fourth preset temperature threshold is less than the coolant temperature, then the oil circuit regulator (170) is controlled to be in the second oil setting.

8. The engine temperature regulation method according to claim 5, characterized in that, The first preset temperature threshold is 82℃, and the second preset temperature threshold is 95℃.

9. The engine temperature regulation method according to claim 6, characterized in that, The third preset temperature threshold is 90℃.

10. The engine temperature regulation method according to claim 7, characterized in that, The fourth preset temperature threshold is 105℃.

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