An engine cooling system, control method, vehicle, and storage medium

Abstract

The application relates to the technical field of vehicles, and particularly discloses an engine cooling system, a control method, a vehicle and a storage medium, the engine cooling system comprising a first cooling cycle and a second cooling cycle, the first cooling cycle comprising a first water pump, a first pipeline and a second pipeline which are arranged in parallel and are both connected with the output end of the first water pump, an EGR cooler valve and an EGR cooler which are connected in series in the first pipeline, an oil cooler valve and an oil cooler which are connected in series in the second pipeline, and a first thermostat which is connected with the first pipeline and the second pipeline respectively, and the first outlet of the first thermostat is communicated with the input end of the first water pump; the second cooling cycle comprises a second water pump, an engine block water jacket, a cylinder head water jacket and a second thermostat which are connected in series, and the first output port of the second thermostat is communicated with the input end of the second water pump, and the temperature of the cooling liquid in the second cooling cycle of the engine cooling system can be quickly raised at the start of the engine to adapt to the starting requirement in a cold environment.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to an engine cooling system, control method, vehicle, and storage medium. Background Technology

[0002] With technological advancements, engine thermal efficiency is continuously improving, placing higher demands on engine cooling systems. The system's water flow rate should meet the engine's cooling needs without being excessive, ensuring engine reliability while minimizing heat loss and water pump power loss caused by excessive flow. Components in the engine requiring cooling typically include the oil cooler, EGR cooler, cylinder head water jacket, engine block water jacket, EGR valve, air compressor, and turbocharger.

[0003] Currently, engine cooling systems generally use a single water pump to cool the various components that require cooling. These components are usually connected in series or parallel. However, since different components have different coolant flow requirements under different engine operating conditions, a single water pump has poor control flexibility, which can easily lead to heat loss and water pump power loss.

[0004] In response, related technologies propose using two water pumps in the engine cooling system to cool the aforementioned components that require cooling. When using two water pumps, the engine block water jacket, oil cooler, and EGR cooler, which have higher coolant flow requirements, are typically cooled by one water pump, while other components with lower coolant flow requirements, such as the cylinder head water jacket, are cooled by the other water pump. For example, the engine cooling system disclosed in the earlier patent application CN201610763725.5 includes a first water pump and a second water pump. In the water circulation of the first water pump, the oil cooler and engine block water jacket are connected in series and then in parallel with the EGR cooler. In the water circulation of the second water pump, the cylinder head water jacket and the heater are connected in series. Compared with an engine cooling system using a single water pump, the control flexibility of two water pumps is significantly improved. However, during cold starts, the coolant temperature in the first water pump's water circulation is raised by the heat from the engine block water jacket, while the coolant temperature in the second water pump's water circulation is raised by the cylinder head water body. The overall temperature increase efficiency of the coolant is low, and the oil cooler also hinders the rapid increase of coolant temperature in the first water pump's water circulation.

[0005] The information disclosed above in this background section is only intended to enhance the understanding of this background section, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0006] The present application aims to provide an engine cooling system, a control method, a vehicle and a storage medium, so that the water temperature of the cooling liquid can be quickly raised when the engine is cold started; in addition, the water pump power consumption is reduced to improve the thermal efficiency.

[0007] In a first aspect, the present application provides an engine cooling system, comprising:

[0008] A first cooling cycle, comprising a first water pump, a first pipeline, a second pipeline, a first thermostat, an EGR cooler valve and an EGR cooler connected in series in the first pipeline, an oil cooler valve and an oil cooler connected in series in the second pipeline, the input end of the first pipeline and the input end of the second pipeline are in communication with the output end of the first water pump, the output end of the first pipeline and the output end of the second pipeline are in communication with the input end of the first thermostat, the first thermostat has a first outlet, and the first outlet is in communication with the input end of the first water pump;

[0009] A second cooling cycle, comprising a second water pump, a second thermostat, and a cylinder block water jacket and a cylinder head water jacket connected in series, the output end of the second water pump is in communication with the input end of the cylinder block water jacket, the output end of the cylinder head water jacket is in communication with the input end of the second thermostat, the second thermostat has a first output port, and the first output port is in communication with the input end of the second water pump.

[0010] As a preferred technical solution of the engine cooling system, the engine cooling system further comprises a radiator, the first thermostat further has a second outlet, the second thermostat further has a second output port, the second outlet and the second output port are in communication with the input end of the radiator, and the output end of the radiator is in communication with the input end of the first water pump and the input end of the second water pump, respectively.

[0011] As a preferred technical solution of the engine cooling system, the second cooling cycle further comprises:

[0012] A cylinder block water distribution channel connected in series between the output end of the second water pump and the input end of the cylinder block water jacket; and / or,

[0013] A heating device connected in series between the input end of the second thermostat and the input end of the second water pump; and / or,

[0014] A cylinder head water outlet pipe connected in series between the output end of the cylinder head water jacket and the input end of the second thermostat; and / or,

[0015] An EGR valve connected in parallel with the cylinder head water jacket and connected in series between the output end of the cylinder block water jacket and the input end of the second thermostat; and / or,

[0016] a bypass member connected in parallel with the cylinder head water jacket and in series between the output end of the engine block water jacket and the input end of the second water pump.

[0017] As a preferred technical solution of the engine cooling system, the engine cooling system further comprises an exhaust gas temperature sensor for detecting the temperature of the exhaust gas flowing after the EGR cooler, and an engine oil temperature sensor for detecting the temperature of the engine oil flowing after the engine oil cooler.

[0018] In a second aspect, the present application provides an engine cooling system control method, which is implemented by the engine cooling system according to any of the above-mentioned solutions, and comprises:

[0019] S100: acquiring in real time the temperature T of the exhaust gas flowing after the EGR cooler 11 , and the temperature T of the engine oil flowing after the engine oil cooler 21 ;

[0020] S110: comparing the values of T 11 and T 12 , and the values of T 21 and T 22 ; wherein T 12 is a first set temperature, and T 22 is a second set temperature;

[0021] If T 11 ≤ T 12 and T 21 > T 22 , then S120 is executed;

[0022] S120: fully opening the engine oil cooler valve;

[0023] S130: gradually increasing the rotation speed of the first water pump on the basis of the current value, and until T 21 ≤ T 22 or the rotation speed of the first water pump equals the maximum rotation speed of the first water pump;

[0024] S140: gradually reducing the opening degree of the EGR cooler valve, and until T 11 = T 12 or the opening degree of the EGR cooler valve equals zero, and then returning to step S100.

[0025] As a preferred technical solution of the engine cooling system control method, in step S110, if T 11 > T 12 and T 21 ≤ T 22 , then S150 is executed;

[0026] S150: open the EGR cooler valve fully;

[0027] S160: gradually increase the rotation speed of the first water pump on the current basis and until T 11 ≤ T 12 or the rotation speed of the first water pump is equal to the maximum rotation speed of the first water pump;

[0028] S170: gradually decrease the opening of the oil cooler valve and until T 21 = T 22 or the opening of the oil cooler valve is equal to zero, and then return to step S110.

[0029] As a preferred technical solution of the control method of the engine cooling system, in step S110, if T 11 ≤ T 12 and T 21 ≤ T 22 ; then execute S180;

[0030] S180: open the EGR cooler valve fully and open the oil cooler valve fully;

[0031] S190: determine whether the rotation speed of the first water pump is zero;

[0032] If yes, execute S200; if no, execute S210;

[0033] S200: keep the rotation speed of the first water pump unchanged, and then return to step S110;

[0034] S210: reduce the rotation speed of the first water pump by a first preset value, and then return to step S110.

[0035] As a preferred technical solution of the control method of the engine cooling system, in step S110, if T 11 > T 12 and T 21 > T 22 ; then execute S220;

[0036] S220: open the EGR cooler valve fully and open the oil cooler valve fully;

[0037] S230: determine whether the rotation speed of the first water pump is equal to the maximum rotation speed of the first water pump;

[0038] If yes, execute S240; if no, execute S250;

[0039] S240: keep the rotation speed of the first water pump unchanged, and then return to step S110;

[0040] S250: Increase the rotation speed of the first water pump by a second preset value, and then return to step S110.

[0041] In a third aspect, the present application provides a vehicle, comprising:

[0042] one or more processors;

[0043] a storage device configured to store one or more programs;

[0044] The one or more programs, when executed by the one or more processors, cause the one or more processors to control the vehicle to implement the control method of the engine cooling system according to any one of the above aspects.

[0045] In a fourth aspect, the present application provides a storage medium, which stores a program that, when executed by a processor, causes a vehicle to implement the control method of the engine cooling system according to any one of the above aspects.

[0046] The beneficial effects of the present application are as follows:

[0047] The application provides an engine cooling system, a control method, a vehicle and a storage medium, the engine cooling system comprising a first cooling cycle and a second cooling cycle, the first cooling cycle comprising a first water pump, a first pipeline, a second pipeline, a first thermostat, an EGR cooler valve and an EGR cooler connected in series in the first pipeline, and an oil cooler valve and an oil cooler connected in series in the second pipeline, the input end of the first pipeline and the input end of the second pipeline being communicated with the output end of the first water pump, the output end of the first pipeline and the output end of the second pipeline being communicated with the input end of the first thermostat, the first thermostat having a first outlet communicated with the input end of the first water pump; the second cooling cycle comprising a second water pump, a second thermostat, and a cylinder block water jacket and a cylinder head water jacket arranged in series, the output end of the second water pump being communicated with the input end of the cylinder block water jacket, the output end of the cylinder head water jacket being communicated with the input end of the second thermostat, the second thermostat having a first output port communicated with the input end of the second water pump. The engine cooling system provided by the embodiment can only provide cooling liquid for the oil cooler and the EGR cooler by the first water pump, the oil cooler and the EGR cooler are arranged in parallel, the cooling liquid flow through the oil cooler can be controlled by the oil cooler valve, the flow through the EGR cooler can be controlled by the EGR cooler valve, the cooling liquid in the first cooling cycle can be controlled as a whole by adjusting the rotating speed of the first water pump, and the control is flexible; the cylinder block water jacket and the cylinder head water jacket are supplied with cooling liquid by the second water pump, when cold starting, the cooling liquid in the second cycle is sequentially heat-exchanged with the cylinder block water jacket and the cylinder head water jacket, so that the temperature of the cooling liquid can be quickly raised to meet the starting requirement in a cold environment; and the cooling liquid in the second cooling cycle only accounts for a part of the whole cooling liquid, and the temperature raising efficiency of the cooling liquid in the second cooling cycle can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 FIG. 1 is a structural schematic diagram of the first cooling cycle in the engine cooling system in the embodiment of the application;

[0049] Figure 2 FIG. 2 is a structural schematic diagram of the second cooling cycle in the engine cooling system in the embodiment of the application;

[0050] Figure 3 FIG. 3 is a first flow chart of the control method of the engine cooling system in the embodiment of the application;

[0051] Figure 4 FIG. 4 is a second flow chart of the control method of the engine cooling system in the embodiment of the application;

[0052] Figure 5 FIG. 5 is a third flow chart of the control method of the engine cooling system in the embodiment of the application;

[0053] Figure 6A fourth flow chart of the control method of the engine cooling system in the embodiment of the present application;

[0054] Figure 7 A fifth flow chart of the control method of the engine cooling system in the embodiment of the present application;

[0055] Figure 8 A sixth flow chart of the control method of the engine cooling system in the embodiment of the present application;

[0056] Figure 9 A structural schematic diagram of the control system of the engine cooling system provided by the embodiment of the present application.

[0057] In the figure:

[0058] 11, first water pump; 12, first pipeline; 13, second pipeline; 14, first thermostat; 15, EGR cooler valve; 16, EGR cooler; 17, oil cooler valve; 18, oil cooler;

[0059] 21, second water pump; 22, second thermostat; 23, engine block water jacket; 24, cylinder head water jacket; 25, engine block water distribution passage; 26, heater device; 27, cylinder head water outlet pipe; 28, EGR valve; 29, accessory;

[0060] 31, radiator; 32, exhaust gas temperature sensor; 33, oil temperature sensor;

[0061] 100, terminal device; 110, processor; 120, ROM; 130, RAM; 140, bus; 150, I / O interface; 160, input unit; 170, output unit; 180, storage unit; 190, communication unit. DETAILED DESCRIPTION

[0062] The technical solutions of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0063] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "over" and "on" of the first feature to the second feature include the first feature above and obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height. The "below", "under" and "under" of the first feature to the second feature include the first feature below and obliquely below the second feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0064] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0066] The present embodiment can be applied to the case of automatically controlling whether the vehicle is coasting, and the control method of the engine cooling system can be executed by an engine cooling system control device which can be realized by software and / or hardware and integrated in the vehicle.

[0067] The engine cooling system provided in the related art comprises a first water pump and a second water pump, wherein in the water circulation of the first water pump, an oil cooler and an engine block water jacket are connected in series, and then connected in parallel with an EGR cooler; in the water circulation of the second water pump, a cylinder head water jacket and a heater are connected in series; however, when the engine cooling system is started, the temperature of the coolant is raised by the heat of the engine block water jacket in the water circulation of the first water pump, and the temperature of the coolant is raised by the heat of the cylinder head water jacket in the water circulation of the second water pump, the temperature raising efficiency of the coolant as a whole is low, and the oil cooler in the water circulation of the first water pump also hinders the rapid raising of the temperature of the coolant.

[0068] To this end, the embodiment provides an engine cooling system to solve the above problems. The engine cooling system can be integrated in an engine to cool relevant parts during the operation of the engine.

[0069] Specifically, please refer to Figure 1 and Figure 2The engine cooling system comprises a first cooling cycle and a second cooling cycle. The first cooling cycle comprises a first water pump 11, a first pipeline 12, a second pipeline 13, a first thermostat 14, an EGR cooler valve 15 and an EGR cooler 16 connected in series to the first pipeline 12, and an oil cooler valve 17 and an oil cooler 18 connected in series to the second pipeline 13. The input end of the first pipeline 12 and the input end of the second pipeline 13 are both in communication with the output end of the first water pump 11. The output end of the first pipeline 12 and the output end of the second pipeline 13 are both in communication with the input end of the first thermostat 14. The first thermostat 14 has a first outlet in communication with the input end of the first water pump 11. The second cooling cycle comprises a second water pump 21, a second thermostat 22, and a cylinder block water jacket 23 and a cylinder head water jacket 24 connected in series. The output end of the second water pump 21 is in communication with the input end of the cylinder block water jacket 23. The output end of the cylinder head water jacket 24 is in communication with the input end of the second thermostat 22. The second thermostat 22 has a first outlet in communication with the input end of the second water pump 21. The engine cooling system provided in the embodiment has the following advantages. The first water pump 11 only provides cooling liquid for the oil cooler 18 and the EGR cooler 16. The oil cooler 18 and the EGR cooler 16 are connected in parallel. The flow of the cooling liquid through the oil cooler 18 can be controlled by the oil cooler valve 17. The flow of the cooling liquid through the EGR cooler 16 can be controlled by the EGR cooler valve 15. The cooling liquid in the first cooling cycle can be controlled as a whole by adjusting the rotating speed of the first water pump 11. The control is flexible. The second water pump 21 provides cooling liquid for the cylinder block water jacket 23 and the cylinder head water jacket 24. When the engine is started, the cooling liquid in the second cooling cycle is sequentially exchanged with the cylinder block water jacket 23 and the cylinder head water jacket 24. The temperature of the cooling liquid can be quickly raised to meet the starting requirement in a cold environment. The cooling liquid in the second cooling cycle only accounts for a part of the whole cooling liquid. The temperature of the cooling liquid in the second cooling cycle can be further raised.

[0070] It should be noted that the first water pump 11 is an electronic water pump. The second water pump 21 can be an electronic water pump or a mechanical water pump according to actual requirements. Specifically, the second water pump 21 is a mechanical water pump in the embodiment. The first water pump 11 can work after the engine is started and can also work after the engine is stopped to avoid damage of the EGR cooler 16 and the oil cooler 18 due to excessive residual heat.

[0071] In an optional embodiment, please refer to Figure 1 and Figure 2The engine cooling system further comprises a radiator 31, the first thermostat 14 further has a second outlet, the second thermostat 22 further has a second outlet, the second outlet and the second outlet are both in communication with an input end of the radiator 31, and an output end of the radiator 31 is in communication with the input end of the first water pump 11 and the input end of the second water pump 21 respectively. In this way, the first cooling cycle and the second cooling cycle share the radiator 31 simultaneously.

[0072] In other embodiments, the engine cooling system further comprises a first radiator and a second radiator, the first thermostat 14 further has a second outlet, the second thermostat 22 further has a second outlet, the second outlet is in communication with an input end of the first radiator, an output end of the first radiator is in communication with the input end of the first water pump 11, the second outlet is in communication with an input end of the second radiator, and an output end of the second radiator is in communication with the input end of the second water pump 21. In this way, the first cooling cycle uses the first radiator for heat dissipation, and the second cooling cycle uses the second radiator for heat dissipation.

[0073] When the temperature of the cooling liquid in the first cooling cycle is lower than the set lower limit temperature, it indicates that the temperature of the cooling liquid in the first cooling cycle is low, and the heat dissipation needs of the oil cooler 18 and the EGR cooler 16 can be fully met, the first thermostat 14 is in the small cycle state, the input end of the first thermostat 14 is only in communication with the first outlet, so that the cooling liquid in the first cooling cycle can directly flow back to the first water pump 11 without passing through the radiator 31; when the temperature of the cooling liquid in the first cooling cycle is higher than the set lower limit temperature and does not exceed the set upper limit temperature, it indicates that the temperature of the cooling liquid in the first cooling cycle is moderate, and if the heat dissipation needs of the oil cooler 18 and the EGR cooler 16 are to be fully met, the cooling liquid needs to be cooled to a certain extent, at this time, the first thermostat 14 is in a state between the small cycle state and the large cycle state, the input end of the first thermostat 14 is in communication with the first outlet and the second outlet at the same time, so that part of the cooling liquid directly flows back to the first water pump 11, and another part of the cooling liquid needs to be cooled by the radiator 31 before flowing back to the first water pump 11; when the temperature of the cooling liquid in the first cooling cycle is higher than the set upper limit temperature, it indicates that the temperature of the cooling liquid in the first cooling cycle is high, and if the heat dissipation needs of the oil cooler 18 and the EGR cooler 16 are to be fully met, the cooling liquid needs to be cooled to the maximum extent, the input end of the first thermostat 14 is only in communication with the second outlet, and the first thermostat 14 is in the large cycle state, so that the cooling liquid flows back to the first water pump 11 after being cooled by the radiator 31.

[0074] When the temperature in the second cooling cycle is lower than the set lower limit temperature, it indicates that the temperature of the coolant in the second cooling cycle is low and can fully meet the heat dissipation needs of the engine block water jacket 23 and the cylinder head water jacket 24 and other components, the second thermostat 22 is in a small cycle state, and the input end of the second thermostat 22 is only in communication with the first output port, so that the coolant in the second cooling cycle can directly flow back to the second water pump 21 without passing through the radiator 31; when the temperature of the coolant in the second cooling cycle is higher than the set lower limit temperature and does not exceed the set upper limit temperature, it indicates that the temperature of the coolant in the second cooling cycle is moderate, and if the heat dissipation needs of the engine block water jacket 23 and the cylinder head water jacket 24 and other components are to be fully met, the coolant also needs to be cooled to a certain extent, at this time the second thermostat 22 is in a state between the small cycle state and the large cycle state, the input end of the second thermostat 22 is in communication with the first output port and the second output port at the same time, so that part of the coolant directly flows back to the second water pump 21, and another part of the coolant needs to be cooled after passing through the radiator 31 and then flows back to the second water pump 21; when the temperature of the coolant in the second cooling cycle is higher than the set upper limit temperature, it indicates that the temperature of the coolant in the second cooling cycle is high, and if the heat dissipation needs of the engine block water jacket 23 and the cylinder head water jacket 24 are to be fully met, the coolant also needs to be cooled to the maximum extent, the input end of the second thermostat 22 is only in communication with the second output port, the second thermostat 22 is in a large cycle state, so that the coolant flows back to the second water pump 21 after being cooled by the radiator 31.

[0075] In an alternative embodiment, referring to Figure 1 The engine cooling system further comprises an exhaust gas temperature sensor 32 for detecting the temperature of the exhaust gas after passing through the EGR cooler 16. The temperature of the exhaust gas after passing through the EGR cooler 16 is detected by the exhaust gas temperature sensor 32. Specifically, when the temperature of the exhaust gas is too high, the cooling effect of the EGR cooler 16 needs to be enhanced, for example, the opening of the EGR cooler valve 15 is increased and / or the rotating speed of the first water pump 11 is increased; when the temperature of the exhaust gas is too low, the rotating speed of the first water pump 11 can be reduced to reduce the power loss of the first water pump 11 under the condition that the cooling effect of the oil cooler 18 meets the use needs.

[0076] In an alternative embodiment, referring to Figure 1The engine cooling system further comprises an oil temperature sensor 33 for detecting the temperature of the oil after passing through the oil cooler 18. By detecting the temperature of the oil after passing through the oil cooler 18 via the oil temperature sensor 33, when the temperature of the oil is too high, the cooling effect of the oil cooler 18 needs to be enhanced, for example, by increasing the opening of the oil cooler valve 17 and / or increasing the rotation speed of the first water pump 11; when the temperature of the oil is too low, the rotation speed of the first water pump 11 can be reduced to reduce the power loss of the first water pump 11, while ensuring that the cooling effect of the EGR cooler 16 meets the use requirements.

[0077] In an optional embodiment, referring to Figure 2 The second cooling cycle further comprises a cylinder block water gallery 25 connected in series between the output end of the second water pump 21 and the input end of the cylinder block water jacket 23. In this way, the cylinder block water gallery 25 can also be cooled by the second cooling cycle. The cylinder block water gallery 25 is used to cool each cylinder of the engine.

[0078] In an optional embodiment, referring to Figure 2 The second cooling cycle further comprises a heater 26 connected in series between the input end of the second thermostat 22 and the input end of the second water pump 21. In this way, the heater 26 can also be heated by the second cooling cycle to make full use of the heat. In addition, since the cooling liquid in the second cooling cycle only accounts for a part of all the cooling liquid, and sequentially flows through the cylinder block water gallery 25, the cylinder block water jacket 23 and the cylinder head water jacket 24 with high temperatures, the temperature of the cooling liquid can be quickly raised, which helps to quickly raise the temperature of the heater 26 after starting the engine in a low temperature environment.

[0079] In an optional embodiment, referring to Figure 2 The second cooling cycle further comprises a cylinder head outlet pipe 27 connected in series between the output end of the cylinder head water jacket 24 and the input end of the second thermostat 22.

[0080] In an optional embodiment, referring to Figure 2, the second cooling cycle further comprises an EGR valve 28 connected in parallel with the cylinder head water jacket 24 and in series between the output end of the engine block water jacket 23 and the input end of the second thermostat 22. Specifically, in this embodiment, the input end of the EGR valve 28 is in communication with the output end of the engine block water jacket 23, and the output end of the EGR valve 28 is in communication with the cylinder head water outlet pipe 27. In this way, a portion of the coolant flowing out of the engine block water jacket 23 flows to the cylinder head water jacket 24, and another portion of the coolant flows to the EGR valve 28 and cools the EGR valve 28, making full use of the characteristics that the flow demand of the engine block water jacket 23 for the coolant is greater than the flow demand of the cylinder head water jacket 24 for the coolant, and the flow demand of the engine block water jacket 23 for the coolant is greater than the flow demand of the EGR valve 28 for the coolant, to avoid power loss of the second water pump 21. In other embodiments, the input end of the EGR valve 28 is in communication with the output end of the engine block water jacket 23, and the output end of the EGR valve 28 is in communication with the input end of the second thermostat 22.

[0081] In an optional embodiment, referring to Figure 2 , the second cooling cycle further comprises an accessory 29 connected in parallel with the cylinder head water jacket 24 and in series between the output end of the engine block water jacket 23 and the input end of the second water pump 21. Specifically, in this embodiment, the accessory 29 comprises a supercharger and an air compressor arranged in series or in parallel. In this way, the coolant flowing out of the engine block water jacket 23 is divided into three portions, the first portion of the coolant flows to the cylinder head water jacket 24 to cool the cylinder head water jacket 24, the second portion of the coolant flows to the EGR valve 28 and cools the EGR valve 28, and the third portion flows to the accessory 29 and cools the accessory 29, making full use of the characteristics that the flow demand of the engine block water jacket 23 for the coolant is not less than the sum of the flow demand of the cylinder head water jacket 24 for the coolant, the flow demand of the EGR valve 28 for the coolant, and the flow demand of the accessory 29 for the coolant, to further avoid power waste of the second water pump 21. In other embodiments of this embodiment, the accessory 29 can also be other components on the engine that need to be cooled by the coolant.

[0082] The present embodiment also provides a control method of an engine cooling system, which is implemented by the engine cooling system in the above-mentioned solution. The control method is suitable for accurately controlling the cooling capacity of the EGR cooler 16 and the oil cooler 18 in the engine cooling system, and can reduce the amount of coolant required, thereby avoiding heat loss and power loss of the first water pump 11. The control method of the engine cooling system can be executed by an engine cooling system control device, which can be realized by software and / or hardware and integrated in a vehicle.

[0083] Specifically, referring to Figure 3 and Figure 4 , the control method of the engine cooling system comprises the following steps:

[0084] S100: acquiring the temperature T of the exhaust gas flowing through the EGR cooler 16 in real time 11 , and the temperature T of the engine oil flowing through the engine oil cooler 18 21 .

[0085] The temperature of the exhaust gas flowing through the EGR cooler 16 can be detected by the exhaust gas temperature sensor 32, and the temperature of the engine oil flowing through the engine oil cooler 18 can be detected by the engine oil temperature sensor 33.

[0086] In the embodiment, the step of acquiring the temperature T of the exhaust gas flowing through the EGR cooler 16 and the temperature T of the engine oil flowing through the engine oil cooler 18 is performed every unit time, and the unit time can be set according to actual needs, for example, 1 millisecond, etc., so that the value of T 11 acquired at different times and the value of T 21 are different.

[0087] S110: comparing the size of T 11 and T 12 , and the size of T 21 and T 22 .

[0088] In the embodiment, T 12 is the first set temperature, and T 22 is the second set temperature. The size of T 12 and T 22 can be set according to actual needs. It can be understood that T 12 is the upper limit temperature threshold of the recirculated exhaust gas when the engine is normally working; and T 22 is the upper limit temperature threshold of the engine oil when the engine is normally working. When T 11 does not exceed T 12 , it indicates that the EGR cooler 16 can sufficiently cool the exhaust gas flowing therethrough at this time, and the temperature of the exhaust gas meets the requirements; when T 11 exceeds T 12 , it indicates that the cooling effect of the EGR cooler 16 is insufficient at this time, and the cooling capacity of the EGR cooler 16 needs to be further improved; when T 21 does not exceed T 22 , it indicates that the engine oil cooler 18 can sufficiently cool the engine oil flowing therethrough at this time, and the temperature of the engine oil meets the requirements; when T 21 exceeds T 22 , it indicates that the cooling effect of the engine oil cooler 18 is insufficient at this time, and the cooling capacity of the engine oil cooler 18 needs to be further improved.

[0089] If T 11 exceeds T 12 , the ECU 20 controls the EGR cooler 16 to increase the cooling capacity of the EGR cooler 16.11 ≤ T 12 and T 21 > T 22 ; then S120 is executed;

[0090] S120: fully open the oil cooler valve 17.

[0091] By executing step S120, the flow rate of the coolant flowing through the oil cooler 18 can reach the maximum flow rate at the current first water pump 11 rotation speed, so that the cooling capacity of the oil cooler 18 is maximized, thereby effectively reducing the value of T 21 .

[0092] S130: gradually increase the rotation speed of the first water pump 11 on the current basis, and until T 21 ≤ T 22 or the rotation speed of the first water pump 11 is equal to the maximum rotation speed V of the first water pump 11.

[0093] Through step S130, on the basis of fully opening the oil cooler valve 17, the flow rate of the coolant flowing through the oil cooler 18 can continue to increase, thereby further improving the cooling capacity of the oil cooler 18, so that the temperature of the oil flowing through the oil cooler 18 is reduced as soon as possible.

[0094] Specifically, step S130 includes the following steps.

[0095] S1310: increase the rotation speed of the first water pump 11 by a first set rotation speed, and obtain the current rotation speed V1 of the first water pump 11.

[0096] The first set rotation speed can be set according to actual needs.

[0097] It should be noted that after the rotation speed of the first water pump 11 is increased by the first set rotation speed, if the rotation speed of the first water pump 11 exceeds its maximum rotation speed V, the first water pump 11 operates at its maximum rotation speed V.

[0098] S1320: compare the size of T 21 and T 22 and the size of V1 and V.

[0099] If T 21 ≤ T 22 or V1 = V, then S140 is executed; if T 21 > T 22 and V1 < V, then return to step S1310.

[0100] S140: gradually reduce the opening degree of the EGR cooler valve 15, and until T 11 = T 12Or the opening of the EGR cooler valve 15 is equal to zero, then return to step S110.

[0101] Specifically, step S140 includes the following steps.

[0102] S1410: Reduce the opening of the EGR cooler valve 15 by a first set opening, and obtain the current opening N1 of the EGR cooler valve 15.

[0103] Wherein, the first set opening can be set according to actual needs.

[0104] S1420: Compare the size of T 11 and T 12 , and the size of N1 and 0.

[0105] If T 11 =T 12 or N1=0, return to step S110; if T 11 <T 12 and N1≠0, return to step S1410.

[0106] Through step S140, the EGR cooler 16 can reduce the flow rate through the EGR cooler 16 while maintaining effective cooling of the exhaust gas flowing therethrough, and if the rotational speed of the first water pump 11 reaches its maximum rotational speed V in step S130, more coolant can flow through the oil cooler 18, thereby further improving the cooling effect of the oil cooler 18 on the oil. If T 21 ≤T 22 in step S130, the subsequent steps S180 to S210 can be entered in the next cycle to reduce the rotational speed of the first water pump 11 and reduce power loss (see below for details).

[0107] The control method of the engine cooling system provided by the embodiment acquires the temperature T 11 of the exhaust gas after flowing through the EGR cooler 16, and the temperature T 21 of the oil after flowing through the oil cooler 18 in real time, then compares the size of T 11 and T 12 , and the size of T 21 and T 22 , when T 11 ≤T 12 and T 21 >T 22 , the oil cooler valve 17 is fully opened, and then the rotational speed of the first water pump 11 is gradually increased on the current basis, and until T 21 ≤T 22or the rotation speed of the first water pump 11 is equal to the maximum rotation speed of the first water pump 11, then the opening of the EGR cooler valve 15 is gradually reduced, and until T 11 =T 21 or the opening of the EGR cooler valve 15 is equal to zero, the cooling capacity of the oil cooler 18 can be enhanced, and the cooling liquid flow through the EGR cooler 16 is reduced under the condition that the cooling effect of the EGR cooler 16 meets the demand, and through the next cycle, more cooling liquid flows through the oil cooler 18 to further enhance the cooling capacity of the oil cooler 18 under the condition that the rotation speed of the first water pump 11 reaches its maximum rotation speed. The control method of the engine cooling system realizes flexible control of the cooling capacity of the EGR cooler 16 and the oil cooler 18, and can realize accurate distribution of the cooling liquid between the EGR cooler 16 and the oil cooler 18, reduce the demand for the amount of cooling liquid, avoid heat loss and waste of power of the first water pump 11, and ensure the thermal efficiency of the engine.

[0108] In an optional embodiment, referring to Figure 5 and Figure 6 , in step S110, if T 11 >T 12 and T 21 ≤T 22 , S150 is executed.

[0109] S150: fully open the EGR cooler valve 15.

[0110] By executing step S150, the flow of cooling liquid through the EGR cooler 16 can reach the maximum flow under the current rotation speed of the first water pump 11, so that the cooling capacity of the EGR cooler 16 can be enhanced to the maximum, thereby effectively reducing the value of T 11 .

[0111] S160: gradually increase the rotation speed of the first water pump 11 on the current basis, and until T 11 ≤T 12 or the rotation speed of the first water pump 11 is equal to the maximum rotation speed of the first water pump 11.

[0112] Through step S160, on the basis of fully opening the EGR cooler valve 15, the flow of cooling liquid through the EGR cooler 16 can continue to increase, thereby further enhancing the cooling capacity of the EGR cooler 16 to quickly reduce the temperature of the oil flowing through the EGR cooler 16.

[0113] Specifically, step S160 includes the following steps.

[0114] S1610: increase the rotation speed of the first water pump 11 by a second set rotation speed, and obtain the current rotation speed V1 of the first water pump 11.

[0115] The second set rotation speed can be set according to actual needs.

[0116] It should be noted that if the rotation speed of the first water pump 11 is increased by the second set rotation speed and the rotation speed of the first water pump 11 exceeds its maximum rotation speed V, the first water pump 11 operates at its maximum rotation speed V.

[0117] S1620: Compare T 11 and T 12 , and compare V1 and V.

[0118] If T 11 =T 12 or V1=V, execute S170; if T 11 >T 12 and V1

[0119] S170: Gradually reduce the opening of the oil cooler valve 17 until T 21 =T 22 or the opening of the oil cooler valve 17 is equal to zero, and then return to step S110.

[0120] Specifically, step S170 includes the following steps.

[0121] S1710: Reduce the opening of the oil cooler valve 17 by a second set opening, and obtain the current opening N2 of the oil cooler valve 17.

[0122] The second set opening can be set according to actual needs.

[0123] S1720: Compare T 21 and T 22 , and compare N2 and 0.

[0124] If T 21 =T 22 or N2=0, return to step S110; if T 21 22 and N2≠0, return to step S1710.

[0125] Through step S170, the oil cooler 18 can reduce the flow rate through the oil cooler 18 while maintaining effective cooling of the oil flowing therethrough. If the rotation speed of the first water pump 11 reaches its maximum rotation speed V in step S160, more coolant can flow through the EGR cooler 16, thereby further improving the cooling effect of the EGR cooler 16 on the EGR. If T 11 =T 12 ​Then, in the next cycle, the subsequent steps S180 to S210 can be entered to reduce the rotation speed of the first water pump 11 and reduce the power loss (see below for details).

[0126] The control method of the engine cooling system provided by the embodiment can obtain the temperature T 11 of the exhaust gas flowing through the EGR cooler 16 and the temperature T 21 of the engine oil flowing through the engine oil cooler 18 in real time 11 , compare the size of T 12 and T 21 , and compare the size of T 22 and T 11 . When T 12 > T 21 and T 22 ≤ T 11 , the EGR cooler valve 15 is fully opened, and then the rotation speed of the first water pump 11 is gradually increased on the basis of the current rotation speed and is increased until T 12 ≤ T 21 or the rotation speed of the first water pump 11 is equal to the maximum rotation speed of the first water pump 11, and then the opening degree of the engine oil cooler valve 17 is gradually reduced and is reduced until T 22 = T 11 or the opening degree of the engine oil cooler valve 17 is equal to zero. In this way, the cooling capacity of the EGR cooler 16 can be enhanced, and the cooling liquid flow rate through the engine oil cooler 18 can be reduced under the condition that the cooling effect of the engine oil cooler 18 meets the demand. When the rotation speed of the first water pump 11 reaches the maximum rotation speed of the first water pump 11, more cooling liquid flows through the EGR cooler 16 through the next cycle, so as to further improve the cooling capacity of the EGR cooler 16. The control method of the engine cooling system can flexibly control the cooling capacity of the EGR cooler 16 and the engine oil cooler 18, accurately distribute the cooling liquid between the EGR cooler 16 and the engine oil cooler 18, reduce the demand for the amount of cooling liquid, avoid heat loss and power loss of the first water pump 11, and ensure the thermal efficiency of the engine.

[0127] In an optional embodiment, please refer to Figure 7 , in step S110, if T 11 ≤ T 12 and T 21 ≤ T 22 , S180 is executed.

[0128] S180: The EGR cooler valve 15 is fully opened, and the engine oil cooler valve 17 is fully opened.

[0129] Through step S180, the cooling liquid pumped by the first water pump 11 can flow through the EGR cooler 16 and the engine oil cooler 18 in the maximum amount.

[0130] S190: determining whether the rotation speed of the first water pump 11 is zero.

[0131] If yes, S200 is executed; if no, S210 is executed.

[0132] S200: keeping the rotation speed of the first water pump 11 unchanged, and then returning to step S110.

[0133] When the rotation speed of the first water pump 11 is zero, it indicates that the engine is in the process of warming up, and the temperature of the engine is relatively low. By setting the rotation speed of the first water pump 11 to zero, the temperature of the engine oil can be quickly raised to ensure the normal operation of the engine. For example, in the case of low ambient temperature, the actual temperature of the engine oil is far lower than the temperature required for the normal operation of the engine. By setting the rotation speed of the first water pump 11 to zero, the temperature of the engine oil can be quickly raised to the level required for the normal operation of the engine.

[0134] S210: reducing the rotation speed of the first water pump 11 by a first preset value, and then returning to step S110.

[0135] The first preset value can be set according to actual needs.

[0136] When the rotation speed of the first water pump 11 is not reduced to zero, by repeating steps S180 to S210, the rotation speed of the first water pump 11 can be reduced to the minimum under the condition that T 11 ≤ T 12 and T 21 ≤ T 22 , thereby reducing the power loss.

[0137] In an optional embodiment, please refer to Figure 8 In step S110, if T 11 > T 12 and T 21 > T 22 , S220 is executed.

[0138] S220: fully opening the EGR cooler valve 15 and fully opening the engine oil cooler valve 17.

[0139] S230: determining whether the rotation speed of the first water pump 11 is equal to the maximum rotation speed of the first water pump 11.

[0140] If yes, S240 is executed; if no, S250 is executed.

[0141] S240: keeping the rotation speed of the first water pump 11 unchanged, and then returning to step S110.

[0142] When the rotation speed of the first water pump 11 is equal to the maximum rotation speed of the first water pump 11, it indicates that the engine overall temperature is too high at this time, and the first water pump 11 should be maintained to run at the maximum rotation speed.

[0143] S250: increase the rotation speed of the first water pump 11 by a second preset value, and then return to step S110.

[0144] The second preset value can be set according to actual needs.

[0145] When the rotation speed of the first water pump 11 is less than the maximum rotation speed of the first water pump 11, it indicates that the current rotation speed of the first water pump 11 cannot match the demand of the engine oil and exhaust gas for refrigeration, and the rotation speed of the first water pump 11 should be continuously increased. Through the circulation of steps S220 to S250, the rotation speed of the first water pump 11 can be gradually increased until T 11 >T 12 and T 21 >T 22 , and the cooling of the exhaust gas and the oil can meet the demand of the engine. 11 ≤T 12 and T 21 ≤T 22 .

[0146] Figure 9 is a structural schematic diagram of a control system of an engine cooling system provided by an embodiment of the present application. Please refer to Figure 9 The present embodiment also provides a vehicle. The vehicle (or terminal device) is intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The terminal device can also represent various forms of mobile devices, such as personal digital processors, cellular telephones, smart phones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown in this paper, their connections and relationships, and their functions are only as examples, and are not intended to limit the implementation of the invention described and / or claimed herein.

[0147] As Figure 9As shown, the terminal device 100 includes one or more processors 110, and storage devices, such as a ROM 120, a random access memory (RAM) 130, and the like, which are communicatively connected to the processor 110. The storage devices store computer programs that are executable by the one or more processors. The processor 110 can perform various appropriate actions and processes according to the computer programs stored in the ROM 120 or loaded from the storage unit 180 into the RAM 130. Various programs and data required for the operation of the terminal device 100 can also be stored in the RAM 130. The processor 110, the ROM 120, and the RAM 130 are connected to each other through a bus 140. An I / O interface 150 is also connected to the bus 140.

[0148] Various components in the terminal device 100 are connected to the I / O interface 150, including an input unit 160, such as a keyboard, a mouse, and the like, an output unit 170, such as various types of displays, speakers, and the like, a storage unit 180, such as a magnetic disk, an optical disk, and the like, and a communication unit 190, such as a network card, a modem, a wireless communication transceiver, and the like. The communication unit 190 allows the terminal device 100 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0149] The processor 110 can be various general and / or special purpose processing components having processing and computing capabilities. Some examples of the processor 110 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, and the like. The processor 110 performs various methods and processes described above, such as the control method of the engine cooling system.

[0150] In some embodiments, the control method of the engine cooling system can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 180. In some embodiments, part or all of the computer program can be loaded and / or installed onto the terminal device 100 via the ROM 120 and / or the communication unit 190. When the computer program is loaded onto the RAM 130 and executed by the processor 110, one or more steps of the control method of the engine cooling system described above can be performed. Alternatively, in other embodiments, the processor 110 can be configured to perform the control method of the engine cooling system by any other appropriate means, such as by means of firmware.

[0151] The various embodiments of the systems and techniques described above can be implemented in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a load programmable logic device (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0152] Computer programs used to implement the processes of the application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer program

[0153] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store computer programs for use by or in connection with an instruction execution system, apparatus, or device. Computer-readable storage media can include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium will include one or more lines of a program of instructions in a transitory signal, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0154] To provide for interaction with a user, the systems and techniques described here can be implemented on a terminal device having a display, e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor, for displaying information to the user and a keyboard and a pointing device, e.g., a mouse or a trackball, by which the user can provide input to the terminal device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback, e.g., visual feedback, auditory feedback, or tactile feedback; and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0155] The systems and techniques described here can be implemented in a computing system that includes a back end component, e.g., as a data server, or that includes a middleware component, e.g., an application server, or that includes a front end component, e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here, or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication, e.g., a communication network. Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0156] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0157] It should be understood that the various forms of flow shown above can be re-ordered, added to, or deleted from without departing from the scope of the present application. For example, the steps recited in the present application can be executed in parallel, executed in sequence, or executed in a different order, as long as the desired results of the technical solutions of the present application can be achieved, and the present application is not limited herein.

[0158] The above description is only preferred embodiments of the present application and the explanation of the technical principles of the application. It should be understood by those skilled in the art that the disclosed scope of the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by the combinations of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the technical solutions formed by the above features and the technical features disclosed in the present application (but not limited to) with similar functions are replaced with each other.

[0159] Furthermore, although several specific implementation details have been discussed in the above discussion, these should not be construed as limiting the scope of the application. Certain features described in the context of separate embodiments can also be implemented in combination. Conversely, various features described in the context of a single embodiment can also be implemented separately or in any suitable subcombination.

[0160] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. An engine cooling system, characterized in that, include: The first cooling cycle includes a first water pump (11), a first pipeline (12), a second pipeline (13), a first thermostat (14), an EGR cooler valve (15) and an EGR cooler (16) connected in series in the first pipeline (12), and an oil cooler valve (17) and an oil cooler (18) connected in series in the second pipeline (13). The input end of the first pipeline (12) and the input end of the second pipeline (13) are both connected to the output end of the first water pump (11). The output end of the first pipeline (12) and the output end of the second pipeline (13) are both connected to the input end of the first thermostat (14). The first thermostat (14) has a first outlet, which is connected to the input end of the first water pump (11). The second cooling cycle includes a second water pump (21), a second thermostat (22), and a body water jacket (23) and a cylinder head water jacket (24) connected in series. The output end of the second water pump (21) is connected to the input end of the body water jacket (23), and the output end of the cylinder head water jacket (24) is connected to the input end of the second thermostat (22). The second thermostat (22) has a first output port, which is connected to the input end of the second water pump (21). The engine cooling system also includes a radiator (31), the first thermostat (14) has a second outlet, the second thermostat (22) has a second output port, the second outlet and the second output port are both connected to the input end of the radiator (31), and the output end of the radiator (31) is connected to the input end of the first water pump (11) and the input end of the second water pump (21) respectively. The engine cooling system also includes an exhaust gas temperature sensor (32) for detecting the temperature of the exhaust gas flowing through the EGR cooler (16), and an oil temperature sensor (33) for detecting the temperature of the oil flowing through the oil cooler (18). The second cooling cycle also includes an EGR valve (28) connected in parallel with the cylinder head water jacket (24) and in series between the output end of the engine block water jacket (23) and the input end of the second thermostat (22); and / or, an accessory (29) connected in parallel with the cylinder head water jacket (24) and in series between the output end of the engine block water jacket (23) and the input end of the second water pump (21).

2. The engine cooling system according to claim 1, characterized in that, The second cooling cycle also includes: A water distribution channel (25) connected in series between the output end of the second water pump (21) and the input end of the water jacket (23) of the machine body; and / or, A heating device (26) connected in series between the input terminal of the second thermostat (22) and the input terminal of the second water pump (21); and / or, The cylinder head water outlet pipe (27) is connected in series between the output end of the cylinder head water jacket (24) and the input end of the second thermostat (22).

3. The engine cooling system according to claim 1, characterized in that, The accessories (29) include boosters and air compressors connected in series or in parallel.

4. A control method for an engine cooling system, characterized in that, The control method for the engine cooling system is implemented using the engine cooling system according to any one of claims 1-3, and the control method for the engine cooling system includes: S100: Real-time acquisition of the temperature T of the exhaust gas flowing through the EGR cooler (16). 11 The temperature T of the oil after flowing through the oil cooler (18) 21 ; S110: Comparison with T 11 With T 12 The size, and T 21 With T 22 The size of T; where T 12 For the first set temperature, T 22 Set the second temperature; If T 11 ≤T 12 And T 21 >T 22 Then execute S120; S120: Fully open the oil cooler valve (17); S130: Gradually increase the rotational speed of the first water pump (11) from its current position until T 21 ≤T 22 Or the rotational speed of the first water pump (11) is equal to the maximum rotational speed of the first water pump (11); S140: Gradually reduce the opening of the EGR cooler valve (15) until T 11 =T 12 Alternatively, the opening of the EGR cooler valve (15) is zero, and then return to step S100.

5. The control method for the engine cooling system according to claim 4, characterized in that, In step S110, if T 11 >T 12 And T 21 ≤T 22 Then execute S150; S150: Fully open the EGR cooler valve (15); S160: Gradually increase the rotational speed of the first water pump (11) from its current position until T 11 ≤T 12 Or the rotational speed of the first water pump (11) is equal to the maximum rotational speed of the first water pump (11); S170: Gradually reduce the opening of the oil cooler valve (17) until T 21 =T 22 Alternatively, the opening of the oil cooler valve (17) is zero, and then return to step S110.

6. The control method for the engine cooling system according to claim 4, characterized in that, In step S110, if T 11 ≤T 12 And T 21 ≤T 22 Then execute S180; S180: Fully open the EGR cooler valve (15) and the oil cooler valve (17); S190: Determine whether the rotational speed of the first water pump (11) is zero; If yes, then execute S200; otherwise, execute S210. S200: Keep the speed of the first water pump (11) constant, and then return to step S110; S210: Reduce the speed of the first water pump (11) to a first preset value, and then return to step S110.

7. The control method for the engine cooling system according to claim 4, characterized in that, In step S110, if T 11 >T 12 And T 21 >T 22 Then execute S220; S220: Fully open the EGR cooler valve (15) and the oil cooler valve (17); S230: Determine whether the rotational speed of the first water pump (11) is equal to the maximum rotational speed of the first water pump (11); If yes, execute S240; otherwise, execute S250. S240: Keep the speed of the first water pump (11) constant, and then return to step S110; S250: Increase the speed of the first water pump (11) by a second preset value, and then return to step S110.

8. A vehicle, characterized in that, include: One or more processors; Storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors control the vehicle to implement the control method of the engine cooling system as described in any one of claims 4-7.

9. A storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it enables the vehicle to implement the control method of the engine cooling system as described in any one of claims 4-7.

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