Engine cooling system and vehicle

Abstract

The application provides an engine cooling system and a vehicle, and relates to the technical field of engine cooling. The engine cooling system comprises: a water jacket assembly, which is sleeved on an engine; a water pump; a thermostat, which is provided with a water outlet end, a first water inlet end and a second water inlet end, and the water outlet end of the thermostat is connected to the water inlet end of the water jacket assembly through the water pump; a circulation shunt mechanism, which is provided with a water inlet end, a first water outlet end and a second water outlet end, the water inlet end of the circulation shunt mechanism is connected to the water outlet end of the water jacket assembly, and the second water outlet end of the circulation shunt mechanism is connected to the second water inlet end of the thermostat; and a radiator, which is connected to the first water outlet end of the circulation shunt mechanism and the first water inlet end of the thermostat. The engine cooling system can achieve the technical effects of ensuring the stability of engine operation and conveniently adjusting the heat dissipation capacity.

Description

Technical Field

[0001] This application relates to the field of engine cooling technology, and more specifically, to an engine cooling system and a vehicle. Background Technology

[0002] An engine cooling system is a system that uses circulating coolant to remove excess heat generated during engine operation, ensuring that the engine remains within a certain operating temperature range under any operating conditions. Currently, the thermostat in traditional engine cooling systems is generally located at the engine outlet, which can easily lead to temperature fluctuations during engine warm-up. Furthermore, when the thermostat is located at the engine outlet, the circulation loop is relatively simple, making it difficult to adjust the heat dissipation capacity of the engine cooling system. Utility Model Content

[0003] The purpose of this application is to provide an engine cooling system and vehicle that can achieve the technical effects of ensuring stable engine operation and convenient adjustment of heat dissipation capacity.

[0004] In a first aspect, this application provides an engine cooling system, comprising: A water jacket assembly, which is fitted onto the engine; Water pump; A thermostat, which is provided with an outlet, a first inlet, and a second inlet. The outlet of the thermostat is connected to the inlet of the water jacket assembly via the water pump. A circulating diversion mechanism is provided with an inlet end, a first outlet end and a second outlet end. The inlet end of the circulating diversion mechanism is connected to the outlet end of the water jacket assembly, and the second outlet end of the circulating diversion mechanism is connected to the second inlet end of the thermostat. The radiator is connected to the first outlet of the circulation diversion mechanism and the first inlet of the thermostat.

[0005] In the above implementation process, by placing the thermostat at the inlet end of the water jacket assembly, different liquid circulation loops can be formed in conjunction with the first and second outlet ends of the circulation diversion mechanism: when the coolant flows out along the first outlet end of the circulation diversion mechanism, it passes through the radiator; when the coolant flows out along the second outlet end of the circulation diversion mechanism, it does not pass through the radiator. This allows different liquid circulation loops to match the temperature regulation requirements of the engine under different conditions. In particular, placing the thermostat at the inlet end of the water jacket assembly effectively regulates the temperature of the coolant when it enters the water jacket assembly, which can reduce or avoid fluctuations in the engine's operating temperature and ensure the smooth operation of the engine. Thus, this engine cooling system can achieve the technical effects of ensuring the smooth operation of the engine and conveniently adjusting the heat dissipation capacity.

[0006] Furthermore, the engine cooling system also includes a heater core, one end of which is connected between the second outlet of the circulation diversion mechanism and the second inlet of the thermostat, and the other end of which is connected between the thermostat and the water pump. The coolant in the engine cooling system forms a first circulation loop along the first outlet of the circulation diversion mechanism, the radiator, the thermostat, the water pump, and the water jacket assembly. The coolant in the engine cooling system forms a second circulation loop along the second outlet of the circulation diversion mechanism, the heater core / the thermostat, the water pump, and the water jacket assembly.

[0007] In the above-mentioned process, during engine warm-up, when the ambient temperature is low and the coolant flows along the second circulation loop, the coolant can be heated through the heater core and then delivered to the water jacket assembly to supply the engine, greatly shortening the engine preheating time and reducing wear and fuel consumption. When the ambient temperature is high and the coolant flows along the second circulation loop, it can also bypass the heater core and flow directly back to the water jacket assembly through the thermostat, reducing overall operating power consumption. When the coolant flows along the first circulation loop, it is cooled by the radiator, which can dissipate heat from the engine under normal operating conditions, keeping the engine within its operating temperature range and preventing overheating and damage.

[0008] Furthermore, the water jacket assembly includes a cylinder block water jacket and a cylinder head water jacket, and the water pump, the cylinder block water jacket, the cylinder head water jacket, and the water inlet of the circulation diversion mechanism are connected in sequence.

[0009] In the above implementation process, the water jacket assembly is divided into a cylinder block water jacket and a cylinder head water jacket. The cylinder block water jacket and the cylinder head water jacket are connected to the engine by a combination of the two. The coolant flow channels of the cylinder block water jacket and the cylinder head water jacket are connected to realize the circulation of coolant in the cylinder block water jacket and the cylinder head water jacket.

[0010] Furthermore, the engine cooling system also includes an expansion tank, which is connected between the outlet of the cylinder head water jacket and the inlet of the water pump.

[0011] In the above process, the expansion tank can be used to store spare coolant and accommodate excess coolant due to thermal expansion and contraction; when the engine cooling system needs cooling, it can also draw the coolant back into other circulation loops of the engine cooling system, keeping the engine cooling system always full of coolant and avoiding cavitation.

[0012] Furthermore, the engine cooling system also includes an outlet water temperature sensor, which is located at the outlet end of the cylinder head water jacket.

[0013] In the above implementation process, a water temperature sensor is installed at the outlet end of the cylinder head water jacket to detect the outlet water temperature of the cylinder head water jacket. Based on the outlet water temperature, the working status of the engine cooling system is determined, and the heat dissipation power of the engine cooling system is adjusted accordingly.

[0014] Furthermore, the engine cooling system also includes a turbocharger, which is connected between the outlet of the cylinder block water jacket and the inlet of the water pump.

[0015] In the above process, by connecting the turbocharger to the engine cooling system, the coolant can dissipate heat and cool the turbocharger, thereby ensuring the turbocharger's lifespan and reliable operation.

[0016] Furthermore, the engine cooling system also includes an oil cooler, which is connected between the outlet of the water jacket assembly and the inlet of the water pump.

[0017] In the above process, by connecting the oil cooler to the engine cooling system, the coolant can cool and preheat the oil in the oil cooler, thereby ensuring the engine's lifespan and reliable operation.

[0018] Furthermore, the engine cooling system also includes an EGR cooler, which is connected in series with the oil cooler between the outlet of the water jacket assembly and the inlet of the water pump.

[0019] In the above process, the EGR cooler is a heat exchanger installed in the engine's exhaust gas recirculation system. Its core function is to use the engine's coolant to cool the exhaust gas that is about to be reintroduced into the cylinder, which can increase intake air density, improve combustion efficiency, and prevent engine knocking.

[0020] Furthermore, the engine cooling system also includes a differential pressure sensor, which is disposed on the radiator. The first detection port of the differential pressure sensor is disposed at the water inlet of the radiator, and the second detection port of the differential pressure sensor is disposed at the water outlet of the radiator.

[0021] In the above implementation process, differential pressure sensors are installed at the inlet / outlet of the radiator to monitor the pressure difference across the radiator in real time. By comparing the radiator flow rate and differential pressure curve data and performing fitting calculations, the real-time flow rate of the radiator can be obtained. The real-time flow rate is then compared with the heat dissipation map of the engine cooling system's mechanical output. If the flow rate is less than the mechanical output flow rate, the electric water pump increases its duty cycle; if the flow rate is greater than the mechanical output flow rate, the electric water pump decreases its duty cycle, thereby adjusting the radiator's heat dissipation efficiency.

[0022] Secondly, this application provides a vehicle including an engine and an engine cooling system as described in any of the first aspects, wherein a water jacket assembly in the engine cooling system is fitted onto the engine.

[0023] Other features and advantages disclosed in this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology disclosed in this application.

[0024] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of an engine cooling system provided in an embodiment of this application; Figure 2 A schematic diagram of the relationship between radiator pressure difference and radiator flow rate provided in an embodiment of this application.

[0027] Reference numerals: Water jacket assembly 100; Cylinder block water jacket 110; Cylinder head water jacket 120; Water pump 200; Thermostat 300; Circulation splitter mechanism 400; Radiator 500; Differential pressure sensor 510; Heater core 600; Expansion tank 610; Outlet water temperature sensor 620; Turbocharger 630; Oil cooler 640; EGR cooler 650. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0029] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0030] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0031] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0032] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0033] Generally, an engine cooling system is a system that uses circulating coolant to remove excess heat generated during engine operation, ensuring that the engine remains within a certain operating temperature range under any operating conditions. Currently, the thermostat in traditional engine cooling systems is usually located at the engine outlet, which can easily lead to temperature fluctuations during engine warm-up. Furthermore, when the thermostat is located at the engine outlet, the circulation loop is relatively simple, making it difficult to adjust the heat dissipation capacity of the engine cooling system.

[0034] To address the aforementioned technical problems, this application provides an engine cooling system and vehicle. This engine cooling system, by placing the thermostat at the inlet of the water jacket assembly and cooperating with the first and second outlets of the circulation diversion mechanism, can form different liquid circulation loops. These different liquid circulation loops can match the temperature regulation requirements of the engine under different conditions, reducing or preventing fluctuations in the engine's operating temperature and ensuring stable engine operation. Therefore, this engine cooling system can achieve the technical effect of conveniently adjusting heat dissipation capacity.

[0035] Please see Figure 1 , Figure 1 This is a schematic diagram of an engine cooling system provided in an embodiment of this application. The engine cooling system includes: Water jacket assembly 100, which is fitted onto the engine; Water pump 200; The thermostat 300 is provided with an outlet, a first inlet, and a second inlet. The outlet of the thermostat 300 is connected to the inlet of the water jacket assembly 100 via a water pump 200. The circulation diversion mechanism 400 is provided with an inlet end, a first outlet end and a second outlet end. The inlet end of the circulation diversion mechanism 400 is connected to the outlet end of the water jacket assembly 100, and the second outlet end of the circulation diversion mechanism 400 is connected to the second inlet end of the thermostat 300. Radiator 500 is connected to the first outlet of the circulation diversion mechanism 400 and the first inlet of the thermostat 300.

[0036] For example, the water jacket assembly 100 is fitted onto the engine, wherein the engine may be an engine in a conventional fuel vehicle or a hybrid vehicle; this is only an example and not a limitation. The water jacket assembly 100 has coolant channels. Through the connection and contact between the water jacket assembly 100 and the engine, the coolant channels in the water jacket assembly 100 can exchange heat with the engine, thereby regulating the engine temperature to keep the engine within a certain operating temperature range and ensuring the normal operation of the engine.

[0037] For example, the water pump 200 generates pressure to drive the coolant to circulate continuously in the pipes of the entire engine cooling system; optionally, the water pump 200 can be an electric pump (electronic water pump), an engine-driven pump, a hydraulic-driven pump, a pneumatic pump, etc.; for ease of description, the water pump 200 in this embodiment is exemplified by an electronic water pump, which does not represent a limitation on the type of water pump 200.

[0038] For example, the thermostat 300 has two water inlet ports: a first water inlet and a second water inlet, through which the flow direction and circulation path of the coolant can be controlled; Optionally, while engines generate a significant amount of heat during operation, colder isn't always better. Engines have an optimal operating temperature range (typically 85°C to 95°C) where fuel atomization is better, wear is minimal, and operating efficiency is highest; the thermostat 300 exists to achieve this goal. When the engine is cold-started (at low temperatures): the first inlet of the thermostat is closed and the second inlet is open; at this time, the thermostat blocks the flow of coolant to the radiator 500 (large circulation), allowing the coolant to flow only within the engine (small circulation). This can greatly shorten the engine warm-up time, reduce wear and fuel consumption; When the engine reaches operating temperature (high temperature): When the coolant temperature rises to a set value (e.g., 82°C or 88°C), the first inlet of the thermostat 300 opens and the second inlet closes. At this time, the coolant begins to flow to the radiator 500, maintaining the engine within a certain operating temperature range (large circulation).

[0039] Optionally, the thermostat 300 is temperature-adjustable: the thermostat dynamically adjusts the opening of the valves (outlet, first inlet, and second inlet) according to changes in water temperature, thereby precisely controlling the flow of coolant participating in the large circulation and keeping the engine temperature stable within the optimal range.

[0040] For example, the thermostat 300 is an automatic temperature regulating valve in the engine cooling system. The core function of the thermostat 300 is to control the flow path of the coolant in the engine cooling system, thereby ensuring that the engine can heat up quickly and maintain the optimal operating temperature. It can also cool down the engine during operation to prevent the engine from overheating and being damaged.

[0041] For example, the circulation diversion mechanism 400 is disposed at the outlet end of the water jacket assembly 100, and the circulation diversion mechanism 400 is configured with a first outlet end and a second outlet end, which cooperate with the thermostat 300 disposed at the inlet end of the water jacket assembly 100 to control the flow direction and circulation path of the coolant.

[0042] For example, the engine cooling system provided in this application embodiment has the thermostat 300 set at the water inlet of the water jacket assembly 100, which can more effectively control the temperature of the coolant entering the water jacket assembly 100 during the engine warm-up process, avoid temperature fluctuations in the engine during the warm-up process, and ensure the smooth operation of the engine.

[0043] For example, the radiator 500 serves as a heat exchanger for the engine cooling system; optionally, the radiator 500 is equipped with a radiator tank and a fan. The radiator tank includes many cooling pipes and fins, and has a large heat dissipation area. When hot coolant flows through it, the fan and natural wind during driving will carry away its heat, cooling the coolant. The cooled coolant will then be used to dissipate heat from the engine, maintaining the engine's operating temperature and preventing the engine from overheating.

[0044] The engine cooling system provided in this application embodiment can form different liquid circulation loops by placing the thermostat 300 at the water inlet end of the water jacket assembly 100 and cooperating with the first and second outlet ends of the circulation diversion mechanism 400: when the coolant flows out along the first outlet end of the circulation diversion mechanism 400, it passes through the radiator 500; when the coolant flows out along the second outlet end of the circulation diversion mechanism 400, it does not pass through the radiator 500. This allows different liquid circulation loops to match the temperature regulation requirements of the engine under different conditions. In particular, placing the thermostat 300 at the water inlet end of the water jacket assembly 100 effectively regulates the temperature of the coolant when it enters the water jacket assembly 100, which can reduce or avoid fluctuations in the engine's operating temperature and ensure the smooth operation of the engine. Thus, this engine cooling system can achieve the technical effect of conveniently adjusting the heat dissipation capacity.

[0045] In some embodiments, the engine cooling system further includes a heater core 600, one end of which is connected between the second outlet of the circulation diversion mechanism 400 and the second inlet of the thermostat 300, and the other end of which is connected between the thermostat 300 and the water pump 200. The coolant in the engine cooling system forms a first circulation loop along the first outlet of the circulation diversion mechanism 400, the radiator 500, the thermostat 300, the water pump 200, and the water jacket assembly 100. The coolant in the engine cooling system forms a second circulation loop along the second outlet of the circulation diversion mechanism 400, the heater core 600 / thermostat 300, the water pump 200, and the water jacket assembly 100.

[0046] For example, during engine warm-up, when the ambient temperature is low and the coolant flows along the second circulation loop, the coolant can be heated by the heater core 600 and then delivered to the water jacket assembly 100 to supply the engine, greatly shortening the engine preheating time and reducing wear and fuel consumption. When the ambient temperature is high and the coolant flows along the second circulation loop, it can also bypass the heater core 600 and flow directly back to the water jacket assembly 100 through the thermostat 300, reducing overall operating power consumption. When the coolant flows along the first circulation loop, it is cooled by the radiator 500, which can dissipate heat from the engine under normal operating conditions, keeping the engine within its operating temperature range and preventing overheating and damage.

[0047] Optionally, during engine warm-up, the coolant can bypass the radiator 500. The coolant in the water jacket assembly 100 flows through the circulation diversion mechanism 400, thermostat 300, heater core 600 and water pump 200, and delivers the coolant heated by the heater core 600 to the water jacket assembly 100 to the engine to preheat the engine and reduce the preheating time. When the engine is running normally, after the engine has warmed up, the first water inlet of the thermostat 300 is open and the second water inlet is closed. Most of the coolant coming out of the water jacket assembly 100 flows through the radiator 500 for heat dissipation and then returns to the thermostat 300, and finally enters the water pump 200 to complete the circulation. Under this condition, a small portion of the coolant flows through the heater core 600, which can heat the entire vehicle's passenger compartment.

[0048] For example, the heater core 600 is the core component of the car heating system. The heater core 600 functions like a small radiator, which can "transfer" the heat of the engine coolant to the car interior, thereby providing warm air to the cabin. At the same time, the heater core 600 can also heat the coolant, shortening the engine warm-up time during the engine warm-up phase.

[0049] In some embodiments, the water jacket assembly 100 includes a cylinder block water jacket 110 and a cylinder head water jacket 120, with the water pump 200, cylinder block water jacket 110, cylinder head water jacket 120, and the water inlet of the circulation diversion mechanism 400 connected in sequence.

[0050] For example, the water jacket assembly 100 is divided into a cylinder block water jacket 110 and a cylinder head water jacket 120. The cylinder block water jacket 110 and the cylinder head water jacket 120 are connected to the engine by a combination of the cylinder block water jacket 110 and the cylinder head water jacket 120. The coolant flow channels of the cylinder block water jacket 110 and the cylinder head water jacket 120 are connected to realize the circulation of coolant in the cylinder block water jacket 110 and the cylinder head water jacket 120.

[0051] In some embodiments, the engine cooling system also includes an expansion tank 610, which is connected between the outlet of the cylinder head water jacket 120 and the inlet of the water pump 200.

[0052] For example, the expansion tank 610 can be used to store spare coolant and accommodate excess coolant due to thermal expansion and contraction; when the engine cooling system needs cooling, it can also draw the coolant back into other circulation loops of the engine cooling system, keeping the engine cooling system always full of coolant and preventing cavitation.

[0053] In some embodiments, the engine cooling system also includes an outlet water temperature sensor 620, which is located at the outlet end of the cylinder head water jacket 120.

[0054] For example, a water temperature sensor 620 is installed at the outlet end of the cylinder head water jacket to detect the outlet water temperature of the cylinder head water jacket. The operating status of the engine cooling system is determined based on the outlet water temperature, and the heat dissipation power of the engine cooling system is adjusted accordingly.

[0055] In some implementation scenarios, the engine cooling system can adjust the heat dissipation power of the engine cooling system by adjusting the power of the water pump, the speed of the electric fan of the radiator, and other methods.

[0056] In some embodiments, the engine cooling system also includes a turbocharger 630 connected between the outlet of the cylinder block water jacket 110 and the inlet of the water pump 200.

[0057] For example, by connecting the turbocharger 630 to the engine cooling system, the turbocharger 630 can be cooled by the coolant, thereby ensuring the lifespan and reliable operation of the turbocharger 630.

[0058] For example, turbocharger 630 is a device that uses the energy of engine exhaust gas as power to force more air into the engine cylinders.

[0059] In some embodiments, the engine cooling system further includes an oil cooler 640, which is connected between the outlet of the water jacket assembly 100 and the inlet of the water pump 200.

[0060] For example, by connecting the oil cooler 640 to the engine cooling system, the oil in the oil cooler 640 can be cooled and preheated by the coolant, thereby ensuring the engine's lifespan and reliable operation.

[0061] For example, the oil cooler 640 is a heat exchanger between the engine lubrication system and the engine cooling system. It can be compared to an "air conditioner" that serves the oil, using the coolant from the engine cooling system to cool and preheat the oil, ensuring that the oil is always kept within its optimal operating temperature range.

[0062] In some embodiments, the engine cooling system also includes an EGR cooler 650, which is connected in series with the oil cooler 640 between the outlet of the water jacket assembly 100 and the inlet of the water pump 200.

[0063] For example, the EGR cooler 650 is a heat exchanger installed in the exhaust gas recirculation (EGR) system of the engine. Its core function is to use the engine's coolant to cool the exhaust gas that is about to be reintroduced into the cylinder, which can increase intake air density, improve combustion efficiency and prevent engine knock.

[0064] For example, exhaust gas recirculation (EGR) is a technology in small internal combustion engines for automobiles that allows a portion of the exhaust gases to be expelled after combustion and reintroduced into the intake side for re-inhalation; the main purpose of exhaust gas recirculation is to reduce nitrogen oxides (NOx) in the exhaust gases and improve fuel economy under partial load.

[0065] Please see Figure 2 , Figure 2 A schematic diagram of the relationship between radiator pressure difference and radiator flow rate provided in an embodiment of this application; wherein, according to Figure 2 The flow rate and pressure difference curve data of the radiator can be determined.

[0066] In some embodiments, the engine cooling system further includes a differential pressure sensor 510, which is disposed on the radiator 500. The first detection port of the differential pressure sensor 510 is disposed on the water inlet of the radiator 500, and the second detection port of the differential pressure sensor 510 is disposed on the water outlet of the radiator 500.

[0067] For example, differential pressure sensors 510 are arranged at the inlet / outlet of the radiator 500 to monitor the pressure difference across the radiator 500 in real time. By comparing the radiator flow rate and differential pressure curve data and performing fitting calculations, the real-time flow rate of the radiator can be obtained. The real-time flow rate is then compared with the heat dissipation map of the engine cooling system's mechanical output. If the flow rate is less than the mechanical output flow rate, the electric water pump increases its duty cycle; if the flow rate is greater than the mechanical output flow rate, the electric water pump decreases its duty cycle, thereby adjusting the radiator's heat dissipation efficiency.

[0068] In some implementation scenarios, when the radiator detects that its own flow rate has reached the maximum design value, it means that the water pump 200 has reached its limit. At this time, it is necessary to increase the speed of the electric fan of the radiator 500 to cool the engine and ensure that the engine's outlet water temperature is below 115℃.

[0069] For example, the heat dissipation MAP, also known as the heat load MAP or heat dissipation demand MAP, can be in the form of a three-dimensional data table or graph, used to describe the total heat that the engine needs to dissipate by the cooling system under different operating conditions; the mechanical development flow rate refers to the minimum coolant flow rate that must be achieved in the engine's mechanically driven (usually crankshaft driving water pump via belt) cooling system in order to meet the needs of all operating conditions (especially the maximum heat dissipation point) in the above heat dissipation MAP.

[0070] In some implementation scenarios, this application provides a vehicle including an engine and Figure 1 The engine cooling system shown has a water jacket assembly that is fitted onto the engine.

[0071] In some implementation scenarios, combined with Figure 1 The engine cooling system shown can be divided into two types: a small loop (not passing through the radiator) and a large loop (passing through the radiator). Generally, the small loop is used for cold starts, and the large loop is used when the engine is running normally. Small loops include: Water pump 200 → Cylinder block water jacket 110 → Cylinder head water jacket 120 → Water temperature sensor 620 → Circulation diversion mechanism 400 → Thermostat 300 → Water pump 200; Water pump 200 → Cylinder block water jacket 110 → Cylinder head water jacket 120 → Expansion tank 610 → Water pump 200; Water pump 200 → Cylinder block water jacket 110 → Cylinder head water jacket 120 → Water temperature sensor 620 → Circulation diversion mechanism 400 → Heater core 600 → Water pump 200; Water pump 200 → Cylinder block water jacket 110 → Oil cooler 640 → EGR cooler 650 → Water pump 200; Water pump 200 → Cylinder block water jacket 110 → Turbocharger 630 → Water pump 200.

[0072] Large loop: Water pump 200 → Cylinder block water jacket 110 → Cylinder head water jacket 120 → Water temperature sensor 620 → Circulation diversion mechanism 400 → Radiator 500 → Thermostat 300 → Water pump 200. Water pump 200 → Cylinder block water jacket 110 → Cylinder head water jacket 120 → Expansion tank 610 → Water pump 200; Water pump 200 → Cylinder block water jacket 110 → Cylinder head water jacket 120 → Water temperature sensor 620 → Circulation diversion mechanism 400 → Heater core 600 → Water pump 200; Water pump 200 → Cylinder block water jacket 110 → Oil cooler 640 → EGR cooler 650 → Water pump 200; Water pump 200 → Cylinder block water jacket 110 → Turbocharger 630 → Water pump 200.

[0073] For example, the engine cooling system provided in this application embodiment is specifically implemented as follows: A circulation diversion mechanism 400 is arranged at the water outlet end of the water jacket assembly 100, and a temperature sensor is installed thereon. The flow ratio of the radiator 500, the small circulation, and the warm air core 600 can be determined by using the inner diameter of the circulation diversion mechanism 400. A dual-valve thermostat is installed inside the thermostat 300 housing. Before the engine warms up, the second water inlet of the thermostat 300 is open and the first water inlet is closed. Thus, the coolant at the outlet of the water jacket assembly 100 only flows through the heater core 600 and the small circulation loop. After the engine warms up, the first water inlet is open and the second water inlet is closed. Most of the coolant at the outlet of the water jacket assembly 100 flows through the radiator for heat dissipation and returns to the thermostat housing before finally entering the water pump for circulation. Under this condition, a small portion of the coolant flow passes through the heater core to heat the entire vehicle's passenger compartment. Differential pressure sensors are installed at the inlet and outlet of radiator 500 to monitor the pressure difference across radiator 500 in real time. The real-time flow rate of the radiator is obtained by fitting the radiator flow rate differential pressure curve data (internal data of ECU) to the data. This flow rate is compared with the heat dissipation map of the engine cooling system mechanical development. If the flow rate is less than the mechanical development flow rate, the electric water pump increases the duty cycle; if the flow rate is greater than the mechanical development flow rate, the electric water pump decreases the duty cycle. The engine cooling capacity is adjusted and controlled from the logic terminal.

[0074] By way of example, the engine cooling system provided in this application embodiment has at least the following beneficial effects: The engine cooling system adjusts the thermostat to the water pump inlet, which can reduce or avoid temperature fluctuations in the cylinder block and cylinder head, ensuring stable engine operation. The engine cooling system places a differential pressure sensor at both the inlet and outlet of the radiator to monitor the pressure difference across the radiator and calculate the radiator flow rate based on the radiator flow resistance curve data built into the ECU. Engine operating conditions can be obtained from ECU data, including engine speed and output torque. The engine cooling power can be obtained from the engine cooling power map under the current operating conditions.

[0075] It should be understood that the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0076] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0077] The above description is merely a specific embodiment of this application, but the scope of protection of this application 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 this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

1. An engine cooling system, characterized in that, include: A water jacket assembly, which is fitted onto the engine; Water pump; A thermostat, which is provided with an outlet, a first inlet, and a second inlet. The outlet of the thermostat is connected to the inlet of the water jacket assembly via the water pump. A circulating diversion mechanism is provided with an inlet end, a first outlet end and a second outlet end. The inlet end of the circulating diversion mechanism is connected to the outlet end of the water jacket assembly, and the second outlet end of the circulating diversion mechanism is connected to the second inlet end of the thermostat. The radiator is connected to the first outlet of the circulation diversion mechanism and the first inlet of the thermostat.

2. The engine cooling system according to claim 1, characterized in that, The engine cooling system also includes a heater core, one end of which is connected between the second outlet of the circulation diversion mechanism and the second inlet of the thermostat, and the other end of which is connected between the thermostat and the water pump. The coolant in the engine cooling system forms a first circulation loop along the first outlet of the circulation diversion mechanism, the radiator, the thermostat, the water pump, and the water jacket assembly. The coolant in the engine cooling system forms a second circulation loop along the second outlet of the circulation diversion mechanism, the heater core / the thermostat, the water pump, and the water jacket assembly.

3. The engine cooling system according to claim 1 or 2, characterized in that, The water jacket assembly includes a cylinder block water jacket and a cylinder head water jacket, and the water pump, the cylinder block water jacket, the cylinder head water jacket, and the water inlet of the circulation diversion mechanism are connected in sequence.

4. The engine cooling system according to claim 3, characterized in that, The engine cooling system also includes an expansion tank, which is connected between the outlet of the cylinder head water jacket and the inlet of the water pump.

5. The engine cooling system according to claim 4, characterized in that, The engine cooling system also includes an outlet water temperature sensor, which is located at the outlet end of the cylinder head water jacket.

6. The engine cooling system according to claim 3, characterized in that, The engine cooling system also includes a turbocharger, which is connected between the outlet of the cylinder block water jacket and the inlet of the water pump.

7. The engine cooling system according to claim 1, characterized in that, The engine cooling system also includes an oil cooler, which is connected between the outlet of the water jacket assembly and the inlet of the water pump.

8. The engine cooling system according to claim 7, characterized in that, The engine cooling system also includes an EGR cooler, which is connected in series with the oil cooler between the outlet of the water jacket assembly and the inlet of the water pump.

9. The engine cooling system according to claim 1, characterized in that, The engine cooling system also includes a differential pressure sensor, which is disposed on the radiator. The first detection port of the differential pressure sensor is disposed at the water inlet of the radiator, and the second detection port of the differential pressure sensor is disposed at the water outlet of the radiator.

10. A vehicle, characterized in that, It includes an engine and an engine cooling system as described in any one of claims 1 to 9, wherein a water jacket assembly in the engine cooling system is fitted onto the engine.

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