Engine cooling system

Abstract

The invention relates to an engine cooling system which comprises a main electronic water pump, a cylinder body, an engine oil cooler and an EGR cooler, the engine oil cooler and the EGR cooler are arranged in series, the cylinder body is provided with at least two water outlet ends, the water outlet end of one cylinder body communicates with the engine oil cooler, and the water outlet end of the other cylinder body communicates with the water outlet end of the EGR cooler. The water outlet end of the engine oil cooler communicates with the water inlet end of the EGR cooler, the engine oil cooler is used for cooling engine oil flowing out of the cylinder body, the EGR cooler is used for heating cooling liquid flowing out of the engine oil cooler, and the main electronic water pump is used for pressurizing the cooling liquid to enable the cooling liquid to flow. The engine oil cooler is adopted to take water in the cylinder body, then all the water flows through the EGR cooler, one path of parallel circulation is reduced, the total flow of a water pump is reduced, the energy consumption of the water pump is reduced, and therefore the heat efficiency of an engine is improved, and the energy-saving effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of engines, and in particular to an engine cooling system. Background Art

[0002] The existing engine cooling system supercharger water inlet is located near the back of the water pump to ensure a high water pressure, but the supercharger return water interface is generally connected to the water pump inlet pipe. In this way, the cooling water pump needs to meet the flow of the cylinder head water jacket, the EGR cooler flow and the oil cooler flow at the same time, and also needs to meet the flow of the supercharger and the expansion kettle. The total required flow is large, the required cooling water pump performance is high, the engine power consumed is large, and the total fuel consumption of the engine is increased.

[0003] Therefore, how to reduce the overall flow and energy consumption of the water pump, improve the thermal efficiency of the engine, and reduce the engine fuel consumption. Summary of the invention

[0004] In view of this, the present invention provides an engine cooling system, which adopts an oil cooler to take water from the cylinder water jacket, and then all the water flows through the EGR cooler, thereby reducing one parallel circulation, reducing the overall flow of the water pump, and reducing the energy consumption of the water pump, thereby improving the thermal efficiency of the engine and achieving an energy-saving effect.

[0005] The present invention provides an engine cooling system that adopts the following technical solution:

[0006] An engine cooling system comprises a main electronic water pump, a cylinder body, an oil cooler and an EGR cooler, wherein the oil cooler and the EGR cooler are arranged in series, the cylinder body has at least two water outlets, one water outlet of the cylinder body is in communication with the oil cooler, the other water outlet of the cylinder body is in communication with the water outlet of the EGR cooler, the water outlet of the oil cooler is in communication with the water inlet of the EGR cooler, the oil cooler is used to cool the oil flowing out of the cylinder body, the EGR cooler is used to heat the coolant flowing out of the oil cooler, and the main electronic water pump is used to pressurize the coolant to make it flow.

[0007] Optionally, the cylinder block includes a cylinder block water jacket and a cylinder head water jacket, the cylinder block water jacket having at least one water outlet end, the water outlet end of the cylinder block water jacket communicating with an oil cooler, and the cylinder head water jacket having a water outlet end, the water outlet end of the cylinder head water jacket communicating with a water outlet end of an EGR cooler.

[0008] Optionally, it also includes a supercharger and an expansion kettle, wherein the supercharger is in communication with the water outlet of the cylinder water jacket, the supercharger has a supercharger return pipe, the supercharger return pipe is in communication with the water inlet of the expansion kettle, and the water outlet of the expansion kettle is in communication with the main electronic water pump.

[0009] Optionally, it also includes a cylinder head degassing pipe arranged on the cylinder body, and the supercharger return pipe and the degassing pipe are connected and flow through the water inlet of the expansion kettle.

[0010] Optionally, the cylinder head water jacket has two water outlet ends, one water outlet end of the cylinder head water jacket is in communication with the water inlet end of the expansion kettle, and the other water outlet end of the cylinder head water jacket is in communication with the expansion kettle.

[0011] Optionally, a thermostat is also included, wherein the water inlet end of the thermostat is respectively connected to the water outlet end of the EGR cooler and the water outlet end of the cylinder head water jacket, and the water outlet end of the thermostat is respectively connected to the water inlet end of the radiator and the main electronic water pump.

[0012] Optionally, a radiator is also included, and the radiator is in communication with the water outlet of the thermostat and the water inlet of the main electronic water pump respectively.

[0013] Optionally, the thermostat includes a thermostat cavity and a thermostat temperature sensor, the thermostat cavity is used to contain engine oil, and the thermostat temperature sensor is used to detect the temperature of the engine oil in the thermostat cavity.

[0014] Optionally, a water outlet temperature sensor is provided between the thermostat and the main electronic water pump, and the water outlet temperature sensor is used to detect the temperature of the engine oil flowing from the thermostat into the main electronic water pump.

[0015] Optionally, it also includes a warm air bypass pipe and a bypass, wherein an auxiliary electronic water pump, a WPTC and a warm air core are sequentially arranged on the bypass, the water inlet end of the warm air bypass pipe is respectively communicated with the water outlet end of the thermostat and the water inlet end of the bypass, and a three-way valve is arranged on the bypass, the three-way valve has a water outlet end one and a water outlet end two, the water outlet end one merges with the water outlet end of the warm air bypass pipe and the water outlet end of the expansion kettle and then flows into the main electronic water pump, the water outlet end two of the three-way valve is communicated with the water inlet end of the warm air bypass pipe, and the water outlet end of the warm air core is communicated with the water inlet end of the valve.

[0016] In summary, the present invention includes at least one of the following beneficial technical effects: an oil cooler is used to draw water from the cylinder body, and then all of it flows through the EGR cooler, thereby reducing one parallel circulation, reducing the overall flow of the water pump, and reducing the energy consumption of the water pump, thereby improving the thermal efficiency of the engine and achieving energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0019] Explanation of the reference numerals: 1. Main electronic water pump; 2. Cylinder water jacket; 3. Cylinder head water jacket; 4. Oil cooler; 5. EGR cooler; 6. Turbocharger; 7. Expansion kettle; 8. Thermostat; 9. Radiator; 10. Water outlet temperature sensor; 11. Warm air bypass pipe; 12. Auxiliary electronic water pump; 13. WPTC; 14. Warm air core; 15. Three-way valve; 16. Cylinder. DETAILED DESCRIPTION

[0020] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0021] The following is combined with Figure 1 The present invention is described in further detail.

[0022] An embodiment of the invention discloses an engine cooling system.

[0023] Reference Figure 1 An engine cooling system includes a main electronic water pump 1, a cylinder 16, an oil cooler 4 and an EGR cooler 5. The oil cooler 4 and the EGR cooler 5 are arranged in series. The cylinder 16 has at least two water outlets. The water outlet of one cylinder 16 is in communication with the oil cooler 4, and the water outlet of the other cylinder 16 is in communication with the water outlet of the EGR cooler 5. The water outlet of the oil cooler 4 is in communication with the water inlet of the EGR cooler 5. The oil cooler 4 is used to cool the oil flowing out of the cylinder 16, and the EGR cooler 5 is used to heat the coolant flowing out of the oil cooler 4. The main electronic water pump 1 is used to pressurize the coolant to make the coolant flow. The oil cooler 4 is used to take water in the cylinder 16, and then all of it flows through the EGR cooler 5, which reduces one parallel cycle, reduces the overall flow of the water pump, and reduces the energy consumption of the water pump, thereby improving the thermal efficiency of the engine and playing a role in energy saving.

[0024] The cylinder block 16 includes a cylinder block water jacket 2 and a cylinder head water jacket 3 . The cylinder block water jacket 2 has at least one water outlet end, and the water outlet end of the cylinder block water jacket 2 is in communication with the oil cooler 4 . The cylinder head water jacket 3 has a water outlet end, and the water outlet end of the cylinder head water jacket 3 is in communication with the water outlet end of the EGR cooler 5 . The oil cooler 4 draws water from the low-temperature cylinder water jacket 2, and can effectively use the low-temperature water of the cooling system to cool the oil, which can effectively control the oil temperature and improve the heat dissipation performance. In addition, the EGR cooler 5 draws water from behind the oil cooler 4. The oil cooler 4 heats the coolant, thereby increasing the water inlet temperature of the EGR cooler 5, thereby reducing the risk of coking in the gas path of the EGR cooler 5 (the coking principle is the heat exchange between high-temperature gas and low-temperature wall, and the greater the temperature difference, the greater the coking risk). Since the EGR cooler 5 is connected in series with the oil cooler 4, the flow consumption of one cooling cycle is saved, thereby reducing the flow performance requirement of the cooling water pump, and the shaft power of the cooling water pump is reduced, thereby reducing the total fuel consumption of the engine and improving the thermal efficiency of the engine.

[0025] It also includes a supercharger and an expansion kettle 7. The supercharger adopts a turbocharger 6. The turbocharger 6 is in communication with the water outlet of the cylinder water jacket 2. The turbocharger 6 has a supercharger return pipe. The supercharger return pipe is in communication with the water inlet of the expansion kettle 7. The water outlet of the expansion kettle 7 is in communication with the main electronic water pump 1. The supercharger return pipe connection is changed from the traditional water pump inlet pipe to a direct connection with the expansion kettle 7, which can meet the degassing requirements of the cylinder head water jacket 3 and the supercharger. The cooling system saves a supercharger return pipe, saves component costs, improves the system degassing capacity, and reduces the flow demand of the water pump.

[0026] It also includes a cylinder head degassing pipe arranged on the cylinder body 16, and the supercharger return pipe and the degassing pipe are connected to the water inlet of the expansion kettle 7, and the cylinder head degassing pipe and the supercharger return pipe are connected to the water inlet of the expansion kettle 7 to jointly maintain the normal operation of the cooling system. After the supercharger return pipe and the cylinder head degassing pipe are connected, they are connected to the water inlet of the expansion kettle 7 to form a circulation system to ensure the cooling effect.

[0027] The cylinder head water jacket 3 has two water outlets, one of which is in communication with the water inlet of the expansion water pot 7, and the other of which is in communication with the expansion water pot 7. The water outlet of one cylinder head water jacket 3 is connected to the water inlet of the expansion water pot 7 to ensure that the coolant can flow smoothly into the expansion water pot 7; the water outlet of the other cylinder head water jacket 3 is directly connected to the expansion water pot 7. Such a design helps to maintain the pressure of the cooling system and the circulation of the coolant, so as to realize the circulation and regulation of the coolant. The expansion water pot 7 plays the role of storing the coolant expanded due to the temperature rise in the automobile cooling system, and the water level of the cooling water can also be checked through the scale on it.

[0028] The expansion kettle 7 is used to receive the coolant reflux from the supercharger and the cylinder head to meet the degassing requirements.

[0029] The thermostat 8 temperature sensor and the water temperature sensor temperature sensor are used to monitor and control the coolant temperature to ensure that the cooling system works as required.

[0030] It also includes a thermostat 8, the water inlet of the thermostat 8 is connected to the water outlet of the EGR cooler 5 and the water outlet of the cylinder head water jacket 3, and the water outlet of the thermostat 8 is connected to the radiator 9 and the water inlet of the main electronic water pump 1. The thermostat 8 is an automatic temperature regulating device for controlling the flow path of the coolant. It automatically adjusts the amount of water entering the radiator 9 according to the temperature of the engine cooling water to ensure that the engine works within a suitable temperature range. The thermostat 8 controls the flow path of the coolant through the thermal expansion and contraction of the temperature sensing component. At low temperatures, the coolant performs a small circulation; at high temperatures, the coolant performs a large circulation and flows through the radiator 9 to dissipate heat.

[0031] It also includes a radiator 9, which is in communication with the water outlet of the thermostat 8 and the water inlet of the main electronic water pump 1 respectively.

[0032] The thermostat 8 includes a thermostat 8 cavity and a thermostat 8 temperature sensor. The thermostat 8 cavity is used to contain engine oil, and the thermostat 8 temperature sensor is used to detect the temperature of the engine oil in the thermostat 8 cavity.

[0033] An outlet water temperature sensor 10 is provided between the thermostat 8 and the main electronic water pump 1. The outlet water temperature sensor 10 is used to detect the temperature of the oil flowing from the thermostat 8 to the main electronic water pump 1. The outlet water temperature sensor 10 is provided between the thermostat 8 and the main electronic water pump 1. The outlet water temperature sensor 10 is used to detect the temperature of the oil flowing from the thermostat 8 to the main electronic water pump 1 to prevent the oil from overheating and causing performance degradation or damage.

[0034] It also includes a warm air bypass pipe 11 and a bypass, on which an auxiliary electronic water pump 12, a WPTC 13 and a warm air core 14 are arranged in sequence, the water inlet end of the warm air bypass pipe 11 is respectively in communication with the water outlet end of the thermostat 8 and the water inlet end of the bypass, a three-way valve 15 is arranged on the bypass, and the three-way valve 15 has a first water outlet end and a second water outlet end, the first water outlet end merges with the water outlet end of the warm air bypass pipe 11 and the water outlet end of the expansion kettle 7 and then flows into the main electronic water pump 1, the second water outlet end of the three-way valve 15 is in communication with the water inlet end of the warm air bypass pipe 11, and the water outlet end of the warm air core 14 is in communication with the water inlet end of the valve. The three-way valve 15 adopts a proportional three-way valve 15.

[0035] The diameter of the heater bypass pipe 11 is larger than the diameter of the bypass. When the auxiliary electronic water pump 12 is started, part of the coolant from the thermostat 8 passes through the WPTC13 and the heater core 14. The flow rate at the outlet of the three-way valve 15 is controlled according to demand to control the coolant flow to the water inlet or outlet of the heater bypass pipe 11. A set of engine cooling system can ensure efficient and stable operation of the engine and the car heater, and improve applicability.

[0036] In this embodiment, WPTC13 is an electric heating technology applied to the automobile heating system. WPTC13 generates heat through electrothermal conversion to heat the coolant, and then transfers the heat to the heater core 14 in the air-conditioning box, and finally heats the air in the passenger compartment.

[0037] The present invention sets the water intake point of the oil cooler 4 at the cylinder water jacket 2, and then the coolant flows through the EGR cooler 5, thereby reducing the parallel circulation and the total flow demand of the cooling water pump. The return pipe of the supercharger is directly connected to the expansion kettle 7 instead of the traditional water pump water inlet pipe, so as to meet the degassing requirements of the cylinder head and the supercharger, and save a supercharger return pipe.

[0038] The present invention optimizes cooling efficiency and reduces coking risk by connecting the oil cooler 4 and the EGR cooler 5 in series.

[0039] In this embodiment, the small cycle condition is:

[0040] Water circulation route:

[0041] Main electronic water pump 1 → cylinder water jacket 2 → cylinder head water jacket 3 → thermostat 8 cavity → thermostat 8 temperature sensing body → water temperature sensor temperature sensing body → heater core 14 → main electronic water pump 1 inlet.

[0042] Main electronic water pump 1 → cylinder water jacket 2 → cylinder head water jacket 3 → thermostat 8 cavity → thermostat 8 temperature sensing body → water temperature sensor temperature sensing body → bypass pipe (heater core 14) → main electronic water pump 1 inlet.

[0043] Main electronic water pump 1 → cylinder water jacket 2 → oil cooler 4 → EGR cooler 5 → thermostat 8 cavity → thermostat 8 temperature sensor → water temperature sensor → heater core 14 → main electronic water pump 1 inlet.

[0044] Main electronic water pump 1 → cylinder water jacket 2 → supercharger water jacket → expansion kettle 7 → main electronic water pump 1 inlet.

[0045] Main electronic water pump 1 → cylinder water jacket 2 → cylinder head water jacket 3 → cylinder head degassing pipe → expansion kettle 7 → main electronic water pump 1 inlet.

[0046] Large cycle conditions:

[0047] Water circulation route:

[0048] Main electronic water pump 1 → cylinder water jacket 2 → cylinder head water jacket 3 → thermostat 8 cavity → thermostat 8 temperature sensing body → water temperature sensor temperature sensing body → heater core 14 → main electronic water pump 1 inlet.

[0049] Main electronic water pump 1 → cylinder water jacket 2 → cylinder head water jacket 3 → thermostat 8 cavity → thermostat 8 temperature sensor → high temperature radiator 9 → main electronic water pump 1 inlet.

[0050] Main electronic water pump 1 → cylinder water jacket 2 → oil cooler 4 → EGR cooler 5 → thermostat 8 cavity → thermostat 8 temperature sensor → water temperature sensor → heater core 14 → main electronic water pump 1 inlet.

[0051] Main electronic water pump 1 → cylinder water jacket 2 → supercharger water jacket → expansion kettle 7 → main electronic water pump 1 inlet.

[0052] Main electronic water pump 1 → cylinder water jacket 2 → cylinder head water jacket 3 → cylinder head degassing pipe → expansion kettle 7 → main electronic water pump 1 inlet.

[0053] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements, modifications or changes can be made, and the above technical features can be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. An engine cooling system, characterized in that: It includes a main electronic water pump, a cylinder body, an oil cooler and an EGR cooler. The oil cooler and the EGR cooler are arranged in series. The cylinder body has at least two water outlets, one water outlet of the cylinder body is in communication with the oil cooler, and the other water outlet of the cylinder body is in communication with the water outlet of the EGR cooler. The water outlet of the oil cooler is in communication with the water inlet of the EGR cooler. The oil cooler is used to cool the oil flowing out of the cylinder body, the EGR cooler is used to heat the coolant flowing out of the oil cooler, and the main electronic water pump is used to pressurize the coolant to make the coolant flow.

2. The engine cooling system according to claim 1, characterized in that: The cylinder block includes a cylinder block water jacket and a cylinder head water jacket, the cylinder block water jacket has at least one water outlet end, the water outlet end of the cylinder block water jacket is in communication with an oil cooler, and the cylinder head water jacket has a water outlet end, the water outlet end of the cylinder head water jacket is in communication with a water outlet end of an EGR cooler.

3. The engine cooling system according to claim 2, characterized in that: It also includes a supercharger and an expansion water tank. The supercharger is in communication with the water outlet of the cylinder water jacket. The supercharger has a supercharger return pipe, which is in communication with the water inlet of the expansion water tank. The water outlet of the expansion water tank is in communication with the main electronic water pump.

4. The engine cooling system according to claim 3, characterized in that: It also includes a cylinder head degassing pipe arranged on the cylinder body, and the supercharger return pipe and the degassing pipe are connected to the water inlet of the expansion kettle.

5. The engine cooling system according to claim 3, characterized in that: The cylinder head water jacket has two water outlet ends, one of the water outlet ends of the cylinder head water jacket is in communication with the water inlet end of the expansion kettle, and the other water outlet end of the cylinder head water jacket is in communication with the expansion kettle.

6. The engine cooling system according to claim 2, characterized in that: It also includes a thermostat, the water inlet end of the thermostat is respectively connected to the water outlet end of the EGR cooler and the water outlet end of the cylinder head water jacket, and the water outlet end of the thermostat is respectively connected to the water inlet end of the radiator and the main electronic water pump.

7. The engine cooling system according to claim 6, characterized in that: It also includes a radiator, which is in communication with the water outlet of the thermostat and the water inlet of the main electronic water pump respectively.

8. The engine cooling system according to claim 6, characterized in that: The thermostat comprises a thermostat cavity and a thermostat temperature sensor, wherein the thermostat cavity is used to contain engine oil, and the thermostat temperature sensor is used to detect the temperature of the engine oil in the thermostat cavity.

9. The engine cooling system according to claim 8, characterized in that: An outlet water temperature sensor is provided between the thermostat and the main electronic water pump, and the outlet water temperature sensor is used to detect the temperature of the engine oil flowing from the thermostat to the main electronic water pump.

10. The engine cooling system according to claim 1, characterized in that: It also includes a warm air bypass pipe and a bypass, wherein the bypass is sequentially provided with an auxiliary electronic water pump, a WPTC and a warm air core, the water inlet end of the warm air bypass pipe is communicated with the water outlet end of the thermostat and the water inlet end of the bypass respectively, the bypass is provided with a three-way valve, the three-way valve has a first water outlet end and a second water outlet end, the first water outlet end merges with the water outlet end of the warm air bypass pipe and the water outlet end of the expansion kettle and then flows into the main electronic water pump, the water outlet end two of the three-way valve is communicated with the water inlet end of the warm air bypass pipe, and the water outlet end of the warm air core is communicated with the water inlet end of the valve.

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