Engine cooling system

Abstract

The utility model discloses an engine cooling system which comprises a first electronic water pump, a cylinder body water jacket, a cylinder cover water jacket, an engine oil cooler, an EGR cooler, a supercharger water jacket, a thermolator, a warm air core body and a high-temperature radiator. The outlet end of the cylinder body water jacket is communicated with the inlet end of the cylinder cover water jacket, the inlet end of the engine oil cooler and the inlet end of the supercharger water jacket, the outlet end of the engine oil cooler is communicated with the inlet end of the EGR cooler, and the outlet end of the cylinder cover water jacket, the outlet end of the EGR cooler and the outlet end of the supercharger water jacket are all communicated with the inlet end of the thermolator. The outlet end of the thermolator is communicated with the inlet end of the warm air core and the inlet end of the high-temperature radiator, and the outlet end of the warm air core and the outlet end of the high-temperature radiator are both communicated with the inlet end of the first electronic water pump. According to the engine cooling system, the engine oil cooler and the EGR cooler are arranged in a series connection mode, one path of cooling circulation flow consumption is saved, and the flow performance requirement of a cooling water pump is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle thermal management systems, in particular to an engine cooling system. Background Art

[0002] Existing engine cooling systems generally use the EGR cooler cylinder head water jacket rear water intake method for cooling, and the oil cooler is generally arranged in parallel with the EGR cooler. The cooling water pump needs to simultaneously meet the cylinder head water jacket flow, EGR cooler flow and oil cooler flow. The total flow required is large, the required cooling water pump performance is high, the engine power consumed is large, and the total fuel consumption of the engine increases. Utility Model Content

[0003] The purpose of the utility model is to provide an engine cooling system to solve the problems of large flow rate and large engine consumption in current engine cooling systems.

[0004] The utility model provides an engine cooling system, including a first electronic water pump, a cylinder water jacket, a cylinder head water jacket, an oil cooler, an EGR cooler, a supercharger water jacket, a thermostat, a heater core and a high-temperature radiator, wherein:

[0005] The outlet end of the first electronic water pump is communicated with the inlet end of the cylinder water jacket, the outlet end of the cylinder water jacket is communicated with the inlet end of the cylinder head water jacket, the inlet end of the oil cooler and the inlet end of the supercharger water jacket respectively, the outlet end of the oil cooler is communicated with the inlet end of the EGR cooler, the outlet end of the cylinder head water jacket, the outlet end of the EGR cooler and the outlet end of the supercharger water jacket are all communicated with the inlet end of the thermostat, the outlet end of the thermostat is respectively communicated with the inlet end of the heater core and the inlet end of the high-temperature radiator, the outlet end of the heater core and the outlet end of the high-temperature radiator are both communicated with the inlet end of the first electronic water pump.

[0006] In the engine cooling system as described above, preferably, a bypass pipe is provided on the heater core, the inlet end of the bypass pipe is connected to the outlet end of the thermostat, and the outlet end of the bypass pipe is connected to the first electronic water pump.

[0007] In the engine cooling system as described above, preferably, the inner diameter of the bypass pipe is 8 mm, and the length of the bypass pipe is 30 mm.

[0008] An engine cooling system as described above, wherein, preferably, the engine cooling system also includes a three-way valve, the outlet end of the heater core is connected to the first port of the three-way valve, the second port of the three-way valve is connected to the inlet end of the first electronic water pump, and the third port of the three-way valve is connected to the inlet end of the bypass pipe.

[0009] The engine cooling system as described above, wherein preferably, the engine cooling system further includes an expansion kettle, the outlet end of the EGR cooler is connected to the inlet end of the thermostat via a first pipeline, the outlet end of the pressurized water jacket is connected to the inlet end of the thermostat via a second pipeline, and the second port of the three-way valve is connected to the inlet end of the first electronic water pump via a third pipeline, wherein:

[0010] The connection between the first pipeline and the second pipeline forms a first connection point, the connection between the third pipeline and the outlet end of the bypass pipe forms a second connection point, the inlet end of the expansion kettle is respectively connected to the cylinder head water jacket, the high-temperature radiator and the first connection point, and the outlet end of the expansion kettle is connected to the second connection point.

[0011] In the engine cooling system as described above, preferably, a temperature sensor is provided on the connecting pipe between the thermostat and the heater core.

[0012] As described above, the engine cooling system preferably further includes a heat exchange regulator, and the heat exchange regulator is used to regulate the heat exchange amount between the high-temperature radiator and the outside world.

[0013] In the engine cooling system as described above, preferably, the heat exchange regulator is a radiator fan, and the high-temperature radiator is located on an air outlet path of the radiator fan.

[0014] As described above, the engine cooling system preferably further comprises a second electronic water pump, and the second electronic water pump is provided on the communication pipeline between the thermostat and the heater core.

[0015] In the engine cooling system as described above, preferably, a PTC heater is further provided on the communication pipeline between the second electronic water pump and the heater core.

[0016] Compared with the existing technology, the engine cooling system of the present invention arranges the oil cooler and the EGR cooler in series, saving the flow consumption of one cooling cycle, reducing the flow performance requirements of the cooling water pump, and reducing the shaft power of the cooling water pump, thereby reducing the total fuel consumption of the engine and improving the thermal efficiency of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an engine cooling system provided by an embodiment of the present utility model.

[0018] Explanation of Reference Numerals: 1-first electronic water pump, 2-cylinder water jacket, 3-cylinder head water jacket, 4-oil cooler, 5-EGR cooler, 6-supercharger water jacket, 7-thermostat, 8-heater core, 9-high-temperature radiator, 10-bypass pipe, 11-three-way valve, 12-expansion kettle, 13-temperature sensor, 14-heat exchange regulator, 15-second electronic water pump, 16-PTC heater;

[0019] G1-first pipeline, G2-second pipeline, G3-third pipeline, L1-first connection point, L2-second connection point. DETAILED DESCRIPTION

[0020] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] Reference Figure 1 As shown, the utility model provides an engine cooling system, including a first electronic water pump 1, a cylinder water jacket 2, a cylinder head water jacket 3, an oil cooler 4, an EGR cooler 5, a supercharger water jacket 6, a thermostat 7, a heater core 8 and a high-temperature radiator 9, wherein:

[0022] The outlet end of the first electronic water pump 1 is connected to the inlet end of the cylinder water jacket 2, and the outlet end of the cylinder water jacket 2 is connected to the cylinder head water jacket 3, the inlet end of the oil cooler 4, and the inlet end of the supercharger water jacket 6. Under the action of the first electronic water pump 1, the oil cooler 4 can directly draw water (i.e., coolant) from the low-temperature cylinder water jacket 2, and then use the low-temperature water to cool the engine oil, which can effectively control the engine oil temperature and improve the heat dissipation performance.

[0023] The outlet of the oil cooler 4 is connected to the inlet of the EGR cooler 5. The coolant flowing out of the oil cooler 4 absorbs the heat of the oil and then heats up. The heated coolant enters the EGR cooler 5, which increases the water inlet temperature of the EGR cooler 5, which helps to reduce the risk of coking in the gas path of the EGR cooler 5. When the high-temperature gas exchanges heat with the low-temperature wall, the greater the temperature difference, the greater the coking risk. After the coolant temperature is increased, it can reduce the temperature difference with the wall of the EGR cooler 5, thereby reducing the coking risk. The EGR cooler 5 is connected in series with the oil cooler 4, which reduces the total flow rate when connected in parallel, effectively reduces the pressure of the first electronic water pump 1, reduces the power of the engine and the total fuel consumption, and is beneficial to energy saving.

[0024] The outlet end of the cylinder head water jacket 3, the outlet end of the EGR cooler 5 and the outlet end of the supercharger water jacket 6 are all connected to the inlet end of the thermostat 7, and the outlet end of the thermostat 7 is respectively connected to the inlet end of the heater core 8 and the inlet end of the high-temperature radiator 9, and the outlet end of the heater core 8 and the outlet end of the high-temperature radiator 9 are both connected to the inlet end of the first electronic water pump 1.

[0025] In the embodiment provided in the present application, the coolant flowing through the cylinder head water jacket 3, the EGR cooler 5, and the supercharger water jacket 6 is collected at the thermostat 7. The collected coolant has a certain temperature. The thermostat 7 has a temperature sensor. Under the action of the temperature sensor, if the engine temperature is low, the temperature sensor in the thermostat 7 senses the low temperature of the coolant. There is no need to activate the flow channel between the thermostat 7 and the high-temperature radiator 9. The high-temperature radiator 9 does not participate in cooling, and the coolant flows directly to the heater core 8. When the engine temperature is high, the temperature sensor in the thermostat 7 senses the high temperature of the coolant, and the flow channel between the thermostat 7 and the high-temperature radiator 9 is opened. The coolant flows to the heater core 8 and the high-temperature radiator 9 respectively to cool the engine. After the engine cools down, the coolant flows back to the engine under the action of the pressure provided by the first electronic water pump 1 to achieve the circulation of the coolant.

[0026] Since the coolant flowing through the cylinder head water jacket 3, EGR cooler 5, and supercharger water jacket 6 is collected at the thermostat 7 and then concentrated to flow to the heater core 8, in order to prevent excessive flow or system pressure in the pipeline, in the embodiment provided by this application, a bypass pipe 10 is connected to the heater core 8. The inlet end of the bypass pipe 10 is connected to the inlet end of the thermostat 7, and the outlet end of the bypass pipe 10 is connected to the first electronic water pump 1. Part of the coolant flowing out of the thermostat 7 can flow into the first electronic water pump 1 through the bypass pipe 10, effectively reducing the coolant flow through the heater core 8 and maintaining the stability of the system pressure. Preferably, the inner diameter of the bypass pipe 10 is 8 mm and the length of the bypass pipe 10 is 30 mm.

[0027] In a feasible embodiment, the engine cooling system also includes a three-way valve 11, a first port of the three-way valve 11 is connected to the outlet end of the heater core 8, a second port of the three-way valve 11 is connected to the inlet end of the first electronic water pump 1, and a third port of the three-way valve 11 is connected to the inlet end of the bypass pipe 10. When the coolant flow through the heater core 8 is too large, part of the coolant can flow to the first electronic water pump 1 through the second port of the three-way valve 11, and another part of the coolant can enter the bypass pipe 10 from the third port of the three-way valve 11 and then flow to the first electronic water pump 1, so that the coolant flows to the first electronic water pump 1 in two ways, thereby sharing the system pressure.

[0028] When the temperature of the coolant in the system rises, the volume of the coolant will expand. In order to provide expansion space for the cooling system to adapt to the volume change of the coolant due to temperature change, in the embodiment provided in the present application, the engine cooling system also includes an expansion kettle 12, the outlet end of the EGR cooler 5 is connected to the inlet end of the thermostat 7 through a first pipe G1, the outlet end of the supercharger water jacket 6 is connected to the inlet end of the thermostat 7 through a second pipe G2, and the second port of the three-way valve 11 is connected to the inlet end of the first electronic water pump 1 through a third pipe G3. The connection between the first pipeline G1 and the second pipeline G2 forms a first connection point L1. The coolant flows out from the EGR cooler 5 and the supercharger water jacket 6 respectively. After being collected at the first connection point L1, part of the coolant flows to the thermostat 7, and part of the coolant flows from the first connection point L1 to the expansion pot 12. Part of the coolant that flows through the cylinder head water jacket 3 and the high-temperature radiator 9 also flows to the expansion pot 12. The coolant can be cooled in the expansion pot 12. The volume of the cooled coolant shrinks and can continue to cool the system; the connection between the third pipeline G3 and the outlet end of the bypass pipe 10 forms a second connection point L2. The cooled coolant in the expansion pot 12, the coolant flowing out of the second port of the three-way valve 11, and the coolant flowing out of the bypass pipe 10 can be collected at the second connection point L2 and flow to the first electronic water pump 1, thereby maintaining the normal operation of the cooling system.

[0029] When the coolant flowing out of the thermostat 7 flows to the heater core 8, in order to judge whether the temperature of the coolant can achieve the effect of cooling the heater core 8, a temperature sensor 13 is set on the connecting pipe between the thermostat 7 and the heater core 8. When the coolant flows out of the thermostat 7, the real-time monitoring of the temperature sensor 13 can be used to understand whether the temperature of the coolant is normal or too high, and then the cooling system is adjusted accordingly according to the actual situation to achieve a good cooling effect.

[0030] When the temperature of the engine is too high, the high-temperature radiator 9 needs to be started for cooling. In order to improve the cooling effect of the high-temperature radiator 9, in the embodiment provided in this application, the engine cooling system also includes a heat exchange regulator 14. The heat exchange regulator 14 is used to adjust the heat exchange rate between the high-temperature radiator 9 and the outside world, thereby adjusting the heat dissipation effect of the high-temperature radiator 9 according to the actual situation of the engine.

[0031] In a feasible embodiment, the heat exchange regulator 14 is a radiator fan, and the high-temperature radiator 9 is located on the air outlet path of the radiator fan. During actual cooling, the heat exchange rate between the high-temperature radiator 9 and the outside world can be adjusted by adjusting the speed of the radiator fan. When the engine temperature is high, the speed of the radiator fan is adjusted to a larger value to improve the heat dissipation efficiency of the high-temperature radiator 9. When the engine temperature is relatively low, the speed of the radiator fan can be reduced, and then the heat exchange rate between the high-temperature radiator 9 and the outside world can be flexibly controlled according to the engine temperature, thereby achieving energy saving while dissipating heat efficiently.

[0032] Since the flow rate of coolant flowing from the thermostat 7 into the heater core 8 is relatively large, in order to provide power for the coolant so that the coolant with a relatively large flow rate can flow smoothly to the heater core 8, in the embodiment provided in the present application, a second electronic water pump 15 is provided on the connecting pipeline between the thermostat 7 and the heater core 8. The coolant flowing out of the thermostat 7 can flow smoothly to the heater core 8 under the pressure provided by the second electronic water pump 15.

[0033] When the temperature of the coolant flowing to the heater core 8 is low, the coolant needs to be properly heated to meet the temperature required by the heater core 8. Therefore, a PTC heater 16 is provided on the connecting pipe between the second electronic water pump 15 and the heater core 8 to properly heat the coolant flowing through so that the temperature of the coolant flowing into the heater core 8 is appropriate.

[0034] The engine cooling system of the present application is applicable to the small-circulation working condition and the large-circulation working condition of the automobile. The small-circulation working condition and the large-circulation working condition generally refer to two different working states of the automobile cooling system, which are related to the circulation mode of the engine coolant.

[0035] Under the small-circulation operating condition, the engine coolant mainly circulates inside the engine without undergoing large-scale heat exchange through the high-temperature radiator 9. This operating condition usually occurs at the initial stage of engine startup, when the engine temperature is low and does not require excessive cooling. The small-circulation operating condition helps the engine quickly heat up to the operating temperature and reduce engine wear.

[0036] When the car is in a small circulation condition, the coolant circulation routes include the following:

[0037] 1. First electronic water pump 1 - cylinder water jacket 2 - cylinder head water jacket 3 - thermostat 7 - temperature sensor 13 - heater core 8 - inlet of first electronic water pump 1.

[0038] 2. First electronic water pump 1 - cylinder water jacket 2 - cylinder head water jacket 3 - thermostat 7 - temperature sensor 13 - bypass pipe 10 (heater core 8) - inlet of first electronic water pump 1.

[0039] 3. First electronic water pump 1 - cylinder water jacket 2 - oil cooler 4 - EGR cooler 5 - thermostat 7 - temperature sensor 13 - heater core 8 - inlet of first electronic water pump 1

[0040] 4. First electronic water pump 1 - cylinder water jacket 2 - supercharger water jacket 6 - thermostat 7 - temperature sensor 13 - heater core 8 - inlet of first electronic water pump 1.

[0041] When the engine temperature rises to a certain level, the cooling system switches to a large-circulation mode. In this mode, the coolant not only circulates within the engine but also flows through the high-temperature radiator 9, where it exchanges heat with the outside air, effectively dissipating the heat generated by the engine. This mode helps maintain a stable temperature at high engine operating temperatures and prevent overheating.

[0042] When the car is in a large circulation condition, the coolant circulation routes include the following:

[0043] 1. First electronic water pump 1 - cylinder water jacket 2 - cylinder head water jacket 3 - thermostat 7 - temperature sensor 13 - heater core 8 - inlet of first electronic water pump 1.

[0044] 2. First electronic water pump 1 - cylinder water jacket 2 - cylinder head water jacket 3 - thermostat 7 - high-temperature radiator 9 - inlet of first electronic water pump 1.

[0045] 3. First electronic water pump 1 - cylinder water jacket 2 - oil cooler 4 - EGR cooler 5 - thermostat 7 - temperature sensor 13 - heater core 8 - inlet of first electronic water pump 1

[0046] 4. First electronic water pump 1 - cylinder water jacket 2 - supercharger water jacket 6 - thermostat 7 - temperature sensor 13 - heater core 8 - inlet of first electronic water pump 1.

[0047] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. An engine cooling system, characterized in that: It includes the first electronic water pump, cylinder water jacket, cylinder head water jacket, oil cooler, EGR cooler, supercharger water jacket, thermostat, heater core and high-temperature radiator, among which: The outlet end of the first electronic water pump is communicated with the inlet end of the cylinder water jacket, the outlet end of the cylinder water jacket is communicated with the inlet end of the cylinder head water jacket, the inlet end of the oil cooler and the inlet end of the supercharger water jacket respectively, the outlet end of the oil cooler is communicated with the inlet end of the EGR cooler, the outlet end of the cylinder head water jacket, the outlet end of the EGR cooler and the outlet end of the supercharger water jacket are all communicated with the inlet end of the thermostat, the outlet end of the thermostat is respectively communicated with the inlet end of the heater core and the inlet end of the high-temperature radiator, the outlet end of the heater core and the outlet end of the high-temperature radiator are both communicated with the inlet end of the first electronic water pump.

2. The engine cooling system according to claim 1, characterized in that A bypass pipe is provided on the heater core, the inlet end of the bypass pipe is communicated with the outlet end of the thermostat, and the outlet end of the bypass pipe is communicated with the first electronic water pump.

3. The engine cooling system according to claim 2, characterized in that: The inner diameter of the bypass pipe is 8 mm, and the length of the bypass pipe is 30 mm.

4. The engine cooling system according to claim 2, characterized in that: The engine cooling system also includes a three-way valve, the outlet end of the heater core is connected to the first port of the three-way valve, the second port of the three-way valve is connected to the inlet end of the first electronic water pump, and the third port of the three-way valve is connected to the inlet end of the bypass pipe.

5. The engine cooling system according to claim 4, characterized in that: The engine cooling system further includes an expansion kettle, the outlet end of the EGR cooler is connected to the inlet end of the thermostat via a first pipeline, the outlet end of the supercharger water jacket is connected to the inlet end of the thermostat via a second pipeline, and the second port of the three-way valve is connected to the inlet end of the first electronic water pump via a third pipeline, wherein: The connection between the first pipeline and the second pipeline forms a first connection point, the connection between the third pipeline and the outlet end of the bypass pipe forms a second connection point, the inlet end of the expansion kettle is respectively connected to the cylinder head water jacket, the high-temperature radiator and the first connection point, and the outlet end of the expansion kettle is connected to the second connection point.

6. The engine cooling system according to claim 1, characterized in that A temperature sensor is provided on the communication pipe between the thermostat and the heater core.

7. The engine cooling system according to claim 1, characterized in that The engine cooling system further includes a heat exchange regulator, which is used to regulate the amount of heat exchange between the high-temperature radiator and the outside world.

8. The engine cooling system according to claim 7, characterized in that: The heat exchange regulator is a radiator fan, and the high-temperature radiator is located on an air outlet path of the radiator fan.

9. The engine cooling system according to claim 1, characterized in that The engine cooling system further includes a second electronic water pump, which is arranged on a communication pipeline between the thermostat and the heater core.

10. The engine cooling system according to claim 9, characterized in that: A PTC heater is also provided on the communication pipe between the second electronic water pump and the heater core.

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