Engine cooling system and vehicle

Abstract

The utility model provides an engine cooling system and a vehicle, and the engine cooling system comprises a driving pump connected to one end of an engine; the thermostat is connected to the other end of the engine; one end of the radiator is connected with the thermostat, and the other end of the radiator is connected with the driving pump; one end of the supercharger is connected with the engine, and the other end of the supercharger is connected with the driving pump; the exhaust gas recirculation system is connected with the supercharger in parallel; one end of the warm air system is connected with a pipeline between the engine and the thermostat, and the other end of the warm air system is connected with the driving pump; and one end of the engine oil cooler is connected with a pipeline between the engine and the driving pump, and the other end of the engine oil cooler is connected with a pipeline between the engine and the thermostat. The engine cooling system and the vehicle are simple and convenient, the flow requirement of the radiator can be effectively ensured, energy is saved, cost is reduced, and user experience is good.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and in particular to an engine cooling system and a vehicle. Background Art

[0002] With the development of the vehicle industry, vehicles are increasingly involved in our daily life and work. The engine is an important component of a vehicle, and the cooling system of the engine directly affects the power performance, economy, and reliability of the engine. The existing engine cooling system usually connects three coolant branches of a heating system, an oil cooler, and a supercharger. With the development of technology, a coolant branch of an exhaust gas recirculation system has been newly added, resulting in insufficient flow rate of the radiator and poor heat dissipation effect. Therefore, there is an urgent need for an engine cooling system that can meet the flow rate requirements. Summary of the Utility Model

[0003] In view of this, the purpose of the present application is to propose an engine cooling system and a vehicle to solve the technical problem of insufficient flow rate of the engine cooling system using an exhaust gas recirculation system.

[0004] In the first aspect of the present application, an engine cooling system is provided, including: a driving pump connected to one end of the engine; a thermostat connected to the other end of the engine; a radiator, one end of which is connected to the thermostat and the other end is connected to the driving pump; a supercharger, one end of which is connected to the engine and the other end is connected to the driving pump; an exhaust gas recirculation system connected in parallel with the supercharger; a heating system, one end of which is connected to the pipeline between the engine and the thermostat, and the other end is connected to the driving pump; an oil cooler, one end of which is connected to the pipeline between the engine and the driving pump, and the other end is connected to the pipeline between the engine and the thermostat.

[0005] Further, the heating system includes: a heater core; a four-way valve including a first interface, a second interface, a third interface, and a fourth interface; the first interface is connected to the heater core, and an electronic pump and a heater are connected between the heater core and the four-way valve; the third interface is connected to the pipeline between the engine and the thermostat; the fourth interface is connected to the driving pump; a heating circuit, one end of which is connected to the heater core and the other end is connected to the second interface.

[0006] Further, the heating circuit includes: a first three-way joint connected to the second interface; a three-way proportional valve including a fifth interface, a sixth interface, and a seventh interface, the fifth interface is connected to the heater core, and the seventh interface is connected to the first three-way joint; a heat exchanger, one end of which is connected to the sixth interface and the other end is connected to the first three-way joint.

[0007] Further, the engine cooling system further includes: an expansion water tank, one end of which is connected to the radiator and the other end is connected to the drive pump; the pipeline between the heater and the electronic pump is connected to the expansion water tank through a second three-way joint; the pipeline between the expansion water tank and the radiator is connected to the engine through a third three-way joint.

[0008] Further, a check valve is connected between the radiator and the third three-way joint; a first one-way flow-limiting valve is connected between the second three-way joint and the expansion water tank, and a second one-way flow-limiting valve is connected between the engine and the third three-way joint; a temperature sensor is connected between the radiator and the thermostat.

[0009] In a second aspect of the present application, a vehicle is provided, including the engine cooling system described in the first aspect above.

[0010] As can be seen from the above, the present application provides an engine cooling system and a vehicle. The engine cooling system includes: a drive pump connected to one end of the engine; a thermostat connected to the other end of the engine; a radiator, one end of which is connected to the thermostat and the other end is connected to the drive pump; a supercharger, one end of which is connected to the engine and the other end is connected to the drive pump; an exhaust gas recirculation system connected in parallel with the supercharger; a heating system, one end of which is connected to the pipeline between the engine and the thermostat and the other end is connected to the drive pump; an oil cooler, one end of which is connected to the pipeline between the engine and the drive pump and the other end is connected to the pipeline between the engine and the thermostat. This system changes the traditional circuit layout mode of the oil cooler, connects the circuit in front of the thermostat, and on the basis of not adding a stop valve and increasing the pump flow rate, only by changing the circuit direction of the oil cooler, it can ensure sufficient radiator flow, high resource utilization rate and low cost. The engine cooling system and the vehicle are simple and convenient, can effectively ensure the radiator flow demand, save energy and reduce costs, and have a good user experience. Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions in the present application or related technologies, the following will briefly introduce the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 It is a schematic diagram of the module connection of an engine cooling system in related technologies;

[0013] Figure 2 It is a schematic diagram of the module connection of an engine cooling system in an embodiment of the present application;

[0014] Figure 3Schematic diagram of module connection of another engine cooling system in the embodiment of the present application;

[0015] Figure 4 is Figure 3 Schematic diagram of the physical structure of the engine cooling system in

[0016] Figure 5 Conduction schematic diagram of a four-way valve in the embodiment of the present application;

[0017] Figure 6 Conduction schematic diagram of another four-way valve in the embodiment of the present application.

[0018] Reference numerals: 1, engine; 2, drive pump; 3, thermostat; 4, radiator; 4-1, temperature sensor; 5, exhaust gas recirculation system; 6, heating system; 6-1, heating core; 6-2, four-way valve; 6-3, heating circuit; 6-4, first three-way joint; 6-5, three-way proportional valve; 6-6, heat exchanger; 6-7, electronic pump; 6-8, heater; 7, oil cooler; 8, expansion water tank; 8-1, second three-way joint; 8-2, third three-way joint; 8-3, check valve; 8-4, first one-way flow-limiting valve; 8-5, second one-way flow-limiting valve; 9, supercharger. Detailed implementation manners

[0019] To make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0020] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those of ordinary skill in the art to which the present application belongs. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0021] With the development of the vehicle industry, more and more vehicles are involved in our daily life and work. The engine is an important component of a vehicle, and the cooling system of the engine directly affects the power performance, economy and reliability of the engine. The existing engine cooling systems usually connect three coolant branches of a heating system, an oil cooler and a supercharger. With the development of technology, a coolant branch of an exhaust gas recirculation system has been newly added, resulting in insufficient flow rate of the radiator and poor heat dissipation effect. Therefore, there is an urgent need for an engine cooling system that can meet the flow rate requirements.

[0022] Approximately one-third of the heat generated by engine combustion is converted into useful mechanical energy, another one-third is discharged in the form of exhaust gas, and the remaining heat is carried away by the cooling system. The engine cooling system plays a crucial role in the performance of the air-conditioning heating system, the engine intake air intercooling system, and the automatic transmission oil cooling system. Therefore, the design and research of the engine cooling system have become increasingly in-depth. On the premise of ensuring sufficient heat dissipation capacity and strength, high efficiency and low energy consumption have become the development trend of the cooling system.

[0023] The function of the engine cooling system is to promptly dissipate the heat generated during the engine's operation to the outside world, ensuring that the engine can operate normally and reliably at the most suitable temperature under any load conditions and working environments. Its function can be simply described as preventing the engine from overheating and overcooling. During the engine's operation, fuel combustion occurs in a closed cylinder. The chemical energy during fuel combustion is converted into heat energy, causing the gas to expand and generate pressure to drive the piston movement. The piston is connected to the crankshaft through the connecting rod to do work. Since heat is generated during fuel combustion in the cylinder, the temperatures of metal parts such as the piston, cylinder liner, and cylinder head in contact with the combustion gas increase. If these components cannot be cooled in time, serious consequences will occur.

[0024] As Figure 1 shown, the existing cooling system of engine 1 is usually connected to three coolant branches: the heating system 6, the oil cooler 7, and the supercharger 9. With the development of technology, a coolant branch for the exhaust gas recirculation system 5 (EGR, Exhaust Gas Re-circulation) has been newly added to improve the overall engine fuel consumption. The exhaust gas recirculation system 5 refers to returning a part of the exhaust gas discharged from the engine 1 to the intake manifold and entering the cylinder again together with the fresh air-fuel mixture. The main purpose is to reduce the nitrogen oxides (NOx) in the discharged gas, share part of the load, and improve the fuel consumption rate. When the EGR technology is used in gasoline engines, it will cause the temperature of the end mixture to rise, increasing the possibility of knocking. Therefore, the EGR system needs to add a coolant branch to cool the exhaust gas before it enters the cylinder to avoid knocking. However, without changing the overall thermal management architecture, adding an additional coolant branch will result in insufficient flow supply of the vehicle radiator 4 and reduce the heat dissipation effect.

[0025] To address this problem, if only the driving pump power is simply increased to increase the total flow rate, it will greatly increase the energy consumption and the cost is relatively high; if a cut-off valve is set in some existing branches to prevent multiple branches from opening simultaneously, although the flow rate of the radiator 4 can be ensured, adding the cut-off valve will occupy more space and be limited in vehicle interior layout.

[0026] During the implementation of this application, it was found that it is possible to consider changing the existing coolant branches to meet the flow rate requirements of the radiator 4, such as Figure 1As shown in the figure, the original circuit of the engine oil cooler 7 is connected in front of the drive pump 2, that is, the inlet circuit of the engine oil cooler 7 is connected between the drive pump 2 and the engine 1, and the circuit is connected to the inlet of the drive pump 2. Then, after the coolant flows through the drive pump 2, a part of the coolant enters the engine oil cooler 7, and the remaining coolant will enter the engine 1. Among the coolant passing through the engine 7, the first part will flow to the supercharger 9 and the exhaust gas recirculation system 5, and the second part will flow to the heating system 6. Therefore, only a relatively small third part will flow to the radiator 4.

[0027] At the same power, the coolant flow rate through the drive pump 2 is fixed. The circuit design can be adjusted to connect the circuit of the engine oil cooler 7 between the engine 1 and the thermostat 3. In this way, after the coolant flows through the drive pump 2, although a part of the coolant still enters the engine oil cooler 7, the coolant passing through the engine oil cooler 7 can directly flow to the outlet of the engine 7 to quickly replenish the coolant to the heating system 6 and the radiator 4, thereby ensuring the flow requirement of the radiator 4.

[0028] The following will, through specific embodiments and in combination with Figures 2 to 6 be used to elaborate in detail the technical solutions of this application.

[0029] In some embodiments of this application, an engine cooling system is provided, which is applied to the engine 1. As Figure 2 shown, it includes: a drive pump 2 connected to one end of the engine 1; a thermostat 3 connected to the other end of the engine 1; a radiator 4, one end of which is connected to the thermostat 3 and the other end is connected to the drive pump 2; a supercharger 9, one end of which is connected to the engine 1 and the other end is connected to the drive pump 2; an exhaust gas recirculation system 5 in parallel with the supercharger 9; a heating system 6, one end of which is connected to the pipeline between the engine 1 and the thermostat 3 and the other end is connected to the drive pump 2; an engine oil cooler 7, one end of which is connected to the pipeline between the engine 1 and the drive pump 2 and the other end is connected to the pipeline between the engine 1 and the thermostat 3.

[0030] As Figure 2 shown, a drive pump 2 is connected to one end of the engine 1 to drive the coolant to flow. The coolant is usually water. A thermostat 3 is connected to the other end of the engine 1. The thermostat 3 can automatically adjust the amount of coolant entering the radiator 4 according to the coolant temperature, change the circulation range of the coolant, so as to adjust the heat dissipation capacity of the cooling system and ensure that the engine 1 works within a suitable temperature range.

[0031] One end of the radiator 4 is connected to the thermostat 3 and the other end is connected to the drive pump 2. The radiator 4 (HT RAD) cools the engine 1 by forcing the coolant to circulate, and is a heat exchange device that ensures the engine 1 works continuously within the normal temperature range.

[0032] One end of the supercharger 9 is connected to the engine 1, and the other end is connected to the drive pump 2. It can transport exhaust gas to the supercharger 9 for boosting. The boosted exhaust gas is transported to the engine 1 to participate in combustion, which can reduce nitrogen oxides in the exhaust gas and protect the environment.

[0033] The exhaust gas recirculation system 5 is connected in parallel with the supercharger 9. Cooperating with the supercharger 9, it can separate a part of the exhaust gas after fuel combustion and introduce it into the intake side to burn again.

[0034] One end of the heater system 6 is connected to the pipeline between the engine 1 and the thermostat 3, and the other end is connected to the drive pump 2. It can use the heat of the engine 1 for heating.

[0035] One end of the oil cooler 7 (OC) is connected to the pipeline between the engine 1 and the drive pump 2, and the other end is connected to the pipeline between the engine 1 and the thermostat 3. The oil cooler 7 is a device that accelerates the heat dissipation of the lubricating oil to keep it at a lower temperature.

[0036] As Figure 1 shown, the original circuit of the oil cooler 7 is connected in front of the drive pump 2, that is, the inlet path of the oil cooler 7 is connected between the drive pump 2 and the engine 1, and the return path is connected to the inlet of the drive pump 2. Then, after the coolant flows through the drive pump 2, a part of the coolant enters the oil cooler 7, and the remaining coolant will enter the engine 1. And among the coolant passing through the engine 7, the first part will flow to the supercharger 9 and the exhaust gas recirculation system 5, and the second part will flow to the heater system 6. So only a small third part will flow to the radiator 4.

[0037] At the same power, the coolant flow rate through the drive pump 2 is fixed. As Figure 2 shown, in this embodiment, the circuit of the oil cooler 7 is connected between the engine 1 and the thermostat 3. In this way, after the coolant flows through the drive pump 2, although a part of the coolant enters the oil cooler 7, the coolant passing through the oil cooler 7 can directly flow to the outlet of the engine 7 to quickly supplement the coolant to the heater system 6 and the radiator 4, thus ensuring the flow demand of the radiator 4; neither increasing the power of the drive pump 2 to increase the total flow rate, greatly reducing energy consumption and cost; nor setting a cut-off valve on the existing branch, avoiding limited layout in the vehicle.

[0038] This system changes the traditional circuit layout method of the oil cooler 7, connects the circuit in front of the thermostat 3. Without adding a cut-off valve and increasing the pump flow rate, only by changing the circuit direction of the oil cooler 7, it can ensure sufficient flow of the radiator 4, with high resource utilization rate and low cost.

[0039] The engine cooling system is simple and convenient, which can effectively ensure the flow demand of the radiator 4, save energy and reduce costs, and provide a good user experience.

[0040] In some embodiments, such as Figure 3 and Figure 4 shown, the warm air system 6 includes: a warm air core 6-1; a four-way valve 6-2, including a first interface, a second interface, a third interface and a fourth interface; the first interface is connected to the warm air core 6-1, and an electronic pump 6-7 and a heater 6-8 are connected between the warm air core 6-1 and the four-way valve 6-2; the third interface is connected to the pipeline between the engine 1 and the thermostat 3; the fourth interface is connected to the drive pump 2; a warm air circuit 6-3, one end of which is connected to the warm air core 6-1 and the other end of which is connected to the second interface.

[0041] As Figure 3 shown, the warm air system 6 includes a warm air core 6-1, a four-way valve 6-2 and a warm air circuit 6-3. The warm air core 6-1 is used to provide the warm air function. An electronic pump 6-7 and a heater 6-8 (PTC) are connected between the warm air core 6-1 and the four-way valve 6-2. The electronic pump 6-7 is used to drive the coolant circulation. The heater 6-8 can consume electrical energy to generate heat to help increase the temperature inside the vehicle. The warm air circuit 6-3 is used to form a coolant circuit, and a heat exchanger 6-6 can be set to cool the coolant.

[0042] The four-way valve 6-2 is used to control the circulation mode of the coolant in the warm air system 6. As Figure 3 shown, a is the first interface of the four-way valve 6-2, b is the second interface of the four-way valve 6-2, c is the third interface of the four-way valve 6-2, and d is the fourth interface of the four-way valve 6-2.

[0043] As Figure 5 shown, when the first interface and the second interface are connected and the third interface and the fourth interface are connected, the coolant of the warm air system 6 circulates by itself and does not participate in the coolant circulation of the engine 1; as Figure 6 shown, when the first interface and the third interface are connected and the second interface and the fourth interface are connected, the coolant of the warm air system 6 and the engine 1 can achieve an overall linked circulation, that is, the waste heat of the engine 1 can be used to heat the warm air system 6.

[0044] In some embodiments, such as Figure 3 and Figure 4 shown, the warm air circuit 6-3 includes: a first three-way joint 6-4, which is connected to the second interface; a three-way proportional valve 6-5, including a fifth interface, a sixth interface and a seventh interface, the fifth interface is connected to the warm air core 6-1, the seventh interface is connected to the first three-way joint 6-4; a heat exchanger 6-6, one end of which is connected to the sixth interface and the other end of which is connected to the first three-way joint 6-4.

[0045] As shown Figure 3 in the figure, the warm air circuit 6-3 includes a first three-way valve 6-4, a three-way proportional valve 6-5, and a heat exchanger 6-6. The heat exchanger 6-6 is used to exchange heat with the coolant; as shown Figure 3 in the figure, e is the fifth interface of the three-way proportional valve 6-5, f is the sixth interface of the three-way proportional valve 6-5, and g is the seventh interface of the three-way proportional valve 6-5. The three-way proportional valve 6-5 can adjust the coolant flow rate entering the heat exchanger 6-6. For example, when the coolant entering the heat exchanger 6-6 is adjusted to be less, most of the coolant can flow back to the four-way valve 6-2 through the first three-way valve 6-4.

[0046] In some embodiments, as shown Figure 3 and Figure 4 in the figure, the engine cooling system further includes: an expansion water tank 8, one end of which is connected to the radiator 4 and the other end is connected to the driving pump 2.

[0047] The expansion water tank 8 is used to supplement the coolant and balance the air pressure of the cooling system; the expansion water tank 8 is connected to the radiator 4 to balance the air pressure of the radiator 4.

[0048] In some embodiments, as shown Figure 3 in the figure, the pipeline between the heater 6-8 and the electronic pump 6-7 is connected to the expansion water tank 8 through a second three-way valve 8-1, which can balance the air pressure of the warm air system 6.

[0049] In some embodiments, as shown Figure 3 in the figure, the pipeline between the expansion water tank 8 and the radiator 4 is connected to the engine 1 through a third three-way valve 8-2, which can balance the air pressure of the engine 1.

[0050] In some embodiments, as shown Figure 3 in the figure, a one-way valve 8-3 is connected between the radiator 4 and the third three-way valve 8-2, a first one-way flow-limiting valve 8-4 is connected between the second three-way valve 8-1 and the expansion water tank 8, and a second one-way flow-limiting valve 8-5 is connected between the engine 1 and the third three-way valve 8-2. By setting the one-way valve 8-3 and the one-way flow-limiting valve, it is used to guide the gas flow to the expansion water tank 8 to avoid reverse flow overpressure.

[0051] In some embodiments, as shown Figure 3 in the figure, a temperature sensor 4-1 is connected between the radiator 4 and the thermostat 3, which is used to monitor the coolant temperature flowing to the radiator 4 for convenient temperature control.

[0052] In some embodiments of the present application, a vehicle is provided, including the engine cooling system described in any of the above embodiments.

[0053] This vehicle has low energy consumption and good user experience.

[0054] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present application as described above, and they are not provided in detail for the sake of brevity.

[0055] In addition, for simplicity of explanation and discussion, and in order not to make the embodiments of the present application difficult to understand, the device may be shown in the form of a block diagram, so as to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation manner of these block diagram devices are highly dependent on the platform on which the embodiments of the present application will be implemented (that is, these details should be completely within the understanding scope of those skilled in the art). In the case where specific details are set forth to describe the exemplary embodiments of the present application, it will be apparent to those skilled in the art that the embodiments of the present application can be implemented without these specific details or with variations of these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0056] Although the present application has been described in connection with specific embodiments of the present application, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description.

[0057] The embodiments of the present application are intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included within the protection scope of the present application.

Claims

1. An engine cooling system, characterized in that: include: A drive pump connected to one end of the engine; a thermostat connected to the other end of the engine; A radiator, one end of which is connected to the thermostat, and the other end of which is connected to the driving pump; A supercharger, one end of which is connected to the engine and the other end of which is connected to the driving pump; an exhaust gas recirculation system connected in parallel with the supercharger; A warm air system, one end of which is connected to the pipeline between the engine and the thermostat, and the other end of which is connected to the driving pump; An oil cooler has one end connected to a pipeline between the engine and the driving pump, and the other end connected to a pipeline between the engine and the thermostat.

2. The engine cooling system according to claim 1, characterized in that: The heating system comprises: Heater core; The four-way valve comprises a first interface, a second interface, a third interface and a fourth interface; the first interface is connected to the heater core, an electronic pump and a heater are connected between the heater core and the four-way valve; the third interface is connected to the pipeline between the engine and the thermostat; the fourth interface is connected to the drive pump; A warm air loop has one end connected to the warm air core and the other end connected to the second interface.

3. The engine cooling system according to claim 2, characterized in that: The warm air circuit comprises: A first three-way connection connected to the second interface; A three-way proportional valve, comprising a fifth interface, a sixth interface and a seventh interface, wherein the fifth interface is connected to the heater core, and the seventh interface is connected to the first three-way valve; A heat exchanger, one end of which is connected to the sixth interface, and the other end of which is connected to the first tee.

4. The engine cooling system according to claim 3, characterized in that: Also includes: An expansion kettle has one end connected to the radiator and the other end connected to the driving pump.

5. The engine cooling system according to claim 4, characterized in that: The pipeline between the heater and the electronic pump is connected to the expansion kettle through a second three-way connection.

6. The engine cooling system according to claim 5, characterized in that: The pipeline between the expansion kettle and the radiator is connected to the engine through a third tee.

7. The engine cooling system according to claim 6, characterized in that: A one-way valve is connected between the radiator and the third three-way connection.

8. The engine cooling system according to claim 6, characterized in that: A first one-way flow limiting valve is connected between the second three-way connection and the expansion kettle, and a second one-way flow limiting valve is connected between the engine and the third three-way connection.

9. The engine cooling system according to claim 1, characterized in that: A temperature sensor is connected between the radiator and the thermostat.

10. A vehicle, characterized in that: An engine cooling system comprising any one of claims 1-9.

Images