Engine cooling system

Abstract

The application discloses an engine cooling system, which comprises an electronic water pump, a water cooling jacket assembly, a pipeline assembly, a temperature regulator and a radiator, wherein the electronic water pump, the water cooling jacket assembly, the temperature regulator and the radiator are connected through the pipeline assembly to form a closed circulation loop so that the cooling medium forms a circulation and realizes engine heat dissipation; the engine cooling system disclosed by the application is improved and optimized in structure and circulation mode of the cooling medium, so that only the cooling medium of the cylinder head participates in the circulation during the warming-up process, the temperature rises rapidly, emission and winter heating are facilitated, and the function of rapid warming-up after cold start is realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engine, and relates to an engine cooling system. BACKGROUND

[0002] During the operation of the engine, the heat dissipation of the cylinder head water jacket is 2 to 3 times that of the cylinder body water jacket. During the warm-up process, the existing engine cooling system is in a small circulation condition, that is, the cooling liquid in the cylinder body water jacket and the cylinder head water jacket is mixed after heat exchange and then circulated through the outlet of the water pump. Since the temperature rise of the cooling liquid in the cylinder head water jacket is greater than that of the cooling liquid in the cylinder body water jacket, the mixing of the cooling liquid in the cylinder body water jacket and the cylinder head water jacket slows down the temperature rise speed of the small circulation cooling liquid, which is not conducive to shortening the heating time in winter and cannot realize rapid warm-up. At the same time, the participation of the cooling liquid in the cylinder body water jacket reduces the temperature rise speed of the cylinder head water jacket, increases the heating time in winter, and affects the heating effect. Since the emission pollution decreases with the increase of temperature, it is not conducive to emission.

[0003] In order to solve the above problems, it is necessary to optimize and improve the existing engine cooling system to achieve the purposes of rapid warm-up and emission reduction. SUMMARY

[0004] Therefore, the present application provides an engine cooling system, which is improved and optimized in structure and circulation mode of the cooling medium, so that only the cooling medium of the cylinder head participates in the circulation during the warm-up process, the temperature rises rapidly, which is conducive to emission and winter heating, and the function of rapid warm-up after cold start is realized.

[0005] The engine cooling system disclosed by the present application comprises an electronic water pump, a water jacket assembly, a pipeline assembly, a temperature regulator and a radiator, the water jacket assembly is composed of a cylinder head water jacket and a cylinder body water jacket which are in communication with each other, the pipeline assembly comprises a water pump outlet pipe, a first return pipe, a cylinder body outlet pipe, a radiator outlet pipe and a cylinder head outlet pipe I, the temperature regulator is provided with a main valve, a sub valve and a water outlet, the water pump outlet pipe is connected to the outlet of the electronic water pump and the inlet of the cylinder head water jacket, the cylinder body outlet pipe is connected to the outlet of the cylinder body water jacket and the inlet of the radiator, one end of the radiator outlet pipe is connected to the outlet of the radiator, and the other end is connected to the main valve of the temperature regulator, the cylinder head outlet pipe I is connected to the cylinder head water jacket and the sub valve of the temperature regulator, one end of the first return pipe is connected to the water outlet of the temperature regulator, and the other end is connected to the inlet of the electronic water pump, and the electronic water pump, the water jacket assembly, the temperature regulator and the radiator are connected through the pipeline assembly to form a closed circulation loop so that the cooling medium forms a circulation and realizes the heat dissipation of the engine.

[0006] Further, the engine cooling system further comprises a heater core and an EGR cooler, the pipeline assembly further comprises a second return water pipe, the cylinder head water jacket is further provided with a cylinder head water outlet pipe II and a cylinder head water outlet pipe III, the cylinder head water jacket is communicated with the inlet of the heater core through the cylinder head water outlet pipe II, the cylinder head water jacket is communicated with the inlet of the EGR cooler through the cylinder head water outlet pipe III, the outlet of the heater core and the outlet of the EGR cooler are connected to the inlet of the second return water pipe, and the outlet of the second return water pipe is connected to the inlet of the electronic water pump.

[0007] Further, the engine cooling system further comprises an oil cooler and a turbocharger, the pipeline assembly further comprises a third return water pipe, the inlet of the oil cooler and the inlet of the turbocharger are communicated with the water pump outlet pipe, the outlet of the oil cooler and the outlet of the turbocharger are connected to the inlet of the third return water pipe, and the outlet of the third return water pipe is connected to the inlet of the electronic water pump.

[0008] Further, the engine cooling system further comprises an expansion tank, the pipeline assembly further comprises a deaeration pipe I and a deaeration pipe II, the expansion tank is provided with a water inlet I, a water inlet II and a water outlet, the cylinder head water jacket is communicated with the water inlet I of the expansion tank through the deaeration pipe I, the outlet of the EGR cooler is communicated with the water inlet II of the expansion tank through the deaeration pipe II, and the outlet of the expansion tank is communicated with the second return water pipe.

[0009] Further, the engine cooling system comprises at least a circulation mode I, a circulation mode II and a circulation mode III; when the outlet water temperature of the cooling medium is less than 82℃, the circulation mode I of the engine cooling system is started; when the outlet water temperature of the cooling medium is not less than 82℃ and not higher than 95℃, the circulation mode II of the engine cooling system is started; and when the outlet water temperature of the cooling medium is higher than 95℃, the circulation mode III of the engine cooling system is started.

[0010] Further, in the circulation mode I, the main valve of the thermostat is closed, the auxiliary valve is fully opened, the electronic water pump is operated and the cooling medium is pumped to the cylinder head water jacket, the turbocharger and the oil cooler, the cooling medium entering the cylinder head water jacket partially enters the heater core and partially enters the EGR cooler, and the remaining cooling medium of the cylinder head water jacket enters the inlet of the electronic water pump after flowing through the thermostat; the cooling medium entering the turbocharger and the oil cooler flows out after cooling the turbocharger and the oil cooler respectively, and then converges and flows back to the electronic water pump through the third return water pipe; the cooling medium entering the heater core and the EGR cooler flows out after cooling the heater core and the EGR cooler respectively, and then converges and flows back to the electronic water pump through the second return water pipe.

[0011] Further, under the circulation mode II, the main valve and the auxiliary valve of the thermostat are partially opened, the electronic water pump is operated and the cooling medium is pumped to the cylinder head water jacket, the turbocharger and the oil cooler; the cooling medium entering the cylinder head water jacket partially enters the heater core, partially enters the EGR cooler, and the cooling medium entering the cylinder head water jacket through the auxiliary valve of the thermostat flows back to the inlet of the electronic water pump after flowing through the thermostat; the remaining cooling medium entering the cylinder head water jacket sequentially passes through the cylinder block water jacket and the radiator, and then flows back to the inlet of the electronic water pump through the main valve of the thermostat after flowing through the thermostat; the cooling medium entering the turbocharger and the oil cooler flows out after cooling the turbocharger and the oil cooler respectively, and then flows back to the electronic water pump through the third water return pipe; the cooling medium entering the heater core and the EGR cooler flows out after cooling the heater core and the EGR cooler respectively, and then flows back to the electronic water pump through the second water return pipe.

[0012] Further, under the circulation mode III, the main valve of the thermostat is fully opened and the auxiliary valve is closed, the electronic water pump is operated and the cooling medium is pumped to the cylinder head water jacket, the turbocharger and the oil cooler; the cooling medium entering the cylinder head water jacket partially enters the heater core, partially enters the EGR cooler, and the remaining cooling medium entering the cylinder head water jacket sequentially passes through the cylinder block water jacket and the radiator, and then flows back to the inlet of the electronic water pump through the main valve of the thermostat after flowing through the thermostat; the cooling medium entering the turbocharger and the oil cooler flows out after cooling the turbocharger and the oil cooler respectively, and then flows back to the electronic water pump through the third water return pipe; the cooling medium entering the heater core and the EGR cooler flows out after cooling the heater core and the EGR cooler respectively, and then flows back to the electronic water pump through the second water return pipe.

[0013] Advantages of the present application:

[0014] The engine cooling system disclosed by the present application improves and optimizes the structure of the cooling system and the circulation mode of the cooling medium, so that only the cooling medium of the cylinder head participates in the circulation during the warming-up process, the temperature rises rapidly, which is beneficial to emission and winter heating, and the rapid warming-up function after cold start is also realized; it is beneficial to reduce the emission pollution during the warming-up process; the temperature fluctuation of the cylinder block water jacket and the cylinder head water jacket is small due to the regulation and control of the thermostat, the combustion consistency is stable, and the working efficiency of the engine is higher and the economy is better. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The figure is a structural schematic diagram of the cooling system of the present application. DETAILED DESCRIPTION

[0016] Figure 1The figure is a schematic diagram of the cooling system structure of the present application, that is, a principle diagram and medium flow direction diagram of the cooling system of the present application, wherein the arrow shown in the figure is the flow direction of the cooling medium, E water pump in the figure is an electronic water pump, Heatcore is a warm air core, EGR-Cooler is an EGR cooler, 1 is a main valve of a temperature regulator, 2 is a secondary valve of the temperature regulator, and 3 is an outlet of the temperature regulator. Meanwhile, in the embodiment, each component such as a radiator is provided with an outlet and an inlet in a conventional manner, which can be understood by those skilled in the art, and will not be described herein.

[0017] It should be noted that in the description of the present application, the terms "upper", "lower", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the present embodiment, if not otherwise specified, connection, communication and the like are formed by a pipeline or other components connected to form a pipeline.

[0018] As shown in Figure 1 The present application discloses a cooling system of an engine, which comprises an electronic water pump, a water jacket assembly, a pipeline assembly, a temperature regulator and a radiator. The water jacket assembly is composed of a cylinder head water jacket and a cylinder body water jacket which are in communication with each other. The pipeline assembly comprises a water pump outlet pipe, a first return pipe, a cylinder body outlet pipe, a radiator outlet pipe and a cylinder head outlet pipe I. The temperature regulator has a main valve, a secondary valve and an outlet. The water pump outlet pipe is connected to the outlet of the electronic water pump and the inlet of the cylinder head water jacket. The cylinder body outlet pipe is connected to the outlet of the cylinder body water jacket and the inlet of the radiator. One end of the radiator outlet pipe is connected to the outlet of the radiator, and the other end is connected to the main valve of the temperature regulator. The cylinder head outlet pipe I is connected to the cylinder head water jacket and the secondary valve of the temperature regulator. One end of the first return pipe is connected to the outlet of the temperature regulator, and the other end is connected to the inlet of the electronic water pump. The electronic water pump, the water jacket assembly, the temperature regulator and the radiator are connected to form a closed circulation loop through the pipeline assembly, so that the cooling medium forms a circulation and realizes engine heat dissipation.

[0019] In the present embodiment, a warm air core and an EGR cooler are further included. The pipeline assembly further comprises a second return pipe. The cylinder head water jacket is further provided with a cylinder head outlet pipe II and a cylinder head outlet pipe III. The cylinder head water jacket is connected to the inlet of the warm air core through the cylinder head outlet pipe II, and is connected to the inlet of the EGR cooler through the cylinder head outlet pipe III. The outlet of the warm air core and the outlet of the EGR cooler are both connected to the inlet of the second return pipe. The outlet of the second return pipe is connected to the electronic water pump.

[0020] In the embodiment, the engine cooling system further comprises an oil cooler and a turbocharger, the pipeline assembly further comprises a third return water pipe, the inlet of the oil cooler and the inlet of the turbocharger are connected to the outlet of the water pump, the outlet of the oil cooler and the outlet of the turbocharger are connected to the inlet of the third return water pipe, and the outlet of the third return water pipe is connected to the inlet of the electronic water pump.

[0021] In the embodiment, the engine cooling system further comprises an expansion tank, the pipeline assembly further comprises a degassing pipe I and a degassing pipe II, the expansion tank is provided with a water inlet I, a water inlet II and a water outlet, the cylinder head water jacket is connected to the water inlet I of the expansion tank through the degassing pipe I, the outlet of the EGR cooler is connected to the water inlet II of the expansion tank through the degassing pipe II, and the outlet of the expansion tank is connected to the second return water pipe.

[0022] In the embodiment, the electronic water pump, the water jacket assembly, the thermostat, the radiator, the heater core, the EGR cooler, the oil cooler, the turbocharger and the expansion tank are connected through the pipeline assembly and form multiple closed circulation loops, the electronic water pump is the driving source of the flow of the cooling medium in the cooling system, under the pumping of the electronic water pump, the cooling medium is sent to each component to achieve the purpose of cooling and heat exchange, and finally returns to the electronic water pump to form a circulation.

[0023] In the embodiment, the engine cooling system comprises at least a circulation mode I, a circulation mode II and a circulation mode III, the outlet water temperature of the cooling medium is less than 82℃, that is, the circulation mode I of the engine cooling system is started under the engine cold start condition, the outlet water temperature of the cooling medium is not less than 82℃ and not higher than 95℃, the circulation mode II of the engine cooling system is started, and the outlet water temperature of the cooling medium is higher than 95℃, the circulation mode III of the engine cooling system is started. In the embodiment, the outlet water temperature of the cooling medium refers to the initial opening temperature of the thermostat, which can be understood by those skilled in the art and will not be described here.

[0024] In the circulation mode I, the main valve of the thermostat is closed, the auxiliary valve is fully opened, the electronic water pump is operated and the cooling medium is pumped to the cylinder head water jacket, turbocharger and oil cooler, the cooling medium entering the cylinder head water jacket partially enters the heater core and partially enters the EGR cooler, the remaining cooling medium of the cylinder head water jacket flows through the thermostat via the auxiliary valve and then enters the inlet of the electronic water pump; the cooling medium entering the turbocharger and the oil cooler flows out after cooling the turbocharger and the oil cooler respectively, converges, and then flows back to the electronic water pump through the third return water pipe; the cooling medium entering the heater core and the EGR cooler flows out after cooling the heater core and the EGR cooler respectively, converges, and then flows back to the electronic water pump through the second return water pipe.

[0025] In the circulation mode II, the main valve and the auxiliary valve of the thermostat are partially opened, the electronic water pump is operated and the cooling medium is pumped to the cylinder head water jacket, turbocharger and oil cooler; the cooling medium entering the cylinder head water jacket partially enters the heater core, partially enters the EGR cooler, and partially enters the cylinder head water jacket, the remaining cooling medium of the cylinder head water jacket flows back to the inlet of the electronic water pump via the auxiliary valve after flowing through the thermostat, and the remaining cooling medium entering the cylinder head water jacket successively passes through the cylinder block water jacket and the radiator, then flows back to the inlet of the electronic water pump via the main valve after flowing through the thermostat; the cooling medium entering the turbocharger and the oil cooler flows out after cooling the turbocharger and the oil cooler respectively, converges, and then flows back to the electronic water pump through the third return water pipe; the cooling medium entering the heater core and the EGR cooler flows out after cooling the heater core and the EGR cooler respectively, converges, and then flows back to the electronic water pump through the second return water pipe.

[0026] In the circulation mode III, the main valve of the thermostat is fully opened, the auxiliary valve is closed, the electronic water pump is operated and the cooling medium is pumped to the cylinder head water jacket, turbocharger and oil cooler; the cooling medium entering the cylinder head water jacket partially enters the heater core, partially enters the EGR cooler, and the remaining cooling medium entering the cylinder head water jacket successively passes through the cylinder block water jacket and the radiator, then flows back to the inlet of the electronic water pump via the main valve after flowing through the thermostat; the cooling medium entering the turbocharger and the oil cooler flows out after cooling the turbocharger and the oil cooler respectively, converges, and then flows back to the electronic water pump through the third return water pipe; the cooling medium entering the heater core and the EGR cooler flows out after cooling the heater core and the EGR cooler respectively, converges, and then flows back to the electronic water pump through the second return water pipe.

[0027] In the embodiment, no matter the circulation mode I, the circulation mode II or the circulation mode III, the cooling medium is pumped to the cylinder head water jacket, the turbocharger and the oil cooler under the operation of the electric water pump, but it is noted that the flow of the cooling medium into the three is different, in the embodiment, the cooling medium into the cylinder head water jacket is the most, the cylinder head water jacket corresponds to a three-way valve in the embodiment, no matter which circulation mode, the cooling medium needs to be guided and distributed under the joint action of the cylinder head and the regulating valve to meet different requirements through different circulation under different working conditions.

[0028] In the embodiment, the high point of the cylinder head water jacket is arranged with the gas removal pipe I connecting the water inlet I of the expansion water tank, the high point of the EGR cooler is arranged with the gas removal pipe II connecting the water inlet II of the expansion water tank, the high point is arranged to facilitate the removal of the gas impurities mixed in the cooling medium to the expansion water tank to ensure the cooling effect of the cooling system; in the embodiment, the cooling medium in the heater core and the EGR cooler flows out of the heater core and the EGR cooler, then converges, and then flows through the access point of the gas removal pipe II, that is, the access point of the gas removal pipe II is arranged behind the heater core and the EGR cooler, it is noted that the front and back here refer to the order of the flow of the cooling medium, the first flow is the front, and the second flow is the back; at the same time, the outlet of the expansion water tank is also connected to the second return water pipe through the pipeline, the access point of the expansion water tank on the second return water pipe is close to the outlet of the second return water pipe. In the embodiment, a plurality of water temperature sensors are also arranged, the plurality of water temperature sensors are arranged in each circulation loop to detect the real-time temperature change of the cylinder head water jacket under different working conditions, the specific arrangement mode and the specific number of the water temperature sensors can be adjusted by the person skilled in the art according to the actual demand, which is not described here.

[0029] Finally, it is noted that the above embodiment is only used to illustrate the technical solutions of the present application but not limit, although the present application is described in detail with reference to the preferred embodiment, the person skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. An engine cooling system characterised in that: The engine cooling system comprises an electronic water pump, a water jacket assembly, a pipeline assembly, a temperature regulator and a radiator, the water jacket assembly is composed of a cylinder head water jacket and a cylinder body water jacket which are connected to each other, the pipeline assembly comprises a water pump outlet pipe, a first return pipe, a cylinder body outlet pipe, a radiator outlet pipe and a cylinder head outlet pipe I, the temperature regulator is provided with a main valve, a secondary valve and a water outlet, the water pump outlet pipe is connected to the outlet of the electronic water pump and the inlet of the cylinder head water jacket, the cylinder body outlet pipe is connected to the outlet of the cylinder body water jacket and the inlet of the radiator, one end of the radiator outlet pipe is connected to the outlet of the radiator and the other end is connected to the main valve of the temperature regulator, the cylinder head outlet pipe I is connected to the cylinder head water jacket and the secondary valve of the temperature regulator, one end of the first return pipe is connected to the water outlet of the temperature regulator and the other end is connected to the inlet of the electronic water pump, the electronic water pump, the water jacket assembly, the temperature regulator and the radiator are connected to form a closed circulation loop through the pipeline assembly so that the cooling medium forms a circulation and the engine is cooled. The engine cooling system comprises at least a circulation mode I, a circulation mode II and a circulation mode III. In the circulation mode I, the main valve of the temperature regulator is closed and the secondary valve is fully opened. In the circulation mode II, the main valve and the secondary valve of the temperature regulator are partially opened. In the circulation mode III, the main valve of the temperature regulator is fully opened and the secondary valve is closed.

2. The engine cooling system of claim 1, wherein: The engine cooling system further comprises a heater core and an EGR cooler, the pipeline assembly further comprises a second return pipe, the cylinder head water jacket is further provided with a cylinder head outlet pipe II and a cylinder head outlet pipe III, the cylinder head water jacket is connected to the inlet of the heater core through the cylinder head outlet pipe II and is connected to the inlet of the EGR cooler through the cylinder head outlet pipe III, the outlet of the heater core and the outlet of the EGR cooler are connected to the inlet of the second return pipe, and the outlet of the second return pipe is connected to the inlet of the electronic water pump.

3. The engine cooling system of claim 2, wherein: The engine cooling system further comprises an oil cooler and a turbocharger, the pipeline assembly further comprises a third return pipe, the inlet of the oil cooler and the inlet of the turbocharger are connected to the water pump outlet pipe, the outlet of the oil cooler and the outlet of the turbocharger are connected to the inlet of the third return pipe, and the outlet of the third return pipe is connected to the inlet of the electronic water pump.

4. The engine cooling system of claim 2, wherein: The engine cooling system further comprises an expansion tank, the pipeline assembly further comprises a degassing pipe I and a degassing pipe II, the expansion tank is provided with a water inlet I, a water inlet II and a water outlet, the cylinder head water jacket is connected to the water inlet I of the expansion tank through the degassing pipe I, the outlet of the EGR cooler is connected to the water inlet II of the expansion tank through the degassing pipe II, and the outlet of the expansion tank is connected to the second return pipe.

5. The engine cooling system of claim 4, wherein: When the outlet temperature of the cooling medium is less than 82℃, the circulation mode I of the engine cooling system is started; when the outlet temperature of the cooling medium is not less than 82℃ and not higher than 95℃, the circulation mode II of the engine cooling system is started; and when the outlet temperature of the cooling medium is higher than 95℃, the circulation mode III of the engine cooling system is started.

6. The engine cooling system of claim 5, wherein: In the circulation mode I, the electronic water pump operates and pumps the cooling medium to the cylinder head water jacket, turbocharger and oil cooler. The cooling medium entering the cylinder head water jacket partly enters the heater core and partly enters the EGR cooler. The remaining cooling medium in the cylinder head water jacket flows through the thermostat auxiliary valve and then through the thermostat, and then enters the inlet of the electronic water pump. The cooling medium entering the turbocharger and the oil cooler flows out after cooling the turbocharger and the oil cooler respectively, and then converges, and then flows back to the electronic water pump through the third return water pipe. The cooling medium entering the heater core and the EGR cooler flows out after cooling the heater core and the EGR cooler respectively, and then converges, and then flows back to the electronic water pump through the second return water pipe.

7. The engine cooling system of claim 5, wherein: In the circulation mode II, the electronic water pump operates and pumps the cooling medium to the cylinder head water jacket, turbocharger and oil cooler. The cooling medium entering the cylinder head water jacket partly enters the heater core, partly enters the EGR cooler, and partly enters the cylinder head water jacket, and then flows back to the inlet of the electronic water pump through the thermostat auxiliary valve. The remaining cooling medium entering the cylinder head water jacket successively passes through the cylinder block water jacket and the radiator, and then flows back to the inlet of the electronic water pump through the thermostat main valve. The cooling medium entering the turbocharger and the oil cooler flows out after cooling the turbocharger and the oil cooler respectively, and then converges, and then flows back to the electronic water pump through the third return water pipe. The cooling medium entering the heater core and the EGR cooler flows out after cooling the heater core and the EGR cooler respectively, and then converges, and then flows back to the electronic water pump through the second return water pipe.

8. The engine cooling system of claim 5, wherein: In the circulation mode III, the electronic water pump operates and pumps the cooling medium to the cylinder head water jacket, turbocharger and oil cooler. The cooling medium entering the cylinder head water jacket partly enters the heater core, partly enters the EGR cooler, and the remaining cooling medium entering the cylinder head water jacket successively passes through the cylinder block water jacket and the radiator, and then flows back to the inlet of the electronic water pump through the thermostat main valve. The cooling medium entering the turbocharger and the oil cooler flows out after cooling the turbocharger and the oil cooler respectively, and then converges, and then flows back to the electronic water pump through the third return water pipe. The cooling medium entering the heater core and the EGR cooler flows out after cooling the heater core and the EGR cooler respectively, and then converges, and then flows back to the electronic water pump through the second return water pipe.

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