KR101836766B1 - Engine And Cooling Method For Vehicle - Google Patents

Abstract

According to a preferred embodiment of the present invention, there is provided a cooling water circulation circuit for a vehicle, comprising: a water pump for pumping cooling water; A cylinder block installed to pass the cooling water pumped by the water pump; And a radiator that cools the cooling water that has passed through the cylinder block and transfers the cooling water to the water pump; Wherein the cylinder block includes a cylinder block body having a plurality of cylinders and a water jacket connected to the water pump for introducing the cooling water pumped by the water pump and configured to surround at least a part of the plurality of cylinders, ; And an EGR cooler insertion portion connected to the water jacket so as to allow the coolant passing through the water jacket to flow therein and formed at one side of the cylinder block main body and into which an EGR cooler is inserted so that exhaust gas of the vehicle is heat- ; The water jacket is connected to the radiator and the EGR cooler insertion unit so that some of the cooling water may be delivered to the radiator and some of the cooling water may be delivered to the EGR cooler insertion unit, Is connected to the water pump so as to transfer the remaining part of the cooling water to the water pump.

Description

Technical Field [0001] The present invention relates to an engine,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an engine for a vehicle and a cooling method thereof, and more particularly to an engine for a vehicle having a cylinder block for cooling a recirculated exhaust gas burned and discharged from the engine and a cooling method thereof.

Emissions of automobiles include harmful substances such as carbon monoxide (CO), nitrogen oxides (NOx) and hydrocarbons (HC). The nitrogen oxides of carbon monoxide and hydrocarbons among the three elements generated in the combustion process always have an opposite causal relationship.

That is, nitrogen oxides are most abundant when carbon monoxide and hydrocarbons are most reduced in the practical output range. The higher the temperature of the engine is, the more the amount of nitrogen oxides is generated.

Accordingly, since the allowable amount of exhaust gas such as nitrogen oxides is regulated as related laws, various technologies for reducing exhaust gas have been developed. One of them is an exhaust gas recirculation (EGR).

The EGR supplies a part of the combustion gas (EGR gas) to the mixer, which is sucked into the combustion chamber, while maintaining the mixing ratio at the stoichiometric air-fuel ratio so as to reduce the amount of NOx generated without increasing the amount of other harmful substances. It is a device used as a method for lowering the temperature of the flame by increasing the heat capacity of the combustion gas.

 More specifically, the EGR is an apparatus for recirculating the exhaust gas in the exhaust gas to the intake system to reduce the combustion temperature in the cylinder to suppress the generation of nitrogen oxides. As a means for reducing nitrogen oxides (NOx) in the exhaust gas, a part of the exhaust gas is returned to the intake system, and the maximum temperature is lowered when the mixer is burned, thereby reducing the amount of nitrogen oxides (NOx) produced.

Among the above EGR constructions, the EGR cooler is a kind of heat exchanger that cools the exhaust gas of high temperature by using the cooling water of the engine as the refrigerant. In order to cool the EGR cooler, the EGR cooler was mounted to the outside of the cylinder block, or was installed outside the engine and cooled.

Problems to be solved in the cooling method of a vehicle engine of the present invention are as follows.

First, it is to reduce vehicle vibration or engine vibration.

Secondly, there is a need to reduce the number of assemblies due to brazing between components while reducing the layout for mounting the EGR cooler.

Third, the cooling efficiency of the cylinder head and the EGR cooler is improved.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to a preferred embodiment of the present invention, there is provided a cooling water circulation circuit for a vehicle, comprising: a water pump for pumping cooling water; A cylinder block installed to pass the cooling water pumped by the water pump; And a radiator that cools the cooling water that has passed through the cylinder block and transfers the cooling water to the water pump; Wherein the cylinder block includes a cylinder block body having a plurality of cylinders and a water jacket connected to the water pump for introducing the cooling water pumped by the water pump and configured to surround at least a part of the plurality of cylinders, ; And an EGR cooler insertion portion connected to the water jacket so as to allow the coolant passing through the water jacket to flow therein and formed at one side of the cylinder block main body and into which an EGR cooler is inserted so that exhaust gas of the vehicle is heat- ; The water jacket is connected to the radiator and the EGR cooler insertion unit so that some of the cooling water may be delivered to the radiator and some of the cooling water may be delivered to the EGR cooler insertion unit, Is connected to the water pump so as to transfer the remaining part of the cooling water to the water pump.

Preferably, the radiator includes a heater core that receives some of the cooling water from the water jacket and transfers the cooling water to the water pump.

Preferably, the cylinder block body includes: an inlet connected to the water pump such that the cooling water pumped by the water pump flows into the water jacket; And a supply port connected to the EGR cooler insertion portion such that the remaining part of the cooling water that has passed through the water jacket flows into the EGR cooler insertion portion

Preferably, the EGR cooler inserting unit includes: a cooling water flow path connected to the supply port so that the remaining part of the cooling water flows; And a discharge port connected to the water pump, through which the remaining part of the cooling water passed through the cooling water flow path is discharged.

Preferably, the cooling water flow path is installed so as to surround the EGR cooler so that the remaining part of the cooling water and the exhaust gas exchange heat.

According to the vehicle engine and the cooling method of the present invention, one or more of the following effects can be obtained.

First, according to the vehicle engine and the cooling method thereof according to an embodiment of the present invention, there is an effect that vibration of a vehicle or vibration generated in peripheral parts such as an engine can be reduced.

Secondly, according to the vehicle engine and the cooling method therefor, it is possible to reduce a layout for mounting the EGR cooler and reduce the number of assembling operations due to the brazing between the components .

Thirdly, according to the vehicle engine and the cooling method thereof according to an embodiment of the present invention, the cooling efficiency is improved by cooling the cylinder head and the EGR cooler.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a block diagram showing the circulation of exhaust gas and cooling water of an engine for a vehicle according to an embodiment of the present invention.
2 is a perspective view showing an engine for a vehicle according to an embodiment of the present invention.
3 is a top view of a cylinder block of an engine for a vehicle according to an embodiment of the present invention shown in Fig.
FIG. 4 is a perspective view showing a cylinder block of an engine for a vehicle according to an embodiment of the present invention shown in FIG. 2 from below; FIG.
5 is a front view showing a part of a cylinder block of an engine for a vehicle according to an embodiment of the present invention shown in Fig. 2;
FIG. 6 is a left side view showing a part of a cylinder block of an engine for a vehicle according to an embodiment of the present invention shown in FIG. 2;
7 is a flowchart showing an engine cooling method for a vehicle according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings for explaining a vehicle engine and a cooling method thereof according to embodiments of the present invention.

2 is a perspective view showing an engine for a vehicle according to an embodiment of the present invention, and Fig. 3 is a sectional view of the engine shown in Fig. 2 Fig. 4 is a perspective view showing a cylinder block of a vehicle engine according to an embodiment of the present invention shown in Fig. 2 from the lower side, Fig. 5 is a cross-sectional view of the cylinder block of Fig. 2 Fig. 6 is a left side view showing a part of a cylinder block of an engine for a vehicle according to an embodiment of the present invention in Fig. 2; Fig. 6 is a front view showing a part of a cylinder block of an engine for a vehicle according to an embodiment of the present invention.

A preferred vehicle engine may be modified by a person having ordinary skill in the art, and in the present embodiment is a case of a vehicle engine and its cooling method.

1 to 6, a vehicle engine according to an embodiment of the present invention includes a cylinder block 1 in which water jackets 16a and 16b through which cooling water flows are formed and form a skeleton of the engine .

The cylinder block 1 is provided with a plurality of cylinders 18 for mounting a piston and a cylinder block body 10 having an EGR cooler insertion portion 20 into which the EGR cooler 30 is inserted.

The cylinder block body 10 has a plurality of cylinders 18 formed in series along the longitudinal direction of the cylinder block body 10. The cylinder block 1 is provided with an EGR cooler 30 so that the exhaust gas of the vehicle exchanges heat with the water jackets 16a and 16b. The EGR cooler 30 is inserted into the EGR cooler injection unit 20. The EGR cooler insertion portion 20 is integrally formed in the longitudinal direction of the cylinder block body 10. [

The cylinder block body 10 may be provided with an inlet 14 through which cooling water flows. The cylinder block main body 10 may be provided with a supply port 12 for supplying cooling water introduced through the inlet 14 to the EGR cooler insertion portion 20. [

The cylinder block body 10 may be provided with water jackets 16a and 16b to cool a plurality of cylinders 18 reciprocating up and down. The water jackets 16a and 16b form a circulating flow path 16b for heat exchange with all of the plurality of cylinders 18 and a direct flow path 16a for heat exchange with only one of the plurality of cylinders 10a.

The supply port 12 may be formed at a point where a circulation flow path 16b, which will be described later, and a direct flow path 16a meet. The supply port 12 is penetrated to discharge the cooling water toward the direction in which the EGR cooler 30 is inserted.

The water jackets 16a and 16b are supplied with cooling water through the inlet 14 and circulated. A part of the cooling water flowing into the water jackets 16a and 16b is discharged through the supply port 12 to the circulation flow path 16b. The water jackets 16a and 16b are formed in an arc shape surrounding the outer circumference of a plurality of cylinders 18 to be heat-exchanged. Here, the central angle of the direct flow path 16a may be 90 degrees or more and 180 degrees or less. The circulation flow passage 16b flows outside the plurality of cylinders 18 to heat exchange with all of the plurality of cylinders 18. [

The EGR cooler insertion portion 20 may be formed in a long U-shape in the left-right direction. The EGR cooler insertion portion 20 may be formed long in the lateral direction along the longitudinal direction of the cylinder block body 10. The EGR cooler insertion portion 20 may be formed according to the shape of the EGR cooler 30.

The EGR cooler insertion portion 20 integrally extends to the cylinder block body 10 along the direction of the supply port 12 to form the EGR cooler insertion portion main body 22. [ Accordingly, the EGR cooler insertion portion main body 22 is inserted into the EGR cooler 30 so as to be fixedly supported.

The EGR cooler insertion portion 20 may be formed with a discharge port 24 through which cooling water heat-exchanged with the EGR cooler 30 is discharged. According to an embodiment of the present invention, the discharge port 24 may be formed on the side surface of the EGR cooler insertion portion main body 22. [ At this time, the discharge port 24 may be formed so as to be discharged in a direction perpendicular to the flow direction of the cooling water discharged from the supply port 14.

The EGR cooler 30 includes a cooler cover that covers the EGR cooler insertion portion 20 and a gas tube that is installed to exchange heat with the coolant in the cooler cover.

A plurality of through holes 32 and 34 are formed in the cooler cover (not shown). The plurality of through holes 32 and 34 are formed with a first through hole 32 through which exhaust gas flows and a second through hole 34 through which the gas introduced from the first through hole 32 is discharged. Generally, the first through hole 32 is connected to the exhaust manifold, and the second through hole 34 is connected to the intake manifold. The first through-hole 32 and the second through-hole 34 are provided with gas tubes. These gas tubes can be installed toward the cylinder block body 10. [

The EGR cooler 30 is cooled in a circulation process in which the exhaust gas flowing in the first through hole 32 is discharged through the second through hole 34. The EGR cooler 30 is inserted into the EGR cooler insertion unit 20 through a U-shaped pipe, and has a first through hole 32 through which exhaust gas flows into one side and a second through hole 32 through which a gas heat- A hole 34 may be disposed.

An EGR valve (not shown) is provided in the second through hole 34 so as to be openable and closable so that the exhaust gas can flow under the control of the EGR valve only in revolutions other than the revolutions and the warm-up.

The EGR cooler 30 is inserted into the EGR cooler insertion portion 20 and is formed with a cooling water flow passage 20a spaced apart from the outer wall of the cylinder block body 10 by a predetermined distance and through which cooling water flows. The EGR cooler 30 is cooled by the cooling water flowing through the cooling water flow path 20a.

The operation of the vehicle engine and the cooling method according to the present invention constructed as above will be described as follows.

2 is a perspective view showing an engine for a vehicle according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the engine of FIG. 2, FIG. 7 is a flowchart showing a method for cooling an engine for a vehicle according to an embodiment of the present invention. FIG. 7 is a flowchart illustrating a method for cooling an engine for a vehicle according to an embodiment of the present invention.

The operation of the engine for a vehicle according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 and 7. The cylinder block body 10 receives high temperature combustion gas heat directly during engine startup, High heat conductivity, and high cooling effect. Therefore, the cooling water is circulated in the cylinder block body 10 in order to prevent it from being adhered by the heat of combustion.

The cooling water is cooled through the HTR core of the radiator 5 and then moved to the water jackets 16a and 16b of the cylinder block body 10 by the water pump (S10).

At this time, the cooling water flows in through the inlet 14 communicating with the radiator 5 and the water jackets 16a, 16b in the cylinder block body 10. [ The cooling water flows to the circulating flow path 16b of the branched water jackets 16a and 16b (S20). Accordingly, the cooling water is heat-exchanged with a part of the cylinder head (not shown) and then discharged to the supply port 12. The cooling water that has been heat-exchanged with the cylinder head through the circulating flow path 16b is discharged to the outside of the cylinder block body 10 and flows to the heater core (HTR core) of the radiator 5 (S40). The cooling water is supplied again to the water jackets 16a and 16b by the water pump together with the cooling water heat-exchanged with the EGR cooler 30 and circulated (S50).

On the other hand, the cooling water flowing into the water jackets 16a and 16b flows to the direct oil passage 16a (S30). The cooling water flows into the supply port 12 faster than the circulating flow path 16b through the direct flow path 16a. The cooling water introduced through the supply port 12 is heat-exchanged with the EGR cooler 30 (S33). The cooling water heat-exchanged with the EGR cooler 30 is discharged through the discharge port 22 (S36). The heat-exchanged cooling water is introduced into the water jackets 16a and 16b together with the cooling water that has passed through the circulation flow path 16b through a water pump (not shown) (S36).

Here, the cooling water that has passed through the direct flow passage 16a is burnt in the engine through the first through hole 32 of the EGR cooler 30 to cool the exhaust gas that has risen. Therefore, the cooling water lowers the temperature of the exhaust gas of the EGR cooler 30, and the lower exhaust gas is sent back to the second through hole 34 through the EGR valve.

Since the EGR cooler 30 is integrally formed with the cylinder block body 10 as described above, it is possible to reduce a layout for mounting the EGR cooler. Further, since the EGR cooler 30 is inserted into the EGR cooler insertion portion 20, the vibration of the vehicle or the vibration generated in peripheral parts such as the engine can be reduced, and the number of assembling operations due to the brazing of the components can be reduced. In addition, since the cylinder head and the EGR cooler 30 are respectively cooled, the cooling efficiency is improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention.

<Detailed Description of Main Drawings>
1: Cylinder block 10: Cylinder block body
12: supply port 14: inlet
16a and 16b: a water jacket 18: a plurality of cylinders
20: EGR cooler insertion portion 22: EGR cooler insertion portion main body
24: Discharge port 30: EGR cooler
32: first through hole 34: second through hole

Claims (5)

A water pump for pumping the cooling water;
A cylinder block installed to pass the cooling water pumped by the water pump; And
And a radiator that cools the cooling water that has passed through the cylinder block and transfers the cooling water to the water pump;
Wherein the cylinder block includes:
A cylinder block main body having a plurality of cylinders and a water jacket connected to the water pump for introducing the cooling water pumped by the water pump and formed to surround at least a part of the plurality of cylinders; And
A water jacket formed on an outer surface of the cylinder block body so as to be connected to the water jacket so as to allow the cooling water passing through the water jacket to flow therethrough and an insertion space into which an EGR cooler capable of exchanging heat between the exhaust gas of the vehicle and the cooling water is inserted, And an EGR cooler inserting portion that is provided in the EGR cooler;
The water jacket is connected to the radiator and the EGR cooler insertion unit so that cooling water of any one of the cooling water may be delivered to the radiator and remaining cooling water may be delivered to the EGR cooler insertion unit,
Wherein the EGR cooler insertion unit is connected to the water pump so as to transfer the remaining part of the cooling water to the water pump. The method according to claim 1,
Wherein the radiator has a heater core that receives some of the cooling water from the water jacket and transfers the cooling water to the water pump. The method according to claim 1,
The cylinder block body includes:
An inlet port connected to the water pump such that the cooling water pumped by the water pump flows into the water jacket; And
Further comprising a supply port connected to the EGR cooler insertion portion such that the remaining part of the cooling water passed through the water jacket flows into the EGR cooler insertion portion. The method of claim 3,
Wherein the EGR cooler insertion unit includes:
A cooling water flow path connected to the supply port so that the remaining part of the cooling water flows; And
And a discharge port connected to the water pump and through which the remaining part of the cooling water passed through the cooling water flow path is discharged. 5. The method of claim 4,
Wherein the cooling water flow path is provided so as to surround the EGR cooler so that the remaining part of the cooling water and the exhaust gas exchange heat.

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