Engine system having turbocharger

An engine system having a turbocharger may include a cylinder head, at which an intake manifold and an exhaust manifold may be positioned, the turbocharger which may be connected to the exhaust manifold, an intake line formed between the turbocharger and the intake manifold to transmit compressed air compressed by the turbocharger, through the cylinder head, an intercooler disposed to be adjacent to the intake manifold to cool the compressed air supplied through the intake line, an Exhaust Gas Recirculation (EGR) line connecting the exhaust manifold and the intake manifold to recirculate the exhaust gas, to the intake manifold through the cylinder head, and an EGR cooler disposed to be adjacent to the intake manifold, wherein a low-temperature coolant supplied from a low temperature radiator to pass through the cylinder head to cool the compressed air and the EGR gas that pass through the cylinder head.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority to and the benefit of Korean Patent Application No. 10-2013-0154198 filed on Dec. 11, 2013, the entire contents of which is incorporated herein for all purposes by this reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an engine system having the turbocharger which improves output in a low-speed section using a turbocharger, and improves combustion efficiency and quality of exhaust gas.

2. Description of Related Art

In general, it is known that a diesel engine consumes less fuel and has excellent efficiency in comparison with a gasoline engine. Typically, the diesel engine exhibits efficiency of about 40%, which results from a high compression ratio of the diesel engine.

The recent engine additionally has a turbocharger, an intercooler, and the like in order to obtain higher output.

The engine to which the turbocharger is applied as described above sucks and compresses exhaust gas or external air using a compressor of the turbocharger, and supplies supercharged air (high-temperature compressed air), which is generated by the turbocharger, to an engine side.

However, the air, which is rapidly compressed, absorbs heat from the turbocharger and heat that is generated during a compression process, such that density of the air is decreased, and as a result, charging efficiency in a combustion chamber of the engine deteriorates.

Therefore, high density may be obtained by cooling the supercharged air using the intercooler, and as a result, a larger amount of air may be sucked in the combustion chamber of the engine, thereby obtaining high output.

Meanwhile, the intercooler is mounted in the middle of an intake line, and the intake line, which is formed from the intercooler to an intake manifold, is increased such that responsiveness may deteriorate, and efficiency of the intercooler may deteriorate. Moreover, since the intercooler is mounted together with an Exhaust Gas Recirculation (EGR) cooler, a cooling load is increased such that overall cooling efficiency and performance may deteriorate.

FIG. 9is a schematic diagram of an engine having an intercooler. Referring to theFIG. 9, an inlet duct900is connected to one side of an intercooler135, and an outlet duct905is connected to the other side of the intercooler135.

Intake air passes the inlet duct900, the intercooler135, and the outlet duct905to be supplied to a combustion chamber of an engine, the intake air is cooled by outside air that passes the intercooler135. Meanwhile, the intake air is cooled by the outside air, the cooling performance can be deteriorated.

BRIEF SUMMARY

Various aspects of the present invention are directed to providing an engine system having the turbocharger which stably cools high-temperature compressed air compressed by a turbocharger, reduces capacity of a water-cooled intercooler, improves responsiveness of the turbocharger, and stably cools EGR gas, thereby improving cooling efficiency and performance together.

In an aspect of the present invention, an engine system having a turbocharger, may include a cylinder head, at which an intake manifold and an exhaust manifold are positioned, the turbocharger which is connected to the exhaust manifold and compresses intake air using exhaust gas discharged from the exhaust manifold, an intake line which is formed between the turbocharger and the intake manifold so as to transmit compressed air, which is compressed by the turbocharger, through the cylinder head, an intercooler which is disposed to be adjacent to the intake manifold so as to cool the compressed air that is supplied through the intake line, an Exhaust Gas Recirculation (EGR) line connecting the exhaust manifold and the intake manifold and recirculates the exhaust gas, which is discharged from the exhaust manifold, to the intake manifold through the cylinder head, and an EGR cooler which is disposed to be adjacent to the intake manifold so as to receive an EGR gas from the EGR line and cool the EGR gas, wherein a low-temperature coolant that is supplied from a low temperature radiator to pass through the cylinder head and cools the compressed air and the EGR gas that pass through the cylinder head.

The low-temperature coolant that is supplied from the low temperature radiator circulates through a coolant line independently of an engine coolant for cooling the cylinder head.

The coolant line through which the low temperature coolant that is supplied from the low temperature radiator passes through the cylinder head so as to cool the compressed air, which passes through the cylinder head in the intake line, and the EGR gas, and then sequentially passes through the intercooler and the EGR cooler, and circulates through the low temperature radiator and a coolant pump.

The coolant line through which the low temperature coolant that is supplied from the low temperature radiator passes through the cylinder head so as to cool the compressed air, which passes through the cylinder head in the intake line, and the EGR gas, and then sequentially passes through the EGR cooler and the intercooler, and circulates through the low temperature radiator and a coolant pump.

The coolant line through which the low temperature coolant that is supplied from the low temperature radiator passes through the intercooler and the EGR cooler, and then passes through the cylinder head so as to cool the compressed air and the EGR gas that pass through the cylinder head, and circulates through a coolant pump and a Low-temperature radiator.

The intercooler and the EGR cooler are coupled to the intake manifold.

The intercooler and the EGR cooler are coupled to each other.

The EGR gas, which is cooled by the EGR cooler, is mixed with the intake air, which is cooled by the intercooler, in the intake manifold.

The EGR cooler and the intercooler are sequentially disposed in series in a flow direction in which the intake air passes through the intercooler.

The EGR cooler and the intercooler are disposed side by side and in parallel with a flow direction in which the intake air passes through the intercooler.

A compressed air passage, which passes through the cylinder head, is formed in a cylindrical shape so as to correspond to the intake line, wherein an EGR gas passage, which passes through the cylinder head, is formed in a cylindrical shape so as to corresponding to the EGR line, and wherein a low-temperature coolant passage through which the low-temperature coolant passes that is supplied from the low temperature radiator is formed at a periphery of the compressed air passage and the EGR gas passage.

According to the exemplary embodiment of the present invention, since the intake line penetrates the cylinder head instead of being formed to deviate from the cylinder head, a length of the intake line is shortened, and the compressed air is first cooled by the low-temperature coolant that passes through the cylinder head, thereby reducing a load and capacity of the intercooler.

In addition, since the EGR line penetrates the cylinder head instead of being formed to deviate from the cylinder head, a length of the EGR line is shortened, and the EGR gas is first cooled by the low-temperature coolant that passes through the cylinder head, thereby reducing a load and capacity of the EGR cooler.

Further, the EGR cooler, the intercooler, and the intake manifold are coupled, such that a length of the coolant line, which circulates through the EGR cooler, the intercooler, and the intake manifold, is shortened, overall cooling efficiency is improved, the number of components is reduced, and productivity is improved.

DETAILED DESCRIPTION

FIG. 1is a schematic configuration diagram of an engine system having the turbocharger according to a first exemplary embodiment of the present invention.

Referring toFIG. 1, an engine system having the turbocharger includes the turbocharger100including a turbine102and a compressor104, an exhaust line110, an exhaust manifold115, a cylinder head120, an intake manifold125, an EGR cooler130, an intercooler135, a Low-temperature radiator140, a coolant line160, a coolant pump145, an intake line150, and an EGR line155.

Compressed air, which is compressed by the compressor104, is supplied to the intercooler135, the intake manifold125, a combustion chamber of the cylinder head120through the intake line150, and combusted gas, which is combusted in the combustion chamber, is discharged to the outside through the exhaust manifold115, the turbine102, and the exhaust line110.

The EGR line155is formed to recirculate EGR gas from the exhaust manifold115to the EGR cooler130. The intercooler135and the EGR cooler130are disposed in series in a direction in which intake air flows.

That is, the intake air sequentially passes through the intercooler135and the EGR cooler130, and the intake air and EGR gas are mixed at a rear end portion of the intercooler135.

The compressed air, which passes through the intake line150, is supplied to the intercooler135through the cylinder head120, and the EGR gas, which passes through the EGR line, is also supplied to the EGR cooler130through the cylinder head120.

The coolant line160cools the compressed air and the EGR gas, which pass through the cylinder head120, while passing one side of the cylinder head120, and circulates through the Low-temperature radiator140and the coolant pump145after passing the intercooler135and the EGR cooler130.

FIG. 2is a partial cross-sectional view of the engine system having the turbocharger according to the first exemplary embodiment of the present invention.

Referring toFIG. 2, a compressed air passage200through which the compressed air compressed by the compressor104of the turbocharger100passes is formed in the cylinder head120, and an EGR gas passage220through which the EGR gas in the EGR line155, which is formed from the exhaust manifold115to the EGR cooler130, passes is formed in the cylinder head120.

The compressed air passage200and the EGR gas passage220are formed to be adjacent to each other, and low-temperature coolant passages210through which a low-temperature coolant passes are formed along circumferences of the compressed air passage200and the EGR gas passage220.

In the exemplary embodiment of the present invention, the low-temperature coolant flows along a separate coolant line independently of an engine coolant that cools the cylinder head120, and the engine coolant flows along an engine coolant line.

Further, in the exemplary embodiment of the present invention, the compressed air and the EGR gas are cooled by the low-temperature coolant while passing through the cylinder head120, and cooled again by the intercooler135and the EGR cooler130, thereby improving cooling efficiency, and reducing cooling loads of the intercooler135and the EGR cooler130.

FIG. 3is a schematic configuration diagram of an engine system having the turbocharger according to a second exemplary embodiment of the present invention. Elements different from the elements illustrated inFIG. 1will be described with reference toFIG. 3, but a description of elements equal or similar to the elements illustrated inFIG. 1will be omitted.

Referring toFIG. 3, the intercooler135and the EGR cooler130are disposed side by side and in parallel based on a flow direction in which intake air passes through the intercooler135. However, the low-temperature coolant sequentially passes through the intercooler135and the EGR cooler130. That is, the low-temperature coolant passes through the intercooler135, and then passes through the EGR cooler130.

FIG. 4is a partial perspective view of the engine system having the turbocharger according to the second exemplary embodiment of the present invention.

Referring toFIG. 4, the intercooler135and the EGR cooler130are coupled to each other through partition walls400, and also coupled to the intake manifold125. Therefore, the intake air passing through the intercooler135is directly supplied to the intake manifold125, and the EGR gas passing through the EGR cooler130is directly supplied to the intake manifold125through the EGR line155.

FIG. 5is a partial top plan view of the engine system having the turbocharger according to the second exemplary embodiment of the present invention.

Referring toFIG. 5, the intake air passing through the intercooler135and the EGR gas passing through the EGR cooler130and the EGR line155are mixed in the intake manifold125, and supplied to the combustion chamber.

FIG. 6is a schematic configuration diagram of an engine system having the turbocharger according to a third exemplary embodiment of the present invention. Elements different from the elements illustrated inFIG. 3will be described with reference toFIG. 6, but a description of elements equal or similar to the elements illustrated inFIG. 3will be omitted.

Referring toFIG. 6, the intercooler135and the EGR cooler130are disposed side by side and in parallel based on a flow direction in which intake air passes through the intercooler135. However, the low-temperature coolant sequentially passes through the EGR cooler130and the intercooler135. That is, the low-temperature coolant passes through the EGR cooler130, and then passes through the intercooler135.

FIG. 7is a schematic configuration diagram of an engine system having the turbocharger according to a fourth exemplary embodiment of the present invention. Elements different from the elements illustrated inFIG. 6will be described with reference toFIG. 7, but a description of elements equal or similar to the elements illustrated inFIG. 6will be omitted.

Referring toFIG. 7, the intercooler135and the EGR cooler130are disposed side by side and in parallel based on a flow direction in which intake air passes through the intercooler135.

Further, the low-temperature coolant sequentially circulates through the Low-temperature radiator140, the intercooler135, the EGR cooler130, the cylinder head120, and the coolant pump145.

FIG. 8is a partial perspective view of the engine system having the turbocharger according to the exemplary embodiment of the present invention.

Referring toFIG. 8, an exhaust manifold115is disposed at one side of the cylinder head120, and the turbocharger100is disposed to be adjacent to the exhaust manifold115.

The turbocharger100includes a turbine housing800in which the turbine102is mounted, a compressor housing810in which the compressor104is mounted, and an actuator820which controls exhaust gas flowing into the turbine102.

Further, the intake line150is formed from the turbocharger100to the cylinder head120, and the cylinder head120and the intake line150are fastened to each other through a connecting flange830.

The EGR line155is formed below the intake line150, and the EGR line155is also fastened to the cylinder head120through a flange. Therefore, the EGR line155and the intake line150may be designed to be disposed in a narrow space, and lengths of flow paths of the EGR line155and the intake line150may be shortened.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.