阅读说明：本技术 排气歧管及设有该排气歧管的发动机系统 (Exhaust manifold and engine system provided with same ) 是由 洪承祐 秋东昊 韩东熙 权祥旭 安吉铉 李官熙 吴熙昌 朴泳燮 姜宰求 朴成峯 于 2019-11-27 设计创作，主要内容包括：本发明提供一种排气歧管及设有该排气歧管的发动机系统,所述排气歧管包括分别连接到顺序设置在发动机中的第一汽缸至第四汽缸的第一排气管至第四排气管,排气歧管包括：第一排气歧管,其包括连接到第二汽缸的第二排气管和连接到第三汽缸的第三排气管；第二排气歧管,其包括连接到所述第一汽缸的所述第一排气管、连接到所述第四汽缸和所述第一排气管的所述第四排气管、以及安装在所述第一排气管中的再循环阀设备；其中,所述第二排气管和所述第三排气管直接连接到用于安装催化转化器的转化器壳体,在所述催化转化器中将排气净化,并且所述第四排气管在所述再循环阀设备的上游连接到所述第一排气管,并且所述第一排气管直接连接到所述转化器壳体。(The present invention provides an exhaust manifold and an engine system provided with the same, the exhaust manifold including first to fourth exhaust pipes connected to first to fourth cylinders sequentially provided in an engine, respectively, the exhaust manifold including: a first exhaust manifold including a second exhaust pipe connected to the second cylinder and a third exhaust pipe connected to the third cylinder; a second exhaust manifold including the first exhaust pipe connected to the first cylinder, the fourth exhaust pipe connected to the fourth cylinder and the first exhaust pipe, and a recirculation valve device installed in the first exhaust pipe; wherein the second exhaust pipe and the third exhaust pipe are directly connected to a converter case for mounting a catalytic converter in which exhaust gas is purified, and the fourth exhaust pipe is connected to the first exhaust pipe upstream of the recirculation valve device, and the first exhaust pipe is directly connected to the converter case.)

1. An exhaust manifold including first to fourth exhaust pipes connected to first to fourth cylinders mounted in series in an engine, respectively, characterized by comprising:

a first exhaust manifold including a second exhaust pipe connected to the second cylinder and a third exhaust pipe connected to the third cylinder;

a second exhaust manifold including a first exhaust pipe connected to the first cylinder, a fourth exhaust pipe connected to the fourth cylinder and the first exhaust pipe, and a recirculation valve device installed in the first exhaust pipe;

wherein the second exhaust pipe and the third exhaust pipe are fixedly connected to a converter case for mounting a catalytic converter in which exhaust gas is purified, and

wherein the fourth exhaust pipe is connected to the first exhaust pipe upstream of the recirculation valve arrangement, and the first exhaust pipe is fixedly connected to the converter housing.

2. The exhaust manifold according to claim 1,

wherein the recirculation valve device includes a three-way valve in which exhaust gas discharged from the first cylinder and the fourth cylinder is discharged to the catalytic converter, or exhaust gas discharged from the first cylinder and the fourth cylinder is supplied to the first cylinder and the fourth cylinder again.

3. The exhaust manifold according to claim 2, wherein said recirculation valve arrangement comprises:

a valve body installed in the first exhaust pipe, the valve body including:

an exhaust gas inlet;

an exhaust outlet formed at a downstream portion of the exhaust inlet; and

an exhaust passage connecting the exhaust gas inlet and the exhaust gas outlet; an exhaust gas recirculation outlet formed in the valve body and in fluid communication with a recirculation line in which exhaust gas supplied to the first cylinder and the fourth cylinder flows; and

a valve flap rotatably installed in the exhaust passage and selectively opening or closing the exhaust outlet or the exhaust gas recirculation outlet.

4. The exhaust manifold according to claim 3,

wherein, in response to the first to fourth cylinder actuations, the valve flap is configured to rotate to open the exhaust gas outlet and close the exhaust gas recirculation outlet such that exhaust gas discharged from the first and fourth exhaust pipes is discharged to the catalytic converter.

5. The exhaust manifold according to claim 3 wherein the first and fourth cylinders deactivate in response to the second and third cylinders actuating, the valve flap is configured to rotate to close the exhaust gas outlet and open the exhaust gas recirculation outlet such that exhaust gas exhausted from the first and fourth exhaust pipes is exhausted to the exhaust gas recirculation outlet.

6. An engine system, comprising:

an engine provided with first to fourth cylinders in sequence for generating a driving torque;

an intake manifold having a first intake manifold connected to an intake line and distributing intake air to a first predetermined cylinder of the first to fourth cylinders and a second intake manifold connected to the first intake manifold and distributing intake air to a second predetermined cylinder of the first to fourth cylinders;

an exhaust manifold having a first exhaust manifold connected to the first predetermined cylinder connected to the first intake manifold and a second exhaust manifold connected to the second predetermined cylinder connected to the second intake manifold;

a recirculation line that branches from the second exhaust manifold and is connected to the second intake manifold;

wherein the exhaust manifold includes first to fourth exhaust pipes connected to the first to fourth cylinders, respectively,

wherein the exhaust manifold includes:

a first exhaust manifold including a second exhaust pipe connected to a second cylinder of the first predetermined cylinders and a third exhaust pipe connected to a third cylinder of the first predetermined cylinders, wherein the second exhaust pipe and the third exhaust pipe are fixedly connected to a converter case for mounting a catalytic converter that purifies exhaust gas; and

a second exhaust manifold including a first exhaust pipe connected to a first cylinder of the second predetermined cylinders, a fourth exhaust pipe connected to a fourth cylinder of the second predetermined cylinders and the first exhaust pipe, and a recirculation valve device installed in the first exhaust pipe,

wherein the fourth exhaust pipe is connected to the recirculation valve arrangement at an upstream portion of the first exhaust pipe, and the first exhaust pipe is fixedly connected to the converter housing.

7. The engine system according to claim 6, wherein the engine is a hybrid engine,

wherein the recirculation valve device includes a three-way valve in which exhaust gas discharged from the first cylinder and the fourth cylinder is discharged to the catalytic converter, or exhaust gas discharged from the first cylinder and the fourth cylinder is resupplied to the first cylinder and the fourth cylinder through the recirculation line.

8. The engine system of claim 7, wherein the recirculation valve arrangement comprises:

a valve body that is mounted in the first exhaust pipe, and in which an exhaust gas inlet, an exhaust gas outlet formed at a downstream portion of the exhaust gas inlet, and an exhaust gas passage that connects the exhaust gas inlet and the exhaust gas outlet are formed;

an exhaust gas recirculation outlet formed in the valve body and in fluid communication with the recirculation line in which exhaust gas supplied to the first cylinder and the fourth cylinder flows; and

a valve flap rotatably installed in the exhaust passage and selectively opening or closing the exhaust outlet or the exhaust gas recirculation outlet.

9. The engine system according to claim 8, wherein the engine is a hybrid engine,

wherein, in response to the first to fourth cylinder actuations, the valve flap is configured to rotate to open the exhaust gas outlet and close the exhaust gas recirculation outlet such that exhaust gas discharged from the first and fourth exhaust pipes is discharged to the catalytic converter.

10. The engine system according to claim 8, wherein the engine is a hybrid engine,

wherein the valve flap is configured to rotate to close the exhaust gas outlet and open the exhaust gas recirculation outlet such that exhaust gas discharged from the first exhaust pipe and the fourth exhaust pipe is discharged to the exhaust gas recirculation outlet in response to the second cylinder and the third cylinder being deactivated.

11. An engine system, comprising:

an engine provided with first to fourth cylinders in sequence for generating a driving torque;

an intake manifold having a first intake manifold connected to an intake line and distributing intake air to a first predetermined cylinder of the first to fourth cylinders and a second intake manifold connected to the first intake manifold and distributing intake air to a second predetermined cylinder of the first to fourth cylinders;

an exhaust manifold having a first exhaust manifold connected to the first predetermined cylinder connected to the first intake manifold and a second exhaust manifold connected to the second predetermined cylinder connected to the second intake manifold;

a recirculation line that branches from the second exhaust manifold and is connected to the second intake manifold;

a turbocharger including a turbine rotated by exhaust gas discharged from the first exhaust manifold and a compressor mounted on an intake line upstream of the first intake manifold and rotated together with the turbine; and

an electric supercharger installed in the intake line between the first intake manifold and the compressor and including a motor and an electric compressor operated by the motor to supply compressed air to the first to fourth cylinders;

wherein the exhaust manifold includes first to fourth exhaust pipes connected to the first to fourth cylinders, respectively,

wherein the exhaust manifold includes:

a first exhaust manifold including the second exhaust pipe connected to a second cylinder of the first predetermined cylinders and a third exhaust pipe connected to a third cylinder of the first predetermined cylinders, wherein the second exhaust pipe and the third exhaust pipe are fixedly connected to a converter case for mounting a catalytic converter that purifies exhaust gas; and

a second exhaust manifold including the first exhaust pipe connected to the first cylinder of the second predetermined cylinders, the fourth exhaust pipe connected to the fourth cylinder of the second predetermined cylinders and the first exhaust pipe, and a recirculation valve device installed in the first exhaust pipe,

wherein the fourth exhaust pipe is connected to the recirculation valve apparatus at an upstream portion of the first exhaust pipe, and the first exhaust pipe is fixedly connected to the converter housing.

12. The engine system according to claim 11, wherein the engine is a hybrid engine,

wherein the recirculation valve device includes a three-way valve in which exhaust gas discharged from the first cylinder and the fourth cylinder is discharged to the catalytic converter, or exhaust gas discharged from the first cylinder and the fourth cylinder is resupplied to the first cylinder and the fourth cylinder through the recirculation line.

13. The engine system of claim 12, wherein the recirculation valve arrangement comprises:

a valve body that is mounted in the first exhaust pipe, and in which an exhaust gas inlet, an exhaust gas outlet formed at a downstream portion of the exhaust gas inlet, and an exhaust gas passage that connects the exhaust gas inlet and the exhaust gas outlet are formed;

an exhaust gas recirculation outlet formed in the valve body and in fluid communication with the recirculation line in which exhaust gas supplied to the first cylinder and the fourth cylinder flows; and

a valve flap rotatably installed in the exhaust passage and selectively opening or closing the exhaust outlet or the exhaust gas recirculation outlet.

14. The engine system according to claim 13, wherein the engine is a hybrid engine,

wherein, in response to the first to fourth cylinder actuations, the valve flap is configured to rotate to open the exhaust gas outlet and close the exhaust gas recirculation outlet such that exhaust gas discharged from the first and fourth exhaust pipes is discharged to the catalytic converter.

15. The engine system according to claim 13, wherein the engine is a hybrid engine,

wherein the valve flap is configured to rotate to close the exhaust gas outlet and open the exhaust gas recirculation outlet such that exhaust gas discharged from the first exhaust pipe and the fourth exhaust pipe is discharged to the exhaust gas recirculation outlet in response to the second cylinder and the third cylinder being deactivated.

Technical Field

The present invention relates to an exhaust manifold and an engine system provided with the same, and more particularly, to an exhaust manifold applied to an engine system configured to achieve a cylinder deactivation effect without using a separate cylinder deactivation apparatus.

Background

Generally, an internal combustion engine generates power by supplying fuel and air to cylinders and combusting the fuel and air in the cylinders. When air is taken in, the intake valve is operated by the drive of the camshaft, and air is taken into the cylinder while the intake valve is opened. Further, the exhaust valve is operated by the drive of the camshaft, and air is discharged from the cylinder while the exhaust valve is opened.

In addition, the optimal operation of the intake/exhaust valves is changed in response to the Revolutions Per Minute (RPM) of the engine. That is, the appropriate lift or valve open/close time is changed in response to the RPM of the engine. As described above, in order to perform appropriate valve operation in response to the RPM of the engine, a Variable Valve Lift (VVL) apparatus configured to provide a shape of a cam that drives a plurality of valves or operates the valves with different lifts in response to the RPM of the engine has been studied.

A cylinder deactivation device (hereinafter, CDA) conceptually similar to the VVL device generally refers to a technique of deactivating some of all cylinders during braking or cruise control. During CDA operation, fuel will be stopped from being provided to the cylinder that is to be deactivated and operation of the intake/exhaust valves will be stopped.

When some cylinders are deactivated by the CDA apparatus, pumping losses of the cylinders to be deactivated may be minimized, and losses of air supplied to the catalyst to maintain catalyst efficiency may be minimized.

For this purpose, the prior art has used a method of minimizing pumping loss and air flowing into the catalyst by using a mechanical configuration that stops driving the intake and exhaust valves.

According to the CDA apparatus of the related art, an additional mechanical configuration for stopping driving of the intake and exhaust valves is required, and thus, a main part of the engine, such as a cylinder head, needs to be replaced.

Since an additional actuator for controlling the intake/exhaust valve of each cylinder is required, the number of parts may increase, and the manufacturing cost of the vehicle may also increase.

Further, as the number of components increases, the possibility of failure of each component increases, and it is difficult to diagnose the failure of each portion.

Disclosure of Invention

Various aspects of the present invention are directed to provide an exhaust manifold applied to an engine system having an advantage in that a CDA function can be implemented without a separate mechanical construction.

The present invention provides an exhaust manifold including first to fourth exhaust pipes connected to first to fourth cylinders sequentially provided in an engine, respectively, the exhaust manifold may include: a first exhaust manifold including the second exhaust pipe connected to the second cylinder and the third exhaust pipe connected to the third cylinder; a second exhaust manifold including the first exhaust pipe connected to the first cylinder, the fourth exhaust pipe connected to the fourth cylinder and the first exhaust pipe, and a recirculation valve device installed in the first exhaust pipe; wherein the second exhaust pipe and the third exhaust pipe are directly connected to a converter housing for mounting a catalytic converter in which exhaust gas is purified, and wherein the fourth exhaust pipe is connected to the first exhaust pipe upstream of the recirculation valve device, and the first exhaust pipe is directly connected to the converter housing.

The recirculation valve device may be configured as a three-way valve in which exhaust gas discharged from the first cylinder and the fourth cylinder is discharged to the catalytic converter, or exhaust gas discharged from the first cylinder and the fourth cylinder is supplied to the first cylinder and the fourth cylinder again.

The recirculation valve apparatus may include: a valve body that is mounted in the first exhaust pipe, and in which an exhaust gas inlet, an exhaust gas outlet formed at a downstream portion of the exhaust gas inlet, and an exhaust gas passage that connects the exhaust gas inlet and the exhaust gas outlet are formed; an exhaust gas recirculation outlet formed in the valve body and communicating with a recirculation line in which exhaust gas supplied to the cylinder flows; and a valve flap rotatably installed in the exhaust passage and selectively opening or closing the exhaust outlet or the exhaust gas recirculation outlet.

When the first to fourth cylinders are actuated, the valve flap may rotate to open the exhaust gas outlet and close the exhaust gas recirculation outlet, so that the exhaust gas discharged from the first and fourth exhaust pipes is discharged to the catalytic converter.

When the second cylinder and the third cylinder are actuated and the first cylinder and the fourth cylinder are deactivated, the valve flap may rotate to close the exhaust gas outlet and open the exhaust gas recirculation outlet such that the exhaust gas discharged from the first exhaust pipe and the fourth exhaust pipe is discharged to the exhaust gas recirculation outlet.

An engine system according to various exemplary embodiments of the present invention may include: an engine provided with first to fourth cylinders in sequence for generating a driving torque by combusting a fuel; an intake manifold having a first intake manifold connected to an intake line and distributing intake air to some of the first to fourth cylinders and a second intake manifold connected to the first intake manifold and distributing intake air to the remaining cylinders of the first to fourth cylinders; an exhaust manifold having a first exhaust manifold connected to the some of the cylinders connected to the first intake manifold and a second exhaust manifold connected to the remaining cylinders connected to the second intake manifold; a recirculation line that branches from the second exhaust manifold and is connected to the second intake manifold; wherein the exhaust manifold may include first to fourth exhaust pipes connected to the first to fourth cylinders, respectively, wherein the exhaust manifold may include: a first exhaust manifold including the second exhaust pipe connected to the second cylinder and the third exhaust pipe connected to the third cylinder, wherein the second exhaust pipe and the third exhaust pipe are directly connected to a converter case for mounting a catalytic converter that purifies exhaust gas; and a second exhaust manifold including the first exhaust pipe connected to the first cylinder, the fourth exhaust pipe connected to the fourth cylinder and the first exhaust pipe, and a recirculation valve device installed in the first exhaust pipe, wherein the fourth exhaust pipe is connected to the recirculation valve device at an upstream portion of the first exhaust pipe, and the first exhaust pipe is directly connected to the converter case.

The recirculation valve device may be configured as a three-way valve in which exhaust gas discharged from the first cylinder and the fourth cylinder is discharged to the catalytic converter, or exhaust gas discharged from the first cylinder and the fourth cylinder is supplied to the first cylinder and the fourth cylinder again.

The recirculation valve apparatus may include: a valve body that is mounted in the first exhaust pipe, and in which an exhaust gas inlet, an exhaust gas outlet formed at a downstream portion of the exhaust gas inlet, and an exhaust gas passage that connects the exhaust gas inlet and the exhaust gas outlet are formed; an exhaust gas recirculation outlet formed in the valve body and communicating with a recirculation line in which exhaust gas supplied to the cylinder flows; and a valve flap rotatably installed in the exhaust passage and selectively opening or closing the exhaust outlet or the exhaust gas recirculation outlet.

When the first to fourth cylinders are actuated, the valve flap may rotate to open the exhaust gas outlet and close the exhaust gas recirculation outlet, so that the exhaust gas discharged from the first and fourth exhaust pipes is discharged to the catalytic converter.

When the second cylinder and the third cylinder are actuated and the first cylinder and the fourth cylinder are deactivated, the valve flap may rotate to close the exhaust gas outlet and open the exhaust gas recirculation outlet such that the exhaust gas discharged from the first exhaust pipe and the fourth exhaust pipe is discharged to the exhaust gas recirculation outlet.

An engine system according to various exemplary embodiments of the present invention may include: an engine provided with first to fourth cylinders in sequence for generating a driving torque by combusting a fuel; an intake manifold having a first intake manifold connected to an intake line and distributing intake air to some of the first to fourth cylinders and a second intake manifold connected to the first intake manifold and distributing intake air to the remaining cylinders of the first to fourth cylinders; an exhaust manifold having a first exhaust manifold connected to the some of the cylinders connected to the first intake manifold and a second exhaust manifold connected to the remaining cylinders connected to the second intake manifold; a recirculation line that branches from the second exhaust manifold and is connected to the second intake manifold; a turbocharger including a turbine that rotates by exhaust gas discharged from the first exhaust manifold, and a compressor that is provided on an intake line upstream of the first intake manifold and rotates together with the turbine; and an electric supercharger installed in the intake line between the first intake manifold and the compressor, and the compressor may include a motor and an electric compressor operated by the motor to supply compressed air to cylinders; wherein the exhaust manifold may include first to fourth exhaust pipes connected to the first to fourth cylinders, respectively, the exhaust manifold may include: a first exhaust manifold including the second exhaust pipe connected to the second cylinder and the third exhaust pipe connected to the third cylinder, wherein the second exhaust pipe and the third exhaust pipe are directly connected to a converter case for mounting a catalytic converter that purifies exhaust gas; and a second exhaust manifold including the first exhaust pipe connected to the first cylinder, the fourth exhaust pipe connected to the fourth cylinder and the first exhaust pipe, and a recirculation valve device installed in the first exhaust pipe, wherein the fourth exhaust pipe is connected to the recirculation valve device at an upstream portion of the first exhaust pipe, and the first exhaust pipe is directly connected to the converter case.

The recirculation valve device may be configured as a three-way valve in which exhaust gas discharged from the first cylinder and the fourth cylinder is discharged to the catalytic converter, or exhaust gas discharged from the first cylinder and the fourth cylinder is supplied again to the first cylinder to the fourth cylinder.

The recirculation valve apparatus may include: a valve body that is mounted in the first exhaust pipe, and in which an exhaust gas inlet, an exhaust gas outlet formed at a downstream portion of the exhaust gas inlet, and an exhaust gas passage that connects the exhaust gas inlet and the exhaust gas outlet are formed; an exhaust gas recirculation outlet formed in the valve body and communicating with a recirculation line in which exhaust gas supplied to the cylinder flows; and a valve flap rotatably installed in the exhaust passage and selectively opening or closing the exhaust outlet or the exhaust gas recirculation outlet.

When the first to fourth cylinders are actuated, the valve flap may rotate to open the exhaust gas outlet and close the exhaust gas recirculation outlet, so that the exhaust gas discharged from the first and fourth exhaust pipes is discharged to the catalytic converter.

When the second cylinder and the third cylinder are actuated and the first cylinder and the fourth cylinder are deactivated, the valve flap may rotate to close the exhaust gas outlet and open the exhaust gas recirculation outlet such that the exhaust gas discharged from the first exhaust pipe and the fourth exhaust pipe is discharged to the exhaust gas recirculation outlet.

According to the exhaust manifold applied to the engine system according to the exemplary embodiment of the present invention, it is possible to reduce the number of parts and save the manufacturing cost of the vehicle by implementing the CDA function without a separate mechanical configuration.

Other features and advantages of the methods and apparatus of the present invention will be more particularly apparent from or elucidated with reference to the drawings described herein, and subsequently, described in conjunction with the accompanying drawings, which serve to explain certain principles of the invention.

Drawings

Fig. 1 is a schematic diagram exemplarily showing an engine system according to an exemplary embodiment of the present invention.

Fig. 2 is a perspective view exemplarily showing an exhaust manifold applied to an engine system according to an exemplary embodiment of the present invention.

Fig. 3 is a perspective view exemplarily showing an exhaust manifold according to an exemplary embodiment of the present invention taken along different directions thereof.

Fig. 4 is a perspective view exemplarily illustrating a recirculation valve apparatus according to an exemplary embodiment of the present invention.

Fig. 5 is a perspective view exemplarily illustrating a recirculation valve apparatus according to an exemplary embodiment of the present invention taken along different directions thereof.

Fig. 6A and 6B are sectional views exemplarily showing a recirculation valve apparatus according to an exemplary embodiment of the present invention.

Fig. 7 and 8 are graphs showing the operation of the engine system according to various exemplary embodiments of the present invention.

Fig. 9 is a schematic diagram exemplarily illustrating an engine system according to various exemplary embodiments of the present invention.

It should be understood that the drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes, will be determined in part by the particular application and environment of use contemplated.

In the drawings, like or equivalent elements of the invention are designated by reference numerals throughout the several views of the drawings.

Detailed Description

Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with the exemplary embodiments, it will be understood that this description is not intended to limit the invention to those exemplary embodiments. On the other hand, the present invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the present invention as defined by the appended claims.

Exemplary embodiments of the present application will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. Those skilled in the art will recognize that the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive. Like reference numerals refer to like elements throughout the specification.

Since the size and thickness of each component are arbitrarily shown in the drawings for convenience of explanation, the present invention is not limited to what is shown in the drawings. In addition, the thickness is exaggerated to clearly represent several parts and regions.

Hereinafter, an exhaust manifold according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, an engine system to which an exhaust manifold according to an exemplary embodiment of the present invention is applied will be described in detail.

Fig. 1 is a schematic diagram exemplarily showing an engine system according to an exemplary embodiment of the present invention.

As shown in fig. 1, an engine system according to various exemplary embodiments of the present invention may include an engine 10, which may include a plurality of cylinders 11, 12, 13, and 14 that generate driving torque by burning fuel, a plurality of intake manifolds that distribute intake air to the cylinders 11, 12, 13, and 14, and a plurality of exhaust manifolds that collect exhaust gas from the cylinders 11, 12, 13, and 14 and discharge the collected exhaust gas to an exhaust line.

The cylinders 11, 12, 13, and 14 of the engine 10 may be a four-cylinder engine including four cylinders. That is, the plurality of cylinders may include a first cylinder 11, a second cylinder 12, a third cylinder 13, and a fourth cylinder 14, which are sequentially arranged.

The plurality of intake manifolds may include a first intake manifold 31 and a second intake manifold 32. The first intake manifold 31 is connected to the intake line 20 in which the external air flows to supply the external air to some of the plurality of cylinders 11, 12, 13, and 14. The second intake manifold 32 supplies the external air to the other cylinders of the plurality of cylinders 11, 12, 13, and 14 through the first intake manifold 31.

In an example embodiment of the invention, the first intake manifold 31 supplies intake air to the second cylinder 12 and the third cylinder 13, and the second intake manifold 32 supplies intake air to the first cylinder 11 and the fourth cylinder 14.

An intake port of the first intake manifold 31 connected to the intake line 20 is provided with a throttle valve 21 that controls the flow rate of intake air, and the intake line 20 is provided with an air cleaner 23 that purifies outside air.

The plurality of exhaust manifolds may include a first exhaust manifold 100 and a second exhaust manifold 200. The first exhaust manifold 100 is connected to some of the cylinders connected to the first intake manifold 31. The second exhaust manifold 200 is connected to the other cylinders connected to the second intake manifold 32.

In an example embodiment of the invention, the exhaust gas discharged through the exhaust manifold may be discharged to the catalytic converter 55.

The catalytic converter 55 may include a Lean NOx Trap (LNT) that purifies nitrogen oxides (NOx), a diesel oxidation catalyst, and a diesel particulate filter. Alternatively, the catalytic converter 55 may include a three-way catalyst that purifies nitrogen oxides. The three-way catalyst is a catalyst that simultaneously triggers reactions of carbon monoxide, nitrogen oxides, and hydrocarbons, which are harmful components in exhaust gas, to remove carbon monoxide, nitrogen oxides, and hydrocarbons, and mainly Pd alone may be used, and a three-way catalyst based on Pt/Rh, Pd/Rh, or Pt/Pd/Rh may be used.

In an example embodiment of the invention, the second exhaust manifold 200 collects exhaust gas from the first cylinder 11 and the fourth cylinder 14 and discharges it to the catalytic converter 55, and the first exhaust manifold 100 collects exhaust gas from the second cylinder 12 and the third cylinder 13 and discharges it to the catalytic converter 55. A catalytic converter 55 is provided in the main exhaust line 50 connected to the exhaust manifolds 100 and 200.

The engine system according to various exemplary embodiments of the present invention may further include a recirculation line 60, the recirculation line 60 branching from the second exhaust manifold 200 and connecting to the second intake manifold 32.

A recirculation valve device 300 is provided in a portion where recirculation line 60 and second exhaust manifold 200 are joined, and a manifold connection valve 63 is provided between first intake manifold 31 and second intake manifold 32.

Hereinafter, an exhaust manifold applied to an engine system according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

Fig. 2 is a perspective view exemplarily showing an exhaust manifold applied to an engine system according to an exemplary embodiment of the present invention. Fig. 3 is a perspective view exemplarily showing an exhaust manifold according to an exemplary embodiment of the present invention taken along different directions thereof. Fig. 4 is a perspective view exemplarily illustrating a recirculation valve apparatus according to an exemplary embodiment of the present invention. Fig. 5 is a perspective view exemplarily illustrating a recirculation valve apparatus according to an exemplary embodiment of the present invention taken along different directions thereof. And fig. 6A and 6B are cut-away views exemplarily showing a recirculation valve apparatus according to an exemplary embodiment of the present invention.

As shown in fig. 2 to 6B, the exhaust manifold according to an exemplary embodiment of the present invention may include first to fourth exhaust pipes 210 to 240 connected to the first to fourth cylinders, respectively.

In detail, the exhaust manifold may include a first exhaust manifold 100 and a second exhaust manifold 200, the first exhaust manifold 100 including a second exhaust pipe 120 and a third exhaust pipe 130, the second exhaust manifold 200 including a first exhaust pipe 210, a fourth exhaust pipe 240, and a recirculation valve apparatus 300 installed in the first exhaust pipe 210.

The first exhaust pipe 210 may include a first vertical portion 211, a first bent portion 213, and a first extension portion 215, the first vertical portion 211 extending in an upward direction (z direction in fig. 2) of the first cylinder, the first bent portion 213 bent in a lateral direction (e.g., a direction toward the fourth exhaust pipe 240, or x direction in fig. 2) from an end of the first vertical portion 211, and the first extension portion 215 extending from an end of the first bent portion 213 toward the converter housing (y direction in fig. 2).

A recirculation valve arrangement 300 is arranged in the first exhaust pipe 210. The recirculation valve apparatus 300 may be disposed in the first curved portion 213 of the first exhaust pipe 210.

The second exhaust pipe 120 may include a second vertical portion 121 and a second bent portion 123, the second vertical portion 121 extending in an upward direction (z direction in fig. 2) of the second cylinder, the second bent portion 123 bent from an end of the second vertical portion 121 toward the converter housing (y direction in fig. 2).

The second exhaust pipe 120 is directly connected to the catalytic converter 55. The end of the second bent portion 123 of the second exhaust pipe 120 is connected to the converter case 51, so that the second exhaust pipe 120 can be directly connected to the catalytic converter 55 via the converter case 51.

The second exhaust pipe 120 includes the second vertical portion 121 and the second bent portion 123, so that the entire length of the second exhaust pipe 120 becomes long, and when some of all the cylinders are deactivated, the back pressure can be prevented from increasing.

The third exhaust pipe 130 may include a third vertical portion 131 and a third bent portion 133, the third vertical portion 131 extending in an upward direction (z direction in fig. 2) of the third cylinder, the third bent portion 133 being bent from an end of the third vertical portion 131 toward the converter housing (y direction in fig. 2).

The third exhaust pipe 130 is directly connected to the catalytic converter 55. The end of the third bent portion 133 of the third exhaust pipe 130 is connected to the converter case 51, so that the third exhaust pipe 130 can be directly connected to the catalytic converter 55 via the converter case 51.

The third exhaust pipe 130 includes the third vertical portion 131 and the third bent portion 133 so that the entire length of the third exhaust pipe 130 becomes long, and when some of all the cylinders are deactivated, the back pressure can be prevented from increasing.

The fourth exhaust pipe 240 may include a fourth vertical portion 241 and a fourth bent portion 243, the fourth vertical portion 241 extending in an upward direction (z direction in fig. 2) of the fourth cylinder, the fourth bent portion 243 being bent in a lateral direction (a direction toward the first vertical portion 211 of the first exhaust pipe 210, or an x direction in fig. 2) from an end of the fourth vertical portion 241.

The fourth exhaust pipe 240 is connected to the first exhaust pipe 210. The fourth bent portion 243 of the fourth exhaust pipe 240 is connected to the first vertical portion 211 of the first exhaust pipe 210. That is, the fourth curved portion 243 of the fourth exhaust pipe 240 is connected to the first vertical portion 211 at an upstream portion of the recirculation valve apparatus 300 provided in the first exhaust pipe 210.

The recirculation valve device 300 is configured as a three-way valve in which exhaust gas discharged from the first cylinder and the fourth cylinder is discharged to the catalytic converter, or exhaust gas discharged from the first cylinder and the fourth cylinder is resupplied to the first cylinder to the fourth cylinder.

To this end, the recirculation valve apparatus 300 may be installed in the first bent portion 213 of the first exhaust pipe 210, and the recirculation valve apparatus 300 may include a valve body 310 in which an exhaust gas inlet 311, an exhaust gas outlet 313 formed at a downstream portion of the exhaust gas inlet 311, and an exhaust passage 315 fluidly connecting the exhaust gas inlet 311 and the exhaust gas outlet 313 are formed, an exhaust gas recirculation outlet 317 formed in the valve body 310 and communicating with the recirculation line 60, exhaust gas supplied to the cylinder flowing in the recirculation line 60, and a valve flap 330 rotatably installed in the exhaust passage 315.

At this time, the exhaust inlet 311 formed in the valve body 310 communicates with one side of the first exhaust pipe 210, and the exhaust outlet 313 formed at a downstream portion of the exhaust inlet 311 communicates with the other side of the first exhaust pipe 210. That is, the exhaust passage 315 is a passage for connecting the exhaust inlet 311 and the exhaust outlet 313.

The exhaust passage 315 and the exhaust gas recirculation outlet 317 are disposed within a radius of rotation of the valve flap 330. Accordingly, the exhaust outlet 313 and the exhaust recirculation outlet 317 may be selectively opened or closed according to the rotation of the valve flap 330.

When the first to fourth cylinders are actuated, exhaust gas discharged through the second exhaust pipe 120 and the third exhaust pipe 130 is discharged to the catalytic converter, the valve flap 330 rotates to open the exhaust gas outlet 313 and close the exhaust gas recirculation outlet 317 (the valve flap rotates clockwise with reference to fig. 4), so that exhaust gas discharged through the first exhaust pipe 210 and the fourth exhaust pipe 240 is discharged to the catalytic converter.

When the second and third cylinders are actuated and the first and fourth cylinders are deactivated by the cylinder deactivation device, exhaust gas discharged through the second exhaust pipe 120 and the third exhaust pipe 130 is discharged to the catalytic converter, but the valve flap 330 rotates to close the exhaust gas outlet 313 and open the exhaust gas recirculation outlet 317 (the valve flap rotates counterclockwise with reference to fig. 4), so that exhaust gas discharged through the first exhaust pipe 210 and the fourth exhaust pipe 240 is discharged to the exhaust gas recirculation outlet 317. Accordingly, exhaust gas discharged from the first cylinder and the fourth cylinder is resupplied to the first cylinder and the fourth cylinder through the recirculation line and the second intake manifold.

Hereinafter, the operation of the engine system according to the exemplary embodiment of the present invention will be described in detail.

Referring to fig. 7, when engine 10 is operating normally (when the first to fourth cylinders are actuated), valve flap 330 of recirculation valve arrangement 300 rotates to open exhaust outlet 313 and close exhaust recirculation outlet 317. Further, the manifold connection valve 63 is opened.

Therefore, the outside air flowing from the intake line 20 into the first intake manifold 31 is supplied to the second cylinder 12 and the third cylinder 13. The external air flowing into the second intake manifold 32 through the first intake manifold 31 is supplied to the first cylinder 11 and the fourth cylinder 14.

During combustion, exhaust gas discharged from the second cylinder 12 and the third cylinder 13 is discharged to the catalytic converter through the first exhaust manifold 100. The exhaust gas discharged from the first cylinder 11 and the fourth cylinder 14 is discharged to the catalytic converter through the second exhaust manifold 200.

Referring to fig. 8, when some of all cylinders (e.g., the first cylinder and the fourth cylinder) require cylinder deactivation, for example, when the vehicle is running or coasting at a low speed and fuel is not injected into the cylinders (e.g., the first cylinder and the fourth cylinder) of the cylinder deactivation, the valve flap 330 of the recirculation valve apparatus 300 rotates to close the exhaust outlet 313 and open the exhaust recirculation outlet 317, and the manifold connection valve 63 is closed.

Accordingly, the outside air flowing from the intake line 20 into the first intake manifold 31 is supplied to the actuated cylinders (e.g., the second cylinder and the third cylinder). Exhaust gas discharged from the actuated cylinders is collected in the first exhaust manifold 100 and discharged to the outside through the catalytic converter.

However, since the first and second intake manifolds 31 and 32 are blocked by the manifold connection valve 63, external air does not flow into the second intake manifold 32 through the first intake manifold 31, and therefore, external air is not supplied to the deactivated cylinders (e.g., the first and fourth cylinders).

Also, since the first and second intake manifolds 31 and 32 are blocked by the manifold connection valve 63 and the first exhaust pipe 210 and the recirculation line communicate with each other through the recirculation valve apparatus 300, the exhaust gas discharged from the cylinder deactivated (e.g., the first and fourth cylinders) is supplied to the cylinder deactivated again.

As described above, since the intake system including the second intake manifold 32 and the exhaust system including the second exhaust manifold 200 communicate with each other, the suction pressure (Pint) and the back pressure (Pexh14) of the first cylinder 11 and the fourth cylinder 14 almost match. Thus, pumping losses of the deactivated first and fourth cylinders 11, 14 are minimized.

Further, the back pressure (Pexh23) of the actuated second and third cylinders 12 and 13 is greater than the back pressure of the deactivated first and fourth cylinders 11 and 14, the first exhaust manifold (the first exhaust pipe 210 and the fourth exhaust pipe 240) is in fluid communication with the recirculation line through the recirculation valve arrangement 300, and the relatively low temperature exhaust gas discharged from the deactivated first and fourth cylinders 11 and 14 is not discharged to the catalytic converter 55. Therefore, the temperature of the catalyst of the catalytic converter 55 can be prevented from decreasing below the activation temperature, thereby preventing the efficiency of the catalyst from decreasing.

Hereinafter, an engine system according to various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 9 is a schematic diagram exemplarily illustrating an engine system according to various exemplary embodiments of the present invention.

The basic configuration of the engine system according to various exemplary embodiments of the present invention shown in fig. 9 is the same as the above-described engine system. However, the engine system according to various exemplary embodiments of the present invention is different in that it further includes a turbocharger 70 and an electric supercharger 80, and the turbocharger 70 and the electric supercharger 80 supply the charge air to the cylinders 11, 12, 13, and 14 of the engine. Hereinafter, for convenience of explanation, the same components will be omitted and only different components will be described.

The engine system according to various exemplary embodiments of the present invention may further include a turbocharger 70 and an electric supercharger 80, and the turbocharger 70 and the electric supercharger 80 supply charge air (compressed air) to the cylinders of the engine 10.

The turbocharger 70 includes a turbine 71 and a compressor 73, the turbine 71 being provided in a supplemental exhaust line 51 connected to the second exhaust pipe 120 and the third exhaust pipe 130 to be rotated by exhaust gas, and the compressor 73 being provided on the intake line 20 upstream of the first intake manifold 31 and being rotated by coupling with the turbine 71.

The electric supercharger 80 is provided in the intake line 20 in which the outside air flows, and includes a motor 81 and an electric compressor 83 operated by the motor 81.

The intake line 20 is provided on a bypass line that bypasses some of the air supplied to the electric supercharger 80, and the bypass line is provided with a bypass valve. The amount of intake air that bypasses the electric supercharger 80 is controlled by the opening degree of the bypass valve.

As described above, the engine system according to various exemplary embodiments of the present invention may supply the charge air to the cylinders 11, 12, 13, and 14 of the engine 10 through the turbocharger 70 and the electric supercharger 80, thereby expanding the operation region of the engine 10.

The operation of the engine system according to each exemplary embodiment of the present invention is the same as that of each exemplary embodiment described above, and thus a detailed description thereof will be omitted.

Further, the exhaust manifold applied to the engine system according to each exemplary embodiment of the present invention is the same as that of each exemplary embodiment described above, and thus a detailed description thereof will be omitted.

For convenience in explanation and accurate definition in the appended claims, the terms "above", "below", "inner", "outer", "upper", "lower", "upward", "downward", "front", "rear", "back", "inside", "outside", "inward", "outward", "inner", "outer", "forward" and "rearward" are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures. It will be further understood that the term "connected," or derivatives thereof, refers to both direct and indirect connections.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. The foregoing description is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable others skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the following claims and their equivalents.