FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See section 10, rule 13)
“AN EXHAUST GAS RECIRCULATION DEVICE FOR AN ENGINE”
Name and Address of the Applicant: TATA MOTORS LIMITED; Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001 Maharashtra, India
[Nationality: Indian]
The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD
[001] Present disclosure relates to a field of automobiles. Particularly, the present disclosure relates to an exhaust gas recirculation device for an engine. Further, embodiments of the present disclosure relate to the exhaust gas recirculation device that imparts a uniform mixture of exhaust gas with intake air.
BACKGROUND OF THE DISCLOSURE
[002] The information in this section merely provides background information
related to the present disclosure and may not constitute prior art(s) for the present
disclosure.
[003] In internal combustion engines [herein referred to as engines], Exhaust Gas Recirculation devices [i.e EGRs] are commonly used to recirculate a certain volume of exhaust gases back into combustion chambers of the engine. The exhaust gases majorly contain pollutants such as Hydrocarbons (HC), Nitrogen Oxide (NOx), and Carbon Monoxide (CO) etc., which are harmful to human health and the environment. Conventionally, EGRs are mainly utilized and known to reduce the NOx emission from the engine. The EGRs usually include an additional pipe that is at one end connected to an exhaust manifold of the engine and the other end is connected to an intake manifold of the engine. Due to the pressure difference between the intake manifold and the exhaust manifold, part of the exhaust gases are transferred from the exhaust manifold to the intake manifold and mixed with fresh intake air passing through the intake manifold.
[004] In some cases, the existing EGRs include an EGR mixer to mix the exhaust gases into the intake air. The EGR mixer has an opening that is defined into the air intake pipe to allow the exhaust gases of the exhaust pipe to mix into stream of the intake air. However, one major drawback associated with such EGR mixers is that the EGR mixers fail to address the problem of homogenous mixing of the exhaust gases with the intake air when the pressure difference between the intake manifold and the exhaust manifold is low. At low-pressure difference, the exhaust gases entering into the air intake pipe through the opening of the EGR mixer, gets mixed with the intake air volume which is proximal to the opening of the EGR mixer, thereby non-uniform mixture of the exhaust gases and the intake air is created and supplied to combustion chambers of the engine. Further, the non-uniform mixture leads to unequal

distribution of the intake mixture in the combustion chambers that impacts the overall performance of the engine in terms of increasing the Noise, Vibration, and Harshness [NVH] of the engine.
[005] The present disclosure is directed to overcome one or more limitations stated above or any other limitations associated with the prior art.
SUMMARY OF THE DISCLOSURE
[006] The one or more shortcomings of the prior art are overcome by the system/assembly as claimed, and additional advantages are provided through the provision of the system/assembly/method as claimed in the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
[007] In one non-limiting embodiment of the present disclosure, an exhaust gas recirculation device for an engine is disclosed. The exhaust gas recirculation device comprises a conduit defined with an inlet at one end and a plurality of outlets defined on an inner circumference of the conduit. Further, the inlet is fluidly connected to an exhaust pipe of the engine and the plurality of outlets is fluidly connected to an insert. The insert is disposed within an air intake pipe of the engine. Furthermore, the conduit is configured to receive exhaust gas and generate a vortex of the exhaust gas to mix with intake air in the air intake pipe.
[008] In an embodiment of the present disclosure, the plurality of outlets are plurality of baffles.
[009] In an embodiment of the present disclosure, the plurality of baffles are positioned at a pre-defined angle to circulate the exhaust gases along an inner circumference of the air intake pipe.
[0010] In an embodiment of the present disclosure, the plurality of baffles are equidistant from each other.

[0011] In an embodiment of the present disclosure, comprising an actuator connectable to a valve, wherein the actuator operates the valve for opening and closing the exhaust pipe.
[0012] In an embodiment of the present disclosure, the conduit has an outer circumference and the inner circumference, wherein a passage is defined between the inner circumference and the outer circumference.
[0013] In an embodiment of the present disclosure, volume of the passage is reduced along an outer circumference of the air intake pipe to maintain velocity of the exhaust gases in the conduit.
[0014] In an embodiment of the present disclosure, the insert is defined with plurality of cut-outs, wherein the plurality of cut-outs matches with the plurality of outlets.
[0015] In an embodiment of the present disclosure, the insert is configured to be positioned at the inner circumference of the conduit.
[0016] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.
[0017] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0018] The novel features and characteristics of the disclosure are set forth in the description. The disclosure itself, however, as well as a preferred mode of use, further objectives, and advantages thereof, will best be understood by reference to the following description of an illustrative embodiment when read in conjunction with the accompanying drawings. One or more embodiments are now described, by way of

example only, with reference to the accompanying drawings wherein like reference numerals represent like elements and in which:
[0019] Figure 1 illustrates a perspective view of volume of EGR flow in the exhaust gas recirculation device for an engine, according to an embodiment of the present disclosure.
[0020] Figure 2 illustrates a front view of volume of EGR flow in the exhaust gas recirculation device of Figure 1.
[0021] Figure 3 illustrates a perspective view of the air intake pipe of the engine on which exhaust gas recirculation device will be mounted, according to an embodiment of the present disclosure.
[0022] Figures 4 and 5 illustrate a perspective view and a front view of an insert representing the exhaust gas recirculation device, according to an embodiment of the present disclosure.
[0023] Figures 6 and 7 illustrate a perspective view and a front view of the exhaust gas recirculation device mounted to an intake pipe of the engine, according to an embodiment of the present disclosure.
[0024] Figure 8 illustrates graphs showcasing distribution of a mixture of exhaust gas and intake air into the engine, according to an embodiment of the present disclosure.
[0025] Skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the drawings may be exaggerated relative to other elements to help to improve understanding of embodiments of the present disclosure.
DETAILED DESCRIPTION
[0026] While the disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the Figures 1 to 8. and will be described in detail below. It should be understood, however that it is not intended to limit the disclosure to the particular forms disclosed, but on

the contrary, the disclosure is to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure as defined by the appended claims.
[0027] Before describing detailed embodiments, it may be observed that the novelty and inventive step that are in accordance with the present disclosure resides in an exhaust gas recirculation device for an engine. It is to be noted that a person skilled in the art can be motivated by the present disclosure and modify the various constructions of the body structure, and the vehicle. However, such modification should be construed within the scope of the present disclosure. Accordingly, the drawings are showing only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.
[0028] In the present disclosure, the term “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any embodiment or implementation of the present subject matter described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.
[0029] The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusions, such that a device that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such setup or device. In other words, one or more elements in a system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.
[0030] The terms like “at least one” and “one or more” may be used interchangeably or in combination throughout the description.
[0031] While the present disclosure is illustrated in the context of an internal combustion engine, however, exhaust gas recirculation device and aspects and features thereof can be used with other type of engines as well. The terms “engine”, “power unit”, “powertrain” and “powertrain assembly” have been interchangeably used throughout the description.

[0032] Embodiments of the present disclosure disclose an exhaust gas recirculation device for an engine. The exhaust gas recirculation device is designed to mix part of an exhaust gas from an exhaust manifold with fresh air passing through an intake air of the vehicle uniformly. Generally, the existing exhaust gas recirculation device has a configuration of a pipe that has an opening that is defined in the air intake pipe to allow flow of exhaust gases of an exhaust pipe to mix in intake air of an air intake pipe. However, the said devices do not address the problem of non-uniform mixing of the exhaust gases with the intake air when the pressure difference between an intake manifold and an exhaust manifold is low.
[0033] Accordingly, the exhaust gas recirculation device of the present invention comprises a conduit defined with an inlet at one end and a plurality of outlets defined on an inner circumference of the conduit. Further, the inlet is fluidly connected to an exhaust pipe of the engine and the plurality of outlets is fluidly connected to an air intake pipe of the engine. Furthermore, the conduit is configured to receive the exhaust gas and generate a vortex of the exhaust gas to mix with intake air of the air intake pipe. With this configuration, the exhaust gas recirculation device provides a uniform mixture of the exhaust gas and the intake air into the air intake pipe of the engine. Further, this configuration of the exhaust gas recirculation device facilitates equal distribution of the intake mixture into combustion chambers of the engine.
[0034] Reference will now be made to the exemplary embodiments of the disclosure, as illustrated in the accompanying drawings. Wherever possible, same numerals will be used to refer to the same or like parts. Embodiments of the disclosure are described in the following paragraphs with reference to Figures 1 to 8. In Figures 1 to 8, the same element or elements which have same functions are indicated by the same reference signs.
[0035] Referring to Figure 1, which relates to an exhaust gas recirculation device (100) for an engine. The exhaust gas recirculation device (100) is configured to direct a certain volume of the exhaust gases from an exhaust manifold to an intake manifold of the engine. Alternatively, the aspects disclosed in Figure 1 may also be looked at as a volume flow model of the exhaust gas recirculation, where a certain amount of exhaust fluid is flowing through an exhaust gas recirculation mixer [explained in the

forthcoming paragraphs] and an air intake duct. The exhaust gases are transferred from the exhaust manifold to the intake manifold based on fluid pressure difference between the exhaust manifold and the intake manifold of the engine. The exhaust gas recirculation device (100) may also include an exhaust gas recirculation mixer. The exhaust gas recirculation device (100) hereinafter is referred to as “device” or “mixer”.
[0036] The device (100) comprises an exhaust pipe (40) that has one end connected to the exhaust manifold [not shown] of the engine and other end connected to the air intake pipe (50). The device (100) transfers the exhaust gases passing through the exhaust pipe (40) into the air intake pipe (50). The device (100) is configured to allow the exhaust gases of the exhaust pipe (40) to flow into the air intake pipe (50) for mixing with fresh air passing through the air intake pipe (50) in a uniform manner.
[0037] Referring to Figure 2, the device (100) comprises a conduit (10). The conduit (10) has a curved profile that encircles an outer circumference of the air intake pipe (50). However, the same shall not be considered as a limitation as any geometrical form of the conduit may be used based on requirement. In an embodiment, the conduit (10) may have different shapes/profile other than the curved profile, without limiting the scope of the present disclosure. The conduit (10) is defined with a passage that is formed between an inner circumference (10a) and an outer circumference (10b) of the conduit (10). The passage is configured to allow flow of the exhaust gases therethrough.
[0038] Further, the conduit (10) comprises an inlet (20) and a plurality of outlets (30). The inlet (20) is defined at one end of the conduit (10) and the plurality of outlets (30) are defined on the inner circumference (10a) of the conduit (10). The inlet (20) is fluidly connected to the exhaust pipe (40) of the engine and the plurality of outlets (30) is fluidly connected to the air intake pipe (50) of the engine. The inlet (20) is configured to receive the exhaust gases from the exhaust pipe (40) via the exhaust manifold and the plurality of outlets (30) is configured to channel the exhaust gases into the air intake pipe (50). The exhaust gases received in the conduit (10) flows through the curved profile of the conduit (10) i.e. the passage formed between the inner circumference (10a) and the outer circumference (10b) of the conduit (10).

Such flow of the exhaust gas within the passage creates a circular motion of flow of the exhaust gases. As the exhaust gases flow in the circular motion within the passage, the plurality of outlets (30) fluidly connected to the air intake pipe (50) direct the exhaust gases to mix with the intake air. Since the plurality of outlets (30) is positioned on the inner circumference (10a), therethrough the exhaust gases enter into the air intake pipe (50) from multiple directions and create turbulence therein so as to mix with the intake air in a uniform manner, even when the pressure difference between the exhaust manifold and the intake manifold is less.
[0039] In an embodiment, the plurality of outlets (30) may be a plurality of baffles (30a) that is positioned at a pre-defined angle, as shown in Figure 2. The plurality of baffles (30a) is configured to circulate the exhaust gases along the inner circumference (10a) of the air intake pipe (50) in order to increase the turbulence in flow of the exhaust gases for uniform mixing of the exhaust gases with the intake air. The pre-defined angle of the baffle ranges from 25 degree to 60 degree.
[0040] In an embodiment, the plurality of baffles (30a) may be defined equidistant with each other. Such a configuration aids increasing the concentration of the mixture of the exhaust gases mixing with the intake air. This configuration reduces the occurrence of rich concentration of the mixture at one place and lean concentration of the mixture at other places within the air intake pipe (50).
[0041] In an embodiment, volume of the passage for flow of exhaust gas defined between the inner circumference (10a) and the outer circumference (10b) of the conduit (10) may be reduced along an outer circumference of the air intake pipe (50). For example, the volume of the passage for flow of exhaust gas at its first end is larger than volume of the passage for flow of exhaust gas at its other ends. This configuration of the conduit (10) facilitates maintaining velocity of the exhaust gases in the conduit (10).
[0042] Referring to Figure 4, the air intake pipe (50) for the engine is illustrated. The conduit (10) is defined at a portion of the air intake pipe (50). The inlet (20) of the conduit (10) is positioned on an outer circumference of the air intake pipe (50) that is fluidly connectable to the exhaust pipe (40). The plurality of outlets (30) is protruding inside the air intake pipe (50) that is disposed in the air intake pipe (50). In an

embodiment, the device (100) comprises at least one insert (60), as shown in Figures 4 and 5. The insert (60) has a plurality of cutouts (70) that are defined equidistantly to each other, as shown in Figure 5. The plurality of cutouts (70) defined in the insert (60) may be equal to the plurality of outlets (30). The insert (60) is configured to be positioned inside the air intake pipe (50) at the inner circumference (10a) of the conduit (10) such that the plurality of cut-outs (70) matches with the plurality of outlets (30). The exhaust gases pass through the plurality of cutouts (70) to mix with the intake air passing through the air intake pipe (50).
[0043] The device (100) comprises an actuator (80) that is connected to an engine management system (not shown in figures). The actuator (80) is actuated by the engine management system based on engine operating conditions. The engine operating conditions may relate to an engine speed and pressure difference between the exhaust manifold and the intake manifold etc., The engine management system determines the engine operating conditions and accordingly operates the actuator (80).
[0044] Figures 6 and 7 showcase the volume of intake manifold (90) connectable to a head [not shown] of the engine. Further, an actuator (80) is mounted on the exhaust pipe (40) which is in turn connectable to the conduit (10). The actuator (80) is connected to a valve (not shown in figures) and the actuator (80) operates the valve to an open position and a closed position within the exhaust pipe (40) to allow passage of exhaust gases. The exhaust pipe (40) is fluidly connected to the conduit (10) that is further fluidly connected to the air intake pipe (50). The exhaust gases of the exhaust pipe (40) pass through the conduit (10) to mix with the fresh air passing through the air intake pipe (50) in the uniform manner. Accordingly, the mixture of the exhaust gases and the fresh air are equally distributed in combustion chambers of the engine.
[0045] Several tests have been carried out to evaluate performance of the device (100). One such simulation test result is disclosed along with graphs based on distribution of the mixture of the exhaust gases and the intake air into each cylinder of the engine. During the test, parameters such as total gas flow rate (Kg/s), engine speed (rpm), and EGR flow rate (Kg/s) [EGR stands for Exhaust Gas Recirculation] were considered.

[0046] Referring to Figure 8, the graphs illustrate two modes [mode 1 and mode 2] of operation of the engine. In mode 1, the graph indicates the performance of the device (100) when the BMEP of the engine is 18.7 bar and engine speed is 1430 rpm. In mode 2, the graph indicates the performance of the device (100) when the BMEP of the engine is 6.4 bar and engine speed is 1030 rpm. The graphs show that distribution of the mixture of the exhaust gases and the intake air into the cylinders of the engine are equal.
[0047] In accordance with the present disclosure, the exhaust gas recirculation device (100), as explained in the above paragraphs, is capable to provide uniform mixture of the exhaust gases and the intake air to the combustion chambers of the engine, even when the pressure difference between the exhaust manifold and the intake manifold is small. Further, the exhaust gas recirculation device is adapted to improve overall NVH performance of the vehicle.
[0048] The various embodiments of the present disclosure have been described above with reference to the accompanying drawings. The present disclosure is not limited to the illustrated embodiments; rather, these embodiments are intended to fully and completely disclose the subject matter of the disclosure to those skilled in this art. In the drawings, like numbers refer to like elements throughout. The thicknesses and dimensions of some components may be exaggerated for clarity.
[0049] Herein, the terms “attached”, “connected”, “interconnected”, “contacting”, “mounted”, “coupled” and the like can mean either direct or indirect attachment or contact between elements, unless stated otherwise.
[0050] Well-known functions or constructions may not be described in detail for brevity and/or clarity. As used herein the expression “and/or” includes any and all combinations of one or more of the associated listed items.
[0051] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “includes” and/or “including” when used in this

specification, specify the presence of stated features, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, operations, elements, components, and/or groups thereof.
[0052] While considerable emphasis has been placed herein on the particular features of this disclosure, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other modifications in the nature of the disclosure or the preferred embodiments will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.
[0053] LIST OF REFERENCE NUMERALS

Sr. No. Description
100 Exhaust gas recirculation device
10 Conduit
10a Inner circumference
10b Outer circumference
20 Inlet
30 Plurality of outlets
30a Plurality of baffles
40 Exhaust pipe
50 Air intake pipe
60 Insert
70 Cutouts
80 Actuator

90 Intake manifold

[0054] EQUIVALENTS:
The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
Any discussion of documents, acts, materials, devices, articles and the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.
The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.

We claim:
1. An exhaust gas recirculation device (100) for an engine, the device (100)
comprising:
a conduit (10) defined with an inlet (20) at one end and a plurality of outlets (30) defined on an inner circumference (10a) of the conduit (10), wherein the inlet (20) is fluidly connected to an exhaust pipe (40) of the engine and, the plurality of outlets (30) is fluidly connected to at least one insert (60), wherein the insert is disposed within an air intake pipe (50) of the engine, and
wherein the conduit (10) is configured to receive exhaust gas and generate a vortex of the exhaust gas to mix with intake air in the air intake pipe (50).
2. The device (100) as claimed in claim 1, wherein the plurality of outlets (30) are plurality of baffles (30a).
3. The device (100) as claimed in claim 2, wherein the plurality of baffles (30a) are positioned at a pre-defined angle to circulate the exhaust gases along an inner circumference of the air intake pipe (50).
4. The device (100) as claimed in claim 2, wherein the plurality of baffles (30a) are equidistant from each other.
5. The device (100) as claimed in claim 1, comprising an actuator (80) connectable to a valve, wherein the actuator (80) operates the valve for opening and closing the exhaust pipe (40).

6. The device (100) as claimed in claim 1, wherein the conduit (10) has an outer circumference (10b) and the inner circumference (10a), wherein a passage is defined between the inner circumference (10a) and the outer circumference (10b).
7. The device (100) as claimed in claim 6, wherein volume of the passage is reduced along an outer circumference of the air intake pipe (50) to maintain velocity of the exhaust gases in the conduit (10).

8. The device (100) as claimed in claim 1, wherein the insert (60) is defined with plurality of cut-outs (70), wherein the plurality of cut-outs (70) matches with the plurality of outlets (30).
9. The device (100) as claimed in claim 8, wherein the insert (60) is configured to be positioned at the inner circumference (10a) of the conduit (10).