WO2009112888A1

WO2009112888A1 - Ejection exhaust system

Info

Publication number: WO2009112888A1
Application number: PCT/IB2008/050915
Authority: WO
Inventors: Emin Gadzhiyev
Original assignee: Emin Gadzhiyev
Priority date: 2008-03-13
Filing date: 2008-03-13
Publication date: 2009-09-17
Also published as: EP2391806A1

Abstract

The present invention relates to an exhaust system entraining an external air by the exhaust gases through an ejector effect which the exhaust gases exert on the air in the outlet duct (30), and for exhausting the burned gas from a muffler tail pipe (40), using discharging path of a vehicle, to improve fuel efficiency and torque of the vehicle. The device is provided with an air intake for admitting an external air into the exhaust system and entraining an external air together with the exhaust gases. The air intake includes an air baffle element (60), which leads the air into an essentially central area in an outlet duct (30), in which the exhaust gases are led out, in such a way that the air is entrained out by the exhaust gases through an ejector effect which the exhaust gases exert on the air in the outlet duct (30).

Description

DESCRIPTION

EJECTION EXHAUST SYSTEM Technical Field

The present invention relates to device for mixing and exhausting the burned gas utilized in an internal combustion engine with an external air, and more particularly, to an exhaust gas and air- mixing device operating with the airflow created by an ejector type mixer.

Background Art

As widely known, a vehicle using an internal combustion engine obtains a driving power through the four-stroke cycle consisting of the intake stroke, the compression stroke, the combustion stroke, and the exhaust stroke.

In view of air stream during the strokes (the intake stroke and the exhaust stroke) of the engine, air is introduced into the internal combustion engine without a relative large resistance when passing through an air cleaner, a throttle valve, and the like during the suction stroke.

However, during the exhaust stroke, since the burned gas is exhausted to the tail pipe through an air cleaner using a catalyzer and a muffler, a relative large resistance occurs in a stream of the burned gas.

During the exhaust from cylinders of the internal combustion engine to the tail pipe, in an exhaust manifold, a phenomenon that an intake valve and an exhaust valve are instantly opened at a same time during the four strokes of the internal combustion engine, that is, there is a moment when a so called valve overlap occurs. During this process, there occurs a phenomenon that the exhaust gas is re-introduced into the cylinders so that the exhaust manifold is instantly vacuumized, resulting in creating a primary exhaust pressure to disturb the exhaust of the exhaust gas.

Moreover, in a three-way catalytic converter used as the air cleaner, the flow rate of the exhaust gas is so remarkably reduced that a secondary exhaust pressure is generated when the exhaust gas passes through fine holes of a HoneyCom style exhaust gas cleaner, and the exhaust gas is introduced into the muffler to generate a third exhaust pressure when exhaust gas passes through partitions for partitioning the muffler into multiple spaces so that sound is absorbed by the muffler.

Since the exhaust gas is exhausted at a pressure of 3 to 5 kg/cm and at about 600 degrees centigrade during this exhaust process, the muffler is essential. The muffler is designed to have fifteen to twenty times the volume of an engine. Since the exhaust gas cannot be exhausted through the muffler due to air resistance, the torque of the engine is reduced by 5 to 10 percent.

Thus, it can be understood that the torque and the fuel efficiency of the engine can be improved simply by exhausting the exhaust gas more effectively.

In order to exhaust the exhaust gas more effectively, various approaches have been proposed.

Korean Patent Laid-Open No. 2000-56951 proposes an exhaust vessel of a vehicle using an air stream, generated when the vehicle is traveling. In the exhaust vessel, a streamline body of the exhaust vessel is coupled with the tail pipe such that there is formed a lower pressure region by air stream rapidly passing through the streamline body and the exhaust gas is rapidly suctioned into the exhaust vessel to help the exhaust of the exhaust gas due to the lower pressure.

However, the conventional exhaust vessel of a vehicle is too large and complex to install the streamline body on the vehicle. Moreover, since it cannot create the air stream when a vehicle is stopped or traveling at a low speed, narrow exhaust passages instead disturbs the exhaust of the exhaust gas. Thus, it is difficult to put the conventional exhaust vessel to practical use. According to a tail pipe of a main silencer having a vortex generator disclosed in Korean Patent Laid-Open No. 1998-75223, vortex blades are provided in the mid section of the tail pipe to be rotated by the exhaust gas such that the vortex blades are rotated by the exhaust gas to generate the vortex and exhaust the exhaust gas. However, it is difficult to actually use this structure because this structure instead causes resistance and disturbs the stream of the exhaust gas.

According to an exhaust gas-discharging device of a vehicle disclosed in Korean registered Utility Model No. 99434, a pipe is provided to be attached to an end of a tail pipe by screws and a plurality of blades for generating vortex are formed in the inner circumference of the pipe in the radial direction such that the exhaust gas is converted into vortex to improve exhaust efficiency. However, the structure of forming the exhaust gas into a vortex is not sufficient to rapidly and smoothly exhaust the exhaust gas, its effect being insignificant and only partially helping to form the exhaust vortex in addition to the natural exhaust due to the exhaust pressure, and thus the efficiency is very low.

Moreover, according to an exhaust gas-discharging device using vortex generating duct is provided in a front pipe of a muffler installed on the exhaust gas path and includes a vane for introducing external air and forming a vortex, and a sub-duct includes a valve of which an opening degree is adjusted in proportion to an opening degree of a throttle valve.

However, since the duct through which the external air is introduced is installed in the front pipe of the muffler for eliminating exhaust noise, the exhaust noise escapes to the duct so that noise is louder. The valve is opened widely when accelerating so that the exhaust noise is louder. Moreover, since the exhaust gas is exhausted to the sub-> duct having lower air resistance than that of the inside of the muffler, the introduced air meets resistance so that it is difficult to put the exhaust gas-discharging device to practical use.

According to the conventional exhaust gas-discharging device, since the external air is introduced into an inlet of the muffler, air resistance remains in the muffler this effect being not useful to rapidly exhaust the exhaust gas. Since an external air adjusting damper operated in association with the throttle valve of the engine is provided, its structure and its equipment for manufacturing the same are complex. Since the external air is introduced and passes through the muffler, foreign matter contained in the external air such as dust, sand, or the like is accumulated in the muffler, and performance of the muffler is deteriorated.

The present invention is proposed to improve the devices disclosed above.

DISCLOSURE OF INVENTION Technical Problem

Therefore, the present invention has been made in view of the above problems and of improving the related devices filed by this applicant of the present invention and their efficiency, and it is an object of the present invention to provide an exhaust gas and external air mixing device of a vehicle in which exhaust gas exhausted through a tail pipe of the muffler generates a jet stream, which leads the air into the ejector, in which the exhaust gases are led out, in such a way that the air is entrained out by the exhaust gases through an ejector effect which the exhaust gases exert on the air.

It is still another object of the present invention to provide ejector mixing of the exhaust gases and the external air is more effective than eductor mixing so the reduction of the harmful components considerably increases and the exhaust gases have no way directly enter the atmosphere.

It is still another object of the present invention to provide an exhaust gas and external air mixing device of a vehicle operating with the airflow created by an ejector type mixer for significantly reducing concentration of CO₂ and HC in exhaust after devise. It is still another object of the present invention to provide an exhaust gas and external air mixing device of a vehicle operating with the airflow created by an ejector type mixer for significantly increasing volume of O₂ in exhaust after devise.

It is still another object of the present invention to provide volume of the coming external air considerably more than this one inside the known devices because there are no obstacles at the inlet and, moreover, the exhaust gases going out at high speed involve the air flow.

It is another object of the present invention to provide the device which works effectively at different operating modes of the internal combustion engine, even at the idling mode and at the minimal availability of the exhaust gases.

It is still another object of the present invention to provide an exhaust gas and external air mixing device of a vehicle operating with the airflow created by an ejector type mixer for significantly reducing an exhaust noise and temperature.

It is another object of the present invention to provide an ejection exhaust system of a vehicle for rapidly exhausting exhaust gas and discharging re-introduced exhaust gas to the mid section of a tail pipe so that the valve overlap, which causes the exhaust gas to be reintroduced into an engine, is prevented and torque of the engine is increased.

It is still another object of the present invention to provide an ejection exhaust system of a vehicle for significantly reducing re-introduction of exhaust gas to preventing burned matter such as carbon from being accumulated therein so that a lifespan of an engine is prolonged and various components of the exhaust system such as a high price exhaust gas purifier can be maintained clean.

Technical Solution

In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of an ejection exhaust system of a vehicle including: first substantially decrease the concentration of CO ₂ and HC in exhaust after devise and secondly an exhaust gas-discharging device of a vehicle rapidly exhausting exhaust gas that the valve overlap is prevented and torque of the engine is increased.

Advantageous Effects

As described above, according to the ejection exhaust system of the present invention, since the exhaust speed of the exhaust gas, discharged through a tail pipe of a muffler through which the exhaust gas is discharged, is increased together with the external air being rapidly introduced such that the exhaust gas is rapidly exhausted so that the vehicle is effectively accelerated and the hill climbing ability of the vehicle is also increased.

Since the exhaust gas is rapidly is exhausted and the introduced external air is circulated at the mid section of the tail pipe and discharged out, the valve overlap, which causes the exhaust gas to be reintroduced into an engine, is prevented and torque of the engine is increased. The structure is simple and strong, the endurance thereof is remarkably increased and it is capable of being applied to a vehicle without a structural change of the conventional muffler so that the compatibility is excellent. In addition, it prevents the exhaust gas and pollutants such as carbon from being reintroduced so that a lifespan of the engine is prolonged and various components such as an exhaust gas purifier of the exhaust system are maintained clean and their lifespan is also prolonged. Brief Description of the Drawing

The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawing, in which:

Fig. 1 is a sectional view illustrating an ejection exhaust system of a vehicle as a conventional art filed by this inventor of this application.

Detailed Description

FIG. 1 shows an alternative embodiment of the arrangement according to the invention, in which the tailpipe 50 connected into the chamber 20. In this way a more compact chamber construction is obtained. The air baffle element 60 extends through the chamber 20 and, as previously, into the tailpipe 50. In other words, the air baffle element 60 in this case projects right through the chamber

20.

In the present application, the use of terms such as "including" is open-ended and is intended to have the same meaning as terms such as "comprising" and not preclude the presence of other structure, material, or acts. Similarly, though the use of terms such as "can" or "may" is intended to be open-ended and to reflect that structure, material, or acts are not necessary, the failure to use such terms is not intended to reflect that structure, material, or acts are essential. To the extent that structure, material, or acts are presently considered to be essential, they are identified as such.

It will be appreciated that a number of variants of the invention will be obvious to a person skilled in the art without departing from the scope of the invention, as defined in the claims attached, based on the description and the drawing.

For example, the air baffle element may obviously be of some design shape other than that described above. The chamber 20 is preferably, but need not necessarily be arranged above some heavily heat-affected component. The inlet to the air baffle element is the part which should be arranged in proximity to such a component.

Best Mode for Carrying out the Invention

Hereinafter, an ejection exhaust system of a vehicle according to the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing.

Fig. 1 shows an ejection exhaust system of vehicle according to a basic preferred embodiment of the present invention.

Claims

1.An ejection exhaust system comprising: an air intake for admitting external air into the exhaust system and entraining the air together with the exhaust gases, the air intake comprising an air baffle element adapted to lead external air into an essentially central area in an outlet duct, the outlet duct being arranged such that exhaust gases from the engine are adapted to entrain admitted external air through an ejector effect which the exhaust gases exert on the admitted air in the outlet duct.

2. The ejection exhaust system as claimed in claim 1, wherein the air baffle element forms an air baffle duct, a cross section of the air baffle duct diminishing toward a point where it opens into the outlet duct.

3. The ejection exhaust system as claimed in claim 2, wherein the air baffle element extends in the outlet duct, the outlet duct being at least in part defined by a pipe wall, the pipe wall having an inner periphery extending at a constant distance from an outer periphery of the air baffle element in an area where the pipe wall and the air baffle element overlap one another.

4. The ejection exhaust system as claimed in claim 3, wherein the exhaust system comprises a chamber into which the exhaust gases are led via an exhaust pipe connected to the chamber, the air baffle element projecting into the chamber in one direction opening into the outlet duct, and the outlet duct leading out of the chamber in an opposite direction.

5. The working machine as claimed in claim 4, comprising a surface for directing the exhaust gases along an annular gap in the part of the outlet duct where the air baffle element introduces the admitted external air.

6. The working machine as claimed in claim 5, wherein the surface comprises an outer periphery of the air baffle element.

7. The ejection exhaust system as claimed in claim 6, wherein the air baffle element comprises a pipe which extends into and is essentially coaxially with the outlet duct.

8. The ejection exhaust system as claimed in claim 7, comprising a surface for directing the exhaust gases along an annular gap in the part of the outlet duct where the air baffle element introduces the admitted external air.

9. The ejection exhaust system as claimed in claim 8, wherein the surface comprises an outer periphery of the air baffle element.

10. The ejection exhaust system as claimed in claim 9, wherein the air baffle element forms an air baffle duct, a cross section of the air baffle duct diminishing toward a point where it opens into the outlet duct.

11. The working machine as claimed in claim 10, comprising a surface for directing the exhaust gases along an annular gap in the part of the outlet duct where the air baffle element introduces the admitted external air.

12. The ejection exhaust system as claimed in claim 11, wherein the surface comprises an outer periphery of the air baffle element.

13. The ejection exhaust system as claimed in claim 12, wherein the air baffle element extends in the outlet duct, the outlet duct being at least in part defined by a pipe wall, the pipe wall having an inner periphery extending at a constant distance from an outer periphery of the air baffle element in an area where the pipe wall and the air baffle element overlap one another.

14. The ejection exhaust system as claimed in claim 13, wherein the exhaust system comprises a chamber into which the exhaust gases are led via an exhaust pipe connected the outlet duct, and the outlet duct leading out of the chamber in an opposite direction.