CN107489565B - Exhaust gas recirculation system and engine with same - Google Patents
Exhaust gas recirculation system and engine with same Download PDFInfo
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- CN107489565B CN107489565B CN201611208682.0A CN201611208682A CN107489565B CN 107489565 B CN107489565 B CN 107489565B CN 201611208682 A CN201611208682 A CN 201611208682A CN 107489565 B CN107489565 B CN 107489565B
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Abstract
The invention discloses an exhaust gas recirculation system which comprises a cooler, wherein a cooling channel of the cooler is provided with an exhaust gas inlet used for connecting an exhaust manifold and a supercharger aftertreatment device, a first exhaust gas outlet used for connecting an intake manifold and a second exhaust gas outlet used for connecting a supercharger, the second exhaust gas outlet is positioned at the downstream of the first exhaust gas outlet in the flowing direction, and a variable flow channel switch valve is arranged between the first exhaust gas outlet and the second exhaust gas outlet. The invention has the advantages of fewer parts, small occupied space, simple assembly, space saving in the engine, easier arrangement of a cooler on the engine and low cost; in addition, the second exhaust outlet connected with the supercharger has a longer flowing distance compared with the first exhaust outlet, so that larger heat dissipation power can be realized, and the flowing of the exhaust gas in the cooler is prolonged to increase the heat dissipation power. The invention also discloses an engine comprising the exhaust gas recirculation system.
Description
Technical Field
The invention relates to the technical field of engine design, in particular to an exhaust gas recirculation system. Furthermore, the invention relates to an engine comprising the above exhaust gas recirculation system.
Background
As emission regulations and fuel consumption requirements become more stringent, the emission regulations become the leading factor leading to the technological progress of diesel engines. The control of harmful substances in the exhaust gases of engines is becoming increasingly important. An EGR (Exhaust gas recirculation) technology is adopted in the engine, so that the combustion temperature can be effectively controlled, and the emission of nitrogen oxides can be reduced.
In the prior art, two coolers are generally adopted to cool exhaust gas in high-pressure exhaust gas recirculation and low-pressure exhaust gas recirculation respectively, the exhaust gas is led in from one side of an EGR cooler and led out from the other side in different stages of use of an engine, a cooling medium and the exhaust gas flow in the reverse direction, the cooling structure is single, the function is single, and in addition, because the number of parts of the engine is more, the arrangement difficulty degree of the engine can be increased by arranging the two coolers.
In summary, how to provide an exhaust gas recirculation system with simple arrangement and low cost is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides an exhaust gas recirculation system, which has a simple structure, is convenient to arrange, and has a low cost.
It is another object of the present invention to provide an engine including the above exhaust gas recirculation system.
In order to achieve the above purpose, the invention provides the following technical scheme:
the utility model provides an exhaust gas recirculation system, includes the cooler, be equipped with the exhaust gas inlet that is used for connecting exhaust manifold and booster aftertreatment device on the cooling channel of cooler, be used for connecting intake manifold's first exhaust outlet and be used for connecting the second exhaust outlet of booster, second exhaust outlet is located the flow direction low reaches of first exhaust outlet, and is provided with the change runner ooff valve between the two.
Preferably, a first throttle valve is provided on a connection pipe between the cooler and the intake manifold or between the cooler and the exhaust manifold; and a second throttle valve is arranged on a connecting pipeline between the cooler and the supercharger or between the cooler and the supercharger aftertreatment device.
Preferably, the variable flow path switch valve, the first throttle valve and the second throttle valve are all connected with a control device, and the control device is further connected with an engine speed measuring device and used for adjusting the opening and closing of the variable flow path switch valve, the first throttle valve and the second throttle valve according to the rotating speed of the engine.
Preferably, the exhaust gas cooling device further comprises an exhaust gas bypass passage arranged in parallel with the cooler, and a bypass valve is arranged on the exhaust gas bypass passage.
Preferably, when the rotation speed of the engine is low, the control device controls the first throttle valve and the bypass valve to be opened, and the second throttle valve and the variable flow path switching valve to be closed;
and/or when the rotating speed of the engine is medium speed, the control device controls the first throttle valve to be opened, the variable flow channel switch valve is communicated with the waste gas inlet and the first waste gas outlet, and the second throttle valve and the bypass valve are closed;
and/or when the rotation speed of the engine is high, the control device controls the second throttle valve to be opened, the variable flow path switching valve is communicated with the exhaust gas inlet and the second exhaust gas outlet, and the first throttle valve and the bypass valve are closed.
Preferably, the cooling channel of the cooler is a bent channel, the exhaust gas inlet and the second exhaust gas outlet are respectively arranged at two ends of the cooling channel, and the variable flow path switching valve is arranged at the bent part of the cooling channel.
Preferably, the cooling channel of the cooler is a U-shaped channel.
Preferably, a coolant passage for exchanging heat with the exhaust gas passage in the cooler is connected to the cylinder.
Preferably, the variable flow passage switch valve is a butterfly valve driven by a motor, or a lift valve controlled by a vacuum regulator, or a rotary valve driven by a connecting rod.
An engine comprising an exhaust gas recirculation system as claimed in any preceding claim.
In the exhaust gas recirculation system provided by the invention, the cooler is provided with the two exhaust gas outlets, and the variable flow channel switch valve is additionally arranged between the two exhaust gas outlets, so that the high-pressure exhaust gas recirculation and the low-pressure exhaust gas recirculation can share one cooler, the number of parts is less, the occupied space is small, the assembly is simple, the space in the engine is saved, and the arrangement of one cooler on the engine is easier and the cost is low; in addition, the second exhaust outlet connected with the supercharger has a longer flowing distance compared with the first exhaust outlet, so that larger heat dissipation power can be realized, and the flowing of the exhaust gas in the cooler is prolonged to increase the heat dissipation power.
The invention also provides an engine comprising the exhaust gas recirculation system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of an exhaust gas recirculation system according to the present invention;
fig. 2 is a schematic diagram of a cooler in an exhaust gas recirculation system according to the present invention.
In FIGS. 1-2:
1 is a cooler, 11 is a first exhaust gas outlet, 12 is a second exhaust gas outlet, 13 is an exhaust gas inlet, 14 is a variable flow path switching valve, 2 is an exhaust gas bypass passage, 21 is a bypass valve, 31 is a first throttle valve, and 32 is a second throttle valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide an exhaust gas recirculation system which has simple structure, convenient arrangement and lower cost.
Another core of the present invention is to provide an engine comprising the above exhaust gas recirculation system.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an exhaust gas recirculation system according to the present invention; fig. 2 is a schematic diagram of a cooler in an exhaust gas recirculation system according to the present invention.
The invention provides an exhaust gas recirculation system which comprises a cooler 1, wherein the cooler 1 is provided with a cooling channel and a refrigerant passage or a refrigerant element for exchanging heat with the cooling channel. The cooling channel is used for connecting with the cylinder body to obtain the exhaust gas and cool the exhaust gas. The cooling channel is provided with an exhaust gas inlet 13, a first exhaust gas outlet 11 and a second exhaust gas outlet 12. The exhaust gas inlet 13 is used for connecting an exhaust manifold and a supercharger aftertreatment device, the first exhaust gas outlet 11 is used for connecting an intake manifold, and the second exhaust gas outlet 12 is used for connecting a supercharger or an intercooler connected with the supercharger. In the upward direction of the exhaust gas flow of the cooling passage, the second exhaust gas outlet 12 is located downstream in the flow direction of the first exhaust gas outlet 11, and a variable flow path switching valve 14 is provided therebetween. The function of the variable flow path switching valve 14 is to control the flow of exhaust gas out of the cooler through the first exhaust gas outlet 11 and out of the cooler through the second exhaust gas outlet 12. That is, after entering from the exhaust gas inlet 13, the exhaust gas will flow to the position of the first exhaust gas outlet 11, and the flow direction of the exhaust gas is controlled by the variable flow path switching valve 14.
The intake manifold and the exhaust manifold are both an intake manifold and an exhaust manifold of the engine block, and the supercharger is connected to the exhaust manifold. When the system is in use, in a first use state, waste gas enters a cylinder from an exhaust manifold, sequentially passes through an air inlet pipeline of a cooler, the cooler, an air outlet pipeline of the cooler and the air inlet manifold; in the second use state, the waste gas passes through the exhaust manifold and the supercharger aftertreatment device, sequentially passes through the air inlet pipeline of the cooler, the air outlet pipeline of the cooler and the cooler, the supercharger and the intercooler, returns to the air inlet manifold and finally enters the cylinder.
In the exhaust gas recirculation system provided by the invention, the cooler 1 is provided with two exhaust gas outlets, and the variable flow channel switch valve 14 is additionally arranged between the two exhaust gas outlets, so that the high-pressure exhaust gas recirculation and the low-pressure exhaust gas recirculation can share one cooler, the number of parts is less, the occupied space is small, the assembly is simple, the space in the engine is saved, and the arrangement of one cooler on the engine is easier and the cost is low; in addition, the second exhaust gas outlet 12 connected to the supercharger is made to flow for a longer distance than the first exhaust gas outlet 11, so that a larger heat dissipation capacity can be achieved, and the flow of exhaust gas in the EGR cooler is prolonged to increase the heat dissipation capacity.
Alternatively, in addition to the above-mentioned embodiments, the variable flow path switching valve 14 may be capable of selectively communicating with the first exhaust gas outlet 11 or the second exhaust gas outlet 12, and may also be capable of controlling the distance flow rate of the passage of the first exhaust gas outlet 11 or the second exhaust gas outlet 12, for example, a flow rate control device may be added to the variable flow path switching valve 14, and the flow rate in the passage may be controlled to change the cooling effect of the device on the exhaust gas.
In addition to the above embodiments, the cooler 1 is provided with the first throttle valve 31 on the connection pipe with the intake manifold or with the exhaust manifold; a second throttle 32 is provided on a connection line between the cooler 1 and the supercharger or the supercharger aftertreatment device.
It should be noted that the connecting pipeline between the first exhaust gas outlet 11 of the cooler 1 and the intake manifold is an outlet pipeline of the cooler, the connecting pipeline between the exhaust gas inlet 13 of the cooler 1 and the exhaust manifold is an inlet pipeline of the cooler, and both the outlet pipeline and the inlet pipeline may be provided with a first throttle valve 31, so as to control the gas flow on the outlet pipeline and the inlet pipeline.
Correspondingly, the pipeline that the first exhaust gas outlet 11 of the cooler 1 is connected with the supercharger aftertreatment device is an air inlet pipeline, the pipeline that the second exhaust gas outlet 12 of the cooler 1 is connected with the supercharger is an air outlet pipeline, and the second throttle valves 32 can be arranged on the air outlet pipeline and the air inlet pipeline, so that the air flow on the air outlet pipeline and the air inlet pipeline can be controlled.
Alternatively, the above setting is not exclusive, as long as the control of the flow rate in the loop can be realized.
On the basis of the above embodiment, the variable flow path switching valve 14, the first throttle valve 31 and the second throttle valve 32 are all connected with a control device, and the control device is also connected with an engine speed measuring device, and is used for correspondingly adjusting the opening and closing of the variable flow path switching valve 14, the first throttle valve 31 and the second throttle valve 32 according to the rotating speed of the engine.
It should be noted that the control fluency of the system can be improved by automatically controlling the valve body through the control device.
In addition to any of the above embodiments, the exhaust gas bypass passage 2 is provided in parallel with the cooler 1, and the bypass valve 21 is provided in the exhaust gas bypass passage 2.
Referring to fig. 1, in fig. 1, the waste gas bypass passage 2 is connected in parallel with the cooler, and the bypass valve 21 is disposed on the waste gas bypass passage 2. In the idling state of the vehicle, the exhaust gas passes through the cooler air inlet pipeline, the exhaust gas bypass passage 2, the bypass valve, the air outlet pipeline and the air inlet manifold in sequence from the exhaust manifold, and then enters the cylinder. In the above process, the waste gate passage 2 short-circuits the cooler so that the exhaust gas enters only the waste gate passage 2 and finally returns to the intake manifold.
In any of the embodiments described above, the control device controls the cooler in actual use in accordance with the engine speed.
When the engine speed is low, the control device controls the first throttle valve 31 and the bypass valve 21 to open, and the second throttle valve 32 and the variable flow path switching valve 14 to close. Wherein, the low speed can be 750-.
And/or when the engine speed is at a medium speed, the control device controls the first throttle valve 31 to be opened, the variable flow path switching valve 14 to communicate the exhaust gas inlet 13 with the first exhaust gas outlet 11, and the second throttle valve 32 and the bypass valve 21 to be closed. Wherein, the medium speed can be 1000-.
And/or when the engine speed is high, the control device controls the second throttle valve 32 to be opened, the variable flow path switching valve 14 to communicate the exhaust gas inlet 13 and the second exhaust gas outlet 12, and the first throttle valve 31 and the bypass valve 21 to be closed. Wherein, the high speed can be specifically 2000-.
In any of the above embodiments, the cooling passage of the cooler 1 is a bent passage, the exhaust gas inlet 13 and the second exhaust gas outlet 12 are respectively provided at both ends of the cooling passage, and the variable flow path switching valve 14 is provided at a bent portion of the cooling passage.
In order to increase the effect of the exhaust gas introduced through the second exhaust gas inlet 12, the exhaust gas on the cooling passage connected to the second exhaust gas outlet 12 may be sufficiently cooled and treated. The bent cooling channel can increase the length of the cooling passage, so that the cooling passage and the refrigerant can fully react.
On the basis of the above-described embodiment, the cooling channel of the cooler 1 is a U-shaped channel. The specific arrangement may refer to the U-shaped channel of fig. 2.
Optionally, the bending channel may also be an M-shaped channel, a Z-shaped channel, or a turning channel with other shapes.
On the basis of any of the above embodiments, the coolant passage for exchanging heat with the exhaust gas passage in the cooler 1 is connected to the cylinder.
Alternatively, the variable flow path switching valve 14 is a motor driven butterfly valve, or a vacuum regulator controlled poppet valve, or a link driven rotary valve.
In addition to the exhaust gas recirculation system provided in each of the above embodiments, the present invention also provides an engine including the exhaust gas recirculation system disclosed in the above embodiments, and the structure of other parts of the engine is referred to in the prior art and will not be described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The exhaust gas recirculation system and the engine with the same provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. An exhaust gas recirculation system comprises a cooler (1), and is characterized in that an exhaust gas inlet (13) used for connecting an exhaust manifold and a supercharger aftertreatment device, a first exhaust gas outlet (11) used for connecting an intake manifold and a second exhaust gas outlet (12) used for connecting a supercharger are arranged on a cooling channel of the cooler (1), the supercharger is connected with the intake manifold through an intercooler, the second exhaust gas outlet (12) is positioned at the downstream of the first exhaust gas outlet (11) in the flowing direction, and a variable flow channel switch valve (14) is arranged between the first exhaust gas outlet and the second exhaust gas outlet;
the cooling channel of the cooler (1) is a bent channel, the waste gas inlet (13) and the second waste gas outlet (12) are respectively arranged at two ends of the cooling channel, and the variable flow channel switch valve (14) is arranged at a bent part of the cooling channel.
2. An exhaust gas recirculation system according to claim 1, characterized in that a first throttle valve (31) is provided on a connection pipe of the cooler (1) to the intake manifold or to the exhaust manifold; and a second throttle valve (32) is arranged on a connecting pipeline between the cooler (1) and the supercharger or between the cooler and the supercharger aftertreatment device.
3. The exhaust gas recirculation system according to claim 2, characterized in that the variable flow path switching valve (14), the first throttle valve (31) and the second throttle valve (32) are each connected to a control device, which is also connected to an engine speed measuring device for adjusting the opening and closing of the variable flow path switching valve (14), the first throttle valve (31) and the second throttle valve (32) according to the rotational speed of the engine.
4. An exhaust gas recirculation system according to claim 3, further comprising an exhaust gas bypass passage (2) arranged in parallel with the cooler (1), a bypass valve (21) being provided on the exhaust gas bypass passage (2).
5. The exhaust gas recirculation system according to claim 4, characterized in that when the rotational speed of the engine is low, the control device controls the first throttle valve (31), the bypass valve (21) to be opened, and the second throttle valve (32), the variable flow path switching valve (14) to be closed;
and/or when the rotational speed of the engine is medium, the control device controls the first throttle valve (31) to be opened, the variable flow path switching valve (14) communicates the exhaust gas inlet (13) and the first exhaust gas outlet (11), and the second throttle valve (32) and the bypass valve (21) are closed;
and/or when the rotation speed of the engine is high, the control device controls the second throttle valve (32) to be opened, the variable flow path switching valve (14) is communicated with the exhaust gas inlet (13) and the second exhaust gas outlet (12), and the first throttle valve (31) and the bypass valve (21) are closed.
6. An exhaust gas recirculation system according to any of claims 1-5, characterized in that the cooling channel of the cooler (1) is a U-shaped channel.
7. An exhaust gas recirculation system according to claim 6, characterized in that a coolant passage for heat exchange with the exhaust gas passage in the cooler (1) is connected to the cylinder.
8. An exhaust gas recirculation system according to claim 6, characterized in that the variable flow path switching valve (14) is a motor driven butterfly valve, or a vacuum regulator controlled poppet valve, or a link driven rotary valve.
9. An engine comprising an exhaust gas recirculation system, wherein the exhaust gas recirculation system is as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611208682.0A CN107489565B (en) | 2016-12-23 | 2016-12-23 | Exhaust gas recirculation system and engine with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611208682.0A CN107489565B (en) | 2016-12-23 | 2016-12-23 | Exhaust gas recirculation system and engine with same |
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| Publication Number | Publication Date |
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| CN107489565A CN107489565A (en) | 2017-12-19 |
| CN107489565B true CN107489565B (en) | 2020-06-16 |
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| CN111120155A (en) * | 2019-12-03 | 2020-05-08 | 一汽解放汽车有限公司 | EGR cooling device and engine |
| CN112392630B (en) * | 2020-11-18 | 2021-11-23 | 中国煤炭科工集团太原研究院有限公司 | Intelligent controllable waste gas circulating device for mine and control method |
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| JP4577270B2 (en) * | 2006-05-24 | 2010-11-10 | トヨタ自動車株式会社 | Exhaust gas purification system for internal combustion engine |
| US7581533B1 (en) * | 2008-10-09 | 2009-09-01 | Gm Global Technology Operations, Inc. | Three mode cooler for exhaust gas recirculation |
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Effective date of registration: 20181218 Address after: 102206, Beijing, Shahe Town, Changping District Road, sand Yang Applicant after: Beiqi Futian Automobile Co., Ltd. Address before: 100102 No.1 Courtyard Building, Futong East Street, Chaoyang District, Beijing Applicant before: Auto (China) Co., Ltd. |
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