CN207554222U - A kind of egr system - Google Patents
A kind of egr system Download PDFInfo
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- CN207554222U CN207554222U CN201721069988.2U CN201721069988U CN207554222U CN 207554222 U CN207554222 U CN 207554222U CN 201721069988 U CN201721069988 U CN 201721069988U CN 207554222 U CN207554222 U CN 207554222U
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- engine
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- air inlet
- pressure
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Abstract
This application discloses a kind of egr systems, including engine, booster, cooler for recycled exhaust gas, charge air cooler and circulation line, the turbine air inlet of booster is connected with the exhaust outlet of engine, the exhaust outlet of the compressor of booster is connected with the air inlet of engine, charge air cooler is set between compressor and the air inlet of engine, cooler for recycled exhaust gas is set on circulation line, and the import of circulation line is connected between the air inlet of turbine and the exhaust outlet of engine；The outlet of circulation line is before the air inlet of compressor.Since turbine and compressor coaxially operate, the pressure after pressure and compressor before turbine is both greater than atmospheric pressure, and the pressure subatmospheric power before compressor, therefore the inlet pressure of circulation line is more than the outlet pressure of circulation line, improves driving pressure difference, compared with prior art, realize higher EGR rate, and the pumping loss of engine is reduced, so as to reduce oil consumption, it ensure that the transient response of engine.
Description
Technical field
The utility model is related to engine exhaust gas treatment technical field, more particularly to a kind of egr system.
Background technology
The major technique for effectively reducing internal combustion engine nitrogen oxides at present is (useless for SCR (selective catalytic reduction) technologies and EGR
Gas recycles) technology, SCR technology is to post-process exhaust gas, and catalysis reduction is carried out to exhaust gas in external engine.And EGR
Technology is that the exhaust gas that internal combustion engine is discharged is introduced into engine to participate in burning again, and playing reduces oxygen concentration and ignition temperature
Effect, so as to reduce the generation of nitrogen oxides.
Existing EGR technology is broadly divided into high pressure EGR technology and low pressure EGR technology, as shown in Figure 1, high pressure EGR technology be from
Exhaust gas is taken before the turbine 21 of booster 2, exhaust gas returns to 1 air inlet pipe of engine by 3 grade components of cooler for recycled exhaust gas, with it is fresh into
Gas mixes；Low pressure EGR technology usually takes exhaust gas after the turbine 21 of booster 2 after after-treatment system, and exhaust gas passes through
3 grade components of cooler for recycled exhaust gas mix before returning to the compressor 22 of booster 2 with new charge.
Realize that high pressure EGR technology needs pressure and admission pressure difference before larger whirlpool, and high pressure EGR system is from turbine
Exhaust gas is taken before machine 21, returns to 1 air inlet pipe of engine, since turbine 21 and compressor 22 coaxially operate, if improving turbine
Pressure before 21, then pressure can also be promoted after compressor 22, and two pressure all superatmospheric power leads to pressure and air inlet pressure before whirlpool
Force difference value is smaller, is bound to cause the increase of engine pumping loss in this way, so as to increase oil consumption consumption.And low pressure EGR technology needs
Exhaust gas is introduced after the post processing after turbine 21, be influenced in pipeline arrangement by engine and arrangement, it is more difficult to real
It is existing, and low pressure EGR technology pipeline is longer, causes the engine transient response time longer, it is difficult to meet increasingly strict discharge
Regulation demand.
In conclusion the engine pumping loss for how solving high pressure EGR technology is larger, oil consumption is high, and low pressure EGR technology
Pipeline arrangement it is limited, the problem of engine transient response time is longer, become that those skilled in the art are urgently to be resolved hurrily to be asked
Topic.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of egr system, with before high pressure EGR technology is used
It puts, improves pressure and the difference of admission pressure before whirlpool, improve EGR rate, shorten the engine transient response time.
In order to achieve the above objectives, the utility model provides following technical scheme：
A kind of egr system, including engine, booster, cooler for recycled exhaust gas, charge air cooler and circulation line, the booster
Turbine air inlet is connected with the exhaust outlet of the engine, the exhaust outlet of the compressor of the booster and the engine
Air inlet connects, and the charge air cooler is set between the air inlet of the compressor and the engine, and the cooler for recycled exhaust gas is set
It is placed on the circulation line, the import of the circulation line is connected to the air inlet of the turbine and the row of the engine
Between gas port；The outlet of the circulation line is before the air inlet of the compressor.
Preferably, in above-mentioned egr system, the grain catcher being set on the circulation line is further included.
Preferably, in above-mentioned egr system, the grain catcher is located at the cooler for recycled exhaust gas and the circulation pipe
Between the import on road.
Preferably, in above-mentioned egr system, the grain catcher is DPF wall flow type particle traps or metal half
Flow type grain catcher.
Preferably, in above-mentioned egr system, the inner surface of the grain catcher is provided with oxidation catalyst layer.
Preferably, in above-mentioned egr system, EGR valve is provided on the circulation line.
Preferably, in above-mentioned egr system, the EGR valve is located at the air inlet of the cooler for recycled exhaust gas and the compressor
Between mouthful.
Compared with prior art, the beneficial effects of the utility model are：
In egr system provided by the utility model, the import of circulation line is connected to the air inlet of the turbine of booster
Between the exhaust outlet of engine, before the import of compressor that the outlet of circulation line is connected to booster.During work, from increasing
Exhaust gas is taken before the turbine of depressor, exhaust gas before returning to the compressor of booster, mixes after cooler for recycled exhaust gas with fresh air
Afterwards, engine intake is returned to using compressor and charge air cooler.Since the turbine and compressor of booster coaxially operate, because
This, the pressure after pressure and compressor before turbine is both greater than atmospheric pressure, and is pressurized after compressor compressed gas, then calms the anger
Pressure subatmospheric power before machine, therefore, the inlet pressure of circulation line are more than the outlet pressure of circulation line, improve drive
Dynamic pressure is poor, realizes higher EGR rate.Compared with existing high pressure EGR system, do not need to by increase before turbine pressure come
It realizes larger driving pressure difference, while EGR rate is improved, reduces oil consumption.It, can be with compared with existing low pressure EGR system
Be arranged in engine side, there is no vehicle pipeline arrangement influence, furthermore the circulation line relatively low pressure of the egr system
The pipeline of egr system is short, can effectively ensure the transient response of engine.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiment of the utility model, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is a kind of principle schematic of high pressure EGR system of the prior art；
Fig. 2 is the connection diagram of a kind of egr system that the utility model embodiment provides；
Fig. 3 is the connection diagram of another egr system that the utility model embodiment provides；
Fig. 4 is the connection diagram of another egr system that the utility model embodiment provides.
Wherein, 1 it is engine, 2 be booster, 21 be turbine, 22 be booster, 3 be cooler for recycled exhaust gas, 4 is circulation pipe
Road, 5 be EGR valve, 6 be charge air cooler, 7 be grain catcher.
Specific embodiment
There is provided a kind of egr systems for the core of the utility model, under the premise of high pressure EGR technology is used, improve
Pressure and the difference of admission pressure, improve EGR rate before whirlpool, shorten the engine transient response time.
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained shall fall within the protection scope of the present invention.
It please refers to Fig.2, the utility model embodiment provides a kind of egr system, cold including engine 1, booster 2, EGR
But device 3, charge air cooler 6 and circulation line 4.Wherein, booster 2 includes turbine 21 and compressor 22, turbine 21 and compressor
22 coaxial operatings, 21 air inlet of turbine are connected with the exhaust outlet of engine 1, the exhaust outlet of compressor 22 and engine 1 into
Gas port connects, and charge air cooler 6 is set between the air inlet of compressor 22 and engine 1, and cooler for recycled exhaust gas 3 is set to circulation line 4
On, the import of circulation line 4 is connected between the air inlet of turbine 21 and the exhaust outlet of engine 1；The outlet of circulation line 4
It is communicated in before the air inlet of compressor 22.
The import of the circulation line 4 of the egr system is connected to the air inlet of the turbine 21 of booster 2 and engine 1
Between exhaust outlet, the outlet of circulation line 4 is connected to before the import of compressor 22 of booster 2.During work, from booster 2
Turbine 21 before take exhaust gas, exhaust gas before returning to the compressor 22 of booster 2, mixes after cooler for recycled exhaust gas 3 with fresh air
After conjunction, 1 air inlet of engine is returned to using compressor 22 and charge air cooler 6.Due to the turbine 21 of booster 2 and compressor 22
Coaxial operating, therefore, the pressure before turbine 21 is consistent with the pressure after compressor 22, both greater than atmospheric pressure, and compressor
It is pressurized after 22 compressed gas, then the pressure subatmospheric power before compressor 22, therefore, the inlet pressure of circulation line 4 is more than
The outlet pressure of circulation line 4 improves driving pressure difference, realizes higher EGR rate.Compared with existing high pressure EGR system,
It does not need to realize larger driving pressure difference by deliberately increasing before turbine 21 pressure, while EGR rate is improved, reduce
Oil consumption.Compared with existing low pressure EGR system, can be arranged in engine side, there is no vehicle pipeline arrangement influence,
Furthermore the pipeline of the 4 relatively low pressure egr system of circulation line of the egr system is short, it can effectively ensure that the transient state of engine is rung
Ying Xing.
As shown in figure 3, further, in the present embodiment, egr system further includes the particle being set on circulation line 4
Trap 7.Since exhaust gas needs to flow through the compressor 22 of booster 2, so particle content cannot be excessively high in exhaust gas, otherwise hold
It easily leads to compressor 22 to fail, so increasing grain catcher 7 in the circulation line 4 of egr system, which can
Effectively to filter the particulate matter in exhaust gas.
Further, in the present embodiment, grain catcher 7 be located at cooler for recycled exhaust gas 3 and circulation line 4 import it
Between.Before being in turbine 21 due to the grain catcher 7, gas temperature is consistent with 1 delivery temperature of engine, particulate matter into
Enter before being cooled down in cooler for recycled exhaust gas 3, carbon particle in particulate matter is burnt again in the case that high temperature is oxygen-containing, will not be always
It is accumulated in particulate matter trap 7, thereby may be ensured that the grain catcher 7 will not block easily.
As an optimization, in the present embodiment, grain catcher 7 can be the common DPF wall-flow particulates of existing diesel
Trap, or half flow type grain catcher of metal.
Further, in the present embodiment, the inner surface of grain catcher is provided with oxidation catalyst layer.Specifically,
The inner surface coating oxidation catalyst of grain trap, to improve granules regeneration efficiency.
For the ease of control loop pipeline 4, as shown in figure 4, in the present embodiment, EGR valve 5 is provided on circulation line 4.
Further, EGR valve 5 is located between cooler for recycled exhaust gas 3 and the air inlet of compressor 22.EGR valve 5 is arranged on EGR
It can be damaged after cooler 3 to avoid EGR valve 5 by high temperature.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or new using this practicality
Type.A variety of modifications of these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide range consistent with features of novelty.
Claims (7)
1. a kind of egr system, including engine (1), booster (2), cooler for recycled exhaust gas (3), charge air cooler (6) and circulation line
(4), turbine (21) air inlet of the booster (2) is connected with the exhaust outlet of the engine (1), the booster (2)
The exhaust outlet of compressor (22) connected with the air inlet of the engine (1), the charge air cooler (6) is set to the compressor
(22) between the air inlet of the engine (1), the cooler for recycled exhaust gas (3) is set on the circulation line (4), special
Sign is that the import of the circulation line (4) is connected to the exhaust of the air inlet and the engine (1) of the turbine (21)
Between mouthful；The outlet of the circulation line (4) is before the air inlet of the compressor (22).
2. egr system according to claim 1, which is characterized in that further include being set on the circulation line (4)
Grain trap (7).
3. egr system according to claim 2, which is characterized in that the grain catcher (7) cools down positioned at the EGR
Between the import of device (3) and the circulation line (4).
4. egr system according to claim 2, which is characterized in that the grain catcher (7) is DPF wall-flow particulates
Half flow type grain catcher of trap or metal.
5. according to claim 2-4 any one of them egr systems, which is characterized in that the inner surface of the grain catcher is set
It is equipped with oxidation catalyst layer.
6. according to claim 1-4 any one of them egr systems, which is characterized in that be provided on the circulation line (4)
EGR valve (5).
7. egr system according to claim 5, which is characterized in that the EGR valve (5) is positioned at the cooler for recycled exhaust gas (3)
Between the air inlet of the compressor (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721069988.2U CN207554222U (en) | 2017-08-24 | 2017-08-24 | A kind of egr system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721069988.2U CN207554222U (en) | 2017-08-24 | 2017-08-24 | A kind of egr system |
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| Publication Number | Publication Date |
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| CN207554222U true CN207554222U (en) | 2018-06-29 |
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| CN201721069988.2U Active CN207554222U (en) | 2017-08-24 | 2017-08-24 | A kind of egr system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145418A (en) * | 2019-05-05 | 2019-08-20 | 天津大学 | A kind of middle pressure gas recirculation system based on two-stage turbocharger |
-
2017
- 2017-08-24 CN CN201721069988.2U patent/CN207554222U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145418A (en) * | 2019-05-05 | 2019-08-20 | 天津大学 | A kind of middle pressure gas recirculation system based on two-stage turbocharger |
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