CN207554223U - A kind of high-low pressure egr system - Google Patents
A kind of high-low pressure egr system Download PDFInfo
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- CN207554223U CN207554223U CN201721432990.1U CN201721432990U CN207554223U CN 207554223 U CN207554223 U CN 207554223U CN 201721432990 U CN201721432990 U CN 201721432990U CN 207554223 U CN207554223 U CN 207554223U
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- pressure egr
- low pressure
- high pressure
- exhaust gas
- cooler
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Abstract
This application discloses a kind of high-low pressure egr systems, including engine, cooler for recycled exhaust gas, booster, high pressure EGR tube road, low pressure EGR pipeline, high pressure EGR valve and low pressure EGR valve, the both ends on high pressure EGR tube road connect respectively with before the turbine of air outlet pipe and after the compressor of air inlet pipe；Cooler for recycled exhaust gas is set to high pressure EGR tube road；High pressure EGR valve is set to high pressure EGR tube road, and the import of high pressure EGR valve and the outlet of cooler for recycled exhaust gas connect；The import of low pressure EGR pipeline is connected between high pressure EGR valve and cooler for recycled exhaust gas, before the outlet of low pressure EGR pipeline is connected to the compressor of air inlet pipe；Low pressure EGR valve is connected to low pressure EGR tube road.High pressure EGR tube road and low pressure EGR pipeline share a cooler for recycled exhaust gas, switch high pressure EGR cycles and low pressure EGR loop according to different engine operating conditions by high pressure EGR valve and low pressure EGR valve, reduce cost.And low pressure EGR system can be arranged in engine side, there is no the influences of vehicle pipeline arrangement, facilitate the arrangement of low pressure EGR system.
Description
Technical field
The utility model is related to engines exhaust gas recirculation technical field, more particularly to a kind of high-low pressure egr system.
Background technology
Existing effective major technique for reducing internal combustion engine nitrogen oxides is SCR and EGR technology, and EGR technology is by internal combustion
The exhaust gas of machine discharge is introduced into engine participates in burning again, plays the role of reducing oxygen concentration and ignition temperature, 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, and high pressure EGR technology is from engine booster
Exhaust gas is taken before device turbine, exhaust gas returns to engine air inlet tube by components such as cooler for recycled exhaust gas, EGR valves, mixed with new charge
It closes；Low pressure EGR technology usually takes exhaust gas after engine supercharger turbine after post processing, and exhaust gas is cooled down by EGR
The components such as device, EGR valve mix before returning to engine compressor with new charge.
High pressure EGR system and low pressure EGR system are separately provided on a usual vehicle, still, two sets of egr systems are directed to
Different engine operating condition operations, when high pressure EGR system works, and low pressure EGR system leaves unused, although different work(can be realized
Can, but cause cost higher.And since low pressure EGR needs to introduce exhaust gas after the post processing after charger turbine,
It is influenced in pipeline arrangement by engine and arrangement, it is more difficult to realize, and low pressure EGR technology pipeline is longer, leads to engine
Transient response time is longer, it is difficult to meet increasingly strict emission regulation demand.
In conclusion how to solve the problem of the higher low pressure EGR system difficult arrangement of cost of existing egr system, become
Those skilled in the art urgent problems to be solved.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of high-low pressure egr system, to reduce cost, and conveniently
The arrangement of low pressure EGR system.
In order to achieve the above objectives, the utility model provides following technical scheme：
A kind of high-low pressure egr system, including engine, cooler for recycled exhaust gas and booster, the turbine setting of the booster
In the air outlet pipe of the engine, the compressor of the booster is set in the air inlet pipe of the engine；
High pressure EGR tube road, low pressure EGR pipeline, high pressure EGR valve and low pressure EGR valve are further included, the high pressure EGR tube road
Both ends connect respectively with before the turbine of the air outlet pipe and after the compressor of the air inlet pipe；
The cooler for recycled exhaust gas is set to the high pressure EGR tube road；
The high pressure EGR valve is set to high pressure EGR tube road, and the high pressure EGR valve import and the EGR it is cold
But the outlet connection of device；
The import of the low pressure EGR pipeline is connected between the high pressure EGR valve and the cooler for recycled exhaust gas, the low pressure
Before the outlet of EGR line is connected to the compressor of the air inlet pipe；
The low pressure EGR valve is connected to the low pressure EGR tube road.
Preferably, it in above-mentioned high-low pressure egr system, further includes and is set to the high pressure EGR tube road or the low pressure
Granule capturing device on EGR line and before the import of the compressor.
Preferably, in above-mentioned high-low pressure egr system, the granule capturing device is set to the high pressure EGR tube road
On, and the outlet of the granule capturing device is connect with the import of the cooler for recycled exhaust gas.
Preferably, in above-mentioned high-low pressure egr system, the granule capturing device is DPF wall flow type particle traps
Or half flow type grain catcher of metal.
Preferably, in above-mentioned high-low pressure egr system, the charge air cooler after being set to the compressor of air inlet pipe is further included.
Compared with prior art, the beneficial effects of the utility model are：
In high-low pressure egr system provided by the utility model, high pressure EGR tube road and low pressure EGR pipeline connection, and lead to respectively
Cross high pressure EGR valve and low pressure EGR valve control break-make.When high pressure EGR valve is opened, and low pressure EGR valve is closed, exhaust gas is from air outlet pipe
Turbine advances into high pressure EGR tube road, after cooler for recycled exhaust gas and high pressure EGR valve, enters after the compressor of air inlet pipe and starts
Machine realizes the function of high pressure EGR system；When low pressure EGR valve is opened, and high pressure EGR valve is closed, exhaust gas is from the turbine of air outlet pipe
High pressure EGR tube road is advanced into, after cooler for recycled exhaust gas, into low pressure EGR pipeline, after low pressure EGR valve, from calming the anger for air inlet pipe
Machine advances into air inlet pipe, and engine is entered after compressor, realizes the function of low pressure EGR system.As it can be seen that high pressure EGR tube road and
Low pressure EGR pipeline shares a cooler for recycled exhaust gas, is switched by high pressure EGR valve and low pressure EGR valve according to different engine operating conditions
High pressure EGR is recycled and low pressure EGR loop, reduces cost.And low pressure EGR system directly takes gas before the turbine of air outlet pipe,
It from air inlet before the compressor of air inlet pipe, can be arranged in engine side, there is no the influences of vehicle pipeline arrangement, facilitate low
Press the arrangement of egr system.
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 the structure diagram of a kind of high-low pressure egr system that the utility model embodiment provides；
Fig. 2 is the structure diagram of another high-low pressure egr system that the utility model embodiment provides；
Fig. 3 is the structure diagram of another high-low pressure egr system that the utility model embodiment provides.
Wherein, 1 it is booster, 101 be turbine, 102 be compressor, 2 be air outlet pipe, 3 be engine, 4 is high pressure EGR
Pipeline, 5 be cooler for recycled exhaust gas, 6 be high pressure EGR valve, 7 be low pressure EGR pipeline, 8 be low pressure EGR valve, 9 be air inlet pipe, 10 be particle
Capturing device.
Specific embodiment
The core of the utility model reduces cost, and facilitate low pressure EGR there is provided a kind of high-low pressure egr system
The arrangement of system.
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.1 shown in-Fig. 3, the utility model embodiment provides a kind of high-low pressure egr system, including engine
3rd, cooler for recycled exhaust gas 5, booster 1, high pressure EGR tube road 4, high pressure EGR valve 6, low pressure EGR pipeline 7 and low pressure EGR valve 8.
Wherein, booster 1 includes the turbine 101 rotated coaxially and compressor 102, turbine 101 are set to engine 3
Air outlet pipe 2 in, the compressor 102 of booster 1 is set in the air inlet pipe 9 of engine 3；
The both ends on high pressure EGR tube road 4 connect respectively with before the turbine of air outlet pipe 2 and after the compressor of air inlet pipe 9, EGR
Cooler 5 is set on high pressure EGR tube road 4；
High pressure EGR valve 6 is set on high pressure EGR tube road 4, and the import of high pressure EGR valve 6 and the outlet of cooler for recycled exhaust gas 5 connect
It connects；
The import of low pressure EGR pipeline 7 is connected between high pressure EGR valve 6 and cooler for recycled exhaust gas 5, the outlet of low pressure EGR pipeline 7
Before being connected to the compressor of air inlet pipe 9, low pressure EGR valve 8 is connected on low pressure EGR pipeline 7.
The operation principle and the course of work of the high-low pressure egr system be：
When engine 3 is in transient condition, high pressure EGR valve 6 is opened, and low pressure EGR valve 8 is closed, and exhaust gas is from air outlet pipe 2
Turbine advances into high pressure EGR tube road 4, and after cooler for recycled exhaust gas 5 and high pressure EGR valve 6, hair is entered after the compressor of air inlet pipe 9
Motivation 3 realizes the function of high pressure EGR system；When engine is in steady state condition, low pressure EGR valve is opened, and high pressure EGR valve 6 is closed
It closes, the turbine of exhaust gas from air outlet pipe 2 advances into high pressure EGR tube road 4, after cooler for recycled exhaust gas 5, into low pressure EGR pipeline 7, warp
After low pressure EGR valve 8, air inlet pipe 9 is advanced into from the compressor of air inlet pipe 9, engine 3 is entered after compressor 102, realizes low pressure
The function of egr system.
As it can be seen that high pressure EGR tube road 4 and low pressure EGR pipeline 7 share a cooler for recycled exhaust gas 5, by high pressure EGR valve 6 and low
EGR valve 8 is pressed to be reduced into according to different engine operating conditions and intake and exhaust pressure difference switching high pressure EGR cycles and low pressure EGR loop
This.And low pressure EGR system directly takes gas before the turbine of air outlet pipe 2, from air inlet before the compressor of air inlet pipe 9, can send out
3 side of motivation is arranged, and there is no the influences of vehicle pipeline arrangement, facilitate the arrangement of low pressure EGR system.
As shown in Fig. 2, further, in the present embodiment, high-low pressure egr system, which further includes, is set to high pressure EGR tube road 4
Or the granule capturing device 10 on low pressure EGR pipeline 7 and before the import of compressor 102.In low pressure EGR loop, due to
Exhaust gas needs to flow through the compressor 102 of booster 1, so particle content cannot be excessively high in exhaust gas, be otherwise easy to cause and calm the anger
Machine 102 fails, so on the low pressure EGR loop path of high-low pressure egr system, and the position before compressor 102 increases
Grain catcher 10, the grain catcher 10 can effectively filter the particulate matter in exhaust gas.
Further, in the present embodiment, granule capturing device 10 is set on high pressure EGR tube road 4, and granule capturing
The outlet of device 10 is connect with the import of cooler for recycled exhaust gas 5.Before turbine 101 being in due to the grain catcher 10, gas temperature
Degree is consistent with 3 delivery temperature of engine, and before particulate matter cools down in cooler for recycled exhaust gas 5 is entered, the carbon particle in particulate matter is in height
It is burnt again in the case of temperature is oxygen-containing, will not always be accumulated in particulate matter trap 10, thereby may be ensured that the particle is caught
Storage 10 will not block easily.
As an optimization, in the present embodiment, grain catcher 10 can be the common DPF wall-flow particulates of existing diesel
Trap, or half flow type grain catcher of metal.
As shown in figure 3, in the present embodiment, high-low pressure egr system, which further includes, to be set to after the compressor of air inlet pipe 9
Cooler 11.When carrying out low pressure EGR loop, exhaust gas enters engine 3 after compressor 102 and charge air cooler 11.
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 (5)
1. a kind of high-low pressure egr system, including engine, cooler for recycled exhaust gas and booster, the turbine of the booster is set to
In the air outlet pipe of the engine, the compressor of the booster is set in the air inlet pipe of the engine；
It is characterized in that, high pressure EGR tube road, low pressure EGR pipeline, high pressure EGR valve and low pressure EGR valve are further included, the high pressure EGR
The both ends of pipeline connect respectively with before the turbine of the air outlet pipe and after the compressor of the air inlet pipe；
The cooler for recycled exhaust gas is set to the high pressure EGR tube road；
The high pressure EGR valve is set to the high pressure EGR tube road, and the import of the high pressure EGR valve and the cooler for recycled exhaust gas
Outlet connection；
The import of the low pressure EGR pipeline is connected between the high pressure EGR valve and the cooler for recycled exhaust gas, the low pressure EGR tube
Before the outlet on road is connected to the compressor of the air inlet pipe；
The low pressure EGR valve is connected to the low pressure EGR tube road.
2. high-low pressure egr system according to claim 1, which is characterized in that further include and be set to the high pressure EGR tube road
Or low pressure EGR tube road and the granule capturing device before the import of the compressor.
3. high-low pressure egr system according to claim 2, which is characterized in that the granule capturing device is set to described
High pressure EGR tube road, and the outlet of the granule capturing device is connect with the import of the cooler for recycled exhaust gas.
4. high-low pressure egr system according to claim 2, which is characterized in that the granule capturing device is DPF wall-flow types
Half flow type grain catcher of grain catcher or metal.
5. high-low pressure egr system according to claim 1, which is characterized in that further include the compressor for being set to air inlet pipe
Charge air cooler afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721432990.1U CN207554223U (en) | 2017-10-31 | 2017-10-31 | A kind of high-low pressure egr system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721432990.1U CN207554223U (en) | 2017-10-31 | 2017-10-31 | A kind of high-low pressure egr system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207554223U true CN207554223U (en) | 2018-06-29 |
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ID=62681723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721432990.1U Active CN207554223U (en) | 2017-10-31 | 2017-10-31 | A kind of high-low pressure egr system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111828206A (en) * | 2019-04-18 | 2020-10-27 | 上海汽车集团股份有限公司 | Single-stage supercharged diesel engine |
| CN111894766A (en) * | 2020-07-27 | 2020-11-06 | 东风商用车有限公司 | Vehicle system with low-pressure EGR loop |
-
2017
- 2017-10-31 CN CN201721432990.1U patent/CN207554223U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111828206A (en) * | 2019-04-18 | 2020-10-27 | 上海汽车集团股份有限公司 | Single-stage supercharged diesel engine |
| CN111894766A (en) * | 2020-07-27 | 2020-11-06 | 东风商用车有限公司 | Vehicle system with low-pressure EGR loop |
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