CN106762241A - A kind of engine exhaust-gas recirculating system - Google Patents
A kind of engine exhaust-gas recirculating system Download PDFInfo
- Publication number
- CN106762241A CN106762241A CN201710013526.7A CN201710013526A CN106762241A CN 106762241 A CN106762241 A CN 106762241A CN 201710013526 A CN201710013526 A CN 201710013526A CN 106762241 A CN106762241 A CN 106762241A
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- gas
- engine
- exhaust
- air inlet
- egr
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Abstract
The invention discloses a kind of engine exhaust-gas recirculating system, it is related to vehicle.Engine exhaust-gas recirculating system passes through the engine for being provided with air inlet and exhaust outlet, including air inlet pipeline, gas exhaust piping, EGR line and choke valve.The present invention sets choke valve in engine exhaust-gas recirculating system, increased the pressure difference of egr system, increases application of the EGR technology on supercharging gasoline engine.Before air inlet pipeline is arranged at air inlet.Gas exhaust piping is arranged at after exhaust outlet.EGR line is connected between air inlet pipeline and gas exhaust piping.Choke valve is set near gas exhaust piping end, the pressure difference for increasing engine exhaust-gas recirculating system.Choke valve is arranged in the present invention exhaust side of engine, and the arrangement space of choke valve is abundant, easily fixed.By adjusting the aperture of choke valve, the pressure of EGR exhaust outlet point, in the case of EGR exhaust outlet point pressure identical, increases the pressure difference of egr system after the preceding catalyst converter of increase, is allowed to meet the demand of engine.
Description
Technical field
The present invention relates to technical field of vehicle, more particularly to a kind of engine exhaust-gas recirculating system.
Background technology
EGR technology play the role of at aspects such as engines fuel-economizing, emission reductions it is important, with oil consumption and the day of Abgasgesetz
Benefit is harsh, and application of the EGR technology on gasoline supercharging engine is increasingly becoming a kind of trend, and EGR is applied on supercharging gasoline engine
Technology will necessarily turn into a main flow of major main engine plants' engine technologies upgrading.
Application EGR technology is broadly divided into two kinds of technology paths of high pressure EGR and low pressure EGR, gasoline engine on supercharging gasoline engine
High pressure EGR technology scheme relative maturity, but it is relatively small to the oil consumption contribution of engine and vehicle.Low pressure EGR is because in rate of economizing gasoline
Etc. aspect advantageously, be the engine technology upgrading route of relative forward position, main flow at present.
In the development process of low pressure EGR system, egr system pressure difference deficiency is influence low pressure EGR technology application one
Major issue.Egr system pressure difference deficiency will cause EGR exhaust flow to be unsatisfactory for the demand of engine, so as to cause engine quick-fried
The engine irregular working situations such as shake, and then engine damage or engine performance may be caused to be unsatisfactory for requiring.Solve to increase
Hydraulic motor low pressure EGR system pressure reduction problem is that low pressure EGR technology applies a difficulty for having to solve on supercharging gasoline engine
Topic.
The content of the invention
It is an object of the invention to provide a kind of engine exhaust-gas recirculating system that can increase egr system pressure difference.
Especially, the present invention provides a kind of engine exhaust-gas recirculating system, by engine, wherein, the engine
Place has air inlet and exhaust outlet, including：
Air inlet pipeline, before being arranged at the air inlet, the gas for the engine is flowed into；
Gas exhaust piping, is arranged at after the exhaust outlet, for the waste gas discharge of the engine；
EGR line, is connected between the air inlet pipeline and the gas exhaust piping, for will be discharged at the gas exhaust piping
Portion send into after waste gas recycling the air inlet pipeline so that the portion of engine discharge is weighed
It is multiple to utilize；With
Choke valve, is set, the pressure for increasing the engine exhaust-gas recirculating system near the gas exhaust piping end
Difference.
Further, the air inlet pipeline includes admission line, and the turbine being sequentially connected through the admission line increases
Depressor, charge air cooler, air throttle and inlet manifold, wherein, fresh air increases through the admission line into the turbocharger
Through the air inlet of the charge air cooler, the air throttle and the inlet manifold to the engine after pressure,
Wherein, the turbocharger has two groups of air inlet/outlets, and one of which air inlet/outlet is connected to the air inlet pipe
Lu Zhong, another set air inlet/outlet is connected in the gas exhaust piping.
Further, the gas exhaust piping includes discharge duct, and the exhaust discrimination being sequentially connected through the discharge duct
Pipe, the turbocharger, preceding catalyst converter, rear catalyst converter, secondary muffler and main muffler,
Wherein, the choke valve is arranged at the discharge duct between the secondary muffler and the main muffler.
Further, one end of the EGR line is connected to described between the preceding catalyst converter and the rear catalyst converter
At discharge duct, the other end is connected at the admission line before the turbocharger, the other end of the EGR line
It is connected through three-way piece with the admission line,
Wherein, in the engine produce waste gas flow through the exhaust manifold, the turbocharger and it is described before urge
It is divided into two parts, a part of waste gas catalyst converter, the secondary muffler, the choke valve and main noise reduction after described after changing device
Discharged after device, another part waste gas is sent into the air inlet pipeline after carrying out waste gas recycling through the EGR line.
Further, the EGR filter screens that include being sequentially connected with through pipeline according to EGR line described in exhaust gas flow direction, EGR are cold
But device and EGR valve.
Further, temperature sensor, the two of the EGR valve are additionally provided between the EGR valve and the cooler for recycled exhaust gas
Side is provided with differential pressure pickup.
Further, the choke valve is electric throttle valve.
Further, the choke valve is mechanical throttle damper.
Further, it is provided with pressure sensor before the choke valve.
Further, the engine is gasoline supercharging engine.
The present invention sets choke valve in engine exhaust-gas recirculating system, increased the pressure difference of egr system, increases
Application of the EGR technology on supercharging gasoline engine.
Further, the choke valve is arranged in the present invention exhaust side of engine, and the arrangement space of choke valve is abundant,
It is easily fixed；By adjusting the aperture of choke valve, the pressure of EGR exhaust outlet point after the preceding catalyst converter of increase, in EGR exhaust outlet
In the case of point pressure identical, increase the pressure difference of egr system, be allowed to meet the demand of engine.
Further, the position of choke valve is relatively low due to being close to the temperature of the position of main muffler, and relatively low temperature is to section
The material requirements for flowing valve is lower, the mechanical throttle damper for meeting design requirement is can select, for motor-driven valve, it is possible to decrease section
Flow the cost of valve；Ensure that low pressure EGR technology has larger working range on supercharging gasoline engine, can so as to what is applied in guarantee
On the premise of row, the oil-saving effect that low pressure EGR technology is applied on supercharging gasoline engine is improved, and then promoted low pressure EGR
Application of the technology on supercharging gasoline engine.
Brief description of the drawings
Describe some specific embodiments of the invention in detail by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter.
Identical reference denotes same or similar part or part in accompanying drawing.In accompanying drawing：
Fig. 1 is the structural representation according to the engine exhaust-gas recirculating system of one embodiment of the invention.
Specific embodiment
Fig. 1 shows the structural representation of engine exhaust-gas recirculating system in one embodiment of the invention.As seen from the figure, send out
Motivation gas recirculation system will flow out for circulation by engine 10 into the gas of engine 10 and from engine 10
Gas.Wherein there is air inlet and exhaust outlet at engine 10.Engine exhaust-gas recirculating system includes air inlet pipeline 20, exhaust
Pipeline 30, EGR line 40 and choke valve 50.The present invention sets choke valve 50 in engine exhaust-gas recirculating system, increased
The pressure difference of egr system, increases application of the EGR technology on gasoline supercharging engine.
As shown in figure 1, the flow direction of the hollow arrow a meanings in figure is the flow direction of gas in air inlet pipeline 20.
Before air inlet pipeline 20 is arranged at the air inlet, the gas for the engine 10 is flowed into.Solid arrow b shown in figure
The flow direction of signified gas is the flow direction of gas in gas exhaust piping 30.As shown in Figure 1, gas exhaust piping 30 is arranged at the exhaust outlet
Afterwards, the waste gas for the engine 10 is discharged.The flow direction of the gas of the dotted arrow c meanings shown in figure is EGR line
The flow direction of the gas in 40.As shown in figure 1, EGR line 40 is connected between the air inlet pipeline 20 and the gas exhaust piping 30,
In send the portion discharged at the gas exhaust piping 30 into after waste gas recycling the air inlet pipeline 20, so that
The portion of the discharge of the engine 10 is recycled.Wherein, choke valve 50 is set near the end of the gas exhaust piping 30,
Pressure difference for increasing the engine exhaust-gas recirculating system.Preferably, the connection of EGR line 40 and gas exhaust piping 30
Place is arranged on before choke valve 50.Wherein, heretofore described front and rear is defined according to the flow direction of gas.The present invention
Choke valve 50 is arranged in the exhaust side of engine 10, the arrangement space of choke valve 50 is abundant, it is easily fixed.In present system
During use can by adjusting the aperture of choke valve 50, before increase after catalyst converter EGR exhaust outlet point pressure, it is useless in EGR
In the case of gas outlet point pressure identical, increase the pressure difference of egr system, be allowed to meet the demand of engine 10.
The air inlet pipeline 20 includes admission line 21, and be sequentially connected through admission line 21 turbocharger 22,
Charge air cooler 23, air throttle 24 and inlet manifold 25, wherein, air inlet gas enters the turbocharger through the admission line 21
Through the air inlet of the charge air cooler 23, the air throttle 24 and the inlet manifold 25 to the engine 10 after 22 superchargings.
Wherein, the turbocharger 22 has two groups of air inlet/outlets, respectively the first air inlet 221, the first gas outlet
222nd, the second air inlet 223 and the second gas outlet 224.One of which air inlet/outlet is the first air inlet 221 and the first gas outlet
222 are connected in the air inlet pipeline 20, and another set air inlet/outlet is that the second air inlet 223 and the second gas outlet 224 connect
In the gas exhaust piping 30.
Used as a specific embodiment, as shown in Figure 1, air inlet gas first enters into the first air inlet 221 by admission line 21
Enter turbocharger 22 afterwards, after being pressurized by turbocharger 22 by the first gas outlet 222 out, then sequentially pass through charge air cooler
23rd, engine 10 is entered to engine 10 by air inlet by the air inlet of engine 10 after air throttle 24 and inlet manifold 25
Burning is used.
The gas exhaust piping 30 includes discharge duct 31, and the exhaust manifold 32, whirlpool being sequentially connected through discharge duct 31
Wheel booster 22, preceding catalyst converter 33, rear catalyst converter 34, secondary muffler 35 and main muffler 36, wherein, the choke valve 50 is set
At discharge duct between the secondary muffler 35 and the main muffler 36.
One end of the EGR line 40 is connected to the exhaust between the preceding catalyst converter 33 and the rear catalyst converter 34
At pipeline 31, the other end is connected at the admission line 21 before the turbocharger 22, the EGR line 40 it is another
One end is connected with the admission line 21 through three-way piece 60.From EGR line 40 outflow gas at the three-way piece 60 with enter
After the fresh air mixing of air inlet pipeline 20, enter into together in turbocharger 22.
Wherein, what is passed through in gas exhaust piping 30 is the second air inlet 223 and the second gas outlet in turbocharger 22
224.Wherein, the waste gas that the engine 10 is produced is through the exhaust manifold 32, the second air inlet of the turbocharger 22
After 223 enter turbocharger 22 in, then by turbocharger 22 the second gas outlet 224 out, through the preceding catalyst converter 33
It is divided into two parts after catalysis, a part of waste gas catalyst converter 34, the secondary muffler 35, choke valve 50 and described after described
Discharged after main muffler 36, another part waste gas sends into the air inlet pipeline after carrying out waste gas recycling through the EGR line 40
In 20.
EGR filter screens 41, the and of cooler for recycled exhaust gas 42 that EGR line 40 includes being sequentially connected with through pipeline according to exhaust gas flow direction
EGR valve 43.Temperature sensor 44, the two of the EGR valve 43 are additionally provided between the EGR valve 43 and the cooler for recycled exhaust gas 42
Side is provided with differential pressure pickup 45.
Used as a preferred embodiment, usually, the choke valve 50 is electric throttle valve.
As another embodiment, because choke valve 50 is arranged on the tail end of discharge duct 31 close to the place of main muffler 36,
The temperature of the position is relatively low again, and the material requirements of relatively low temperature to choke valve 50 is lower, can select the machine for meeting design requirement
Tool formula choke valve, for motor-driven valve, it is possible to decrease the cost of choke valve 50.To monitor the validity of mechanical throttle damper,
Pressure sensor 51 was provided with before the mechanical throttle damper.
Used as an embodiment, the engine 10 is gasoline supercharging engine.Present invention ensures that low pressure EGR technology is increasing
There is larger working range on pressure gasoline engine, so as on the premise of the feasibility of application is ensured, improve low pressure EGR technology and exist
The oil-saving effect applied on gasoline supercharging engine, and then promoted application of the low pressure EGR technology on supercharging gasoline engine.Extremely
This, although those skilled in the art will appreciate that detailed herein have shown and described multiple exemplary embodiments of the invention,
But, without departing from the spirit and scope of the present invention, still can directly determine or derive according to present disclosure
Go out to meet many other variations or modifications of the principle of the invention.Therefore, the scope of the invention should be understood and defined as covering
All these other variations or modifications.
Claims (10)
1. a kind of engine exhaust-gas recirculating system, by engine, wherein, there is air inlet and exhaust at the engine
Mouthful, including：
Air inlet pipeline, before being arranged at the air inlet, the gas for the engine is flowed into；
Gas exhaust piping, is arranged at after the exhaust outlet, for the waste gas discharge of the engine；
EGR line, is connected between the air inlet pipeline and the gas exhaust piping, for the portion that will be discharged at the gas exhaust piping
Point waste gas send into after waste gas recycling in the air inlet pipeline, so that the portion of engine discharge is repeated profit
With；With
Choke valve, is set, the pressure difference for increasing the engine exhaust-gas recirculating system near the gas exhaust piping end.
2. engine exhaust-gas recirculating system according to claim 1, it is characterised in that
The air inlet pipeline includes admission line, and turbocharger, charge air cooler, the section being sequentially connected through the admission line
Valve and inlet manifold, wherein, air inlet gas through the admission line enter it is described it is turbocharger supercharged after through cold in described
Device, the air throttle and the inlet manifold to the engine air inlet,
Wherein, the turbocharger has two groups of air inlet/outlets, and one of which air inlet/outlet is connected in the air inlet pipeline,
Another set air inlet/outlet is connected in the gas exhaust piping.
3. engine exhaust-gas recirculating system according to claim 2, it is characterised in that the gas exhaust piping includes exhaust
Pipeline, and be sequentially connected through the discharge duct exhaust manifold, the turbocharger, preceding catalyst converter, after catalyst converter, pair
Muffler and main muffler,
Wherein, the choke valve is arranged at the discharge duct between the secondary muffler and the main muffler.
4. engine exhaust-gas recirculating system according to claim 3, it is characterised in that one end of the EGR line connects
It is connected at the discharge duct between the preceding catalyst converter and the rear catalyst converter, the other end is connected to the turbocharger
At the admission line before, the other end of the EGR line is connected with the admission line through three-way piece,
Wherein, the waste gas for being produced in the engine flows through the exhaust manifold, the turbocharger and the preceding catalyst converter
After be divided into two parts, a part of waste gas is after described after catalyst converter, the secondary muffler, the choke valve and the main muffler
Discharge, another part waste gas is sent into the air inlet pipeline after carrying out waste gas recycling through the EGR line.
5. engine exhaust-gas recirculating system according to claim 4, it is characterised in that according to described in exhaust gas flow direction
EGR line includes the EGR filter screens, cooler for recycled exhaust gas and the EGR valve that are sequentially connected with through pipeline.
6. engine exhaust-gas recirculating system according to claim 5, it is characterised in that the EGR valve is cold with the EGR
But temperature sensor is additionally provided between device, the both sides of the EGR valve are provided with differential pressure pickup.
7. the engine exhaust-gas recirculating system according to any one of claim 1-6, it is characterised in that the choke valve
It is electric throttle valve.
8. the engine exhaust-gas recirculating system according to any one of claim 1-6, it is characterised in that the choke valve
It is mechanical throttle damper.
9. engine exhaust-gas recirculating system according to claim 8, it is characterised in that be provided with before the choke valve
Pressure sensor.
10. the engine exhaust-gas recirculating system according to any one of claim 1-9, it is characterised in that described to start
Machine is gasoline supercharging engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710013526.7A CN106762241A (en) | 2017-01-09 | 2017-01-09 | A kind of engine exhaust-gas recirculating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710013526.7A CN106762241A (en) | 2017-01-09 | 2017-01-09 | A kind of engine exhaust-gas recirculating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106762241A true CN106762241A (en) | 2017-05-31 |
Family
ID=58950601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710013526.7A Pending CN106762241A (en) | 2017-01-09 | 2017-01-09 | A kind of engine exhaust-gas recirculating system |
Country Status (1)
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| CN (1) | CN106762241A (en) |
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| CN107201973A (en) * | 2017-07-27 | 2017-09-26 | 奇瑞汽车股份有限公司 | The gas recirculation system and its application method of a kind of gasoline supercharging engine and the automobile engine with it |
| CN110630413A (en) * | 2019-08-21 | 2019-12-31 | 广东工业大学 | EGR engine and control method thereof |
| CN111486026A (en) * | 2019-01-29 | 2020-08-04 | 现代自动车株式会社 | Engine system |
| CN111894765A (en) * | 2019-05-06 | 2020-11-06 | 广州汽车集团股份有限公司 | Exhaust gas recirculation system |
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Application publication date: 20170531 |