CN102797595A - Exhaust gas recirculation (EGR) system for diesel engine - Google Patents
Exhaust gas recirculation (EGR) system for diesel engine Download PDFInfo
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- CN102797595A CN102797595A CN2011101413633A CN201110141363A CN102797595A CN 102797595 A CN102797595 A CN 102797595A CN 2011101413633 A CN2011101413633 A CN 2011101413633A CN 201110141363 A CN201110141363 A CN 201110141363A CN 102797595 A CN102797595 A CN 102797595A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention discloses an exhaust gas recirculation (EGR) system for a diesel engine. The EGR system comprises an exhaust pipe (1), a gas inlet pipe (2) and EGR gas taking pipes for connecting the exhaust pipe (1) with the gas inlet pipe (2), wherein the EGR gas taking pipes comprise a first EGR gas taking pipe (31) and a second EGR gas taking pipe (32); EGR waste gas in one half of cylinders of the diesel engine is introduced into the first EGR gas taking pipe (31) through the exhaust pipe (1), and the EGR waste gas in the other half of the cylinders of the diesel engine is introduced into the second EGR gas taking pipe (32) through the exhaust pipe (1); and the EGR waste gas in the two EGR gas taking pipes is finally introduced into the gas inlet pipe (2). According to the technical scheme, the waste gas flows back through the two EGR gas taking pipes, so that the backflow speed of the waste gas is increased; and therefore, the EGR rate is improved, the discharge capacity of harmful gas is reduced, and the performance and the environment-friendly level of the engine are improved.
Description
Technical field
The present invention relates to the diesel engine field, particularly a kind of diesel engine egr system.
Background technique
Along with the continuous progress of fast development of society, science and technology, the quickening of human lives's rhythm, people are increasing to the degree of dependence of the traffic tool quickly and easily; And the present traffic tool, the overwhelming majority is a kind of mode that the chemical energy of oil is converted into mechanical kinetic energy, in conversion process; Produced in a large number to atmosphere, the pollutant harmful to human environment, these pollutants have plenty of harmful especially to human body; As transform the NOx, CO, HC etc. of generation, all be poisonous, harmful gas, so modern vehicles is brought fast, while easily; We must a kind of effective way of demand; Reduce the discharging of the toxic and harmful of motor vehicle in transformation of energy, reduce of the pollution of these toxic gases, the environment of protection human survival environment.
For reducing these noxious gas emissions; Energeticss teacher have sought multiple solution; As optimize the IC engine fuel supply system, improve charge oil pressure, the optimized combustion cell structure, adopt electronic control technology, EGR (scheme for exhaust gas circulation system) technology; Wherein EGR is technological, and promptly the shared percentage of backflow tail gas recently improves burning in the control cylinder.The diesel engine of employing EGR control strategy usually need lead up to the EGR more than 30% could effectively control the NOx discharging.This just needs to improve the backflow of waste gas, and the conventional diesel engine egr system adopts single EGR to get tracheae, carries out tail gas and refluxes; This mode can only rely on the amount that exhaust back pressure improves the tail gas backflow that strengthens merely; And then obtain higher EGR and lead, strengthen the method that exhaust back pressure takes to reduce booster turbine usually, but this method can cause pressurized machine that the pressurized effect of air inlet is descended when increasing exhaust back pressure; Pumping loss in the intensifying cylinder, and then sacrifice the Economy under the high rotating speed.
In addition, the conventional diesel engine egr system adopts the aperture (adopting the vacuum conditions device) of mechanical type control EGR valve, and its control accuracy is poor, and EGR dumb and the diesel engine egr system leads non-adjustable.
Summary of the invention
The present invention aims to provide and a kind ofly adopts two EGR to get tracheae to improve the diesel engine egr system that EGR leads.
For achieving the above object; The invention provides a kind of diesel engine egr system; Comprise outlet pipe, suction tude and be connected outlet pipe and the EGR of suction tude gets tracheae, EGR gets tracheae and comprises that an EGR gets tracheae and the 2nd EGR gets tracheae, and the EGR waste gas of half cylinder of diesel engine gets into an EGR through outlet pipe and gets tracheae; The EGR waste gas of second half cylinder of diesel engine gets into the 2nd EGR through outlet pipe and gets tracheae, and the EGR waste gas that two EGR get in the tracheae finally gets into suction tude.
Further; Outlet pipe comprises: exhaust manifold and many gas exhaust manifolds that link to each other respectively with each cylinder; Exhaust manifold has first inner chamber and second inner chamber of mutual isolation; First inner chamber and second inner chamber are connected with the half gas exhaust manifold respectively, and get tracheae or the 2nd EGR with an EGR respectively and get tracheae and be connected.
Further, EGR gets between tracheae and the suction tude and is provided with Venturi tube, and EGR gets waste gas in the tracheae and gets into suction tude after through the Venturi tube adsorption and drainage.
Further, EGR gets and also is provided with the EGR electromagnetic valve component that is used to control exhaust gas flow between tracheae and the Venturi tube.
Further, the EGR electromagnetic valve component comprises the ECU of solenoid valve and control electromagnetic valve.
Further, diesel engine is six-cylinder diesel engine or four-cylinder diesel engine.
According to technological scheme of the present invention, because the two EGR of this employings get tracheae backflow waste gas, improved the speed of exhaust gas recirculation, and then improved EGR and lead, high EGR leads and has reduced discharge of harmful gases, the performance and the Environmental Protection Level of raising motor.
Description of drawings
Fig. 1 is the schematic diagram according to diesel engine egr system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, an embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention does not receive the restriction of embodiment.
Please referring to Fig. 1 (among the figure shown in the arrow is airflow direction); This diesel engine egr system comprises outlet pipe 1, suction tude 2 and is connected outlet pipe 1 and the EGR of suction tude 2 gets tracheae; EGR gets tracheae and comprises that an EGR gets tracheae 31 and the 2nd EGR gets tracheae 32; Outlet pipe 1 comprises: exhaust manifold and many gas exhaust manifolds that link to each other respectively with each cylinder; Exhaust manifold has first inner chamber and second inner chamber of mutual isolation, and first inner chamber and second inner chamber are connected with the half gas exhaust manifold respectively, and gets tracheae 31 or the 2nd EGR with an EGR respectively and get tracheae 32 and be connected.The EGR waste gas of half cylinder of diesel engine 3 gets into an EGR through outlet pipe 1 and gets tracheae 31, and the EGR waste gas of second half cylinder of diesel engine 3 gets into the 2nd EGR through outlet pipe 1 and gets the EGR waste gas that 32, two EGR of tracheae get in the tracheae and finally get into suction tude 2.(be EGR waste gas gets into earlier exhaust manifold through gas exhaust manifold first inner chamber or second inner chamber, get into by first inner chamber or second inner chamber again that an EGR gets tracheae 31 or the 2nd EGR gets tracheae 32, get into the cylinder that suction tude 2 flows back to motor then).Diesel engine is six-cylinder diesel engine or four-cylinder diesel engine.Owing to adopted two EGR to get the diesel engine egr system of tracheae, improved the speed of exhaust gas recirculation, and then improved EGR and lead, make the EGR under the motor different load lead the level that can both reach desirable.
It can also be seen that by Fig. 1 EGR gets between tracheae and the suction tude 2 and is provided with Venturi tube 5, the waste gas that EGR gets in the tracheae passes through to get into suction tude 2 after Venturi tube 5 adsorption and drainage.After fresh air got into Venturi tube 5, according to Hydrodynamics Theory, air-flow will speed up at throat's contraction section of Venturi tube 5, and the air pressure here will reduce.EGR waste gas is introduced by the lowpressure place, and lowpressure has the adsorption and drainage effect to waste gas, can improve the speed that exhaust gas recirculation is gone into cylinder, leads thereby improve EGR.
Preferably, EGR gets and also is provided with the EGR electromagnetic valve component 7 that is used to control exhaust gas flow between tracheae and the Venturi tube 5.EGR electromagnetic valve component 7 comprises the ECU of solenoid valve and control electromagnetic valve.ECU can accurately control the aperture of EGR electromagnetic valve component 7, the amount of control exhaust gas recirculation, thus the EGR that guarantees diesel emission under the different load leads demand.
Be the working procedure that example specifies this diesel engine egr system below with the six-cylinder diesel engine:
As shown in Figure 1, the EGR waste gas of motor the 1st, the 2nd and the 3rd cylinder is got the EGR waste gas of tracheae the 31, the 4, the 5th and the 6th cylinder and is got tracheae 32 through outlet pipe 1 entering the 2nd EGR through outlet pipe 1 entering the one EGR.Two-way EGR gets gas branch pipe and again waste gas is sent into cooler for recycled exhaust gas 6 and cool off; In the rear end of cooler 6 EGR one-way valve 8 is housed; The effect of EGR one-way valve 8 is that two-way waste gas is guaranteed again that when this converges the fresh air of suction tude 2 does not flow backwards to vent systems, guarantees the smooth and easy of air inlet system and exhaust system air-flow.
The entering of EGR waste gas is arranged on EGR and gets the Venturi tube 5 between tracheae and the suction tude 2 then, and the waste gas that EGR gets in the tracheae passes through to get into suction tude 2 after Venturi tube 5 adsorption and drainage.The part waste gas of motor is discharged 4 pairs of fresh airs of driving pressurized machine and is carried out supercharging from outlet pipe 1; Fresh air also gets into Venturi tube 5 through intercooler 9; After fresh air gets into Venturi tube 5; According to Hydrodynamics Theory, air-flow will speed up at throat's contraction section of Venturi tube 5, and the air pressure here will reduce.EGR waste gas is introduced by the lowpressure place, and lowpressure has the adsorption and drainage effect to waste gas, can improve the speed that exhaust gas recirculation is gone into cylinder, leads thereby improve EGR.
EGR gets the EGR electromagnetic valve component 7 that also is provided with control EGR exhaust gas flow between tracheae and the Venturi tube 5.EGR electromagnetic valve component 7 comprises the ECU of solenoid valve and control electromagnetic valve.The EGR waste gas that EGR gets in the tracheae gets into Venturi tube 5 again through solenoid valve.
Through Venturi tube 5, EGR waste gas mixes the cylinder of back through suction tude 2 entering motors with fresh air, so just realized the recycle of waste gas, has reduced discharge of harmful gases.
According to technological scheme of the present invention; Because this employings couple EGR get tracheae backflow waste gas, have improved the speed of exhaust gas recirculation, and then improved EGR and led; Through overtesting; Each loading point EGR leads and can reach 20%-30% this Twin channel egr system in the engine emission district, and high EGR leads and reduced discharge of harmful gases, improves the performance and the Environmental Protection Level of motor.
More than disclosedly be merely a specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (6)
1. diesel engine egr system; Comprise outlet pipe (1), suction tude (2) and be connected said outlet pipe (1) and the EGR of suction tude (2) gets tracheae; It is characterized in that; Said EGR gets tracheae and comprises that an EGR gets tracheae (31) and the 2nd EGR gets tracheae (32); The EGR waste gas of half cylinder of diesel engine gets into a said EGR through said outlet pipe (1) and gets tracheae (31), and the EGR waste gas of second half cylinder of said diesel engine gets into said the 2nd EGR through said outlet pipe (1) and gets tracheae (32), and two EGR get the final said suction tude (2) that gets into of EGR waste gas in the tracheae.
2. diesel engine egr system according to claim 1; It is characterized in that; Said outlet pipe (1) comprising: exhaust manifold and many gas exhaust manifolds that link to each other respectively with each cylinder; Said exhaust manifold has first inner chamber and second inner chamber of mutual isolation, and said first inner chamber and second inner chamber are connected with the said gas exhaust manifold of half respectively, and gets tracheae (31) or the 2nd EGR with a said EGR respectively and get tracheae (32) and be connected.
3. diesel engine egr system according to claim 1 and 2; It is characterized in that; Said EGR gets between tracheae and the said suction tude (2) and is provided with Venturi tube (5), and said EGR gets waste gas in the tracheae and gets into said suction tude (2) after through said Venturi tube (5) adsorption and drainage.
4. diesel engine egr system according to claim 3 is characterized in that, said EGR gets and also is provided with the EGR electromagnetic valve component (7) that is used to control exhaust gas flow between tracheae and the said Venturi tube (5).
5. diesel engine egr system according to claim 4 is characterized in that, said EGR electromagnetic valve component (7) comprises the ECU of solenoid valve and the said solenoid valve of control.
6. diesel engine egr system according to claim 1 is characterized in that, said diesel engine is six cylinders or four-cylinder diesel engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101413633A CN102797595A (en) | 2011-05-25 | 2011-05-25 | Exhaust gas recirculation (EGR) system for diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101413633A CN102797595A (en) | 2011-05-25 | 2011-05-25 | Exhaust gas recirculation (EGR) system for diesel engine |
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| CN102797595A true CN102797595A (en) | 2012-11-28 |
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| CN2011101413633A Pending CN102797595A (en) | 2011-05-25 | 2011-05-25 | Exhaust gas recirculation (EGR) system for diesel engine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103470408A (en) * | 2013-09-23 | 2013-12-25 | 中国船舶重工集团公司第七一一研究所 | EGR (Exhaust Gas Recirculation) system used for marine medium-speed diesel engine |
| CN105201692A (en) * | 2015-10-30 | 2015-12-30 | 广西玉柴机器股份有限公司 | Internal combustion engine high-low pressure cut-off EGR system |
| CN107725221A (en) * | 2017-11-02 | 2018-02-23 | 广西玉柴机器股份有限公司 | The high pressure hot junction egr system of engine |
| CN107795412A (en) * | 2017-11-02 | 2018-03-13 | 广西玉柴机器股份有限公司 | The low pressure cold end egr system of engine |
| CN107859575A (en) * | 2017-11-02 | 2018-03-30 | 广西玉柴机器股份有限公司 | The low pressure hot junction egr system of engine |
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| US20040011036A1 (en) * | 2000-05-22 | 2004-01-22 | Ove Sponton | Method and device for exhaust recycling and supercharged diesel engine |
| US20060021346A1 (en) * | 2004-07-23 | 2006-02-02 | Chris Whelan | Pressure boosted IC engine with exhaust gas recirculation |
| CN101761421A (en) * | 2008-12-23 | 2010-06-30 | 迪尔公司 | Temperature controlled venturi for use with an egr system in an internal combustion engine |
| CN201714511U (en) * | 2010-07-09 | 2011-01-19 | 温州大学 | electric control exhaust gas recirculation valve of integrated Venturi tube |
| CN202125377U (en) * | 2011-05-25 | 2012-01-25 | 广西玉柴机器股份有限公司 | EGR (Exhaust Gas Recircualtion) system of diesel engine |
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2011
- 2011-05-25 CN CN2011101413633A patent/CN102797595A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040011036A1 (en) * | 2000-05-22 | 2004-01-22 | Ove Sponton | Method and device for exhaust recycling and supercharged diesel engine |
| CN1405443A (en) * | 2001-06-05 | 2003-03-26 | 奥尔塞特工程有限公司 | Mixing of fluid flow |
| US20060021346A1 (en) * | 2004-07-23 | 2006-02-02 | Chris Whelan | Pressure boosted IC engine with exhaust gas recirculation |
| CN101761421A (en) * | 2008-12-23 | 2010-06-30 | 迪尔公司 | Temperature controlled venturi for use with an egr system in an internal combustion engine |
| CN201714511U (en) * | 2010-07-09 | 2011-01-19 | 温州大学 | electric control exhaust gas recirculation valve of integrated Venturi tube |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103470408A (en) * | 2013-09-23 | 2013-12-25 | 中国船舶重工集团公司第七一一研究所 | EGR (Exhaust Gas Recirculation) system used for marine medium-speed diesel engine |
| CN105201692A (en) * | 2015-10-30 | 2015-12-30 | 广西玉柴机器股份有限公司 | Internal combustion engine high-low pressure cut-off EGR system |
| CN107725221A (en) * | 2017-11-02 | 2018-02-23 | 广西玉柴机器股份有限公司 | The high pressure hot junction egr system of engine |
| CN107795412A (en) * | 2017-11-02 | 2018-03-13 | 广西玉柴机器股份有限公司 | The low pressure cold end egr system of engine |
| CN107859575A (en) * | 2017-11-02 | 2018-03-30 | 广西玉柴机器股份有限公司 | The low pressure hot junction egr system of engine |
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Application publication date: 20121128 |