CN105545536A - EGR direct injection system for internal combustion engine - Google Patents
EGR direct injection system for internal combustion engine Download PDFInfo
- Publication number
- CN105545536A CN105545536A CN201610081621.6A CN201610081621A CN105545536A CN 105545536 A CN105545536 A CN 105545536A CN 201610081621 A CN201610081621 A CN 201610081621A CN 105545536 A CN105545536 A CN 105545536A
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- Prior art keywords
- egr
- pipe
- outlet
- high pressure
- pressure egr
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
-
- 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses an EGR direct injection system for an internal combustion engine. A low-pressure EGR pipe (12) is connected with an exhaust pipe (11) and a high-pressure EGR pipe (15), a low-pressure EGR valve (13) is installed on the low-pressure EGR pipe (12), and a high-pressure EGR valve (14) is installed on the high-pressure EGR pipe (15); an inlet of an EGR pump (18) is connected with an exhaust manifold (10) through the high-pressure EGR pipe (15), an outlet of the EGR pump (18) is connected with an inlet of an EGR air track (20) through an EGR air track connecting pipe (19), an outlet of the EGR air track (20) is connected with an EGR nozzle (22) through an EGR supply pipe (21), and the EGR nozzle (22) is installed on a cylinder (9) or in an air inlet channel close to the cylinder (9).
Description
Technical field
The present invention relates to a kind of direct-injection system, relate to a kind of internal-combustion engine EGR direct-injection system in particular, belong to exhaust gas recirculatioon (EGR) the systems technology field in gas engine field.
Background technique
At present, in the face of increasingly severe environmental crisis, various countries are more and more stricter to the requirement of Abgasgesetz, and therefore emissions reduction becomes the Main way of internal combustion engine development.Egr system is as reduction internal-combustion engine NO
xeffective emission controls by improving combustion measure of discharge is also one of important technology route of low emission gas engine.Traditional egr system, by setting up EGR circuit between outlet pipe and suction tude, introducing gas handling system by waste gas and mixing with fresh charge, then enters in cylinder with fresh charge and participates in burning, realize the control to fire emission.This traditional egr system simple possible, but it exists following problem: on the one hand, there is operating lag effect in egr system, excessive EGR rate may be there is in acceleration or loading procedure, cause effulent sharply to rise, incomplete combustion, instability even catch fire; On the other hand, when EGR rate is larger, a large amount of exhaust is incorporated into suction tude, exhaust is deteriorated with the mixed effect of fresh charge, cause EGR to mix and each cylinder EGR distributes uneven, make the too high and combustion instability of part cylinder effluent concentration, the discharge of motor and performance are all had a negative impact.
Chinese Patent Application No. is 201120382503.1, name is called that the utility model patent of " a kind of exhaust gas recirculation structure of diesel engine " describes a kind of egr of diesel engine, it, by increasing EGR distribution piping between EGR valve and intake manifold, makes the EGR rate of each cylinder be easier to reach even.Chinese Patent Application No. is CN201210080055.9, name is called that the patent of invention of " a kind of EGR of solution drives the method and system of stagnant ring " describes the method and system that a kind of EGR of solution drives stagnant ring, contact between its variation tendency by aperture needed for the reality of setting up EGR and EGR characteristic curve, eliminates inconsistent due to variation tendency and EGR that is that cause drives retardation phenomenon.But the improvement of above-mentioned patent just to convention EGR systems, fundamentally can not solve EGR and to postpone and EGR amount such as accurately to control at the problem; Therefore, still do not have a kind of method can solve the problems such as the operating lag of EGR under instantaneous conditions well at present, under instantaneous conditions, the accurate control of egr system is still field of internal combustion engine urgent need to solve the problem.
Summary of the invention
The object of the invention is to problems such as postponing for existing egr system, EGR amount accurately controls, a kind of internal-combustion engine EGR direct-injection system is provided.
for achieving the above object, technical solution of the present invention is:a kind of internal-combustion engine EGR direct-injection system, comprise gas compressor, turbo machine, air intake intercooler, motor, cylinder, low pressure EGR pipe, described compressor air inlet machine mouth is connected with suction tude, gas compressor air outlet is connected with air intake intercooler import by gas compressor steam outlet pipe, described air intake intercooler outlet is connected with motor by intake manifold, described turbine inlet is connected with motor by exhaust manifold, turbine outlet is connected with outlet pipe, described gas compressor is connected by coupling shaft with between turbo machine, also include high pressure EGR pipe, EGR pump, EGR gas rail and EGR nozzle), described low pressure EGR pipe connects outlet pipe and high pressure EGR pipe, low pressure EGR pipe is provided with low pressure EGR valve, high pressure EGR pipe is provided with high pressure EGR valve, described EGR pump inlet is connected with exhaust manifold by high pressure EGR pipe, EGR pump discharge is connected with the import of EGR gas rail by EGR gas rail connecting tube, described EGR gas rail outlet is connected with EGR nozzle by EGR supplying pipe, described EGR nozzle is arranged on cylinder or in the intake duct of cylinder.
Also include EGR intercooler, described EGR intercooler import is connected with high pressure EGR pipe, and EGR intercooler outlet is connected with EGR pump inlet by EGR pump connecting tube.
compared with prior art, the invention has the beneficial effects as follows:
1, in the present invention, EGR pump inlet is connected with exhaust manifold by high pressure EGR pipe, EGR pump discharge is connected with the import of EGR gas rail by EGR gas rail connecting tube, the outlet of EGR gas rail is connected with EGR nozzle by EGR supplying pipe, and EGR nozzle is arranged on cylinder or in the intake duct of cylinder.By arranging EGR gas rail, and maintain EGR gas rail internal pressure by EGR pump; And EGR nozzle is connected with EGR gas rail, by EGR nozzle, waste gas is directly sprayed in engine cylinder, thus make it possible to by control EGR nozzle, waste gas in EGR gas rail accurately be sprayed in cylinder, achieve the quick response of EGR, effectively avoid EGR operating lag, avoid because between the air inlet mixing uneven each cylinder caused, EGR distributes uneven.
2, establish high pressure and low pressure two kinds of EGR circuit in the present invention, get gas mode by control high pressure EGR valve and low pressure EGR valve control EGR pump, achieve and get gas strategy flexibly.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, suction tude 1, gas compressor 2, coupling shaft 3, turbo machine 4, gas compressor steam outlet pipe 5, air intake intercooler 6, intake manifold 7, motor 8, cylinder 9, exhaust manifold 10, outlet pipe 11, low pressure EGR pipe 12, low pressure EGR valve 13, high pressure EGR valve 14, high pressure EGR pipe 15, EGR intercooler 16, EGR pump connecting tube 17, EGR pump 18, EGR gas rail connecting tube 19, EGR gas rail 20, EGR supplying pipe 21, EGR nozzle 22.
Embodiment
Illustrate that the present invention is described in further detail with embodiment below in conjunction with accompanying drawing.
See Fig. 1, a kind of internal-combustion engine EGR direct-injection system, comprises gas compressor 2, turbo machine 4, air intake intercooler 6, motor 8, cylinder 9, low pressure EGR pipe 12, high pressure EGR pipe 15, EGR pump 18, EGR gas rail 20 and EGR nozzle 22.Described gas compressor 2 suction port is connected with suction tude 1, and gas compressor 2 air outlet is connected with air intake intercooler 6 import by gas compressor steam outlet pipe 5; Described air intake intercooler 6 is exported and is connected with motor 8 by intake manifold 7.Described turbo machine 4 import is connected with motor 8 by exhaust manifold 10, and turbo machine 4 outlet is connected with outlet pipe 11; Described gas compressor 2 is connected by coupling shaft 3 with between turbo machine 4.Described low pressure EGR pipe 12 connects outlet pipe 11 and high pressure EGR pipe 15, low pressure EGR pipe 12 is provided with low pressure EGR valve 13; High pressure EGR pipe 15 is provided with high pressure EGR valve 14.Described EGR pump 18 import is connected with exhaust manifold 10 by high pressure EGR pipe 15, and EGR pump 18 is exported and is connected with the import of EGR gas rail 20 by EGR gas rail connecting tube 19; Described EGR gas rail 20 is exported and is connected with EGR nozzle 22EGR nozzle 22 by EGR supplying pipe 21, and described EGR nozzle 22 is arranged on cylinder 9 or in the intake duct of cylinder 9; EGR nozzle 22 is arranged on and realizes intake duct in the intake duct near cylinder 9 and directly spray, good response characteristic can be obtained.
See Fig. 1, further, also include EGR intercooler 16, described EGR intercooler 16 import is connected with high pressure EGR pipe 15, and EGR intercooler 16 is exported and is connected with EGR pump 18 import by EGR pump connecting tube 17.
See Fig. 1, the present invention establishes EGR common rail system, provides a kind of EGR in-cylinder direct injection system, is applicable to multi-cylinder boosting internal combustion engine.During work, waste gas enters EGR gas rail 20 by EGR pump 18 pressurization, and maintains certain pressure in EGR gas rail 20, and EGR nozzle 22 is connected with EGR gas rail 20, enters moment and EGR emitted dose in cylinder 9 by the opening and closing control EGR of control EGR nozzle 22.Therefore, the present invention according to cylinder 9 combustion to the demand of EGR rate, the moment in cylinder 9 is entered by the accurate control EGR of EGR nozzle 22, required EGR is accurately sprayed into fast in cylinder 9 and participate in fire emission control, achieve accurately controlling fast EGR, eliminate the unequal problem of EGR response lag and Ge Gang branch of traditional existing egr system, solve the problems such as the operating lag of EGR under instantaneous conditions, ensure that motor 8 has preferably performance and emission effect.
See Fig. 1, meanwhile, mesohigh EGR pipe 15 of the present invention is connected with EGR pump 18 with low pressure EGR pipe 12, and high pressure EGR valve 14 and low pressure EGR valve 13 are arranged on high pressure EGR pipe 15 and low pressure EGR pipe 12 respectively; Namely establish high pressure and low pressure two kinds of EGR circuit, get gas mode by the opening and closing control EGR pump controlling high pressure EGR valve 14 and low pressure EGR valve 13, realize getting gas strategy flexibly.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, said structure all should be considered as belonging to protection scope of the present invention.
Claims (2)
1. an internal-combustion engine EGR direct-injection system, comprise gas compressor (2), turbo machine (4), air intake intercooler (6), motor (8), cylinder (9), low pressure EGR pipe (12), described gas compressor (2) suction port is connected with suction tude (1), gas compressor (2) air outlet is connected with air intake intercooler (6) import by gas compressor steam outlet pipe (5), described air intake intercooler (6) outlet is connected with motor (8) by intake manifold (7), described turbo machine (4) import is connected with motor (8) by exhaust manifold (10), turbo machine (4) outlet is connected with outlet pipe (11), described gas compressor (2) is connected by coupling shaft (3) with between turbo machine (4), it is characterized in that: also include high pressure EGR pipe (15), EGR pump (18), EGR gas rail (20) and EGR nozzle (22), described low pressure EGR pipe (12) connects outlet pipe (11) and high pressure EGR pipe (15), low pressure EGR pipe (12) is provided with low pressure EGR valve (13), high pressure EGR pipe (15) is provided with high pressure EGR valve (14), described EGR pump (18) import is connected with exhaust manifold (10) by high pressure EGR pipe (15), EGR pump (18) outlet is connected with EGR gas rail (20) import by EGR gas rail connecting tube (19), described EGR gas rail (20) outlet is connected with EGR nozzle (22) by EGR supplying pipe (21), described EGR nozzle (22) is arranged in the intake duct of the upper or close cylinder (9) of cylinder (9).
2. a kind of internal-combustion engine EGR direct-injection system according to claim 1, it is characterized in that: also include EGR intercooler (16), described EGR intercooler (16) import is connected with high pressure EGR pipe (15), and EGR intercooler (16) outlet is connected with EGR pump (18) import by EGR pump connecting tube (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610081621.6A CN105545536A (en) | 2016-02-05 | 2016-02-05 | EGR direct injection system for internal combustion engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610081621.6A CN105545536A (en) | 2016-02-05 | 2016-02-05 | EGR direct injection system for internal combustion engine |
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| CN105545536A true CN105545536A (en) | 2016-05-04 |
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| CN201610081621.6A Pending CN105545536A (en) | 2016-02-05 | 2016-02-05 | EGR direct injection system for internal combustion engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106948975A (en) * | 2017-03-31 | 2017-07-14 | 哈尔滨工程大学 | A kind of diesel engine EGR device and its implementation based on large, medium and small three turbocharger |
| CN109184962A (en) * | 2018-09-27 | 2019-01-11 | 潍柴重机股份有限公司 | Exhaust gas in-cylinder direct-jet turbulent combustion system and method |
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2016
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| US6435166B1 (en) * | 1999-06-16 | 2002-08-20 | Komatsu Ltd. | Exhaust gas recirculation device and control method thereof |
| CN2422459Y (en) * | 1999-09-02 | 2001-03-07 | 中国第一汽车集团公司无锡柴油机厂 | Fuel system of gas-diesel oil double fuel engine |
| CN1479360A (en) * | 2002-08-30 | 2004-03-03 | 旺宏电子股份有限公司 | Method of monstoring real defect through eliminating duplicate defect which does not influence acceptance raet |
| CN101424224A (en) * | 2008-11-20 | 2009-05-06 | 张和君 | Electric-controlled natural gas engine operating system and control method thereof |
| CN201513258U (en) * | 2009-10-14 | 2010-06-23 | 上海交通大学 | Hybrid exhaust gas recirculation multi-loop device of series two-stage supercharged engine |
| CN101718224A (en) * | 2009-12-07 | 2010-06-02 | 奇瑞汽车股份有限公司 | Compression-ignition methanol engine and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106948975A (en) * | 2017-03-31 | 2017-07-14 | 哈尔滨工程大学 | A kind of diesel engine EGR device and its implementation based on large, medium and small three turbocharger |
| CN109184962A (en) * | 2018-09-27 | 2019-01-11 | 潍柴重机股份有限公司 | Exhaust gas in-cylinder direct-jet turbulent combustion system and method |
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Application publication date: 20160504 |