CN107795412A - The low pressure cold end egr system of engine - Google Patents
The low pressure cold end egr system of engine Download PDFInfo
- Publication number
- CN107795412A CN107795412A CN201711066440.7A CN201711066440A CN107795412A CN 107795412 A CN107795412 A CN 107795412A CN 201711066440 A CN201711066440 A CN 201711066440A CN 107795412 A CN107795412 A CN 107795412A
- Authority
- CN
- China
- Prior art keywords
- egr
- cooler
- engine
- low pressure
- cold end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
Abstract
The invention discloses a kind of low pressure cold end egr system of engine.The low pressure cold end egr system of the engine includes：Cooler for recycled exhaust gas, exhaust steam passage and cooling passage are respectively equipped with it, the inlet end of the exhaust steam passage and the blast pipe of diesel particulate filters connect, and are cooled down after waste gas is drawn from the blast pipe of diesel particulate filters by heat exchange method；EGR valve, its inlet end are connected with the outlet side of the cooler for recycled exhaust gas exhaust steam passage；EGR mixer, its exhaust gas entrance are connected with the outlet side of the EGR valve, the upstream connection of the air intake of EGR mixer and the compressor of booster；And controller.The low pressure cold end egr system of the engine make it that waste gas and fresh air are mixed well；Because EGR exhaust cools down and temperature after DPF is lower through charge air cooler, lower EGT is obtained, cooler can be made smaller；And the performance of booster is not reduced, having reduces oil consumption potentiality.
Description
Technical field
The present invention relates to engine art, the low pressure cold end egr system of more particularly to a kind of engine.
Background technology
Waste gas recycling (EGR, Exhaust Gas Recirculation) is to reduce the NOx gases production in engine cylinder
Raw effective measures, the system are mainly made up of EGR valve, cooler for recycled exhaust gas, check valve (optional), connecting line and controller.Its
Operation principle is：Send the part exhaust of diesel engine back to cylinder again after cooling, participate in combustion process, in waste gas
Main Ingredients and Appearance is CO2, H2O, N2 etc., and wherein three higher atomic gas CO2 and H2O of specific heat capacity add the ratio of gaseous mixture in cylinder
Thermal capacitance, cylinder temperature before combustion mixture catches fire is reduced, has also declined combustion process temperature；Meanwhile introduce cylinder after EGR
Interior gaseous mixture oxygen content is reduced, and reduces burn rate and rate of heat release, this series of influence can effectively reduce NOx emission
The generation of thing.
It is divided into internal EGR and outside EGR from structure.So-called internal EGR is exactly to allow a part of waste gas not discharge cylinder,
Burning starts preceding dilute gas mixture next time.Internal EGR is controlled by the phase of inlet and outlet door, that is, passes through gazogene
Structure is adjusted.In general, EGR refers to outside EGR, the present invention is mainly suitable for outside EGR design.
Existing External EGR systems use high pressure EGR, and its waste gas of the high pressure EGR system is typically from the row before booster turbine
Draw, returned to after supercharger air compressor in tracheae；The shortcomings that high pressure EGR system, is：1st, higher EGR exhaust temperature is led
Cause cooler for recycled exhaust gas volume bigger；2nd, EGR exhaust is taken before whirlpool, reduces the performance of engine.
The information for being disclosed in the background section is merely intended to understanding of the increase to the general background of the present invention, without answering
It has been the prior art well known to persons skilled in the art when being considered as recognizing or implying the information structure in any form.
The content of the invention
It is an object of the invention to provide a kind of low pressure cold end egr system of simple and reasonable engine, this starts
The low pressure cold end egr system of machine takes EGR exhaust after DPF, returns to before supercharger air compressor so that waste gas and fresh air
Mixed well；Because EGR exhaust cools down and temperature after DPF is lower through charge air cooler, lower EGT is obtained,
Cooler can be made smaller；And the performance of booster is not reduced, having reduces oil consumption potentiality.And to the heat resistance of EGR valve
It can require relatively low, cost is relatively low；EGR valve arrangement is relatively easy.
To achieve the above object, the invention provides a kind of low pressure cold end egr system of engine, including：EGR is cooled down
Device, exhaust steam passage and cooling passage is respectively equipped with it, the inlet end of the exhaust steam passage and the row of diesel particulate filters
Tracheae connects, and is cooled down after waste gas is drawn from the blast pipe of diesel particulate filters by heat exchange method；EGR
Valve, its inlet end are connected with the outlet side of the cooler for recycled exhaust gas exhaust steam passage；EGR mixer, its exhaust gas entrance and the EGR
The upstream of the outlet side connection of valve, the air intake of EGR mixer and the compressor of booster connects；And controller, it collects
Into in Engine ECU, the aperture of the EGR valve is controlled for the operating condition according to engine and air inlet demand.
Preferably, in above-mentioned technical proposal, cooler for recycled exhaust gas is shell and tube cooler or strip-fin oil cooler.
Preferably, in above-mentioned technical proposal, check valve is additionally provided between cooler for recycled exhaust gas and EGR valve.
Preferably, in above-mentioned technical proposal, engine is gas machine.
Preferably, in above-mentioned technical proposal, EGR valve is made using casting aluminium material.
Compared with prior art, the present invention has the advantages that：The low pressure cold end egr system of the engine is from DPF
EGR exhaust is taken afterwards, is returned to before supercharger air compressor so that waste gas and fresh air are mixed well；Because EGR gives up
Gas is cooled down through charge air cooler and temperature after DPF is lower, obtains lower EGT, and cooler can be made smaller；And
The performance of booster is not reduced, and having reduces oil consumption potentiality.And relatively low is required to the heat resistance of EGR valve, cost is relatively low；EGR
Valve arrangement is relatively easy.
Brief description of the drawings
Fig. 1 is the structural representation of the low pressure cold end egr system of the engine of the present invention.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment of the present invention is described in detail, it is to be understood that the guarantor of the present invention
Shield scope is not limited by embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members
Part or other parts.
As shown in figure 1, it is to reduce engine according to the low pressure cold end egr system of the engine of the specific embodiment of the invention
Effective measures caused by NOx gases in cylinder, it is specifically included：EGR valve 1, cooler for recycled exhaust gas 2, EGR mixer (are not shown in figure
Go out) and controller.Waste gas takes out after DPF (diesel particulate filters) 3, returns to before supercharger air compressor, will start
Cylinder is sent in the part exhaust of machine back to again after cooling, participates in combustion process, the Main Ingredients and Appearance in waste gas be CO2,
Three H2O, N2 etc., wherein specific heat capacity higher atomic gas CO2 and H2O add the specific heat capacity of gaseous mixture in cylinder, and reducing can
Cylinder temperature before combustion gaseous mixture catches fire, has also declined combustion process temperature；Meanwhile gaseous mixture is oxygen-containing in cylinder after introducing EGR
Amount is reduced, and reduces burn rate and rate of heat release, this series of influence can effectively reduce the generation of NOx emission.Should
The low pressure cold end egr system of engine takes EGR exhaust after DPF, returns to before supercharger air compressor so that waste gas and fresh
Air is mixed well；Because EGR exhaust cools down and temperature after DPF is lower through charge air cooler, lower waste gas is obtained
Temperature, cooler can be made smaller；And the performance of booster is not reduced, having reduces oil consumption potentiality.And to the resistance to of EGR valve
Performance requirements are relatively low, and cost is relatively low；EGR valve arrangement is relatively easy.
Specifically, exhaust steam passage and cooling passage are respectively equipped with cooler for recycled exhaust gas 2, by introducing engine cool
Liquid, the waste gas for flowing through cooler for recycled exhaust gas is cooled down.Cooler for recycled exhaust gas cooling effectiveness directly affects the fresh sky into engine
The mixing temperature of gas and waste gas, good cooling effectiveness can effectively lift engine performance.The exhaust steam passage of cooler for recycled exhaust gas 2 enters
Gas end is connected with DPF (diesel particulate filters) 3 blast pipe, the exhaust by waste gas from DPF (diesel particulate filters) 3
After being drawn in pipe, engine is entered after being cooled to suitable temperature by heat exchange method.
The inlet end of EGR valve 1 is connected with the outlet side of the exhaust steam passage of cooler for recycled exhaust gas 2., can by adjusting the aperture of EGR valve
Realize and the EGR amount of engine is accurately controlled.According to the demand of different operating conditions, there is provided suitable exhausted air quantity participates in burned
Journey, realize the optimization of engine emission and performance.EGR valve type the carrying for DC motor Driver that Yuchai mainly uses at present
Lift valve, fast response time, two-stage can be realized by the position sensor of valve body and the air flow meter of vehicle gas handling system
Closed loop, response, stability and the followability of the control of vehicle running EGR valve is effectively ensured.Product possesses good durable
Property, possess automatically cleaning, self study and flexibility and the function such as take a seat.
Preferably, EGR valve 1 is made using casting aluminium material.
The exhaust gas entrance of EGR mixer is connected with the outlet side of EGR valve 1, air intake and the booster 4 of EGR mixer
Compressor upstream connection, waste gas is returned to before the compressor of booster 4, send engine after being mixed with fresh air back to again
Cylinder.
Preferably, cooler for recycled exhaust gas 2 is shell and tube cooler or strip-fin oil cooler.
Preferably, it is additionally provided with check valve between cooler for recycled exhaust gas 2 and EGR valve 1.
Controller is generally all integrated in Engine ECU, is drawn for controlling from the blast pipe before booster, through EGR
A certain amount of waste gas after cooler cooling is introduced into combustion chamber；ECU is according to the operating condition and air inlet need of present engine
The amount of asking controls the aperture of EGR valve, and waste gas participates in combustion process with entering after the fresh air of charge air cooler mixes in cylinder.EGR flow
Amount uses two level closed-loop control, and one-level closed-loop control is the position closed loop based on EGR valve position sensor, and two level closed-loop control is
Flow closed loop based on air flow meter, it can thereby realize accurate control of the engine full working scope scope to EGR flow.
Preferably, engine is gas machine, i.e., the high pressure cold end egr system by the way of cold end EGR valve arrangement is excellent
Select suitable gas machine.
To sum up, the low pressure cold end egr system of the engine takes EGR exhaust after DPF, return to supercharger air compressor it
Before so that waste gas and fresh air are mixed well；Due to EGR exhaust through charge air cooler cool down and temperature after DPF more
It is low, lower EGT is obtained, cooler can be made smaller；And the performance of booster is not reduced, having, which reduces oil consumption, dives
Power.And relatively low is required to the heat resistance of EGR valve, cost is relatively low；EGR valve arrangement is relatively easy.
The description of the foregoing specific illustrative embodiment to the present invention is to illustrate and the purpose of illustration.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can be much changed
And change.The purpose of selecting and describing the exemplary embodiment is that explain that the certain principles of the present invention and its reality should
With so that those skilled in the art can realize and utilize the present invention a variety of exemplaries and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (5)
- A kind of 1. low pressure cold end egr system of engine, it is characterised in that including：Cooler for recycled exhaust gas, exhaust steam passage and cooling passage are respectively equipped with it, inlet end and the diesel particulate thing of the exhaust steam passage The blast pipe connection of filter, is carried out after waste gas is drawn from the blast pipe of diesel particulate filters by heat exchange method Cooling；EGR valve, its inlet end are connected with the outlet side of the cooler for recycled exhaust gas exhaust steam passage；EGR mixer, its exhaust gas entrance are connected with the outlet side of the EGR valve, the air intake of EGR mixer and booster The upstream connection of compressor；AndController, it is integrated in Engine ECU, for the operating condition according to engine and air inlet demand control institute State the aperture of EGR valve.
- 2. the low pressure cold end egr system of engine according to claim 1, it is characterised in that the cooler for recycled exhaust gas is pipe Shell-type cooler or strip-fin oil cooler.
- 3. the low pressure cold end egr system of engine according to claim 1, it is characterised in that the cooler for recycled exhaust gas with Check valve is additionally provided between EGR valve.
- 4. the low pressure cold end egr system of engine according to claim 1, it is characterised in that the engine is gas Machine.
- 5. the low pressure cold end egr system of engine according to claim 1, it is characterised in that the EGR valve uses cast aluminium Material makes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711066440.7A CN107795412A (en) | 2017-11-02 | 2017-11-02 | The low pressure cold end egr system of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711066440.7A CN107795412A (en) | 2017-11-02 | 2017-11-02 | The low pressure cold end egr system of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107795412A true CN107795412A (en) | 2018-03-13 |
Family
ID=61548773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711066440.7A Pending CN107795412A (en) | 2017-11-02 | 2017-11-02 | The low pressure cold end egr system of engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107795412A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115059562A (en) * | 2022-05-25 | 2022-09-16 | 中国第一汽车股份有限公司 | EGR mixer, EGR system and control method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120144806A1 (en) * | 2010-12-10 | 2012-06-14 | Kabushiki Kaisha Toyota Jidoshokki | Internal combustion engine |
| CN102797595A (en) * | 2011-05-25 | 2012-11-28 | 广西玉柴机器股份有限公司 | Exhaust gas recirculation (EGR) system for diesel engine |
| US20120304640A1 (en) * | 2011-06-06 | 2012-12-06 | Nissan Motor Co., Ltd. | Exhaust gas recirculation system for an internal combustion engine |
| US20130291537A1 (en) * | 2010-11-10 | 2013-11-07 | Ihi Corporation | Low-pressure loop egr device |
| CN103541835A (en) * | 2013-09-30 | 2014-01-29 | 哈尔滨东安汽车发动机制造有限公司 | Turbocharged engine with cooling exhaust recirculation technology |
| CN106150770A (en) * | 2015-03-27 | 2016-11-23 | 北京汽车动力总成有限公司 | A kind of gas recirculation system and automobile |
| CN106837614A (en) * | 2017-01-22 | 2017-06-13 | 浙江吉利罗佑发动机有限公司 | A kind of low pressure exhaust gas recirculation control system and method |
| 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 |
-
2017
- 2017-11-02 CN CN201711066440.7A patent/CN107795412A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130291537A1 (en) * | 2010-11-10 | 2013-11-07 | Ihi Corporation | Low-pressure loop egr device |
| US20120144806A1 (en) * | 2010-12-10 | 2012-06-14 | Kabushiki Kaisha Toyota Jidoshokki | Internal combustion engine |
| CN102797595A (en) * | 2011-05-25 | 2012-11-28 | 广西玉柴机器股份有限公司 | Exhaust gas recirculation (EGR) system for diesel engine |
| US20120304640A1 (en) * | 2011-06-06 | 2012-12-06 | Nissan Motor Co., Ltd. | Exhaust gas recirculation system for an internal combustion engine |
| CN103541835A (en) * | 2013-09-30 | 2014-01-29 | 哈尔滨东安汽车发动机制造有限公司 | Turbocharged engine with cooling exhaust recirculation technology |
| CN106150770A (en) * | 2015-03-27 | 2016-11-23 | 北京汽车动力总成有限公司 | A kind of gas recirculation system and automobile |
| CN106837614A (en) * | 2017-01-22 | 2017-06-13 | 浙江吉利罗佑发动机有限公司 | A kind of low pressure exhaust gas recirculation control system and method |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115059562A (en) * | 2022-05-25 | 2022-09-16 | 中国第一汽车股份有限公司 | EGR mixer, EGR system and control method thereof |
| CN115059562B (en) * | 2022-05-25 | 2024-04-12 | 中国第一汽车股份有限公司 | EGR (exhaust gas recirculation) mixer, EGR system and control method of EGR system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6009709A (en) | System and method of controlling exhaust gas recirculation | |
| US6360732B1 (en) | Exhaust gas recirculation cooling system | |
| CN202300717U (en) | EGR (Exhaust Gas Recirculation) mixer for highly turbocharged engine system | |
| US8534047B2 (en) | Combustion engine breathing systems, components thereof and methods of operating and controlling the same | |
| US10082110B2 (en) | Mixer for dedicated exhaust gas recirculation systems | |
| US9032940B2 (en) | Systems and methods for dedicated exhaust gas recirculation and control | |
| US10247144B2 (en) | Engine exhaust gas recirculation cooling system with integrated latent heat storage device | |
| US6598396B2 (en) | Internal combustion engine EGR system utilizing stationary regenerators in a piston pumped boost cooled arrangement | |
| CN201747481U (en) | EGR system control device | |
| CN102588131B (en) | Diesel engine for vehicle and controlling method thereof | |
| KR20140024273A (en) | Engine arrangement with charge air cooler and egr system | |
| CN100436770C (en) | Arrangement for controlling exhaust pressure pulses at an internal combustion engine | |
| JP2008169712A (en) | Engine with egr system | |
| US9410504B2 (en) | Mixer for pulsed EGR | |
| US20050091977A1 (en) | Method and apparatus for exhaust gas recirculation cooling using a vortex tube to cool recirculated exhaust gases | |
| CN103114916A (en) | EGR (exhaust gas recirculation) control system | |
| CN109404120A (en) | The compression-ignited zero nitrogen discharged pure oxygen rotary engine of one kind and its control method | |
| CN101302973A (en) | Exhaust gas recirculation system of vehicle | |
| CN107795412A (en) | The low pressure cold end egr system of engine | |
| CN207686871U (en) | The high pressure cold end egr system of engine | |
| CN207673469U (en) | The low pressure hot junction egr system of engine | |
| CN206448886U (en) | Cooling system for recycled exhaust gas | |
| CN207673470U (en) | The low pressure cold end egr system of engine | |
| US20140373528A1 (en) | Fixed positive displacement egr system | |
| CN107859575A (en) | The low pressure hot junction egr system of engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180313 |