CN107859575A - The low pressure hot junction egr system of engine - Google Patents
The low pressure hot junction egr system of engine Download PDFInfo
- Publication number
- CN107859575A CN107859575A CN201711064827.9A CN201711064827A CN107859575A CN 107859575 A CN107859575 A CN 107859575A CN 201711064827 A CN201711064827 A CN 201711064827A CN 107859575 A CN107859575 A CN 107859575A
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- China
- Prior art keywords
- egr
- cooler
- engine
- low pressure
- hot junction
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- 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.)
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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
- F02D41/0052—Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount
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- 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
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- 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
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
- F02M26/16—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system with EGR valves located at or near the connection to the exhaust system
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The invention discloses a kind of low pressure hot junction egr system of engine.The low pressure hot junction egr system of the engine includes：The blast pipe connection of EGR valve, its inlet end and diesel particulate filters, takes waste gas after diesel particulate filters；Cooler for recycled exhaust gas, exhaust steam passage and cooling passage is respectively equipped with it, the inlet end of the exhaust steam passage is connected with the outlet side of the EGR valve；EGR mixer, its exhaust gas entrance are connected with the outlet side of the cooler for recycled exhaust gas exhaust steam passage, the upstream connection of the air intake of EGR mixer and the compressor of booster；And controller.The low pressure hot junction 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 hot junction 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 hot junction egr system of simple and reasonable engine, this starts
The low pressure hot junction 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 waste gas first through EGR valve again
Into cooler for recycled exhaust gas, EGR valve is arranged in blast pipe side, and the low-speed performance and acceleration on engine influence small；It is not easy to produce
The failures such as raw coking, carbon distribution.
To achieve the above object, the invention provides a kind of low pressure hot junction egr system of engine, including：EGR valve, its
The blast pipe of inlet end and diesel particulate filters is connected, and waste gas is taken after diesel particulate filters；Cooler for recycled exhaust gas,
Exhaust steam passage and cooling passage are respectively equipped with it, the inlet end of the exhaust steam passage is connected with the outlet side of the EGR valve；
EGR mixer, its exhaust gas entrance are connected with the outlet side of the cooler for recycled exhaust gas exhaust steam passage, the air intake of EGR mixer with
The upstream connection of the compressor of booster；And controller, it is integrated in Engine ECU, for the operation according to engine
Operating mode and air inlet demand control the aperture of the EGR valve.
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 EGR mixer and cooler for recycled exhaust gas.
Preferably, in above-mentioned technical proposal, engine is diesel engine.
Compared with prior art, the present invention has the advantages that：The low pressure hot junction 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 waste gas first enters back into cooler for recycled exhaust gas, EGR valve arrangement through EGR valve
In blast pipe side, low-speed performance and acceleration on engine influence small；Do not allow to be also easy to produce the failures such as coking, carbon distribution.
Brief description of the drawings
Fig. 1 is the structural representation of the low pressure hot junction 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 hot junction 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 EGR exhaust after the DPF (diesel particulate filters) 3, return to booster 4 compressor it
Before, send the part exhaust of engine back to cylinder again after cooling, participate in combustion process, the Main Ingredients and Appearance in waste gas
It is CO2, H2O, N2 etc., wherein three higher atomic gas CO2 and H2O of specific heat capacity add the specific heat capacity of gaseous mixture in cylinder, drop
Cylinder temperature before low combustion mixture catches fire, has also declined combustion process temperature；Meanwhile introduce the interior mixing of cylinder after EGR
Gas oxygen content is reduced, and reduces burn rate and rate of heat release, this series of influence can effectively reduce the life of NOx emission
Into.The low pressure hot junction egr system of the engine takes EGR exhaust after DPF (diesel particulate filters), returns to booster pressure
Before mechanism of qi so that waste gas and fresh air are mixed well；Because EGR exhaust cools down through charge air cooler and after DPF
Temperature is lower, obtains lower EGT, and cooler can be made smaller；And the performance of booster is not reduced, there is reduction
Oil consumption potentiality.And waste gas first enters back into cooler for recycled exhaust gas through EGR valve, EGR valve is arranged in blast pipe side, to the low speed of engine
Performance and acceleration influence small；Do not allow to be also easy to produce the failures such as coking, carbon distribution.
Specifically, the inlet end of EGR valve 1 is connected with DPF (diesel particulate filters) 3 blast pipe, from DPF (bavins
Oil particles thing filter) EGR exhaust is taken after 3.By adjusting the aperture of EGR valve, can be achieved accurately to control the EGR amount of engine
System.According to the demand of different operating conditions, there is provided suitable exhausted air quantity participates in combustion process, realizes engine emission and performance
Optimize.The EGR valve type that Yuchai mainly uses at present fast response time, passes through valve body for the poppet of DC motor Driver
Position sensor and the air flow meter of vehicle gas handling system can realize two-stage closed loop, vehicle running is effectively ensured
Response, stability and the followability of EGR valve control.Product possesses good durability, possesses automatically cleaning, self study and soft
Property such as is taken a seat at the function.
Exhaust steam passage and cooling passage are respectively equipped with cooler for recycled exhaust gas 2, by introducing engine coolant, to flowing through
The waste gas of cooler for recycled exhaust gas is cooled down.Cooler for recycled exhaust gas cooling effectiveness directly affects the fresh air and waste gas into engine
Mixing temperature, good cooling effectiveness can effectively lift engine performance.The inlet end and EGR valve of the exhaust steam passage of cooler for recycled exhaust gas 2
1 outlet side connection, after waste gas is drawn from the blast pipe before the turbine of booster 4, conjunction is cooled to by heat exchange method
Engine is entered after suitable temperature.
The exhaust gas entrance of EGR mixer is connected with the outlet side of the exhaust steam passage of cooler for recycled exhaust gas 2, and the air of EGR mixer enters
Mouth is connected with the upstream of the compressor of booster 4, waste gas is returned to before the compressor of booster 4, after being mixed with fresh air
Send cylinder back to again.
Preferably, cooler for recycled exhaust gas 2 is shell and tube cooler or strip-fin oil cooler.
Preferably, check valve is additionally provided between EGR mixer and cooler for recycled exhaust gas.
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 diesel engine, i.e., the high pressure hot junction egr system by the way of hot junction EGR valve arrangement is excellent
Choosing is applicable diesel engine.
To sum up, the low pressure hot junction 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 waste gas first enters back into cooler for recycled exhaust gas through EGR valve, EGR valve is arranged in blast pipe side, low-speed performance to engine and
Acceleration influences small；Do not allow to be also easy to produce the failures such as coking, carbon distribution.
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 (4)
- A kind of 1. low pressure hot junction egr system of engine, it is characterised in that including：The blast pipe connection of EGR valve, its inlet end and diesel particulate filters, takes useless after diesel particulate filters Gas；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 EGR valve Outlet side connection；EGR mixer, its exhaust gas entrance are connected with the outlet side of the cooler for recycled exhaust gas exhaust steam passage, and the air of EGR mixer enters Mouth is connected with the upstream of the compressor of booster；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 hot junction 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 hot junction egr system of engine according to claim 1, it is characterised in that the EGR mixer with Check valve is additionally provided between cooler for recycled exhaust gas.
- 4. the low pressure hot junction egr system of engine according to claim 1, it is characterised in that the engine is diesel oil Machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711064827.9A CN107859575A (en) | 2017-11-02 | 2017-11-02 | The low pressure hot junction egr system of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711064827.9A CN107859575A (en) | 2017-11-02 | 2017-11-02 | The low pressure hot junction egr system of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107859575A true CN107859575A (en) | 2018-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711064827.9A Pending CN107859575A (en) | 2017-11-02 | 2017-11-02 | The low pressure hot junction egr system of engine |
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| Country | Link |
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| CN (1) | CN107859575A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963293A (en) * | 2020-07-23 | 2020-11-20 | 广西玉柴机器股份有限公司 | High-efficient thoughtlessly moves engine cooling system |
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| WO2008143670A1 (en) * | 2007-05-21 | 2008-11-27 | Borgwarner Inc. | Combustion engine breathing systems, components thereof and methods of operating and controlling the same |
| US20110132337A1 (en) * | 2010-02-16 | 2011-06-09 | Ford Global Technologies, Llc | Exhaust treatment system for 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 |
| CN207673469U (en) * | 2017-11-02 | 2018-07-31 | 广西玉柴机器股份有限公司 | The low pressure hot junction egr system of engine |
-
2017
- 2017-11-02 CN CN201711064827.9A patent/CN107859575A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008143670A1 (en) * | 2007-05-21 | 2008-11-27 | Borgwarner Inc. | Combustion engine breathing systems, components thereof and methods of operating and controlling the same |
| US20110132337A1 (en) * | 2010-02-16 | 2011-06-09 | Ford Global Technologies, Llc | Exhaust treatment system for 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 |
| CN207673469U (en) * | 2017-11-02 | 2018-07-31 | 广西玉柴机器股份有限公司 | The low pressure hot junction egr system of engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963293A (en) * | 2020-07-23 | 2020-11-20 | 广西玉柴机器股份有限公司 | High-efficient thoughtlessly moves engine cooling system |
| CN111963293B (en) * | 2020-07-23 | 2024-05-10 | 广西玉柴机器股份有限公司 | Control method of efficient hybrid engine cooling system |
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Application publication date: 20180330 |
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