CN207686871U - The high pressure cold end egr system of engine - Google Patents
The high pressure cold end egr system of engine Download PDFInfo
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- CN207686871U CN207686871U CN201721447437.5U CN201721447437U CN207686871U CN 207686871 U CN207686871 U CN 207686871U CN 201721447437 U CN201721447437 U CN 201721447437U CN 207686871 U CN207686871 U CN 207686871U
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- egr
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- cooler
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Abstract
The utility model discloses a kind of high pressure cold end egr systems of engine.The high pressure cold end egr system of the engine includes：Cooler for recycled exhaust gas is inside respectively equipped with exhaust steam passage and cooling passage, and the exhaust pipe connection before the inlet end of the exhaust steam passage and the turbine of booster cools down exhaust gas after being drawn in the exhaust pipe before the turbine of booster by heat exchange method；EGR valve, inlet end are connect with the outlet side of the cooler for recycled exhaust gas exhaust steam passage；EGR mixer, exhaust gas entrance are connect with the outlet side of the EGR valve, and the air intake of EGR mixer is connect with engine aspirating system；And controller.The high pressure cold end egr system of the engine has relatively small number of connecting line, is not polluted to charge air cooler and booster, the variation of exhaust back pressure does not directly influence EGR exhaust flow, and transient response is good.And it is relatively low to the requirement of the heat resistance of EGR valve, cost is relatively low；EGR valve arrangement is relatively easy.
Description
Technical field
The utility model is related to engine art, more particularly to the high pressure cold end egr system of a kind of engine.
Background technology
Exhaust gas recycling (EGR, Exhaust Gas Recirculation) is the NOx gases production reduced in engine cylinder
Raw effective measures, the system are mainly made of EGR valve, cooler for recycled exhaust gas, check valve (optional), connecting line and controller.Its
Operation principle is：It sends the part exhaust of diesel engine back to cylinder again after cooling, participates in combustion process, in exhaust gas
Main ingredient is CO2, H2O, N2 etc., and the wherein higher three atomic gas CO2 and H2O of specific heat capacity increases the ratio of gaseous mixture in cylinder
Thermal capacitance reduces cylinder temperature before combustion mixture catches fire, also combustion process temperature is made to be declined；Meanwhile introducing cylinder after EGR
Interior gaseous mixture oxygen content is reduced, and so that burn rate and rate of heat release is reduced, this series of influence can effectively reduce NOx emission
The generation of object.
It is divided into internal EGR and outside EGR from structure.So-called internal EGR is exactly to allow a part of exhaust gas that cylinder is not discharged,
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 external EGR, the utility model is primarily adapted for use in the design of external EGR.
Existing External EGR systems use low pressure EGR, its exhaust gas of the low pressure EGR system generally to take EGR exhaust after DPF,
It returns to before supercharger air compressor.The shortcomings that low pressure EGR system, is：1, connecting line is more, and needs exhaust throttle
Valve come control exhaust gas flowing pressure difference.If 2, not filling particulate filter, it is easy to pollute charge air cooler and booster, causes
Damage.3, the variation of exhaust back pressure directly influences EGR exhaust flow, and transient response is poor.
The information for being disclosed in the background technology part is merely intended to increase the understanding to the general background of the utility model, and
It is not construed as recognizing or implying in any form that information composition has been existing well known to persons skilled in the art
Technology.
Utility model content
The purpose of this utility model is to provide a kind of high pressure cold end egr systems of simple and reasonable engine, should
The exhaust gas of the high pressure cold end egr system of engine is drawn from the exhaust pipe before booster turbine, and exhaust gas is first through cooler for recycled exhaust gas
EGR valve is entered back into after cooling, and there is relatively small number of connecting line, charge air cooler and booster are not polluted, the exhaust back of the body
The variation of pressure does not directly influence EGR exhaust flow, and transient response is good.And it is relatively low to the requirement of the heat resistance of EGR valve,
Cost is relatively low；EGR valve arrangement is relatively easy.
To achieve the above object, the utility model provides a kind of high pressure cold end egr system of engine, including：EGR is cold
But device is inside respectively equipped with exhaust steam passage and cooling passage, the row before the inlet end of the exhaust steam passage and the turbine of booster
Tracheae connects, and exhaust gas is cooled down after being drawn in the exhaust pipe before the turbine of booster by heat exchange method；EGR valve,
Its inlet end is connect with the outlet side of the cooler for recycled exhaust gas exhaust steam passage；EGR mixer, exhaust gas entrance and the EGR valve
Outlet side connects, and the air intake of EGR mixer is connect with engine aspirating system；And controller, it is integrated in engine
In ECU, the aperture for controlling the EGR valve according to the operating condition and air inlet demand of engine.
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, the air intake of EGR mixer and the charge air cooler downstream of engine aspirating system
Connection.
Preferably, in above-mentioned technical proposal, EGR valve is made of casting aluminium material.
Compared with prior art, the utility model has the advantages that：The high pressure cold end egr system of the engine
Exhaust gas is drawn from the exhaust pipe before booster turbine, and exhaust gas first enters back into EGR valve after cooler for recycled exhaust gas cools down, and has phase
To less connecting line, charge air cooler and booster are not polluted, the variation of exhaust back pressure does not directly influence EGR
Exhaust gas flow, transient response are good.And it is relatively low to the requirement of the heat resistance of EGR valve, cost is relatively low；EGR valve arrangement is opposite to be held
Easily.
Description of the drawings
Fig. 1 is the structural schematic diagram of the high pressure cold end egr system of the engine of the utility model.
Specific implementation mode
Below in conjunction with the accompanying drawings, specific embodiment of the present utility model is described in detail, it is to be understood that this practicality
Novel protection domain is not restricted by specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " comprising " or its change
It changes such as "comprising" or " including " etc. and will be understood to comprise stated element or component, and do not exclude other members
Part or other component parts.
As shown in Figure 1, being to reduce hair according to the high pressure cold end egr system of the engine of specific embodiment of the present invention
The effective measures that NOx gases in engine cylinder generate, specifically include：EGR valve 1, cooler for recycled exhaust gas 2, EGR mixer are (in figure not
Show) and controller.Exhaust gas is drawn from the exhaust pipe before the turbine of booster 4, is returned to after the compressor of booster 4, will
Cylinder is sent in the part exhaust of engine back to again after cooling, participates in combustion process, and the main ingredient in exhaust gas is
The higher three atomic gas CO2 and H2O of CO2, H2O, N2 etc., wherein specific heat capacity increases the specific heat capacity of gaseous mixture in cylinder, reduces
Cylinder temperature before combustion mixture catches fire, also makes combustion process temperature be declined；Meanwhile introducing after EGR gaseous mixture in cylinder
Oxygen content is reduced, and so that burn rate and rate of heat release is reduced, this series of influence can effectively reduce the life of NOx emission
At.The high pressure cold end egr system of the engine has relatively small number of connecting line, is not caused to charge air cooler 5 and booster 4
Pollution, the variation of exhaust back pressure do not directly influence EGR exhaust flow, and transient response is good.And exhaust gas is first cooled down through EGR
EGR valve is entered back into after device cooling, relatively low to the heat resistance requirement of EGR valve, cost is relatively low；EGR valve arrangement is relatively easy.
Specifically, it is respectively equipped with exhaust steam passage and cooling passage in cooler for recycled exhaust gas 2, by introducing engine cool
Liquid, the exhaust gas to flowing through cooler for recycled exhaust gas cool down.Cooler for recycled exhaust gas cooling efficiency directly affects the fresh sky into engine
The mixing temperature of gas and exhaust gas, good cooling efficiency can effectively promote engine performance.2 exhaust steam passage of cooler for recycled exhaust gas into
Gas end is connect with the exhaust pipe before the turbine of booster 4, by exhaust gas after being drawn in the exhaust pipe before the turbine of booster 4, is led to
It crosses after heat exchange method is cooled to suitable temperature and enters engine.
The inlet end of EGR valve 1 is connect with the outlet side of 2 exhaust steam passage of cooler for recycled exhaust gas.It, can by adjusting the aperture of EGR valve
Realization accurately controls the EGR amount of engine.According to the demand of different operating conditions, it is burned to provide suitable exhausted air quantity participation
Journey realizes the optimization of engine emission and performance.The EGR valve type that Yuchai mainly uses at present carries for what direct current generator drove
Lift valve, fast response time can realize two-stage by the position sensor of valve body and the air flow meter of vehicle gas handling system
Response, stability and the followability of the control of vehicle operational process EGR valve is effectively ensured in closed loop.Product possesses good durable
Property has automatically cleaning, self study and flexibility and the functions such as takes a seat.
Preferably, EGR valve 1 is made of casting aluminium material.
The exhaust gas entrance of EGR mixer is connect with the outlet side of EGR valve 1, the air intake of EGR mixer and engine into
The charge air cooler downstream of gas system connects, and exhaust gas after being drawn in the exhaust pipe before the turbine of booster 4 and is returned to booster 4
After compressor, cylinder is sent back to again with after the fresh air of charge air cooler mixes.
Preferably, cooler for recycled exhaust gas 2 is shell and tube cooler or strip-fin oil cooler.
Preferably, check valve 6 is additionally provided between cooler for recycled exhaust gas 2 and EGR valve 1.
Controller is usually all integrated in Engine ECU, is drawn from the exhaust pipe before booster for controlling, through EGR
Cooler a certain amount of exhaust gas after 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, exhaust gas with after the fresh air of charge air cooler mixes into participating in combustion process in cylinder.EGR flow
It is the position closed loop based on EGR valve position sensor that amount, which uses two level closed-loop control, level-one closed-loop control, and two level closed-loop control is
Flow closed loop based on air flow meter can thereby realize that engine full working scope range accurately controls 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 exhaust gas of the high pressure cold end egr system of the engine is drawn from the exhaust pipe before booster turbine, and useless
Gas first enters back into EGR valve after cooler for recycled exhaust gas cools down, and has relatively small number of connecting line, does not have to charge air cooler and booster
It pollutes, the variation of exhaust back pressure does not directly influence EGR exhaust flow, and transient response is good.And to the resistance to of EGR valve
Performance requirements are relatively low, and cost is relatively low；EGR valve arrangement is relatively easy.
The description of the aforementioned specific exemplary embodiment to the utility model is in order to illustrate and illustration purpose.These
Description is not wishing to for the utility model to be limited to disclosed precise forms, and it will be apparent that according to the above instruction, can carry out
Many change and variations.The purpose of selecting and describing the exemplary embodiment is that explaining the specific principle of the utility model
And its practical application, so that those skilled in the art can realize and utilize a variety of different examples of the utility model
Property embodiment and various chooses and changes.The scope of the utility model is intended to by claims and its waits similar shapes
Formula is limited.
Claims (6)
1. a kind of high pressure cold end egr system of engine, which is characterized in that including：
Cooler for recycled exhaust gas is inside respectively equipped with exhaust steam passage and cooling passage, the inlet end of the exhaust steam passage and the whirlpool of booster
Exhaust pipe connection before wheel is carried out by heat exchange method exhaust gas after being drawn in the exhaust pipe before the turbine of booster cold
But；
EGR valve, inlet end are connect with the outlet side of the cooler for recycled exhaust gas exhaust steam passage；
EGR mixer, exhaust gas entrance are connect with the outlet side of the EGR valve, the air intake of EGR mixer and engine into
Gas system connects；And
Controller is integrated in Engine ECU, for controlling institute according to the operating condition and air inlet demand of engine
State the aperture of EGR valve.
2. the high pressure cold end egr system of engine according to claim 1, which is characterized in that the cooler for recycled exhaust gas is pipe
Shell-type cooler or strip-fin oil cooler.
3. the high pressure cold end egr system of engine according to claim 1, which is characterized in that the cooler for recycled exhaust gas with
Check valve is additionally provided between EGR valve.
4. the high pressure cold end egr system of engine according to claim 1, which is characterized in that the engine is gas
Machine.
5. the high pressure cold end egr system of engine according to claim 1, which is characterized in that the sky of the EGR mixer
The charge air cooler downstream of gas entrance and engine aspirating system connects.
6. the high pressure cold end egr system of engine according to claim 1, which is characterized in that the EGR valve uses cast aluminium
Material makes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721447437.5U CN207686871U (en) | 2017-11-02 | 2017-11-02 | The high pressure cold end egr system of engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721447437.5U CN207686871U (en) | 2017-11-02 | 2017-11-02 | The high pressure cold end egr system of engine |
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| Publication Number | Publication Date |
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| CN207686871U true CN207686871U (en) | 2018-08-03 |
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| CN201721447437.5U Active CN207686871U (en) | 2017-11-02 | 2017-11-02 | The high pressure cold end egr system of engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404172A (en) * | 2018-10-18 | 2019-03-01 | 奇瑞汽车股份有限公司 | A kind of gasoline engine combustion system based on high pressure EGR |
-
2017
- 2017-11-02 CN CN201721447437.5U patent/CN207686871U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404172A (en) * | 2018-10-18 | 2019-03-01 | 奇瑞汽车股份有限公司 | A kind of gasoline engine combustion system based on high pressure EGR |
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