CN208364262U - The measurement pipeline of engine EGR exhaust gas flow based on closed-loop control - Google Patents
The measurement pipeline of engine EGR exhaust gas flow based on closed-loop control Download PDFInfo
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- CN208364262U CN208364262U CN201821043999.8U CN201821043999U CN208364262U CN 208364262 U CN208364262 U CN 208364262U CN 201821043999 U CN201821043999 U CN 201821043999U CN 208364262 U CN208364262 U CN 208364262U
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- exhaust gas
- egr
- gas flow
- engine
- venturi tube
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Abstract
The utility model discloses a kind of, and the engine EGR exhaust gas flow based on closed-loop control measures pipeline, it is arranged between the exhaust pipe of engine and air inlet pipe, the air inlet that engine EGR exhaust gas flow measures pipeline is arranged on exhaust pipe, for carrying out taking gas directly on exhaust pipe, it includes: cooler for recycled exhaust gas that engine EGR exhaust gas flow, which measures pipeline, it is arranged in air inlet rear, so that cooling down by cooler for recycled exhaust gas to EGR exhaust after taking gas；Metal bellows is arranged in the rear of cooler for recycled exhaust gas, for absorbing a part vibration of engine EGR exhaust gas flow measurement pipeline；And EGR valve, Venturi tube and/or stress impairs device, it is arranged in the rear of metal bellows, EGR exhaust is able to enter in air inlet pipe after EGR valve, Venturi tube and/or stress impairs device.The engine EGR exhaust gas flow measurement pipeline of the utility model can significantly improve the precision of Venturi measuring.
Description
Technical field
The utility model is the measurement pipeline about a kind of engine EGR exhaust gas flow, is based on closing especially with regard to one kind
The measurement pipeline of the engine EGR exhaust gas flow of ring control.
Background technique
As engine emission regulation is increasingly stringenter, the requirement to engine technology is also higher and higher, especially for
New emission regulation is coped with, engine has used EGR Technology (EGR).And EGR rate directly affects engine
The operating condition of performance and discharge, engine is different, and the requirement to EGR amount is also different.In order to enable egr system more effectively to play work
With, it is necessary to closed-loop control is subject to exhaust gas flow.Therefore, the control of EGR rate just becomes key factor, and EGR rate control
Accuracy is again closely related with the accuracy of EGR flow measurement.Venturi tube is a kind of common closed-loop control on the engine
Measurement EGR flow device, it is poor by measuring static pressure at two measuring points, with continuity equation and Bernoulli's theorem
Find out flow.It is Venturi tube to the Venturi tube requirement in engine EGR pipeline under engine operation condition
The influence that the pressure difference that two measuring points are measured cannot be fluctuated excessively by pressure at expulsion, accurately measure due to EGR flow
Pressure difference caused by amount.It is specifically presented as, is designed preferable EGR flow measurement pipeline, is provided in Venturi tube upstream
The device for correspondingly weakening pressure oscillation, so that the pressure oscillation at venturi tube inlet is smaller.
However, the existing pipeline for measuring engine EGR flow using Venturi tube, only considers pipe in arrangement
The feasibility of road arrangement, the difference for not fully taking into account some device positions on pipeline but will cause the survey of Venturi tube
Measure the difference by pressure at expulsion fluctuation effect.The arrangement of existing measurement pipeline, is usually arranged in venturi for EGR valve
The downstream of pipe, and Venturi tube downstream do not weaken pressure at expulsion fluctuation device, so as to cause Venturi measuring have compared with
Big deviation.
The information disclosed in the background technology section is intended only 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 is already known to those of ordinary skill in the art existing
Technology.
Utility model content
The purpose of this utility model is to provide a kind of, and the engine EGR exhaust gas flow based on closed-loop control measures pipeline,
Its precision that can significantly improve Venturi measuring.
To achieve the above object, the utility model provides a kind of engine EGR waste gas stream measurement based on closed-loop control
Buret road, engine EGR exhaust gas flow measurement pipeline are arranged between the exhaust pipe of engine and air inlet pipe, engine EGR
The air inlet that exhaust gas flow measures pipeline is arranged on exhaust pipe, takes gas for carrying out directly on exhaust pipe, engine EGR is useless
It includes: cooler for recycled exhaust gas that throughput, which measures pipeline, air inlet rear is arranged in, so that by cooler for recycled exhaust gas pair after taking gas
EGR exhaust is cooled down；Metal bellows is arranged in the rear of cooler for recycled exhaust gas, for absorbing engine EGR exhaust gas flow
Measure a part vibration of pipeline；Venturi tube is set to the rear of metal bellows, and EGR exhaust is after Venturi tube
It is able to enter in air inlet pipe；And EGR valve, it is arranged in Venturi tube.
In a preferred embodiment, EGR valve is arranged in the rear of the metal bellows, and EGR valve is arranged in text
The upstream position of venturi.
In a preferred embodiment, the rear of metal bellows there also is provided stress impairs device.
In a preferred embodiment, wherein EGR valve is arranged in the downstream position of Venturi tube, and stress impairs
Device is arranged in the upstream position of Venturi tube.
In a preferred embodiment, wherein EGR valve is arranged in the upstream position of Venturi tube, while in Wen Qiu
In pipe upstream position arrange stress impairs device.
In a preferred embodiment, the rear of EGR valve is arranged in stress impairs device.
In a preferred embodiment, the front of EGR valve is arranged in stress impairs device.
In a preferred embodiment, the outlet of Venturi tube is connected by EGR mixer with air inlet pipe, so that
EGR exhaust can mix under the action of EGR mixer with FAI Fresh Air Intake.
Compared with prior art, engine EGR exhaust gas flow according to the present utility model measures pipeline: using high pressure
EGR, i.e., directly take exhaust gas on exhaust pipe, and the upstream of Venturi tube must have the device that can weaken pressure at expulsion fluctuation, can be with
It is EGR valve or stress impairs device.The measurement pipeline of the utility model has fully considered pressure at expulsion fluctuation pair in arrangement
The influence of Venturi measuring has the device for weakening pressure at expulsion fluctuation in the upstream arrangement of Venturi tube, reduces venturi
The pressure oscillation of tube inlet position significantly improves the accurate of Venturi measuring.By adjusting EGR valve, Venturi tube and/or
The position of stress impairs device, while the accurate relationship between pipe resistance of measurement is considered, and can be according to different
Demand is selected.
Detailed description of the invention
Fig. 1 is that the signal of pipeline stereochemical structure is measured according to the engine EGR exhaust gas flow of one embodiment of the utility model
Figure.
Fig. 2 is to measure pipeline main view according to the engine EGR exhaust gas flow of one embodiment of the utility model.
Fig. 3 is the right view that pipeline is measured according to the engine EGR exhaust gas flow of one embodiment of the utility model.
Main appended drawing reference explanation:
1- engine EGR exhaust gas flow measures pipeline, 11-EGR cooler, 12- metal bellows, 13-EGR valve, 14- text
Venturi, 15- stress impairs device, 2- exhaust pipe, 3- air inlet pipe, 4-EGR mixer.
Specific embodiment
With reference to the accompanying drawing, specific embodiment of the present utility model is described in detail, it is to be understood that this is practical
Novel protection scope is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
As shown in Figure 1 to Figure 3, according to the engine EGR exhaust gas flow measurement pipe of one preferred embodiment of the utility model
Road 1 is arranged between the exhaust pipe 2 of engine and air inlet pipe 3, and engine EGR exhaust gas flow measures the air inlet setting of pipeline 1
On exhaust pipe 2, gas is taken for directly carrying out on exhaust pipe 2.It includes: EGR cold that engine EGR exhaust gas flow, which measures pipeline 1,
But device 11, metal bellows 12, EGR valve 13 and Venturi tube 14.
Wherein, cooler for recycled exhaust gas 11 is arranged in air inlet rear, so that by cooler for recycled exhaust gas 11 to EGR exhaust after taking gas
It is cooled down.Metal bellows 12 is arranged in the rear of cooler for recycled exhaust gas 11, for absorbing engine EGR exhaust gas flow measurement pipe
A part vibration on road 1.Venturi tube 14 is set to the rear of metal bellows 12, EGR exhaust energy after Venturi tube 14
Enough enter in air inlet pipe 3.EGR valve 13 is arranged in Venturi tube 14.
In above scheme, engine EGR exhaust gas flow measurement pipeline 1 there also is provided stress impairs device 15.Wherein, EGR
Valve 13 is arranged in the upstream position of Venturi tube 14, while arranging stress impairs device in the upstream position of Venturi tube 14
15.In this arrangement, the position of EGR valve 13 and stress impairs device 15 be can be interchanged, and stress impairs device 15 can be set
It sets in the front (as shown in Figure 1) of EGR valve 13, stress impairs device 15 also can be set at the rear of EGR valve 13.This kind arrangement
The measurement accuracy highest of mode, the resistance for measuring pipeline are relatively large.Pressure sensor 5 is additionally provided in Venturi tube 14.Text
The outlet of venturi 14 is connected by EGR mixer 4 with air inlet pipe 3, so that EGR exhaust energy under the action of EGR mixer 4
It is enough to be mixed with FAI Fresh Air Intake.
In a preferred embodiment, the rear of metal bellows is disposed with EGR valve, Venturi tube and stress impairs dress
It sets.Wherein, EGR valve is arranged in the downstream position of Venturi tube, and stress impairs device is arranged in the upstream position of Venturi tube
Set place.The measurement accuracy of this kind of arrangement depends on stress impairs device to the weakening degree of pressure oscillation, but the measurement pipe
The resistance on road is relatively large (suitable with the resistance of above-mentioned arrangement).
In a preferred embodiment, the rear of metal bellows is only disposed with EGR valve and Venturi tube, wherein EGR
Valve is arranged in the rear of metal bellows, and EGR valve is arranged in the upstream position of Venturi tube.This kind measures pipeline arrangement side
The measurement of the Venturi tube of formula is not only able to satisfy engine request, but also is unlikely to that pipeline is made to generate excessive resistance, while improving survey
Accuracy of measurement.
The upstream of the Venturi tube of measurement pipeline of the invention must have the device that can weaken pressure at expulsion fluctuation, can be
Other stress impairs devices that can reduce pressure oscillation such as EGR valve either pressure maintaining valve, throttle valve.Measure the metal wave of pipeline
Line pipe is substantially at the middle position of whole section of EGR exhaust measurement pipeline, reduces whole section of EGR exhaust flow tube to play
The effect of road vibration.
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
It is many to change and change.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 be realized 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 (8)
1. a kind of engine EGR exhaust gas flow based on closed-loop control measures pipeline, the engine EGR exhaust gas flow measurement pipe
Road is arranged between the exhaust pipe of engine and air inlet pipe, which is characterized in that the engine EGR exhaust gas flow measurement pipeline
Air inlet is arranged on the exhaust pipe, takes gas, the engine EGR exhaust gas flow for directly carrying out on the exhaust pipe
Measuring pipeline includes:
Cooler for recycled exhaust gas is arranged in the air inlet rear so that after taking gas by the cooler for recycled exhaust gas to EGR exhaust into
Row cooling；
Metal bellows is arranged in the rear of the cooler for recycled exhaust gas, for absorbing the engine EGR exhaust gas flow measurement
A part vibration of pipeline；
Venturi tube, is set to the rear of the metal bellows, and EGR exhaust is able to enter institute after the Venturi tube
It states in air inlet pipe；And
EGR valve is arranged in the Venturi tube.
2. engine EGR exhaust gas flow as described in claim 1 measures pipeline, which is characterized in that the EGR valve is arranged in institute
The rear of metal bellows is stated, and the EGR valve is arranged in the upstream position of the Venturi tube.
3. engine EGR exhaust gas flow as described in claim 1 measures pipeline, which is characterized in that the metal bellows
Rear there also is provided stress impairs device.
4. engine EGR exhaust gas flow as claimed in claim 3 measures pipeline, which is characterized in that wherein, the EGR valve cloth
The downstream position in the Venturi tube is set, and the stress impairs device is arranged in the upstream position of the Venturi tube
Place.
5. engine EGR exhaust gas flow as claimed in claim 3 measures pipeline, which is characterized in that wherein, the EGR valve cloth
The upstream position in the Venturi tube is set, while arranging the stress impairs dress in the upstream position of the Venturi tube
It sets.
6. engine EGR exhaust gas flow as claimed in claim 5 measures pipeline, which is characterized in that the stress impairs device
The rear of the EGR valve is set.
7. engine EGR exhaust gas flow as claimed in claim 5 measures pipeline, which is characterized in that the stress impairs device
The front of the EGR valve is set.
8. engine EGR exhaust gas flow as described in claim 1 measures pipeline, which is characterized in that the Venturi tube goes out
Mouth is connected by EGR mixer with the air inlet pipe, so that the EGR exhaust can under the action of the EGR mixer
It is mixed with FAI Fresh Air Intake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821043999.8U CN208364262U (en) | 2018-07-03 | 2018-07-03 | The measurement pipeline of engine EGR exhaust gas flow based on closed-loop control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821043999.8U CN208364262U (en) | 2018-07-03 | 2018-07-03 | The measurement pipeline of engine EGR exhaust gas flow based on closed-loop control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208364262U true CN208364262U (en) | 2019-01-11 |
Family
ID=64924389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821043999.8U Active CN208364262U (en) | 2018-07-03 | 2018-07-03 | The measurement pipeline of engine EGR exhaust gas flow based on closed-loop control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208364262U (en) |
-
2018
- 2018-07-03 CN CN201821043999.8U patent/CN208364262U/en active Active
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