CN107328893A - Gas buffer for improving measurement accuracy of NOx of engine - Google Patents
Gas buffer for improving measurement accuracy of NOx of engine Download PDFInfo
- Publication number
- CN107328893A CN107328893A CN201710487402.2A CN201710487402A CN107328893A CN 107328893 A CN107328893 A CN 107328893A CN 201710487402 A CN201710487402 A CN 201710487402A CN 107328893 A CN107328893 A CN 107328893A
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- Prior art keywords
- chamber
- engine
- measurement
- nox
- gas cushion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0037—NOx
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model provides a gas buffer for improving engine NOx measurement accuracy, this gas buffer dress welds in engine exhaust pipe (1), and it includes measurement chamber (2) and sampling tube (3) of lower part on upper portion, measurement chamber (2) top welding on engine exhaust pipe (1), measure chamber (2) cavity and cooperate with NOx sensor (5), NOx sensor (5) measuring head is installed in measuring chamber (2), sampling tube (3) top with measure chamber (2) and communicate with each other and with measure chamber (2) bottom and weld, sampling tube (3) inside is gaseous cushion chamber, is provided with a plurality of thief hole (4) on sampling tube (3). The measurement accuracy of the NOx is improved.
Description
Technical field
The present invention relates to a kind of gas cushion, it is used to improve engine NOx measurement accuracy more specifically to one kind
Gas cushion, belong to automobile and parts manufacturing technology field.
Background technology
The atomization of urea is uneven and the escaping of ammonia is to cause NOx sensor to measure inaccurate principal element.Single vehicle is opened
During hair, NOx measured value can be made to be consistent with actual value by correction coefficient when post-processing data scaling, so as to realize OBD
Warning function.But, because OBD monitoring nominal datas are the measurement data based on stand emission analyzer, wherein stand is discharged
Analyzer is then measured by probe tube sampling；And after-treatment system NOx sensor is the method for direct sample emission measuring, because
The difference of this metering system will cause both NOx measurement results to there is deviation (measured deviation reaches ± 15%), and can cause OBD
The input of the risk that monitoring system occurs failing to report or reported by mistake, influence engine research, development and new product in market.Meanwhile, work as engine
When being loaded in different vehicles, now after-treatment system catalyst converter product design difference (catalyst converter gas vent structure change),
NOx sensor measurement scattered error is bigger, the risk that can further have OBD wrong reports with a set of post processing demarcation covering.
The content of the invention
The present invention for existing NOx sensor measure it is inaccurate, there are problems that OBD wrong reports there is provided one kind
Gas cushion for improving engine NOx measurement accuracy.
To achieve the above object, technical solution of the invention is：It is a kind of to be used to improve engine NOx measurement accuracy
Gas cushion, the gas cushion welding equipment is in the exhaust pipe of engine) in, its measurement chamber for including top and the sampling of bottom
Pipe, described measurement top of chamber is welded on the exhaust pipe of engine, and measurement chamber cavity is engaged with NOx sensor, NOx sensor
Measurement head is arranged on measurement intracavitary, and described probe tube top communicates with measurement chamber and mutually welded with measurement bottom of chamber portion, probe tube
Inside is to be provided with several thief holes on gas buffer chamber, probe tube.
Described sampling thickness of pipe wall is not more than 1mm.
Described thief hole is at least 3, and those thief holes are separately positioned on three different sagittal planes of probe tube
On.
The gas cushion is highly not less than the 80% of engine exhaust bore.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, the present invention in NOx sensor measurement head be arranged on measurement intracavitary, probe tube top with measure chamber communicate and with survey
Amount bottom of chamber portion is mutually welded, and is to be provided with several thief holes on gas buffer chamber, probe tube inside probe tube；Tail gas passes through sampling
Hole enters gas buffer chamber and reaches measurement chamber, and NOx sensor measures uniform engine exhaust in measurement intracavitary, and existing
NOx sensor direct sample emission measuring mode is compared, and improves NOx measurement accuracy.
2nd, this gas cushion is simple in construction, and does not influence the performance of engine.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is the engine exhaust system schematic diagram for being provided with gas cushion.
Fig. 3 is the engine exhaust system schematic diagram for not installing gas cushion.
Fig. 4 is ESC circulation C100 operating modes NOx sensor measurement result of the test figures in specific embodiment of the invention.
Fig. 5 is the operating mode NOx sensor of ESC circulation As 25 measurement result of the test figure in specific embodiment of the invention.
Fig. 6 is engine test bench characteristic back pressure test result figure in specific embodiment of the invention.
Fig. 7 is engine test bench characteristic fuel consumption trial result figure in specific embodiment of the invention.
In figure：The exhaust pipe of engine 1, measures chamber 2, probe tube 3, thief hole 4, NOx sensor 5, catalyst converter 6.
Embodiment
Below in conjunction with brief description of the drawings, the present invention is described in further detail with embodiment.
It is a kind of to be used to improving the gas cushion of engine NOx measurement accuracy referring to Fig. 1, gas cushion design with
The geomery of the exhaust pipe of engine 1 is engaged, and gas cushion welding equipment is in the exhaust pipe of engine 1 and requires the gas cushion
Design and installation will not on engine performance produce influence.This gas cushion includes measurement chamber 2 and the sampling of bottom on top
Pipe 3, the arcuate structure at the top of measurement chamber 2 is engaged with the cylindrical exhaust pipe of engine 1, and the described top of measurement chamber 2 is welded
It is connected on the exhaust pipe of engine 1；Measure the cavity of chamber 2 to close with the matching size of NOx sensor 5, the measurement head of NOx sensor 5 is arranged on
Measure in chamber 2 and reserved measurement space.The described top of probe tube 3 communicates with measurement chamber 2 and mutually welded with measurement chamber 2 bottom,
The inside of probe tube 3 is to be provided with several thief holes 4 on gas buffer chamber, probe tube 3；
Referring to Fig. 1, further, the described wall thickness of probe tube 3 is not more than 1mm.
Referring to Fig. 1, further, described thief hole 4 is at least 3, and those thief holes 4 are separately positioned on probe tube
On 3 three different sagittal planes；Thief hole 4 is small should be able to extract essentially identical gas sample flow.
Referring to Fig. 1, further, the gas cushion is highly not less than the 80% of the internal diameter of the exhaust pipe of engine 1.
Referring to Fig. 1, tail gas is by the way that thief hole 4 is into the gas buffer chamber in probe tube 3 and reaches measurement chamber 2, NOx sensings
Device uniform motor exhaust of measurement in measurement chamber 2, so as to reach raising NOx measurement accuracy purposes.
Referring to Fig. 2 to Fig. 3, Fig. 2 and Fig. 3 are respectively the engine exhaust system device contrast for whetheing there is this gas cushion,
There it can be seen that this gas cushion has, simple in construction, easy for installation, without destroying, engine system assembly arrangement etc. is excellent
Point.
Specific embodiment：
After the engine SCR aftertreatment system of state five installs this gas cushion, in ESC state of cyclic operations, arranged with stand
Analyzer contrast is put, so as to evaluate the measurement result of operating point NOx sensor 5 of minimum and maximum extraction flow.
Referring to Fig. 4 to Fig. 5, ESC working condition tests evaluation result as shown in Figure 4, Figure 5, it can be seen that pass through install
This gas cushion, the measured deviation value of NOx sensor 5 of the operating point of minimum and maximum extraction flow is within 5%；And it is traditional
The measurement accuracy of NOx sensor 5 be in ± 10% scope, and catalyst outlet will by gaseous mixture wake flow and vortex be influenceed,
Measured deviation can be increased further；With stand emission analyzer contrast, NOx sensor 5 measurement mean deviation be in 13%~
Between 18%.It follows that using this gas cushion, the measurement accuracy effect of NOx sensor 5 is obvious.
Referring to Fig. 6 to Fig. 7, meanwhile, shadow can or can not be produced to engine performance (exhaust back pressure) by installing this gas cushion
RingSuch as have an impact, be likely to result in the fuel consumption rise of engine.Given shown in Fig. 6, Fig. 7, without this gas buffer
Device engine test bench characteristic Experimental Comparison result, result of the test is shown, installs the increasing of gas cushion engine test bench characteristic exhaust back pressure additional
Plus no more than 2%, the fuel consumption of engine is differed within ± 1%, and whole structure is good.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, said structure should be all considered as belonging to
Protection scope of the present invention.
Claims (4)
1. a kind of gas cushion for being used to improve engine NOx measurement accuracy, it is characterised in that：The gas cushion welding equipment exists
The exhaust pipe of engine（1）Interior, it includes the measurement chamber on top（2）With the probe tube of bottom（3）, described measurement chamber（2）Top
It is welded on the exhaust pipe of engine（1）On, measure chamber（2）Cavity and NOx sensor（5）It is engaged, NOx sensor（5）Measurement head
Installed in measurement chamber（2）Interior, described probe tube（3）Top and measurement chamber（2）Communicate and with measuring chamber（2）Bottom is mutually welded,
Probe tube（3）Inside is gas buffer chamber, probe tube（3）On be provided with several thief holes（4）.
2. a kind of gas cushion for being used to improve engine NOx measurement accuracy according to claim 1, its feature exists
In：Described probe tube（3）Wall thickness is not more than 1mm.
3. a kind of gas cushion for being used to improve engine NOx measurement accuracy according to claim 1, its feature exists
In：Described thief hole（4）At least 3, and those thief holes（4）It is separately positioned on probe tube（3）Three different radial directions
In plane.
4. a kind of gas cushion for being used to improve engine NOx measurement accuracy according to claim 1, its feature exists
In：The gas cushion is highly not less than the exhaust pipe of engine（1）The 80% of internal diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710487402.2A CN107328893A (en) | 2017-06-23 | 2017-06-23 | Gas buffer for improving measurement accuracy of NOx of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710487402.2A CN107328893A (en) | 2017-06-23 | 2017-06-23 | Gas buffer for improving measurement accuracy of NOx of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107328893A true CN107328893A (en) | 2017-11-07 |
Family
ID=60195526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710487402.2A Pending CN107328893A (en) | 2017-06-23 | 2017-06-23 | Gas buffer for improving measurement accuracy of NOx of engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107328893A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030070472A1 (en) * | 1999-07-02 | 2003-04-17 | Tokihiro Tsukamoto | Method for easily measuring nitrogen oxide concentration of an engine vehicle emission |
| CN101266156A (en) * | 2008-04-03 | 2008-09-17 | 天津工业大学 | Portable Gas Flow Analyzer for Automobile Simple Transient Condition Method Emission Detection |
| CN201464455U (en) * | 2009-07-08 | 2010-05-12 | 天津雷沃动力股份有限公司 | Portable test device for nitrogen oxides |
| JP2015055227A (en) * | 2013-09-13 | 2015-03-23 | ダイムラー・アクチェンゲゼルシャフトＤａｉｍｌｅｒ ＡＧ | Attachment structure of exhaust gas sensor |
| CN104763498A (en) * | 2015-03-05 | 2015-07-08 | 天纳克（苏州）排放系统有限公司 | Diesel engine nitrogen oxide after-treatment system, control method and application |
| CN204666370U (en) * | 2015-04-30 | 2015-09-23 | 无锡伟博汽车科技有限公司 | A kind of NOx sensor mounting pipe measured for vehicle exhaust |
| CN106401704A (en) * | 2016-10-28 | 2017-02-15 | 东风商用车有限公司 | Sulfur poisoning eliminating device for SCR (selective catalytic reduction) catalyst of diesel engine and using method of sulfur poisoning eliminating device |
| CN206945663U (en) * | 2017-06-23 | 2018-01-30 | 东风商用车有限公司 | Gas buffer for improving measurement accuracy of NOx of engine |
-
2017
- 2017-06-23 CN CN201710487402.2A patent/CN107328893A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030070472A1 (en) * | 1999-07-02 | 2003-04-17 | Tokihiro Tsukamoto | Method for easily measuring nitrogen oxide concentration of an engine vehicle emission |
| CN101266156A (en) * | 2008-04-03 | 2008-09-17 | 天津工业大学 | Portable Gas Flow Analyzer for Automobile Simple Transient Condition Method Emission Detection |
| CN201464455U (en) * | 2009-07-08 | 2010-05-12 | 天津雷沃动力股份有限公司 | Portable test device for nitrogen oxides |
| JP2015055227A (en) * | 2013-09-13 | 2015-03-23 | ダイムラー・アクチェンゲゼルシャフトＤａｉｍｌｅｒ ＡＧ | Attachment structure of exhaust gas sensor |
| CN104763498A (en) * | 2015-03-05 | 2015-07-08 | 天纳克（苏州）排放系统有限公司 | Diesel engine nitrogen oxide after-treatment system, control method and application |
| CN204666370U (en) * | 2015-04-30 | 2015-09-23 | 无锡伟博汽车科技有限公司 | A kind of NOx sensor mounting pipe measured for vehicle exhaust |
| CN106401704A (en) * | 2016-10-28 | 2017-02-15 | 东风商用车有限公司 | Sulfur poisoning eliminating device for SCR (selective catalytic reduction) catalyst of diesel engine and using method of sulfur poisoning eliminating device |
| CN206945663U (en) * | 2017-06-23 | 2018-01-30 | 东风商用车有限公司 | Gas buffer for improving measurement accuracy of NOx of engine |
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Application publication date: 20171107 |