CN104912637B - One kind avoids NH3Cross-inductive is to NOxSensor produces the system and method for interference - Google Patents
One kind avoids NH3Cross-inductive is to NOxSensor produces the system and method for interference Download PDFInfo
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- CN104912637B CN104912637B CN201510298033.3A CN201510298033A CN104912637B CN 104912637 B CN104912637 B CN 104912637B CN 201510298033 A CN201510298033 A CN 201510298033A CN 104912637 B CN104912637 B CN 104912637B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
One kind avoids NH3Cross-inductive is to NOxSensor produces the system and method for interference, including blast pipe, ammonia tourie, jet pump, air compressor machine, the first pipeline, second pipe and control unit；On the blast pipe the first NO is disposed with from gas inlet port to air exit endxSensor, urea nozzle, SCR catalytic converter, the 2nd NOxSensor and aperture；In first pipeline one end insertion aperture, the other end is stretched into ammonia tourie, and second pipe one end is stretched into ammonia tourie, other end connection jet pump, and the 3rd NO is provided between second pipe both endsxSensor, jet pump connection air compressor machine；First NOxSensor, urea nozzle, the 2nd NOxSensor, the 3rd NOxSensor is connected with control unit.Improvement estimated NO by cross-inductive constant in the pastxThe deficiency of volume fraction method, make SCR catalytic converter rear end NOxSensor can obtain more accurate NOxVolume fraction.
Description
Technical field
The invention belongs to diesel exhaust aftertreatment field, and in particular to one kind avoids NH3Cross-inductive is to NOxSensor
Produce the system and method for interference.
Technical background
Diesel engine has higher fuel economy and relatively low CO relative to gasoline engine2Discharge, because diesel engine is commonly used
Operating mode is in oxygen-enriched combusting state, so as to cause have higher NOxDischarge, urea type SCR（Urea-SCR）Skill
Art is considered as to reduce diesel engine NOxOne of most promising post-processing technology of discharge.To meet that Urea-SCR systems are accurately controlled
System and OBD function are, it is necessary to force to add NOxSensor is to provide the feedback information of system.
Abroad, NOxSensor has been widely used in using diesel engine as in the SCR system of power, but NOxSensor
To NH3With significant cross-inductive phenomenon.The characteristic causes the NO positioned at catalyst rear endxIs there is NH in sensor3During escape
Reading value it is higher, cause during closed-loop control system to spray into more urea, and then cause more NH3Escape and higher NOx
Sensor reading.Conventional method is to compensate NH using the cross-inductive constant of manufacturer's offer at present3Caused NOxSensor is read
Number error, but the constant can change with the sensor ageing and change of environmental factor.In order to preferably solve NOxSensor pair
NH3Cross-inductive phenomenon, it is necessary to which a kind of new method and system obtains accurate NOxVolume fraction, to meet Urea-SCR
System controls and OBD function.
The content of the invention
In order to solve the above technical problems, the present invention, which provides one kind, avoids NH3Cross-inductive is to NOxSensor produces interference
System and method, NO was estimated by cross-inductive constant in the past to improvexThe deficiency of volume fraction method, turn SCR catalysis
Parallel operation rear end NOxSensor can obtain more accurate NOxVolume fraction.
One kind provided by the invention avoids NH3Cross-inductive is to NOxThe system that sensor produces interference, including blast pipe, ammonia
Tourie, jet pump, air compressor machine, the first pipeline, second pipe and control unit；
On the blast pipe the first NO is disposed with from gas inlet port to air exit endxSensor, urea nozzle,
SCR catalytic converter, the 2nd NOxSensor and aperture；
Described first pipeline one end is inserted in the aperture, and the other end is stretched into ammonia tourie, described second pipe one end
Stretch into the ammonia tourie, other end connection jet pump, the 3rd NO is installed between the second pipe both endsxSensor,
The jet pump connects air compressor machine；
First NOxSensor, urea nozzle, the 2nd NOxSensor, the 3rd NOxSensor connects with control unit
Connect.
In such scheme, CuSO is contained with the ammonia tourie4Solution, its concentration are 0.02g/ml.
In such scheme, first pipeline, second pipe are transparent teflon pipe.
First NOxSensor and the 2nd NOxSensor is connected by screwed hole with blast pipe.
One kind avoids NH3Cross-inductive is to NOxThe method that sensor produces interference, comprises the following steps：
Step 1：Air compressor machine is opened, adjusts the operating pressure of jet pump, is vented and enters through the first pipeline in ammonia tourie,
It is 5L/min to control into extraction flow in ammonia tourie；
First NOxNO in sensor measurement Raw exhaustxVolume fraction, control the emitted dose of urea nozzle；Described second
NOxSensor measurement SCR catalytic converter downstream NOx+K×NH3（WhereinKFor the cross-inductive coefficient of NOx sensor）Volume
Fraction, the 3rd NOxThat sensor measures is the real NO in SCR catalytic converter downstreamxVolume fraction；
Step 2：CuSO in ammonia tourie4Solution quickly and efficiently absorbs the NH in tail gas3, while NO is in the solution
Solubility is very low, NO2The HNO generated in the solution with water reaction2Meeting fast decoupled releases NO without influenceing when higher than normal temperature
NOxVolume fraction；
Step 3：By the NH in the exhaust of ammonia tourie3It is fully absorbed, residual gas is discharged through second pipe, together
When the 3rd NOxNO in sensor measurement second pipexVolume fraction；
Step 4：3rd NOxSensor passes information to control unit, the injection of control unit amendment urea nozzle
Amount, realizes closed-loop control.
Beneficial effects of the present invention：The present invention preferably solves NOxThe NH of sensor3Cross-inductive characteristic senses to NOx
The influence of device reading, diesel engine is set to obtain the NO of more accurate SCR catalyst rear end when each operating mode is runxSensor is read
Number, SCR catalyst rear end NO caused by avoiding escape ammoniaxSensor reading is higher, leads to not carry out urea liquid injection
The closed-loop control of amount；The NH of escape3, can be by the CuSO in ammonia tourie into ammonia tourie4Solution fully absorbs, the row of avoiding
Enter and environmental pollution is caused in air, while CuSO4Solution is to NOxThe influence of volume fraction is very small, and in ammonia tourie
CuSO4Solution can regularly replace；NOxSensor 2 and NOxSensor 3 exists simultaneously, can effectively monitor NH3Escape situation, simultaneously
Also can be by contrasting NOxSensor 2 and NOxSensor 3 reading monitors CuSO4Solution whether saturation；A kind of exclusion of the present invention
NOxThe NH of sensor3Cross-inductive realizes that the system equipment of SCR closed-loop controls is simple, and easy to operate, cost is low, can be in Urea-
SCR system reduces diesel engine NOxEmissions field popularization and application.
Brief description of the drawings
Fig. 1 is that one kind avoids NH3Cross-inductive is to NOxSensor produces the system schematic of interference.
In figure：100th, blast pipe；101st, the first NOxSensor；102nd, urea nozzle；103rd, SCR catalytic converter；104、
2nd NOxSensor；105th, ammonia tourie；106th, the 3rd NOxSensor；107th, jet pump；108th, air compressor machine；109th, aperture；
110th, the first pipeline；111st, second pipe.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is further described, but protection scope of the present invention is not limited to
In this.
As shown in figure 1, one kind avoids NH3Cross-inductive is to NOxThe system that sensor produces interference, including blast pipe 100,
Ammonia tourie 105, jet pump 107, air compressor machine 108, the first pipeline 110, second pipe 111 and control unit；The blast pipe
On 100 the first NO is disposed with from gas inlet port to air exit endxSensor 101, urea nozzle 102, SCR catalysis turn
Parallel operation 103, the 2nd NOxSensor 104 and aperture 109；
Described one end of first pipeline 110 is inserted in the aperture 109, and the other end is stretched into ammonia tourie 105, and described second
The one end of pipeline 111 is stretched into the ammonia tourie 105, other end connection jet pump 107, between the both ends of second pipe 111
3rd NO is installedxSensor 106, the jet pump 107 connect air compressor machine 108；
First NOxSensor 101, urea nozzle 102, the 2nd NOxSensor 104, the 3rd NOxSensor（106）
It is connected with control unit.The ammonia tourie（105）Inside it is contained with CuSO4Solution, its concentration are 0.02g/ml.CuSO4Solution liquid
Position control is between mark minimum point and mark peak.Assimilation effect is poor when solution is very few, and easy consumption is complete；Solution excessively can
It is pumped to NOxIn sensor survey mass, the 3rd NO is causedxSensor 106 damages.First pipeline 110, second pipe 111 are equal
For transparent teflon pipe, there is heat endurance, good corrosion resistance, inside pipe wall not to adhere to impurity, to NO for itxVolume fraction is without shadow
The advantages that ringing.
One kind avoids NH3Cross-inductive is to NOxThe method that sensor produces interference, comprises the following steps：
Step 1：Air compressor machine 108 is opened, the operating pressure of jet pump 107 is adjusted, is vented and enters ammonia through the first pipeline 110
In tourie 105, it is 5L/min to control into extraction flow in ammonia tourie 105；
First NOxSensor 101 measures the NO in Raw exhaustxVolume fraction, control the emitted dose of urea nozzle 102；Institute
State the 2nd NOxSensor 104 measures the downstream NO of SCR catalytic converter 103x+K×NH3（WhereinKFor the intersection sense of NOx sensor
Answer coefficient）Volume fraction, the 3rd NOxThat sensor measures is the real NO in SCR catalytic converter downstreamxVolume fraction；
Step 2：CuSO in ammonia tourie 1054Solution quickly and efficiently absorbs the NH in tail gas3, while NO is in solution
In solubility it is very low, NO2The HNO generated in the solution with water reaction2When higher than normal temperature can fast decoupled release NO without
Influence NOxVolume fraction；
Step 3：By the NH in the exhaust of ammonia tourie 1053It is fully absorbed, residual gas is through the row of second pipe 111
Go out, while the 3rd NOxSensor 106 measures NO in second pipexVolume fraction；By absorbing the NH in being vented3So that the 3rd
NOxThe reading of sensor 106 is more accurate；
Step 4：3rd NOxSensor 106 passes information to control unit, control unit amendment urea nozzle 102
Emitted dose, realize closed-loop control.
The embodiment is the preferred embodiment of the present invention, but the present invention is not limited to above-mentioned embodiment, is not being carried on the back
From the present invention substantive content in the case of, those skilled in the art can make it is any it is conspicuously improved, replace or
Modification belongs to protection scope of the present invention.
Claims (4)
1. one kind avoids NH3Cross-inductive is to NOxSensor produce interference system, it is characterised in that including blast pipe (100),
Ammonia tourie (105), jet pump (107), air compressor machine (108), the first pipeline (110), second pipe (111) and control unit；
On the blast pipe (100) the first NO is disposed with from gas inlet port to air exit endxSensor (101), urea
Nozzle (102), SCR catalytic converter (103), the 2nd NOxSensor (104) and aperture (109)；
Described first pipeline (110) one end is inserted in the aperture (109), and the other end is stretched into ammonia tourie (105), and described the
Two pipelines (111) one end is stretched into the ammonia tourie (105), other end connection jet pump (107), the second pipe
(111) the 3rd NO is installed between both endsxSensor (106), jet pump (107) the connection air compressor machine (108)；
First NOxSensor (101), urea nozzle (102), the 2nd NOxSensor (104), the 3rd NOxSensor (106)
It is connected with control unit.
2. one kind according to claim 1 avoids NH3Cross-inductive is to NOxThe system that sensor produces interference, its feature exist
In the ammonia tourie (105) is interior to be contained with CuSO4Solution, its concentration are 0.02g/ml.
3. one kind according to claim 1 avoids NH3Cross-inductive is to NOxThe system that sensor produces interference, its feature exist
In first pipeline (110), second pipe (111) are transparent teflon pipe.
4. one kind avoids NH3Cross-inductive is to NOxThe method that sensor produces interference, it is characterised in that comprise the following steps：
Step 1：Air compressor machine (108) is opened, the operating pressure of regulation jet pump (107), is vented and enters through the first pipeline (110)
In ammonia tourie (105), it is 5L/min to control into ammonia tourie (105) interior extraction flow；
First NOxNO in sensor (101) measurement Raw exhaustxVolume fraction, the emitted dose of control urea nozzle (102)；Institute
State the 2nd NOxSensor (104) measures SCR catalytic converter (103) downstream NOx+K×NH3Volume fraction, wherein K is NOx
The cross-inductive coefficient of sensor, the 3rd NOxThat sensor measures is the real NO in SCR catalytic converter downstreamxVolume integral
Number；
Step 2：CuSO in ammonia tourie (105)4Solution quickly and efficiently absorbs the NH in tail gas3, while NO is in the solution
Solubility it is very low, NO2The HNO generated in the solution with water reaction2Meeting fast decoupled releases NO without shadow when higher than normal temperature
Ring NOxVolume fraction；
Step 3：By the NH in the exhaust of ammonia tourie (105)3It is fully absorbed, residual gas is arranged through second pipe (111)
Go out, while the 3rd NOxNO in sensor (106) measurement second pipexVolume fraction；
Step 4：3rd NOxSensor (106) passes information to control unit, control unit amendment urea nozzle (102)
Emitted dose, realize closed-loop control.
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|---|---|---|---|
| CN201510298033.3A CN104912637B (en) | 2015-06-03 | 2015-06-03 | One kind avoids NH3Cross-inductive is to NOxSensor produces the system and method for interference |
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|---|---|---|---|
| CN201510298033.3A CN104912637B (en) | 2015-06-03 | 2015-06-03 | One kind avoids NH3Cross-inductive is to NOxSensor produces the system and method for interference |
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| CN104912637A CN104912637A (en) | 2015-09-16 |
| CN104912637B true CN104912637B (en) | 2017-11-17 |
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| CN107991432A (en) * | 2017-10-18 | 2018-05-04 | 潍柴动力股份有限公司 | Measure engine NH3The device and method of discharge |
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| EP2187009A2 (en) * | 2008-10-24 | 2010-05-19 | Delphi Technologies, Inc. | Method for operating exhaust gas treatment system |
| CN102518496A (en) * | 2012-01-05 | 2012-06-27 | 潍柴动力股份有限公司 | Method and system for controlling urea injecting quantity |
| JP2013124609A (en) * | 2011-12-15 | 2013-06-24 | Mitsubishi Motors Corp | Exhaust emission control device of internal combustion engine |
| CN104612791A (en) * | 2015-01-28 | 2015-05-13 | 东风商用车有限公司 | Method and system for controlling urea solution spraying amount in closed loop mode through SCR system |
| CN104619962A (en) * | 2012-06-20 | 2015-05-13 | 珀金斯发动机有限公司 | Method and apparatus for estimating a dosing-error in a selective catalytic reduction system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9080488B2 (en) * | 2011-03-24 | 2015-07-14 | Ford Global Technologies, Llc | Method for estimating slippage of a selective catalyst reduction system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2187009A2 (en) * | 2008-10-24 | 2010-05-19 | Delphi Technologies, Inc. | Method for operating exhaust gas treatment system |
| JP2013124609A (en) * | 2011-12-15 | 2013-06-24 | Mitsubishi Motors Corp | Exhaust emission control device of internal combustion engine |
| CN102518496A (en) * | 2012-01-05 | 2012-06-27 | 潍柴动力股份有限公司 | Method and system for controlling urea injecting quantity |
| CN104619962A (en) * | 2012-06-20 | 2015-05-13 | 珀金斯发动机有限公司 | Method and apparatus for estimating a dosing-error in a selective catalytic reduction system |
| CN104612791A (en) * | 2015-01-28 | 2015-05-13 | 东风商用车有限公司 | Method and system for controlling urea solution spraying amount in closed loop mode through SCR system |
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