CN104912637A - System and method for avoiding interference of NH3 cross induction on NOx sensors - Google Patents

System and method for avoiding interference of NH3 cross induction on NOx sensors Download PDF

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Publication number
CN104912637A
CN104912637A CN201510298033.3A CN201510298033A CN104912637A CN 104912637 A CN104912637 A CN 104912637A CN 201510298033 A CN201510298033 A CN 201510298033A CN 104912637 A CN104912637 A CN 104912637A
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China
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sensor
pipeline
pipe
volume fraction
ammonia tourie
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CN201510298033.3A
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CN104912637B (en
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王军
唐炜
李超
王兴华
何涛
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Jiangsu University
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Jiangsu University
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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

The invention discloses a system and a method for avoiding interference of NH3 cross induction on NOx sensors. The system comprises an exhaust pipe, an ammonia absorption tank, a jet pump, an air compressor, a first pipeline, a second pipeline and a control unit, wherein a first NOx sensor, a carbamide nozzle, an SCR catalytic converter, a second NOx sensor and a small hole are arranged on the exhaust pipe from the exhaust inlet end to the exhaust outlet end in sequence; one end of the first pipeline is inserted into the small hole, and the other end of the first pipeline stretches into the ammonia absorption tank; one end of the second pipeline stretches into the ammonia absorption tank, and the other end of the second pipeline is connected to the jet pump; a third NOx sensor is mounted between two ends of the second pipeline; the jet pump is connected to the air compressor; the first NOx sensor, the carbamide nozzle, the second NOx sensor and the third NOx sensor are connected to the control unit. By virtue of the system and the method, the defects of a method for estimating NOx volume fraction through the cross induction constant in the prior art can be solved; the rear-end NOx sensor of the SCR catalytic converter can be used for obtaining the relatively accurate NOx volume fraction.

Description

One avoids NH 3cross-inductive is to NO xsensor produces the system and method for interference
Technical field
The invention belongs to diesel exhaust aftertreatment field, be specifically related to one and avoid NH 3cross-inductive is to NO xsensor produces the system and method for interference.
Technical background
Diesel engine has higher fuel economy and lower CO relative to petrol engine 2discharge, commonly uses operating mode due to diesel engine and is in oxygen-enriched combusting state, thus cause there is higher NO xdischarge, urea type selective catalytic reduction (Urea-SCR) technology is considered to reduce diesel engine NO xone of the most promising post-processing technology of discharge.Accurately controlling and On-Board Diagnostics (OBD) function for meeting Urea-SCR system, needing pressure to add NO xsensor is to provide the feedback information of system.
Abroad, NO xsensor be widely used in diesel engine be power SCR system in, but NO xsensor is to NH 3there is significant cross-inductive phenomenon.This characteristic makes the NO being positioned at catalyzer rear end xthere is NH in sensor 3reading value during escape is higher, causes system to spray into more urea, and then cause more NH during closed loop control 3escape and higher NO xsensor reading.Current conventional method uses the cross-inductive constant that provides of manufacturer to compensate NH 3the NO caused xsensor reading error, but this constant can change with the change of sensor ageing and environmental factor.In order to solve NO better xsensor is to NH 3cross-inductive phenomenon, need a kind of new method and system to obtain accurate NO xvolume fraction, to meet Urea-SCR Systematical control and On-Board Diagnostics (OBD) function.
Summary of the invention
For solving the problems of the technologies described above, the invention provides one and avoiding NH 3cross-inductive is to NO xsensor produces the system and method for interference, estimates NO to improve by cross-inductive constant in the past xthe deficiency of volume fraction method, makes SCR catalytic converter rear end NO xsensor can obtain more accurate NO xvolume fraction.
One provided by the invention avoids NH 3cross-inductive is to NO xsensor produces the system of interference, comprises outlet pipe, ammonia tourie, Jet injector, air compressor, the first pipeline, second pipe and control unit;
Described outlet pipe is disposed with a NO from exhaust entrance end to exhaust outlet end xsensor, urea nozzle, SCR catalytic converter, the 2nd NO xsensor and aperture;
Described first pipeline one end is inserted in described aperture, and the other end stretches in ammonia tourie, and described second pipe one end is stretched in described ammonia tourie, and the other end connects Jet injector, is provided with the 3rd NO between described second pipe two ends xsensor, described Jet injector connects air compressor;
A described NO xsensor, urea nozzle, the 2nd NO xsensor, the 3rd NO xsensor is all connected with control unit.
In such scheme, in described ammonia tourie, be contained with CuSO 4solution, its concentration is 0.02g/ml.
In such scheme, described first pipeline, second pipe are transparent teflon pipe.
One NO xsensor and the 2nd NO xsensor is all connected with outlet pipe by tapped hole.
One avoids NH 3cross-inductive is to NO xsensor produces the method for interference, comprises the steps:
Step one: open air compressor, regulates the working pressure of Jet injector, is vented and enters in ammonia tourie through the first pipeline, and controlling to enter extraction flow in ammonia tourie is 5L/min;
One NO xnO in sensor measurement Raw exhaust xvolume fraction, controls the emitted dose of urea nozzle; Described 2nd NO xsensor measurement SCR catalytic converter downstream NO x+ k× NH 3(wherein kcross-inductive coefficient for NOx sensor) volume fraction, the 3rd NO xsensor measurement to be the real NO in SCR catalytic converter downstream xvolume fraction;
Step 2: the CuSO in ammonia tourie 4solution absorbs the NH in tail gas quickly and efficiently 3, NO solubility is in the solution very low simultaneously, NO 2the HNO generated is reacted in the solution with water 2nO is not affected releasing NO higher than meeting fast decoupled during normal temperature xvolume fraction;
Step 3: the NH in the exhaust of ammonia tourie 3be fully absorbed, residual gas is discharged through second pipe, simultaneously the 3rd NO xnO in sensor measurement second pipe xvolume fraction;
Step 4: the 3rd NO xinformation is passed to control unit by sensor, and the emitted dose of control unit correction urea nozzle, realizes closed loop control.
Beneficial effect of the present invention: the present invention solves NO better xthe NH of sensor 3cross-inductive characteristic, on the impact of NOx sensor reading, makes diesel engine all can obtain the NO of more accurate SCR catalyst rear end when each operating mode is run xsensor reading, avoids the SCR catalyst rear end NO that escape ammonia causes xsensor reading is higher, causes the closed loop control cannot carrying out urea solution jet amount; The NH escaped 3enter ammonia tourie, can by the CuSO in ammonia tourie 4solution fully absorbs, and avoids to enter in air to cause environmental pollution, simultaneously CuSO 4solution is to NO xthe impact of volume fraction is very little, and the CuSO in ammonia tourie 4solution can regularly replace; NO xsensor 2 and NO xsensor 3 exists simultaneously, effectively can monitor NH 3escape situation, simultaneously also by contrast NO xsensor 2 and NO xsensor 3 reading monitors CuSO 4whether solution is saturated; One of the present invention gets rid of NO xthe NH of sensor 3the system equipment that cross-inductive realizes SCR closed loop control is simple, and easy to operate, cost is low, can reduce diesel engine NO in Urea-SCR system xdischarge field is applied.
Accompanying drawing explanation
Fig. 1 is that one avoids NH 3cross-inductive is to NO xsensor produces the system schematic of interference.
In figure: 100, outlet pipe; 101, a NO xsensor; 102, urea nozzle; 103, SCR catalytic converter; 104, the 2nd NO xsensor; 105, ammonia tourie; 106, the 3rd NO xsensor; 107, Jet injector; 108, air compressor; 109, aperture; 110, the first pipeline; 111, second pipe.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is further described, but protection scope of the present invention is not limited thereto.
As shown in Figure 1, one avoids NH 3cross-inductive is to NO xsensor produces the system of interference, comprises outlet pipe 100, ammonia tourie 105, Jet injector 107, air compressor 108, first pipeline 110, second pipe 111 and control unit; Described outlet pipe 100 is disposed with a NO from exhaust entrance end to exhaust outlet end xsensor 101, urea nozzle 102, SCR catalytic converter 103, the 2nd NO xsensor 104 and aperture 109;
Described first pipeline 110 one end is inserted in described aperture 109, and the other end stretches in ammonia tourie 105, and described second pipe 111 one end is stretched in described ammonia tourie 105, and the other end connects Jet injector 107, is provided with the 3rd NO between described second pipe 111 two ends xsensor 106, described Jet injector 107 connects air compressor 108;
A described NO xsensor 101, urea nozzle 102, the 2nd NO xsensor 104, the 3rd NO xsensor (106) is all connected with control unit.CuSO is contained with in described ammonia tourie (105) 4solution, its concentration is 0.02g/ml.CuSO 4solution level controls between mark minimum point and mark peak.When solution is very few, assimilation effect is poor, and easy consumption is complete; Solution too much can be pumped to NO xin sensor measurement block, cause the 3rd NO xsensor 106 damages.Described first pipeline 110, second pipe 111 are transparent teflon pipe, its have thermostability, good corrosion resistance, inner tube wall not stuck foreign matter, to NO xvolume fraction is without advantages such as impacts.
One avoids NH 3cross-inductive is to NO xsensor produces the method for interference, comprises the steps:
Step one: open air compressor 108, regulates the working pressure of Jet injector 107, is vented and enters in ammonia tourie 105 through the first pipeline 110, and controlling to enter extraction flow in ammonia tourie 105 is 5L/min;
One NO xthe NO in Raw exhaust measured by sensor 101 xvolume fraction, controls the emitted dose of urea nozzle 102; Described 2nd NO xsCR catalytic converter 103 downstream NO measured by sensor 104 x+ k× NH 3(wherein kcross-inductive coefficient for NOx sensor) volume fraction, the 3rd NO xsensor measurement to be the real NO in SCR catalytic converter downstream xvolume fraction;
Step 2: the CuSO in ammonia tourie 105 4solution absorbs the NH in tail gas quickly and efficiently 3, NO solubility is in the solution very low simultaneously, NO 2the HNO generated is reacted in the solution with water 2nO is not affected releasing NO higher than meeting fast decoupled during normal temperature xvolume fraction;
Step 3: the NH in the exhaust of ammonia tourie 105 3be fully absorbed, residual gas is discharged through second pipe 111, simultaneously the 3rd NO xnO in second pipe measured by sensor 106 xvolume fraction; By absorbing the NH in exhaust 3make the 3rd NO xsensor 106 reading is more accurate;
Step 4: the 3rd NO xinformation is passed to control unit by sensor 106, and the emitted dose of control unit correction urea nozzle 102, realizes closed loop control.
Described embodiment is the preferred embodiment of the present invention; but the present invention is not limited to above-mentioned mode of execution; when not deviating from flesh and blood of the present invention, any apparent improvement that those skilled in the art can make, replacement or modification all belong to protection scope of the present invention.

Claims (4)

1. avoid NH for one kind 3cross-inductive is to NO xsensor produces the system of interference, it is characterized in that, comprises outlet pipe (100), ammonia tourie (105), Jet injector (107), air compressor (108), the first pipeline (110), second pipe (111) and control unit;
Described outlet pipe (100) is disposed with a NO from exhaust entrance end to exhaust outlet end xsensor (101), urea nozzle (102), SCR catalytic converter (103), the 2nd NO xsensor (104) and aperture (109);
Described first pipeline (110) one end is inserted in described aperture (109), the other end stretches in ammonia tourie (105), described second pipe (111) one end is stretched in described ammonia tourie (105), the other end connects Jet injector (107), is provided with the 3rd NO between described second pipe (111) two ends xsensor (106), described Jet injector (107) connects air compressor (108);
A described NO xsensor (101), urea nozzle (102), the 2nd NO xsensor (104), the 3rd NO xsensor (106) is all connected with control unit.
2. one according to claim 1 avoids NH 3cross-inductive is to NO xsensor produces the system of interference, it is characterized in that, is contained with CuSO in described ammonia tourie (105) 4solution, its concentration is 0.02g/ml.
3. one according to claim 1 avoids NH 3cross-inductive is to NO xsensor produces the system of interference, and it is characterized in that, described first pipeline (110), second pipe (111) are transparent teflon pipe.
4. avoid NH for one kind 3cross-inductive is to NO xsensor produces the method for interference, it is characterized in that, comprises the steps:
Step one: open air compressor (108), regulates the working pressure of Jet injector (107), is vented and enters in ammonia tourie (105) through the first pipeline (110), and controlling to enter ammonia tourie (105) interior extraction flow is 5L/min;
One NO xthe NO in Raw exhaust measured by sensor (101) xvolume fraction, controls the emitted dose of urea nozzle (102); Described 2nd NO xsCR catalytic converter (103) downstream NO measured by sensor (104) x+ k× NH 3( kcross-inductive coefficient for NOx sensor) volume fraction, the 3rd NO xsensor measurement to be the real NO in SCR catalytic converter downstream xvolume fraction;
Step 2: the CuSO in ammonia tourie (105) 4solution absorbs the NH in tail gas quickly and efficiently 3, NO solubility is in the solution very low simultaneously, NO 2the HNO generated is reacted in the solution with water 2nO is not affected releasing NO higher than meeting fast decoupled during normal temperature xvolume fraction;
Step 3: the NH in the exhaust of ammonia tourie (105) 3be fully absorbed, residual gas is discharged through second pipe (111), simultaneously the 3rd NO xnO in second pipe measured by sensor (106) xvolume fraction;
Step 4: the 3rd NO xinformation is passed to control unit by sensor (106), and the emitted dose of control unit correction urea nozzle (102), realizes closed loop control.
CN201510298033.3A 2015-06-03 2015-06-03 One kind avoids NH3Cross-inductive is to NOxSensor produces the system and method for interference Active CN104912637B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US20110185707A1 (en) * 2011-03-24 2011-08-04 Ford Global Technologies, Llc Method for estimating slippage of a selective catalyst reduction 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

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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
US20110185707A1 (en) * 2011-03-24 2011-08-04 Ford Global Technologies, Llc Method for estimating slippage of a selective catalyst reduction 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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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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