CN109681304A - A kind of SCR system urea nozzle blocking recognition methods - Google Patents
A kind of SCR system urea nozzle blocking recognition methods Download PDFInfo
- Publication number
- CN109681304A CN109681304A CN201811589885.8A CN201811589885A CN109681304A CN 109681304 A CN109681304 A CN 109681304A CN 201811589885 A CN201811589885 A CN 201811589885A CN 109681304 A CN109681304 A CN 109681304A
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- China
- Prior art keywords
- urea nozzle
- urea
- injection
- scr system
- pressure
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- Y02T10/12—Improving ICE efficiencies
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a kind of SCR system urea nozzles to block recognition methods, the amplitude of pressure oscillation in pressure pipe in urea nozzle opening course of injection is compared by monitoring, to judge urea nozzle with the presence or absence of blocking indirectly.In the case where not increasing additional components, the case where urea nozzle Partial Blocking can be determined.Can urea nozzle be blocked completely before identify, equipment maintenance can be carried out based on prompt information, avoid causing the generation of the exceeded failure of vehicle NOx because urea can not spray.Monitor urea nozzle Partial Blocking function SCR system work normally during, that is, it is implementable, do not need additional trigger action.
Description
Technical field
The invention belongs to SCR (selective catalytic reduction) system, more particularly to a kind of blocking identification of SCR system urea nozzle
Method.
Background technique
It is more and more using diesel engine as power as national legislation is to require continuous of automotive emission plus tight
Vehicle on require install additional SCR system, by accurate quantification spray high pressure urea solution into exhaust pipe, in tail gas
NOx reacts, and produces N2And H2O.The levels of precision of urea liquid the amount of injection is to influence NOx emission in vehicle exhaust to weigh very much
The factor wanted.
In actual operation, because urea liquid there are granule foreigns, and influenced by urea crystals, urea nozzle
Spray orifice can there is a problem of gradually blocked in use.The gradually blocking of nozzle, it is on the low side to will lead to urea injecting quantity, into
And cause NOx emission in vehicle exhaust exceeded, cause environmental pollution.Meanwhile the OBD system on vehicle also can detect it is higher
NOx emission Times be out of order, prompt discharge exceeded, and activate and limit the performance of vehicle, urge driver's on-call maintenance vehicle.
SCR system urea nozzle currently on the market is generally more spray orifice injection apparatus by solenoid valve control.Installation
The prompt that reports an error can only be carried out when urea liquid nozzle is completely plugged in the SCR system on vehicle, i.e., can only identify completely plugged
Not completely plugged two states.The inaccuracy of the urea injecting quantity for caused by Partial Blocking is known currently without online well
Other method, can only in after-sales service by measuring cup collect injection valve spray urea liquid simultaneously measure its volume, and with setting
Value, which is compared, obtains judge conclusion.
The above method, when being only applicable to after-sales service, vehicle enters maintenance station, by urea nozzle from the installation site of former vehicle
It is detected after removing.When SCR system is run on vehicle, the Partial Blocking failure of urea nozzle still can not be identified.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of SCR system urea nozzles to block recognition methods, utilizes SCR
The existing sensor of system and control system, by the Parameters variation during supervisory control system running, effectively to identify that nozzle is
It is no that there are Partial Blockings.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that:
A kind of SCR system urea nozzle blocking recognition methods, comprising the following steps:
A. the corresponding relationship of the amount of injection Qs and pressure oscillation amplitude limit Δ Pmin of urea nozzle are established；
B. controller obtains average pressure value P when not spraying in pressure pipe by pressure sensor respectively0With sprayed
Pressure oscillation value P in journey1(i), and controller also obtains current the amount of injection Qs when spraying；
C. when secondary AEI After End of Injection, the pressure oscillation amplitude Δ P in the secondary course of injection is calculated by controller, and with
It is compared by inquiring pressure oscillation amplitude limit Δ Pmin corresponding to the amount of injection Qs:
If judging that urea nozzle is unplugged when Δ P >=Δ Pmin；If judging urea nozzle generating unit when Δ P < Δ Pmin
Divide blocking.
In step c, the calculation formula of the pressure oscillation amplitude Δ P are as follows: Δ P=P1(i)-P0。
Recognition methods is blocked using a kind of SCR system urea nozzle of the invention, is had several advantages that
1, in the case where not increasing additional components, the case where urea nozzle Partial Blocking can be determined.
2, it can be identified before SCR system urea nozzle is blocked completely, plant maintenance guarantor can be carried out based on prompt information
It supports, avoids causing the generation of the exceeded failure of vehicle NOx because urea can not spray.
3, monitor urea nozzle Partial Blocking function SCR system work normally during, that is, it is implementable, do not need
Additional trigger action.
Detailed description of the invention
The present invention is described in detail with reference to the accompanying drawings and detailed description:
Fig. 1 is the functional block diagram of SCR system.
Fig. 2 is the flow diagram of recognition methods of the invention.
Fig. 3 is the limit value of fluctuating range and the graph of relation of predetermined urea injecting quantity.
Specific embodiment
The Basic Design thinking of SCR system urea nozzle blocking recognition methods of the invention is as follows:
Referring to Figure 1, SCR system is generally by urea tank 1, urea supply module 2, urea nozzle 3, pipette 4, pressure pipe
5, liquid back pipe 6, controller 7 form.
In order to allow urea nozzle 3 to spray urea liquid according to scheduled the amount of injection, need by being integrated in urea supply mould
The pressure in 21 real-time measurement pressure pipe 5 of pressure sensor in block 2 controls the electricity in urea supply module 2 by controller 7
The duty ratio of machine makes to maintain pressure to stablize in pressure pipe 5, eventually by the solenoid valve open time of control urea nozzle 3, to reach
The purpose sprayed from the spray orifice of urea nozzle 3 to the urea injecting quantity of setting.
During urea nozzle 3 sprays urea, the fluctuation of urea liquid pressure in pressure pipe 5, the amount of injection will lead to
Bigger, then pressure oscillation is bigger.
Based on the above principles, for urea nozzle 3 on the market frequent occurrence Partial Blocking the problem of, the present invention can pass through
The amplitude that urea nozzle 3 opens pressure oscillation in pressure pipe 5 in course of injection is compared in monitoring, whether judges urea nozzle 3 indirectly
There are blockings.Under the amount of injection of a certain setting, if pressure oscillation does not reach preset fluctuating range limit in pressure pipe 5
Value then can determine whether out that urea nozzle 3 has blocking；It is on the contrary, then it is assumed that urea nozzle 3 does not block.The limit value of fluctuating range is simultaneously
A not instead of constant changes, as shown in Figure 3 as predetermined urea injecting quantity changes.
Therefore, SCR system urea nozzle of the invention blocking recognition methods is as shown in Fig. 2, using following steps:
A. the corresponding relationship for establishing the amount of injection Qs and pressure oscillation amplitude limit Δ Pmin of urea nozzle, is such as shown in Table 1:
Table 1
B. judge that current urea nozzle is in injection or non-spray regime by controller 7, (such as by pressure sensor 21
The pressure sensor being integrated in urea supply module) average pressure value P in pressure pipe when not spraying is monitored respectively0And injection
Pressure oscillation value P in the process1(i) and by controller 7 current the amount of injection Qs is recorded, the amount of injection Qs is controlled in controller 7
Set amount in engine operation process；
C. when secondary AEI After End of Injection, the pressure oscillation amplitude Δ P in the secondary course of injection is calculated by controller 7, is counted
Calculate formula are as follows: Δ P=P1(i)-P0, and Δ P is obtained into pressure oscillation amplitude corresponding to the amount of injection Qs with by inquiry table 1
Limit Δ Pmin is compared；
If judging that urea nozzle is unplugged when Δ P >=Δ Pmin；If judging urea nozzle generating unit when Δ P < Δ Pmin
Divide blocking.
For example, when calculating Δ P=120hPa, and detected the amount of injection Qs is 80, passes through its correspondence of 1 acquisition of tabling look-up
Δ Pmin=160hPa, Δ P < Δ Pmin, then judge urea nozzle occur Partial Blocking；When calculating Δ P=120hPa, and
Detected the amount of injection Qs is 50, and by its corresponding Δ Pmin=100hPa of 1 acquisition that tables look-up, Δ P > Δ Pmin then judges
Urea nozzle does not block.
But those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate this
Invention, and be not used as limitation of the invention, as long as in spirit of the invention, to embodiment described above
Variation, modification will all fall within the scope of claims of the present invention.
Claims (2)
1. a kind of SCR system urea nozzle blocks recognition methods, which comprises the following steps:
A. the corresponding relationship of the amount of injection Qs and pressure oscillation amplitude limit Δ Pmin of urea nozzle are established；
B. controller obtains average pressure value P when not spraying in pressure pipe by pressure sensor respectively0In course of injection
Pressure oscillation value P1(i), and controller also obtains current the amount of injection Qs when spraying；
C. when secondary AEI After End of Injection, the pressure oscillation amplitude Δ P in the secondary course of injection is calculated by controller, and with pass through
Pressure oscillation amplitude limit Δ Pmin corresponding to the amount of injection Qs is inquired to be compared:
If judging that urea nozzle is unplugged when Δ P >=Δ Pmin；If when Δ P < Δ Pmin, it is stifled to judge that part occurs for urea nozzle
Plug.
2. a kind of SCR system urea nozzle according to claim 1 blocks recognition methods, it is characterised in that: in step c
In, the calculation formula of the pressure oscillation amplitude Δ P are as follows: Δ P=P1(i)-P0。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811589885.8A CN109681304A (en) | 2018-12-25 | 2018-12-25 | A kind of SCR system urea nozzle blocking recognition methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811589885.8A CN109681304A (en) | 2018-12-25 | 2018-12-25 | A kind of SCR system urea nozzle blocking recognition methods |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109681304A true CN109681304A (en) | 2019-04-26 |
Family
ID=66189347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811589885.8A Pending CN109681304A (en) | 2018-12-25 | 2018-12-25 | A kind of SCR system urea nozzle blocking recognition methods |
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| Country | Link |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296029A (en) * | 2019-06-28 | 2019-10-01 | 潍柴动力股份有限公司 | The detection method and device of snifting valve state |
| CN111894715A (en) * | 2020-08-10 | 2020-11-06 | 上海星融汽车科技有限公司 | Blockage detection method and system for SCR tail gas treatment system nozzle and vehicle |
| CN112031903A (en) * | 2020-09-10 | 2020-12-04 | 上海星融汽车科技有限公司 | Fault diagnosis method for SCR urea injection device |
| CN112523847A (en) * | 2020-10-27 | 2021-03-19 | 广西玉柴机器股份有限公司 | Method for diagnosing urea consumption deviation based on pump pressure |
| CN112648058A (en) * | 2021-01-04 | 2021-04-13 | 东风汽车股份有限公司 | Urea injection device of engine SCR system and fault diagnosis method thereof |
| CN112879134A (en) * | 2021-01-25 | 2021-06-01 | 凯龙高科技股份有限公司 | Non-air-assisted urea nozzle blockage diagnosis and self-repair control device and method |
| CN112879135A (en) * | 2021-01-25 | 2021-06-01 | 凯龙高科技股份有限公司 | Device and method for diagnosing urea consumption of non-air-assisted urea pump |
| CN113236405A (en) * | 2021-06-08 | 2021-08-10 | 潍柴动力股份有限公司 | Fault diagnosis method and device for urea injection system |
| CN113551699A (en) * | 2021-09-17 | 2021-10-26 | 山东德仕化工有限公司 | Method and equipment for detecting blockage of oil well pipeline |
| CN114087037A (en) * | 2021-10-20 | 2022-02-25 | 中广核核电运营有限公司 | State detection method and system for low-pressure cylinder spraying device of steam turbine |
| CN115977768A (en) * | 2023-01-04 | 2023-04-18 | 长城汽车股份有限公司 | Method and system for communicating urea nozzle, storage medium and vehicle |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296029A (en) * | 2019-06-28 | 2019-10-01 | 潍柴动力股份有限公司 | The detection method and device of snifting valve state |
| CN110296029B (en) * | 2019-06-28 | 2020-10-30 | 潍柴动力股份有限公司 | Method and device for detecting state of jet valve |
| CN111894715A (en) * | 2020-08-10 | 2020-11-06 | 上海星融汽车科技有限公司 | Blockage detection method and system for SCR tail gas treatment system nozzle and vehicle |
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| CN112031903B (en) * | 2020-09-10 | 2021-04-02 | 上海星融汽车科技有限公司 | Fault diagnosis method for SCR urea injection device |
| CN112523847A (en) * | 2020-10-27 | 2021-03-19 | 广西玉柴机器股份有限公司 | Method for diagnosing urea consumption deviation based on pump pressure |
| CN112648058B (en) * | 2021-01-04 | 2022-02-18 | 东风汽车股份有限公司 | Urea injection device of engine SCR system and fault diagnosis method thereof |
| CN112648058A (en) * | 2021-01-04 | 2021-04-13 | 东风汽车股份有限公司 | Urea injection device of engine SCR system and fault diagnosis method thereof |
| CN112879134A (en) * | 2021-01-25 | 2021-06-01 | 凯龙高科技股份有限公司 | Non-air-assisted urea nozzle blockage diagnosis and self-repair control device and method |
| CN112879135A (en) * | 2021-01-25 | 2021-06-01 | 凯龙高科技股份有限公司 | Device and method for diagnosing urea consumption of non-air-assisted urea pump |
| CN113236405A (en) * | 2021-06-08 | 2021-08-10 | 潍柴动力股份有限公司 | Fault diagnosis method and device for urea injection system |
| CN113236405B (en) * | 2021-06-08 | 2022-08-23 | 潍柴动力股份有限公司 | Fault diagnosis method and device for urea injection system |
| CN113551699A (en) * | 2021-09-17 | 2021-10-26 | 山东德仕化工有限公司 | Method and equipment for detecting blockage of oil well pipeline |
| CN113551699B (en) * | 2021-09-17 | 2022-01-11 | 山东德仕化工有限公司 | Method and equipment for detecting blockage of oil well pipeline |
| CN114087037A (en) * | 2021-10-20 | 2022-02-25 | 中广核核电运营有限公司 | State detection method and system for low-pressure cylinder spraying device of steam turbine |
| CN114087037B (en) * | 2021-10-20 | 2023-06-02 | 中广核核电运营有限公司 | State detection method and system for low-pressure cylinder spray device of steam turbine |
| CN115977768A (en) * | 2023-01-04 | 2023-04-18 | 长城汽车股份有限公司 | Method and system for communicating urea nozzle, storage medium and vehicle |
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