CN112879129B - NH3 urea injection control method for quick storage under low-temperature working condition of SCR system - Google Patents
NH3 urea injection control method for quick storage under low-temperature working condition of SCR system Download PDFInfo
- Publication number
- CN112879129B CN112879129B CN202110096669.5A CN202110096669A CN112879129B CN 112879129 B CN112879129 B CN 112879129B CN 202110096669 A CN202110096669 A CN 202110096669A CN 112879129 B CN112879129 B CN 112879129B
- Authority
- CN
- China
- Prior art keywords
- deviation
- storage
- time
- injection
- calibration threshold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
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
- 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
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
-
- 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
- F01N2610/1486—Means to prevent the substance from freezing
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a low-temperature working condition fast NH3 urea storage injection control method of an SCR system, which is characterized in that when the exhaust temperature of an engine reaches a set low-temperature working condition, a controller switches different injection amount limit MAP according to NH3 storage deviation and time parameters to carry out fast NH3 storage. The invention effectively solves the contradiction between crystallization control and NOx efficiency control under the low-temperature working condition, and has higher NH3 storage speed and higher NOx conversion efficiency on the basis of ensuring smaller crystallization risk.
Description
Technical Field
The invention relates to the technical field of tail gas aftertreatment, in particular to a low-temperature working condition fast NH3 urea storage injection control method for an SCR system.
Background
With stricter and stricter emission regulations, the demand for SCR efficiency is also higher and higher. In the six-stage national emission regulation implementation stage, the traditional vanadium-based catalyst cannot be met particularly under the low-temperature working condition, so that copper-based molecular sieve catalysts are used in the catalysts of the six-stage national mainstream schemes SCR. By utilizing the low-temperature NH3 storage characteristic of the copper-based molecular sieve, the NOx conversion efficiency under the low-temperature working condition can be effectively improved, and further, the national six-emission regulations are met. Therefore, in order to improve the NOx conversion efficiency, it is necessary to ensure that a certain amount of NH3 is adsorbed in the catalyst under low temperature conditions while ensuring equivalent NH3 injection. Since NH3 is derived from the urea solution, if the urea solution always maintains a relatively high injection amount, especially under low temperature conditions, internal crystallization of the catalyst may be caused, and in a conventional scheme, the injection amount is strictly limited under all conditions, but in a model engine configuration, after the injection amount is strictly limited, NOx conversion efficiency cannot be guaranteed because the storage amount of NH3 cannot be guaranteed, and therefore, it is difficult to balance NOx efficiency and crystallization control.
The above problems are urgently needed to be solved.
Disclosure of Invention
The invention aims to solve the problems mentioned in the background technology part by using a method for controlling the injection of NH3 urea stored in an SCR system under the low-temperature working condition.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to the method, when the exhaust temperature of an engine reaches a set low-temperature working condition, a controller switches different injection amount limiting data (MAP) according to NH3 storage deviation and time parameters to rapidly store NH3.
Specifically, the controller switches different injection amount limit MAPs according to the NH3 storage deviation and the time parameter to perform rapid NH3 storage, and specifically includes:
the controller determines whether the NH3 storage deviation is above a deviation calibration threshold and if so, maintains activation of the first injection limit MAP.
Specifically, the controller determines whether the NH3 storage deviation is greater than a deviation calibration threshold, determines whether a two-time second injection limit MAP activation time interval is greater than a time calibration threshold if the deviation is greater than the deviation calibration threshold, and activates the second injection limit MAP2 if the deviation is greater than the deviation calibration threshold; if the time threshold is undershot, the first injection limit MAP remains activated.
Particularly, when the controller judges that the NH3 storage deviation is greater than the deviation calibration threshold and the interval time is greater than the time calibration threshold, whether the second injection limit MAP activation maintaining time is greater than a second time calibration threshold is judged, if the second injection limit MAP activation maintaining time is less than the second time calibration threshold, the second injection limit is maintained to be activated, and NH3 is rapidly stored; above the second time scaling threshold, the first injection limit MAP is activated.
Compared with the traditional injection amount limiting scheme, the SCR system low-temperature working condition fast NH3 storage urea injection control method provided by the invention has the advantages that when the exhaust temperature of the engine reaches the set low-temperature working condition, the controller switches different injection amount limiting MAP according to NH3 storage deviation and time parameters to carry out fast NH3 storage, the contradiction between crystallization control and NOx efficiency control under the low-temperature working condition is effectively solved, and the NOx conversion efficiency is effectively improved on the basis of ensuring that the crystallization risk is smaller.
Drawings
FIG. 1 is a flowchart of a method for controlling NH3 urea injection of an SCR system under low-temperature conditions according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It is also to be noted that, for the convenience of description, only a part of the contents, not all of the contents, which are related to the present invention, are shown in the drawings, and unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, fig. 1 is a flowchart of a method for controlling NH3 urea injection under a low-temperature operating condition of an SCR system according to an embodiment of the present invention, where a calibration threshold 1 refers to a deviation calibration threshold, a calibration threshold 2 refers to a time calibration threshold, a calibration threshold 3 refers to a second time calibration threshold, an injection amount limit MAP1 refers to a first injection limit MAP, and an injection amount limit MAP2 refers to a second injection limit MAP.
The NH3 urea injection control method for the SCR system under the low-temperature working condition in the embodiment comprises the following steps: when the exhaust temperature of the engine reaches a set low-temperature working condition, the controller switches different injection amount limiting data (MAP) according to NH3 storage deviation and time parameters to rapidly store NH3.
Specifically, in this embodiment, the controller switches different injection amount limit MAPs according to the NH3 storage deviation and the time parameter, and performs fast NH3 storage, specifically including: the controller determines whether the NH3 storage deviation is above a deviation calibration threshold and if so, maintains activation of the first injection limit MAP.
Specifically, in this embodiment, the controller determines whether the NH3 storage deviation is greater than a deviation calibration threshold, determines whether the two-time second injection limit MAP activation time interval is greater than a time calibration threshold if the deviation is greater than the deviation calibration threshold, and activates the second injection limit MAP2 if the deviation is greater than the deviation calibration threshold; if the time calibration threshold is undershot, the first injection limit MAP is maintained active.
Specifically, in this embodiment, when the controller determines that the NH3 storage deviation is greater than the deviation calibration threshold and the interval time is greater than the time calibration threshold, it is determined whether the second injection limit MAP activation maintaining time is greater than the second time calibration threshold, and if the second injection limit MAP activation maintaining time is less than the second time calibration threshold, the second injection limit MAP activation is maintained, and the NH3 is rapidly stored; above the second time scaling threshold, the first injection limit MAP is activated.
Compared with the traditional injection amount limiting scheme, the technical scheme provided by the invention has the advantages that when the exhaust temperature of the engine reaches the set low-temperature working condition, the controller switches different injection amount limiting MAP according to NH3 storage deviation and time parameters to rapidly store NH3, so that the contradiction between crystallization control and NOx efficiency control under the low-temperature working condition is effectively solved, and the NOx conversion efficiency is effectively improved on the basis of ensuring smaller crystallization risk.
It will be understood by those skilled in the art that all or part of the above embodiments may be implemented by the computer program to instruct the relevant hardware, and the program may be stored in a computer readable storage medium, and when executed, may include the procedures of the embodiments of the methods as described above. The storage medium can be a magnetic disk, an optical disk, a read-only memory or a random access memory.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (2)
1. A method for controlling NH3 urea injection of an SCR system under a low-temperature working condition is characterized in that when the exhaust temperature of an engine reaches a set low-temperature working condition, a controller switches different injection amount limit MAP according to NH3 storage deviation and time parameters to carry out NH3 rapid storage;
the controller switches different injection amount limit MAP according to NH3 storage deviation and time parameters to rapidly store NH3, and specifically comprises:
the controller judges whether the NH3 storage deviation is higher than a deviation calibration threshold value or not, and if the NH3 storage deviation is lower than the deviation calibration threshold value, the first injection limit MAP is kept activated;
the controller judges whether the NH3 storage deviation is higher than a deviation calibration threshold value, if so, judges whether the second injection limit MAP activation time interval is higher than a time calibration threshold value for two times, and if so, activates the second injection limit MAP; if the time calibration threshold is undershot, the first injection limit MAP is maintained active.
2. The SCR system low-temperature condition fast NH3 urea storage injection control method of claim 1, wherein when the controller determines that the NH3 storage deviation is greater than the deviation calibration threshold and the interval time is greater than the time calibration threshold, it determines whether the second injection limit MAP activation maintenance time is greater than a second time calibration threshold, and if the second injection limit MAP activation maintenance time is less than the second time calibration threshold, the second injection limit MAP is maintained to be activated to store NH3 fast; above the second time calibration threshold, the first injection limit MAP is activated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110096669.5A CN112879129B (en) | 2021-01-25 | 2021-01-25 | NH3 urea injection control method for quick storage under low-temperature working condition of SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110096669.5A CN112879129B (en) | 2021-01-25 | 2021-01-25 | NH3 urea injection control method for quick storage under low-temperature working condition of SCR system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112879129A CN112879129A (en) | 2021-06-01 |
| CN112879129B true CN112879129B (en) | 2022-10-21 |
Family
ID=76050969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110096669.5A Active CN112879129B (en) | 2021-01-25 | 2021-01-25 | NH3 urea injection control method for quick storage under low-temperature working condition of SCR system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112879129B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483266A (en) * | 2022-02-18 | 2022-05-13 | 潍柴动力股份有限公司 | SCR urea injection control method and urea injection system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4215808B2 (en) * | 2007-05-11 | 2009-01-28 | ボッシュ株式会社 | Control device and control method for exhaust gas purification device, and exhaust gas purification device for internal combustion engine |
| JP5232613B2 (en) * | 2008-12-08 | 2013-07-10 | 三菱重工業株式会社 | Exhaust gas purification device |
| US9512764B2 (en) * | 2013-07-11 | 2016-12-06 | Ford Global Technologies, Llc | Ammonia storage management for SCR catalyst |
| GB2549716A (en) * | 2016-04-25 | 2017-11-01 | Gm Global Tech Operations Llc | A method for controlling an injector for injecting a reductant into an exhaust system of an internal combustion engine |
| CN106837497B (en) * | 2017-02-24 | 2020-02-14 | 天津大学 | Diesel engine catalytic reduction urea injection control method based on real-time ammonia storage amount management |
| JP7115334B2 (en) * | 2019-01-23 | 2022-08-09 | いすゞ自動車株式会社 | Exhaust purification device for internal combustion engine and vehicle |
| CN111749765B (en) * | 2020-07-15 | 2021-07-20 | 潍柴动力股份有限公司 | Urea injection control method and device and aftertreatment system |
-
2021
- 2021-01-25 CN CN202110096669.5A patent/CN112879129B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112879129A (en) | 2021-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112879129B (en) | NH3 urea injection control method for quick storage under low-temperature working condition of SCR system | |
| CN1817414A (en) | Controlling lean NOx trap (LNT) catalyst performance | |
| CN113279849B (en) | NH3 leakage identification and detection method for SCR system | |
| US10054020B2 (en) | Exhaust purification control device for internal combustion engine | |
| CN114060131B (en) | Diesel engine emission control method and device, diesel engine vehicle and medium | |
| WO2020062865A1 (en) | CONTROL METHOD AND SYSTEM FOR SCR DOWNSTREAM NOₓ CLOSED-LOOP PROCESS | |
| CN109339911B (en) | Control method and system for improving SCR urea crystallization or conversion efficiency reduction | |
| US20120067028A1 (en) | Aftertreatment catalyst degradation compensation | |
| CN111677579B (en) | Urea injection control method and device and electronic equipment | |
| CN116085097A (en) | Vehicle aftertreatment system control method and device, storage medium and vehicle | |
| CN115016571B (en) | Temperature control method and device of CCSCR (semiconductor control rectifier) equipment, vehicle and storage medium | |
| CN113513421B (en) | Vehicle thermal management control method, device, equipment, medium and product | |
| JP2014218918A (en) | Control apparatus for internal combustion engine | |
| CN113756918B (en) | Engine control method, engine control device and vehicle | |
| CN114991915A (en) | Control method for improving vehicle economy based on urea and fuel price change | |
| CN111140319B (en) | Desulfurization control method and device, storage medium and electronic equipment | |
| CN114607490A (en) | Engine mode adjusting method and device, electronic equipment and storage medium | |
| CN110987440A (en) | SCR catalyst NH3 storage test method | |
| CN117489452A (en) | Recovery control method for HC and S poisoning of two-stage SCR system | |
| EP2927446B1 (en) | Exhaust purifying apparatus for internal combustion engine | |
| CN118008538A (en) | Catalyst control method, catalyst and device for self-adaptive working scene | |
| CN117759412B (en) | Three-way catalyst control method and device, storage medium and electronic equipment | |
| CN116378837B (en) | Chemical waste elimination method, chemical waste elimination device, computer equipment and storage medium | |
| CN112879134A (en) | Non-air-assisted urea nozzle blockage diagnosis and self-repair control device and method | |
| CN115773172B (en) | HC poisoning judgment method and device in SCR system, electronic equipment and medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |