CN110905637A - Real-time detection reminding method for working efficiency of SCR system catalyst - Google Patents
Real-time detection reminding method for working efficiency of SCR system catalyst Download PDFInfo
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- CN110905637A CN110905637A CN201911189791.6A CN201911189791A CN110905637A CN 110905637 A CN110905637 A CN 110905637A CN 201911189791 A CN201911189791 A CN 201911189791A CN 110905637 A CN110905637 A CN 110905637A
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- nitrogen
- oxygen concentration
- concentration sensor
- working efficiency
- catalyst
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- 239000003054 catalyst Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000011897 real-time detection Methods 0.000 title claims abstract description 7
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 27
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 7
- 239000004202 carbamide Substances 0.000 description 7
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 229940110728 nitrogen / oxygen Drugs 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
-
- 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
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
A method for reminding real-time detection of working efficiency of a catalyst of an SCR system comprises the following steps: a first nitrogen-oxygen concentration sensor is arranged at an exhaust gas inlet of the SCR catalyst, a second nitrogen-oxygen concentration sensor is arranged at an exhaust gas outlet of the SCR catalyst, and the first nitrogen-oxygen concentration sensor and the second nitrogen-oxygen concentration sensor are both connected with an engine ECU (electronic control Unit); judging the working efficiency of the SCR catalyst according to the detection values of the first nitrogen-oxygen concentration sensor and the second nitrogen-oxygen concentration sensor; and when the SCR catalyst is at the warning working efficiency, reminding a driver through the vehicle-mounted terminal. The invention can send out corresponding reminding when the efficiency of the SCR catalyst reaches the warning value, so that a driver can process the catalyst in time when the working efficiency of the catalyst reaches the warning value, the working efficiency of the catalyst is improved, and the situations of standard exceeding of emission concentration, torque limitation of an ECU (electronic control unit) and the like are avoided.
Description
Technical Field
The invention belongs to the technical field of SCR systems, and particularly relates to a method for detecting and reminding the working efficiency of a catalyst of an SCR system in real time.
Background
The post-treatment of the tail gas by a diesel vehicle SCR (Selective Catalytic Reduction) system is a treatment process aiming at NOx in the tail gas discharged by a diesel vehicle, namely, a reducing agent ammonia or urea is injected under the action of a catalyst to reduce the NOx in the tail gas into N2 and H2O.
The technology is widely applied to the post-treatment of the tail gas of the diesel engine, the generation of particulate matter PM is controlled as much as possible in the engine by optimizing the oil injection and combustion processes, then the nitrogen oxide formed under the oxygen-rich condition is treated outside the engine, and the selective catalytic reduction is carried out on the nitrogen oxide (NOx) by using the vehicle urea (the vehicle urea is decomposed at a certain temperature to generate ammonia) in time, so that the aims of saving energy and reducing emission are fulfilled.
The basic working principle of the SCR system is: the tail gas enters an exhaust mixing pipe after coming out of the turbine, a urea metering and spraying device is installed on the mixing pipe and sprays urea aqueous solution to the tail gas, urea generates NH3 after hydrolysis and pyrolysis reaction at high temperature of the tail gas, then the tail gas enters an SCR (selective catalytic reduction) catalyst, NOx is reduced by NH3 under the catalytic action of the catalyst, N2 is discharged, and redundant NH3 is oxidized into N2 to prevent leakage. Typically, 5L of liquid urea aqueous solution is consumed along with 100L of fuel.
When the SCR catalyst is used for a long time, it may cause catalyst poisoning, thereby decreasing conversion efficiency. This can cause the concentration of NOx in the exhaust emissions to exceed the standard, affecting the environment. The engine ECU will limit the torque of the engine power accordingly (the throttle will be only half as effective) based on the SCR system feedback information, resulting in a reduction in vehicle operating efficiency.
Disclosure of Invention
Based on this, aiming at the technical problem, a method for detecting and reminding the working efficiency of the SCR system catalyst in real time is provided.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for reminding real-time detection of working efficiency of a catalyst of an SCR system comprises the following steps:
a first nitrogen-oxygen concentration sensor is arranged at an exhaust gas inlet of the SCR catalyst, a second nitrogen-oxygen concentration sensor is arranged at an exhaust gas outlet of the SCR catalyst, and the first nitrogen-oxygen concentration sensor and the second nitrogen-oxygen concentration sensor are both connected with an engine ECU (electronic control Unit);
and judging the working efficiency of the SCR catalyst according to the detection values of the first nitrogen-oxygen concentration sensor and the second nitrogen-oxygen concentration sensor:
when in use
When the SCR catalyst is used, the working efficiency of the SCR catalyst is good;
when in use
When the SCR catalyst is in warning working efficiency;
a and B are respectively detection values of the first nitrogen-oxygen concentration sensor and the second nitrogen-oxygen concentration sensor, and X is a preset threshold value of the working efficiency of the SCR catalyst;
and when the SCR catalyst is at the warning working efficiency, reminding a driver through the vehicle-mounted terminal.
And when the SCR catalyst is at the warning working efficiency, a warning lamp is lightened by an instrument panel to remind a driver.
And the first nitrogen-oxygen concentration sensor and the second nitrogen-oxygen concentration sensor are both connected with the engine ECU through a DCU.
The invention can send out corresponding reminding when the efficiency of the SCR catalyst reaches the warning value, so that a driver can process the catalyst in time when the working efficiency of the catalyst reaches the warning value, the working efficiency of the catalyst is improved, and the situations of standard exceeding of emission concentration, torque limitation of an ECU (electronic control unit) and the like are avoided.
Drawings
The invention is described in detail below with reference to the following figures and detailed description:
FIG. 1 is a flow chart of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1, a method for detecting and reminding the working efficiency of a catalyst of an SCR system in real time includes:
s101, as shown in fig. 2, a first nitrogen-oxygen concentration sensor 110 is provided at an exhaust gas inlet 21 of the SCR catalyst 20, an exhaust gas outlet 22 of the SCR catalyst 20 itself has a second nitrogen-oxygen concentration sensor 120, and both the first nitrogen-oxygen concentration sensor 110 and the second nitrogen-oxygen concentration sensor 120 are connected to the engine ECU 3.
In the present embodiment, first nitrogen oxygen concentration sensor 110 and second nitrogen oxygen concentration sensor 120 are both connected to engine ECU3 via DCU (Dosing Control Unit) 4.
S102, engine ECU3 determines the operating efficiency of SCR catalyst 20 from the detected values of first nitrogen oxide concentration sensor 110 and second nitrogen oxide concentration sensor 120:
when in use
When the operation is normal, the operating efficiency of the SCR catalyst 20 is good;
when in use
At this time, the SCR catalyst 20 is at the guard operating efficiency.
Where a and B are detection values of the first nitrogen/oxygen concentration sensor 110 and the second nitrogen/oxygen concentration sensor 120, respectively, and X is a nitrogen/oxygen reduction ratio threshold value.
S103, when the SCR catalyst is in warning working efficiency, a driver is reminded through the vehicle-mounted terminal.
In this embodiment, the warning light is turned on by the instrument panel to warn the driver.
According to the invention, a first nitrogen-oxygen concentration sensor 110 is additionally arranged at an exhaust gas inlet 21 of an SCR catalyst 20, the nitrogen-oxygen concentrations of exhaust gas before and after passing through the SCR catalyst 20 are detected by matching with an original second nitrogen-oxygen concentration sensor 120, then the concentration difference is calculated, the reduction ratio of nitrogen and oxygen when the exhaust gas passes through the SCR catalyst 20 is judged, and the working efficiency of the catalyst is calculated.
The invention can send out corresponding reminding when the efficiency of the SCR catalyst reaches the warning value, so that a driver can use the SCR cleaning machine to process the catalyst in time when the working efficiency of the catalyst reaches the warning value, thereby improving the working efficiency of the catalyst and avoiding the conditions of excessive emission concentration, ECU torque limit and the like.
However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.
Claims (3)
1. A method for reminding real-time detection of working efficiency of a catalyst of an SCR system is characterized by comprising the following steps:
a first nitrogen-oxygen concentration sensor is arranged at an exhaust gas inlet of the SCR catalyst, a second nitrogen-oxygen concentration sensor is arranged at an exhaust gas outlet of the SCR catalyst, and the first nitrogen-oxygen concentration sensor and the second nitrogen-oxygen concentration sensor are both connected with an engine ECU (electronic control Unit);
and judging the working efficiency of the SCR catalyst according to the detection values of the first nitrogen-oxygen concentration sensor and the second nitrogen-oxygen concentration sensor:
when in use
When the SCR catalyst is used, the working efficiency of the SCR catalyst is good;
when in use
When the SCR catalyst is in warning working efficiency;
a and B are respectively detection values of the first nitrogen-oxygen concentration sensor and the second nitrogen-oxygen concentration sensor, and X is a preset threshold value of the working efficiency of the SCR catalyst;
and when the SCR catalyst is at the warning working efficiency, reminding a driver through the vehicle-mounted terminal.
2. The method for reminding real-time detection of the operating efficiency of the SCR system catalyst as claimed in claim 1, wherein when the SCR catalyst is in the warning operating efficiency, a warning lamp is lighted up by an instrument panel to remind a driver.
3. The method for reminding real-time detection of the working efficiency of the SCR system catalyst as claimed in claim 1 or 2, wherein the first nitrogen-oxygen concentration sensor and the second nitrogen-oxygen concentration sensor are both connected with the engine ECU through a DCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911189791.6A CN110905637A (en) | 2019-11-28 | 2019-11-28 | Real-time detection reminding method for working efficiency of SCR system catalyst |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911189791.6A CN110905637A (en) | 2019-11-28 | 2019-11-28 | Real-time detection reminding method for working efficiency of SCR system catalyst |
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| Publication Number | Publication Date |
|---|---|
| CN110905637A true CN110905637A (en) | 2020-03-24 |
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| CN201911189791.6A Pending CN110905637A (en) | 2019-11-28 | 2019-11-28 | Real-time detection reminding method for working efficiency of SCR system catalyst |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810289A (en) * | 2021-06-10 | 2022-07-29 | 长城汽车股份有限公司 | Method and device for detecting state of SCR system, electronic equipment and vehicle |
| CN114837783A (en) * | 2021-06-18 | 2022-08-02 | 长城汽车股份有限公司 | LNT state detection method and device, electronic equipment and vehicle |
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| CN101988422A (en) * | 2009-07-30 | 2011-03-23 | 通用汽车环球科技运作公司 | Method and system for verifying the operation of an SCR catalyst |
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| CN107923291A (en) * | 2015-08-28 | 2018-04-17 | 斗山英维高株式会社 | Waste gas cleaning system and its monitoring method |
| CN108425730A (en) * | 2018-02-27 | 2018-08-21 | 西南交通大学 | The OBD of diesel SCR after-treatment system is diagnosed and processing method |
| CN108952901A (en) * | 2018-07-04 | 2018-12-07 | 中国汽车技术研究中心有限公司 | SCR catalyst aging modification method based on double NOx sensors |
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2019
- 2019-11-28 CN CN201911189791.6A patent/CN110905637A/en active Pending
Patent Citations (7)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810289A (en) * | 2021-06-10 | 2022-07-29 | 长城汽车股份有限公司 | Method and device for detecting state of SCR system, electronic equipment and vehicle |
| CN114837783A (en) * | 2021-06-18 | 2022-08-02 | 长城汽车股份有限公司 | LNT state detection method and device, electronic equipment and vehicle |
| CN114837783B (en) * | 2021-06-18 | 2023-09-29 | 长城汽车股份有限公司 | LNT state detection method and device, electronic equipment and vehicle |
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Application publication date: 20200324 |