CN115306518B - Urea injection control method based on diesel quality - Google Patents
Urea injection control method based on diesel quality Download PDFInfo
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- CN115306518B CN115306518B CN202211126976.4A CN202211126976A CN115306518B CN 115306518 B CN115306518 B CN 115306518B CN 202211126976 A CN202211126976 A CN 202211126976A CN 115306518 B CN115306518 B CN 115306518B
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- 238000002347 injection Methods 0.000 title claims abstract description 91
- 239000007924 injection Substances 0.000 title claims abstract description 91
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000004202 carbamide Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000446 fuel Substances 0.000 claims abstract description 53
- 238000012544 monitoring process Methods 0.000 claims abstract description 22
- 239000003054 catalyst Substances 0.000 claims abstract description 16
- 239000002828 fuel tank Substances 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 230000015556 catabolic process Effects 0.000 claims description 6
- 238000006731 degradation reaction Methods 0.000 claims description 6
- 239000002283 diesel fuel Substances 0.000 claims 1
- 230000002040 relaxant effect Effects 0.000 claims 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 19
- 229910021529 ammonia Inorganic materials 0.000 abstract description 9
- 238000011217 control strategy Methods 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 35
- 231100000572 poisoning Toxicity 0.000 description 5
- 230000000607 poisoning effect Effects 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 206010008428 Chemical poisoning Diseases 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- 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
- 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]
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- 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
-
- 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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a urea injection control method based on diesel quality, which comprises the following steps: the method comprises the steps of monitoring the fuel quality in a fuel tank in real time through a vehicle electronic control unit and sending information whether the fuel quality meets the standard or not to a urea injection system control unit; after receiving the information, the control unit of the urea injection system works according to the existing control logic if the fuel quality meets the standard, and adjusts the urea injection quantity and calculates the SCR efficiency on the basis of the existing control logic if the fuel quality does not meet the standard; the invention adds a control method for SCR efficiency monitoring and urea injection quantity adjustment according to fuel quality on the basis of the existing control strategy of a urea injection system to achieve the aim of quickly detecting whether an SCR catalyst is degraded or not, thereby preventing ammonia leakage caused by over-injection of urea and feeding back fault information in time.
Description
Technical field:
the invention belongs to the field of automobile exhaust emission control, and relates to a urea injection control method based on diesel quality.
The background technology is as follows:
Nitrogen oxides (NOx) are one of the main emissions in diesel engines, selective Catalytic Reduction (SCR) is the most effective method for controlling the emissions, and is currently the most mainstream technology on engines, and the main principle is that a urea injection system injects urea solution into an SCR catalyst, and after urea is decomposed into ammonia (NH 3), NOx is degraded into harmless nitrogen and water.
In the actual use process of SCR, various factors such as aging, high-temperature inactivation, crystallization, chemical poisoning and the like can appear along with the increase of the use mileage, so that the conversion efficiency of the catalyst is reduced. The catalyst is rapidly deteriorated in a short time due to poisoning caused by filling inferior fuel oil into the vehicle, and the original conversion capability cannot be recovered, so that decomposed ammonia gas cannot react with NOx, and the pollution to the environment is aggravated. At present, partial non-normal gas stations still exist in China, and the fuel quality of the fuel stations cannot be guaranteed, so that the situation of 'poisoning' of a catalyst frequently occurs in the market.
A urea injection system control unit (DCU) calculates urea injection quantity according to exhaust gas flow, temperature, NOx concentration and the like of an engine, and monitors conversion efficiency of the SCR catalyst according to upstream and downstream NOx concentrations. In order to prevent erroneous judgment of DCU, conditions for SCR efficiency monitoring are often strict, and judgment needs to be performed only when conditions such as SCR temperature, exhaust gas flow rate, NOx concentration and the like meet the requirements, and the judgment time is long, and normal urea injection is maintained until it is judged that SCR efficiency is reduced. The DCU can not monitor the fuel quality, so that the control method can not timely and effectively prevent the rapid and rapid degradation of the efficiency of the SCR catalyst caused by 'poisoning'.
Therefore, there is a need for a urea injection control method that can quickly identify the reduction in efficiency and prevent a large amount of ammonia slip from occurring due to urea overspray due to SCR catalyst "poisoning" caused by poor fuel injection.
The invention comprises the following steps:
Aiming at the defects existing in the prior art, the embodiment of the invention aims to provide a urea injection control method based on diesel quality, which can quickly identify the reduction of efficiency and prevent a large amount of ammonia leakage caused by urea overspray.
In order to achieve the above purpose, the present invention provides the following technical solutions:
A urea injection control method based on diesel quality comprises the following steps:
The method comprises the steps of monitoring the fuel quality in a fuel tank in real time through a vehicle electronic control unit and sending information whether the fuel quality meets the standard or not to a urea injection system control unit;
After receiving the information, the control unit of the urea injection system works according to the existing control logic if the fuel quality meets the standard, and adjusts the urea injection quantity and calculates the SCR efficiency on the basis of the existing control logic if the fuel quality does not meet the standard;
and adjusting the urea injection quantity in real time according to the SCR efficiency until the normal injection is restored.
As a further scheme of the invention, if the fuel quality does not reach the standard, the calculated urea injection quantity is reduced according to a certain proportion on the basis of the existing control logic.
As a further scheme of the invention, if the fuel quality does not reach the standard, the relevant conditions for monitoring the SCR efficiency are simultaneously relaxed, wherein the monitored conditions include: and comparing the calculated SCR efficiency with the conversion efficiency of a normal SCR catalyst under the same-proportion urea injection quantity, if the efficiency is normal, increasing the urea injection quantity, and monitoring the conversion efficiency under the injection quantity until the normal injection is restored.
As a further aspect of the present invention, the SCR efficiency is an average conversion efficiency of the SCR over a period of time calculated from the upstream and downstream NOx concentrations.
As a further aspect of the present invention, if the calculated SCR efficiency is lower than the normal SCR efficiency, the urea injection is gradually decreased until the injection is stopped, indicating that the fuel quality at this time causes the SCR to deteriorate.
As a further aspect of the present invention, the fuel quality is monitored by a fuel quality sensor disposed in the fuel tank.
As a further scheme of the invention, the urea injection system control unit feeds back the information of the monitored SCR conversion efficiency to the vehicle electronic control unit, and the vehicle electronic control unit feeds back the information to the driver through an instrument.
As a further scheme of the invention, the concentration of the upstream NOx and the downstream NOx are respectively the concentration of the air inlet end and the air outlet end of the SCR catalyst.
The invention has the following beneficial effects: the invention adds a control method for SCR efficiency monitoring and urea injection quantity adjustment according to fuel quality on the basis of the existing urea injection system control strategy, monitors the diesel quality through a vehicle Electronic Control Unit (ECU), and transmits signals to a DCU. When the DCU receives a signal that the fuel quality does not reach the standard, the urea injection quantity is reduced in time, and meanwhile, the strategy of SCR efficiency monitoring is adjusted, so that the purpose of rapidly detecting whether an SCR catalyst is deteriorated is achieved, ammonia leakage caused by urea overspray is prevented, and fault information is fed back in time.
In order to more clearly illustrate the structural features and efficacy of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and examples.
Description of the drawings:
FIG. 1 is a schematic diagram of a control flow of a urea injection control method based on diesel quality.
The specific embodiment is as follows:
The invention will be further described in the following clear and complete description with reference to the figures and the associated knowledge, it being evident that the described applications are only some, but not all embodiments of the invention.
Referring to fig. 1, a urea injection control method based on diesel quality includes the steps of:
The method comprises the steps of monitoring the fuel quality in a fuel tank in real time through a vehicle electronic control unit and sending information whether the fuel quality meets the standard or not to a urea injection system control unit;
After receiving the information, the control unit of the urea injection system works according to the existing control logic if the fuel quality meets the standard, and adjusts the urea injection quantity and calculates the SCR efficiency on the basis of the existing control logic if the fuel quality does not meet the standard;
and adjusting the urea injection quantity in real time according to the SCR efficiency until the normal injection is restored.
The method comprises the following steps: the vehicle Electronic Control Unit (ECU) monitors the fuel quality in the fuel tank in real time, and sends the information of whether the fuel quality reaches the standard to the urea injection system control unit (DCU) through the CAN bus.
After the DCU receives the information, if the fuel quality reaches the standard, the DCU works according to the existing control logic; if the fuel quality does not reach the standard, the calculated urea injection quantity is reduced according to a certain proportion on the basis of the existing control logic, meanwhile, the relevant conditions (temperature, exhaust flow and NOx concentration) for SCR efficiency monitoring are relaxed, the judging period is shortened, and the SCR efficiency is rapidly judged. And then comparing the calculated SCR efficiency with the normal (urea injection quantity with the same proportion) SCR efficiency, and if the efficiency is normal, increasing the urea injection quantity step by step proportionally until the normal injection is restored, so that the fuel at the moment cannot cause the SCR to be degraded. If the calculated SCR efficiency is lower than the normal SCR efficiency, the urea injection is gradually reduced until the injection is stopped, which indicates that the fuel quality at the moment causes the degradation of the SCR. At the same time, the DCU feeds this information back to the ECU, which feeds it back to the driver via the meter.
After the fuel oil meeting the requirements is refilled, the urea injection system resumes normal injection;
The invention can adjust the calculated urea injection quantity according to a certain proportion on the basis of the existing control logic according to the fuel quality, and the specific adjustment mode is as follows: if the fuel quality reaches the standard, working according to the existing control logic; if the fuel quality does not reach the standard, the calculated urea injection quantity is reduced according to a certain proportion on the basis of the existing control logic, meanwhile, the relevant conditions (temperature, exhaust flow and NOx concentration) for SCR efficiency monitoring are relaxed, the judging period is shortened, and the SCR efficiency is rapidly judged. Then, comparing the calculated SCR efficiency with normal (urea injection quantity with the same proportion) SCR efficiency, if the efficiency is normal, increasing the urea injection quantity step by step in proportion until normal injection is restored, and indicating that the fuel at the moment cannot cause SCR degradation; a closed loop control process is formed.
The control method makes up for partial logic blank of the existing urea injection system aiming at SCR efficiency monitoring and urea injection. In the existing control logic, calculation and monitoring are mainly performed aiming at the real-time conversion efficiency of SCR, and the system control method adds factors of fuel quality which can cause the reduction of SCR efficiency into a monitoring and calculating logic range, so that the reduction of SCR conversion efficiency can be monitored in advance, and the urea injection quantity is reduced in advance, thereby effectively preventing ammonia leakage and reducing the pollution of vehicles to the environment.
The following provides a specific example
Example 1
Referring to fig. 1, a urea injection control method based on diesel quality includes the steps of: the vehicle Electronic Control Unit (ECU) monitors the fuel quality in the fuel tank in real time, and sends the information of whether the fuel quality reaches the standard to the urea injection system control unit (DCU) through the CAN bus. The DCU adjusts the urea injection and the monitoring of SCR efficiency according to the received information:
if the fuel quality reaches the standard, working according to the existing control logic;
And if the fuel quality does not reach the standard, reducing the calculated urea injection quantity according to a certain proportion on the basis of the existing control logic. At the same time, the relevant conditions (temperature, exhaust flow, NOx concentration) monitored for SCR efficiency are relaxed, and the average conversion efficiency of the SCR over a period of time is calculated from the upstream and downstream NOx concentrations.
SCR conversion efficiency = (upstream NOx concentration-downstream NOx concentration)/upstream NOx concentration × 100%
And then, comparing the calculated SCR efficiency with the conversion efficiency of the normal SCR catalyst under the same-proportion urea injection quantity.
If the efficiency is normal, increasing the urea injection quantity, and monitoring the conversion efficiency under the injection quantity until the normal injection is restored. Indicating that the fuel at this time does not cause SCR degradation.
If the calculated SCR efficiency is lower than the normal SCR efficiency, the urea injection is gradually reduced until the injection is stopped, which indicates that the fuel quality at the moment causes the degradation of the SCR.
The DCU feeds back the monitored SCR conversion efficiency information to the ECU, which feeds back to the driver through the meter.
And after the fuel oil meeting the requirements is refilled, the urea injection system resumes normal injection.
And the relation between the control of the ammonia injection amount and the real-time monitoring of the fuel quality. The invention carries out real-time feedback regulation control on the ammonia injection quantity and the fuel quality. According to the invention, the DCU adjusts the monitoring of urea injection and SCR efficiency through the fuel quality information transmitted by the ECU, if the fuel quality is not in accordance with the requirement, the conversion efficiency of the SCR catalyst is easily reduced due to 'poisoning', and the DCU prevents the pollution of ammonia leakage to the environment by reducing the urea injection mode; meanwhile, the related conditions of SCR efficiency monitoring are released, the purpose of rapidly judging whether the SCR catalyst is deteriorated is achieved, and the information is fed back to a driver through the ECU in time, so that further deterioration of vehicle emission is prevented.
The technical principle of the present invention has been described above in connection with specific embodiments, but is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. Other embodiments of the invention will occur to those skilled in the art without the exercise of inventive effort and are intended to fall within the scope of the invention.
Claims (4)
1. The urea injection control method based on the diesel quality is characterized by comprising the following steps of:
The method comprises the steps of monitoring the fuel quality in a fuel tank in real time through a vehicle electronic control unit and sending information whether the fuel quality meets the standard or not to a urea injection system control unit;
After receiving the information, the control unit of the urea injection system works according to the existing control logic if the fuel quality meets the standard, and adjusts the urea injection quantity and calculates the SCR efficiency on the basis of the existing control logic if the fuel quality does not meet the standard;
And adjusting the urea injection quantity in real time according to the SCR efficiency until normal injection is restored, and if the fuel quality does not reach the standard, reducing the calculated urea injection quantity according to a certain proportion on the basis of the existing control logic, and simultaneously relaxing the related conditions for monitoring the SCR efficiency, wherein the monitored conditions comprise: and comparing the calculated SCR efficiency with the conversion efficiency of a normal SCR catalyst under the same proportion of urea injection quantity, if the calculated SCR efficiency is normal, increasing the urea injection quantity, monitoring the conversion efficiency under the injection quantity until normal injection is restored, wherein the SCR efficiency is calculated according to the concentration of NOx at the upstream and downstream for a period of time, if the calculated SCR efficiency is lower than the normal SCR efficiency, gradually reducing the urea injection until the injection is stopped, and indicating that the fuel quality at the moment leads to the degradation of the SCR.
2. A method for controlling urea injection based on diesel fuel quality according to claim 1, characterized in that the fuel quality is monitored by means of a fuel quality sensor arranged in the tank.
3. The urea injection control method based on the diesel quality according to claim 2, characterized in that the urea injection system control unit feeds back the information of the monitored SCR conversion efficiency to the vehicle electronic control unit, which feeds back to the driver via the meter.
4. A method for controlling urea injection based on diesel quality according to claim 3, characterized in that the upstream and downstream NOx concentrations are the concentrations of the SCR catalyst at the inlet and outlet end, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211126976.4A CN115306518B (en) | 2022-09-16 | 2022-09-16 | Urea injection control method based on diesel quality |
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| CN202211126976.4A CN115306518B (en) | 2022-09-16 | 2022-09-16 | Urea injection control method based on diesel quality |
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| CN115306518A CN115306518A (en) | 2022-11-08 |
| CN115306518B true CN115306518B (en) | 2024-05-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105556083A (en) * | 2013-09-25 | 2016-05-04 | 卡特彼勒Sarl | Cylinder head for an internal combustion engine |
| CN110242391A (en) * | 2019-06-28 | 2019-09-17 | 潍柴动力股份有限公司 | The exceeded reason of exhaust emissions determines method and apparatus |
| CN110646591A (en) * | 2019-12-02 | 2020-01-03 | 潍柴动力股份有限公司 | Fuel quality detection method and device, readable storage medium and electronic control unit |
| CN113864048A (en) * | 2021-09-28 | 2021-12-31 | 昆山三一动力有限公司 | High-sulfur oil identification processing method and device, vehicle and computer readable storage medium |
| CN114233504A (en) * | 2021-12-13 | 2022-03-25 | 潍柴动力股份有限公司 | NO (nitric oxide)xEmission control method and device |
-
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- 2022-09-16 CN CN202211126976.4A patent/CN115306518B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105556083A (en) * | 2013-09-25 | 2016-05-04 | 卡特彼勒Sarl | Cylinder head for an internal combustion engine |
| CN110242391A (en) * | 2019-06-28 | 2019-09-17 | 潍柴动力股份有限公司 | The exceeded reason of exhaust emissions determines method and apparatus |
| CN110646591A (en) * | 2019-12-02 | 2020-01-03 | 潍柴动力股份有限公司 | Fuel quality detection method and device, readable storage medium and electronic control unit |
| CN113864048A (en) * | 2021-09-28 | 2021-12-31 | 昆山三一动力有限公司 | High-sulfur oil identification processing method and device, vehicle and computer readable storage medium |
| CN114233504A (en) * | 2021-12-13 | 2022-03-25 | 潍柴动力股份有限公司 | NO (nitric oxide)xEmission control method and device |
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