CN115306518A - Urea injection control method based on diesel oil quality - Google Patents

Urea injection control method based on diesel oil quality Download PDF

Info

Publication number
CN115306518A
CN115306518A CN202211126976.4A CN202211126976A CN115306518A CN 115306518 A CN115306518 A CN 115306518A CN 202211126976 A CN202211126976 A CN 202211126976A CN 115306518 A CN115306518 A CN 115306518A
Authority
CN
China
Prior art keywords
urea injection
scr
fuel quality
efficiency
quality
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.)
Granted
Application number
CN202211126976.4A
Other languages
Chinese (zh)
Other versions
CN115306518B (en
Inventor
杨新春
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Hexia Jundao Intelligent Technology Co ltd
Original Assignee
Zhejiang Hexia Technology Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zhejiang Hexia Technology Co ltd filed Critical Zhejiang Hexia Technology Co ltd
Priority to CN202211126976.4A priority Critical patent/CN115306518B/en
Publication of CN115306518A publication Critical patent/CN115306518A/en
Application granted granted Critical
Publication of CN115306518B publication Critical patent/CN115306518B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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 oil quality, which comprises the following steps: the fuel quality in the fuel tank is monitored in real time through the vehicle electronic control unit, and the information whether the fuel quality reaches the standard is sent to the urea injection system control unit; after the urea injection system control unit receives the information, if the fuel quality reaches the standard, the urea injection system control unit works according to the existing control logic, and if the fuel quality does not reach the standard, the urea injection quantity is adjusted on the basis of the existing control logic and the SCR efficiency is calculated; the invention adjusts the urea injection quantity in real time according to the SCR efficiency until normal injection is recovered, and adds a control method for monitoring the SCR efficiency and adjusting the urea injection quantity according to the fuel quality on the basis of the existing urea injection system control strategy to achieve the purpose of quickly detecting whether an SCR catalyst is degraded or not, thereby preventing ammonia leakage caused by urea over-injection and feeding back fault information in time.

Description

Urea injection control method based on diesel oil quality
The technical field is as follows:
the invention belongs to the field of automobile exhaust emission control, and relates to a urea injection control method based on diesel oil quality.
Background art:
nitrogen oxide (NOx) is one of the main emissions in diesel engines, selective Catalyst Reduction (SCR) is the most effective method for controlling the emissions, and is also the most mainstream technology on the current engines, and the main principle is that a urea injection system injects urea solution into an SCR catalyst, and urea is decomposed into ammonia (NH) 3 ) And then degrading the NOx into harmless nitrogen and water.
During the actual use process of the SCR, various factors such as aging, high-temperature inactivation, crystallization, chemical poisoning and the like appear along with the increase of the use mileage, so that the conversion efficiency of the catalyst is reduced. Among them, the "poisoning" of the catalyst caused by the poor fuel injected into the vehicle can cause the catalyst to be rapidly deteriorated in a short time, and the original conversion capability cannot be recovered, so that the decomposed ammonia gas cannot react with NOx, and the environmental pollution is increased. At present, some irregular gas stations still exist in China, and the fuel quality of the gas stations cannot be guaranteed, so that the situation of poisoning of a catalyst often occurs in the market.
A urea injection system control unit (DCU) calculates urea injection quantity according to exhaust flow, temperature, NOx concentration and the like of an engine, and monitors conversion efficiency of the SCR catalyst according to the NOx concentration at the upstream and downstream of the SCR catalyst. In order to prevent the DCU from being erroneously determined, the SCR efficiency monitoring conditions are often relatively strict, and determination is performed only when the conditions such as the SCR temperature, the exhaust gas flow rate, and the NOx concentration satisfy the requirements, and the determination time is long, and the urea injection is maintained normally until the SCR efficiency is determined to be reduced. The DCU does not monitor the fuel quality, so the control method cannot timely and effectively prevent the condition of rapid and rapid efficiency degradation caused by poisoning of the SCR catalyst.
Therefore, there is a need for a urea injection control method that "poisons" the SCR catalyst by injecting poor fuel, quickly recognizes the decrease in efficiency thereof, and prevents a large amount of ammonia slip due to the over-injection of urea.
The invention content is as follows:
in view of the defects in the prior art, an object of the embodiments of the present invention is to provide a method for controlling urea injection based on diesel fuel quality, which can quickly identify the efficiency reduction and prevent a large amount of ammonia leakage due to urea over-injection.
In order to achieve the purpose, the invention provides the following technical scheme:
a urea injection control method based on diesel oil quality comprises the following steps:
the method comprises the following steps that the quality of fuel oil in an oil tank is monitored in real time through a vehicle electric control unit, and information about whether the quality of the fuel oil reaches the standard is sent to a urea injection system control unit;
after receiving the information, the urea injection system control unit works according to the existing control logic if the fuel quality reaches 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 reach the standard;
and adjusting the urea injection quantity in real time according to the SCR efficiency until normal injection is recovered.
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, relevant conditions for SCR efficiency monitoring are simultaneously relaxed, wherein the monitored conditions comprise: and comparing the calculated SCR efficiency with the conversion efficiency of a normal SCR catalyst under the urea injection amount in the same proportion by using the temperature, the exhaust flow and the NOx concentration, if the efficiency is normal, increasing the urea injection amount, and monitoring the conversion efficiency under the injection amount until normal injection is recovered.
As a further scheme of the invention, the SCR efficiency is the average conversion efficiency of SCR in a period of time calculated according to the NOx concentrations at the upstream and the downstream.
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 reduced until the injection is stopped, indicating that the fuel quality at this time causes the deterioration of the SCR.
As a further proposal of the invention, the fuel quality is monitored by a fuel quality sensor arranged in the fuel tank.
As a further scheme of the invention, the urea injection system control unit feeds back information of the monitored SCR conversion efficiency to the vehicle electronic control unit, and the vehicle electronic control unit feeds back the information to a driver through an instrument.
As a further aspect of the present invention, the NOx concentrations at the upstream and downstream are concentrations at an inlet end and an outlet end of the SCR catalyst, respectively.
The invention has the following beneficial effects: the invention adds a control method for monitoring SCR efficiency and adjusting urea injection quantity according to fuel quality on the basis of the existing control strategy of a urea injection system, monitors the diesel quality through a vehicle Electronic Control Unit (ECU), and transmits signals to a DCU (distributed control Unit). When the DCU receives a signal that the fuel quality does not reach the standard, the urea injection amount is reduced in time, and meanwhile the strategy of SCR efficiency monitoring is adjusted, so that the purpose of rapidly detecting whether the SCR catalyst is degraded or not is achieved, ammonia leakage caused by urea over-injection is prevented, and fault information is fed back in time.
To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Description of the drawings:
FIG. 1 is a schematic control flow chart of a diesel fuel quality-based urea injection control method provided by the invention.
The specific implementation mode is as follows:
the invention will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown.
Referring to fig. 1, a method for controlling urea injection based on diesel fuel quality includes the following steps:
the method comprises the following steps that the quality of fuel oil in an oil tank is monitored in real time through a vehicle electric control unit, and information about whether the quality of the fuel oil reaches the standard is sent to a urea injection system control unit;
after receiving the information, the urea injection system control unit works according to the existing control logic if the fuel quality reaches 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 reach the standard;
and adjusting the urea injection quantity in real time according to the SCR efficiency until normal injection is recovered.
The method specifically 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 whether the fuel quality reaches the standard to a urea injection system control unit (DCU) through a CAN bus by judging.
After receiving the information, the DCU works according to the existing control logic if the fuel quality reaches the standard; 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, relevant conditions (temperature, exhaust flow and NOx concentration) for SCR efficiency monitoring are relaxed, the judgment period is shortened, and the efficiency of SCR is quickly judged. Then, the calculated SCR efficiency is compared with the normal (urea injection quantity in the same proportion) SCR efficiency, if the efficiency is normal, the urea injection quantity is increased proportionally and gradually until normal injection is recovered, and the fact that the fuel at the moment can not cause SCR degradation is shown. 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 quality of the fuel at this time causes the SCR to be degraded. Meanwhile, the DCU feeds the information back to the ECU, and the ECU feeds the information back to a driver through an instrument.
When the fuel meeting the requirements is refilled, the urea injection system recovers 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, relevant conditions (temperature, exhaust flow and NOx concentration) for monitoring the SCR efficiency are relaxed, the judgment period is shortened, and the efficiency of the SCR is quickly judged. Then, comparing the calculated SCR efficiency with the normal (urea injection quantity in the same proportion) SCR efficiency, and if the efficiency is normal, gradually increasing the urea injection quantity in proportion until normal injection is recovered, which indicates that the SCR cannot be degraded by the fuel at the moment; 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, the real-time conversion efficiency of SCR is mainly calculated and monitored, the system control method adds the factors of fuel quality which can cause the reduction of the SCR efficiency into the monitoring and calculation logic range, the reduction of the SCR conversion efficiency can be monitored in advance, and the urea injection amount is reduced in advance, so that ammonia leakage is effectively prevented, and the pollution of vehicles to the environment is reduced.
A specific example is provided below
Example 1
Referring to fig. 1, a method for controlling urea injection based on diesel fuel quality includes the following steps: the vehicle Electronic Control Unit (ECU) monitors the fuel quality in the fuel tank in real time, and sends the information whether the fuel quality reaches the standard to a urea injection system control unit (DCU) through a CAN bus by judging. The DCU adjusts the monitoring of urea injection and SCR efficiency based on 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. Meanwhile, relevant conditions (temperature, exhaust flow rate, NOx concentration) for SCR efficiency monitoring are relaxed, and the average conversion efficiency of SCR in a period of time is calculated according to the NOx concentrations at the upstream and downstream.
SCR conversion efficiency = (upstream NOx concentration-downstream NOx concentration)/upstream NOx concentration 100%
Then, the calculated SCR efficiency is compared with the conversion efficiency of a normal SCR catalyst under the same proportion of urea injection amount.
If the efficiency is normal, the urea injection amount is increased, and the conversion efficiency at the injection amount is monitored until the normal injection is resumed. 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 quality of the fuel at this time causes the SCR to be degraded.
The DCU feeds back the information of the SCR conversion efficiency to the ECU, and the ECU feeds back the information to a driver through an instrument.
And when the fuel meeting the requirements is refilled, the urea injection system recovers normal injection.
The relation between the control of ammonia injection amount and the real-time monitoring of fuel quality. The invention carries out real-time feedback regulation control on the ammonia injection amount 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 does not meet the requirement, the SCR catalyst is easy to reduce the conversion efficiency due to poisoning, and the DCU prevents the pollution of ammonia leakage to the environment through reducing the urea injection mode; meanwhile, relevant conditions for monitoring the SCR efficiency are released, the purpose of quickly judging whether the SCR catalyst is degraded or not is achieved, and the SCR catalyst 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 with reference to specific embodiments, which are merely preferred embodiments 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 idea 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 faculty, and such will fall within the scope of the invention.

Claims (8)

1. A urea injection control method based on diesel oil quality is characterized by comprising the following steps:
the method comprises the following steps that the quality of fuel oil in an oil tank is monitored in real time through a vehicle electric control unit, and information about whether the quality of the fuel oil reaches the standard is sent to a urea injection system control unit;
after receiving the information, the urea injection system control unit works according to the existing control logic if the fuel quality reaches 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 reach the standard;
and adjusting the urea injection quantity in real time according to the SCR efficiency until normal injection is recovered.
2. A method of controlling urea injection based on diesel fuel quality as claimed in claim 1, wherein if the fuel quality does not meet the predetermined standard, the calculated urea injection amount is reduced in a certain ratio based on the existing control logic.
3. A method for controlling urea injection based on diesel fuel quality as claimed in claim 2, characterized by simultaneously relaxing relevant conditions for SCR efficiency monitoring if the fuel quality is not met, wherein the monitored conditions include: and comparing the calculated SCR efficiency with the conversion efficiency of a normal SCR catalyst under the urea injection amount in the same proportion by using the temperature, the exhaust flow and the NOx concentration, if the efficiency is normal, increasing the urea injection amount, and monitoring the conversion efficiency under the injection amount until normal injection is recovered.
4. A diesel fuel quality-based urea injection control method as claimed in claim 3, characterized in that said SCR efficiency is an average conversion efficiency of the SCR over a period of time calculated from the NOx concentrations upstream and downstream.
5. A diesel fuel quality-based urea injection control method as claimed in claim 4, characterized in that if the calculated SCR efficiency is lower than the normal SCR efficiency, the urea injection is gradually reduced until the injection is stopped, indicating that the fuel quality at that time causes the SCR to deteriorate.
6. A diesel fuel quality-based urea injection control method as claimed in claim 5, characterized in that the fuel quality is monitored by a fuel quality sensor provided in the fuel tank.
7. The method for controlling urea injection based on diesel fuel quality as claimed in claim 6, wherein the urea injection system control unit feeds back 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 a meter.
8. The method of claim 6, wherein the upstream and downstream NOx concentrations are concentrations at an inlet end and an outlet end of the SCR catalyst, respectively.
CN202211126976.4A 2022-09-16 2022-09-16 Urea injection control method based on diesel quality Active CN115306518B (en)

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

Applications Claiming Priority (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

Publications (2)

Publication Number Publication Date
CN115306518A true CN115306518A (en) 2022-11-08
CN115306518B CN115306518B (en) 2024-05-24

Family

ID=83866685

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211126976.4A Active CN115306518B (en) 2022-09-16 2022-09-16 Urea injection control method based on diesel quality

Country Status (1)

Country Link
CN (1) CN115306518B (en)

Citations (5)

* Cited by examiner, † Cited by third party
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
CN115306518B (en) 2024-05-24

Similar Documents

Publication Publication Date Title
US7861518B2 (en) System and method for NOx reduction optimization
CN106837497B (en) Diesel engine catalytic reduction urea injection control method based on real-time ammonia storage amount management
US6427439B1 (en) Method and system for NOx reduction
US7610750B2 (en) Method and apparatus for monitoring a urea injection system in an exhaust aftertreatment system
US8726641B2 (en) Method for controlling injection of diesel exhaust fluid into an exhaust pipe of an internal combustion engine
US8826644B2 (en) Engine and exhaust aftertreatment control
CN106948912B (en) Diesel engine post-treatment exhaust heat management method and device
US7685810B2 (en) Engine control apparatus and engine operating method
EP2375023B1 (en) Method of controlling urea dosing in an exhaust system of a vehicle
US7992377B2 (en) Diesel exhaust control during limp-home mode
CN102465744B (en) System and method for controlling nitrogen oxide sensor
US10100695B2 (en) Exhaust fluid dosing control system and method
CN102635429B (en) Device and method for carrying out closed-loop control on discharge of internal combustion engine by using hydrogen and oxygen
US20080141659A1 (en) Emissions conformance for an exhaust after-treatment system having a dosing agent supply
CN210033581U (en) Engine tail gas aftertreatment control system
CN112963228B (en) Ammonia leakage control method, device and equipment
CN115306518B (en) Urea injection control method based on diesel quality
CN110905637A (en) Real-time detection reminding method for working efficiency of SCR system catalyst
CN114233504B (en) NO (NO) x Emission control method and device
CN211950638U (en) Selective non-catalytic reduction device with 40% methylamine water solution as reducing agent
CN114165315A (en) Reducing agent evaporation mixing system of SCR (selective catalytic reduction) system of marine diesel engine and supply method
CN115126579B (en) Urea injection quantity control method and vehicle
CN114370317B (en) Control method of urea pump, urea pump and engine
CN114856778A (en) Method, controller and system for judging ammonia leakage in vehicle running process
CN115045742B (en) Fault detection method and device of SCR (selective catalytic reduction) system and diesel automobile

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
TA01 Transfer of patent application right

Effective date of registration: 20240418

Address after: 4th Floor, Building 5, No. 168, Lane 6495, Tingwei Road, Jinshan District, Shanghai, June 2015 (Jinggong Economic Community)

Applicant after: Shanghai Hexia Jundao Intelligent Technology Co.,Ltd.

Country or region after: China

Address before: 1155, ChenWang Road, Taihu street, Changxing County, Huzhou City, Zhejiang Province

Applicant before: Zhejiang Hexia Technology Co.,Ltd.

Country or region before: China

TA01 Transfer of patent application right
GR01 Patent grant