CN110284948B - Control method of SCR system - Google Patents
Control method of SCR system Download PDFInfo
- Publication number
- CN110284948B CN110284948B CN201910581113.8A CN201910581113A CN110284948B CN 110284948 B CN110284948 B CN 110284948B CN 201910581113 A CN201910581113 A CN 201910581113A CN 110284948 B CN110284948 B CN 110284948B
- Authority
- CN
- China
- Prior art keywords
- urea pump
- timing
- scr system
- temperature
- urea
- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- 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
- F01N2610/1433—Pumps
- F01N2610/144—Control thereof
-
- 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)
- Control Of Positive-Displacement Pumps (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application discloses a control method of an SCR system, which comprises the following steps: 11) judging whether a urea pump of the SCR system needs to be unfrozen, if so, heating the urea pump until the urea pump is unfrozen; 12) starting timing when the urea pump completes thawing; 13) and stopping timing after the urea pump receives the starting signal, judging whether the timing time is equal to or greater than the preset time, and if so, forbidding the urea pump to start. According to the control method of the SCR system, after the urea pump is unfrozen and before the urea pump is started, whether the urea pump is secondarily frozen can be obtained by judging the time interval, if the urea pump is not secondarily frozen, the urea pump can be directly started when a starting signal is received, and if the secondary freezing occurs, the urea pump is forbidden to be started so as to protect the urea pump, the frozen urea pump is prevented from being directly started and damaged, the normal work of the urea pump is better guaranteed, and the working performance of the SCR system is improved.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a control method of an SCR system.
Background
When the ambient temperature is relatively low, the urea solution in the SCR system freezes, so components such as a urea pump, a urea tank, a urea pipe, a urea nozzle and the like need to be heated to thaw the urea solution inside the components, and when the temperatures of the components rise to a predetermined temperature, that is, after the urea solution in each component is thawed, the SCR system can enter a normal operating state.
When the urea pump is unfrozen, the time for unfreezing the urea pump is short, the unfreezing of other parts is generally completed before the unfreezing of the other parts is completed, the temperature of the urea pump cannot be detected in the waiting process, after all the parts are unfrozen, the ECU sends out a starting signal, and the parts start to cooperate to realize the injection of the urea solution. However, in an actual defrosting process, the urea pump may freeze again after defrosting is completed and when waiting for other components to be defrosted, and if the urea pump is directly driven at this time, the urea pump may be damaged.
Disclosure of Invention
In view of this, the invention provides a control method of an SCR system, which can prevent a urea pump after thawing from being damaged when the urea pump is started due to refreezing, and better ensure normal operation of the urea pump.
In order to achieve the purpose, the invention provides the following technical scheme:
a control method of an SCR system, comprising the steps of:
11) judging whether a urea pump of the SCR system needs to be unfrozen, if so, heating the urea pump until the urea pump is unfrozen;
12) starting timing while the urea pump is defrosted;
13) and stopping timing after the urea pump receives the starting signal, judging whether the timing time is equal to or greater than the preset time, and if so, forbidding the urea pump to start.
Preferably, the method for controlling the SCR system further includes:
14) repeating step 11) and step 12);
15) and stopping timing after the urea pump receives the starting signal again, judging whether the timing time is shorter than the preset time, and starting the urea pump if the timing time is shorter than the preset time.
Preferably, in the method for controlling the SCR system, step 11) includes:
111) measuring the temperature of the urea pump, judging whether the measured temperature is lower than a thawing temperature, and if so, heating the urea pump;
112) and continuously measuring the temperature of the heated urea pump, judging whether the measured temperature is equal to or higher than the unfreezing temperature in real time, if so, stopping heating, and unfreezing the urea pump.
Preferably, in the control method of the SCR system, step 12) is specifically:
and detecting whether the urea pump stops heating or not in real time, and if so, starting timing.
Preferably, in the method for controlling the SCR system, step 13) includes:
131) judging whether the urea pump receives the starting signal or not, if so, stopping timing and judging the timing duration;
132) and when the timing duration is equal to or greater than the preset duration, detecting the temperature of the urea pump again, judging whether the measured temperature is lower than the unfreezing temperature again, and if so, forbidding the urea pump to start.
According to the control method of the SCR system, after the urea pump is unfrozen and before the urea pump is started, whether the urea pump is secondarily frozen can be obtained through the mode of judging the interval duration, if the urea pump is not secondarily frozen, the urea pump can be directly started when a starting signal is received, if the secondary freezing occurs, the urea pump is forbidden to be started, so that the urea pump is protected, the frozen urea pump is prevented from being directly started and damaged, the normal work of the urea pump is better guaranteed, and the working performance of the SCR system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a control method of an SCR system according to an embodiment of the present invention.
Detailed Description
The invention provides a control method of an SCR system, which can avoid the damage of a urea pump after unfreezing when the urea pump is started due to refreezing and better ensure the normal work of the urea pump.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a control method for an SCR system, which mainly relates to how a urea pump should be started after being frozen, and mainly includes the following steps:
11) in a low-temperature environment, after T15 is powered on, an ECU of the engine judges whether a urea pump of the SCR system needs to be unfrozen under the cooperation of a sensor, if so, the urea pump is heated so as to enable the urea pump to enter a heating and unfreezing state until the urea pump is unfrozen; if not, the subsequent operation can be directly carried out, such as starting a urea pump;
12) when the urea pump is detected to be defrosted, the ECU is started to time;
13) after the engine is started, a starting signal is sent to the SCR system, timing is stopped when the urea pump receives the starting signal, the ECU judges whether the timing duration is equal to or greater than a preset duration (the preset duration is the shortest duration required by the urea pump to be frozen) preset in the ECU, if yes, the urea pump is prohibited from being started, namely, the interval duration from the time when the urea pump is thawed to the time when the urea pump is started is enough to enable the urea pump to be frozen for the second time, if the urea pump which is frozen again is started according to the starting signal, the damage of the urea pump is likely to be caused, and therefore, in order to protect the urea pump, the ECU prohibits the urea pump from being started under the condition.
Further, in order to realize the normal operation of the SCR system, the control method further includes the following steps:
14) repeating the step 11) and the step 12), namely confirming whether the urea pump needs to be unfrozen again after the urea pump is prohibited to be started, heating the urea pump again if the urea pump needs to be unfrozen, and starting timing again after the unfreezing is finished;
15) and starting the urea pump again, namely stopping timing after the urea pump receives the starting signal again, judging whether the duration of the timing is less than the preset duration or not, and if so, starting the urea pump, namely, the duration of the interval cannot freeze the urea pump for the third time, so that the starting requirement of the urea pump is met, and the ECU allows the urea pump to be started.
In the control method of the SCR system, the specific operation process of step 11) is:
111) the temperature sensor measures the temperature of the urea pump, judges whether the measured temperature is lower than a unfreezing temperature (the temperature is lower than the unfreezing temperature, the urea pump is considered to be frozen) or not, and heats the urea pump if the temperature is lower than the unfreezing temperature, and the heating process can be realized through the work of the electric heater;
112) and continuously measuring the temperature of the heated urea pump, namely always measuring the temperature of the urea pump in the process of heating the urea pump, judging whether the temperature of the urea pump is equal to or higher than the unfreezing temperature in real time according to the measured temperature value, if so, stopping heating, and unfreezing the urea pump.
In the foregoing control method of the SCR system, the specific operation process of step 12) is:
whether the urea pump stops heating or not is detected in real time through a sensor, namely whether an electric heater stops working or the real-time temperature of the urea pump is detected (when the temperature of the urea pump reaches the unfreezing temperature, heating is stopped), and if yes, the time length of the urea pump after unfreezing is finished is measured.
In the foregoing control method of the SCR system, the specific operation process of step 13) is:
131) the ECU judges whether the urea pump receives a starting signal in real time, if so, the timing is stopped and the timing duration is judged, and the interval duration from the completion of thawing to the reception of the starting signal is compared with the duration preset in the ECU;
132) when the timing duration is equal to or greater than the preset duration, namely the urea pump is likely to freeze again theoretically, in order to obtain an accurate result, the temperature of the urea pump is measured for the second time, whether the measured temperature is lower than the unfreezing temperature is judged again, if yes, the urea pump is judged to be frozen for the second time, and therefore the urea pump needs to be prohibited from being started; if the temperature of the urea pump is detected to be higher than the unfreezing temperature again, the urea pump is not prohibited from being started, the urea pump can be started according to a starting signal, or the urea pump can be directly started when the timing duration is less than the preset duration.
In the present specification, the structure of each part is described in a progressive manner, the operation of each part is mainly described as different from the existing operation, and the whole and partial flow of the control method of the SCR system can be obtained by combining the operations of the parts.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A control method of an SCR system, characterized by comprising the steps of:
11) judging whether a urea pump of the SCR system needs to be unfrozen, if so, heating the urea pump until the urea pump is unfrozen;
12) starting timing while the urea pump is defrosted;
13) the urea pump stops timing after receiving a starting signal, whether the timing time is equal to or greater than a preset time is judged, and if yes, the urea pump is forbidden to start;
14) repeating the step 11) and the step 12) to heat the urea pump subjected to the secondary freezing and start timing again after the thawing is completed;
15) and stopping timing after the urea pump receives the starting signal again, judging whether the timing time is shorter than the preset time, and starting the urea pump if the timing time is shorter than the preset time.
2. The control method of the SCR system according to claim 1, wherein step 11) comprises:
111) measuring the temperature of the urea pump, judging whether the measured temperature is lower than a thawing temperature, and if so, heating the urea pump;
112) and continuously measuring the temperature of the heated urea pump, judging whether the measured temperature is equal to or higher than the unfreezing temperature in real time, if so, stopping heating, and unfreezing the urea pump.
3. The method of controlling an SCR system according to claim 2, wherein step 12) is specifically:
and detecting whether the urea pump stops heating or not in real time, and if so, starting timing.
4. The control method of the SCR system according to claim 3, wherein step 13) comprises:
131) judging whether the urea pump receives the starting signal or not, if so, stopping timing and judging the timing duration;
132) and when the timing duration is equal to or greater than the preset duration, detecting the temperature of the urea pump again, judging whether the measured temperature is lower than the unfreezing temperature again, and if so, forbidding the urea pump to start.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910581113.8A CN110284948B (en) | 2019-06-29 | 2019-06-29 | Control method of SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910581113.8A CN110284948B (en) | 2019-06-29 | 2019-06-29 | Control method of SCR system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110284948A CN110284948A (en) | 2019-09-27 |
| CN110284948B true CN110284948B (en) | 2020-11-20 |
Family
ID=68020157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910581113.8A Active CN110284948B (en) | 2019-06-29 | 2019-06-29 | Control method of SCR system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110284948B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111102048A (en) * | 2019-12-17 | 2020-05-05 | 凯龙高科技股份有限公司 | Heating and unfreezing control system and method for urea pump of SCR system |
| CN111140318B (en) * | 2019-12-30 | 2021-06-22 | 潍柴动力股份有限公司 | Method, device and equipment for diagnosing urea thawing capacity and storage medium |
| CN111485979B (en) * | 2020-04-13 | 2022-05-27 | 凯龙高科技股份有限公司 | Heating control method of liquid supply pump |
| CN113202606B (en) * | 2021-05-08 | 2022-11-29 | 潍柴动力股份有限公司 | Control method and control system for unfreezing urea pump |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688457A (en) * | 2007-06-20 | 2010-03-31 | 因勒纪汽车系统研究公司 | Be used to start the method for a pump |
| CN101918687A (en) * | 2008-02-15 | 2010-12-15 | 博世株式会社 | Fault diagnosis apparatus for oxidation catalyst, method of fault diagnosis for oxidation catalyst, and exhaust purification apparatus of internal combustion engine |
| CN102066761A (en) * | 2008-06-03 | 2011-05-18 | 因勒纪汽车系统研究公司 | Process for starting an SCR system |
| CN102808680A (en) * | 2012-07-27 | 2012-12-05 | 潍柴动力股份有限公司 | Control method for SCR system low-temperature thawing |
| CN102947562A (en) * | 2010-05-17 | 2013-02-27 | 五十铃自动车株式会社 | Scr thawing control system |
| CN105298603A (en) * | 2015-12-10 | 2016-02-03 | 潍柴动力股份有限公司 | SCR aftertreatment heating system and control method thereof |
| CN109611182A (en) * | 2019-02-22 | 2019-04-12 | 奇瑞汽车股份有限公司 | A kind of control method of engine electro-heated catalyst |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8234854B2 (en) * | 2008-10-22 | 2012-08-07 | Caterpillar Inc. | System and method for heating a reducing agent associated with a reducing agent distribution system |
| CN201546791U (en) * | 2009-11-19 | 2010-08-11 | 北汽福田汽车股份有限公司 | Urea heating device |
| DE102013101573A1 (en) * | 2013-02-18 | 2014-08-21 | Emitec France S.A.S | Method for heating a conveyor |
| FR3050489B1 (en) * | 2016-04-25 | 2018-04-06 | Akwel | METHOD FOR HEATING A FLUID CIRCUIT BY ALTERNATING CURRENT POWER SUPPLY OF A CONTINUOUS CURRENT PUMP MOTOR |
| CN106640290A (en) * | 2016-11-07 | 2017-05-10 | 山东大学 | Urea box heating water valve control method and system |
| CN108425723A (en) * | 2018-03-21 | 2018-08-21 | 南京依柯卡特排放技术股份有限公司 | In-use automotive tail gas clean-up DePM ＆ NOx systems and control method |
| CN108425726B (en) * | 2018-03-28 | 2024-01-26 | 吉林大学 | SCR system heating device and control method thereof |
-
2019
- 2019-06-29 CN CN201910581113.8A patent/CN110284948B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688457A (en) * | 2007-06-20 | 2010-03-31 | 因勒纪汽车系统研究公司 | Be used to start the method for a pump |
| CN101918687A (en) * | 2008-02-15 | 2010-12-15 | 博世株式会社 | Fault diagnosis apparatus for oxidation catalyst, method of fault diagnosis for oxidation catalyst, and exhaust purification apparatus of internal combustion engine |
| CN102066761A (en) * | 2008-06-03 | 2011-05-18 | 因勒纪汽车系统研究公司 | Process for starting an SCR system |
| CN102947562A (en) * | 2010-05-17 | 2013-02-27 | 五十铃自动车株式会社 | Scr thawing control system |
| CN102808680A (en) * | 2012-07-27 | 2012-12-05 | 潍柴动力股份有限公司 | Control method for SCR system low-temperature thawing |
| CN105298603A (en) * | 2015-12-10 | 2016-02-03 | 潍柴动力股份有限公司 | SCR aftertreatment heating system and control method thereof |
| CN109611182A (en) * | 2019-02-22 | 2019-04-12 | 奇瑞汽车股份有限公司 | A kind of control method of engine electro-heated catalyst |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110284948A (en) | 2019-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110284948B (en) | Control method of SCR system | |
| US8479497B2 (en) | Method for operating an SCR-catalytic converter | |
| US9255511B2 (en) | Exhaust purification system and method for controlling exhaust purification system | |
| JP4706627B2 (en) | Engine exhaust purification system | |
| WO2011145573A1 (en) | Scr system | |
| EP3533978B1 (en) | Urea water supply system and control method therefor | |
| WO2005106220A1 (en) | Liquid feed device for exhaust gas aftertreatment device | |
| JP4978635B2 (en) | Control device for exhaust purification system | |
| US20170314440A1 (en) | Urea water injection system and method for preventing crystallization in urea water injection device | |
| CN104421030A (en) | Intelligent method for controlling warming-up of engine | |
| CN111295501B (en) | Method for preventing the risk of freezing in a reducing agent supply device of a selective catalytic reduction system | |
| CN107091136B (en) | The emission-control equipment of internal combustion engine | |
| US10718244B2 (en) | Method for operating a device for providing a liquid additive | |
| JP5533363B2 (en) | SCR system | |
| KR20180021653A (en) | Method and device for sequential control of an exhaust gas control system | |
| JP6753949B2 (en) | Heater control device and heater control method | |
| JP2019143611A (en) | Addition control device | |
| FR2970505A1 (en) | A METHOD FOR CONTROLLING AN EXHAUST LINE AND A VEHICLE ADAPTED FOR IMPLEMENTING SAID METHOD | |
| WO2013079838A1 (en) | Method for optimizing the heating time of an ammonia source for reducing nitrogen oxides | |
| CN113227548B (en) | Method of operating a urea dosing system in an engine system and engine system comprising a urea dosing system | |
| JP5987697B2 (en) | Urea water addition device controller | |
| CN117988949A (en) | Method and device for operating a reducing agent injection system for an exhaust gas aftertreatment device of an internal combustion engine | |
| CN110821611B (en) | Method for operating a transport module of an SCR catalytic converter system | |
| JP2018071387A (en) | Defrosting controlling device | |
| CN115559805A (en) | Controlling NOx emissions control during vehicle launch |
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 |