CN106762058A - A kind of method and system for correcting urea injecting quantity - Google Patents
A kind of method and system for correcting urea injecting quantity Download PDFInfo
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- CN106762058A CN106762058A CN201611219570.5A CN201611219570A CN106762058A CN 106762058 A CN106762058 A CN 106762058A CN 201611219570 A CN201611219570 A CN 201611219570A CN 106762058 A CN106762058 A CN 106762058A
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- Prior art keywords
- urea
- amendment
- injecting quantity
- map
- nozzle
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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
- 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
- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust 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
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0412—Methods of control or diagnosing using pre-calibrated maps, tables or charts
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1621—Catalyst conversion efficiency
-
- 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
Abstract
The present invention relates to a kind of method for correcting urea injecting quantity, comprise the following steps：The amendment MAP of cumulative operation time of the urea injecting quantity on urea nozzle is obtained by demarcating；According to engine speed, circulating fuel injection quantity, delivery temperature, extraction flow and real-time NOXTarget urea injecting quantity under mass flow calculation real-time working condition；Cumulative operation time and the target urea injecting quantity being calculated for actually used urea nozzle determine the corresponding MAP points of the real-time working condition in the amendment MAP, so as to obtain correction factor of the urea nozzle under the real-time working condition, thus the target urea injecting quantity being calculated is modified.In addition, the present invention also proposes a kind of system for realizing the above method, including amendment MAP memory modules, computing module and correcting module.
Description
Technical field
The present invention relates to the post-processing technology field of engine fuel injection, in particular it relates to correct urea injecting quantity
Method and system.
Background technology
The urea injecting quantity of prior art is rotating speed, circulating fuel injection quantity, the delivery temperature according to current real-time working condition
With extraction flow data, based on oxynitrides (NOX) transformation efficiency and temperature adjustmemt calculate.The urea injecting quantity
The abrasion condition after nozzle long-time use is not accounted for.However, nozzle is after using abrasion, actual urea injecting quantity is than calculating
Emitted dose it is on the high side, can so have an impact discharge and increase urea crystals risk.
In addition to normal wear, after long-time use, system accuracy can also decline, and emitted dose may deviate standard
Value.After system long-time use, if do not demarcated to emitted dose, it is also possible to make actual ejection amount and calculate emitted dose
Deviation.
Urea nozzle can cause emitted dose bigger than normal because of cumulative operation time, but the system logic of prior art does not consider
This influence factor.Therefore, when actually used, system can be bigger than normal because adding up actual urea injecting quantity after running a period of time.
Thus the problems such as may result in NH_3 leakage.
After system accumulative operation a period of time, be likely to result in the decline of system accuracy so that actual urea injecting quantity with
Calculate emitted dose gap bigger than normal.
The content of the invention
The present invention can not under the accumulative use times of difference, different emitted doses for the accuracy of spray of urea nozzle
Same problem, by obtaining the amendment MAP of different accumulative use times, different emitted doses, so that under the real-time working condition of system
Target urea injecting quantity be modified.
The purpose of the present invention is achieved through the following technical solutions.
The present invention relates to a kind of method for correcting urea injecting quantity, it is characterised in that comprise the following steps：
- by the amendment MAP of demarcation acquisition cumulative operation time of the urea injecting quantity on urea nozzle；
- according to engine speed, circulating fuel injection quantity, delivery temperature, extraction flow and real-time NOXMass flow calculation reality
When operating mode under target urea injecting quantity；
- the cumulative operation time for being directed to actually used urea nozzle and the target urea injecting quantity being calculated are described
The corresponding MAP points of the real-time working condition are determined in amendment MAP, so as to obtain amendment system of the urea nozzle under the real-time working condition
Number, is thus modified to the target urea injecting quantity being calculated.
It is of the invention preferred embodiment in, it is described that by demarcating, to obtain urea injecting quantity tired on urea nozzle
The step of counting the amendment MAP of working time includes following sub-step：
S1- sets Calibrating experimental bench；
S2- tests injection of the nozzle of different cumulative operation times in different emitted doses on the Calibrating experimental bench
Precision；
S3- is right under different emitted doses according to the urea nozzle that the accuracy of spray obtains different cumulative operation times
The correction factor of each MAP point answered.
It is of the invention it is a kind of preferred embodiment in, it is described by demarcate obtain urea injecting quantity on urea spray
In the step of amendment MAP of the cumulative operation time of mouth, the urea with urea nozzle cumulative operation time as abscissa, to set
Emitted dose is demarcated for ordinate to emitted dose amendment MAP.
Advantageously, in the amendment that cumulative operation time of the urea injecting quantity on urea nozzle is obtained by demarcating
In the step of MAP, with the action frequency of the magnetic valve that controls urea nozzle to spray as abscissa, with the urea injecting quantity that sets as
Ordinate is demarcated to emitted dose amendment MAP.
In addition, the present invention also proposes a kind of system for correcting urea injecting quantity, the system is included with lower module：
- amendment MAP memory modules, amendment MAP memory modules are stored with the amendment of urea nozzle cumulative operation time
MAP；
- computing module, the computing module is according to engine speed, circulating fuel injection quantity, delivery temperature, extraction flow and reality
When NOXTarget urea injecting quantity under mass flow calculation real-time working condition；
- correcting module, the correcting module is based on the amendment of the nozzle cumulative operation time stored in amendment MAP memory modules
MAP is modified to the target urea injecting quantity being calculated by the computing module.
The advantage of the invention is that：
The amendment MAP of cumulative operation time of the urea injecting quantity on urea nozzle is obtained by demarcating and according to the amendment
MAP is modified to the target urea injecting quantity being calculated, and can accurately compensate for because of emitted dose caused by nozzle wear
Increase problem, realizes that urea calculates emitted dose and actual ejection amount is more nearly, so as to avoid the injection caused by nozzle wear
Measure the risk of the waste and system urea crystals caused by economically bigger than normal.The catalytic action of system is more reasonable, perfect；And
And can enable a system to, in the case where accumulated running time, mileage are more long, correct deviation, make actual ejection amount more smart
Really, rationally.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 shows the system logic schematic diagram of the calculating urea injecting quantity of prior art；
Fig. 2 shows the system logic schematic diagram of amendment urea injecting quantity of the invention.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in accompanying drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.Conversely, there is provided these implementation methods are able to be best understood from the disclosure, and can be by this public affairs
The scope opened it is complete convey to those skilled in the art.
According to the embodiment of the present invention, a kind of method for correcting urea injecting quantity is proposed, the method is comprised the following steps：
1. the amendment MAP of cumulative operation time of the urea injecting quantity on urea nozzle is obtained by demarcating.Specifically, should
Step can be implemented by following sub-step：
S1- sets Calibrating experimental bench, such as threst stand or offline stand；
S2- tests injection of the nozzle of different cumulative operation times in different emitted doses on the Calibrating experimental bench
Precision；
S3- is right under different emitted doses according to the urea nozzle that the accuracy of spray obtains different cumulative operation times
The correction factor of each MAP point answered.
2. according to engine speed, circulating fuel injection quantity, delivery temperature, extraction flow and real-time NOXMass flow calculation
Target urea injecting quantity under real-time working condition.Specifically, NO is obtained by engine speed and circulating fuel injection quantityXMain conversion effect
Rate, and obtain NO with reference to delivery temperature and extraction flowXTargeted transformation efficiency, it is preferable that for the delivery temperature for measuring
It is modified by temperature adjustmemt MAP with extraction flow, and the result of the amendment is bound to NOXMain transformation efficiency so as to
To NOXTargeted transformation efficiency, by the NOXTargeted transformation efficiency and real-time NOXMass flow is combined and is calculated real-time working condition
Under target urea injecting quantity.
3. for actually used urea nozzle cumulative operation time and the target urea injecting quantity that is calculated in institute
State amendment MAP in determine the corresponding MAP points of the real-time working condition, so as to obtain amendment system of the urea nozzle under the real-time working condition
Number, is thus modified to the target urea injecting quantity being calculated.
It is of the invention preferred embodiment in, it is described by demarcate obtain urea injecting quantity on urea nozzle
In the step of amendment MAP of cumulative operation time, sprayed with urea nozzle cumulative operation time as abscissa, with the urea for setting
Measure as ordinate is demarcated to emitted dose amendment MAP.
Preferably, the cumulative operation time is determined according to the action frequency of magnetic valve.
In addition, the invention further relates to a kind of system for correcting urea injecting quantity, the system is included with lower module：Amendment MAP
Memory module, computing module and correcting module.Wherein, amendment MAP memory modules are stored with urea nozzle cumulative operation time
Amendment MAP；Computing module is according to engine speed, circulating fuel injection quantity, delivery temperature, extraction flow and real-time NOXQuality stream
Amount calculates the target urea injecting quantity under real-time working condition；The nozzle that correcting module is based on being stored in amendment MAP memory modules adds up
The amendment MAP of working time is modified to the target urea injecting quantity being calculated by the computing module.
It is of the invention it is a kind of preferred embodiment in, the amendment MAP memory modules also include temperature adjustmemt MAP,
It is modified for the delivery temperature and extraction flow for measuring so that can be bound to for the result of the amendment by the computing module
NO is obtained by engine speed and circulating fuel injection quantityXTo main transformation efficiency so as to obtain the NO under real-time working conditionXTarget turn
Change efficiency, and by the NOXTargeted transformation efficiency and real-time NOXMass flow combines the target urine being calculated under real-time working condition
Plain emitted dose.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Enclose and be defined.
Claims (5)
1. it is a kind of correct urea injecting quantity method, it is characterised in that comprise the following steps：
- by the amendment MAP of demarcation acquisition cumulative operation time of the urea injecting quantity on urea nozzle；
- according to engine speed, circulating fuel injection quantity, delivery temperature, extraction flow and real-time NOXThe real-time work of mass flow calculation
Target urea injecting quantity under condition；
- the cumulative operation time for being directed to actually used urea nozzle and the target urea injecting quantity being calculated are in the amendment
The corresponding MAP points of the real-time working condition are determined in MAP, so that correction factor of the urea nozzle under the real-time working condition is obtained, by
This is modified to the target urea injecting quantity being calculated.
2. it is according to claim 1 amendment urea injecting quantity method, it is characterised in that it is described by demarcate obtain urea
The step of amendment MAP of cumulative operation time of the emitted dose on urea nozzle, includes following sub-step：
S1- sets Calibrating experimental bench；
S2- tests injection essence of the nozzle of different cumulative operation times in different emitted doses on the Calibrating experimental bench
Degree；
S3- is corresponding under different emitted doses according to the urea nozzle that the accuracy of spray obtains different cumulative operation times
The correction factor of each MAP point.
3. it is according to claim 2 amendment urea injecting quantity method, it is characterised in that it is described by demarcate urinated
In the step of amendment MAP of cumulative operation time of the plain emitted dose on urea nozzle, it is with urea nozzle cumulative operation time
Abscissa, emitted dose amendment MAP is demarcated as ordinate with the urea injecting quantity for setting.
4. it is according to claim 1 amendment urea injecting quantity method, it is characterised in that it is described by demarcate urinated
In the step of amendment MAP of cumulative operation time of the plain emitted dose on urea nozzle, with the electromagnetism for controlling urea nozzle to spray
The action frequency of valve is abscissa, emitted dose amendment MAP is demarcated as ordinate with the urea injecting quantity for setting.
5. it is a kind of correct urea injecting quantity system, it is characterised in that including with lower module：
- amendment MAP memory modules, amendment MAP memory modules are stored with the amendment MAP of urea nozzle cumulative operation time；
- computing module, the computing module is according to engine speed, circulating fuel injection quantity, delivery temperature, extraction flow and real-time NOX
Target urea injecting quantity under mass flow calculation real-time working condition；
- correcting module, the correcting module is based on the amendment MAP of the nozzle cumulative operation time stored in amendment MAP memory modules
Target urea injecting quantity to being calculated by the computing module is modified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611219570.5A CN106762058A (en) | 2016-12-26 | 2016-12-26 | A kind of method and system for correcting urea injecting quantity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611219570.5A CN106762058A (en) | 2016-12-26 | 2016-12-26 | A kind of method and system for correcting urea injecting quantity |
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| CN106762058A true CN106762058A (en) | 2017-05-31 |
Family
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| CN201611219570.5A Pending CN106762058A (en) | 2016-12-26 | 2016-12-26 | A kind of method and system for correcting urea injecting quantity |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023359A (en) * | 2017-06-07 | 2017-08-08 | 北京工业大学 | A kind of NOx after-treatment systems of non-electric controlling diesel engine |
| CN109681297A (en) * | 2018-11-22 | 2019-04-26 | 江苏大学 | A kind of motor exhaust urea injection apparatus and its control method |
| CN112302771A (en) * | 2020-11-06 | 2021-02-02 | 潍柴动力股份有限公司 | Method, device and equipment for detecting urea consumption abnormity and storage medium |
| CN112943420A (en) * | 2021-03-09 | 2021-06-11 | 广西玉柴机器股份有限公司 | Strategy for correcting urea injection amount to prevent urea from crystallizing |
| CN113358363A (en) * | 2021-07-06 | 2021-09-07 | 南昌碳印环保科技有限公司 | Method for identifying Urea crystallization critical state of Urea-SCR system |
| CN114151180A (en) * | 2021-12-10 | 2022-03-08 | 潍柴动力股份有限公司 | Method and device for acquiring NOx emission of diesel engine, automobile and storage medium |
| CN114233445A (en) * | 2021-12-13 | 2022-03-25 | 潍柴动力股份有限公司 | Method and device for detecting urea crystals of SCR system |
| CN114645755A (en) * | 2021-05-21 | 2022-06-21 | 长城汽车股份有限公司 | Urea injection control method, urea injection control device, storage medium, electronic device, and vehicle |
| CN114837780A (en) * | 2022-05-25 | 2022-08-02 | 潍柴动力股份有限公司 | Method for correcting urea injection quantity |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023359A (en) * | 2017-06-07 | 2017-08-08 | 北京工业大学 | A kind of NOx after-treatment systems of non-electric controlling diesel engine |
| CN109681297A (en) * | 2018-11-22 | 2019-04-26 | 江苏大学 | A kind of motor exhaust urea injection apparatus and its control method |
| CN112302771A (en) * | 2020-11-06 | 2021-02-02 | 潍柴动力股份有限公司 | Method, device and equipment for detecting urea consumption abnormity and storage medium |
| CN112943420A (en) * | 2021-03-09 | 2021-06-11 | 广西玉柴机器股份有限公司 | Strategy for correcting urea injection amount to prevent urea from crystallizing |
| CN114645755A (en) * | 2021-05-21 | 2022-06-21 | 长城汽车股份有限公司 | Urea injection control method, urea injection control device, storage medium, electronic device, and vehicle |
| CN113358363A (en) * | 2021-07-06 | 2021-09-07 | 南昌碳印环保科技有限公司 | Method for identifying Urea crystallization critical state of Urea-SCR system |
| CN113358363B (en) * | 2021-07-06 | 2022-09-02 | 南昌碳印环保科技有限公司 | Method for identifying Urea crystallization critical state of Urea-SCR system |
| CN114151180A (en) * | 2021-12-10 | 2022-03-08 | 潍柴动力股份有限公司 | Method and device for acquiring NOx emission of diesel engine, automobile and storage medium |
| CN114233445A (en) * | 2021-12-13 | 2022-03-25 | 潍柴动力股份有限公司 | Method and device for detecting urea crystals of SCR system |
| CN114837780A (en) * | 2022-05-25 | 2022-08-02 | 潍柴动力股份有限公司 | Method for correcting urea injection quantity |
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