CN106709255A - SCR catalyst aging computing method - Google Patents
SCR catalyst aging computing method Download PDFInfo
- Publication number
- CN106709255A CN106709255A CN201611248255.5A CN201611248255A CN106709255A CN 106709255 A CN106709255 A CN 106709255A CN 201611248255 A CN201611248255 A CN 201611248255A CN 106709255 A CN106709255 A CN 106709255A
- Authority
- CN
- China
- Prior art keywords
- aging
- scr
- temperature
- tscr
- coefficient
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
- G16C20/00—Chemoinformatics, i.e. ICT specially adapted for the handling of physicochemical or structural data of chemical particles, elements, compounds or mixtures
- G16C20/10—Analysis or design of chemical reactions, syntheses or processes
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Bioinformatics & Computational Biology (AREA)
- Computing Systems (AREA)
- Theoretical Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention relates to an aging computing method in particular to a SCR catalyst aging computing method, belonging to the technical field of diesel engine after treatment system. According to the technical scheme provided by the SCR catalyst aging computing method, the SCR catalyst aging computing method is capable of acquiring the SCR temperature value. The SCR average temperature Tscr and the duration of the SCR average temperature tscr are acquired according to the SCR temperature value. The aging reference time tc is acquired in accordance with the catalyst parameters, and then the stored effective temperature Tm is acquired. According to the effective temperature Tm, the SCR average temperature Tscr, the duration of the SCR average temperature tscr and the aging reference time tc, the current effective aging temperature Tn is definitely acquired. An aging coefficient is acquired according to the acquired current effective aging temperature Tn. The SCR catalyst aging computing method has the advantages of effectively determining the aging coefficient of the SCR catalyst and greatly reducing the identical workload about the process to determine the SCR catalyst aging coefficient.
Description
Technical field
The present invention relates to a kind of degradation calculation method, especially a kind of SCR catalyst degradation calculation method, belongs to diesel engine
The technical field of after-treatment system.
Background technology
At present, SCR post-processing technologies be state four, state five and in the Reduction for Diesel Engines low exhaust gas of state six NOx technical way.
With the operation of engine, SCR catalyst can be gradually aging, and then reduces the energy of NOX in SCR catalyst conversion diesel engine vent gas
Power, aging more serious, this influence is bigger.How accurately to judge the aging performance when SCR catalyst prior, determine
Can SCR aftertreatment system accurately control urea injecting quantity, prevent SCR conversion efficiency not enough or the excessive situation of NH_3 leakage.
When post processing control system is calculated, it is considered that SCR catalyst is aging two direct factors influences, and SCR is average
Temperature and ageing time at such a temperature.Currently, the conventional method for calculating SCR catalyst aging coefficient is, first by each
SCR mean temperatures provide the weight of each temperature to the aging influence degree of catalyst, when then the weighted value runs to engine
Between integrate, obtain an integrated value, the integrated value looks into corresponding aging coefficient map, that is, obtains the aging coefficient of SCR catalyst.
The numerical procedure main feature has：1), by different SCR mean temperatures, by the ratio of weight, it is changed into the general of normal temperature
Read, make it to time integral, ageing time of the SCR catalyst under the normal temperature is calculated, so as to obtain an aging system
Number；2), calculated by the way of map is inquired about in the common numerical procedure.
The major drawbacks of above-mentioned numerical procedure have：1), SCR catalyst ageing process is that SCR catalyst is flat in standard SCR
At equal temperature, the cumulative process of ageing time, namely SCR catalyst degree of aging, embodied by its ageing time, it is impossible to using old
Change coefficient and directly calculate aging coefficient with the relation formula of temperature；2) in the case of, cannot being calculated using formula, map is employed
The calculation of inquiry, its computational accuracy is relatively low, it is desirable to which high-precision control SCR urea injecting quantities, difficulty is larger.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, there is provided a kind of SCR catalyst degradation calculation method,
Its aging coefficient that can effectively determine SCR catalyst, is greatly decreased the demarcation work for reducing and determining SCR catalyst aging coefficient process
Measure.
According to the technical scheme that the present invention is provided, the SCR catalyst degradation calculation method obtains SCR temperature value, and root
SCR mean temperature Tscr and SCR mean temperature duration tscr is worth to according to SCR temperature；According to catalyst parameters, obtain
Aging reference time tc；
The effective temperature Tm of storage is read, and is continued according to effective temperature Tm, SCR mean temperature Tscr, SCR mean temperature
Time tscr and aging reference time tc, it is determined that obtaining the currently active aging temperature Tn；
According to the currently active aging temperature Tn for obtaining, aging coefficient δ is determined, wherein, aging coefficient δ is
Wherein, K1 is the first rate chemistry potential quality factor, and K2 is the second rate chemistry potential quality factor, E chemical reaction activation
Can, α chemical reaction activation energy modifying factors, TlimIt is the limit aging temperature of catalyst.
After aging coefficient δ is obtained, by the aging coefficient δ and aging coefficient minimum value and aging coefficient maximum ratio
Compared with, if aging coefficient δ be more than aging coefficient maximum, aging coefficient δ is taken into aging coefficient maximum；If aging coefficient δ
During less than aging coefficient minimum value, then aging coefficient δ is set to a ten thousandth of fresh state.
The SCR temperature value include SCR upstream temperatures value and SCR downstream temperature values, obtain SCR upstream temperatures value with
And after SCR downstream temperature values, and when temperature signal is effective, calculates and determine that SCR mean temperature Tscr and SCR mean temperatures are held
Continuous time tscr.
It is determined that during aging reference time tc, according to the chemical reaction activation energy and the chemical reaction of catalyst of catalyst
The speed potential quality factor is tabled look-up and obtains fiducial time initial value, and looking into fair curve according to chemical reaction activation energy modifying factor obtains the time
Correction factor, the time complexity curve coefficient is multiplied with fiducial time initial value, to obtain catalyst in the currently active ageing time Tn
Under aging reference time tc.
The effective temperature Tm is stored in eeprom memory, after the currently active aging temperature Tn is obtained, will
Effective temperature Tm in eeprom memory is replaced by the currently active aging temperature Tn；When receiving aging coefficient reset signal
When, then the effective temperature in eeprom memory is replaced by initial effective temperature Tnc.
During according to effective temperature Tm, SCR mean temperature Tscr, SCR mean temperature duration tscr and aging reference
Between tc, it is determined that the detailed process for obtaining the currently active aging temperature Tn is：
According to effective temperature Tm and aging reference time tc, determine that the corresponding fresh state catalyst of catalyst is flat in SCR
Ageing time t1 under equal temperature Tscr, specially：
T1=tce((Tm-Tscr)/β)
According to ageing time t1, SCR mean temperature duration tscr and aging reference time tc, obtain the currently active
Aging temperature Tn is
Tn=- β (lntc-ln (tscr+t1))+Tscr
Wherein, β is aging correction factor.
Advantages of the present invention：SCR mean temperature Tscr and SCR the mean temperature duration is obtained by SCR temperature
Tscr, according to catalyst parameters, obtains aging reference time tc, so as to obtain the currently active aging temperature Tn, so as to essence
Aging coefficient δ really is obtained, the factor shadow such as catalyst self character, aging temperature, ageing time, catalyst change has been considered
Sound is greatly decreased the staking-out work amount for determining SCR catalyst aging coefficient process.
Brief description of the drawings
Fig. 1 is logic chart of the invention.
Fig. 2 is present invention determine that the flow chart of the currently active aging temperature Tn.
Specific embodiment
With reference to specific drawings and Examples, the invention will be further described.
In order to be able to effectively determine the aging coefficient of SCR catalyst, reduction is greatly decreased and determines SCR catalyst aging coefficient mistake
The staking-out work amount of journey, the present invention obtains SCR temperature value, and is worth to SCR mean temperatures Tscr and SCR according to SCR temperature
Mean temperature duration tscr；According to catalyst parameters, aging reference time tc is obtained；
The effective temperature Tm of storage is read, and is continued according to effective temperature Tm, SCR mean temperature Tscr, SCR mean temperature
Time tscr and aging reference time tc, it is determined that obtaining the currently active aging temperature Tn；
According to the currently active aging temperature Tn for obtaining, aging coefficient δ is determined, wherein, aging coefficient δ is
Wherein, K1 is the first rate chemistry potential quality factor, and K2 is the second rate chemistry potential quality factor, E chemical reaction activation
Can, α chemical reaction activation energy modifying factors, TlimIt is the limit aging temperature of catalyst.
Specifically, obtain SCR temperature after, using SCR mean temperatures module determine obtain SCR mean temperatures Tscr and
SCR mean temperature duration tscr；Reference time module obtains aging reference time tc according to catalyst parameters；It is effectively warm
Degree computing module is according to and according to effective temperature Tm, SCR mean temperature Tscr, SCR mean temperature duration tscr and always
Change fiducial time tc, it is determined that obtaining the currently active aging temperature Tn；Aging coefficient computing module is the currently active old according to what is obtained
Change temperature Tn, determine aging coefficient δ, as shown in Figure 1.
During specific implementation, after aging coefficient δ is obtained, usage factor takes limit module and the value of aging coefficient δ is repaiied
Just, specifically, coefficient curve module compares the aging coefficient δ with aging coefficient minimum value and aging coefficient maximum,
If aging coefficient δ is more than aging coefficient maximum, aging coefficient δ is taken into aging coefficient maximum；If aging coefficient δ is less than
During aging coefficient minimum value, then aging coefficient δ is set to a ten thousandth of fresh state.Usually, aging coefficient maximum is 1,
Aging coefficient minimum value is 0, when aging coefficient δ is less than aging coefficient minimum value, aging coefficient δ typically is taken as into 0.0001,
The a ten thousandth of as fresh state, i.e. catalyst are in total failure mode.
Further, the SCR temperature value includes SCR upstream temperatures value and SCR downstream temperature values, on SCR is obtained
After trip temperature value and SCR downstream temperature values, and when temperature signal is effective, calculate and determine SCR mean temperatures Tscr and SCR
Mean temperature duration tscr.
In the embodiment of the present invention, temperature signal effectively, is specifically referred to according to SCR upstream temperatures value and SCR downstream temperatures
When value calculates SCR mean temperature Tscr, SCR upstream temperature sensors, the electric fault of SCR downstream temperature sensors or signal are closed
When rationality failure does not all exist, it is believed that the temperature signal is effective.When SCR mean temperature Tscr are calculated, SCR upstream temperatures value,
SCR downstream temperatures value has corresponding weighted value, and corresponding weighted value is multiplied with temperature value, obtains SCR mean temperatures Tscr.
When being 0.5 such as weighted value, then SCR mean temperatures Tscr is the one of SCR upstream temperatures value and SCR downstream temperature value sums
Half.
It is determined that during aging reference time tc, the chemistry of chemical reaction activation energy and catalyst according to catalyst is anti-
Answer the speed potential quality factor (K1, K2) to table look-up and obtain fiducial time initial value, it is bent to look into amendment according to chemical reaction activation energy modifying factor α
Line obtains time complexity curve coefficient, and the time complexity curve coefficient is multiplied with fiducial time initial value, to obtain catalyst the currently active
Aging reference time tc under ageing time Tn.During specific implementation, the detailed process for obtaining aging reference time tc is this technology
Known to the personnel of field, here is omitted.
Further, effective temperature Tm storage is in eeprom memory, when obtaining the currently active aging temperature Tn
Afterwards, the effective temperature Tm in eeprom memory is replaced by the currently active aging temperature Tn；Reset when aging coefficient is received
During signal, then the effective temperature Tm in eeprom memory is replaced by initial effective temperature Tnc.When receiving aging coefficient weight
During confidence, show to have changed SCR catalyst or reset manually by user, can ensure that SCR is catalyzed by initial effective temperature Tnc
The precision that agent aging coefficient is calculated.
As shown in Fig. 2 according to effective temperature Tm, SCR mean temperature Tscr, SCR mean temperature duration tscr and
Aging reference time tc, it is determined that the detailed process for obtaining the currently active aging temperature Tn is：
According to effective temperature Tm and aging reference time tc, determine that the corresponding fresh state catalyst of catalyst is flat in SCR
Ageing time t1 under equal temperature Tscr, specially：
T1=tce((Tm-Tscr)/β)
According to ageing time t1, SCR mean temperature duration tscr and aging reference time tc, obtain the currently active
Aging temperature Tn is
Tn=- β (lntc-ln (tscr+t1))+Tscr
Wherein, β is aging correction factor.
The present invention obtains SCR mean temperature Tscr and SCR mean temperature duration tscr by SCR temperature, according to
Catalyst parameters, obtain aging reference time tc, aging so as to be accurately obtained so as to obtain the currently active aging temperature Tn
Coefficient δ, has considered the influence of the factors such as catalyst self character, aging temperature, ageing time, catalyst change and has been greatly decreased
Determine the staking-out work amount of SCR catalyst aging coefficient process.
Claims (6)
1. a kind of SCR catalyst degradation calculation method, it is characterized in that：SCR temperature value is obtained, and SCR is worth to according to SCR temperature
Mean temperature Tscr and SCR mean temperature duration tscr；According to catalyst parameters, aging reference time tc is obtained；
The effective temperature Tm of storage is read, and according to effective temperature Tm, SCR mean temperature Tscr, the SCR mean temperature duration
Tscr and aging reference time tc, it is determined that obtaining the currently active aging temperature Tn；
According to the currently active aging temperature Tn for obtaining, aging coefficient δ is determined, wherein, aging coefficient δ is
Wherein, K1 is the first rate chemistry potential quality factor, and K2 is the second rate chemistry potential quality factor, E chemical reaction activation energy, α
Chemical reaction activation energy modifying factor, TlimIt is the limit aging temperature of catalyst.
2. SCR catalyst degradation calculation method according to claim 1, it is characterized in that：After aging coefficient δ is obtained, will
The aging coefficient δ compares with aging coefficient minimum value and aging coefficient maximum, if aging coefficient δ is more than aging coefficient most
During big value, then aging coefficient δ is taken into aging coefficient maximum；If aging coefficient δ is less than aging coefficient minimum value, will be aging
Coefficient δ is set to a ten thousandth of fresh state.
3. SCR catalyst degradation calculation method according to claim 1, it is characterized in that：The SCR temperature value includes SCR
Upstream temperature value and SCR downstream temperature values, after SCR upstream temperatures value and SCR downstream temperature values is obtained, and in temperature letter
Number effectively when, calculate determine SCR mean temperature Tscr and SCR mean temperature duration tscr.
4. SCR catalyst degradation calculation method according to claim 1, it is characterized in that：It is determined that aging reference time tc
When, the chemical reaction rate potential quality factor of chemical reaction activation energy and catalyst according to catalyst is tabled look-up and obtains fiducial time
Initial value, looks into fair curve and obtains time complexity curve coefficient according to chemical reaction activation energy modifying factor, the time complexity curve coefficient with
Fiducial time initial value is multiplied, to obtain aging reference time tc of the catalyst under the currently active ageing time Tn.
5. SCR catalyst degradation calculation method according to claim 1, it is characterized in that：The effective temperature Tm storages exist
In eeprom memory, after the currently active aging temperature Tn is obtained, the effective temperature Tm in eeprom memory is replaced by
The currently active aging temperature Tn；When aging coefficient reset signal is received, then by the effective temperature in eeprom memory more
It is changed to initial effective temperature Tnc.
6. SCR catalyst degradation calculation method according to claim 1, it is characterized in that：It is flat according to effective temperature Tm, SCR
Equal temperature Tscr, SCR mean temperature duration tscr and aging reference time tc, it is determined that obtaining the currently active aging temperature
The detailed process of Tn is：
According to effective temperature Tm and aging reference time tc, determine that the corresponding fresh state catalyst of catalyst is averagely warm in SCR
Ageing time t1 under degree Tscr, specially：
T1=tce((Tm-Tscr)/β)
According to ageing time t1, SCR mean temperature duration tscr and aging reference time tc, obtain the currently active aging
Temperature Tn is
Tn=- β (lntc-ln (tscr+t1))+Tscr
Wherein, β is aging correction factor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611248255.5A CN106709255A (en) | 2016-12-29 | 2016-12-29 | SCR catalyst aging computing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611248255.5A CN106709255A (en) | 2016-12-29 | 2016-12-29 | SCR catalyst aging computing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106709255A true CN106709255A (en) | 2017-05-24 |
Family
ID=58906109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611248255.5A Pending CN106709255A (en) | 2016-12-29 | 2016-12-29 | SCR catalyst aging computing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106709255A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111577429A (en) * | 2020-05-08 | 2020-08-25 | 广西玉柴机器股份有限公司 | Optimization method of SCR average temperature algorithm |
| CN114758736A (en) * | 2022-05-07 | 2022-07-15 | 北京理工大学 | Method for calculating activation energy of catalyst of scr device |
| CN115280002A (en) * | 2020-03-12 | 2022-11-01 | 康明斯排放处理公司 | Controller and method for controlling operation of an aftertreatment system based on short-term and long-term cumulative degradation estimates |
-
2016
- 2016-12-29 CN CN201611248255.5A patent/CN106709255A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115280002A (en) * | 2020-03-12 | 2022-11-01 | 康明斯排放处理公司 | Controller and method for controlling operation of an aftertreatment system based on short-term and long-term cumulative degradation estimates |
| CN111577429A (en) * | 2020-05-08 | 2020-08-25 | 广西玉柴机器股份有限公司 | Optimization method of SCR average temperature algorithm |
| CN114758736A (en) * | 2022-05-07 | 2022-07-15 | 北京理工大学 | Method for calculating activation energy of catalyst of scr device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3842625B1 (en) | Method and apparatus for controlling urea crystallization, storage medium and electronic device | |
| EP3009622B1 (en) | Control device, exhaust purification device for internal combustion engine, and method for controlling exhaust purification device | |
| CN106709255A (en) | SCR catalyst aging computing method | |
| CN112240235B (en) | SCR control method and device | |
| CN110821621B (en) | Method for monitoring an SCR catalyst | |
| CN113006913B (en) | Urea crystallization risk early warning method and device, computer equipment and storage medium | |
| CN112576351B (en) | Method, device, equipment and medium for obtaining engine nitrogen oxide model value | |
| CN111677595A (en) | Crystallization processing method, device and post-processing system | |
| CN111396179A (en) | Method and device for determining urea crystal amount in engine | |
| CN110748401B (en) | Method and device for controlling emission of nitrogen oxides | |
| CN109339911B (en) | Control method and system for improving SCR urea crystallization or conversion efficiency reduction | |
| CN106682428A (en) | SCR ammonia storage amount calculating method | |
| CN115306525B (en) | Urea injection control method and device, diesel vehicle and storage medium | |
| CN112567113A (en) | Method for increasing the efficiency of an SCR system and internal combustion engine | |
| KR100992812B1 (en) | System and method for estimation a Selective Catalytic Reduction Catalyst Aging | |
| KR102652182B1 (en) | Method for checking an scr system having at least two metering valves | |
| CN112177738B (en) | Urea consumption monitoring method and diesel engine | |
| CN116771473B (en) | Urea injection amount calculating method, device, vehicle and storage medium | |
| CN113607398B (en) | Method for accurately measuring SCR ammonia injection ratio | |
| CN114837805B (en) | Method and device for determining sulfur content of fuel oil of vehicle, vehicle and storage medium | |
| CN117888983A (en) | Urea injection control method and device, vehicle and storage medium | |
| CN115773172B (en) | HC poisoning judgment method and device in SCR system, electronic equipment and medium | |
| CN115217601B (en) | Method, device and equipment for detecting concentration of NOx in tail gas and storage medium | |
| CN117988962A (en) | Ammonia escape detection method and device and electronic equipment | |
| CN106815413A (en) | SCR temperature field computation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170524 |