CN104514603A - SCR (Selective Catalytic Reduction) control method and device - Google Patents
SCR (Selective Catalytic Reduction) control method and device Download PDFInfo
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- CN104514603A CN104514603A CN201410837974.5A CN201410837974A CN104514603A CN 104514603 A CN104514603 A CN 104514603A CN 201410837974 A CN201410837974 A CN 201410837974A CN 104514603 A CN104514603 A CN 104514603A
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- 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
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Abstract
The invention discloses an SCR (Selective Catalytic Reduction) control method and an SCR (Selective Catalytic Reduction) control device. The method includes the steps of: obtaining a target conversion efficiency of a catalyst under the current working condition of an engine; obtaining the theoretical maximal conversion efficiency of the catalyst under the current working condition of the engine; comparing the target conversion efficiency with the theoretical maximal conversion efficiency, and selecting the smaller one as the final target conversion efficiency; determining the injection quantity of urea according to the final target conversion efficiency. According to the method, correction on the theoretical maximal conversion efficiency of the catalyst is increased, the target conversion efficiency of the catalyst under various working conditions is compared with the theoretical maximal conversion efficiency, and the smaller one is selected to determine the injection quantity of the urea, so that the injection quantities of the urea under various working conditions can be accurately controlled, and thereby the urea is prevented from being excessively injected under various working conditions of the engine, and the risk of ammonia leakage is reduced.
Description
Technical field
The present invention relates to tail gas disposal technique field, particularly relate to controlling method and the device of a kind of SCR.
Background technique
Along with countries in the world are to the constantly strict requirement of motor Abgasgesetz, engine exhaust post-processing technology also development.China will implement in full state IV Abgasgesetz on January 1st, 2015, in order to meet the restriction of state IV Abgasgesetz to soot and nitrogen oxide, motor mainly utilizes SCR (Selective Catalytic Reduction, selective catalytic reduction system operating) to reduce the discharge of nitrogen oxide.
The basic functional principle of SCR is that quantitative aqueous solution of urea sprays in outlet pipe with vaporific form by urea-spray unit, urea droplets issues unboiled water solution and pyrolytic reaction in high-temp waste gas effect, reducing agent ammonia needed for generation, nitrogen oxide is reduced to nitrogen selectively by ammonia under catalyst action.
And do not participate in the ammonia of reaction in SCR, can be discharged in air, form NH_3 leakage, too much NH_3 leakage not only causes the waste of urea, and can cause serial side reaction, causes secondary pollution problem simultaneously.
At present, during practical operation, the urea injecting quantity of SCR is determined by following method: the main Maipu that can be determined catalytic conversion efficiency by engine speed, fuel delivery per cycle, inquire about the catalytic conversion efficiency corresponding with motor current working, as targeted transformation efficiency, determine urea injecting quantity according to this targeted transformation efficiency.
Because the transformation efficiency of catalyzer is also relevant to the factor such as delivery temperature, extraction flow, only cannot the catalytic conversion efficiency of accurate motor current working according to said method, the theoretical maximum conversion efficiency of determined catalytic conversion efficiency higher than catalyzer under current working may be there is, thus the urea injecting quantity calculated is higher than actual urea demand, and then the urea of unnecessary injection is caused to form NH_3 leakage.
In view of this, how to avoid spraying excess urea under each operating mode of motor, reducing NH_3 leakage risk, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide controlling method and the device of a kind of SCR, under each operating mode of motor can be avoided, spray excess urea, reduce NH_3 leakage risk.
For solving the problems of the technologies described above, the invention provides the controlling method of a kind of SCR, comprising:
Under obtaining motor current working, the targeted transformation efficiency of catalyzer;
Under obtaining motor current working, the theoretical maximum conversion efficiency of catalyzer;
More described targeted transformation efficiency and described theoretical maximum conversion efficiency, choose smaller as final goal transformation efficiency;
According to final goal transformation efficiency determination urea injecting quantity.
The controlling method of this SCR, add the correction of the theoretical maximum conversion efficiency of catalyzer, the targeted transformation efficiency of each operating mode catalyzer and theoretical maximum conversion efficiency are compared, choose smaller and determine urea injecting quantity, owing to considering the theoretical maximum conversion efficiency of catalyzer under each operating mode, accurately can control the urea injecting quantity of each operating mode, thus spray excess urea under avoiding each operating mode of motor, reduce the risk of NH_3 leakage.
Preferably, described targeted transformation efficiency is the theory target transformation efficiency of catalyzer.
Preferably, under obtaining motor current working, the theory target transformation efficiency of catalyzer and its modifying factor; Described targeted transformation efficiency is the product of described theory target transformation efficiency and described modifying factor.
Preferably, described modifying factor from preset catalytic conversion efficiency correction factor with engine exhaust temperature and extraction flow change Maipu figure obtain.
Preferably, described theory target transformation efficiency from preset catalytic conversion efficiency with engine speed and fuel delivery per cycle change Maipu figure obtain.
Preferably, described theoretical maximum conversion efficiency obtains from the theoretical maximum conversion efficiency of the catalyzer preset with the Maipu figure of engine exhaust temperature and air speed change.
The present invention also provides the control gear of a kind of SCR, comprising:
Collecting unit, for obtaining the targeted transformation efficiency of catalyzer under motor current working and theoretical maximum conversion efficiency;
Control unit, for the size of more described targeted transformation efficiency and described theoretical maximum conversion efficiency, and determines urea injecting quantity according to smaller.
This device is consistent with the principle of said method, can reach identical technique effect.
Preferably, described collecting unit also under obtaining motor current working, the modifying factor of the targeted transformation efficiency of catalyzer;
Described control unit comprises amending unit, and described amending unit is used for obtaining revised targeted transformation efficiency according to described modifying factor and described targeted transformation efficiency;
Described control unit is used for more described revised targeted transformation efficiency and described theoretical maximum conversion efficiency, and determines urea injecting quantity according to smaller.
Preferably, described collecting unit comprises monitoring cell and searches unit;
Described monitoring cell is for monitoring the current rotating speed of motor, fuel delivery per cycle, delivery temperature, extraction flow and air speed;
Described unit of searching is for searching the targeted transformation efficiency corresponding with described rotating speed and described fuel delivery per cycle based on the catalytic conversion efficiency Maipu figure preset; Modifying factor Maipu figure based on the catalytic conversion efficiency preset searches the modifying factor corresponding with described delivery temperature and described extraction flow; The theoretical maximum conversion efficiency corresponding with described delivery temperature and described air speed is searched based on the catalyzer preset theoretical maximum conversion efficiency Maipu figure.
Accompanying drawing explanation
Fig. 1 is the flow chart of the first embodiment of controlling method of SCR provided by the present invention;
Fig. 2 is the control principle schematic diagram of the controlling method of SCR shown in Fig. 1;
Fig. 3 is the flow chart of controlling method the second embodiment of SCR provided by the present invention;
Fig. 4 is the control principle schematic diagram of the controlling method of SCR shown in Fig. 3.
Embodiment
Core of the present invention is to provide controlling method and the device of a kind of SCR, sprays excess urea under can avoiding each operating mode of motor, reduces NH_3 leakage risk.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
For ease of understanding and describing succinct, hereafter in conjunction with controlling method and the device description of SCR, beneficial effect no longer repeats to discuss.
Please refer to Fig. 1-2, Fig. 1 is the flow chart of the first embodiment of controlling method of SCR provided by the present invention; Fig. 2 is the control principle schematic diagram of the controlling method of SCR shown in Fig. 1.
In this embodiment, the controlling method of SCR comprises the steps:
Under S11, acquisition motor current working, the targeted transformation efficiency of catalyzer and theoretical maximum conversion efficiency;
The present embodiment provides the control gear of SCR, and this device can arrange collecting unit, and this collecting unit is for obtaining the targeted transformation efficiency of catalyzer under motor current working and theoretical maximum conversion efficiency.
In concrete scheme, described targeted transformation efficiency is the theory target transformation efficiency of catalyzer, can from preset catalytic conversion efficiency with engine speed and fuel delivery per cycle change Maipu figure obtain; Similarly, described theoretical maximum conversion efficiency theoretical maximum conversion efficiency can obtain with the Maipu figure of engine exhaust temperature and air speed change from the catalyzer preset.
Here, air speed refers to the ratio of exhaust volume flow and SCR catalyst volume.
Above-mentioned each Maipu figure can be obtained by little sample testing engine bench test, also can be obtained by simulation calculation.
Correspondingly, the collecting unit of described device can comprise monitoring cell and search unit.
Wherein, monitoring cell is for monitoring the current rotating speed of motor, fuel delivery per cycle, delivery temperature and extraction flow; The current air speed of motor can obtain according to the catalyst volume of extraction flow and the SCR preset.
Search unit for searching the theory target transformation efficiency corresponding with described rotating speed and described fuel delivery per cycle based on the Maipu figure of the catalytic conversion efficiency preset, and search the theoretical maximum conversion efficiency corresponding with described delivery temperature and described air speed based on the Maipu figure of the theoretical maximum conversion efficiency of the catalyzer preset.
Wherein, each parameter of the current working of motor, i.e. rotating speed, fuel delivery per cycle, delivery temperature and extraction flow, can directly read from the monitoring cell of engine system, also can arrange special monitoring cell and obtain separately.
Wherein, collecting unit also can arrange storage unit, is pre-stored in this storage unit, in order to searching cell call by the Maipu figure of the Maipu of catalyst volume, Above-mentioned catalytic agent transformation efficiency figure and the theoretical maximum conversion efficiency of catalyzer.Certainly, actual when arranging, also aforementioned for catalyst body sum Maipu figure can be pre-stored in the storage unit of engine system.
S12, more described targeted transformation efficiency and described theoretical maximum conversion efficiency, choose smaller as final goal transformation efficiency;
S13, according to described final goal transformation efficiency determination urea injecting quantity.
The control gear of SCR also comprises control unit, and after obtaining described targeted transformation efficiency and described theoretical maximum conversion efficiency, this control unit can the size of both comparisons, and chooses smaller as final goal transformation efficiency, to determine urea injecting quantity.
The working principle of SCR is: a certain amount of aqueous solution of urea of urea-spray unit injection is in waste pipe, urea droplets issues unboiled water solution and pyrolytic reaction in high-temperature exhaust air effect, reducing agent ammonia needed for generation, the nitrogen oxide in exhaust is reduced to nitrogen selectively by ammonia under catalyst action.
From the working principle of above-mentioned SCR, if the transformation efficiency of catalyzer under knowing motor current working, then can calculate required ammonia amount, again, nitrogen is generated by urea, thus can calculate urea injecting quantity according to required nitrogen amount.
That is, above-mentioned determine the final goal transformation efficiency of catalyzer after, urea injecting quantity can be determined accordingly; Urea-spray method for determination of amount is described above, no longer repeats here.
Above-mentioned theory targeted transformation efficiency is the catalytic conversion efficiency obtained according to the current working of motor, after obtaining theory target transformation efficiency, contrast with the theoretical maximum conversion efficiency of catalyzer under current exhaust gas temperature and air speed again, choose smaller as final goal transformation efficiency determination urea injecting quantity.
The method and device, existing basis adds the correction of the theoretical maximum conversion efficiency of catalyzer, to take into account under different operating mode delivery temperature and air speed to the impact of catalytic conversion efficiency, compared with background technique, avoid because targeted transformation efficiency is greater than the theoretical maximum conversion efficiency of catalyzer and the NH_3 leakage that overspray urea causes, the urea injecting quantity of each operating mode can be controlled more accurately, reduce the risk of NH_3 leakage.
Further improvement can be made for above-described embodiment.
Understand with reference to figure 3-4; Fig. 3 is the flow chart of controlling method the second embodiment of SCR provided by the present invention; Fig. 4 is the control principle schematic diagram of the controlling method of SCR shown in Fig. 3.
In this embodiment, the controlling method of SCR comprises the steps:
Under S21, acquisition motor current working, the modifying factor of the theory target transformation efficiency of catalyzer, theoretical maximum conversion efficiency and theory target transformation efficiency;
S22, obtain targeted transformation efficiency according to described theory target transformation efficiency and described modifying factor;
S23, more described targeted transformation efficiency and described theoretical maximum conversion efficiency, choose smaller as final goal transformation efficiency;
S24, according to described final goal transformation efficiency determination urea injecting quantity.
From above-mentioned detailed process, the step of the method that this embodiment provides is substantially identical with the first embodiment, between step S11 and step S12, just add the correction of the theory target transformation efficiency to catalyzer.
Because the transformation efficiency of catalyzer affects by delivery temperature (affecting the activity of catalyzer) and extraction flow (affecting the reaction time of catalyzer and nox in exhaust), so after obtaining the theory target transformation efficiency of catalyzer, can also revise it based on delivery temperature and extraction flow, using revised theory target transformation efficiency as targeted transformation efficiency, improve accuracy.
Particularly, when obtaining the theory target transformation efficiency of catalyzer under motor current working and theoretical maximum conversion efficiency, also obtain the modifying factor of theory target transformation efficiency.
In concrete scheme, described modifying factor can from preset catalytic conversion efficiency correction factor with engine exhaust temperature and extraction flow change Maipu figure obtain.
Similarly, this Maipu figure can be obtained by little sample testing engine bench test, also can be obtained by simulation calculation.
Correspondingly, the unit of searching of the collecting unit of described device searches the modifying factor corresponding with the delivery temperature that monitoring cell is monitored and extraction flow based on the modifying factor Maipu figure of catalytic conversion efficiency.
The control unit of described device also comprises amending unit, this amending unit obtains targeted transformation efficiency according to modifying factor and theory target transformation efficiency, and by this targeted transformation efficiency and the comparison of theoretical maximum conversion efficiency, determine urea injecting quantity according to the smaller in both.
Wherein, targeted transformation efficiency is the product of modifying factor and theory target transformation efficiency.
Compared with the first embodiment, this embodiment add catalyzer theoretical maximum conversion efficiency correction basis on, also done qualitative correction to the targeted transformation efficiency of catalyzer, targeted transformation efficiency when have adjusted too high or too low for temperature, create a further reduction the risk of NH_3 leakage.
Above the controlling method of a kind of SCR provided by the present invention and device are all described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (9)
1. a controlling method of SCR, comprising:
Under obtaining motor current working, the targeted transformation efficiency of catalyzer;
It is characterized in that, also comprise:
Under obtaining motor current working, the theoretical maximum conversion efficiency of catalyzer;
More described targeted transformation efficiency and described theoretical maximum conversion efficiency, choose smaller as final goal transformation efficiency;
According to final goal transformation efficiency determination urea injecting quantity.
2. method according to claim 1, is characterized in that, described targeted transformation efficiency is the theory target transformation efficiency of catalyzer.
3. method according to claim 1, is characterized in that, under obtaining motor current working, and the theory target transformation efficiency of catalyzer and its modifying factor; Described targeted transformation efficiency is the product of described theory target transformation efficiency and described modifying factor.
4. method according to claim 3, is characterized in that, described modifying factor from preset catalytic conversion efficiency correction factor with engine exhaust temperature and extraction flow change Maipu figure obtain.
5. the method according to any one of claim 2 to 4, is characterized in that, described theory target transformation efficiency from preset catalytic conversion efficiency with engine speed and fuel delivery per cycle change Maipu figure obtain.
6. the method according to any one of Claims 1-4, is characterized in that, described theoretical maximum conversion efficiency obtains from the theoretical maximum conversion efficiency of the catalyzer preset with the Maipu figure of engine exhaust temperature and air speed change.
7. a control gear of SCR, is characterized in that, comprising:
Collecting unit, for obtaining the targeted transformation efficiency of catalyzer under motor current working and theoretical maximum conversion efficiency;
Control unit, for the size of more described targeted transformation efficiency and described theoretical maximum conversion efficiency, and determines urea injecting quantity according to smaller.
8. device according to claim 7, is characterized in that, described collecting unit also under obtaining motor current working, the modifying factor of the targeted transformation efficiency of catalyzer;
Described control unit comprises amending unit, and described amending unit is used for obtaining revised targeted transformation efficiency according to described modifying factor and described targeted transformation efficiency;
Described control unit is used for more described revised targeted transformation efficiency and described theoretical maximum conversion efficiency, and determines urea injecting quantity according to smaller.
9. device according to claim 8, is characterized in that, described collecting unit comprises monitoring cell and searches unit;
Described monitoring cell is for monitoring the current rotating speed of motor, fuel delivery per cycle, delivery temperature, extraction flow and air speed;
Described unit of searching is for searching the targeted transformation efficiency corresponding with described rotating speed and described fuel delivery per cycle based on the catalytic conversion efficiency Maipu figure preset; Modifying factor Maipu figure based on the catalytic conversion efficiency preset searches the modifying factor corresponding with described delivery temperature and described extraction flow; The theoretical maximum conversion efficiency corresponding with described delivery temperature and described air speed is searched based on the catalyzer preset theoretical maximum conversion efficiency Maipu figure.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108371888A (en) * | 2018-03-13 | 2018-08-07 | 成都市润天祥环保科技有限公司 | Prevent the SCR denitration system control method of urea overspray |
| CN108760328A (en) * | 2018-05-31 | 2018-11-06 | 安徽江淮汽车集团股份有限公司 | A kind of gasoline engine catalyst space velocities test method |
| CN110987440A (en) * | 2019-12-17 | 2020-04-10 | 凯龙高科技股份有限公司 | SCR catalyst NH3 storage test method |
| CN111441846A (en) * | 2020-03-28 | 2020-07-24 | 潍坊势为环保有限公司 | Method and device for correcting urea injection amount of SCR (Selective catalytic reduction) system and SCR system |
| CN115263508A (en) * | 2022-08-09 | 2022-11-01 | 一汽解放汽车有限公司 | Multi-engine tail gas aftertreatment system, control method, device and equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907012A (en) * | 2009-03-06 | 2010-12-08 | 德国曼商用车辆股份公司 | Adjust the method that the reductant metering adding quantity carries out selective catalytic reduction |
| CN102619601A (en) * | 2012-04-18 | 2012-08-01 | 潍柴动力扬州柴油机有限责任公司 | SCR (Selective Catalytic Reduction) system of electrical control diesel engine and control method of SCR system |
| CN102844533A (en) * | 2010-01-01 | 2012-12-26 | 康明斯知识产权公司 | Engine and exhaust aftertreatment control |
| DE102012005383A1 (en) * | 2012-03-16 | 2013-09-19 | Daimler Ag | Method for checking quality of reducing agent containing ammonia in free or bound form, involves setting reducing agent dosage corresponding to dosing ratios and determining actual values for nitrogen oxide conversion |
| CN103470353A (en) * | 2013-07-25 | 2013-12-25 | 同济大学 | Diesel engine SCR (selective catalytic reduction) system control method based on urealysis efficiency |
| WO2014032686A1 (en) * | 2012-08-31 | 2014-03-06 | Volvo Truck Corporation | Method and system for estimating reagent quality |
-
2014
- 2014-12-29 CN CN201410837974.5A patent/CN104514603B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907012A (en) * | 2009-03-06 | 2010-12-08 | 德国曼商用车辆股份公司 | Adjust the method that the reductant metering adding quantity carries out selective catalytic reduction |
| CN102844533A (en) * | 2010-01-01 | 2012-12-26 | 康明斯知识产权公司 | Engine and exhaust aftertreatment control |
| DE102012005383A1 (en) * | 2012-03-16 | 2013-09-19 | Daimler Ag | Method for checking quality of reducing agent containing ammonia in free or bound form, involves setting reducing agent dosage corresponding to dosing ratios and determining actual values for nitrogen oxide conversion |
| CN102619601A (en) * | 2012-04-18 | 2012-08-01 | 潍柴动力扬州柴油机有限责任公司 | SCR (Selective Catalytic Reduction) system of electrical control diesel engine and control method of SCR system |
| WO2014032686A1 (en) * | 2012-08-31 | 2014-03-06 | Volvo Truck Corporation | Method and system for estimating reagent quality |
| CN103470353A (en) * | 2013-07-25 | 2013-12-25 | 同济大学 | Diesel engine SCR (selective catalytic reduction) system control method based on urealysis efficiency |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108371888A (en) * | 2018-03-13 | 2018-08-07 | 成都市润天祥环保科技有限公司 | Prevent the SCR denitration system control method of urea overspray |
| CN108760328A (en) * | 2018-05-31 | 2018-11-06 | 安徽江淮汽车集团股份有限公司 | A kind of gasoline engine catalyst space velocities test method |
| CN110987440A (en) * | 2019-12-17 | 2020-04-10 | 凯龙高科技股份有限公司 | SCR catalyst NH3 storage test method |
| CN111441846A (en) * | 2020-03-28 | 2020-07-24 | 潍坊势为环保有限公司 | Method and device for correcting urea injection amount of SCR (Selective catalytic reduction) system and SCR system |
| CN115263508A (en) * | 2022-08-09 | 2022-11-01 | 一汽解放汽车有限公司 | Multi-engine tail gas aftertreatment system, control method, device and equipment |
| CN115263508B (en) * | 2022-08-09 | 2023-11-21 | 一汽解放汽车有限公司 | Tail gas aftertreatment system, control method, device and equipment for multiple engines |
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