CN103016112A - Method and system for controlling emitted dose of urea solution by SCR (Selective Catalytic reduction) - Google Patents
Method and system for controlling emitted dose of urea solution by SCR (Selective Catalytic reduction) Download PDFInfo
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- CN103016112A CN103016112A CN201210552784XA CN201210552784A CN103016112A CN 103016112 A CN103016112 A CN 103016112A CN 201210552784X A CN201210552784X A CN 201210552784XA CN 201210552784 A CN201210552784 A CN 201210552784A CN 103016112 A CN103016112 A CN 103016112A
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- 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
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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
Abstract
The invention provides a method and a system for controlling the emitted dose of a urea solution by SCR (Selective Catalytic Reduction) by taking three parameters, namely NH3 storage amount, NOx conversion efficiency and exhaust gas temperature into account. When the working condition of en engine instantaneously changes, the exhaust gas temperature can possibly and suddenly raise to cause increase of exhaust gas flow, and excessive NH3 escape is caused in the prior art; or when the working condition of the engine changes, the emitted dose of the urea solution is lower to cause insufficiency of the NOx conversion efficiency. Under the conditions that the requirements on the catalyst amount and the NH3 escape amount are definite, the maximum NOx conversion efficiency depends on the catalyst reaction temperature and the exhaust gas flow. According to the control method provided by the invention, a target value of the NOx conversion efficiency and the available NOx conversion efficiency based on the NH3 storage amount are added as closed-loop amendments, so that the emitted dose of the urea solution can be accurately controlled, the NOx conversion efficiency is furthest improved and the NH3 escape amount is reduced.
Description
Technical field
The present invention relates to the engine emission processing technology field, particularly a kind of selective catalytic reduction urea solution jet amount control method and system.
Background technique
Selective catalytic reduction (SCR, Selective Catalytic Reduction) technology is one of main post-processing technology of eliminating nitrogen oxide in the diesel exhaust gas.
Mainly be divided into control unit, urea dosage device and catalytic reaction unit three parts according to function SCR system.
The control unit of SCR system and the control unit of motor (ECU) integrate, be mainly used in carrying out the SCR control strategy, and according to the sensor signals such as ambient temperature, delivery temperature, urea level, urea temperature, urea pressure, nitrogen oxide (NOx) concentration control urea dosage device, so that the urea dosage device is mapped to spraying urea liquid in the exhaust airstream according to demand at regular time and quantity; The urea dosage device mainly comprises urea box, urea supply unit, urea-spray unit, heating module and connecting pipeline and circuit, guarantees abundant atomizing and the decomposition of urea liquid; The catalytic reaction unit mainly comprises SCR catalyzer and encapsulation thereof, and the main harmful components reduction of nitrogen oxide that is used for diesel exhaust gas is the nitrogen G﹠W.
SCR system basic functional principle: exhaust enters the outlet pipe after booster turbine flows out, by the urea-spray unit that is installed on the outlet pipe quantitative aqueous solution of urea is sprayed in the outlet pipe with vaporific form simultaneously, urea droplets issues unboiled water solution and pyrolytic reaction in the high-temp waste gas effect, generate needed reducing agent ammonia (NH3), ammonia (NH3) is reduced to nitrogen (N2) selectively with the main harmful components nitrogen oxide (NOx) in the diesel exhaust gas under the effect of catalyzer.Sometimes cause secondary pollution in order to prevent that too much ammonia (NH3) from escaping, also need to arrange at SCR catalyzer rear and impel ammonia (NH3) to be oxidized to the catalyzer of nitrogen (N2).
The molecular formula of urea is NH2CONH2, at high temperature resolves into NH3 and CO2 after adding water H2O, and this reaction does not need catalytic condition to finish:
NH
2CONH
2+H
2O→2NH
3+CO
2 （1）
NH3 in the SCR catalyst converter and the NO in the exhaust, NO2 reaction produce N2 and H2O:
2NO+2NO
2+4NH
3→4N
2+6H
2O （2）
4NO+O
2+4NH
3→4N
2+6H
2O （3）
2NO
2+O
2+4NH
3→3N
2+6H
2O （4）
For preventing the leakage of ammonia in the whole using process of motor, the catalyst converter of eliminating ammonia need to be set after the SCR catalytic muffler sometimes, NH3 and O2 reaction generates N2 and H2O in this catalyst converter:
4NH
3+3O
2→2N
2+6H
2O （5）
In the prior art, the control of urea injecting quantity mainly is the emitted dose of determining urea liquid by engine emission, engine speed and circulation fuel injection amount.Wherein, from engine emission, can obtain nitrous oxides concentration and exhaust gas flow.Ammonia nitrogen is than obtaining by the MAP of inquiry engine speed and circulation fuel injection amount.The abscissa of this MAP is engine speed, and y coordinate is the circulation fuel injection amount.Can obtain the demand of ammonia by ammonia nitrogen ratio, nitrous oxides concentration, can obtain the urea demand by the demand of ammonia, be calculated again the emitted dose of the urea liquid that needs by the urea demand.
But the power of motor is different, and then corresponding MAP is not identical yet.And, requiring in certain situation at catalyzer and ammonia NH3 escape amount, nitrogen oxide maximum conversion efficient only depends on catalyst reaction temperatures and extraction flow.Therefore, when the operating mode generation instantaneous variation of motor, if row's temperature rise, extraction flow increases, and it is too many to cause easily ammonia to be escaped, and will cause secondary pollution like this.Otherwise if row's temperature drop is low, extraction flow reduces, and the emitted dose of urea liquid causes conversion of nitrogen oxides efficient not enough very little easily.
In sum, the controlling method of urea solution jet amount is accurate not in the prior art, thereby can not reach the transformation efficiency that improves to greatest extent nitrogen oxide, causes easily environmental pollution.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of selective catalytic reduction urea solution jet amount control method and system, can accurately control the urea solution jet amount, thereby improves to greatest extent the transformation efficiency of nitrogen oxide.
The embodiment of the invention provides a kind of selective catalytic reduction urea solution jet amount control method, comprising:
Calculate corresponding nitrogen oxide NOx transformation efficiency by current ammonia NH3 memory space;
Nitrogen oxide NOx transformation efficiency desired value and the described nitrogen oxide NOx transformation efficiency that calculates are compared, obtain the first correction factor; Described nitrogen oxide NOx transformation efficiency desired value and ammonia NH3 memory space preset;
Utilize described the first correction factor correction urea solution jet amount;
Preferably, also comprise:
Detect the upstream delivery temperature of selective catalytic reduction SCR catalytic muffler;
The described upstream delivery temperature of detection and the upstream delivery temperature of upper sense cycle detection are compared, obtain the second correction factor;
Utilize the described urea solution jet amount of described the second correction factor correction.
Preferably, utilize the described urea solution jet amount of described the second correction factor correction, be specially:
The described upstream delivery temperature of detection and the upstream delivery temperature of upper sense cycle detection are done the poor difference that obtains, described difference is converted into described the second correction factor, described the second correction factor is greater than one or less than one coefficient, and described the second correction factor be multiply by described urea solution jet amount.
Preferably, also comprise: the NH3 demand that the urea solution jet amount is corresponding is revised, be specially:
The nitrogen N H3 memory space current according to the condition calculating of motor;
The nitrogen N H3 memory space of calculating and the nitrogen N H3 memory space of demarcating are in advance compared, if the nitrogen N H3 memory space of calculating is then revised ammonia NH3 demand according to the control curve of setting greater than described nitrogen N H3 memory space of demarcating in advance; The abscissa of the control curve of described setting is SCR catalytic muffler upstream delivery temperature, and y coordinate is the coefficient less than, according to coefficient ammonia NH3 demand is revised; Otherwise then do not need ammonia NH3 demand is revised.
Preferably, the upstream delivery temperature of described detection selective catalytic reduction SCR catalytic muffler is specially: obtain by the SCR upstream exhaust gas temperature sensor that is arranged on SCR catalytic muffler upstream.
The embodiment of the invention also provides a kind of selective catalytic reduction urea solution jet amount control system, comprising: nitrogen oxide NOx transformation efficiency computing unit, the first correction factor obtain unit, the first amending unit;
Described nitrogen oxide NOx transformation efficiency computing unit is used for calculating corresponding nitrogen oxide NOx transformation efficiency by current ammonia NH3 memory space;
Described the first correction factor obtains the unit, is used for nitrogen oxide NOx transformation efficiency desired value and the described nitrogen oxide NOx transformation efficiency that calculates are compared, and obtains the first correction factor; Described nitrogen oxide NOx transformation efficiency desired value and ammonia NH3 memory space preset;
Described the first amending unit is used for utilizing described the first correction factor correction urea solution jet amount;
Preferably, also comprise: upstream delivery temperature detection unit, the second correction factor obtain unit and the second amending unit; Described upstream delivery temperature detection unit is for detection of the upstream delivery temperature of selective catalytic reduction SCR catalytic muffler;
Described the second correction factor obtains the unit, is used for the described upstream delivery temperature that will detect and the upstream delivery temperature of upper sense cycle detection and compares, and obtains the second correction factor;
Described the second amending unit is used for utilizing the described urea solution jet amount of described the second correction factor correction.
Preferably, described the second amending unit comprises: difference obtains subelement, coefficient conversion subelement and revises subelement;
Described difference obtains subelement, does the poor difference that obtains for the upstream delivery temperature of the described upstream delivery temperature that will detect and upper sense cycle detection;
Described coefficient conversion subelement is used for described difference is converted into described the second correction factor, and described the second correction factor is greater than one or less than one coefficient;
Described correction subelement is used for described the second correction factor be multiply by described urea solution jet amount.
Preferably, also comprise: nitrogen N H3 memory space computing unit, nitrogen N H3 memory space comparing unit and nitrogen N H3 demand amending unit;
Described nitrogen N H3 memory space computing unit is used for the nitrogen N H3 memory space current according to the condition calculating of motor;
Described nitrogen N H3 memory space comparing unit is used for the nitrogen N H3 memory space that will calculate and the nitrogen N H3 memory space of demarcating in advance and compares;
Described nitrogen N H3 demand amending unit when the nitrogen N H3 of described calculating memory space during greater than described nitrogen N H3 memory space of demarcating in advance, is used for according to the control curve of setting ammonia NH3 demand being revised; The abscissa of the control curve of described setting is SCR catalytic muffler upstream delivery temperature, and y coordinate is the coefficient less than; Coefficient according to y coordinate is revised ammonia NH3 demand; Otherwise then do not need ammonia NH3 demand is revised.
Preferably, described upstream delivery temperature detection unit is realized by the SCR upstream exhaust gas temperature sensor that is arranged on SCR catalytic muffler upstream.
Compared with prior art, the present invention has the following advantages:
SCR urea solution jet amount control method and system that the embodiment of the invention provides have considered NH3 memory space, NOx transformation efficiency and three parameters of delivery temperature.Because operating mode moment of motor, delivery temperature may raise suddenly when changing, cause extraction flow to increase, it is too much to cause like this urea solution jet amount too much to cause NH3 to escape in the prior art, and then causes secondary pollution; When perhaps engine operating condition changed, delivery temperature was lower, and when extraction flow was low, the urea solution jet amount was very few and then cause the NOx transformation efficiency not enough.Because catalyzer and NH3 escape amount require in certain situation, NOx maximum conversion efficient only depends on catalyst reaction temperatures and extraction flow.Therefore, added NOx transformation efficiency desired value in the controlling method that the embodiment of the invention provides and based on the NOx transformation efficiency that has possessed of NH3 memory space as Closed-cycle correction, can realize so the accurate control of urea solution jet amount, improve to greatest extent the NOx transformation efficiency, reduce NH3 escape amount, be conducive to the promotion and application of state V, Europe IV motor.
Description of drawings
Fig. 1 is SCR urea solution jet amount control method embodiment one flow chart provided by the invention;
Fig. 2 is SCR urea solution jet amount control method embodiment two flow charts provided by the invention;
Fig. 3 is selective catalytic reduction urea solution jet amount control system embodiment one schematic representation provided by the invention;
Fig. 4 is selective catalytic reduction urea solution jet amount control system embodiment two schematic representation provided by the invention;
Fig. 5 is the schematic representation of the second amending unit in the selective catalytic reduction urea solution jet amount control system provided by the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
Referring to Fig. 1, this figure is SCR urea solution jet amount control method embodiment one flow chart provided by the invention.
The selective catalytic reduction urea solution jet amount control method that present embodiment provides comprises:
S101: calculate corresponding nitrogen oxide NOx transformation efficiency by current ammonia NH3 memory space;
The purpose of S101 is to calculate the NOx transformation efficiency that has possessed by current NH3 memory space, because the NH3 self that is attached on the equipment can transform a part of NOx, the NOx transformation efficiency that has namely possessed.The NOx transformation efficiency that possessed of deduction just can obtain the remaining NOx transformation efficiency that needs again like this.
S102: nitrogen oxide NOx transformation efficiency desired value and the described nitrogen oxide NOx transformation efficiency that calculates are compared, obtain the first correction factor; Described nitrogen oxide NOx transformation efficiency desired value and ammonia NH3 memory space preset;
Need to prove that NOx transformation efficiency desired value is set in advance, is to test in advance according to the operating mode of motor to obtain.But in fact do not need so large NOx transformation efficiency (because the NOx transformation efficiency that exists reality to possess), therefore need to revise.
S103: utilize described the first correction factor correction urea solution jet amount.
The makeover process of S101-S103 mainly is based on the correction that NH3 memory space and two parameters of NOx transformation efficiency are carried out.
The SCR urea solution jet amount control method that the embodiment of the invention provides has been considered NH3 memory space, NOx transformation efficiency and three parameters of delivery temperature.Because operating mode moment of motor, delivery temperature may raise suddenly when changing, cause extraction flow to increase, it is too much to cause like this urea solution jet amount too much to cause NH3 to escape in the prior art, and then causes secondary pollution; When perhaps engine operating condition changed, delivery temperature was lower, and when extraction flow was low, the urea solution jet amount was very few and then cause the NOx transformation efficiency not enough.Because catalyzer and NH3 escape amount require in certain situation, NOx maximum conversion efficient only depends on catalyst reaction temperatures and extraction flow.Therefore, added NOx transformation efficiency desired value in the controlling method that the embodiment of the invention provides and based on the NOx transformation efficiency that has possessed of NH3 memory space as Closed-cycle correction, can realize so the accurate control of urea solution jet amount, improve to greatest extent the NOx transformation efficiency, reduce NH3 escape amount, be conducive to the promotion and application of state V, Europe IV motor.
Referring to Fig. 2, this figure is SCR urea solution jet amount control method embodiment two flow charts provided by the invention.
The below introduces the process of revising based on the delivery temperature of SCR catalytic muffler.Because delivery temperature and extraction flow have direct relation, come the urea solution jet amount is revised so detect delivery temperature.
S104: the upstream delivery temperature that detects selective catalytic reduction SCR catalytic muffler;
S105: the upstream delivery temperature that the described upstream delivery temperature that will detect and a upper sense cycle detect compares, and obtains the second correction factor;
Need to prove, be to carry out in the cycle to the detection of SCR catalytic muffler upstream delivery temperature, and the temperature value that current period detects compares with the temperature value that upper one-period detects, and judgement is rising or has reduced, and then obtains the second correction factor.The second correction factor be greater than one or less than a coefficient of one.
The upstream delivery temperature of described detection selective catalytic reduction SCR catalytic muffler is specially: obtain by the SCR upstream exhaust gas temperature sensor that is arranged on SCR catalytic muffler upstream.
S106: utilize the described urea solution jet amount of described the second correction factor correction.
Utilize the described urea solution jet amount of described the second correction factor correction, be specially:
The described upstream delivery temperature of detection and the upstream delivery temperature of upper sense cycle detection are done the poor difference that obtains, described difference is converted into described the second correction factor, described the second correction factor is greater than one or less than one coefficient, and described the second correction factor be multiply by described urea solution jet amount.
Need to prove that the urea solution jet amount that S106 revises is the revised urea solution jet amount of S103.
Like this, just more accurate through revised urea solution jet amount.
Be understandable that utilize the second correction factor that the urea solution jet amount is revised and can be revised, namely S104-S106 can put upside down with the sequencing of S101-S103 before the first correction factor.
The present invention also provides a kind of method, continues referring to Fig. 2, and the difference of present embodiment and embodiment of the method one is to have added the correction to NH3 demand corresponding to urea solution jet amount;
Namely before S101, also comprise:
S201: the nitrogen N H3 memory space current according to the condition calculating of motor;
S202: the nitrogen N H3 memory space of calculating and the nitrogen N H3 memory space of demarcating are in advance compared, if the nitrogen N H3 memory space of calculating is then revised ammonia NH3 demand according to the control curve of setting greater than described nitrogen N H3 memory space of demarcating in advance; The abscissa of the control curve of described setting is SCR upstream delivery temperature temperature, and y coordinate is the coefficient less than; Coefficient according to y coordinate is revised ammonia NH3 demand; Otherwise then do not need ammonia NH3 demand is revised.
Need to prove that S203-S208 is identical with S101-S106 among the embodiment one respectively, does not repeat them here.According to current SCR upstream delivery temperature and ammonia NH3 memory space, calculate a correction factor, revise the size of NH3 demand, thereby be converted to the urea solution jet amount that needs injection, prevent that urea solution jet from too much causing ammonia NH3 to escape, perhaps the urea solution jet amount is very few, and the situation of transformation efficiency deficiency occurs.
The below introduces the relation between NH3 demand and the urea solution jet amount.
In the exhaust emissions of motor, when NO occupied the majority, the reaction coefficient between NOx and the NH3 was 1:1; And 1mol urea can decomposite the NH3 of 2mol, and the mass concentration of urea liquid is 32.5%.Because in the engine exhaust among the NOx is NO more than 90%, therefore, above-mentioned relation is suitable for the calculating among the application.
NOx initial ejection amount and delivery temperature according to motor (being called for short former machine) during calculating are set ammonia nitrogen than the size of (NSR), generally NSR are set between 0.6-0.8.
Conversion relation formula between NOx flow, NH3 demand and the urea demand is as follows:
The NOx flow:
The NH3 demand:
The urea demand:
In formula (6), (7) and (8), Q
EGBe extraction flow, unit is kg/h; V
NOx, ppmBe NOx concentration in the exhaust, unit is 10
-6M
EG, M
Adblue, M
NH3Be respectively the molal weight of exhaust, urea, NOx and NH3, unit is g/mol;
The molal weight of NH3, NO, NO2 and urea Adblue is respectively 17,30,46,60; f
aBe correction factor (comprising engine temperature correction, catalyst temperature correction, deteriorated correction etc.); f
sBe NH3 and NOx reaction coefficient ratio, herein f
sEqual 1.
The method of the SCR urea solution jet amount control method that provides based on above-described embodiment, the present invention also provides SCR urea solution jet amount control system, describes its constituent element in detail below in conjunction with specific embodiment.
Referring to Fig. 3, this figure is selective catalytic reduction urea solution jet amount control system embodiment one schematic representation provided by the invention.
The selective catalytic reduction urea solution jet amount control system that the embodiment of the invention provides comprises: nitrogen oxide NOx transformation efficiency computing unit 100, the first correction factor obtain unit 200, the first amending unit 300;
Described nitrogen oxide NOx transformation efficiency computing unit 100 is used for calculating corresponding nitrogen oxide NOx transformation efficiency by current ammonia NH3 memory space;
NOx transformation efficiency computing unit 100 purposes are to calculate the NOx transformation efficiency that has possessed by current NH3 memory space, because the NH3 self that is attached on the equipment can transform a part of NOx, the NOx transformation efficiency that has namely possessed.The NOx transformation efficiency that possessed of deduction just can obtain the remaining NOx transformation efficiency that needs again like this.
Described the first correction factor obtains unit 200, is used for nitrogen oxide NOx transformation efficiency desired value and the described nitrogen oxide NOx transformation efficiency that calculates are compared, and obtains the first correction factor; Described nitrogen oxide NOx transformation efficiency desired value and ammonia NH3 memory space preset;
Need to prove that NOx transformation efficiency desired value is set in advance, is to test in advance according to the operating mode of motor to obtain.But in fact do not need so large NOx transformation efficiency (because the NOx transformation efficiency that exists reality to possess), therefore need to revise.
Described the first amending unit 300 is used for utilizing described the first correction factor correction urea solution jet amount;
Above-mentioned makeover process mainly is based on the correction that NH3 memory space and two parameters of NOx transformation efficiency are carried out.
The SCR urea solution jet amount control system that the embodiment of the invention provides has been considered NH3 memory space, NOx transformation efficiency and three parameters of delivery temperature.Because operating mode moment of motor, delivery temperature may raise suddenly when changing, cause extraction flow to increase, it is too much to cause like this urea solution jet amount too much to cause NH3 to escape in the prior art, and then causes secondary pollution; When perhaps engine operating condition changed, delivery temperature was lower, and when extraction flow was low, the urea solution jet amount was very few and then cause the NOx transformation efficiency not enough.Because catalyzer and NH3 escape amount require in certain situation, NOx maximum conversion efficient only depends on catalyst reaction temperatures and extraction flow.Therefore, added NOx transformation efficiency desired value in the controlling method that the embodiment of the invention provides and based on the NOx transformation efficiency that has possessed of NH3 memory space as Closed-cycle correction, can realize so the accurate control of urea solution jet amount, improve to greatest extent the NOx transformation efficiency, reduce NH3 escape amount, be conducive to the promotion and application of state V, Europe IV motor.
The below introduces the process of revising based on the delivery temperature of SCR catalytic muffler.Because delivery temperature and extraction flow have direct relation, come the urea solution jet amount is revised so detect delivery temperature.
Referring to Fig. 4, this figure is selective catalytic reduction urea solution jet amount control system embodiment two schematic representation provided by the invention.
The system that present embodiment provides also comprises: upstream delivery temperature detection unit 400, the second correction factor obtain unit 500 and the second amending unit 600;
Described upstream delivery temperature detection unit 400 is for detection of the upstream delivery temperature of selective catalytic reduction SCR catalytic muffler;
Need to prove that described upstream delivery temperature detection unit 400 is realized by the SCR upstream exhaust gas temperature sensor that is arranged on SCR catalytic muffler upstream.
Described the second correction factor obtains unit 500, is used for the described upstream delivery temperature that will detect and the upstream delivery temperature of upper sense cycle detection and compares, and obtains the second correction factor;
Need to prove, be to carry out in the cycle to the detection of SCR catalytic muffler upstream delivery temperature, and the temperature value that current period detects compares with the temperature value that upper one-period detects, and judgement is rising or has reduced, and then obtains the second correction factor.The second correction factor be greater than one or less than a coefficient of one.
Described the second amending unit 600 is used for utilizing the described urea solution jet amount of described the second correction factor correction.
Need to prove that the urea solution jet amount that the second amending unit 600 is revised is the first amending unit 300 revised urea solution jet amounts.
Like this, just more accurate through revised urea solution jet amount.
The present invention also provides a kind of control system on the basis of system embodiment two, continue referring to Fig. 4.
The difference of present embodiment and system embodiment one is to have added the correction to the NH3 memory space;
The SCR urea solution jet amount control system that present embodiment provides also comprises: nitrogen N H3 memory space computing unit 700, nitrogen N H3 memory space comparing unit 800 and nitrogen N H3 demand amending unit 900;
Described nitrogen N H3 memory space computing unit 700 is used for the nitrogen N H3 memory space current according to the condition calculating of motor;
Described nitrogen N H3 memory space comparing unit 800 is used for the nitrogen N H3 memory space that will calculate and the nitrogen N H3 memory space of demarcating in advance and compares;
Described nitrogen N H3 demand amending unit 900 when the nitrogen N H3 of described calculating memory space during greater than described nitrogen N H3 memory space of demarcating in advance, is used for according to the control curve of setting nitrogen N H3 demand being revised; The abscissa of the control curve of described setting is the upstream delivery temperature of SCR catalytic muffler, and y coordinate is the coefficient less than, according to the coefficient of y coordinate the NH3 demand is revised; Otherwise then do not need nitrogen N H3 demand is revised.
Need to prove that it is exactly indirectly the urea solution jet amount to be revised that the NH3 demand is revised, the physical relationship formula is referring to formula (6), (7) and (8).
Upstream delivery temperature and ammonia NH3 memory space according to current SCR catalytic muffler, calculate a correction factor, revise the size of NH3 demand, thereby be converted to the urea solution jet amount that needs injection, prevent that urea solution jet from too much causing ammonia NH3 to escape, perhaps the urea solution jet amount is very few, and the situation of transformation efficiency deficiency occurs.
Referring to Fig. 5, this figure is the schematic representation of the second amending unit in the selective catalytic reduction urea solution jet amount control system provided by the invention.
Described the second amending unit that present embodiment provides comprises: difference obtains subelement 601, coefficient conversion subelement 602 and revises subelement 603;
Described difference obtains subelement 601, does the poor difference that obtains for the upstream delivery temperature of the described upstream delivery temperature that will detect and upper sense cycle detection;
Described coefficient conversion subelement 602 is used for described difference is converted into described the second correction factor, and described the second correction factor is greater than one or less than one coefficient;
Described correction subelement 603 is used for described the second correction factor be multiply by described urea solution jet amount.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet is not to limit the present invention.Any those of ordinary skill in the art, do not breaking away from the technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention according to any simple modification, equivalent variations and the modification that technical spirit of the present invention is done above embodiment, all still belongs in the scope of technical solution of the present invention protection.
Claims (10)
1. a selective catalytic reduction urea solution jet amount control method is characterized in that, comprising:
Calculate corresponding nitrogen oxide NOx transformation efficiency by current ammonia NH3 memory space;
Nitrogen oxide NOx transformation efficiency desired value and the described nitrogen oxide NOx transformation efficiency that calculates are compared, obtain the first correction factor; Described nitrogen oxide NOx transformation efficiency desired value and ammonia NH3 memory space preset;
Utilize described the first correction factor correction urea solution jet amount.
2. selective catalytic reduction urea solution jet amount control method according to claim 1 is characterized in that, also comprises:
Detect the upstream delivery temperature of selective catalytic reduction SCR catalytic muffler;
The described upstream delivery temperature of detection and the upstream delivery temperature of upper sense cycle detection are compared, obtain the second correction factor;
Utilize the described urea solution jet amount of described the second correction factor correction.
3. selective catalytic reduction urea solution jet amount control method according to claim 2 is characterized in that, utilizes the described urea solution jet amount of described the second correction factor correction, is specially:
The described upstream delivery temperature of detection and the upstream delivery temperature of upper sense cycle detection are done the poor difference that obtains, described difference is converted into described the second correction factor, described the second correction factor is greater than one or less than one coefficient, and described the second correction factor be multiply by described urea solution jet amount.
4. each described selective catalytic reduction urea solution jet amount control method is characterized in that according to claim 1-3, also comprises: the NH3 demand that the urea solution jet amount is corresponding is revised, be specially:
The nitrogen N H3 memory space current according to the condition calculating of motor;
The nitrogen N H3 memory space of calculating and the nitrogen N H3 memory space of demarcating are in advance compared, if the nitrogen N H3 memory space of calculating is then revised ammonia NH3 demand according to the control curve of setting greater than described nitrogen N H3 memory space of demarcating in advance; The abscissa of the control curve of described setting is SCR catalytic muffler upstream delivery temperature, and y coordinate is the coefficient less than, according to coefficient ammonia NH3 demand is revised; Otherwise then do not need ammonia NH3 demand is revised.
5. selective catalytic reduction urea solution jet amount control method according to claim 2, it is characterized in that, the upstream delivery temperature of described detection selective catalytic reduction SCR catalytic muffler is specially: obtain by the SCR upstream exhaust gas temperature sensor that is arranged on SCR catalytic muffler upstream.
6. a selective catalytic reduction urea solution jet amount control system is characterized in that, comprising: nitrogen oxide NOx transformation efficiency computing unit, the first correction factor obtain unit and the first amending unit;
Described nitrogen oxide NOx transformation efficiency computing unit is used for calculating corresponding nitrogen oxide NOx transformation efficiency by current ammonia NH3 memory space;
Described the first correction factor obtains the unit, is used for nitrogen oxide NOx transformation efficiency desired value and the described nitrogen oxide NOx transformation efficiency that calculates are compared, and obtains the first correction factor; Described nitrogen oxide NOx transformation efficiency desired value and ammonia NH3 memory space preset;
Described the first amending unit is used for utilizing described the first correction factor correction urea solution jet amount.
7. selective catalytic reduction urea solution jet amount control system according to claim 6 is characterized in that, also comprises: upstream delivery temperature detection unit, the second correction factor obtain unit and the second amending unit;
Described upstream delivery temperature detection unit is for detection of the upstream delivery temperature of selective catalytic reduction SCR catalytic muffler;
Described the second correction factor obtains the unit, is used for the described upstream delivery temperature that will detect and the upstream delivery temperature of upper sense cycle detection and compares, and obtains the second correction factor;
Described the second amending unit is used for utilizing the described urea solution jet amount of described the second correction factor correction.
8. selective catalytic reduction urea solution jet amount control system according to claim 7 is characterized in that, described the second amending unit comprises: difference obtains subelement, coefficient conversion subelement and revises subelement;
Described difference obtains subelement, does the poor difference that obtains for the upstream delivery temperature of the described upstream delivery temperature that will detect and upper sense cycle detection;
Described coefficient conversion subelement is used for described difference is converted into described the second correction factor, and described the second correction factor is greater than one or less than one coefficient;
Described correction subelement is used for described the second correction factor be multiply by described urea solution jet amount.
9. selective catalytic reduction urea solution jet amount control system according to claim 6 is characterized in that, also comprises: nitrogen N H3 memory space computing unit, nitrogen N H3 memory space comparing unit and nitrogen N H3 demand amending unit;
Described nitrogen N H3 memory space computing unit is used for the nitrogen N H3 memory space current according to the condition calculating of motor;
Described nitrogen N H3 memory space comparing unit is used for the nitrogen N H3 memory space that will calculate and the nitrogen N H3 memory space of demarcating in advance and compares;
Described nitrogen N H3 demand amending unit when the nitrogen N H3 of described calculating memory space during greater than described nitrogen N H3 memory space of demarcating in advance, is used for according to the control curve of setting ammonia NH3 demand being revised; The abscissa of the control curve of described setting is SCR catalytic muffler upstream delivery temperature, and y coordinate is the coefficient less than; Coefficient according to y coordinate is revised ammonia NH3 demand; Otherwise then do not need ammonia NH3 demand is revised.
10. selective catalytic reduction urea solution jet amount control system according to claim 7 is characterized in that, described upstream delivery temperature detection unit is realized by the SCR upstream exhaust gas temperature sensor that is arranged on SCR catalytic muffler upstream.
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Effective date of registration: 20170711 Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Co-patentee after: Weichai Power Air Purification Technology Co. Ltd. Patentee after: Weichai Dynamic Co., Ltd. Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: Weichai Dynamic Co., Ltd. |