CN114439587B - Accurate prediction NH 3 Leakage amount control method - Google Patents

Accurate prediction NH 3 Leakage amount control method Download PDF

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CN114439587B
CN114439587B CN202210005313.0A CN202210005313A CN114439587B CN 114439587 B CN114439587 B CN 114439587B CN 202210005313 A CN202210005313 A CN 202210005313A CN 114439587 B CN114439587 B CN 114439587B
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CN114439587A (en
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陈旭
陈小迅
冯坦
陈镇
石浩
李鹏远
陈楚国
魏国龙
赵梦媛
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Dongfeng Commercial Vehicle Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F01N11/005—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus the temperature or pressure being estimated, e.g. by means of a theoretical model
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention discloses a method for accurately predicting NH 3 A method for controlling leakage amount. The method comprises the steps of according to the original NOx at the current moment, the final NOx at the current moment, the original NOx at the last moment and the last momentAccurate prediction of NH by etched final NOx, current conversion efficiency and last-time conversion efficiency 3 Leakage amount, NH to be predicted 3 The leakage is filtered. The invention utilizes the time lag characteristic of the SCR system and uses NO X Accurate prediction of NH from sensor measurements 3 A method of leakage.

Description

Accurate prediction NH 3 Leakage amount control method
Technical Field
The invention belongs to the technical field of vehicle aftertreatment systems, and particularly relates to a vehicle provided with a Urea-SCR aftertreatment system. In particular to an accurate NH prediction 3 A method for controlling leakage amount.
Background
The current Urea-SCR technology is considered to reduce NO in diesel engines for vehicles X The most effective method for discharging is that after urea aqueous solution with the mass fraction of 32.5% is sprayed into an exhaust pipe by a urea spraying system, the urea aqueous solution is converted into NH through processes of wall collision, evaporation, hydrolysis, pyrolysis and the like 3 Then reacts with NOx to reduce the exhaust NOx emission of the diesel engine for vehicles.
With increasingly stringent emission regulations, NOx emission limits are becoming lower and, therefore, aftertreatment systems require more accurate urea injection control strategies to achieve high NOx conversion efficiency and low NH 3 Leakage. In order to control urea injection more accurately, accurate NH measurement is required 3 Leakage, excessive urea injection in pursuit of high NOx conversion efficiency is avoided.
The prior art scheme is to predict NH according to the cross sensitivity of a NOx sensor 3 Leakage, when there is NH in the exhaust 3 At this time, the NOx sensor will be NH 3 Detected as NOx, if there is no NOx in the exhaust gas but only NH 3 Leakage, the NOx sensor measures NH 3 Leakage. The main prediction method is to predict under the reverse operation condition, because no NOx is discharged under the reverse operation condition, if the measured indication number of the NOx sensor exceeds a set value, NH is predicted 3 Leakage.
The disadvantages of the prior art are:
(1) Because the volume of the post-processor is too large and the airflow has time delay, the concentration of NOx in the back-dragging working condition is not necessarily 0, the NOx emission before the back-dragging working condition is likely to be caused, and NH is easy to cause 3 Mispredictions of leaks.
(2) The SCR catalyst does not always react NOx completely (for example, fuel with high sulfur content leads to reduction of catalyst conversion efficiency), but the SCR catalyst has adsorption effect, NOx which is not completely reacted is adsorbed in the catalyst, and the SCR catalyst may release NOx under the reverse driving condition to lead to higher NOx concentration and easy NH 3 Mispredictions of leaks.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provide a method for accurately predicting NH 3 A method for controlling leakage amount.
The technical scheme adopted by the invention is as follows: accurate prediction NH 3 The leakage quantity control method comprises accurately predicting NH according to original NOx at the current moment, final NOx at the current moment, original NOx at the last moment, final NOx at the last moment, current conversion efficiency and conversion efficiency at the last moment 3 Leakage amount, NH to be predicted 3 The leakage is filtered.
At the satisfaction of NH 3 In case of leakage prediction conditions, NH is performed 3 Prediction of leakage and NH 3 Filtering of leakage prediction values.
The NH is 3 Leakage prediction conditionThe method comprises the following steps:
(1) Consider NO X The sensor has a relatively low test accuracy at small concentrations, so that NH is ensured 3 Accuracy of leakage prediction, requiring original machine NOx>A target value A;
(2) Considering that the exhaust gas flow is too small, the SCR time lag is too large, so in order to ensure NH 3 Accuracy of leakage prediction, which requires exhaust gas flow>A target value B;
(3) Taking into account the DOC temperature affects the DOC conversion efficiency and thus the NO/NO 2 Ratio of NO/NO 2 The ratio will affect NO X Final row, thus to ensure NH 3 The accuracy of leakage prediction requires that the DOC outlet temperature is within a set range T1;
(4) Considering the SCR temperature affects the SCR conversion efficiency and thus the NO X Final row, thus to ensure NH 3 The accuracy of leakage prediction requires that the SCR inlet temperature is within a set range T2;
(5) Considering the ammonia storage amount influences the SCR conversion efficiency, thereby influencing NO X Final row, thus to ensure NH 3 Accuracy of leakage prediction, required ammonia storage>Target value C.
The range of the target value A is 10-1000 ppm; the range of the target value B is 50-1000 kg/h; the range of T1 is 200-400 ℃; the range of T2 is 200-400 ℃; the target value C is in the range of 1000 to 40000mg.
NH according to SCR catalyst 3 Adsorption characteristics, considered NH 3 The variation of the slip within 1s is very slow and even negligible, so that the NH at the present and the last moment is considered 3 Leakage is the same. To reduce the influence of fluctuation of working conditions and further improve NH 3 Prediction accuracy of the leakage amount.
The predicted NH 3 The leakage method comprises the following steps: according to the formula:
NO Xsensor ＝NO Xin *(1-K*η)+NH 3slip
NO′ Xsensor ＝NO′ Xin *(1-K*η′)+NH′ 3slip
obtaining NH predicted at the current time 3 Leakage value:
Figure BDA0003456416860000041
wherein NO Xsensor For final NO at the current moment X Value of NO Xsensor ' Final NOx value, NO at time 1s before Xin For the original NOx value at the current moment, NO Xin ' is the original NOx value at the previous 1s moment, K is the model error, eta is NO X Conversion efficiency model value, η' is NOx conversion efficiency of the previous second, NH 3slip NH predicted for current time 3 Leakage value. Accurate NH prediction based on SCR system time lag and NOx cross sensitivity 3 Leakage. Because of SCR catalyst vs. NH 3 Adsorption effect, NH 3 The leakage change was slow, and it can be considered that NH 3 The variation of the slip within 1s is very slow and even negligible, so that the NH at the present and the last moment is considered 3 Leakage is the same.
The final exhaust NOx value is measured by a NOx sensor arranged at an outlet of the post-processor, the original engine NOx value is measured by a NOx sensor arranged at an inlet of the post-processor, the NOx conversion efficiency model value is obtained by checking a two-dimensional map according to SCR temperature and exhaust gas flow, the SCR temperature is measured by a temperature sensor, the exhaust gas flow is obtained by summing oil consumption and air inlet flow, the oil consumption is obtained by reading the two-dimensional map by rotating speed and torque percentage, and the air inlet flow is measured by a flow sensor.
In order to further improve the accuracy, the filtering processing method includes: the filtered NH is calculated according to the following formula 3 Leakage amount:
Y n ＝k*NH 3slip +(1-k)Y n-1
wherein Y is n Representing filtered NH 3 Leakage, k is the filter coefficient (0-1), Y n-1 Is the NH after the last time 3 Leakage amount, Y n-1 The initial value of (1) is 0.
The invention is based on SCR catalysisAgent pair NH 3 Adsorption characteristics, considered NH 3 The variation of the slip within 1s is very slow and even negligible, so that the NH at the present and the last moment is considered 3 The leakage is the same, and then NH is accurately predicted according to the original NOx at the current moment, the final NOx at the current moment, the original NOx at the last moment, the final NOx at the last moment, the current conversion efficiency and the conversion efficiency at the last moment 3 Leakage amount, predicted NH 3 The leakage quantity is filtered to reduce the influence of fluctuation of working conditions, so that NH (NH) can be further improved 3 Prediction accuracy of the leakage amount.
The beneficial effects of the invention are as follows: by utilizing time lag characteristic of SCR system and NO X Accurate prediction of NH from sensor measurements 3 Is a leak of (2).
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
As shown in FIG. 1, the method comprises accurately predicting NH according to the original NOx at the current moment, the final NOx at the current moment, the original NOx at the last moment, the final NOx at the last moment, the current conversion efficiency and the conversion efficiency at the last moment 3 Leakage amount, NH to be predicted 3 The leakage is filtered.
At the satisfaction of NH 3 In case of leakage prediction conditions, NH is performed 3 Prediction of leakage and NH 3 Filtering of leakage prediction values.
The NH is 3 The leakage prediction conditions were:
(1) Consider NO X The sensor has a relatively low test accuracy at small concentrations, so that NH is ensured 3 Accuracy of leakage prediction, requiring original machine NOx>A target value A;
(2) Considering that the exhaust gas flow is too small, the SCR time lag is too large, so in order to ensure NH 3 Accuracy of leakage prediction, which requires exhaust gas flow>A target value B;
(3) Taking into account the DOC temperature affects the DOC conversion efficiency and thus the NO/NO 2 Ratio of NO/NO 2 The ratio will affect NO X Final row, thus to ensure NH 3 The accuracy of leakage prediction requires that the DOC outlet temperature is within a set range T1;
(4) Considering the SCR temperature affects the SCR conversion efficiency and thus the NO X Final row, thus to ensure NH 3 The accuracy of leakage prediction requires that the SCR inlet temperature is within a set range T2;
(5) Considering the ammonia storage amount influences the SCR conversion efficiency, thereby influencing NO X Final row, thus to ensure NH 3 Accuracy of leakage prediction, required ammonia storage>Target value C.
The range of the target value A is 10-1000 ppm; the range of the target value B is 50-1000 kg/h; the range of T1 is 200-400 ℃; the range of T2 is 200-400 ℃; the target value C is in the range of 1000 to 40000mg.
NH according to SCR catalyst 3 Adsorption characteristics, considered NH 3 The variation of the slip within 1s is very slow and even negligible, so that the NH at the present and the last moment is considered 3 Leakage is the same. To reduce the influence of fluctuation of working conditions and further improve NH 3 Prediction accuracy of the leakage amount.
The predicted NH 3 The leakage method comprises the following steps: according to the formula:
NO Xsensor ＝NO Xin *(1-K*η)+NH 3slip
NO′ Xsensor ＝NO′ Xin *(1-K*η′)+NH′ 3slip
obtaining NH predicted at the current time 3 Leakage value:
Figure BDA0003456416860000071
wherein NO Xsensor For final NO at the current moment X Value of NO Xsensor ' is the front 1Final NOx value at s time, NO Xin For the original NOx value at the current moment, NO Xin ' is the original NOx value at the previous 1s moment, K is the model error, eta is NO X Conversion efficiency model value, η' is NOx conversion efficiency of the previous second, NH 3slip NH predicted for current time 3 Leakage value. Accurate NH prediction based on SCR system time lag and NOx cross sensitivity 3 Leakage. Because of SCR catalyst vs. NH 3 Adsorption effect, NH 3 The leakage change was slow, and it can be considered that NH 3 The variation of the slip within 1s is very slow and even negligible, so that the NH at the present and the last moment is considered 3 Leakage is the same.
The final exhaust NOx value is measured by a NOx sensor arranged at the outlet of the post-processor, the original engine NOx value is measured by a NOx sensor arranged at the inlet of the post-processor, the NOx conversion efficiency model value is obtained by looking up a two-dimensional map according to the SCR temperature and the exhaust gas flow (shown in table 1), the SCR temperature is measured by a temperature sensor, the exhaust gas flow is obtained by summing the oil consumption and the air intake flow, the oil consumption is obtained by reading the two-dimensional map according to the rotation speed and the torque percentage (shown in table 2), and the air intake flow is measured by a flow sensor.
Figure BDA0003456416860000072
Figure BDA0003456416860000081
TABLE 1
Figure BDA0003456416860000082
TABLE 2
In order to further improve the accuracy, the filtering processing method includes: the filtered NH is calculated according to the following formula 3 Leakage amount:
Y n ＝k*NH 3slip +(1-k)Y n-1
wherein Y is n Representing filtered NH 3 Leakage, k is the filter coefficient (0-1), Y n-1 Is the NH after the last time 3 Leakage amount, Y n-1 The initial value of (1) is 0. Illustrating: k is 0.1, and NH can be calculated in the first second 3slip 5, Y of the first second n =0.1×5+0.9×0=0.5, NH for the second 3slip 10, Y of the second n Let us wait for Y at each subsequent time instant by analogy with 0.1×10+0.9×0.5=1.45 n 。
The invention relates to a method for preparing NH by using SCR catalyst 3 Adsorption characteristics, considered NH 3 The variation of the slip within 1s is very slow and even negligible, so that the NH at the present and the last moment is considered 3 The leakage is the same, and then NH is accurately predicted according to the original NOx at the current moment, the final NOx at the current moment, the original NOx at the last moment, the final NOx at the last moment, the current conversion efficiency and the conversion efficiency at the last moment 3 Leakage amount, predicted NH 3 The leakage quantity is filtered to reduce the influence of fluctuation of working conditions, so that NH (NH) can be further improved 3 Prediction accuracy of the leakage amount.
The beneficial effects of the invention are as follows: by utilizing time lag characteristic of SCR system and NO X Accurate prediction of NH from sensor measurements 3 A method of leakage.
What is not described in detail in this specification is prior art known to those skilled in the art.

Claims (9)

1. Accurate prediction NH 3 The leakage amount control method is characterized in that: comprises accurately predicting NH according to the original NOx value at the current moment, the final NOx value at the current moment, the original NOx value at the last moment, the final NOx value at the last moment, the current conversion efficiency and the conversion efficiency at the last moment 3 Leakage amount, NH to be predicted 3 The leakage quantity is filtered;
the predicted NH 3 The method for leakage amount comprises the following steps: according to the formula:
NO Xsensor ＝NO Xin *(1-K*η)+NH 3slip
NO′ Xsensor ＝NO′ Xin *(1-K*η)+NH′ 3slip
obtaining NH predicted at the current time 3 Leakage amount:
Figure FDA0004110456500000011
wherein NO Xsensor For final NO at the current moment X Value of NO Xsensor ' Final NOx value, NO at time 1s before Xin For the original NOx value at the current moment, NO Xin ' is the original NOx value at the previous 1s moment, K is the model error, eta is NO X Conversion efficiency model value, η' is NOx conversion efficiency at the previous 1s time, NH 3slip NH predicted for current time 3 Leakage amount, NH' 3slip NH for prediction of the first 1s time 3 Leakage amount.
2. An accurate prediction of NH according to claim 1 3 The leakage amount control method is characterized in that: at the satisfaction of NH 3 In case of leakage prediction conditions, NH is performed 3 Prediction of leakage and NH 3 Filtration of leakage.
3. An accurate prediction of NH according to claim 2 3 The leakage amount control method is characterized in that: the NH is 3 The leakage prediction conditions were:
(1) Original machine NOx value > target value A;
(2) Exhaust gas flow > target value B;
(3) The DOC outlet temperature is within a set range T1;
(4) The SCR inlet temperature is within a set range T2;
(5) Ammonia storage > target value C.
4. An accurate prediction of NH according to claim 3 3 Leakage control method, its specialThe method is characterized in that: the range of the target value A is 10-1000 ppm; the target value B is 50-1000 kg/h.
5. An accurate prediction of NH according to claim 3 3 The leakage amount control method is characterized in that: the range of T1 is 200-400 ℃; the range of T2 is 200-400 ℃.
6. An accurate prediction of NH according to claim 3 3 The leakage amount control method is characterized in that: the target value C is in the range of 1000 to 40000mg.
7. An accurate prediction of NH according to claim 1 3 The leakage amount control method is characterized in that: the final exhaust NOx value is measured by a NOx sensor arranged at the outlet of the post-processor, the original engine NOx value is measured by a NOx sensor arranged at the inlet of the post-processor, and the NOx conversion efficiency model value is obtained by checking a two-dimensional map according to the SCR temperature and the exhaust gas flow.
8. An accurate prediction of NH according to claim 7 3 The leakage amount control method is characterized in that: the SCR temperature is measured by a temperature sensor, the exhaust gas flow is obtained by summing the oil consumption and the air inlet flow, the oil consumption is obtained by reading a two-dimensional map from the rotation speed and the torque percentage, and the air inlet flow is measured by a flow sensor.
9. An accurate prediction of NH according to claim 1 3 The leakage amount control method is characterized in that: the filtering processing method comprises the following steps: the filtered NH is calculated according to the following formula 3 Leakage amount:
Y n ＝k*NH 3slip +(1-k)Y n-1
wherein Y is n Representing filtered NH 3 Leakage, k is the filter coefficient (0-1), Y n-1 Is the NH after the last time 3 Leakage amount, Y n-1 The initial value of (1) is 0.
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US8596042B2 (en) * 2008-08-28 2013-12-03 Delphi International Operations Luxembourg S.A.R.L. System and method for selective catalytic reduction control
US8495862B2 (en) * 2010-10-06 2013-07-30 GM Global Technology Operations LLC System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems
CN104612791B (en) * 2015-01-28 2017-02-22 东风商用车有限公司 Method and system for controlling urea solution spraying amount in closed loop mode through SCR system
US9790835B1 (en) * 2016-04-25 2017-10-17 Cummins Emission Solutions Inc. Catalyst failure detection based combined ammonia to NOx ratios, conversion inefficiency values and ammonia slip values
CN113202605B (en) * 2021-04-09 2022-07-22 东风汽车股份有限公司 Method for calculating ammonia leakage amount of SCR (Selective catalytic reduction) aftertreatment system

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JP2010053702A (en) * 2008-08-26 2010-03-11 Delphi Technologies Inc Selective catalytic reduction control system and method

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