CN102588055A - Independent type SCR (selective catalytic reduction) metered injection control method and system - Google Patents
Independent type SCR (selective catalytic reduction) metered injection control method and system Download PDFInfo
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- CN102588055A CN102588055A CN2012100448362A CN201210044836A CN102588055A CN 102588055 A CN102588055 A CN 102588055A CN 2012100448362 A CN2012100448362 A CN 2012100448362A CN 201210044836 A CN201210044836 A CN 201210044836A CN 102588055 A CN102588055 A CN 102588055A
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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
- Y02T10/12—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
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Abstract
The invention discloses an independent type SCR (selective catalytic reduction) metered injection control method. The method comprises the following steps: step 10: acquiring dynamic pressure, static pressure and exhaust temperature of exhausted air, and calculating the mass flow in an exhaust unit time according to the dynamic pressure, the static pressure and the exhaust temperature of the exhausted air; step 20: according to the mass flow in the exhaust unit time calculated in the step 10, determining the mass of NOX in the exhausted air in unit time to obtain the required mass of (NH2)2; step 30: obtaining the required mass of the total (NH2)2CO aqueous solution according to the concentration of a (NH2)2CO aqueous solution; and step 40: controlling a (NH2)2CO injection device, and injecting according to the mass of the (NH2)2CO aqueous solution calculated in the step 30. The method can accurately determine the required urea injection quantity in various working conditions and environments so as to realize the requirement of exhaust rules on NOx and can also be applied to diesel engines using mechanical fuel injectors. The invention also discloses an independent type SCR metered injection control system by using the control method.
Description
Technical field
The present invention relates to the engine emission processing technology field, particularly be applied to the free-standing SCR metered injection controlling method of diesel engine.The invention still further relates to the free-standing SCR metered injection control system that has adopted above-mentioned controlling method.
Background technique
At present, the quantity of the large diesel engine of China, marine diesel engine and industrial diesel engine is very many, and the discharging of these diesel engines all rests on the level of Abgasgesetz state I and state II mostly.If will reach state IV standards, must carry out exhaust aftertreatment, to reduce the discharging of NOx, SCR (SCR) is considered to reduce NOx and discharges one of otherwise effective technique the most.
Generally speaking, moment of torsion and the tach signal of SCR control system through the obtaining motor emitted dose of calculating urea.But because most of oil sprayers that large diesel engine and engineering machinery machine are used all are mechanical, and positive injector can't provide moment of torsion and tach signal for the SCR control system.
To this, notice of authorization number is the vehicle-mounted SCR metering and ejecting system of variable with NOx in the exhaust for the utility model patent specification of 201329254Y discloses a kind of.
Though this system can be applied to above-mentioned diesel engine with positive injector; But owing to be that variable is confirmed the urea-spray amount only with the NOx in the exhaust; The variation of not considering exhaust pressure, delivery temperature is to exhaust density or say the influence of mass flow rate in the exhaust unit time; Because the mass flow rate of exhaust is determining the emitted dose of urea liquid,, do not reach the requirement of final reduction NOx discharging so this technology can not all accurately be controlled the emitted dose of aqueous solution of urea under various environment.
In addition, this technology is higher relatively to the requirement of NOx concentration sensor, has increased cost.
Therefore, how under various operating modes and environment, can both confirm the emitted dose of required urea accurately, reaching the requirement of Abgasgesetz to NOx, and be applicable to the diesel engine that uses positive injector, be the present technical issues that need to address of those skilled in the art.
Summary of the invention
First purpose of the present invention provides a kind of free-standing SCR metered injection controlling method.This method can both be confirmed the emitted dose of required urea accurately under various operating modes and environment, thereby reaches the requirement of Abgasgesetz to NOx, and is applicable to the diesel engine that uses positive injector.
Second purpose of the present invention provides a kind of free-standing SCR metered injection control system that has adopted above-mentioned controlling method.
In order to realize above-mentioned first purpose, the present invention provides a kind of free-standing SCR metered injection controlling method, may further comprise the steps:
Step 10: obtain dynamic pressure, static pressure and the delivery temperature of exhaust, and draw the mass flow rate of exhaust unit time according to dynamic pressure, static pressure and the delivery temperature calculating of exhaust;
Step 20: the mass flow rate of the exhaust unit time that calculates according to above-mentioned steps 10, confirm in the unit time NO in the exhaust
XQuality, draw required (NH
2)
2The quality of CO;
Step 30: according to (NH
2)
2The concentration of the CO aqueous solution draws required total (NH
2)
2The quality of the CO aqueous solution;
Step 40: control (NH
2)
2(the NH that the CO injection apparatus calculates according to step 30
2)
2CO aqueous solution quality is sprayed.
Preferably, said step 10 may further comprise the steps:
Step 11: utilize sensor to obtain the dynamic pressure P of exhaust
Moving, static pressure P
Quiet, delivery temperature T, and calculate P
Always=P
Moving+ P
Quiet
Step 12:, get the density p=m/V=P of exhaust according to formula: PV=mRgT
Always/ RgT;
Step 13: according to formula: (P+ ρ gz)+(ρ v
2)/2=C gets exhaust v=(2P
Moving/ ρ)
1/2, wherein P+ ρ gz is static pressure P
Quiet, (1/2) * ρ v
2Be dynamic pressure P
Moving, C is stagnation pressure P
Always
Step 14: the v that ρ that obtains according to step 12 and step 13 obtain, the mass flow rate m=vS ρ of exhaust unit time, wherein S is the cross-section area of outlet pipe.
Preferably, calculate NO in the interior exhaust of unit time in the said step 20
XThe formula of quality is W
(NOx)=mQ * 10
-6/ A, wherein Q is NO
XThe NO that concentration sensor records
XConcentration value, A are the molal weight of exhaust.
Preferably, the value of said A is 29kg/kmol.
Preferably, in the said step 30, according to NH
3Generative process and NOx catalytic reduction chemical equation calculate the amount of substance X and the W of the urea of wastage in bulk or weight
(NOx)Corresponding relation;
According to (NH
2)
2The CO molal weight is 60kg/mol, draws required (NH
2)
2CO mass M=60Xkg;
According to (NH
2)
2The concentration B of the CO aqueous solution and formula W
(NOx)=mQ * 10
-6/ A draws required total (NH
2)
2The mass M of the CO aqueous solution
The aqueous solution
Preferably, in said step 30, set NO and NO in the exhaust
XMol ratio be 9: 1, NO and NO in the exhaust
XAmount of substance be respectively 0.9W
(NOx)Kmol and 0.1W
(NOx)Kmol calculates the amount of substance X=0.5W of the urea of wastage in bulk or weight
(NOx)
According to (NH
2)
2The concentration B of the CO aqueous solution and formula W
(NOx)=mQ * 10
-6/ A draws required total (NH
2)
2The quality of the CO aqueous solution is M
The aqueous solution=60 * mQ * 10
-6/ 2 * 29 * Bkg.
Preferably, the value of said B is 32.5%, draws required total (NH
2)
2The quality of the CO aqueous solution is M
The aqueous solution=3.18 * mQ * 10
-6Kg.
In order to realize above-mentioned second purpose, the present invention also provides a kind of free-standing SCR metered injection control system, comprises absolute pressure transducer, dynamic pressure transducer, exhaust gas temperature sensor and NO
XConcentration sensor, each said sensor is connected with controller on circuit, and the controlling method of said controller is above-mentioned each described free-standing SCR metered injection controlling method.
Free-standing SCR metered injection controlling method provided by the present invention; Composite factor in conjunction with the dynamic pressure of outlet pipe, static pressure, delivery temperature, NOx concentration is confirmed the urea-spray amount; Signal through each sensor carries out computational analysis according to system's designed method; Draw the peak pulse duration of PWM; And then the emitted dose of regulating urea, having changed original SCR control system needs Engine ECU to obtain the mode of moment of torsion, tach signal, can reach the order ground that can both confirm the emitted dose of required urea at the various environment of various operating modes (high temperature, plateau, high and cold) down more accurately; To reach the requirement of Abgasgesetz, be applicable to the large diesel engine that uses positive injector, the transformation of engineering machinery to the NOx discharge amount.
Free-standing SCR metered injection control system provided by the present invention has adopted above-mentioned controlling method, because above-mentioned controlling method has above-mentioned technique effect, adopts the free-standing SCR metered injection control system of this controlling method also should possess the corresponding techniques effect.
Description of drawings
Fig. 1 is the open loop control flow chart of free-standing SCR metered injection controlling method provided by the present invention.
Embodiment
Core of the present invention provides a kind of free-standing SCR metered injection controlling method.This method can both be confirmed the emitted dose of required urea accurately under various operating modes and environment, thereby reaches the requirement of Abgasgesetz to NOx, and is applicable to the diesel engine that uses positive injector.
Another core of the present invention provides a kind of free-standing SCR metered injection control system that has adopted above-mentioned controlling method.
In order to make those skilled in the art person understand the present invention program better, the present invention is done further detailed description below in conjunction with accompanying drawing and embodiment.
Please refer to Fig. 1, Fig. 1 is the open loop control flow chart of free-standing SCR metered injection controlling method provided by the present invention.
In a kind of embodiment, free-standing SCR metered injection controlling method provided by the invention may further comprise the steps:
Step 10: obtain dynamic pressure, static pressure and the delivery temperature of exhaust, and draw the mass flow rate of exhaust unit time according to dynamic pressure, static pressure and the delivery temperature calculating of exhaust.
Specific as follows:
Step 11: utilize sensor to obtain the dynamic pressure P of exhaust
Moving, static pressure P
Quiet, delivery temperature T, and calculate P
Always=P
Moving+ P
QuietThe molal weight of getting exhaust is 29kg/kmol, and then gas constant Rg is a definite value, the acquisition of can tabling look-up, and wherein the sectional area of outlet pipe is made as S.
Step 12: for quality is the desirable exhaust of m, and according to ideal-gas equation PV=mRgT, the density p calculation equation that can get exhaust is: ρ=m/V=P
Always/ RgT.
Step 13: desirable exhaust can be approximated to be energy conservation in the flow process of outlet pipe, then can be according to Bernoulli's equation: (P+ ρ gz)+(ρ v
2)/2=C, wherein P+ ρ gz is static pressure P
Quiet, (1/2) * ρ v
2Be dynamic pressure P
Moving, C is stagnation pressure P
Always, because P
MovingFor known quantity then can get speed v=(2P
Moving/ ρ)
1/2
Step 14: the mass flow rate m=vS ρ that can get the exhaust unit time.
Step 20: according to NH
3Generative process and NOx catalytic reduction reaction principle can be derived the representation of aqueous solution of urea theory demands amount.The mass flow rate of known diesel exhaust gas is m (kg/h), and the concentration of urea liquid is 32.5%, NO
XThe NO that concentration sensor records
XConcentration value is Qppm.
Accomplish through following reactional equation from being generated to of ammonia with the reaction of NOx:
The first step: aqueous solution of urea evaporation precipitated urea particle
(NH
2)
2CO (aqueous solution) → (NH
2)
2CO (solid-state)+H
2O (gaseous state) (1)
Second step: the urea pyrolysis generates equimolar ammonia and cyanic acid (HNCO)
(NH
2)
2CO (solid-state)=NH
3(gaseous state)+HNCO (gaseous state) (2)
The 3rd step: the further hydrolysis of cyanic acid generates equimolar ammonia and carbon dioxide
HNCO (gaseous state)=NH
3(gaseous state)+CO
2(gaseous state) (3)
The 4th step: NO
XCatalytic reduction reaction
4NH
3+4NO+O
2＝4N
2+6H
2O (4)
2NH3+NO+NO
2＝2N
2+3H
2O (5)
Under the prerequisite of above known quantity, can suppose:
1): NO and NO in the diesel exhaust gas
XMol ratio be 9: 1;
2): the SCR catalyst converter has desirable selectivity and catalysis characteristics;
3): (1)～(5) reaction is a complete reaction.
Can get NO under a certain operating mode in the exhaust and NO thus
2Eliminating needed urea amount fully is to confirm.
The mass flow rate of the exhaust unit time that is calculated by step 10 is m kg, then can get NO in the exhaust in the unit time
XAmount of substance W can be expressed as:
W
(NOx)＝mQ×10
-6/29kmol (6)
Get NO and NO in the exhaust
XAmount of substance be respectively 0.9W
(NOx)Kmol and 0.1W
(NOx)Kmol, according to chemical equation (2)～(5) passable go out following corresponding relationship formula:
(NH
2)
2CO～NO
2～NO
1 1 1
X
1 0.1W
(NOx)?X
2
(NH
2)
2CO～2NO
1 2
X
3 0.9W
(NOx)-X
2
In the formula: X1: the amount of substance of the required urea of (5) formula complete reaction
X2: the amount of substance of the required NO of (5) formula complete reaction
X3: (4) formula fully should need the amount of substance of urea
Solve: X
1=0.1W
(NOx), X
2=0.1W
(NOx), X
3=0.4W
(NOx)
The amount of substance of the urea of wastage in bulk or weight is: X=X
1+ X
3=0.5W
(NOx)(kmol)
Because (NH
2)
2The CO molal weight is 60kg/mol, then required (NH
2)
2The CO mass M does
M＝60X?kg
Step 30: by known aqueous solution of urea be 32.5% and formula (6) quality that can get required total aqueous solution of urea be:
M
The aqueous solution=3.18mQ * 10
-6Kg
Step 40: control (NH
2)
2(the NH that the CO injection apparatus calculates according to step 30
2)
2CO aqueous solution quality is sprayed.
Because the variation of exhaust pressure, delivery temperature is all to exhaust density or say that mass flow rate is influential in the exhaust unit time, and the mass flow rate of exhaust is determining the emitted dose of aqueous solution of urea, the emitted dose of aqueous solution of urea can directly have influence on the discharging of NOx.The present invention combines dynamic pressure, static pressure (absolute pressure), the delivery temperature of outlet pipe, the composite factor of NOx concentration to confirm the urea-spray amount.Can both confirm the order ground of the emitted dose of required urea more accurately down to reach, thereby satisfy the requirement of Abgasgesetz the NOx discharge amount at the various environment of various operating modes (high temperature, plateau, high and cold).
Above-mentioned free-standing SCR metered injection controlling method only is a kind of preferred version, specifically is not limited thereto, and can make pointed adjustment according to actual needs on this basis, thereby obtain different embodiment.Because mode in the cards is more, just illustrate no longer one by one here.
Except above-mentioned controlling method, the present invention also provides a kind of free-standing SCR metered injection control system, comprises absolute pressure transducer, dynamic pressure transducer, exhaust gas temperature sensor and NO
XConcentration sensor, each said sensor is connected with controller on circuit, and the controlling method of said controller is a free-standing SCR metered injection controlling method mentioned above, and all the other structures please refer to existing technology, and this paper repeats no more.
More than free-standing SCR metered injection control method provided by the present invention and system are described in detail.Used concrete example among this paper principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand core concept of the present invention.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (8)
1. a free-standing SCR metered injection controlling method is characterized in that, may further comprise the steps:
Step 10: obtain dynamic pressure, static pressure and the delivery temperature of exhaust, and draw the mass flow rate of exhaust unit time according to dynamic pressure, static pressure and the delivery temperature calculating of exhaust;
Step 20: the mass flow rate of the exhaust unit time that calculates according to above-mentioned steps 10, confirm in the unit time NO in the exhaust
XQuality, draw required (NH
2)
2The quality of CO;
Step 30: according to (NH
2)
2The concentration of the CO aqueous solution draws required total (NH
2)
2The quality of the CO aqueous solution;
Step 40: control (NH
2)
2(the NH that the CO injection apparatus calculates according to step 30
2)
2CO aqueous solution quality is sprayed.
2. free-standing SCR metered injection controlling method according to claim 1 is characterized in that said step 10 may further comprise the steps:
Step 11: utilize sensor to obtain the dynamic pressure P of exhaust
Moving, static pressure P
Quiet, delivery temperature T, and calculate P
Always=P
Moving+ P
Quiet
Step 12:, get the density p=m/V=P of exhaust according to formula: PV=mRgT
Always/ RgT;
Step 13: according to formula: (P+ ρ gz)+(ρ v
2)/2=C gets exhaust v=(2P
Moving/ ρ)
1/2, wherein P+ ρ gz is static pressure P
Quiet, (1/2) * ρ v
2Be dynamic pressure P
Moving, C is stagnation pressure P
Always
Step 14: the v that ρ that obtains according to step 12 and step 13 obtain, the mass flow rate m=vS ρ of exhaust unit time, wherein S is the cross-section area of outlet pipe.
3. free-standing SCR metered injection controlling method according to claim 2 is characterized in that,
Calculate NO in the interior exhaust of unit time in the said step 20
XThe formula of quality is W
(NOx)=mQ * 10
-6/ A, wherein Q is NO
XThe NO that concentration sensor records
XConcentration value, A are the molal weight of exhaust.
4. free-standing SCR metered injection controlling method according to claim 3 is characterized in that the value of said A is 29kg/kmol.
5. free-standing SCR metered injection controlling method according to claim 3 is characterized in that,
In the said step 30, according to NH
3Generative process and NOx catalytic reduction chemical equation calculate the amount of substance X and the W of the urea of wastage in bulk or weight
(NOx)Corresponding relation;
According to (NH
2)
2The CO molal weight is 60kg/mol, draws required (NH
2)
2CO mass M=60X kg;
According to (NH
2)
2The concentration B of the CO aqueous solution and formula W
(NOx)=mQ * 10
-6/ A draws required total (NH
2)
2The mass M of the CO aqueous solution
The aqueous solution
6. free-standing SCR metered injection controlling method according to claim 5 is characterized in that,
In said step 30, set NO and NO in the exhaust
XMol ratio be 9: 1, NO and NO in the exhaust
XAmount of substance be respectively 0.9W
(NOx)Kmol and 0.1W
(NOx)Kmol calculates the amount of substance X=0.5W of the urea of wastage in bulk or weight
(NOx)
According to (NH
2)
2The concentration B of the CO aqueous solution and formula W
(NOx)=mQ * 10
-6/ A draws required total (NH
2)
2The quality of the CO aqueous solution is M
The aqueous solution=60 * mQ * 10
-6/ 2 * 29 * B kg.
7. free-standing SCR metered injection controlling method according to claim 6 is characterized in that the value of said B is 32.5%, draws required total (NH
2)
2The quality of the CO aqueous solution is M
The aqueous solution=3.18 * mQ * 10
-6Kg.
8. a free-standing SCR metered injection control system is characterized in that, comprises absolute pressure transducer, dynamic pressure transducer, exhaust gas temperature sensor and NO
XConcentration sensor, each said sensor is connected with controller on circuit, and the controlling method of said controller is that aforesaid right requires 1 to 7 each described free-standing SCR metered injection controlling method.
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|---|---|---|---|
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|---|---|---|---|
| CN2012100448362A CN102588055A (en) | 2012-02-24 | 2012-02-24 | Independent type SCR (selective catalytic reduction) metered injection control method and system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678239A (en) * | 2012-06-04 | 2012-09-19 | 浙江大学 | Independent SCR (semiconductor control rectifier) system control method and control device based on NOx (nitrogen oxide) sensor |
| CN103590877A (en) * | 2012-08-15 | 2014-02-19 | 福特环球技术公司 | Method and device for monitoring reducing agent solution composition in exhaust gas system of internal combustion engine |
| CN104763498A (en) * | 2015-03-05 | 2015-07-08 | 天纳克（苏州）排放系统有限公司 | Diesel engine nitrogen oxide after-treatment system, control method and application |
| CN105114157A (en) * | 2015-06-29 | 2015-12-02 | 北京理工大学 | Engine transition condition segmentation urea injection method |
| CN105179052A (en) * | 2015-07-13 | 2015-12-23 | 南通亚泰工程技术有限公司 | Marine SCR urea solution spraying system and control method |
| CN106150626A (en) * | 2016-08-30 | 2016-11-23 | 潍柴动力股份有限公司 | A kind of mechanical pump electromotor SCR device, control method and control device |
| CN107703262A (en) * | 2017-10-24 | 2018-02-16 | 华北电力科学研究院有限责任公司 | A kind of method of on-line determination SCR denitration device outlet nitrogen oxides average |
| CN109708895A (en) * | 2018-12-17 | 2019-05-03 | 无锡威孚力达催化净化器有限责任公司 | A kind of calculation method of engine exhaust flow, apparatus and system |
| CN111502807A (en) * | 2020-06-02 | 2020-08-07 | 徐州徐工挖掘机械有限公司 | Engineering machinery exhaust smoke intensity testing method, device and system and storage medium |
| CN112360600A (en) * | 2020-10-30 | 2021-02-12 | 凯龙高科技股份有限公司 | SCR injection control system for internal combustion engine test bench based on air inflow |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102678239A (en) * | 2012-06-04 | 2012-09-19 | 浙江大学 | Independent SCR (semiconductor control rectifier) system control method and control device based on NOx (nitrogen oxide) sensor |
| CN103590877A (en) * | 2012-08-15 | 2014-02-19 | 福特环球技术公司 | Method and device for monitoring reducing agent solution composition in exhaust gas system of internal combustion engine |
| CN103590877B (en) * | 2012-08-15 | 2018-01-16 | 福特环球技术公司 | The method and apparatus for monitoring the reductant solution composition in gas extraction system |
| CN104763498B (en) * | 2015-03-05 | 2017-06-23 | 天纳克（苏州）排放系统有限公司 | Diesel engine nitrogen oxides after-treatment system, control method and its application |
| CN104763498A (en) * | 2015-03-05 | 2015-07-08 | 天纳克（苏州）排放系统有限公司 | Diesel engine nitrogen oxide after-treatment system, control method and application |
| CN105114157A (en) * | 2015-06-29 | 2015-12-02 | 北京理工大学 | Engine transition condition segmentation urea injection method |
| CN105114157B (en) * | 2015-06-29 | 2018-05-22 | 北京理工大学 | A kind of segmentation urea injection method of engine transition operating mode |
| CN105179052A (en) * | 2015-07-13 | 2015-12-23 | 南通亚泰工程技术有限公司 | Marine SCR urea solution spraying system and control method |
| CN106150626A (en) * | 2016-08-30 | 2016-11-23 | 潍柴动力股份有限公司 | A kind of mechanical pump electromotor SCR device, control method and control device |
| CN106150626B (en) * | 2016-08-30 | 2020-09-29 | 潍柴动力股份有限公司 | SCR device, control method and control device for mechanical pump engine |
| CN107703262A (en) * | 2017-10-24 | 2018-02-16 | 华北电力科学研究院有限责任公司 | A kind of method of on-line determination SCR denitration device outlet nitrogen oxides average |
| CN107703262B (en) * | 2017-10-24 | 2020-06-26 | 华北电力科学研究院有限责任公司 | Method for online determination of average value of nitrogen oxides at outlet of SCR denitration device |
| CN109708895A (en) * | 2018-12-17 | 2019-05-03 | 无锡威孚力达催化净化器有限责任公司 | A kind of calculation method of engine exhaust flow, apparatus and system |
| CN111502807A (en) * | 2020-06-02 | 2020-08-07 | 徐州徐工挖掘机械有限公司 | Engineering machinery exhaust smoke intensity testing method, device and system and storage medium |
| CN112360600A (en) * | 2020-10-30 | 2021-02-12 | 凯龙高科技股份有限公司 | SCR injection control system for internal combustion engine test bench based on air inflow |
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Application publication date: 20120718 |