CN109763883A - A kind of detection method of SCR system ammonia leakage, apparatus and system - Google Patents
A kind of detection method of SCR system ammonia leakage, apparatus and system Download PDFInfo
- Publication number
- CN109763883A CN109763883A CN201910110057.XA CN201910110057A CN109763883A CN 109763883 A CN109763883 A CN 109763883A CN 201910110057 A CN201910110057 A CN 201910110057A CN 109763883 A CN109763883 A CN 109763883A
- Authority
- CN
- China
- Prior art keywords
- urea
- reductor
- catalytic reduction
- selective catalytic
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to Diesel Engine After-treatment Technology fields, specifically disclose a kind of detection method of SCR system ammonia leakage, wherein include: the urea injecting quantity for calculating oxidation catalyzer entrance；Urea is sprayed to first choice catalysis reductor；Calculate the urea injecting quantity of the second selective catalytic reduction device entrance；Judge whether the temperature of the second selective catalytic reduction device meets the second range of reaction temperature；Urea is sprayed to the second selective catalytic reduction device；The NOx discharge of the NOx discharge of second selective catalytic reduction device outlet and oxidation catalyzer entrance is done into difference, obtains difference result；Judge whether difference result is more than or equal to the second preset threshold；If so, determining the ammonia leakage of first choice catalysis reductor outlet.The invention also discloses the detection devices and SCR system of a kind of leakage of SCR system ammonia.The detection method of SCR system ammonia leakage provided by the invention can judge whether ammonia is revealed, and have and realize simple and easy to operate advantage.
Description
Technical field
A kind of revealed the present invention relates to Diesel Engine After-treatment Technology field more particularly to SCR system ammonia detection method,
The SCR system of the detection device of SCR system ammonia leakage and the detection device including SCR system ammonia leakage.
Background technique
National six stage diesel engine vent gas post-processing mainstream technology route is DOC(Diesel Oxident Catalyst,
Oxidation catalyzer)+DPF(Diesel Particle Filter, diesel particulate trap)+SCR(Selective
Catalyctic Reduction, selective catalytic reduction), wherein SCR main function is the NO reduced in diesel engine vent gasX,
But since the NOx sensor of mainstream currently on the market all exists to NH3And NOXCross-sensitivity, cannot be distinguished be on earth
NH3Leakage or NOXDischarge is excessive, carries out NO so as to cause exporting in SCRXWhen detection, it may appear that by NH3Leaking erroneous judgement is
NOX, to increase urea injecting quantity, so that urea the more sprays the more more, form vicious circle.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art, a kind of SCR system ammonia is provided and is let out
The SCR of the detection method of dew, the detection device of SCR system ammonia leakage and the detection device including SCR system ammonia leakage
System, to solve the problems of the prior art.
As the first aspect of the invention, a kind of detection method of SCR system ammonia leakage is provided, wherein SCR system
Including diesel engine vent gas after-treatment device, the diesel engine vent gas after-treatment device includes sequentially connected oxidation catalyzer, bavin
Oil particles trap, first choice catalysis reductor and the second selective catalytic reduction device, the SCR system ammonia leakage
Detection method includes:
It is calculated and is aoxidized according to the NOx discharge of engine speed, oil consumption, tail gas exhaust mass flow and oxidation catalyzer entrance
The urea injecting quantity of catalyst converter entrance；
When the temperature of first choice catalysis reductor meets the first range of reaction temperature, the catalysis of Xiang Suoshu first choice is also
Prototype sprays urea；
The NOx emission of reductor outlet is catalyzed according to engine speed, oil consumption, tail gas exhaust mass flow and first choice
Amount calculates the urea injecting quantity of the second selective catalytic reduction device entrance；
When the urea injecting quantity of the second selective catalytic reduction device entrance is greater than the first preset threshold, judge that the second selectivity is urged
Whether the temperature for changing reductor meets the second range of reaction temperature；
If the temperature of the second selective catalytic reduction device meets the second range of reaction temperature, urged to second selectivity
Change reductor and sprays urea；
Obtain the NOx discharge of the second selective catalytic reduction device outlet, and the NOx that the second selective catalytic reduction device is exported
Discharge amount and the NOx discharge of oxidation catalyzer entrance do difference, obtain difference result；
Judge whether the difference result is more than or equal to the second preset threshold；
If the difference result is more than or equal to second preset threshold, the outlet of first choice catalysis reductor is determined
Ammonia leakage.
Preferably, the detection method of the SCR system ammonia leakage further include:
If the difference result is less than second preset threshold, the NOx row of first choice catalysis reductor outlet is determined
It is high-volume excessive；
The NOx emission exported according to engine speed, oil consumption, tail gas exhaust mass flow and the second selective catalytic reduction device
Amount calculates the urea injecting quantity of the second selective catalytic reduction device outlet；
It is calculated according to the urea injecting quantity that the urea injecting quantity of oxidation catalyzer entrance and the second selective catalytic reduction device export
Total urea injecting quantity；
Urea is sprayed to first choice catalysis reductor according to total urea injecting quantity.
Preferably, the detection method of the SCR system ammonia leakage is included in described when first choice is catalyzed reductor
Temperature when meeting the first range of reaction temperature, carried out before Xiang Suoshu first choice catalysis reductor injection urea step:
Judge the temperature of first choice catalysis reductor whether in the first range of reaction temperature；
If the temperature of the first choice catalysis reductor is in the first range of reaction temperature, the first choice catalysis
The temperature of reductor meets the first range of reaction temperature.
Preferably, first range of reaction temperature includes greater than the outlet temperature of first choice catalysis reductor
And it is less than the inlet temperature of first choice catalysis reductor.
Preferably, the detection method of the SCR system ammonia leakage includes:
If the temperature of the second selective catalytic reduction device is unsatisfactory for the second range of reaction temperature, to second selectivity
Catalysis reductor is heated.
Preferably, second range of reaction temperature includes the outlet temperature greater than the second selective catalytic reduction device
And it is less than the inlet temperature of the second selective catalytic reduction device.
As the second aspect of the invention, a kind of detection device of SCR system ammonia leakage is provided, wherein SCR system
Including diesel engine vent gas after-treatment device, the diesel engine vent gas after-treatment device includes sequentially connected oxidation catalyzer, bavin
Oil particles trap, first choice catalysis reductor and the second selective catalytic reduction device, the SCR system ammonia leakage
Detection device includes:
First urea injecting quantity computing module, the first urea injecting quantity computing module are used for according to engine speed, oil consumption
The NOx discharge of amount, tail gas exhaust mass flow and oxidation catalyzer entrance calculates the urea injecting quantity of oxidation catalyzer entrance；
First injection control module, first injection control module are used to meet when the temperature of first choice catalysis reductor
When the first range of reaction temperature, Xiang Suoshu first choice is catalyzed reductor and sprays urea；
Second urea injecting quantity computing module, the second urea injecting quantity computing module are used for according to engine speed, oil consumption
The NOx discharge of amount, tail gas exhaust mass flow and the outlet of first choice catalysis reductor calculates the second selective catalysis also
The urea injecting quantity of prototype entrance；
Temperature judgment module, the temperature judgment module are used for when the urea injecting quantity of the second selective catalytic reduction device entrance is big
When the first preset threshold, judge whether the temperature of the second selective catalytic reduction device meets the second range of reaction temperature；
Second injection control module, if second injection control module is used for the temperature of the second selective catalytic reduction device
Meet the second range of reaction temperature, then sprays urea to the second selective catalytic reduction device；
Difference calculating module, the difference calculating module are used to obtain the NOx discharge of the second selective catalytic reduction device outlet,
And the NOx discharge of the NOx discharge of the second selective catalytic reduction device outlet and oxidation catalyzer entrance is done into difference, it obtains
Difference result；
Difference judgment module, the difference judgment module is for judging it is default whether the difference result is more than or equal to second
Threshold value；
Ammonia reveals determination module, if ammonia leakage determination module is more than or equal to described for the difference result
Two preset thresholds then determine the ammonia leakage of first choice catalysis reductor outlet.
Preferably, the detection device of the SCR system ammonia leakage further include:
The excessive determination module of NOx discharge, if the excessive determination module of the NOx discharge is for the difference result less than described
Second preset threshold then determines that the NOx discharge of first choice catalysis reductor outlet is excessive；
Third urea injecting quantity computing module, the third urea injecting quantity computing module are used for according to engine speed, oil consumption
The NOx discharge of amount, tail gas exhaust mass flow and the outlet of the second selective catalytic reduction device calculates the second selective catalysis also
The urea injecting quantity of prototype outlet；
Total urea injecting quantity computing module, total urea injecting quantity computing module are used for the urea according to oxidation catalyzer entrance
The amount of injection and the urea injecting quantity of the second selective catalytic reduction device outlet calculate total urea injecting quantity；
Urea jet module, the urea jet module according to total urea injecting quantity to the first choice for being catalyzed
Reductor sprays urea.
As the third aspect of the invention, a kind of SCR system is provided, wherein the SCR system includes diesel engine vent gas
The detection device of after-treatment device, control device and the leakage of previously described SCR system ammonia, the diesel engine after treatment device dress
It sets and is urged including sequentially connected oxidation catalyzer, diesel particulate trap, first choice catalysis reductor and the second selectivity
Change reductor, the oxidation catalyzer, diesel particulate trap, first choice catalysis reductor and the second selective catalysis are also
Detection device of the prototype with SCR system ammonia leakage communicates to connect, the detection device of SCR system ammonia leakage with
The control device communication connection, the detection device of the SCR system ammonia leakage is under the control of the control device
Whether the ammonia for detecting the first choice catalysis reductor outlet is revealed.
Preferably, the SCR system further includes the first NOx sensor, the first urea nozzle, the second NOx sensor, second
Urea nozzle, third NOx sensor, the first temperature sensor, second temperature sensor, third temperature sensor and SCR heating
Module,
The entrance of the oxidation catalyzer is arranged in first NOx sensor, for detecting the oxidation catalyzer entrance
NOx discharge；
The outlet of the first choice catalysis reductor is arranged in second NOx sensor, for detecting first choosing
Selecting property is catalyzed the NOx discharge of reductor outlet；
The outlet of the second selective catalytic reduction device is arranged in the third NOx sensor, for detecting second choosing
Selecting property is catalyzed the NOx discharge of reductor outlet；
The entrance of the first choice catalysis reductor is arranged in first urea nozzle, is used for the first choice
It is catalyzed reductor and sprays urea；
The entrance of the second selective catalytic reduction device is arranged in second urea nozzle, for selective to described second
It is catalyzed reductor and sprays urea；
The entrance of the first choice catalysis reductor is arranged in first temperature sensor, for detecting first choosing
The inlet temperature of selecting property catalysis reductor；
The second temperature sensor setting is catalyzed reductor and second selective catalytic reduction in the first choice
Between device, for detect first choice catalysis reductor outlet temperature and the second selective catalytic reduction device
Inlet temperature；
The outlet of the second selective catalytic reduction device is arranged in the third temperature sensor, for detecting second choosing
The outlet temperature of selecting property catalysis reductor；
The entrance of the second selective catalytic reduction device is arranged in the SCR heating module, for selective for described second
Catalysis reductor is heated.
The detection method of SCR system ammonia leakage provided by the invention, by existing diesel tail-gas after treatment apparatus
On the basis of increase a selective catalytic reduction device, then by spraying urea to the selective catalytic reduction device that newly increases
Amount, by the difference for judging the NOx discharge of the second selective catalytic reduction device outlet and the NOx discharge of oxidation catalyzer entrance
The size of value result and the second preset threshold judges whether ammonia is revealed, the detection method energy of this SCR system ammonia leakage
Enough judge whether ammonia is revealed after first choice is catalyzed reductor, have realize it is simple and easy to operate excellent
Gesture.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart of the detection method of SCR system ammonia provided by the invention leakage.
Fig. 2 is the structural schematic diagram of SCR system provided by the invention.
Fig. 3 is the specific embodiment flow chart of the detection method of SCR system ammonia provided by the invention leakage.
Fig. 4 is the structural block diagram of the detection device of SCR system ammonia provided by the invention leakage.
Fig. 5 is the structural block diagram of SCR system provided by the invention.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
As the first aspect of the invention, provide a kind of detection method of SCR system ammonia leakage, wherein such as Fig. 1 and
Shown in Fig. 2, SCR system includes diesel engine vent gas after-treatment device, and the diesel engine vent gas after-treatment device includes being sequentially connected
Oxidation catalyzer DOC, diesel particulate trap DPF, first choice catalysis reductor SCR1 and the second selective catalysis also
Prototype SCR2, the detection method of the SCR system ammonia leakage include:
S110, according to engine speed, oil consumption, the NOx discharge of tail gas exhaust mass flow and oxidation catalyzer DOC inlet
Calculate the urea injecting quantity of oxidation catalyzer DOC inlet；
S120, when first choice catalysis reductor SCR1 temperature meet the first range of reaction temperature when, Xiang Suoshu first select
Selecting property is catalyzed reductor SCR1 and sprays urea；
S130, the outlet reductor SCR1 is catalyzed according to engine speed, oil consumption, tail gas exhaust mass flow and first choice
NOx discharge calculate the second selective catalytic reduction device SCR2 entrance urea injecting quantity；
S140, when the urea injecting quantity of the second selective catalytic reduction device SCR2 entrance is greater than the first preset threshold, judge the
Whether the temperature of two selective catalytic reduction device SCR2 meets the second range of reaction temperature；
If the temperature of S150, the second selective catalytic reduction device SCR2 meet the second range of reaction temperature, to described the
Two selective catalytic reduction device SCR2 spray urea；
S160, the NOx discharge for obtaining the outlet the second selective catalytic reduction device SCR2, and by the second selective catalytic reduction device
The NOx discharge of the outlet SCR2 and the NOx discharge of oxidation catalyzer DOC inlet do difference, obtain difference result；
S170, judge whether the difference result is more than or equal to the second preset threshold；
If S180, the difference result are more than or equal to second preset threshold, first choice catalysis reduction is determined
The ammonia leakage of the outlet device SCR1.
The detection method of SCR system ammonia leakage provided by the invention, by existing diesel tail-gas after treatment apparatus
On the basis of increase a selective catalytic reduction device, then by spraying urea to the selective catalytic reduction device that newly increases
Amount, by the difference for judging the NOx discharge of the second selective catalytic reduction device outlet and the NOx discharge of oxidation catalyzer entrance
The size of value result and the second preset threshold judges whether ammonia is revealed, the detection method energy of this SCR system ammonia leakage
Enough judge whether ammonia is revealed after first choice is catalyzed reductor, have realize it is simple and easy to operate excellent
Gesture.
It should be noted that first preset threshold and second preset threshold are all to be demarcated in advance
, it can be demarcated according to the different SCR mean temperature of engine and exhaust quality.For example, working as engine exhaust quality stream
Amount is 300kg/h, and when SCR1 mean temperature is 250 DEG C, the first preset threshold can be demarcated as 20PPM, when engine exhaust matter
Amount flow is 400 kg/h, and when SCR1 mean temperature is 350 DEG C, the first preset threshold can be demarcated as 15PPM.It should be understood that
It is that first preset threshold may be considered a map, according to different exhaust mass flows and different SCR mean temperatures
A corresponding value is searched, and the size of corresponding value can be set according to requiring, that is, if it is considered under entire discharge cycle
Come, NOx discharge is normal within 20 PPM, so that it may judge how whole map demarcates according to this condition.Similarly,
Second preset threshold is same, corresponding value is demarcated according to the mean temperature of different exhaust mass flows and SCR2, the value is again
It is compared with two NOx sensor differences.
Specifically, the detection method of the SCR system ammonia leakage further include:
If the difference result is less than second preset threshold, the outlet first choice catalysis reductor SCR1 is determined
NOx discharge is excessive；
The NOx exported according to engine speed, oil consumption, tail gas exhaust mass flow and the second selective catalytic reduction device SCR2
The urea injecting quantity of the outlet Emission amount calculation the second selective catalytic reduction device SCR2；
The urea injection exported according to the urea injecting quantity of oxidation catalyzer DOC inlet and the second selective catalytic reduction device SCR2
Amount calculates total urea injecting quantity；
Urea is sprayed to first choice catalysis reductor SCR1 according to total urea injecting quantity.
Specifically, the detection method of the SCR system ammonia leakage is included in described when first choice is catalyzed reductor
When the temperature of SCR1 meets the first range of reaction temperature, before Xiang Suoshu first choice is catalyzed reductor SCR1 injection urea step
It carries out:
Judge the temperature of first choice catalysis reductor SCR1 whether in the first range of reaction temperature；
If the temperature of the first choice catalysis reductor SCR1 is in the first range of reaction temperature, the first choice
The temperature for being catalyzed reductor meets the first range of reaction temperature.
Preferably, first range of reaction temperature includes greater than the outlet temperature of first choice catalysis reductor
And it is less than the inlet temperature of first choice catalysis reductor SCR1.
Specifically, the detection method of the SCR system ammonia leakage includes:
If the temperature of the second selective catalytic reduction device SCR2 is unsatisfactory for the second range of reaction temperature, to second choosing
Selecting property catalysis reductor SCR2 is heated.
Preferably, second range of reaction temperature includes the outlet greater than the second selective catalytic reduction device SCR2
Temperature and the inlet temperature for being less than the second selective catalytic reduction device SCR2.
It is described in detail below with reference to the detection method that Fig. 3 reveals SCR system ammonia provided by the invention.
The structure of SCR system is as shown in Fig. 2, after engine starts running, DCU(Drive Control Unit is driven
Control unit) oxygen that is detected first according to engine speed, oil consumption, exhaust mass flow and the first NOx sensor 1
The NOx discharge for changing catalyst converter entrance calculates the urea injecting quantity of oxidation catalyzer entrance, restores when first choice is catalyzed
After the temperature of SCR1 meets the average value requirement of the first temperature sensor 7 and second temperature sensor 8, pass through the first correction module
It is applied to the first urea nozzle 2 and carries out urea injection.The urea of injection is detected after SCR1 by the second NOx sensor 3, by
In at present, NOx and NH3 is cannot be distinguished in NOx sensor characteristic on the market, so having by the gas of 3 position of the second NOx sensor
There may be two kinds of situations, cross one is the first urea nozzle 2 and spray caused NH3 leakage, another situation is that the first urea sprays
The discharge of NOx caused by mouth 2 sprays less, as long as the second NOx sensor 3 detects that value is excessive, is greater than the operating condition regardless of situation
Under the first preset threshold, then enter delayed injection module, if the mean temperature of the second selective catalytic reduction device SCR2 at this time
(i.e. second temperature sensor 8 and the average value with third temperature sensor 9) is less than urea injection limitation, then SCR heating module 5
Starting, starts to start to heat to SCR2；If SCR2 mean temperature meets urea eject request, without being carried out to SCR2
Heating.After completing heating, the second urea nozzle 4 starts to spray a small amount of urea, while delayed injection module passes to signal
Third NOx sensor 6, then the first NOx sensor 1 and third NOx sensor 6 do difference, difference result and the second preset threshold
Compare, if the difference result is more than or equal to the second preset threshold, illustrates to include at this time a large amount of NOx, warp by the gas of SCR2
It is reacted after SCR2 with NH3, NOx value reduces；On the contrary, if the difference result less than the second preset threshold, illustrates to pass through at this time
The gas of SCR2 is NH3, along with the second urea nozzle 4 jetted a small amount of NH3 again, so the NH3 of the outlet SCR2 leaks meeting
It further increases.
Detect that SCR2 exit gas is to feed back information to DCU after NOx or NH3 is leaked, DCU passes through control first
Urea injecting quantity computing module carries out crossing for urea and sprays or spray less, so that SCR2 exit gas both leaks or do not have without NH3
NOx discharge, reaches the balance of a reaction.
As the second aspect of the invention, a kind of detection device of SCR system ammonia leakage is provided, wherein SCR system
Including diesel engine vent gas after-treatment device, the diesel engine vent gas after-treatment device includes sequentially connected oxidation catalyzer, bavin
Oil particles trap, first choice catalysis reductor and the second selective catalytic reduction device, as shown in figure 4, the SCR system
Ammonia leakage detection device 100 include:
First urea injecting quantity computing module 110, the first urea injecting quantity computing module 110 are used to be turned according to engine
Speed, oil consumption, the NOx discharge of tail gas exhaust mass flow and oxidation catalyzer entrance calculate the urea of oxidation catalyzer entrance
The amount of injection；
First injection control module 120, first injection control module 120 are used for the temperature when first choice catalysis reductor
When degree meets the first range of reaction temperature, Xiang Suoshu first choice is catalyzed reductor and sprays urea；
Second urea injecting quantity computing module 130, the second urea injecting quantity computing module 130 are used to be turned according to engine
Speed, oil consumption, tail gas exhaust mass flow and the NOx discharge of first choice catalysis reductor outlet calculate the second selectivity
It is catalyzed the urea injecting quantity of reductor entrance；
Temperature judgment module 140, the temperature judgment module 140 are used to spray when the urea of the second selective catalytic reduction device entrance
When the amount of penetrating is greater than the first preset threshold, judge whether the temperature of the second selective catalytic reduction device meets the second reaction temperature model
It encloses；
Second injection control module 150, if second injection control module 150 is used for the second selective catalytic reduction device
Temperature meet the second range of reaction temperature, then to the second selective catalytic reduction device spray urea；
Difference calculating module 160, the difference calculating module 160 are used to obtain the NOx of the second selective catalytic reduction device outlet
Discharge amount, and the NOx discharge of the NOx discharge of the second selective catalytic reduction device outlet and oxidation catalyzer entrance is made the difference
Value, obtains difference result；
Difference judgment module 170, the difference judgment module 170 is for judging whether the difference result is more than or equal to the
Two preset thresholds；
Ammonia reveals determination module 180, if ammonia leakage determination module 180 is more than or equal to for the difference result
Second preset threshold then determines the ammonia leakage of first choice catalysis reductor outlet.
The detection device of SCR system ammonia leakage provided by the invention, by existing diesel tail-gas after treatment apparatus
On the basis of increase a selective catalytic reduction device, then by spraying urea to the selective catalytic reduction device that newly increases
Amount, by the difference for judging the NOx discharge of the second selective catalytic reduction device outlet and the NOx discharge of oxidation catalyzer entrance
The size of value result and the second preset threshold judges whether ammonia is revealed, the detection device energy of this SCR system ammonia leakage
Enough judge whether ammonia is revealed after first choice is catalyzed reductor, have realize it is simple and easy to operate excellent
Gesture.
Specifically, the detection device of the SCR system ammonia leakage further include:
The excessive determination module of NOx discharge, if the excessive determination module of the NOx discharge is for the difference result less than described
Second preset threshold then determines that the NOx discharge of first choice catalysis reductor outlet is excessive；
Third urea injecting quantity computing module, the third urea injecting quantity computing module are used for according to engine speed, oil consumption
The NOx discharge of amount, tail gas exhaust mass flow and the outlet of the second selective catalytic reduction device calculates the second selective catalysis also
The urea injecting quantity of prototype outlet；
Total urea injecting quantity computing module, total urea injecting quantity computing module are used for the urea according to oxidation catalyzer entrance
The amount of injection and the urea injecting quantity of the second selective catalytic reduction device outlet calculate total urea injecting quantity；
Urea jet module, the urea jet module according to total urea injecting quantity to the first choice for being catalyzed
Reductor sprays urea.
It should be noted that first injection control module 120 is equivalent to the first correction module in Fig. 3, the second spray
Penetrate the second correction module that control module 150 is equivalent in Fig. 3.
The working principle of detection device about SCR system ammonia provided by the invention leakage is referred to SCR above
The description of the detection method of system ammonia leakage, details are not described herein again.
As the third aspect of the invention, a kind of SCR system is provided, wherein as shown in Figure 2 and Figure 5, the SCR system
System 10 includes the detection of diesel engine vent gas after-treatment device 200, control device 300 and the leakage of previously described SCR system ammonia
Device 100, the SCR system oil machine preprocessor device 200 are caught including sequentially connected oxidation catalyzer DOC, diesel particulate
Storage DPF, first choice catalysis reductor SCR1 and the second selective catalytic reduction device SCR2, the oxidation catalyzer DOC,
Diesel particulate trap DPF, first choice catalysis reductor SCR1 and the second selective catalytic reduction device SCR2 with it is described
The detection device 100 of SCR system ammonia leakage communicates to connect, the detection device 100 and the control of the SCR system ammonia leakage
300 connection of device communication processed, the detection device 100 of the SCR system ammonia leakage are used for the control in the control device 300
Whether the ammonia of the lower detection outlet first choice catalysis reductor SCR1 is revealed.
SCR system provided by the invention, by increasing a choosing on the basis of existing diesel tail-gas after treatment apparatus
Selecting property is catalyzed reductor, then by spraying urea amount to the selective catalytic reduction device newly increased, by judging the second selection
Property catalysis reductor outlet NOx discharge and oxidation catalyzer entrance NOx discharge difference result and the second default threshold
The size of value judges whether ammonia is revealed, and this SCR system can judge the ammonia after first choice is catalyzed reductor
Whether gas is revealed, and has and realizes simple and easy to operate advantage.
Specifically, as shown in Fig. 2, the SCR system further includes the first NOx sensor 1, the first urea nozzle 2, second
NOx sensor 3, the second urea nozzle 4, third NOx sensor 6, the first temperature sensor 7, second temperature sensor 8, third
Temperature sensor 9 and SCR heating module 5,
The entrance of the oxidation catalyzer DOC is arranged in first NOx sensor 1, for detecting the oxidation catalyzer DOC
The NOx discharge of entrance；
The outlet of first choice catalysis reductor SCR1 is arranged in second NOx sensor 3, for detecting described the
The NOx discharge of the outlet one selective catalytic reduction device SCR1；
The outlet of the second selective catalytic reduction device SCR2 is arranged in the third NOx sensor 6, for detecting described
The NOx discharge of the outlet two selective catalytic reduction device SCR2；
The entrance of the first choice catalysis reductor SCR1 is arranged in first urea nozzle 2, is used for described first
Selective catalytic reduction device SCR1 sprays urea；
The entrance of the second selective catalytic reduction device SCR2 is arranged in second urea nozzle 4, is used for described second
Selective catalytic reduction device SCR2 sprays urea；
The entrance of the first choice catalysis reductor SCR1 is arranged in first temperature sensor 7, described for detecting
The inlet temperature of first choice catalysis reductor SCR1；
The setting of second temperature sensor 8 is catalyzed reductor SCR1 and second selective catalysis in the first choice
Between reductor SCR2, for detecting the outlet temperature and second selection of the first choice catalysis reductor SCR1
Property catalysis reductor SCR2 inlet temperature；
The outlet of the second selective catalytic reduction device SCR2 is arranged in the third temperature sensor 9, described for detecting
The outlet temperature of second selective catalytic reduction device SCR2；
The entrance of the second selective catalytic reduction device SCR2 is arranged in the SCR heating module 5, for selecting for described second
Selecting property catalysis reductor SCR2 is heated.
Preferably, the control device includes DCU.
It should be noted that previously described first range of reaction temperature is preferably included greater than first temperature sensing
Device 7 and the average value of second temperature sensor 8 and the inlet temperature for being less than first choice catalysis reductor SCR1, due to
First temperature sensor 7 is used to detect the inlet temperature of the first choice catalysis reductor SCR1, and therefore, described first is anti-
It answers temperature range to preferably include the average value greater than first temperature sensor 7 and second temperature sensor 8 and is less than institute
State the temperature value of the first temperature sensor 7.
Previously described second range of reaction temperature is preferably included greater than the second temperature sensor 8 and third temperature
The average value of sensor 9 and the inlet temperature for being less than the second selective catalytic reduction device SCR2, since second temperature senses
Device 8 is used to detect the inlet temperature of the second selective catalytic reduction device SCR2, and therefore, second range of reaction temperature is excellent
Selection of land includes the average value greater than the second temperature sensor 8 and third temperature sensor 9 and is less than second temperature sensor 8
Temperature value.
Specific work process about SCR system provided by the invention is referred to the leakage of SCR system ammonia above
The description of detection method, details are not described herein again.
Therefore, detection method, detection device and the SCR system of SCR system ammonia leakage provided by the invention, can be effective
The gas componant for distinguishing the outlet port SCR2 is NOx or NH3, and is fed back to result, so that urea nozzle 1 is accurate
Carry out urea injection；Two urea nozzles are provided, the first urea nozzle and the front end SCR2 of the front end SCR1 are arranged in
Second urea nozzle, wherein the first urea nozzle is main jet, and a certain amount of urea is sprayed in engine operation process and is come instead
NOx in should being vented, the second urea nozzle are detection nozzle, spray a small amount of urea, the gas for detecting the exit SCR2 is
NOx or NH3 leakage；It is respectively SCR1 and SCR2 that the present invention, which arranges two-stage SCR, and wherein the front end SCR2 has electric heating function
Can, when SCR2 mean temperature is lower than temperature limit, heating module starting adds when SCR2 mean temperature is higher than temperature limit
Thermal modules are closed.Therefore, the present invention has on the basis of not changing the self character of NOx sensor, by control logic operation,
Effectively distinguishing SCR exit gas is NH3 leakage or NOx emission；Without larger change in terms of post-processing allocation plan, so
It is easier in production and application aspect.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of detection method of SCR system ammonia leakage, which is characterized in that SCR system includes diesel engine vent gas post-processing dress
It sets, the diesel engine vent gas after-treatment device includes sequentially connected oxidation catalyzer, diesel particulate trap, first choice
It is catalyzed reductor and the second selective catalytic reduction device, the detection method of the SCR system ammonia leakage includes:
It is calculated and is aoxidized according to the NOx discharge of engine speed, oil consumption, tail gas exhaust mass flow and oxidation catalyzer entrance
The urea injecting quantity of catalyst converter entrance；
When the temperature of first choice catalysis reductor meets the first range of reaction temperature, the catalysis of Xiang Suoshu first choice is also
Prototype sprays urea；
The NOx emission of reductor outlet is catalyzed according to engine speed, oil consumption, tail gas exhaust mass flow and first choice
Amount calculates the urea injecting quantity of the second selective catalytic reduction device entrance；
When the urea injecting quantity of the second selective catalytic reduction device entrance is greater than the first preset threshold, judge that the second selectivity is urged
Whether the temperature for changing reductor meets the second range of reaction temperature；
If the temperature of the second selective catalytic reduction device meets the second range of reaction temperature, urged to second selectivity
Change reductor and sprays urea；
Obtain the NOx discharge of the second selective catalytic reduction device outlet, and the NOx that the second selective catalytic reduction device is exported
Discharge amount and the NOx discharge of oxidation catalyzer entrance do difference, obtain difference result；
Judge whether the difference result is more than or equal to the second preset threshold；
If the difference result is more than or equal to second preset threshold, the outlet of first choice catalysis reductor is determined
Ammonia leakage.
2. the detection method of SCR system ammonia leakage according to claim 1, which is characterized in that the SCR system ammonia
The detection method of leakage further include:
If the difference result is less than second preset threshold, the NOx row of first choice catalysis reductor outlet is determined
It is high-volume excessive；
The NOx emission exported according to engine speed, oil consumption, tail gas exhaust mass flow and the second selective catalytic reduction device
Amount calculates the urea injecting quantity of the second selective catalytic reduction device outlet；
It is calculated according to the urea injecting quantity that the urea injecting quantity of oxidation catalyzer entrance and the second selective catalytic reduction device export
Total urea injecting quantity；
Urea is sprayed to first choice catalysis reductor according to total urea injecting quantity.
3. the detection method of SCR system ammonia leakage according to claim 1, which is characterized in that the SCR system ammonia
The detection method of leakage include it is described when first choice catalysis reductor temperature meet the first range of reaction temperature when, to
It is carried out before the first choice catalysis reductor injection urea step:
Judge the temperature of first choice catalysis reductor whether in the first range of reaction temperature；
If the temperature of the first choice catalysis reductor is in the first range of reaction temperature, the first choice catalysis
The temperature of reductor meets the first range of reaction temperature.
4. the detection method of SCR system ammonia leakage according to claim 1 or 3, which is characterized in that first reaction
Temperature range includes the outlet temperature greater than first choice catalysis reductor and is less than first choice catalysis also
The inlet temperature of prototype.
5. the detection method of SCR system ammonia leakage according to claim 1, which is characterized in that the SCR system ammonia
The detection method of leakage includes:
If the temperature of the second selective catalytic reduction device is unsatisfactory for the second range of reaction temperature, to second selectivity
Catalysis reductor is heated.
6. the detection method of SCR system ammonia leakage according to claim 1 or 5, which is characterized in that second reaction
Temperature range includes the outlet temperature greater than the second selective catalytic reduction device and is less than second selective catalysis also
The inlet temperature of prototype.
7. a kind of detection device of SCR system ammonia leakage, which is characterized in that SCR system includes diesel engine vent gas post-processing dress
It sets, the diesel engine vent gas after-treatment device includes sequentially connected oxidation catalyzer, diesel particulate trap, first choice
It is catalyzed reductor and the second selective catalytic reduction device, the detection device of the SCR system ammonia leakage includes:
First urea injecting quantity computing module, the first urea injecting quantity computing module are used for according to engine speed, oil consumption
The NOx discharge of amount, tail gas exhaust mass flow and oxidation catalyzer entrance calculates the urea injecting quantity of oxidation catalyzer entrance；
First injection control module, first injection control module are used to meet when the temperature of first choice catalysis reductor
When the first range of reaction temperature, Xiang Suoshu first choice is catalyzed reductor and sprays urea；
Second urea injecting quantity computing module, the second urea injecting quantity computing module are used for according to engine speed, oil consumption
The NOx discharge of amount, tail gas exhaust mass flow and the outlet of first choice catalysis reductor calculates the second selective catalysis also
The urea injecting quantity of prototype entrance；
Temperature judgment module, the temperature judgment module are used for when the urea injecting quantity of the second selective catalytic reduction device entrance is big
When the first preset threshold, judge whether the temperature of the second selective catalytic reduction device meets the second range of reaction temperature；
Second injection control module, if second injection control module is used for the temperature of the second selective catalytic reduction device
Meet the second range of reaction temperature, then sprays urea to the second selective catalytic reduction device；
Difference calculating module, the difference calculating module are used to obtain the NOx discharge of the second selective catalytic reduction device outlet,
And the NOx discharge of the NOx discharge of the second selective catalytic reduction device outlet and oxidation catalyzer entrance is done into difference, it obtains
Difference result；
Difference judgment module, the difference judgment module is for judging it is default whether the difference result is more than or equal to second
Threshold value；
Ammonia reveals determination module, if ammonia leakage determination module is more than or equal to described for the difference result
Two preset thresholds then determine the ammonia leakage of first choice catalysis reductor outlet.
8. the detection device of SCR system ammonia leakage according to claim 7, which is characterized in that the SCR system ammonia
The detection device of leakage further include:
The excessive determination module of NOx discharge, if the excessive determination module of the NOx discharge is for the difference result less than described
Second preset threshold then determines that the NOx discharge of first choice catalysis reductor outlet is excessive；
Third urea injecting quantity computing module, the third urea injecting quantity computing module are used for according to engine speed, oil consumption
The NOx discharge of amount, tail gas exhaust mass flow and the outlet of the second selective catalytic reduction device calculates the second selective catalysis also
The urea injecting quantity of prototype outlet；
Total urea injecting quantity computing module, total urea injecting quantity computing module are used for the urea according to oxidation catalyzer entrance
The amount of injection and the urea injecting quantity of the second selective catalytic reduction device outlet calculate total urea injecting quantity；
Urea jet module, the urea jet module according to total urea injecting quantity to the first choice for being catalyzed
Reductor sprays urea.
9. a kind of SCR system, which is characterized in that the SCR system includes diesel engine vent gas after-treatment device, control device and power
Benefit require 7 or 8 described in SCR system ammonia leakage detection device, the diesel engine after treatment device device include be sequentially connected
Oxidation catalyzer, diesel particulate trap, first choice catalysis reductor and the second selective catalytic reduction device, the oxygen
Change catalyst converter, diesel particulate trap, first choice catalysis reductor and the second selective catalytic reduction device with the SCR
The detection device communication connection of system ammonia leakage, the detection device of the SCR system ammonia leakage and the control device are logical
Letter connection, the detection device of the SCR system ammonia leakage for detecting first choosing under the control of the control device
Whether the ammonia of selecting property catalysis reductor outlet is revealed.
10. SCR system according to claim 9, which is characterized in that the SCR system further include the first NOx sensor,
First urea nozzle, the second NOx sensor, the second urea nozzle, third NOx sensor, the first temperature sensor, second temperature
Sensor, third temperature sensor and SCR heating module,
The entrance of the oxidation catalyzer is arranged in first NOx sensor, for detecting the oxidation catalyzer entrance
NOx discharge；
The outlet of the first choice catalysis reductor is arranged in second NOx sensor, for detecting first choosing
Selecting property is catalyzed the NOx discharge of reductor outlet；
The outlet of the second selective catalytic reduction device is arranged in the third NOx sensor, for detecting second choosing
Selecting property is catalyzed the NOx discharge of reductor outlet；
The entrance of the first choice catalysis reductor is arranged in first urea nozzle, is used for the first choice
It is catalyzed reductor and sprays urea；
The entrance of the second selective catalytic reduction device is arranged in second urea nozzle, for selective to described second
It is catalyzed reductor and sprays urea；
The entrance of the first choice catalysis reductor is arranged in first temperature sensor, for detecting first choosing
The inlet temperature of selecting property catalysis reductor；
The second temperature sensor setting is catalyzed reductor and second selective catalytic reduction in the first choice
Between device, for detect first choice catalysis reductor outlet temperature and the second selective catalytic reduction device
Inlet temperature；
The outlet of the second selective catalytic reduction device is arranged in the third temperature sensor, for detecting second choosing
The outlet temperature of selecting property catalysis reductor；
The entrance of the second selective catalytic reduction device is arranged in the SCR heating module, for selective for described second
Catalysis reductor is heated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910110057.XA CN109763883B (en) | 2019-02-11 | 2019-02-11 | Method, device and system for detecting ammonia gas leakage of SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910110057.XA CN109763883B (en) | 2019-02-11 | 2019-02-11 | Method, device and system for detecting ammonia gas leakage of SCR system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109763883A true CN109763883A (en) | 2019-05-17 |
| CN109763883B CN109763883B (en) | 2021-03-12 |
Family
ID=66454752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910110057.XA Active CN109763883B (en) | 2019-02-11 | 2019-02-11 | Method, device and system for detecting ammonia gas leakage of SCR system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109763883B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110206621A (en) * | 2019-05-29 | 2019-09-06 | 一汽解放汽车有限公司 | A kind of the High-efficiency diesel engine after-treatment device and its control method of wide temperature window |
| CN110778385A (en) * | 2019-09-25 | 2020-02-11 | 潍柴动力股份有限公司 | Method and device for detecting leakage of urea injection system on line |
| CN112523842A (en) * | 2020-10-29 | 2021-03-19 | 广西玉柴机器股份有限公司 | Temperature protection method for selective catalytic reduction system of internal combustion engine and related device |
| CN112780386A (en) * | 2021-01-29 | 2021-05-11 | 广西玉柴机器股份有限公司 | Aftertreatment two-stage urea injection system |
| CN113701959A (en) * | 2020-05-21 | 2021-11-26 | 北京福田康明斯发动机有限公司 | Vehicle exhaust pipeline air leakage detection method |
| CN114483268A (en) * | 2022-02-25 | 2022-05-13 | 湖南道依茨动力有限公司 | Ammonia leakage identification method and device, electronic equipment, engineering equipment and medium |
| CN114592958A (en) * | 2021-02-09 | 2022-06-07 | 长城汽车股份有限公司 | Fuel engine tail gas aftertreatment system and method |
| CN114961956A (en) * | 2022-07-06 | 2022-08-30 | 潍柴动力股份有限公司 | Method and device for diagnosing conversion efficiency of selective catalytic reduction |
| CN115045738A (en) * | 2022-05-09 | 2022-09-13 | 潍柴动力股份有限公司 | Control method and device of urea injection system, processor and urea injection system |
| CN115095411A (en) * | 2022-07-06 | 2022-09-23 | 潍柴动力股份有限公司 | Detection method and device for removal of selective catalytic reduction carrier |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06343877A (en) * | 1993-03-26 | 1994-12-20 | Siemens Ag | Catalyst for decreasing nitrogen oxide in exhaust gas of internal combustion engine |
| CN101713317A (en) * | 2009-11-12 | 2010-05-26 | 无锡市凯龙汽车设备制造有限公司 | Method for controlling addition amount of diesel engine tail gas selective catalytic reducing agent |
| US20110072798A1 (en) * | 2009-09-28 | 2011-03-31 | Herman Andrew D | NOx CONTROL REQUEST FOR NH3 STORAGE CONTROL |
| CN102330592A (en) * | 2011-10-09 | 2012-01-25 | 潍柴动力股份有限公司 | Exhaust emission aftertreatment equipment and method for diesel engine |
| CN102869431A (en) * | 2010-06-30 | 2013-01-09 | 恩亿凯嘉股份有限公司 | Flue gas-cleaning device and flue gas-cleaning method that use selective catalytic reduction catalyst |
| CN102877923A (en) * | 2011-07-15 | 2013-01-16 | 福特环球技术公司 | System and method for processing nh3 slippage of a selective catalyst reduction system |
| CN105604653A (en) * | 2016-03-18 | 2016-05-25 | 安徽华菱汽车有限公司 | Urea jet control method and device and SCR system |
| CN106062331A (en) * | 2014-02-28 | 2016-10-26 | 斯堪尼亚商用车有限公司 | Exhaust treatment system and method for treatment of an exhaust stream |
| EP3139013A1 (en) * | 2015-09-01 | 2017-03-08 | Bayerische Motoren Werke Aktiengesellschaft | Method for operating an exhaust gas purification device |
| WO2017098154A1 (en) * | 2015-12-11 | 2017-06-15 | Renault S.A.S. | Method for diagnosing a catalyst for selective reduction of nitrogen oxides of an engine and associated device |
| CN109252923A (en) * | 2018-09-18 | 2019-01-22 | 潍柴动力股份有限公司 | Gas helps formula urea injection system and its lower electric blowing method |
| CN109296425A (en) * | 2018-12-18 | 2019-02-01 | 安徽江淮汽车集团股份有限公司 | Ammonia based on SCR system sprays amount control method |
-
2019
- 2019-02-11 CN CN201910110057.XA patent/CN109763883B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06343877A (en) * | 1993-03-26 | 1994-12-20 | Siemens Ag | Catalyst for decreasing nitrogen oxide in exhaust gas of internal combustion engine |
| US20110072798A1 (en) * | 2009-09-28 | 2011-03-31 | Herman Andrew D | NOx CONTROL REQUEST FOR NH3 STORAGE CONTROL |
| CN101713317A (en) * | 2009-11-12 | 2010-05-26 | 无锡市凯龙汽车设备制造有限公司 | Method for controlling addition amount of diesel engine tail gas selective catalytic reducing agent |
| CN102869431A (en) * | 2010-06-30 | 2013-01-09 | 恩亿凯嘉股份有限公司 | Flue gas-cleaning device and flue gas-cleaning method that use selective catalytic reduction catalyst |
| CN102877923A (en) * | 2011-07-15 | 2013-01-16 | 福特环球技术公司 | System and method for processing nh3 slippage of a selective catalyst reduction system |
| CN102330592A (en) * | 2011-10-09 | 2012-01-25 | 潍柴动力股份有限公司 | Exhaust emission aftertreatment equipment and method for diesel engine |
| CN106062331A (en) * | 2014-02-28 | 2016-10-26 | 斯堪尼亚商用车有限公司 | Exhaust treatment system and method for treatment of an exhaust stream |
| EP3139013A1 (en) * | 2015-09-01 | 2017-03-08 | Bayerische Motoren Werke Aktiengesellschaft | Method for operating an exhaust gas purification device |
| WO2017098154A1 (en) * | 2015-12-11 | 2017-06-15 | Renault S.A.S. | Method for diagnosing a catalyst for selective reduction of nitrogen oxides of an engine and associated device |
| CN105604653A (en) * | 2016-03-18 | 2016-05-25 | 安徽华菱汽车有限公司 | Urea jet control method and device and SCR system |
| CN109252923A (en) * | 2018-09-18 | 2019-01-22 | 潍柴动力股份有限公司 | Gas helps formula urea injection system and its lower electric blowing method |
| CN109296425A (en) * | 2018-12-18 | 2019-02-01 | 安徽江淮汽车集团股份有限公司 | Ammonia based on SCR system sprays amount control method |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110206621A (en) * | 2019-05-29 | 2019-09-06 | 一汽解放汽车有限公司 | A kind of the High-efficiency diesel engine after-treatment device and its control method of wide temperature window |
| CN110778385A (en) * | 2019-09-25 | 2020-02-11 | 潍柴动力股份有限公司 | Method and device for detecting leakage of urea injection system on line |
| CN113701959A (en) * | 2020-05-21 | 2021-11-26 | 北京福田康明斯发动机有限公司 | Vehicle exhaust pipeline air leakage detection method |
| CN113701959B (en) * | 2020-05-21 | 2024-05-31 | 北京福田康明斯发动机有限公司 | Air leakage detection method for vehicle exhaust pipeline |
| CN112523842A (en) * | 2020-10-29 | 2021-03-19 | 广西玉柴机器股份有限公司 | Temperature protection method for selective catalytic reduction system of internal combustion engine and related device |
| CN112780386B (en) * | 2021-01-29 | 2024-05-10 | 广西玉柴机器股份有限公司 | Aftertreatment two-stage urea injection system |
| CN112780386A (en) * | 2021-01-29 | 2021-05-11 | 广西玉柴机器股份有限公司 | Aftertreatment two-stage urea injection system |
| CN114592958A (en) * | 2021-02-09 | 2022-06-07 | 长城汽车股份有限公司 | Fuel engine tail gas aftertreatment system and method |
| CN114483268A (en) * | 2022-02-25 | 2022-05-13 | 湖南道依茨动力有限公司 | Ammonia leakage identification method and device, electronic equipment, engineering equipment and medium |
| CN115045738A (en) * | 2022-05-09 | 2022-09-13 | 潍柴动力股份有限公司 | Control method and device of urea injection system, processor and urea injection system |
| CN115045738B (en) * | 2022-05-09 | 2023-11-17 | 潍柴动力股份有限公司 | Control method and device of urea injection system, processor and urea injection system |
| CN115095411A (en) * | 2022-07-06 | 2022-09-23 | 潍柴动力股份有限公司 | Detection method and device for removal of selective catalytic reduction carrier |
| CN114961956B (en) * | 2022-07-06 | 2023-12-15 | 潍柴动力股份有限公司 | Selective catalytic reduction conversion efficiency diagnosis method and device |
| CN115095411B (en) * | 2022-07-06 | 2024-04-16 | 潍柴动力股份有限公司 | Detection method and device for removing selective catalytic reduction carrier |
| CN114961956A (en) * | 2022-07-06 | 2022-08-30 | 潍柴动力股份有限公司 | Method and device for diagnosing conversion efficiency of selective catalytic reduction |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109763883B (en) | 2021-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109763883A (en) | A kind of detection method of SCR system ammonia leakage, apparatus and system | |
| CN105556076B (en) | The after-treatment system handled exhaust | |
| CN102312712B (en) | System and method for determining an age of and controlling a selective catalytic reduction catalyst | |
| CN110645076B (en) | NH based on model3Leak diagnosis method | |
| CN101839162B (en) | Diagnostic systems and methods for selective catalytic reduction (scr) systems based on nox sensor feedback | |
| CN105308282B (en) | For the system and method for the selective catalytic reduction system operating for diagnosing motor vehicles | |
| CN103016112B (en) | Method and system for controlling emitted dose of urea solution by SCR (Selective Catalytic reduction) | |
| CN104884754B (en) | The trouble-shooter of emission-control equipment | |
| JP4764463B2 (en) | Exhaust gas purification control device and exhaust gas purification system for internal combustion engine | |
| CN104732055B (en) | The method for determining the correcting logic for SCR catalyst reaction model | |
| EP2749745A1 (en) | Method and apparatus for controlling urea injection amount of vehicle | |
| CN110284954A (en) | A kind of tail gas treatment system of diesel engine and control method | |
| CN106050371A (en) | System and method for injection control of urea in selective catalyst reduction | |
| CN101802358B (en) | Method for detecting the minimum opening time of a reducing agent feed device in an exhaust gas aftertreatment system comprising an SCR catalyst | |
| CN101946077A (en) | Method for controlling exhaust gas purification system and exhaust gas purification system | |
| CN103470345A (en) | Vehicle-based strategy for removing urea deposits from an SCR catalyst | |
| CN102022170A (en) | Intrusive SCR efficiency testing system and method for vehicle with low temperature exhaust gas | |
| CN103362614A (en) | Nitrogen dioxide generation diagnostic for a diesel after-treatment system | |
| CN107091143A (en) | A kind of monitoring method, supervising device and the system of diesel engine after treatment temperature signal | |
| WO2013090258A1 (en) | Diesel emission fluid quality detection system and method | |
| CN103362621B (en) | The non-methane carbon hydride conversion efficiency diagnosis of diesel aftertreatment system | |
| CN106014554B (en) | It calculates during regenerating by the method and apparatus of the NOx mass of NOx trap system reducing | |
| EP3073083B1 (en) | Exhaust gas control apparatus | |
| CN104411933A (en) | Deterioration detection system of exhaust purification device | |
| CN104662269A (en) | Exhaust purification system for internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |