CN109339909A - A kind of processing method of NOx, device and vehicle maintenance service system - Google Patents
A kind of processing method of NOx, device and vehicle maintenance service system Download PDFInfo
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- CN109339909A CN109339909A CN201811124682.1A CN201811124682A CN109339909A CN 109339909 A CN109339909 A CN 109339909A CN 201811124682 A CN201811124682 A CN 201811124682A CN 109339909 A CN109339909 A CN 109339909A
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- ammonia
- spraying system
- nox
- ammonia spraying
- engine
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- 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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
-
- 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
Abstract
The application provides processing method, device and the vehicle maintenance service system of a kind of NOx, and method is applied in vehicle maintenance service system, comprising: judges whether engine is in cold start or worst cold case；When the engine is in cold start or worst cold case, ammonia spraying system is controlled to open, ammonia is provided to vehicle tail gas treater system by the ammonia spraying system, the ammonia spraying system is located at the upstream of the oxidation catalyst in vehicle tail gas treater system；When the engine is not on cold start or worst cold case, controls the ammonia spraying system and be in close state.It prevents automobile exhaust temperature too low and causes vehicle tail gas treater system to be unable to get enough ammonias and prevent the problem of NOx in exhaust is from converting.
Description
Technical field
The present invention relates to automobile technical fields, and in particular to a kind of place for reducing the NOx of NOx content in vehicle exhaust
Manage method, apparatus and vehicle maintenance service system.
Background technique
Diesel engine in the car using increasingly extensive, while facing emission regulation and constantly add and tight constantly being dropped with emission limit
Low challenge.As adding for emission regulation is tight, need to further decrease the discharge of NOx, to realize minimum discharge.
Six post-processing technology of existing diesel Europe reduces exhaust pollutant using DOC+DPF+SCR technology path, wherein selecting
Reduction SCR is as the important technology for reducing Diesel NOx discharge for the catalysis of selecting property, has been obtained be widely applied at present.SCR's
Working principle is when delivery temperature reaches a certain range, and by spraying aqueous solution of urea into tail gas, urea is fast in vaporization section
Speed hydrolysis releases NH3, and selective catalytic reduction reaction occurs for the NOx in NH3 and tail gas, and is translated into nitrogen and water steaming
Gas, to realize the purpose of purification NOx.
SCR system is by spraying aqueous solution of urea into exhaust gas in the prior art, to reduce the discharge of NOx.But
Under cold conditions test loop or city driving operating condition, diesel exhaust gas temperature is low, is difficult to reach urea water after post treatment after pipeline
The temperature of solution causes under worst cold case, and NOx cannot be converted, and air pollution aggravates.
Summary of the invention
In view of this, the embodiment of the present invention provides processing method, device and the vehicle maintenance service system of a kind of NOx, with
It realizes when delivery temperature is too low, provides enough ammonias for vehicle maintenance service system.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
A kind of processing method of NOx is applied in vehicle maintenance service system, comprising:
Judge whether engine is in cold start or worst cold case；
When the engine is in cold start or worst cold case, control ammonia spraying system is opened, by described
Ammonia spraying system provides ammonia to vehicle tail gas treater system, and the ammonia spraying system is located at vehicle tail gas treater system
The upstream of oxidation catalyst in system, the ammonia sprayed by the ammonia spraying system trigger oxidation catalyst to NOx
Reproducibility；
When the engine is not on cold start or worst cold case, controls the ammonia spraying system and be in pass
Closed state.
Preferably, described to judge whether engine is in cold start or low temperature work in the processing method of above-mentioned NOx
Condition, comprising:
Judge whether engine water temperature is located between the first preset threshold and the second preset threshold；
Or whether delivery temperature is located between third predetermined threshold value and the 4th preset threshold,
If so, showing that the engine is in cold start-up or worst cold case.
Preferably, in the processing method of above-mentioned NOx, the control ammonia spraying system is opened, comprising:
The control ammonia spraying system is heated, to be released by solid-state ammonia in ammonia spraying system or urea liquid
Put ammonia.
Preferably, in the processing method of above-mentioned NOx, further includes:
Default mapping table, which is based on, according to capacity, the NOx content in exhaust and delivery temperature searches ammonia the amount of injection, base
The amount for the ammonia that the ammonia spraying system is exported is controlled in the ammonia the amount of injection.
A kind of processing unit of NOx is applied in vehicle maintenance service system, comprising:
Operating condition detection unit, for judging whether engine is in cold start or worst cold case；
Ammonia spraying system control unit, for controlling when the engine is in cold start or worst cold case
Ammonia spraying system is opened, and provides ammonia, the ammonia spray to vehicle tail gas treater system by the ammonia spraying system
It penetrates system and opens and be located between engine and oxidation catalyst etc.；When institute+state engine is not on cold start or low
When warm operating condition, controls the ammonia spraying system and be in close state.
Preferably, in the processing unit of above-mentioned NOx, the operating condition detection unit is judging whether engine is in cold start-up
When state or worst cold case, it is specifically used for:
Judge whether engine water temperature is located between the first preset threshold and the second preset threshold；
Or whether delivery temperature is located between third predetermined threshold value and the 4th preset threshold,
If so, showing that the engine is in cold start-up or worst cold case.
Preferably, in the processing unit of above-mentioned NOx, the ammonia spraying system control unit is in control ammonia spraying system
When unlatching, it is specifically used for:
The control ammonia spraying system is heated, to be released by solid-state ammonia in ammonia spraying system or urea liquid
Put ammonia.
Preferably, in the processing unit of above-mentioned NOx, further includes:
Ammonia injection quantity computation unit, is used for:
Default mapping table, which is based on, according to capacity, the NOx content in exhaust and delivery temperature searches ammonia the amount of injection, it will
The ammonia the amount of injection is sent to the ammonia spraying system control unit in the form instructed, to control ammonia injection system
System control unit controls the amount for the ammonia that the ammonia spraying system is exported based on the ammonia the amount of injection.
A kind of vehicle maintenance service system, comprising:
The oxidation catalyst being connected with exhaust emissions pipeline；
The ammonia spraying system of the inlet end of the oxidation catalyst is set；
The particle trap being connected with the outlet side of the oxidation catalyst；
The catalyzed conversion reductor being connected with the outlet side of the particle trap；
The urea injection apparatus of the catalyzed conversion reductor inlet end is set；
Further include: the processing unit of NOx described in above-mentioned any one.
Based on the above-mentioned technical proposal, above scheme provided in an embodiment of the present invention is in when detecting when the engine
When cold start or worst cold case, control ammonia spraying system is opened, by the ammonia spraying system at vehicle exhaust
It manages device system and ammonia is provided, to prevent automobile exhaust temperature too low and vehicle tail gas treater system is caused to be unable to get foot
Enough ammonia and prevent the problem of NOx in exhaust is from converting.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow diagram of the processing method of NOx disclosed in the embodiment of the present application；
Fig. 2 is a kind of structural schematic diagram of the processing unit of NOx disclosed in the embodiment of the present application；
Fig. 3 is a kind of structural schematic diagram of vehicle maintenance service system disclosed in the embodiment of the present application.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Be directed in the prior art cold start-up or temperature it is too low when, delivery temperature is too low, it is difficult to reach vehicle maintenance service
The hydrolysis temperature of urea injection apparatus in system, and cause the NOx in exhaust that cannot convert, so that air pollution exacerbation is asked
Topic, this application discloses the processing method of NOx a kind of, this method is applied in vehicle maintenance service system, participates in Fig. 1, method
May include:
Step S101: judging whether engine is in cold start or worst cold case, if it is judged that being yes, execution
Step S102, it is no to then follow the steps S103；
In the prior art, if delivery temperature can when automobile is in nominal situation (delivery temperature reaches requirement standard)
Adequately to the hydrolysis of urea of vehicle maintenance service system, vehicle maintenance service system is enabled to obtain enough ammonias, and
When automobile is in cold start-up or worst cold case, delivery temperature is too low, and no urea injection apparatus can not be vehicle maintenance service system
System provides enough ammonias, needs additional ammonia to provide device supplement ammonia at this time, until the delivery temperature reaches requirement
Standard；
Specifically, can judge whether engine is in cold start or worst cold case by delivery temperature, that is, such as
Fruit delivery temperature shows whether engine is in cold start or worst cold case lower than when requiring standard.
Step S102: when the engine is in cold start or worst cold case, control ammonia spraying system is opened；
In step, since the too low vehicle maintenance service system of delivery temperature can not obtain enough ammonias, the application is needed
It to assist providing ammonia by auxiliary device, the auxiliary device is the ammonia spraying system, when detecting cold start-up shape
State or worst cold case control the urea injection apparatus and open, by the ammonia spraying system to vehicle tail gas treater system
System provides ammonia, and the ammonia spraying system is located at the upstream of the oxidation catalyst in vehicle tail gas treater system, described
The ammonia ejected is supplied directly to the oxidation catalyst by ammonia spraying system, is sprayed by the ammonia spraying system
Ammonia triggering oxidation catalyst to the reproducibility of NOx, it can be seen that, technical solution provided by the present application, in worst cold case
When, by spraying ammonia to oxidation catalyst, reduced in exhaust gas using the catalysed reductive of oxidation catalyst at low temperature
NOx discharge, when delivery temperature increase after, the urea injection system is closed, at this point, vehicle tail gas treater system passes through
Injection urea mode the discharge amount of the NOx in exhaust gas is further decreased using SCR, thus take into account delivery temperature be in low temperature with
NOx emission processing under high temperature two states, is finally reached the purpose for reducing NOx discharge；
Step S103: when the engine is not on cold start or worst cold case, the ammonia injection is controlled
System is in close state；
In this step, when detecting that engine is not on cold start or worst cold case, show exhaust temperature
It is up to standard, enough ammonias can be provided for the vehicle tail gas treater system, be provided without ammonia spraying system auxiliary
Ammonia can control the ammonia spraying system at this time and close.
By the above method as it can be seen that being in when detecting when the engine by detection engine operating condition in above scheme
When cold start or worst cold case, control ammonia spraying system is opened, by the ammonia spraying system at vehicle exhaust
It manages device system and ammonia is provided, to prevent automobile exhaust temperature too low and vehicle tail gas treater system is caused to be unable to get foot
Enough ammonia and prevent the problem of NOx in exhaust is from converting.
Corresponding to above scheme, in order to remind the consumption state of ammonia releaser in ammonia spraying system described in user, this
Apply including: the detection device being arranged in ammonia spraying system, being used in technical solution disclosed in above-described embodiment
The ammonia burst size for detecting ammonia releaser, when the ammonia spraying system is in the open state, and the ammonia spraying system
Ammonia burst size when being lower than preset value, output will be exhausted for characterizing the ammonia releaser in the ammonia spraying system
Prompt information, to prompt user that the ammonia releaser in the ammonia spraying system is replenished in time.
In addition, disclosed herein as well is a kind of specific sides for judging engine and whether being in cold start or worst cold case
Method, specifically, this method may include:
Judge whether engine water temperature is located between the first preset threshold and the second preset threshold, wherein the engine can
Think diesel engine, first preset threshold is less than second preset threshold；
Or the delivery temperature of the detection oxidation catalyst inlet, judge whether delivery temperature is located at third and presets threshold
Between value and the 4th preset threshold, the third predetermined threshold value is less than the 4th preset threshold；
As long as meeting any one both above-mentioned Rule of judgment, show that the engine is in cold start-up or low temperature work
Condition.
Disclosed in the embodiment of the present application in technical solution, the ammonia spraying system can discharge ammonia in a manner of heating
Gas, when needing to control the unlatching of ammonia spraying system, control heating device is opened, and is sprayed by heating device to the control ammonia
System heating is penetrated, to discharge ammonia by the ammonia releaser in ammonia spraying system, wherein the ammonia releaser can be
Solid-state ammonia or urea liquid.
Specifically, in actual use, due to the NOx content and delivery temperature difference in capacity, exhaust, institute
The amount of the ammonia needed is different, and this programme can pre-establish a default mapping table, in the default mapping table record have with it is described
The corresponding ammonia amount of NOx content and delivery temperature in capacity, exhaust；It is discharged when needing to control the ammonia spraying system
When ammonia, the default mapping table is based on according to capacity, the NOx content in exhaust and delivery temperature and searches ammonia injection
Amount, the amount for the ammonia that the ammonia spraying system is exported is controlled based on the ammonia the amount of injection.
It corresponds to the above method, disclosed herein as well is in the processing unit of NOx a kind of, is applied to vehicle maintenance service
In system, referring to fig. 2, the apparatus may include:
Operating condition detection unit A, it is corresponding with step S101 in the above method, it is opened for judging whether engine is in cold
Dynamic state or worst cold case；
Ammonia spraying system control unit B, it is corresponding with step S102-S103 in the above method, for working as the hair
When motivation is in cold start or worst cold case, control ammonia spraying system is opened, by the ammonia spraying system to vapour
Tail gas processor system provides ammonia, and the ammonia spraying system, which is opened, to be located between engine and oxidation catalyst etc.；
When the engine is not on cold start or worst cold case, controls the ammonia spraying system and be in close state.
It corresponds to the above method, the operating condition detection unit is judging whether engine is in cold start or low temperature
When operating condition, it is specifically used for:
Judge whether engine water temperature is located between the first preset threshold and the second preset threshold；
Or whether delivery temperature is located between third predetermined threshold value and the 4th preset threshold,
If so, showing that the engine is in cold start-up or worst cold case.
It corresponds to the above method, the ammonia spraying system control unit is when controlling the unlatching of ammonia spraying system, tool
Body is used for:
The control ammonia spraying system is heated, to be released by solid-state ammonia in ammonia spraying system or urea liquid
Put ammonia.
It corresponds to the above method, above-mentioned apparatus further include: the detection device in ammonia spraying system is set, for examining
The ammonia burst size for surveying ammonia releaser, when the ammonia spraying system is in the open state, and the ammonia spraying system
When ammonia burst size is lower than preset value, exports and mentioned for characterize that the ammonia releaser in the ammonia spraying system will exhaust
Show information, to prompt user that the ammonia releaser in the ammonia spraying system is replenished in time.
It corresponds to the above method, in above-mentioned apparatus further include:
Ammonia injection quantity computation unit, is used for:
Default mapping table, which is based on, according to capacity, the NOx content in exhaust and delivery temperature searches ammonia the amount of injection, it will
The ammonia the amount of injection is sent to the ammonia spraying system control unit in the form instructed, to control ammonia injection system
System control unit controls the amount for the ammonia that the ammonia spraying system is exported based on the ammonia the amount of injection.
Specifically, the processing unit of NOx disclosed in the above embodiments of the present application, can integrate in automobile ECU.
Corresponding to the above device, disclosed herein as well is a kind of vehicle maintenance service systems, referring to Fig. 3, the system packet
It includes:
The oxidation catalyst 100 (DOC) being connected with exhaust emissions pipeline；
The ammonia spraying system 200 of the inlet end of the oxidation catalyst is set；
The particle trap 300 (DPF) being connected with the outlet side of the oxidation catalyst；
The catalyzed conversion reductor 400 (SCR) being connected with the outlet side of the particle trap；
The urea injection apparatus 500 of the catalyzed conversion reductor inlet end is set；
Further include: the processing unit 600 of NOx described in above-mentioned any one embodiment.
For convenience of description, it is divided into various modules when description system above with function to describe respectively.Certainly, implementing this
The function of each module can be realized in the same or multiple software and or hardware when application.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.System and system embodiment described above is only schematical, wherein the conduct
The unit of separate part description may or may not be physically separated, component shown as a unit can be or
Person may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can root
According to actual need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel can understand and implement without creative efforts.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of processing method of NOx is applied in vehicle maintenance service system characterized by comprising
Judge whether engine is in cold start or worst cold case；
When the engine is in cold start or worst cold case, control ammonia spraying system is opened, and passes through the ammonia
Spraying system provides ammonia to vehicle tail gas treater system, and the ammonia spraying system is located in vehicle tail gas treater system
Oxidation catalyst upstream, by the ammonia spraying system spray ammonia trigger oxidation catalyst NOx is gone back
Originality；
When the engine is not on cold start or worst cold case, controls the ammonia spraying system and be in closing shape
State.
2. the processing method of NOx according to claim 1, which is characterized in that described to judge whether engine is in cold and opens
Dynamic state or worst cold case, comprising:
Judge whether engine water temperature is located between the first preset threshold and the second preset threshold；
Or whether delivery temperature is located between third predetermined threshold value and the 4th preset threshold,
If so, showing that the engine is in cold start-up or worst cold case.
3. the processing method of NOx according to claim 1, which is characterized in that the control ammonia spraying system is opened, packet
It includes:
The control ammonia spraying system is heated, to pass through the solid-state ammonia or urea liquid release ammonia in ammonia spraying system
Gas.
4. the processing method of NOx according to claim 1, which is characterized in that further include:
Default mapping table is based on according to capacity, the NOx content in exhaust and delivery temperature and searches ammonia the amount of injection, is based on institute
State the amount that ammonia the amount of injection controls the ammonia that the ammonia spraying system is exported.
5. a kind of processing unit of NOx is applied in vehicle maintenance service system characterized by comprising
Operating condition detection unit, for judging whether engine is in cold start or worst cold case；
Ammonia spraying system control unit, for controlling ammonia when the engine is in cold start or worst cold case
Spraying system is opened, and provides ammonia, ammonia injection system to vehicle tail gas treater system by the ammonia spraying system
System, which is opened, to be located between engine and oxidation catalyst etc.；When the engine is not on cold start or worst cold case
When, it controls the ammonia spraying system and is in close state.
6. the processing unit of NOx according to claim 1, which is characterized in that the operating condition detection unit is started in judgement
When whether machine is in cold start or worst cold case, it is specifically used for:
Judge whether engine water temperature is located between the first preset threshold and the second preset threshold；
Or whether delivery temperature is located between third predetermined threshold value and the 4th preset threshold,
If so, showing that the engine is in cold start-up or worst cold case.
7. the processing unit of NOx according to claim 1, which is characterized in that the ammonia spraying system control unit exists
When controlling the unlatching of ammonia spraying system, it is specifically used for:
The control ammonia spraying system is heated, to pass through the solid-state ammonia or urea liquid release ammonia in ammonia spraying system
Gas.
8. the processing unit of NOx according to claim 1, which is characterized in that further include:
Ammonia injection quantity computation unit, is used for:
Default mapping table, which is based on, according to capacity, the NOx content in exhaust and delivery temperature searches ammonia the amount of injection, it will be described
Ammonia the amount of injection is sent to the ammonia spraying system control unit in the form instructed, to control the ammonia spraying system control
Unit processed controls the amount for the ammonia that the ammonia spraying system is exported based on the ammonia the amount of injection.
9. a kind of vehicle maintenance service system characterized by comprising
The oxidation catalyst being connected with exhaust emissions pipeline；
The ammonia spraying system of the inlet end of the oxidation catalyst is set；
The particle trap being connected with the outlet side of the oxidation catalyst；
The catalyzed conversion reductor being connected with the outlet side of the particle trap；
The urea injection apparatus of the catalyzed conversion reductor inlet end is set；
Further include: the processing unit of NOx described in claim 5-8 any one.
Priority Applications (1)
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