CN109944663A - A kind of after-treatment system control method and device - Google Patents
A kind of after-treatment system control method and device Download PDFInfo
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- CN109944663A CN109944663A CN201910184490.8A CN201910184490A CN109944663A CN 109944663 A CN109944663 A CN 109944663A CN 201910184490 A CN201910184490 A CN 201910184490A CN 109944663 A CN109944663 A CN 109944663A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
Abstract
After-treatment system control method and device provided by the invention, applied to automobile technical field, the system includes PNA, the primary heater for being set to PNA air inlet, it is set to the secondary heater of the gas outlet PNA, this method obtains the characteristic parameter of characterization after-treatment system operating condition first, if determining that after-treatment system in the operating condition that should improve the gas outlet PNA delivery temperature, controls primary heater and is in close state, while opening secondary heater according to characteristic parameter；If determining after-treatment system in the operating condition that should improve PNA air inlet delivery temperature according to characteristic parameter, control primary heater is in the open state.Heater is respectively set by the air inlet and exhaust outlet in PNA, by the control to heater, realizes the active control to PNA working condition, realizes the mutual cooperation of other after-treatment components in PNA and after-treatment system, improve NOxThe treatment effect of gas.
Description
Technical field
The invention belongs to automobile technical field more particularly to a kind of after-treatment system control method and device.
Background technique
In diesel engine post-processing system, PNA (Passive NO mostly is set in upstream portionxAbsorber, NOxIt inhales
Adnexa), NO can be adsorbed at low temperature using PNAxGas, and adsorbed NO is discharged at high temperaturexThe characteristic of gas carries out
Ultralow NOxEvaporative control.
To promote after-treatment system to the treatment effect of motor exhaust, SCR usually is set in the downstream of PNA
(Selective Catalytic Reduction, selective catalytic reduction device), DPF (Diesel Particulate
Filter, diesel particulate trap) and DOC (Diesel Oxidation Catalyst, diesel oxidation catalyst)
Equal components are used cooperatively with PNA.
In the prior art, for being provided with the after-treatment system of PNA, the working condition of PNA, which depends entirely on, flows through PNA
Exhaust temperature, absorption and desorption NOx gas process it is uncontrollable, cause the treatment effect of NOx- gas not good enough.
Summary of the invention
In view of this, can actively be controlled the purpose of the present invention is to provide a kind of after-treatment system control method and device
The working condition of PNA processed improves NOxThe treatment effect of gas, concrete scheme are as follows:
In a first aspect, the present invention provides a kind of after-treatment system control method, the after-treatment system includes: NOxAbsorption
Device PNA, the primary heater for being set to the PNA air inlet, and it is set to the secondary heater of the gas outlet PNA, institute
Stating control method includes:
After vehicle launch, the characteristic parameter for characterizing the after-treatment system operating condition is obtained；
If the gas outlet PNA delivery temperature should be improved by determining that the after-treatment system is according to the characteristic parameter
Operating condition, control the primary heater and be in close state, and open the secondary heater；
If the PNA air inlet delivery temperature should be improved by determining that the after-treatment system is according to the characteristic parameter
Operating condition, it is in the open state to control the primary heater.
Optionally, the operating condition that should improve the gas outlet PNA delivery temperature includes: engine cold-start work
Condition.
Optionally, the operating condition that should improve the PNA air inlet delivery temperature includes:
The selective catalytic reduction device SCR of the after-treatment system setting is in efficient operation temperature range, SCR hair
The diesel particulate trap DPF sending initiative regeneration request or passive regeneration of desulfurization request, after-treatment system setting out
Request.
Optionally, according to the characteristic parameter, the gas outlet the PNA row should be improved by determining that the after-treatment system is in
In the case where the operating condition of temperature degree, the after-treatment system control method of first aspect present invention offer further include:
Obtain the delivery temperature of the after-treatment system；
If the delivery temperature of the after-treatment system reaches preset temperature threshold, the secondary heater is closed.
Optionally, the feelings that the DPF issues the operating condition of passive regeneration request are in the judgement after-treatment system
Under condition, the control primary heater is in the open state, comprising:
It is in the open state that the primary heater is controlled in the first duration, wherein first duration is according to
The time required to PNA discharges institute's NOx adsorption gas and the intake air temperature of the DPF determines.
Optionally, the after-treatment system further include: acquire the first temperature sensor of the PNA air inlet delivery temperature
With the second temperature sensor of the acquisition gas outlet PNA delivery temperature, it is at the SCR in the judgement after-treatment system
In the case where the operating condition of efficient operation temperature range, the control primary heater is in the open state, comprising:
It is in the open state that the primary heater is controlled in the second duration, wherein second duration is according to
The measured value of first temperature sensor, the second temperature sensor measured value and the PNA in NOx gas absorption amount
It determines.
Optionally, determining that the after-treatment system is in SCR sending desulfurization request or the DPF is issued actively again
In the case where the operating condition of raw request, the control primary heater is in the open state, comprising:
It is in the open state that the primary heater is controlled in third duration, wherein the third duration is according to
The measured value of first temperature sensor determines.
Optionally, the after-treatment system control method that first aspect present invention any of the above-described provides, first heating
Device includes burner or electric heater, and the secondary heater includes burner or electric heater.
Second aspect, the present invention provide a kind of after-treatment system control device, and the after-treatment system includes: NOx absorption
Device PNA, the primary heater for being set to the PNA air inlet, and it is set to the secondary heater of the gas outlet PNA, institute
Stating control device includes:
First acquisition unit, for obtaining the characteristic parameter for characterizing the after-treatment system operating condition after vehicle launch；
First control unit, if determining that the after-treatment system is described in that should improve for according to the characteristic parameter
The operating condition of the gas outlet PNA delivery temperature controls the primary heater and is in close state, and opens second heating
Device；
Second control unit, if determining that the after-treatment system is described in that should improve for according to the characteristic parameter
The operating condition of PNA air inlet delivery temperature, it is in the open state to control the primary heater.
Optionally, the after-treatment system control device that second aspect of the present invention provides, further includes:
Second acquisition unit, for obtaining the delivery temperature of the after-treatment system；
Third control unit, if the delivery temperature for the after-treatment system reaches preset temperature threshold, described in closing
Secondary heater.
Based on the above-mentioned technical proposal, after-treatment system provided by the invention includes PNA, is set to the first of PNA air inlet
Heater, and it is set to the secondary heater of the gas outlet PNA, the control method is realized based on the after-treatment system, described
Control method obtains the characteristic parameter of characterization after-treatment system operating condition first, and then according to the characteristic parameter pair acquired
The operating condition of after-treatment system is determined, if it is decided that after-treatment system, which is in, should improve the gas outlet PNA delivery temperature
Operating condition then controls primary heater and is in close state, while opening secondary heater, is guaranteeing not influence inside PNA
Temperature, PNA can effectively adsorb NOxUnder the premise of gas, the delivery temperature of the gas outlet PNA is improved, so that the component in the downstream PNA
The available higher exhaust of temperature, preferably realizes corresponding function；If it is determined that after-treatment system be in should improve PNA into
The operating condition of port delivery temperature, control primary heater is in the open state, improves the temperature entered inside PNA rapidly,
Accelerate PNA and discharges adsorbed NOxThe process of gas allows the after-treatment components in the downstream PNA to obtain more NOxGas,
Meanwhile the delivery temperature for entering the after-treatment components in the downstream PNA is improved, further increase the work effect of corresponding after-treatment components
Fruit.Heater is respectively set by the air inlet and exhaust outlet in PNA in after-treatment system control method provided by the invention, leads to
The control to heater is crossed, realizes the active control to PNA working condition, realizes other post-processings in PNA and after-treatment system
The mutual cooperation of component can give full play to the effect of PNA, improve NOxThe treatment effect of gas.
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 the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the structural block diagram of after-treatment system provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart of after-treatment system control method provided in an embodiment of the present invention；
Fig. 3 is a kind of structural block diagram of after-treatment system control device provided in an embodiment of the present invention；
Fig. 4 is the structural block diagram of another after-treatment system control device provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
It is the structural block diagram of after-treatment system provided in an embodiment of the present invention referring to Fig. 1, Fig. 1, includes in the prior art
On the basis of the after-treatment system of PNA, after-treatment system provided in an embodiment of the present invention further include: primary heater 10, second
Heater 20, the first temperature sensor 30, second temperature sensor 40 and PNA50, for being set in after-treatment system
The other component in the downstream PNA, it is in figure and not specifically illustrated such as DOC, DPF and SCR etc., it is indicated with other component 60, this hair
Bright embodiment does not limit this.
Primary heater 10 and the first temperature sensor 30 are all set at the air inlet of PNA, wherein primary heater 10
When unlatching, the tail gas for flowing through PNA air inlet can be heated, improve the delivery temperature for entering PNA；First temperature sensor
30 for measuring the delivery temperature at PNA air inlet.
Secondary heater 20 and second temperature sensor 40 are all set at the gas outlet of PNA, wherein secondary heater 20
When unlatching, the tail gas for having the gas outlet PNA to flow out can be heated, to improve the delivery temperature in the downstream PNA；Second temperature passes
Sensor 40 is used to measure the delivery temperature at the gas outlet PNA.
Optionally, primary heater can be burner or electric heater, likewise, secondary heater is also possible to burn
Device or electric heater.It is envisioned that improving the consistency of product, primary heater and second for simplified control logic
Heater is preferably selected the heater of same middle form, for example primary heater and secondary heater all select burner, or, the
One heater and secondary heater simultaneous selection electric heater.
Based on above-mentioned after-treatment system, the embodiment of the present invention provides a kind of after-treatment system control method, referring to fig. 2, Fig. 2
It is a kind of flow chart of after-treatment system control method provided in an embodiment of the present invention, this method can be applied to Vehicle Controller
In, the optional such as car running computer of the Vehicle Controller has the controller of data-handling capacity, it is of course also possible to which use is separately provided
In the controller controlled vehicle after-treatment system, it is clear that network side also can be selected in the controller in some cases
Server is realized；Referring to Fig.1, after-treatment system control method provided in an embodiment of the present invention may include:
Step S100 after vehicle launch, obtains the characteristic parameter of characterization after-treatment system operating condition.
After vehicle start-up, after-treatment system is started to work, the spy of available characterization after-treatment system operating condition
Levy parameter.For different after-treatment systems, specific composition may be not quite similar, therefore, the feature ginseng that can be acquired
Amount can also have differences.
For example, characteristic parameter corresponding with SCR may include the work temperature of SCR for the after-treatment system for being provided with SCR
The desulfurization request signal etc. that degree, SCR are issued；For being provided with the after-treatment system of DPF, characteristic parameter corresponding with DPF can be with
The initiative regeneration request signal and passive regeneration request signal that intake air temperature, air outlet temperature and DPF including DPF are issued,
And delivery temperature of after-treatment system etc..
It should be noted that any characteristic parameter that can characterize after-treatment system operating condition is all optionally, all to belong to
In the range of protection of the embodiment of the present invention.
Step S110, according to characteristic parameter, the gas outlet PNA delivery temperature should be improved by determining whether after-treatment system is in
Operating condition, if so, executing step S120.
Optionally, during engine cold-start, the delivery temperature of engine and entire after-treatment system is all relatively low,
At this point, PNA should be made to be in low-temperature condition, guarantee that PNA can play NO in absorption exhaustxThe effect of gas.Therefore, engine is cold
Start operating performance is one of the operating condition that should improve the gas outlet PNA delivery temperature.
Step S120, control primary heater is in close state, and opens secondary heater.
When after-treatment system is in the operating condition that should improve the gas outlet PNA delivery temperature, should keep being in inside PNA
Low-temperature condition makes PNA play absorption NOxThe effect of gas, it is also desirable to the delivery temperature of the gas outlet PNA is improved, therefore,
Primary heater should be controlled to be in close state, and open secondary heater.
By taking engine cold-start operating condition as an example, it is in close state primary heater, it is ensured that in temperature inside PNA
Lower state is spent, PNA absorption NO is given full play toxThe effect of gas, simultaneously, in order to improve the exhaust in the downstream PNA as early as possible
Temperature is especially provided with the after-treatment system of SCR, and under engine cold-start operating condition, SCR reductant injection system is not opened also
Beginning, it is acted on, and is opened secondary heater, can be improved as early as possible into the delivery temperature inside SCR, make other post-processing sections such as SCR
Part plays a role as early as possible.
It optionally, can also be in real time or periodical after opening secondary heater and improving the downstream PNA after-treatment system temperature
The delivery temperature of acquisition after-treatment system can be closed when the delivery temperature of after-treatment system reaches preset temperature threshold
Secondary heater stops heating.Specifically, there may be a variety of facilities for after-treatment system, such as comprising PNA+SCR
After-treatment system, the after-treatment system etc. comprising PNA+DPF, therefore, the judgement for after-treatment system temperature should be specific
After-treatment system constitute and determine, with specific reference to mark of the temperature as entire after-treatment system temperature of where in after-treatment system
Standard, without limitation, any setting that can characterize entire post-processing temperature is all optional to the embodiment of the present invention.
Step S130, according to characteristic parameter, PNA air inlet delivery temperature should be improved by determining whether after-treatment system is in
Operating condition, if so, executing step S140.
Optionally, the operating condition of Ying Tigao PNA air inlet delivery temperature includes at least: SCR is in efficient operation temperature
Section, SCR issue desulfurization request, DPF issues initiative regeneration request or passive regeneration request, when after-treatment system is in above-mentioned
When a kind of operating condition of anticipating, it can transfer to execute step S140.
Step S140, control primary heater are in the open state.
When after-treatment system is in the operating condition that should improve PNA air inlet delivery temperature, primary heater should be controlled
It is in the open state, the exhaust for entering PNA is heated, the temperature for entering the exhaust inside PNA is improved.
Optionally, when DPF issues passive regeneration request in after-treatment system, DPF needs higher NOx/ soot (starts
The particulate matter of machine discharge) ratio, and then promote effective progress of passive regeneration process, it is also desirable to keep passive regeneration mistake
Journey is in reasonable temperature range.When after-treatment system is in this operating condition, need to control the first heating in the first duration
Device is in the open state, and PNA is promoted to discharge adsorbed NOx gas, promotes the NO of the upstream DPFx/ soot ratio, is improved simultaneously
The temperature of the upstream DPF promotes the efficient progress of passive regeneration.It is adsorbed specifically, first duration can be discharged according to PNA
The time required to NOx gas and the intake air temperature of DPF determines.
It optionally,, can also be simultaneously for the fast lifting for promoting DPF upstream temperature when DPF issues passive regeneration request
Secondary heater is opened, primary heater and secondary heater simultaneously heat the exhaust for entering DPF.It needs to illustrate
It is that the control for the starting time of secondary heater is dependent only on the air inlet temperature of DPF, when the temperature of DPF air inlet
After reaching corresponding preset temperature threshold, secondary heater can be closed.
Optionally, after vehicle start-up, with the raising of engine exhaust temperature, vehicle will be entered just by cold start
Normal operating condition.Correspondingly, the temperature of SCR will also be in and be able to carry out efficient operation for the after-treatment system for being provided with SCR
Temperature range, for example (temperature range of different SCR, efficient operation can be slightly different, and the present invention is real at 300 DEG C or so
Example is applied not limit this), SCR can 100% conversion exhaust in NOxGas is at this point it is possible to control primary heater
Open state promotes PNA temperature, and PNA is made to discharge adsorbed NOxGas, to continue to adsorb NO in subsequent worst cold casex
Gas, to improve the utilization rate of PNA.
Further, the heating with primary heater to PNA intake air temperature, the adsorbed NO of PNAxGas can release
To finish, therefore, the opening time of primary heater can be defined, control primary heater is opened in the second duration,
After second duration, primary heater is closed.Optionally, the second duration can according to the measured value of the first temperature sensor,
NO in the measured value and PNA of second temperature sensorxGas absorption amount determines.It should be noted that discharging institute for PNA
Adsorb NOxThe calculating of time used in gas can be used calculation method in the prior art and realize, for meter in the embodiment of the present invention
Calculate the specific method of the second duration without limitation, certainly, the second duration can equally carry out previously given based on experience value.
Optionally, when DPF issues initiative regeneration request or SCR issues desulfurization request, DPF or SCR require higher
Temperature, to carry out effective initiative regeneration or desulfurization.It under both operating conditions, requires PNA and keeps higher temperature, therefore, need
It is in the open state primary heater to be controlled in third duration.Specifically, the setting for third duration, it can be according to
The measured value of one temperature sensor determines.For example, when the measured value of the first temperature sensor is less than the first limit value, the first heating
Device is opened；When the measured value of the first temperature sensor is greater than the second limitation, control primary heater is closed.
In conclusion after-treatment system control method provided in an embodiment of the present invention, pass through air inlet in PNA and exhaust
Heater is respectively set in mouth, passes through the control to heater, realizes the active control to PNA working condition, realizes PNA and locates afterwards
The mutual cooperation of other after-treatment components in reason system can give full play to the effect of PNA, improve NOxThe treatment effect of gas.
Further, the working efficiency of other after-treatment components in after-treatment system can also be effectively improved, so that rear place
Reason system is further enhanced to the treatment effect of exhaust.
It should be noted that for post-processing the judgement of operating condition and corresponding controlling in the embodiment of the present invention
Journey is merely illustrative, and not considered critical is corresponding executes sequence, i.e. the control process of step S130 and step S140 can
Before being located at step S110 and step S120, first whether progress after-treatment system, which is in, should improve PNA air inlet delivery temperature
Operating condition judgement.It is conceivable that in practical applications, vehicle is from starting to normally travel, engine exhaust
Temperature necessarily has a change procedure from low to high, and therefore, above-described embodiment steps presented sequence meets vehicle
Actual use process.
Further, it is also conceivable to, for not needing the engine exhaust temperature of raising PNA air inlet, while
The operating condition for not needing the engine exhaust temperature of the raising gas outlet PNA, should control simultaneously at primary heater and secondary heater
In closed state.
After-treatment system control device provided in an embodiment of the present invention is introduced below, post-processing system described below
System control device may be considered the after-treatment system control method that embodiment provides to realize the present invention, need in central equipment
The functional module framework of setting；Be described below content can with above it is cross-referenced.
Fig. 3 is a kind of structural block diagram of after-treatment system control device provided in an embodiment of the present invention, referring to Fig. 3, the dress
It sets and may include:
First acquisition unit 10, for after vehicle launch, obtaining the feature ginseng for characterizing the after-treatment system operating condition
Amount；
First control unit 20, if institute should be improved by determining that the after-treatment system is in for according to the characteristic parameter
The operating condition for stating the gas outlet PNA delivery temperature controls the primary heater and is in close state, and opens described second and add
Hot device；
Second control unit 30, if institute should be improved by determining that the after-treatment system is in for according to the characteristic parameter
It is in the open state to control the primary heater for the operating condition for stating PNA air inlet delivery temperature.
Optionally, referring to fig. 4, Fig. 4 is the structure of another after-treatment system control device provided in an embodiment of the present invention
Block diagram, on the basis of embodiment shown in Fig. 3, the device further include:
Second acquisition unit 40, for obtaining the delivery temperature of the after-treatment system；
Third control unit 50 closes institute if the delivery temperature for the after-treatment system reaches preset temperature threshold
State secondary heater.
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.
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 in the case where not departing from core of the invention thought or scope.Therefore, originally
Invention is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein
Consistent widest scope.
Claims (10)
1. a kind of after-treatment system control method, which is characterized in that the after-treatment system includes: NOxAbsorber PNA, it is set to
The primary heater of the PNA air inlet, and it is set to the secondary heater of the gas outlet PNA, the control method packet
It includes:
After vehicle launch, the characteristic parameter for characterizing the after-treatment system operating condition is obtained；
If determining that the after-treatment system is in the fortune that should improve the gas outlet PNA delivery temperature according to the characteristic parameter
Row operating condition controls the primary heater and is in close state, and opens the secondary heater；
If determining that the after-treatment system is in the fortune that should improve the PNA air inlet delivery temperature according to the characteristic parameter
It is in the open state to control the primary heater for row operating condition.
2. after-treatment system control method according to claim 1, which is characterized in that described to improve the PNA outlet
The operating condition of mouth delivery temperature includes: engine cold-start operating condition.
3. after-treatment system control method according to claim 1, which is characterized in that described to improve the PNA air inlet
The operating condition of mouthful delivery temperature includes:
The selective catalytic reduction device SCR of the after-treatment system setting is in efficient operation temperature range, the SCR is issued and taken off
Sulphur request, the diesel particulate trap DPF sending initiative regeneration request of after-treatment system setting or passive regeneration are requested.
4. after-treatment system control method according to claim 1, which is characterized in that according to the characteristic parameter, sentence
In the case that the fixed after-treatment system is in the operating condition that should improve the gas outlet PNA delivery temperature, the method is also
Include:
Obtain the delivery temperature of the after-treatment system；
If the delivery temperature of the after-treatment system reaches preset temperature threshold, the secondary heater is closed.
5. after-treatment system control method according to claim 3, which is characterized in that determining at the after-treatment system
In the case where the operating condition that the DPF issues passive regeneration request, the control primary heater is in opening state
State, comprising:
It is in the open state that the primary heater is controlled in the first duration, wherein first duration is released according to the PNA
The time required to putting institute's NOx adsorption gas and the intake air temperature of the DPF determines.
6. after-treatment system control method according to claim 3, which is characterized in that the after-treatment system further include:
Acquire the first temperature sensor of the PNA air inlet delivery temperature and the second temperature of the acquisition gas outlet PNA delivery temperature
Sensor is spent, is in the case where SCR is in the operating condition of efficient operation temperature range in the judgement after-treatment system
Under, the control primary heater is in the open state, comprising:
It is in the open state that the primary heater is controlled in the second duration, wherein second duration is according to described first
The measured value of temperature sensor, the second temperature sensor measured value and the PNA in NOx gas absorption amount determine.
7. after-treatment system control method according to claim 6, which is characterized in that determining at the after-treatment system
In the case that the SCR issues desulfurization request or the DPF issues the operating condition of initiative regeneration request, described in the control
Primary heater is in the open state, comprising:
It is in the open state that the primary heater is controlled in third duration, wherein the third duration is according to described first
The measured value of temperature sensor determines.
8. after-treatment system control method according to claim 1-7, which is characterized in that the primary heater
Including burner or electric heater, the secondary heater includes burner or electric heater.
9. a kind of after-treatment system control device, which is characterized in that the after-treatment system includes: NOx absorber PNA, setting
In the primary heater of the PNA air inlet, and it is set to the secondary heater of the gas outlet PNA, the control device
Include:
First acquisition unit, for obtaining the characteristic parameter for characterizing the after-treatment system operating condition after vehicle launch；
First control unit, if should improve the PNA for according to the characteristic parameter, determining that the after-treatment system is in and go out
The operating condition of port delivery temperature controls the primary heater and is in close state, and opens the secondary heater；
Second control unit, if for according to the characteristic parameter, determine the after-treatment system be in should improve the PNA into
It is in the open state to control the primary heater for the operating condition of port delivery temperature.
10. after-treatment system control device according to claim 9, which is characterized in that described device further include:
Second acquisition unit, for obtaining the delivery temperature of the after-treatment system；
Third control unit closes described second if the delivery temperature for the after-treatment system reaches preset temperature threshold
Heater.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943425A (en) * | 2021-03-10 | 2021-06-11 | 一汽解放汽车有限公司 | Post-treatment electric heating control system |
| CN114278414A (en) * | 2021-12-30 | 2022-04-05 | 潍柴动力股份有限公司 | NOx aftertreatment system and control method thereof |
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| CN112943425B (en) * | 2021-03-10 | 2022-05-20 | 一汽解放汽车有限公司 | Post-treatment electric heating control system |
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| CN114278414B (en) * | 2021-12-30 | 2023-01-20 | 潍柴动力股份有限公司 | NOx aftertreatment system and control method thereof |
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