CN108397267A - A kind of dpf regeneration temprature control method - Google Patents
A kind of dpf regeneration temprature control method Download PDFInfo
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- CN108397267A CN108397267A CN201810134090.1A CN201810134090A CN108397267A CN 108397267 A CN108397267 A CN 108397267A CN 201810134090 A CN201810134090 A CN 201810134090A CN 108397267 A CN108397267 A CN 108397267A
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0408—Methods of control or diagnosing using a feed-back loop
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1602—Temperature of exhaust gas apparatus
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to After-treatment technics technical fields, specifically disclose a kind of dpf regeneration temprature control method, wherein the dpf regeneration temprature control method includes：Determine the target temperature of DPF entrances；The target temperature inside DOC and the required HC open loops oil mass of DOC heatings are obtained according to the target temperature of the DPF entrances and DOC physical model calculatings；Actual temperature inside DOC is obtained according to DOC physical model calculatings；Feedback HC amounts are obtained according to the mathematic interpolation between actual temperature inside the DOC and the target temperature inside the DOC；The summation for calculating the HC open loops oil mass and the feedback HC amounts obtains HC demands.Dpf regeneration temprature control method provided by the invention reduces regeneration fuel oil consumption, improves fuel economy.
Description
Technical field
The present invention relates to After-treatment technics technical field more particularly to a kind of dpf regeneration temprature control methods.
Background technology
In the prior art, it in Diesel Engine After-treatment Technology field, has been devoted to improve fuel economy.But it is existing
Method all has some limitations.For example, Chinese patent CN104454085 A provide a kind of control method of dpf regeneration,
Whether this method is above threshold value to determine whether carrying out fuel oil injection by temperature before pressure difference before and after DPF and DOC, and fuel oil sprays
Amount corresponds to open loop oil spout arteries and veins spectrum by electronic control unit according to engine related parameters, obtains opened loop control fuel oil injection oil mass value, root
The DPF of temperature value and electronic control unit setting before the DPF filters acquired according to temperature sensor at DPF filter nose air intakes
The difference of filter target temperature numerical value runs PID algorithms, closed loop fuel control injection oil mass value is obtained, according to opened loop control
Fuel oil sprays oil mass value and closed loop fuel control injection oil mass is worth to fuel oil and sprays total oil mass value.This is a kind of conventional DPF
Method for controlling reproduction does not illustrate the determination of target temperature before DPF in this method, and target temperature can be in DPF before DPF
The burning of particle has a great impact.And the open loop oil mass of this method determines, to reach it is accurate be related to the correction parameter of flood tide with
Controller performance is adjusted, the correction parameter of the flood tide can lead to the extensive work in correction is developed naturally, especially in the time
In terms of resource, and also there is cost impact to control unit of engine.102140950 B of Chinese patent CN provide one kind
The method of distributive value control oxidation catalyzer outlet temperature, this method are according to diesel oxidation catalyst after control engine
（DOC）The open loop oil mass that the target temperature in exit sprays after determining, is then obtained according to the Current Temperatures at DOC outlet by closed loop
To the feedback oil mass of rear distributive value, distributive value after closed loop oil mass divided ring oil correct obtains correctly, the patent is in order to overcome
The shortcomings that open loop oil method for determination of amount of routine（Conventional method is related to the correction parameter of flood tide to adjust controller performance, is somebody's turn to do
The correction parameter of flood tide can lead to the extensive work in correction is developed naturally, especially in terms of time and resource, and it is also right
Control unit of engine has cost impact）Its open loop oil mass is determined using the method for the physical model of HC oxidations.The patent carries
Although the Physical Modeling of the HC oxidations gone out can theoretically solve the disadvantage that conventional method, its physical model is handle
As a whole, system complicated as one DOC, inner environmental conditions distribution is different, to establishing physics by entire DOC
The parameter of model causes different influences, so hardly resulting in accurate result using entire DOC as a physical model.
Therefore, how to reduce regeneration fuel oil consumption and improve fuel economy as those skilled in the art's skill urgently to be resolved hurrily
Art problem.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art, a kind of dpf regeneration temperature control is provided
Method processed, to solve the problems of the prior art.
As one aspect of the present invention, a kind of dpf regeneration temprature control method is provided, wherein the dpf regeneration temperature
Control method includes：
Determine the target temperature of DPF entrances；
The target temperature inside DOC and DOC liters are obtained according to the target temperature of the DPF entrances and DOC physical model calculatings
The required HC open loops oil mass of temperature；
Actual temperature inside DOC is obtained according to DOC physical model calculatings；
Feedback HC amounts are obtained according to the mathematic interpolation between actual temperature inside the DOC and the target temperature inside the DOC；
The summation for calculating the HC open loops oil mass and the feedback HC amounts obtains HC demands.
Preferably, the target temperature of the determining DPF entrances includes：
Determine that DPF regenerates safely permitted maximum temperature threshold and determines that DPF regenerates safely permitted minimum temperature threshold
Value.
Preferably, the permitted maximum secure threshold of regeneration includes the determining DPF safely：
Maximum DOC heating threshold values are calculated according to the oxidability of DOC；
Calculate the safe regeneration temperature threshold values of DPF in the worst cases.
Preferably, the DOC physical models include multiple piecemeals, and each piecemeal is an independent physical model.
Preferably, described that mesh inside DOC is obtained according to the target temperature and DOC physical model calculatings of the DPF entrances
Mark temperature includes the target temperature for multiple piecemeals that DOC is obtained according to the target temperature and DOC physical model calculatings of the DPF entrances
Degree,
It is described that obtain actual temperature inside DOC according to DOC physical model calculatings include being obtained according to the DOC physical model calculatings
The inside actual temperature of each piecemeal of DOC.
Preferably, according to the target temperature of the DPF entrances and DOC physical model calculatings obtain DOC heating it is required
HC open loop oil masses include：
Each piecemeal liter of DOC is calculated according to the target temperature of the entrance delivery temperature of each piecemeal of DOC and the DPF entrances
The required HC amounts of temperature；
The required HC amounts addition of all piecemeals heating of DOC is obtained into the required HC amounts of DOC heatings；
The required HC of DOC heatings is calculated to the required HC amounts of DOC heatings to the transformation efficiency of HC according to DOC to open
Ring oil mass.
Preferably, actual temperature passes through the DOC physics mould by temperature before DOC front exhaust HC amounts and DOC inside the DOC
Type is calculated.
Preferably, the difference meter according between actual temperature inside the DOC and the target temperature inside the DOC
Calculation obtains feedback HC amounts：
Calculate the difference according to the actual temperature at each piecemeals of DOC and the target temperature inside the DOC；
The difference is multiplied by feedback factor and obtains the feedback HC amounts of each piecemeals of DOC；
The feedback HC amounts addition of each piecemeals of DOC is obtained into the feedback HC amounts of DOC.
Preferably, the dpf regeneration temprature control method further includes：
The main jet oil mass of the DPF is modified.
Preferably, the main jet oil mass to the DPF be modified including：
DPF is sprayed each time oil mass be converted into best torque point generate same torque needed for oil mass；
The best torque point oil mass for controlling regeneration regime and nominal situation conversion is equal.
Dpf regeneration temprature control method provided by the invention determines limiting condition DPF most by DPF entrance target temperatures
Then the inlet temperature allowed greatly obtains an operating mode correction factor by engine operating condition, ensure to regenerate oil consumption most under each operating mode
It is low.DOC heating and oxidation amount of fuel determines obtains mesh inside DOC according to DPF entrances target temperature and DOC physical model calculatings first
Temperature curve is marked, is then obtained aoxidizing amount of fuel needed for DOC heatings according to DOC inlet delivery temperature and DOC physical model calculatings
That is open loop HC amounts, then according to the difference meter between the obtained DOC inside actual temperatures of DOC physical model calculatings and target temperature
Calculation obtains feedback HC amounts, and open loop HC amounts and feedback HC are added up as total HC demands, dpf regeneration temperature provided by the invention
Control method increases temperature control precision, reduces temperature rise time, achievees the purpose that reduce oil consumption.
Description of the drawings
Attached drawing is to be used to provide further understanding of the present invention, an and part for constitution instruction, 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 dpf regeneration temprature control method provided by the invention.
Fig. 2 is DPF entrances target temperature schematic diagram provided by the invention.
Fig. 3 is the diesel engine after treatment layout drawing provided by the invention equipped with granule capturing system.
Fig. 4 is that the present invention is to provide granule capturing system regeneration temperature control schematic diagrams.
Fig. 5 is the maximum allowable temperature computation schematic diagram of DPF entrances provided by the invention.
Fig. 6 is model DOC schematic diagram provided by the invention.
Fig. 7 is that the present invention is to provide multi-injection torque transition diagrams.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched
The specific implementation mode stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
It should be noted that diesel particulate trap（Diesel Particulate Filter, abbreviation DPF）It is one
Kind be mounted on diesel engine emissions system in particulate filter, it can before Particulate Emission substance enters air incite somebody to action
It is captured.Oxidation catalyst（Diesel Oxidation Catalyst, abbreviation DOC）, refer to mounted on diesel engine truck exhaust system
In, the device of pollutant discharge amount in exhaust can be reduced by various physics chemical actions.
As one aspect of the present invention, a kind of dpf regeneration temprature control method is provided, wherein as shown in Figure 1, described
Dpf regeneration temprature control method includes：
S110, the target temperature for determining DPF entrances；
S120, obtained according to the target temperature and DOC physical model calculatings of the DPF entrances target temperature inside DOC and
The required HC open loops oil mass of DOC heatings；
S130, actual temperature inside DOC is obtained according to DOC physical model calculatings；
S140, it is fed back according to the mathematic interpolation between actual temperature inside the DOC and the target temperature inside the DOC
HC amounts；
The summation of S150, the calculating HC open loops oil mass and the feedback HC amounts obtain HC demands.
Dpf regeneration temprature control method provided by the invention determines limiting condition DPF most by DPF entrance target temperatures
Then the inlet temperature allowed greatly obtains an operating mode correction factor by engine operating condition, ensure to regenerate oil consumption most under each operating mode
It is low.DOC heating and oxidation amount of fuel determines obtains mesh inside DOC according to DPF entrances target temperature and DOC physical model calculatings first
Temperature curve is marked, is then obtained aoxidizing amount of fuel needed for DOC heatings according to DOC inlet delivery temperature and DOC physical model calculatings
That is open loop HC amounts, then according to the difference meter between the obtained DOC inside actual temperatures of DOC physical model calculatings and target temperature
Calculation obtains feedback HC amounts, and open loop HC amounts and feedback HC are added up as total HC demands, dpf regeneration temperature provided by the invention
Control method increases temperature control precision, reduces temperature rise time, achievees the purpose that reduce oil consumption.
Fig. 3 is that the typical case of the diesel engine vent gas purification method of the present invention uses structure chart.Diesel engine 1 is in exhaust aftertreatment system
Grain catcher is installed on system（DPF）2 and oxidation catalyzer（DOC）3.
The main function of grain catcher 2 be traps diesel discharge particulate matter, when amount of collected reache a certain level with
Afterwards, regeneration activity is carried out, the burning particulate matter of trapping is fallen, is used repeatedly, to reduce dirt of the particle emission to air
Dye.
The main function of oxidation catalyzer 3 is when inlet temperature reaches its active temperature（Usually 230 DEG C）Afterwards, pass through oxygen
The diesel oil changed in tail gas further promotes exhaust temperature, so that grain catcher 2 can be completed to regenerate.
By adjust variable boost device 4, throttle valve 5, gas recirculation system 6 control air inflow, by postpone main jet and
Increase the measures such as nearly rear spray makes 3 inlet temperature of oxidation catalyzer reach initiation temperature to improve engine exhaust temperature.
3 inlet temperature sensor 10 of oxidation catalyzer is used for the closed-loop control of 3 inlet temperature of oxidation catalyzer, granule capturing
2 inlet temperature sensor 9 of device is used for the closed-loop control of 2 inlet temperature of grain catcher, 2 outlet temperature of grain catcher sensing
Device is for the prediction to 2 internal temperature of grain catcher.
In addition the system further includes diesel engine electric control system ECU7, for control engine it is normal work and it is regenerated
Control.
Specifically, the target temperature of the determining DPF entrances includes：
Determine that DPF regenerates safely permitted maximum temperature threshold and determines that DPF regenerates safely permitted minimum temperature threshold
Value.
It should be noted that regeneration minimum temperature threshold is obtained DPF by soot load different tests safely.
Further specifically, the permitted maximum secure threshold of regeneration includes the determining DPF safely：
Maximum DOC heating threshold values are calculated according to the oxidability of DOC；
Calculate the safe regeneration temperature threshold values of DPF in the worst cases.
It is understood that the permitted max-thresholds calculating of DPF inlet temperatures includes that DOC oxidabilities itself are determined
Regeneration reliability temperature threshold calculates under fixed maximum DOC heatings threshold calculations, worst case, and safety temperature is regenerated under worst case
Degree Threshold, which is that selection one is medium, to be regenerated with regenerated temperature, and regenerative process bust to idling is observed
Whether DPF internal temperatures are safe, step up regeneration temperature, can safe regenerated maximum temperature until finding.
It should be noted that the DPF inlet temperatures can be by the operating mode correction factor less than 1 to DPF inlet temperatures
Permitted max-thresholds are corrected to obtain so that regeneration fuel oil consumption is minimum under each operating mode.
Fig. 4 is granule capturing system regeneration temperature control schematic diagram.Granule capturing system regeneration temperature controls
Three parts：DOC temperature control passes through 3 entrance temperature of oxidation catalyzer when adjusting air inlet and increasing the controlling measurements regeneration such as nearly rear spray
Degree reaches initiation temperature so that HC can be aoxidized in oxidation catalyzer 3, improve the temperature that oxidation catalyzer 3 exports；DPF temperature
Degree control realizes the regeneration of carbon soot particles in grain catcher 2 by spray control 2 inlet temperature of grain catcher after increasing far；
The adjusting of main jet oil mass realizes that normal mode and regeneration mode torque are consistent when torque compensation is by regeneration.
Fig. 2 is DPF entrance target temperature schematic diagrames.DPF is calculated most according to engine operating condition and soot load first
The temperature allowed greatly calculates the minimum temperature that DPF can be needed for initiative regeneration, then according to engine speed according to soot load
DPF entrance target temperature operating mode correction factors, finally, temperature maximum allowable DPF and DPF entrance mesh is calculated with distributive value
Mark temperature case correction factor is multiplied and obtains final DPF by temperature maximum allowable DPF and minimum allowable temperature limit
Entrance target temperature.
Fig. 5 is the maximum allowable temperature computation schematic diagram of DPF entrances.The factor for influencing the maximum allowable temperature of DPF entrances is main
Including two aspects, first, the characteristic of DOC itself, DPF inlet temperatures are that exhaust is aoxidized and released energy so that arranging by DOC, HC
Gas lift temperature obtains, therefore looks into DOC heating maximum temperature MAP tables by engine operating condition and obtain DOC heating threshold limit values；Second is that
Regenerative process DPF safety factors, DPF in the worst case occurs in regenerative process in dpf regeneration safety requirements will ensure not
It is burned, is tabled look-up to obtain a basic DPF protection target temperature first according to soot load, then table look-up to obtain according to operating mode
Correction factor be multiplied to obtain final DPF protection temperature, specific practice is one soot load of selection and engine operating condition, if
The regeneration temperature of a fixed safety, is regenerated, and idling is suddenly dropped in regenerative process, is observed DPF internal temperatures, is judged DPF
Whether safety steps up regeneration temperature, until finding maximum safe regeneration temperature if safe.DOC heating maximum limits
Value and DPF protections temperature get the small value as the maximum allowable temperature of DPF entrances.
Specifically, the DOC physical models include multiple piecemeals, and each piecemeal is an independent physical model.
Further specifically, described to be obtained in DOC according to the target temperature and DOC physical model calculatings of the DPF entrances
The target temperature in portion includes obtaining multiple piecemeals of DOC according to the target temperature and DOC physical model calculatings of the DPF entrances
Target temperature,
It is described that obtain actual temperature inside DOC according to DOC physical model calculatings include being obtained according to the DOC physical model calculatings
The inside actual temperature of each piecemeal of DOC.
Further specifically, DOC heatings institute is obtained according to the target temperature of the DPF entrances and DOC physical model calculatings
The HC open loop oil masses needed include：
Each piecemeal liter of DOC is calculated according to the target temperature of the entrance delivery temperature of each piecemeal of DOC and the DPF entrances
The required HC amounts of temperature；
The required HC amounts addition of all piecemeals heating of DOC is obtained into the required HC amounts of DOC heatings；
The required HC of DOC heatings is calculated to the required HC amounts of DOC heatings to the transformation efficiency of HC according to DOC to open
Ring oil mass.
Preferably, actual temperature passes through the DOC physics mould by temperature before DOC front exhaust HC amounts and DOC inside the DOC
Type is calculated.
Preferably, the difference meter according between actual temperature inside the DOC and the target temperature inside the DOC
Calculation obtains feedback HC amounts：
Calculate the difference according to the actual temperature at each piecemeals of DOC and the target temperature inside the DOC；
The difference is multiplied by feedback factor and obtains the feedback HC amounts of each piecemeals of DOC；
The feedback HC amounts addition of each piecemeals of DOC is obtained into the feedback HC amounts of DOC.
Fig. 6 is model DOC schematic diagram.DOC computation models are divided into n block.After DPF entrance target temperatures determine, DOC
Outlet target temperature namely determination.The outlet target temperature that n-th piece of DOC is DOC outlet target temperature.For one piece of DOC points
Piece, target temperature assume that no HC oxidation releases energy when calculating, it is only necessary to the energy exchange for considering itself and environment, pass through to
Function of environment heat emission so that temperature drops to outlet target temperature by entrance target temperature, therefore to a determining DOC piecemeal when it goes out
Mouth target temperature determines that entrance target temperature can be calculated.Specifically, its export goal temperature of the n-th piecemeals of DOC
Degree is DOC outlet target temperature, and exchanging equation calculation by environmental energy obtains entrance target temperature namely the (n-1)th piecemeal
Outlet target temperature, equally successively calculate can be obtained 1 arrive each piecemeals of n outlet target temperature.When target temperature determines
Afterwards, start to calculate the HC amounts needed for DOC heatings, circular is as follows, and for the DOC piecemeals of a determination, its energy is main
Be vented the energy brought into including entrance, the energy that exiting exhaust gas is taken out of, energy that the energy and environment of HC emissions exchange and
The energy of DOC matrixes.For the 1st piecemeals of DOC, entrance delivery temperature is DOC inlet temperature, and outlet temperature is that the 1st piecemeals of DOC go out
Mouth target temperature can be obtained the required HC amounts of the 1st piecemeal heating according to the conservation of energy.The 1st piecemeal institute of result of calculation and DOC
Can the maximum HC amounts of conversion get the small value the HC amounts needed as the 1st piecemeal, can be calculated with the HC amounts that reason is calculated
1st piecemeal outlet temperature, as the 1st actual outlet target temperatures of piecemeal of DOC, the 1st piecemeal realistic objective temperature being calculated
Degree, as the 2nd piecemeal entrance delivery temperature can similarly be calculated HC amounts needed for the heating of each piecemeal and finally add successively
With all pieces of required HC amounts divided by DOC be to obtain DOC to be warming up to open loop HC needed for target temperature to the transformation efficiency of HC
Amount.Likewise, inside DOC actual temperature it is also possible that be calculated, according at DOC inlet exhaust actual temperature and exhaust
In HC amounts, the actual temperature of each piecemeal inside DOC is obtained by DOC physical models.Most always by actual temperature inside DOC and
Target temperature feeds back to obtain feedback HC amounts, and feedback HC amount divided ring HC amounts amendment obtains total required HC amounts.
Specifically, in order to improve cornering ability, the dpf regeneration temprature control method further includes：
The main jet oil mass of the DPF is modified.
Further specifically, the main jet oil mass to the DPF be modified including：
DPF is sprayed each time oil mass be converted into best torque point generate same torque needed for oil mass；
The best torque point oil mass for controlling regeneration regime and nominal situation conversion is equal.
Can take postponement main jet when dpf regeneration in order to meet temperature requirement, after increase spray etc. measures, these measures can influence
It is exported to engine torque, therefore in order to not influence cornering ability, needs to compensate torque, make nominal situation and regeneration work
There is not significant change in condition torque.Fig. 7 show multi-injection torque transition diagram.The fuel oil of nominal situation and regeneration regime
Injection is all equivalent to generate distributive value when same torque at best torque point, by adjusting regeneration main jet oil mass so that normal
Oil mass is equal at the best torque point converted under operating mode and regeneration regime.Specific practice is according to time for spraying and optimal torque point
Angular relationship determine the transforming relationship of respective spray torque output, that is, spray torque and optimal torsion that unit mass oil mass generates
The injection of square point generates the ratio of same torque oil mass, and the distributive value that each injection of nominal situation is converted into optimal torque point subtracts again
The raw operating mode optimal torque point distributive value that other multi-injections convert in addition to main jet, the main jet that obtained namely regenerated operating mode is postponed
Distributive value is converted into the distributive value of optimal torque point, then converts and closes further according to the distributive value of the main jet of postponement and optimal torque point
It can be obtained the main jet oil mass of postponement.
As shown in Fig. 2, being calculated including regeneration DPF entrance target temperatures, DOC heating and oxidation amount of fuel determines and torque is mended
It repays.DPF entrance target temperatures determine determines the maximum allowable inlet temperatures of limiting condition DPF by experiment first, then by starting
Machine operating mode obtains an operating mode correction factor, ensures that regeneration oil consumption is minimum under each operating mode.DOC heating and oxidation amount of fuel determines first
DOC internal object temperature curves are obtained according to DPF entrances target temperature and DOC physical model calculatings, are then arranged according to DOC inlet
Temperature degree and DOC physical model calculatings obtain aoxidizing amount of fuel i.e. open loop HC amounts needed for DOC heatings, then according to DOC physics moulds
Mathematic interpolation inside DOC that type is calculated between actual temperature and target temperature obtains feedback HC amounts, open loop HC amounts with instead
Feedback HC is added up as total HC demands, is increased temperature control precision, is reduced temperature rise time, reaches reduction oil consumption
Purpose.Torque compensation calculates according to regeneration regime and nominal situation multi-injection moment be converted into optimal torque point phase first
With torque fuel injection amount.Then optimal torque point amount of fuel same according to regeneration regime and nominal situation moment of torsion, that is, converting
It is equal, you can the amount of fuel of the optimal torque point of the main jet conversion of regeneration regime postponement to be obtained, finally according to regeneration main jet injection
Regeneration main jet distributive value is calculated in moment so that nominal situation goes to regeneration regime torque and significant change does not occur, and improves
Cornering ability.
Dpf regeneration temprature control method provided by the invention, can determine it is various in the case of optimal dpf regeneration target temperature
Degree, and can fast and accurately obtain the amount of fuel needed for DOC heatings, it is thus possible to that realizes dpf regeneration safely and fast has
Effect, and the fuel consumption of regenerative process is effectively reduced, improve engine economy.In addition, the present invention also provides regenerative processes
Torque compensation method so that it is normal that significant change does not occur to regeneration regime conversion torque, improve cornering ability.
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, in the essence for not departing from the present invention
In the case of refreshing 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 dpf regeneration temprature control method, which is characterized in that the dpf regeneration temprature control method includes：
Determine the target temperature of DPF entrances；
The target temperature inside DOC and DOC liters are obtained according to the target temperature of the DPF entrances and DOC physical model calculatings
The required HC open loops oil mass of temperature；
Actual temperature inside DOC is obtained according to DOC physical model calculatings；
Feedback HC amounts are obtained according to the mathematic interpolation between actual temperature inside the DOC and the target temperature inside the DOC；
The summation for calculating the HC open loops oil mass and the feedback HC amounts obtains HC demands.
2. dpf regeneration temprature control method according to claim 1, which is characterized in that the target of the determining DPF entrances
Temperature includes：
Determine that DPF regenerates safely permitted maximum temperature threshold and determines that DPF regenerates safely permitted minimum temperature threshold
Value.
3. dpf regeneration temprature control method according to claim 2, which is characterized in that the determining DPF regenerates safely institute
The maximum secure threshold of permission includes：
Maximum DOC heating threshold values are calculated according to the oxidability of DOC；
Calculate the safe regeneration temperature threshold values of DPF in the worst cases.
4. dpf regeneration temprature control method according to claim 1, which is characterized in that the DOC physical models include more
A piecemeal, each piecemeal are an independent physical model.
5. dpf regeneration temprature control method according to claim 4, which is characterized in that described according to the DPF entrances
Target temperature and DOC physical model calculatings obtain the target temperature inside DOC include according to the target temperatures of the DPF entrances and
DOC physical model calculatings obtain the target temperature of multiple piecemeals of DOC,
It is described that obtain actual temperature inside DOC according to DOC physical model calculatings include being obtained according to the DOC physical model calculatings
The inside actual temperature of each piecemeal of DOC.
6. dpf regeneration temprature control method according to claim 5, which is characterized in that according to the target of the DPF entrances
Temperature and DOC physical model calculatings obtain the required HC open loops oil mass of DOC heatings：
Each piecemeal liter of DOC is calculated according to the target temperature of the entrance delivery temperature of each piecemeal of DOC and the DPF entrances
The required HC amounts of temperature；
The required HC amounts addition of all piecemeals heating of DOC is obtained into the required HC amounts of DOC heatings；
The required HC of DOC heatings is calculated to the required HC amounts of DOC heatings to the transformation efficiency of HC according to DOC to open
Ring oil mass.
7. dpf regeneration temprature control method according to claim 1, which is characterized in that inside the DOC actual temperature by
Temperature is obtained by the DOC physical model calculatings before DOC front exhaust HC amounts and DOC.
8. dpf regeneration temprature control method according to claim 5, which is characterized in that described according to real inside the DOC
The mathematic interpolation between target temperature inside border temperature and the DOC obtains feedback HC amounts：
Calculate the difference according to the actual temperature at each piecemeals of DOC and the target temperature inside the DOC；
The difference is multiplied by feedback factor and obtains the feedback HC amounts of each piecemeals of DOC；
The feedback HC amounts addition of each piecemeals of DOC is obtained into the feedback HC amounts of DOC.
9. dpf regeneration temprature control method as claimed in any of claims 1 to 8, which is characterized in that the DPF
Regeneration temperature control method further includes：
The main jet oil mass of the DPF is modified.
10. dpf regeneration temprature control method according to claim 9, which is characterized in that the main jet to the DPF
Oil mass be modified including：
DPF is sprayed each time oil mass be converted into best torque point generate same torque needed for oil mass；
The best torque point oil mass for controlling regeneration regime and nominal situation conversion is equal.
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