CN109973175A - Temprature control method when diesel particulate trap regenerates - Google Patents
Temprature control method when diesel particulate trap regenerates Download PDFInfo
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- CN109973175A CN109973175A CN201910213746.3A CN201910213746A CN109973175A CN 109973175 A CN109973175 A CN 109973175A CN 201910213746 A CN201910213746 A CN 201910213746A CN 109973175 A CN109973175 A CN 109973175A
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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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
- F01N3/02—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
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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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- Chemical & Material Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The present invention relates to temprature control methods when a kind of regeneration of diesel particulate trap, it comprises steps of determining that DPF entrance target temperature；According to DPF entrance target temperature, open loop HC amount needed for obtaining target temperature and DOC heating inside DOC by DOC physical model calculating；Feedback HC amount is calculated in difference between the actual temperature inside DOC obtained according to DOC physical model calculating and the target temperature inside DOC；Open loop HC amount and feedback HC are added up as total HC demand；Influence according to multi-injection to torque is modified main jet oil mass so that regeneration regime and nominal situation torque as close as possible to.Utilize the present invention, it can determine dpf regeneration target temperature optimal in various situations, amount of fuel needed for capable of fast and accurately obtaining DOC heating, it is thus possible to realize the safely and fast effective of dpf regeneration, and the fuel consumption of regenerative process is effectively reduced, improve the economy of engine.
Description
Technical field
The present invention relates to a kind of method for controlling reproduction of diesel particulate trap, and present invention relates particularly to a kind of diesel engines
Temprature control method when grain catcher regenerates.
Background technique
Chinese patent CN104454085A provides a kind of control method of dpf regeneration, and this method is caught by DPF(particle
Storage) front and back pressure difference and DOC(oxidation catalyzer) before temperature whether be above threshold value to determine whether carry out fuel oil injection, fuel oil
The amount of injection corresponds to open loop oil spout arteries and veins spectrum according to engine related parameters by electronic control unit, obtains opened loop control fuel oil injection oil mass
Value is set according to temperature value before the DPF filter of temperature sensor acquisition at DPF filter nose air intake and electronic control unit
DPF filter target temperature numerical value difference, run PID algorithm, closed loop fuel control injection oil mass value obtained, according to opening
Ring control fuel oil injection oil mass value and closed loop fuel control injection oil mass value obtain fuel oil and spray total oil mass value.This is a kind of routine
Dpf regeneration control method.
The determination of target temperature before DPF is not illustrated in this method, target temperature influences whether in DPF before DPF
The burning of particle has a great impact, and this method open loop oil mass determine, to reach accurately be related to the correction parameter of flood tide with
Controller performance is adjusted, the correction parameter of the flood tide will lead to the extensive work in correction exploitation naturally, especially in the time
There is cost impact to control unit of engine in terms of resource, and also.
Chinese patent CN102140950 B provides distributive value control oxidation catalyzer outlet temperature after a kind of control engine
The method of degree, this method are the open loop oil mass sprayed after being determined according to the target temperature in the exit diesel oxidation catalyst (DOC), so
The feedback oil mass of rear distributive value is obtained by closed loop according to the Current Temperatures at DOC outlet afterwards, closed loop oil mass divided ring oil mass is repaired
The shortcomings that distributive value after just obtaining correctly, the patent is for conventional open loop oil method for determination of amount, (conventional method was related to huge
For the correction parameter of amount to adjust controller performance, the correction parameter of the flood tide will lead to a large amount of works in correction exploitation naturally
Make, especially in terms of time and resource, and also to control unit of engine have cost impact) its open loop oil mass use HC
The method of the physical model of oxidation determines.
Although the shortcomings that Physical Modeling for the HC oxidation that the patent proposes theoretically is able to solve conventional method,
Its physical model be entire DOC as a whole, system DOC complicated as one, inner environmental conditions be distributed not
Together, different influences is caused to the parameter for establishing physical model, so hardly resulting in using entire DOC as a physical model
Accurate result.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies in the prior art, provide one kind can reduce regeneration fuel oil consumption,
Temprature control method when improving fuel economy and improving the diesel particulate trap regeneration of driving performance.
According to technical solution provided by the invention, the temprature control method when diesel particulate trap regenerates includes
Following steps:
Firstly, determining DPF entrance target temperature；
Then, according to DPF entrance target temperature, target temperature and DOC liter inside DOC are obtained by DOC physical model calculating
The required open loop HC amount of temperature；The actual temperature inside DOC and the target temperature inside DOC obtained according to DOC physical model calculating
Feedback HC amount is calculated in difference between degree；Open loop HC amount and feedback HC are added up as total HC demand；
Finally, the influence according to multi-injection to torque, is modified main jet oil mass, so that regeneration regime and nominal situation are turned round
Square as close as possible to.
The determination of the DPF entrance target temperature regenerates safely permitted maximum temperature threshold firstly the need of determining DPF
Permitted minimum temperature threshold is regenerated safely with DPF；Wherein, regeneration minimum temperature threshold is different by soot load safely by DPF
Test obtains.
The permitted max-thresholds of DPF inlet temperature calculate the maximum DOC liter determined including DOC oxidability itself
It regenerates reliability temperature threshold under warm threshold calculations, worst case to calculate, regeneration reliability temperature threshold determines method under worst case
It is that selection one is medium to be regenerated with regenerated temperature, whether regenerative process bust to idling observation DPF internal temperature
Safety, steps up regeneration temperature, can safe regenerated maximum temperature until finding.
The DPF inlet temperature can pass through the maximum threshold permitted to DPF inlet temperature of the operating condition correction factor less than 1
Value amendment obtains, so that regeneration fuel oil consumption is minimum under each operating condition.
The foundation of the DOC physical model is the piecemeal for DOC being divided into n very little, and each piecemeal establishes an independent object
Manage model.
The DOC internal object temperature is the n of the DOC obtained by DOC outlet target temperature by DOC physical model calculating
The target temperature in a each piece of downstream of piecemeal.
HC amount calculation method needed for the DOC heating is, according to each piecemeal entrance delivery temperature of DOC and target temperature
HC amount needed for calculating each piecemeal heating, then sums it up HC oil mass and the conversion for considering DOC to HC needed for all piecemeals heat up
Feedback HC amount needed for efficiency finally obtains DOC heating.
Actual temperature is obtained by temperature before DOC front exhaust HC amount and DOC by DOC physical model calculating inside the DOC.
The feedback HC amount calculation method be at each piecemeal of DOC actual temperature and the difference of target temperature multiplied by feedback factor
Then adduction obtains, wherein feedback factor is different and different according to each piecemeal present position.
Influence of the multi-injection to torque, calculation method are that injection oil mass each time is converted into best torque point
Oil mass needed for generating same torque, the best torque point oil mass for controlling regeneration regime and nominal situation conversion is equal, Ji Kebao
It is constant to demonstrate,prove torque, best torque point is the fuel oil time for spraying that unit mass fuel oil does work most in the case where one determines operating condition.
Using the present invention, dpf regeneration target temperature optimal in various situations can determine, and can be fast and accurately
Amount of fuel needed for obtaining DOC heating, it is thus possible to realize the safely and fast effective of dpf regeneration, and effectively reduce regenerative process
Fuel consumption, improve the economy of engine.In addition, the present invention also provides regenerative process torque compensation methods, so that just
Significant change does not often occur to regeneration regime conversion torque, improves driving performance.
Detailed description of the invention
Fig. 1 is the diesel engine after treatment layout drawing equipped with grain catcher.
Fig. 2 is grain catcher regeneration temperature control schematic diagram.
Fig. 3 is DPF entrance target temperature schematic diagram.
Fig. 4 is the maximum allowable temperature computation schematic diagram of DPF entrance.
Fig. 5 is model DOC schematic diagram.
Fig. 6 is multi-injection torque transition diagram.
Specific embodiment
The present invention is further explained in the light of specific embodiments.
The HC referred in the present invention i.e. fuel consumption.
Temprature control method when a kind of diesel particulate trap regeneration of the invention the following steps are included:
Firstly, determining DPF entrance target temperature；
Then, according to DPF entrance target temperature, target temperature and DOC liter inside DOC are obtained by DOC physical model calculating
The required open loop HC amount of temperature；The actual temperature inside DOC and the target temperature inside DOC obtained according to DOC physical model calculating
Feedback HC amount is calculated in difference between degree；Open loop HC amount and feedback HC amount are added up as total HC demand；
Finally, the influence according to multi-injection to torque, is modified main jet oil mass, so that regeneration regime and nominal situation are turned round
Square as close as possible to.
The determination of the DPF entrance target temperature regenerates safely permitted maximum temperature threshold firstly the need of determining DPF
Permitted minimum temperature threshold is regenerated safely with DPF；Wherein, regeneration minimum temperature threshold is different by soot load safely by DPF
Test obtains.
The permitted max-thresholds of DPF inlet temperature calculate the maximum DOC liter determined including DOC oxidability itself
It regenerates reliability temperature threshold under warm threshold calculations, worst case to calculate, regeneration reliability temperature threshold determines method under worst case
It is that selection one is medium to be regenerated with regenerated temperature, whether regenerative process bust to idling observation DPF internal temperature
Safety, steps up regeneration temperature, can safe regenerated maximum temperature until finding.
The DPF inlet temperature can pass through the maximum threshold permitted to DPF inlet temperature of the operating condition correction factor less than 1
Value amendment obtains, so that regeneration fuel oil consumption is minimum under each operating condition.
The foundation of the DOC physical model is the piecemeal for DOC being divided into n very little, and each piecemeal establishes an independent object
Manage model.
The DOC internal object temperature is the n of the DOC obtained by DOC outlet target temperature by DOC physical model calculating
The target temperature in a each piece of downstream of piecemeal.
HC amount calculation method needed for the DOC heating is, according to each piecemeal entrance delivery temperature of DOC and target temperature
HC amount needed for calculating each piecemeal heating, then sums it up HC oil mass and the conversion for considering DOC to HC needed for all piecemeals heat up
Feedback HC amount needed for efficiency finally obtains DOC heating.
Actual temperature is obtained by temperature before DOC front exhaust HC amount and DOC by DOC physical model calculating inside the DOC.
The feedback HC amount calculation method be at each piecemeal of DOC actual temperature and the difference of target temperature multiplied by feedback factor
Then adduction obtains, wherein feedback factor is different and different according to each piecemeal present position.
Influence of the multi-injection to torque, calculation method are that injection oil mass each time is converted into best torque point
Oil mass needed for generating same torque, the best torque point oil mass for controlling regeneration regime and nominal situation conversion is equal, Ji Kebao
It is constant to demonstrate,prove torque, best torque point is the fuel oil time for spraying that unit mass fuel oil does work most in the case where one determines operating condition.
Control method of the invention includes that regeneration DPF entrance target temperature calculates, and DOC heating and oxidation amount of fuel is determining and turns round
Square compensation.DPF entrance target temperature, which determines, determines the maximum allowable inlet temperature of limiting condition DPF by testing first, then by
Engine operating condition obtains an operating condition correction factor, guarantees that regeneration oil consumption is minimum under each operating condition.DOC heating and oxidation amount of fuel determines
DOC internal object temperature curve is obtained according to DPF entrance target temperature and DOC physical model calculating first, is then entered according to DOC
Mouth delivery temperature and DOC physical model calculating obtain aoxidizing amount of fuel i.e. open loop HC amount needed for DOC heating, then according to DOC object
Feedback HC amount, open loop HC amount is calculated in difference inside the DOC that reason model is calculated between actual temperature and target temperature
It adds up with feedback HC as total HC demand, increases temperature control precision, reduce temperature rise time, reach reduction
The purpose of oil consumption.Torque compensation is converted into according to regeneration regime and the calculating of nominal situation multi-injection time for spraying optimal first
Torque point same torque fuel injection amount.Then optimal torque same according to regeneration regime and nominal situation moment of torsion, that is, converting
Point amount of fuel is equal, the amount of fuel of the optimal torque point of the main jet conversion of regeneration regime postponement can be obtained, finally according to regeneration
Regeneration main jet distributive value is calculated in main jet time for spraying, so that nominal situation goes to regeneration regime torque and do not occur obviously to become
Change, improves driving performance.
Fig. 1 is that the typical case of diesel engine vent gas purification method of the present invention uses structure chart.Diesel engine 1 is in exhaust aftertreatment
Grain catcher 2 and oxidation catalyzer 3 are installed in system.
The main function of grain catcher 2 be traps diesel discharge grain amount, 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 atmosphere
Dye.
The main function of oxidation catalyzer 3 is to pass through oxygen after inlet temperature reaches its active temperature (usually 230 DEG C)
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.
Oxidation catalyzer inlet temperature sensor 10 is used for the closed-loop control of 3 inlet temperature of oxidation catalyzer, granule capturing
Device inlet temperature sensor 9, for the closed-loop control of 2 inlet temperature of grain catcher, grain catcher outlet temperature sensor 8
For the prediction to 2 internal temperature of grain catcher.
Furthermore the system further includes the i.e. ECU of electronic Control for Diesel Engine device 7(), for control engine it is normal work and
Regenerated control.
Fig. 2 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, and HC is aoxidized in oxidation catalyzer 3, improves 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. 3 is DPF entrance target temperature schematic diagram.DPF is calculated most according to engine operating condition and soot load first
The temperature allowed greatly, according to soot load calculate DPF can minimum temperature needed for initiative regeneration, then according to engine speed
DPF entrance target temperature operating condition correction factor is calculated with distributive value, finally, DPF maximum allowable temperature and DPF entrance mesh
Mark temperature case correction factor is multiplied and passes through the maximum allowable temperature of DPF and minimum allowable temperature limit obtains final DPF
Entrance target temperature.
Fig. 4 is the maximum allowable temperature computation schematic diagram of DPF entrance.The factor for influencing the maximum allowable temperature of DPF entrance is main
Including two aspects, first is that the characteristic of DOC itself, DPF inlet temperature is exhaust by DOC, and HC oxidation releases energy so that arranging
Gas lift temperature obtains, therefore looks into DOC heating maximum temperature MAP table by engine operating condition and obtain DOC heating threshold limit value；Second is that
Regenerative process DPF safety factor, DPF in the worst case occurs in regenerative process in dpf regeneration safety requirements will guarantee 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 condition
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 temperature, is judged DPF
It is whether safe, if safety, steps up regeneration temperature, until finding maximum safe regeneration temperature.DOC heating maximum limit
Value and DPF protection temperature get the small value as the maximum allowable temperature of DPF entrance.
DOC computation model is divided into n Brick.When DPF entrance target temperature determine after, DOC outlet target temperature namely
It determines.The outlet target temperature that n-th piece of DOC is DOC outlet target temperature.For one piece of DOC fragment, target temperature is calculated
When assume that no HC oxidation releases energy, it is only necessary to the energy exchange for considering itself and environment, by function of environment heat emission, so that temperature
Outlet target temperature is dropped to by entrance target temperature, therefore its outlet target temperature is worked as to a determining DOC piecemeal and has been determined,
Its entrance target temperature can be calculated.Specifically, its outlet target temperature of the n-th piecemeal of DOC is DOC outlet target
Temperature exchanges equation calculation by environmental energy and obtains the outlet target temperature of entrance target temperature namely the (n-1)th piecemeal, together
Sample, which successively calculates, can be obtained 1 outlet target temperature for arriving each piecemeal of n.After target temperature determines, start to calculate DOC heating
Required HC amount, circular is as follows, and for the DOC piecemeal of a determination, its energy mainly includes that entrance exhaust is brought into
Energy, the energy that exiting exhaust gas is taken out of, the energy of energy and the environment exchange of HC emissions and the energy of DOC matrix.For
The 1st piecemeal of DOC, entrance delivery temperature are DOC inlet temperature, and outlet temperature is the 1st piecemeal outlet target temperature of DOC, according to energy
HC amount required for the 1st piecemeal heats up can be obtained in amount conservation.The maximum HC amount that calculated result and the 1st piecemeal of DOC can convert
Get the small value the HC amount needed as the 1st piecemeal, and the 1st piecemeal outlet temperature can be calculated with the HC amount that reason is calculated,
As the 1st actual outlet target temperature of piecemeal of DOC, the 1st piecemeal realistic objective temperature being calculated, as the 2nd piecemeal enter
Mouth delivery temperature, HC amount needed for the heating of each piecemeal similarly can successively be calculated.In Fig. 5, required for n-th piece
HC amount is calculated according to following conservation of energy formula: HC heat release conversion coefficient=the n-th piece of HC amount × the n-th piece needed for n-th piece is right
The heat dissipation of environment+flow through n-th piece of energy for being vented temperature rise.So the amount of HC needed for n-th piece=min (n-th piece of maximum conversion HC
Amount, the HC heat release conversion coefficient of (energy of n-th piece of heat dissipation to environment+flow through, n-th piece of exhaust temperature rise)/n-th piece).Wherein,
N-th piece of HC heat release conversion coefficient is determined according to exhaust mass flow and n-th piece of position.N-th piece of maximum conversion HC amount, root
It is determined according to exhaust mass flow.It flows through n-th piece of exhaust temperature rise and subtracts its inlet temperature equal to its outlet target temperature.Finally, add
Required HC amount with all pieces is obtaining open loop HC needed for DOC is warming up to target temperature divided by transformation efficiency of the DOC to HC
Amount.Likewise, actual temperature is it is also possible that be calculated, according to the exhaust actual temperature and exhaust at DOC inlet inside DOC
In HC amount, the actual temperature of each piecemeal inside DOC is obtained by DOC physical model.Most always by actual temperature inside DOC and
Target temperature feeds back to obtain feedback HC amount, and feedback HC amount divided ring HC amount amendment obtains total required HC amount.
Postponement main jet can be taken in order to meet temperature requirement when dpf regeneration, measures, these measures such as spray will affect after increase
It is exported to engine torque, therefore in order to not influence driving performance, needs to compensate torque, make nominal situation and regeneration work
There is not significant change in condition torque.
The injection of the fuel oil of nominal situation and regeneration regime is all equivalent to generate oil spout when same torque at best torque point
Amount, by adjusting regeneration main jet oil mass, so that (MBT) oil mass phase at the best torque point converted under nominal situation and regeneration regime
Deng.Specific practice is to determine that the conversion of respective spray torque output is closed according to the angular relationship of time for spraying and optimal torque point
Torque and the injection of optimal torque point that system, i.e. injection unit mass oil mass generate generate the ratio of same torque oil mass, normal work
Condition each time spray be converted into optimal torque point distributive value subtract regeneration regime in addition to main jet other multi-injections convert it is optimal
Torque point distributive value, the main jet distributive value that obtained namely regenerated operating condition is postponed are converted into the distributive value of optimal torque point, then
The main jet oil mass that postponement can be obtained is closed in the distributive value conversion of main jet and optimal torque point further according to postponement.Such as Fig. 6, it is assumed that certain
Under steady state condition, the main jet oil mass under normal mode is Q_M_nrm, advance angle A1；It is increased twice after into regeneration mode
Spray afterwards: one sprays 1 after being, injection oil mass is Q_Po1_rgn, advance angle A3；Secondly 2 are sprayed after being, distributive value Q_
Po2_rgn, advance angle A4.Main jet oil mass under regeneration mode is Q_M_rgn, advance angle A2.Before making regeneration
Total torque afterwards is identical, i.e. Q_M_nrm × Fac (A1)=Q_M_rgn × Fac (A2)+Q_Po1_rgn × Fac (A3)+Q_
Po2_rgn×Fac(A4).Can be obtained by this way the main jet oil mass Q_M_rgn of the postponement under regeneration mode=(Q_M_nrm ×
Fac(A1)- Q_Po1_rgn×Fac(A3)- Q_Po2_rgn×Fac(A4))/ Fac(A2).Wherein, Fac (Ax) is in advance
The oil mass of angle Ax is transformed into the conversion coefficient of the equivalent oil mass of MBT point.
Claims (10)
- Temprature control method when 1. a kind of diesel particulate trap regenerates, it is characterized in that the control method includes following step It is rapid:Firstly, determining DPF entrance target temperature；Then, according to DPF entrance target temperature, target temperature and DOC liter inside DOC are obtained by DOC physical model calculating The required open loop HC amount of temperature；The actual temperature inside DOC and the target temperature inside DOC obtained according to DOC physical model calculating Feedback HC amount is calculated in difference between degree；Open loop HC amount and feedback HC amount are added up as total HC demand；Finally, the influence according to multi-injection to torque, is modified main jet oil mass, so that regeneration regime and nominal situation are turned round Square as close as possible to.
- Temprature control method when 2. diesel particulate trap as described in claim 1 regenerates, it is characterized in that: the DPF The determination of entrance target temperature regenerates safely permitted maximum temperature threshold and DPF regeneration institute safely firstly the need of determining DPF The minimum temperature threshold of permission；Wherein, regeneration minimum temperature threshold is obtained DPF by soot load different tests safely.
- 3. the control method of temperature when the regeneration of diesel particulate trap as described in claim 1, it is characterized in that: described The permitted max-thresholds of DPF inlet temperature calculate include DOC oxidability itself determine maximum DOC heating threshold calculations, It regenerates reliability temperature threshold under worst case to calculate, regeneration reliability temperature threshold determines that method is in selection one under worst case Deng can be regenerated with regenerated temperature, regenerative process bust to idling observation DPF internal temperature whether safety, step up Regeneration temperature, can safe regenerated maximum temperature until finding.
- Temprature control method when 4. diesel particulate trap as described in claim 1 regenerates, it is characterized in that: the DPF Inlet temperature can be corrected to obtain by the operating condition correction factor less than 1 to the permitted max-thresholds of DPF inlet temperature, so that Regeneration fuel oil consumption is minimum under each operating condition.
- Temprature control method when 5. diesel particulate trap as described in claim 1 regenerates, it is characterized in that: the DOC The foundation of physical model is the piecemeal for DOC being divided into n very little, and each piecemeal establishes a separate physical model.
- Temprature control method when 6. diesel particulate trap as described in claim 1 regenerates, it is characterized in that: the DOC Internal object temperature is each piece of downstream of n piecemeal of the DOC obtained by DOC outlet target temperature by DOC physical model calculating Target temperature.
- Temprature control method when 7. diesel particulate trap as described in claim 1 regenerates, it is characterized in that: the DOC HC amount calculation method needed for heating is to calculate each piecemeal liter according to each piecemeal entrance delivery temperature of DOC and target temperature Then the required HC amount of temperature sums it up HC oil mass needed for all piecemeals heat up and considers that DOC finally obtains DOC to the transformation efficiency of HC Feedback HC amount needed for heating.
- Temprature control method when 8. diesel particulate trap as described in claim 1 regenerates, it is characterized in that: the DOC Internal actual temperature is obtained by temperature before DOC front exhaust HC amount and DOC by DOC physical model calculating.
- Temprature control method when 9. diesel particulate trap as described in claim 1 regenerates, it is characterized in that: the feedback HC amount calculation method is that actual temperature and the difference of target temperature are obtained multiplied by feedback factor and then adduction at each piecemeal of DOC, In, feedback factor is different and different according to each piecemeal present position.
- Temprature control method when 10. diesel particulate trap as described in claim 1 regenerates, it is characterized in that: described more Influence of the secondary injection to torque, calculation method are that injection oil mass each time is converted into best torque point to generate same torque institute The oil mass needed, the best torque point oil mass for controlling regeneration regime and nominal situation conversion is equal, that is, can guarantee that torque is constant, most preferably Torque point is the fuel oil time for spraying that unit mass fuel oil does work most in the case where one determines operating condition.
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Cited By (10)
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| CN110953049A (en) * | 2019-12-17 | 2020-04-03 | 凯龙高科技股份有限公司 | Method for controlling tail pipe injection regeneration temperature of DPF of on-vehicle |
| CN112682140A (en) * | 2020-12-28 | 2021-04-20 | 潍柴动力股份有限公司 | Engine particle post-treatment device and DPF regeneration temperature control method and device thereof |
| CN112761759A (en) * | 2021-02-01 | 2021-05-07 | 联合汽车电子有限公司 | Method for controlling gasoline engine particle trap fuel cut-off regeneration based on temperature model |
| CN112963226A (en) * | 2021-03-26 | 2021-06-15 | 一汽解放汽车有限公司 | DPF active regeneration safety control method |
| CN113090370A (en) * | 2021-03-29 | 2021-07-09 | 广西玉柴机器股份有限公司 | Test method for confirming temperature of DPF balance point of non-road diesel engine |
| CN113177314A (en) * | 2021-04-28 | 2021-07-27 | 一汽解放汽车有限公司 | DPF active regeneration method and device, computer equipment and storage medium |
| CN113985942A (en) * | 2021-10-29 | 2022-01-28 | 东风商用车有限公司 | DPF regeneration temperature control system and method |
| CN114109629A (en) * | 2022-01-25 | 2022-03-01 | 潍柴动力股份有限公司 | Engine exhaust temperature control method and device and engine |
| CN114738093A (en) * | 2022-05-09 | 2022-07-12 | 一汽解放汽车有限公司 | DPF regeneration control method |
| CN114810384A (en) * | 2022-05-10 | 2022-07-29 | 潍柴动力股份有限公司 | Method and apparatus for controlling aftertreatment inlet temperature |
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| CN112761759A (en) * | 2021-02-01 | 2021-05-07 | 联合汽车电子有限公司 | Method for controlling gasoline engine particle trap fuel cut-off regeneration based on temperature model |
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| CN113090370A (en) * | 2021-03-29 | 2021-07-09 | 广西玉柴机器股份有限公司 | Test method for confirming temperature of DPF balance point of non-road diesel engine |
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| CN114810384A (en) * | 2022-05-10 | 2022-07-29 | 潍柴动力股份有限公司 | Method and apparatus for controlling aftertreatment inlet temperature |
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