CN104131864A - Method of controlling a diesel particulate filter - Google Patents
Method of controlling a diesel particulate filter Download PDFInfo
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- CN104131864A CN104131864A CN201410177766.7A CN201410177766A CN104131864A CN 104131864 A CN104131864 A CN 104131864A CN 201410177766 A CN201410177766 A CN 201410177766A CN 104131864 A CN104131864 A CN 104131864A
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- Prior art keywords
- cigarette ash
- bearing capacity
- ash bearing
- model
- score value
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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
- F01N3/0238—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 for regenerating during engine standstill
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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
- F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0422—Methods of control or diagnosing measuring the elapsed time
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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
- 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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- 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
- F01N2900/1606—Particle filter loading or soot amount
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0812—Particle filter loading
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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)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Embodiments of the invention provide a method and apparatus for controlling a diesel particulate filter (282). The control is carried out with the aid of a soot loading model selected from a plurality of available soot loading models including at least one soot loading physical model which makes use of signals from an exhaust gas pressure sensor (283). A reliability score (RS) is allocated to each soot loading model such that the soot loading model with the best reliability score is used for the diesel particulate filter control. The method includes identifying a DF'F parking effect (S20) if an engine shut-off time is longer than a first time threshold (t1) and a DPF inlet temperature is lower than a first temperature threshold (T1); if a DPF parking effect is identified, then the reliability scores of all remaining (non-physical) soot loading models are changed (S22), and use of the soot loading physical model is avoided or disabled to help the control of the diesel particulate filter (282).
Description
Technical field
The disclosure relates to the method for controlling diesel particulate filter (DPF).Especially, the method relates to the identification of DPF parking effect, to avoid worsening the assessment of cigarette ash bearing capacity.
Background technique
Known present motor is provided with one or more exhaust gas post-treatment devices.After-treatment device can be any device that is configured to change exhaust components, such as be arranged in the residual hydrocarbon comprising for the exhaust of degrading (HC) of discharge pipe line and the diesel oxidation catalyst (DOC) of oxycarbide (CO) and discharge pipe line be arranged in DOC downstream for catch the diesel particulate filter (DPF) of diesel engine particulate matter (cigarette ash) from exhaust.
Especially, diesel particulate filter (DPF) is collected liquid state and the solid granulates in porous matrix structure, allows exhaust stream mistake simultaneously.In the time that it reaches its nominal storage capacity, need to be cleaned by being called the process of regeneration.DPF physical model returns to cigarette ash bearing capacity assessment, its from obtain by back pressure transducer (EGP) across the pressure difference signal reading of DPF.This is applied to total cigarette ash valuation strategy, to optimize dpf regeneration efficiency.
Between lasting vehicle lay-off period, if the cigarette ash in DPF reaches low-down temperature, the particular case relevant to the estimation of cigarette ash bearing capacity occurs.This situation is known as parking effect: its meaning is, in the time that vehicle starts again, even if the soot amount in catcher is constant, also there is the reduction of huge Pressure Drop in filter both sides, by DPF physical model, consider the information of EGP thus, cause underestimating of cigarette ash bearing capacity.
The method of controlling DPF has been shown in DE102006062515, and it attempts to consider parking effect.The method comprises measures in exhaust components (such as nitrous oxide and nitrogen dioxide in the exhaust quality stream in the downstream of particulate filter) wherein a kind of concentration.Bearing capacity condition and/or the functional conditions with the particulate filter of cigarette ash are determined from the concentration of measuring.Diagnostic signal be assigned to functional conditions and/bearing capacity condition.
A target of the present invention is to provide the method for DPF controlled, and the method is at identification Parking condition and avoid more reliable aspect the low prediction of cigarette ash bearing capacity.
This target realizes by independent claims and dependent claims thereof.
The scheme that dependent claims has been described preferably and/or had superiority especially.
Summary of the invention
Embodiment of the present disclosure provides the method for controlling diesel particulate filter, under the wherein said help that is controlled at a cigarette ash bearing capacity model in multiple available cigarette ash bearing capacity models, carry out, described cigarette ash bearing capacity model comprises at least one cigarette ash bearing capacity physical model, it utilizes the signal from back pressure transducer, wherein reliability score value is assigned to each cigarette ash bearing capacity model, and the cigarette ash bearing capacity model wherein with optimal reliability score value is used to diesel particulate filter control.The method comprises:
If the tail-off time is longer than very first time threshold value, and DPF inlet temperature is lower than the first temperature threshold, identifies DPF parking effect.This step can or be carried out before bent axle starting after a while.
If recognize parking effect because meeting above-mentioned condition, change the reliability score value of cigarette ash bearing capacity physical model or the reliability score value of all the other (non-physics) cigarette ash bearing capacity models, to avoid this cigarette ash bearing capacity physical model to be used to help the control of diesel particulate filter.In the first substitute mode, the reliability score value of cigarette ash bearing capacity physical model is changed, and makes its new reliability score value indicate it more unreliable.This score value is lowered, the reliability that lower score value instruction is reduced.In the second substitute mode, all the other the cigarette ash bearing capacity models i.e. reliability score value of all non-physics cigarette ash bearing capacity models are changed.Like this, before more reliable, particularly more reliable than cigarette ash bearing capacity physical model thereby new score value compares all the other cigarette ash bearing capacity models.In two kinds of situations (it in fact can be combined), this cigarette ash bearing capacity physical model is used to the possibility reduction that DDF controls.
Therefore, disclose a kind of for carrying out the equipment of method of controlling diesel particulate filter.This equipment comprises:
For controlling the device of diesel particulate filter, wherein this equipment is configured to be carried out and controlled by a cigarette ash bearing capacity model in multiple available cigarette ash bearing capacity models, described cigarette ash bearing capacity model comprises at least one cigarette ash bearing capacity physical model, described physical model utilization is from the signal of back pressure transducer
For reliability score value being assigned to the device of each cigarette ash bearing capacity model,
Be used to the device of diesel particulate filter control for determining to have the cigarette ash bearing capacity model of Optimal reliability score value,
If be used for, the tail-off time is longer than very first time threshold value and DPF inlet temperature is less than the first temperature threshold, identifies the device of DPF parking effect,
If for recognizing parking effect, change the reliability score value of all available cigarette ash bearing capacity models, to avoid cigarette ash bearing capacity physical model to be used to the device of the control that helps diesel particulate filter.
The advantage of this mode of execution is, defines for the needed all parameters of identification parking effect, and has set up Related Measures, between parking effector phase, does not use physics cigarette ash bearing capacity model.
According to another mode of execution, the method also comprises step: if DPF inlet temperature is longer than the second time threshold higher than the second temperature threshold and transit time, the reliability score value of the reliability score value of physical model or all the other cigarette ash bearing capacity models is returned to its value before.This contributes to allow cigarette ash bearing capacity physical model to be used to help to control diesel particulate filter.Value is before the reliability score value before detecting parking effect, and the change of the reliability score value (one or more) that therefore this step is carried out before making is invalid.
Therefore, this equipment also comprises a device, this device is used for, if DPF inlet temperature is longer than the second time threshold higher than the second temperature threshold and transit time, the reliability score value of the reliability score value of physical model or all the other cigarette ash bearing capacity models is returned to its value (one or more) before, this contributes to allow cigarette ash bearing capacity physical model to be used to help to control diesel particulate filter.
This embodiment's advantage comprises, the method can limit all parameters, determines when described parking effect should last till.
According to another embodiment, change reliability score value and undertaken by the reliability score value that reduces cigarette ash bearing capacity physical model.Again suppose the more insecure model of low score value instruction, this helps avoid cigarette ash bearing capacity physical model and have Optimal reliability score value in multiple available cigarette ash bearing capacity model.
Therefore described is to reduce the reliability score value of at least one cigarette ash bearing capacity physical model for changing the cell configuration of reliability score value, to avoid cigarette ash bearing capacity physical model to have Optimal reliability score value in multiple available cigarette ash bearing capacity models.This cigarette ash having improved in the situation that recognizing parking effect is estimated correct possibility.
According to an embodiment again, the change of reliability score value is by increasing all the other cigarette ash bearing capacity models, be the reliability score value of non-physical model and carrying out, to allow so non-physics cigarette ash bearing capacity model to there is more excellent or optimum reliability score value in multiple available cigarette ash bearing capacity models.
Therefore described is the reliability score value that increases all available cigarette ash bearing capacity models for changing the cell configuration of reliability score value, to allow non-physics cigarette ash bearing capacity model to have Optimal reliability score value in multiple available cigarette ash bearing capacity models.
In a substitute mode, or this embodiment, the advantage of bringing is that the cigarette ash bearing capacity physical model no longer in other cigarette ash bearing capacity models with Optimal reliability score value will can not be selected as the cigarette ash bearing capacity model that helps to control DPF.
According to another embodiment, multiple available cigarette ash bearing capacity models comprise cigarette ash bearing capacity statistical model, if described cigarette ash bearing capacity statistical model demonstrates the reliability score value that is better than described cigarette ash bearing capacity physical model, it is selected for the control that helps diesel particulate filter.
Therefore, described equipment also comprises the device for selecting cigarette ash bearing capacity model, wherein multiple available cigarette ash bearing capacity models comprise cigarette ash bearing capacity statistical model, if described cigarette ash bearing capacity statistical model demonstrates the reliability score value that is better than described cigarette ash bearing capacity physical model, it is selected for the control that helps diesel particulate filter.
In this way, cigarette ash bearing capacity assessment will be undertaken by model, and described model does not have the problem that cigarette ash bearing capacity is underestimated, because it has nothing to do with back pressure transducer signal, but available cigarette ash bearing capacity statistical model.
An embodiment more of the present disclosure provides a kind of automotive system, it comprises explosive motor, for example diesel engine, this explosive motor is provided with diesel particulate filter, described diesel particulate filter has back pressure transducer and electronic control unit, and described electronic control unit is configured for to be carried out according to the method for diesel particulate filter in any one of the preceding claims wherein.
According to an aspect, the method can be carried out under the help of computer program, and described computer program comprises program-code, described program-code in the time being carried out by computer for implement said method institute in steps.
This computer program can be a part for instantaneity computer program, and such as electromagnetic or optical signal, it carries binary data by modulation (such as QPSK).In substitute mode, computer program can be a part for non-transient computer program, and it realizes in traditional data medium (such as flash memory, Asic, CD or analog).Computer program can be the parts for the control gear of explosive motor, and it comprises control unit of engine (ECU), is associated with the data medium of ECU and is stored in the computer program in data medium.In this case, in the time of control gear computer program, the Overall Steps of above-described this method is performed.
Brief description of the drawings
Now will with reference to accompanying drawing, the present invention be described by way of example, wherein:
Fig. 1 illustrates automotive system.
Fig. 2 illustrates the cross section of the explosive motor of the automotive system that belongs to Fig. 1.
Fig. 3 is the schematic diagram according to after-treatment system of the present invention;
Fig. 4 represents to stop the diagram of effect.
Fig. 5 illustrates the plotted curve that causes soot levels to be underestimated due to parking effect.
Fig. 6 has shown according to according to the flow chart of method of the present invention.
Reference numerals list
S20 step
S21 step
S22 step
S23 step
S24 step
S25 step
S26 step
40 data mediums
100 automotive systems
110 explosive motors
120 engine cylinder-bodies
125 cylinders
130 cylinder heads
135 camshafts
140 pistons
145 bent axles
150 firing chambers
155 cam phasers
160 fuel injectors
170 fuel rail
180 petrolifts
190 fuel source
200 intake manifold
205 air intake ducts
210 air inlet ports
215 valves
220 ports
225 gas exhaust manifolds
230 turbosupercharger
240 compressors
245 turbo-charger shafts
250 turbo machines
260 interstage coolers
270 vent systems
275 outlet pipes
280 after-treatment devices
282 diesel particulate filters
283 back pressure transducers
290 VGT actuators
300 exhaust gas recycling systems
310 coolers for recycled exhaust gas
320 EGR valves
330 throttle valve bodys
340 quality air stream and temperature transducers
350 mainfold presure and temperature transducer
360 combustion pressure sensors
380 coolant temperatures and level sensor
385 lubricating oil temperatures and level sensor
390 metal temperature sensors
400 fuel rail pressure transducers
410 cam-position sensors
420 crankshaft position sensors
430 exhaust pressure and temperature transducer
440 EGR temperature transducers
445 accelerator position sensor
446 accelerator pedals
450?ECU
500 soot layer (high pressure drop)
501 soot layer (after parking effect, low pressure drop)
510 DPF matrix
RS reliability score value
T1 very first time threshold value
T1 the first temperature threshold
T2 the second time threshold
T2 the second temperature threshold
Embodiment
Some embodiments can comprise automotive system 100, as shown in figs. 1 and 2, described automotive system 100 comprises explosive motor (ICE) 110, it has engine cylinder-body 120, described engine cylinder-body 120 limits at least one cylinder 125, described cylinder 125 has piston 140, and described piston 140 is coupled with rotary crankshaft 145.Cylinder head 130 coordinates with piston 140, to limit firing chamber 150.
Fuel and air mixture (not shown) is arranged in firing chamber 150 and is lighted a fire, and this causes thermal expansion exhaust 140, and described thermal expansion exhaust causes the to-and-fro motion of piston.Fuel is provided by least one fuel injector 160, and air is through at least one air inlet port 210.Fuel is provided to fuel injector 160 from the fuel rail 170 being communicated with high pressure fuel pump 180 fluids under high pressure, and described high pressure fuel pump 180 increases the pressure of the fuel receiving from fuel source 190.
Each cylinder 125 has at least two valves 215, is actuated by camshaft 135, described camshaft 135 and bent axle 145 timing rotations.Valve 215 optionally allows air to enter firing chamber 150 from port 210, and alternately allows exhaust to leave by port 220.In some instances, cam phaser 155 can optionally change the timing between camshaft 135 and bent axle 145.
Air can be assigned to air inlet port (one or more) 210 by intake manifold 200.Air inlet conduit 205 can provide the air that enters intake manifold 200 from atmosphere environment.In other embodiments, throttle valve body 330 can be set, to regulate the air stream that enters manifold 200.In another other embodiments, forced induction system can be set, such as turbosupercharger 230, it has compressor 240, and described compressor 240 is connected to turbo machine 250 rotatably.The rotation of compressor 240 increases the pressure and temperature of the air in conduit 205 and manifold 200.Be arranged on the temperature that interstage cooler 260 in conduit 205 can reduce air.Turbo machine 250 rotates from the exhaust of gas exhaust manifold 225 by receiving, and described gas exhaust manifold 225 is from exhaust port 220 directing exhaust gas, and before expanding by turbo machine 250 through a series of blades.Turbo machine 250 is left in exhaust, and is directed in vent systems 270.This example illustrates variable geometry turbine (VGT), and it has VGT actuator 290, and described VGT actuator 290 is arranged as and makes blade movement to change flowing through the exhaust of turbo machine 250.In other embodiments, turbosupercharger 230 can and/or comprise wastegate for fixing geometric layout.
Vent systems 270 can comprise outlet pipe 275, and described outlet pipe 275 has one or more exhaust gas post-treatment devices 280.After-treatment device can be any device that is configured to the composition that changes exhaust.Some examples of after-treatment device 280 include but not limited to catalytic converter (binary and ternary), oxidation catalyzer, lean nitrogen oxide catcher, hydrocarbon adsorber, selective catalytic reduction (SCR) system and particulate filter 282.Especially, diesel particulate filter (or DPF) is to be exclusively used in the device of removing diesel engine particulate matter or cigarette ash from the exhaust of diesel engine.Wall-flow type diesel particulate filter is removal 85% or more cigarette ash conventionally, and can obtain under given conditions the cigarette ash eliminating rate that approaches 100%.Some filters are that single uses, once be full of the dust of accumulation, processed or replacement.Other be designed to by the use of catalyst converter passively or by active device such as fuel burner is burnt the particle of accumulation, filter is heated to soot combustion temperatures by described fuel burner; Motor is programmed for operation in the time that filter is full of and delivery temperature is improved, or produces a large amount of NOx, to be oxidized the dust of accumulation, or by other means.This is known as " filter regeneration ".
Other embodiments can comprise exhaust gas recirculatioon (EGR) system 300, and it is connected between gas exhaust manifold 225 and intake manifold 200.Egr system 300 can comprise cooler for recycled exhaust gas 310, to reduce the temperature of exhaust in egr system 300.EGR valve 320 regulates flowing of exhaust in egr system 300.
Automotive system 100 can also comprise electronic control unit (ECU) 450, described electronic control unit (ECU) 450 be associated with ICE110 and be equipped with one or more sensors and/or the device of data medium 40 to communicate by letter.ECU450 can receive the input signal from each sensor, and described sensor is configured to produce and the each physical parameter proportional signal relevant with ICE110.Sensor includes but not limited to quality air stream and temperature transducer 340, mainfold presure and temperature transducer 350, combustion pressure sensor 360, freezing mixture and oil temperature and level sensor 380, fuel rail pressure transducer 400, cam-position sensor 410, crankshaft position sensor 420, exhaust pressure and temperature transducer 430, EGR temperature transducer 440, accelerator pedal position sensor 445.In addition, ECU450 can output signal to each control gear, and described control gear is arranged as the operation of controlling ICE110, includes but not limited to fuel injector 160, throttle valve body 330, EGR valve 320, VGT actuator 290 and cam phaser 155.Note, dotted line is used for representing ECU450 communicating by letter with each sensor and between installing, but for the clear some of them of having omitted.
Turn to now ECU450, this device can comprise the digital central processing unit (CPU) of communicating by letter with Interface Bus with storage system.CPU is configured to carry out and is stored in the instruction in storage system as program, and receives signal to Interface Bus transmitted signal with from Interface Bus.Storage system can comprise various type of memory, comprises optical memory, magnetic store, solid-state memory and other nonvolatile storages.Interface Bus can be configured to send, receive and be modulated to/from simulation and/or the digital signal of each sensor and control gear.Program can realize method described herein, allows CPU to implement the step of such method and control ICE110.
Diesel particulate filter (DPF) 282 is collected liquid state and solid granulates in porous matrix structure, allows exhaust stream mistake simultaneously.In the time reaching its nominal storage capacity, it need to be clean by being called the process of regeneration, and in this regenerative process, delivery temperature is significantly increased, and is contained in thus cigarette ash in DPF burned, oxidized.DPF physical model returns to cigarette ash bearing capacity assessment, its from obtain by back pressure transducer (EGP) 283 as shown in Figure 3 across the pressure difference signal reading of DPF.Such essential information is corrected, and it has considered the Pressure Drop on DPF filter in clean conditions, and by the volume flowrate divided by exhaust, to obtain so-called " flow resistance ".Physical model cigarette ash assessment is directly related with flow resistance information, and it is returned to be given in the accurate instruction of the cigarette ash storage level of (particularly according to temperature) under different exhaust conditions, wherein EGP information inaccuracy only.Such physical model is applied to whole cigarette ash valuation strategies, to optimize dpf regeneration efficiency.
As mentioned above, the specified conditions relevant to the assessment of cigarette ash bearing capacity are called as DPF parking effect: such benefit, during long-time tail-off, (tail-off time threshold can be set up by calibrating) occurs, if and cigarette ash in DPF reaches low-down temperature (such temperature can be evaluated in DPF ingress, and DPF inlet temperature can be set up by calibrating with it).During this period, particle properties changes the remarkable reduction causing across the pressure signal of DPF assessment.This means, in the time that vehicle starts again, even if the soot amount in catcher is constant, also there is the reduction of huge Pressure Drop in filter both sides, thus by DPF physical model, consider the information of EGP283, this causes underestimating of cigarette ash bearing capacity.
In Fig. 4, schematically show so-called parking effect.In the part of top, (a), soot layer 500 is deposited in DPF matrix 510 Fig. 4.This is the normal condition before vehicle parking, for example, in the situation that has high pressure drop, because last regenerative process was carried out before for a long time; In intermediate portion, (Fig. 4 b), supposes long shut-in time and low DPF inlet temperature, and the infiltrative increase of cigarette ash causes striding across the lower Pressure Drop of filter sensing, although soot layer 501 remains unchanged; Finally, Fig. 4 c shown after stopping, and ensuing cigarette ash 500 and vehicle parking cigarette ash before has identical character: therefore Pressure Drop will increase according to cigarette ash bearing capacity, but from reduced levels, and can not consider this compensation, until regenerative process will occur.
As already mentioned, during vehicle parking, be stored in soot amount in DPF constant.But according to the character of physical model, this causes the lower decline of the pressure difference that strides across filter measurement.This is due to the fact that: increase in this period endoparticle permeability, thereby particle provides lower resistance and therefore has lower Pressure Drop in DPF both sides.The reducing of this Pressure Drop causes underestimating of physics cigarette ash model based on this.In Fig. 5, show the relation of DPF bearing capacity and coolant temperature characteristic and time.Can find out, after cold start-up, the DPF bearing capacity on apparent reduces about 28%.Once new cigarette ash is stored in DPF, the physical model of DPF bearing capacity will show the increase of bearing capacity self, but does not consider amount lost prediction.This potential substantially understate of cigarette ash physical model may cause the dpf regeneration in inappropriate work, because too high at the actual amount of the cigarette ash of regenerative process section start.
This method is from following consideration: "current" model, it estimates cigarette ash bearing capacity model, also be known as rank model, the software of assessing the reliability of different available cigarette ash bearing capacity models (for example physical model) under each drive condition, for example check the actual value of signal, as ambient air temperature, delivery temperature, exhaust mass flow, exhaust NOx concentration.In this way, in the case of the advantage and defect of known each cigarette ash model, whether software is identified current engine condition and is allowed each cigarette ash bearing capacity model to return to the reliable assessment of the cigarette ash that is hunted down.Therefore, reliability score value, it is relevant to the cigarette ash bearing capacity model that does not return to suitable valuation, is modified by calibration factor: the variation of reliability score value can be more strictly or be more not strict, depends on the inaccurate degree of cigarette ash model evaluation in each concrete condition.Like this, as the case may be, be selected and contribute to set up new cigarette ash bearing capacity information from the cigarette ash bearing capacity information of the model of optimum rank, described new cigarette ash bearing capacity information is always adopted optimum available valuation.
Some relevant parameters must be considered.First, motor does not move the transit time of (vehicle is stopped using): the length of tail-off is depended in the reduction of Pressure Drop signal.For example, under the DPF inlet temperature of-10 DEG C, after 2h, reducing of Pressure Drop is insignificant, and after 6h, such reducing is about 16%.Because of ground, require to realize this strategy for the very first time threshold value t1 (condition 1) of tail-off time.
Relevant is equally DPF inlet temperature, because parking effect only occurs when lower than specified temp.For example, in concrete engine application, for the tail-off time of about 12h, 0 DEG C locate Pressure Drop to reduce be insignificant, and locate at-25 DEG C, such reducing is about 22%.Because of ground, the first temperature threshold T1 (condition 2) for DPF inlet temperature while also requiring engine start realizes this strategy.
Once recognize parking effect according to first precondition (shut-in time, DPF inlet temperature), this strategy must be remained valid, if even if dpf temperature condition is no longer satisfied, if even because DPF inlet temperature higher than previous threshold value (condition 2) and for special time until identical temperature does not also exceed different threshold values, Pressure Drop occurs.In fact, by in the same terms (shut-in time: 12h, from control temperature :-25 DEG C) in carry out two kinds of different cold start-ups, consequently: from the time after the corresponding bent axle starting of the end of parking effect be different (for example 330s and 290s); The DPF inlet temperature corresponding from the end of parking effect is different (for example 148 DEG C and 167 DEG C); The time lag between the DPF inlet temperature of 125 DEG C and the end of parking effect is identical (for example 150s).Therefore, be required for the second temperature threshold T2 and the second time threshold t2 (condition 3) of DPF inlet temperature.When these threshold values are exceeded, can forbid this strategy, reliable because physical model can be considered to again.
In Fig. 6, show the indicative flowchart of new method.The motor causing at vehicle parking is stopped using (wherein motor " is waited for bent axle starting " in pure optional condition S20) afterwards, if the tail-off time is higher than the first alignment time threshold value t1 (condition 1, for example 6h), and DPF inlet temperature is lower than the first calibration temperature threshold value T1 (condition 2, for example-20 DEG C), this DPF parking effect of this method identification S21.
After recognizing DPF parking effect, method will change the reliability score value RS of S22 cigarette ash bearing capacity physical model and/or all the other cigarette ash bearing capacity models.For example, based on back pressure transducer 283, the reliability score value RS of all available physical models of estimating for cigarette ash bearing capacity can be lowered.Mode as an alternative, the reliability score value of all available non-physical models (for example cigarette ash bearing capacity statistical model) can be increased.In any case, for the control (carrying out the estimation of cigarette ash bearing capacity) of DPF, the model of optimum ranking will be no longer physical model, but different available model, for example statistical model or any other non-physical model, it is not based on EGP sensor signal.As is known, statistical model is the model that drive manner is associated with to average cigarette ash output.Can be defined as about driving type the driving overview (for example " city ", " suburb " or " expressway ") that model obtains, check the currency (for example gear ratio, motor and car speed, load) of some main vehicle parameters.For every kind of riving condition, the average cigarette ash discharging can be by empirical activity recognition: such information is used to set up the soot levels assessment of model subsequently.In the time of the method identification DPF parking effect, therefore, statistical model will have better rank than DPF physical model, the problem of avoiding thus cigarette ash bearing capacity to underestimate.
The method thinks that parking effect is still effective, until the condition 3 relevant to dpf temperature be not when being satisfied and not also being satisfied about the condition 3 in relevant transit time.In other words, if DPF inlet temperature is higher than S23 the second temperature threshold T2 and after this temperature conditions has been satisfied, transit time is higher than S24 the second time threshold t2, method is by the reliability score value RS value (, cigarette ash bearing capacity physical model is by the model that is again best rank) before reduction S25.In the time applying the method in practice, engine crankshaft starting can finally be performed S26, but this has exceeded scope of the present invention, and the present invention only relates to DPF and controls.
The advantage of this new method is easily understood.But, without any revising ground, after the 12h shut-in time in-25 DEG C of situations of locating cold start-up, in rank model evaluation, observe larger reduction (about-28%), owing to affecting the mistake of physical model, in the situation of detection parking effect, wherein motor still cuts out, and rank model is frozen in the last usable levels of cigarette ash bearing capacity.Motor one starts, and the method proposing here is just revised cigarette ash bearing capacity the reliability of the adjustment model score value RS, and the model of rank is considered the cigarette ash flow from other available model, for example statistical model.In DPF inlet temperature, higher than the threshold value of calibration and after having passed through the removal shake time, stopping to detect is closed.Therefore, physical model reliability score value RS gets back to initial value, and the model of rank considers that cigarette ash bearing capacity physical model is as the most reliable again: what be prevented from underestimates for about 40%.
In a word, this strategy allows the accuracy of the raising of cigarette ash bearing capacity assessment, this means the optimization of regeneration frequency, therefore avoids because cigarette ash bearing capacity is underestimated the thermal stress for parts of bringing.
Although present in the general introduction above of at least one exemplary embodiment and detailed description, should recognize and have a large amount of variants.It will be appreciated that an exemplary embodiment or multiple exemplary embodiment can be only example, and be not intended to limited field, usability or configuration by any way.More properly, aforementioned summary and detailed description will be provided for implementing the figure of road easily of at least one exemplary embodiment for those skilled in the art, should understand in the layout of the element that can describe in the exemplary embodiment and function and carry out various variations, and without prejudice to the scope described in claims and their law equivalents.
Claims (9)
1. control the method for diesel particulate filter (282) for one kind, under the wherein said help that is controlled at a cigarette ash bearing capacity model in multiple available cigarette ash bearing capacity models, carry out, described cigarette ash bearing capacity model comprises at least one cigarette ash bearing capacity physical model, it utilizes the signal from back pressure transducer (283), wherein reliability score value (RS) is assigned to each cigarette ash bearing capacity model, and the cigarette ash bearing capacity model wherein with optimal reliability score value (RS) is used to diesel particulate filter control, and the method comprises:
If the tail-off time is longer than very first time threshold value (t1), and DPF inlet temperature is less than the first temperature threshold (T1), identification (S21) DPF parking effect;
If parking effect is identified, change the reliability score value (RS) of (S22) this cigarette ash bearing capacity physical model or all the other cigarette ash bearing capacity models, to avoid this cigarette ash bearing capacity physical model to be used to help the control of diesel particulate filter (282).
2. the method for claim 1, also comprise step: if DPF inlet temperature is longer than (S24) second time threshold (t2) higher than (S23) second temperature threshold (T2) and transit time, the reliability score value of this cigarette ash bearing capacity physical model or all the other cigarette ash bearing capacity physical models is recovered to (S25) to its value before.
3. method as claimed in claim 1 or 2, wherein changing reliability score value is to be undertaken by the reliability score value (RS) of reduction (S22) described cigarette ash bearing capacity physical model.
4. method as claimed in claim 1 or 2, wherein changing reliability score value is to be undertaken by the reliability score value (RS) of increase (S22) all the other cigarette ash bearing capacity models.
5. as method in any one of the preceding claims wherein, wherein said multiple available cigarette ash bearing capacity model comprises cigarette ash bearing capacity statistical model, if it demonstrates the reliability score value (RS) of the reliability score value that is better than described cigarette ash bearing capacity physical model, it is selected for the control that helps diesel particulate filter.
6. an automotive system (100), it comprises explosive motor (110), this explosive motor is provided with diesel particulate filter (282), described diesel particulate filter has back pressure transducer (283) and electronic control unit (450), and described electronic control unit is configured for to be carried out according to the method for control diesel particulate filter in any one of the preceding claims wherein (282).
7. a computer program, it comprises computer code, described computer code is suitable for carrying out according to the method described in any one in claim 1-5 in the time being carried out by computer.
8. a computer program, computer program as claimed in claim 7 is stored thereon.
9. for a control apparatus for explosive motor, the data medium (40) that comprise control unit of engine (450), is associated with control unit of engine (450) and be stored in the computer program according to claim 7 in data medium (40).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1307754.0 | 2013-04-30 | ||
| GB1307754.0A GB2513586A (en) | 2013-04-30 | 2013-04-30 | Method of controlling a diesel particulate filter |
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| CN104131864A true CN104131864A (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410177766.7A Pending CN104131864A (en) | 2013-04-30 | 2014-04-29 | Method of controlling a diesel particulate filter |
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| Country | Link |
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| US (1) | US20140318103A1 (en) |
| CN (1) | CN104131864A (en) |
| GB (1) | GB2513586A (en) |
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| CN109072745A (en) * | 2016-04-11 | 2018-12-21 | 博世株式会社 | Filter regeneration, ECU and filter regeneration routine |
| CN112267931A (en) * | 2020-10-26 | 2021-01-26 | 浙江吉利控股集团有限公司 | Regeneration control method and regeneration control system for vehicle |
| CN112832890A (en) * | 2019-11-22 | 2021-05-25 | 珀金斯发动机有限公司 | Method for estimating soot using a radio frequency sensor |
| CN112832890B (en) * | 2019-11-22 | 2024-06-07 | 珀金斯发动机有限公司 | Method for estimating soot using a radio frequency sensor |
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| US10480792B2 (en) * | 2015-03-06 | 2019-11-19 | General Electric Company | Fuel staging in a gas turbine engine |
| JP6945297B2 (en) | 2016-12-05 | 2021-10-06 | 株式会社日立製作所 | Device diagnostic device, device diagnostic system and device diagnostic method |
| FR3085426B1 (en) * | 2018-08-30 | 2020-12-18 | Psa Automobiles Sa | PROCEDURE FOR CORRECTING AN ESTIMATED SOOT LOAD OF A PARTICULATE FILTER DURING A DROP IN ITS BACK PRESSURE |
| CN109184873B (en) * | 2018-09-29 | 2020-06-02 | 潍柴动力股份有限公司 | DPF protection method and device |
| CN113340605B (en) * | 2021-04-29 | 2023-01-24 | 广西玉柴机器股份有限公司 | Tractor whole vehicle carbon accumulation test method and system |
| CN114837782B (en) * | 2022-06-08 | 2023-10-03 | 凯龙高科技股份有限公司 | Emission reduction device of fixed source diesel engine and control method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| GB201307754D0 (en) | 2013-06-12 |
| US20140318103A1 (en) | 2014-10-30 |
| GB2513586A (en) | 2014-11-05 |
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