CN104863670B - A kind of gasoline engine particulate matter filtration system and renovation process - Google Patents
A kind of gasoline engine particulate matter filtration system and renovation process Download PDFInfo
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- CN104863670B CN104863670B CN201510305055.8A CN201510305055A CN104863670B CN 104863670 B CN104863670 B CN 104863670B CN 201510305055 A CN201510305055 A CN 201510305055A CN 104863670 B CN104863670 B CN 104863670B
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- particulate matter
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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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Abstract
The invention discloses a kind of gasoline engine particulate matter filtration system and renovation process.Gasoline engine particulate matter filtration system disclosed in this invention, mainly includes：Particulate filter (2), ternary catalyzing unit (1), differential pressure pickup (4), temperature sensor (5) and control module.The particulate filter of the filtration system is arranged with ternary catalyzing unit using close coupling, can realize the passive regeneration of the particulate matter under most of operating modes.When detecting that particulate filter particulate matter loading level is excessive, control module starts initiative regeneration, mainly by allowing engine to operate in inclined lean mixture operating mode, and postpones igniting to allow exhaust-gas temperature rising, so that burning particulate matter, reaches regeneration purpose.
Description
Technical field
The present invention relates to particulate matter filtration system and renovation process, more particularly to a kind of gasoline engine particulate matter filtration system and
Renovation process.
Background technology
Current China passenger car increases rapidly, turns into the first in the world volume of production and marketing big country for successive years.Passenger car is adopted mostly
With gasoline engine, for energy-conserving and environment-protective, vehicle gasoline engine miniaturization, is most common technical side using in-cylinder direct-jet plus turbocharging
Case.Research shows, in-cylinder direct fuel-injection engine it is granular material discharged than installing the granular material discharged of the diesel engine of particulate filter
It is higher.European Union includes laws and regulations requirement by direct spray petrol engine in cylinder is granular material discharged in Europe five, the Abgasgesetz of Europe six.China is
The standard of state five of promulgation is to the granular material discharged of direct spray petrol engine in cylinder it is also proposed that strict demand, is discharged in the state six that will be promulgated
Standard, it is possible to regulation is included into the particulate matter quantity discharge of direct spray petrol engine in cylinder first, so, it is likely that in in-cylinder direct-jet
Install particulate filter on gasoline engine additional.
With the lengthening of working time, the particulate matter accumulated on particulate filter is more and more, it will the increase exhaust back of the body
Pressure, influence the ventilation of engine, cause power output to reduce, oil consumption increase, how cost-effective processing particulate filter
On particulate matter be particulate filter technology key.Regeneration is divided into initiative regeneration and passive regeneration.Initiative regeneration refers to
Particulate filter temperature is improved using outside energy, makes particulate matter ignition.Passive regeneration refers to more than certain temperature,
Not by outside energy, some oxides in exhaust, the particle that such as NO2 and O2 also can voluntarily in oxidation particle thing filter
Thing, so as to realize the purpose of particulate regeneration.Diesel engines at present particulate filter has obtained extensive research, and renovation process is more
Kind is various, including：Oil spout after engine, using fuel burner, use resistance heating coil etc..But for gasoline engine, it is again
Raw mode is different from diesel engine, and because gasoline engine is often run in the case where equivalent proportion is 1 operating mode, the oxygen content in exhaust is low, but
Gasoline engine row's temperature is higher, is advantageously implemented passive regeneration.Research shows, under the operating mode of city, row's temperature is relatively low, is difficult to realize sufficient
Passive regeneration, there is still a need for initiative regeneration in the case of certain.
Patent (publication number CN102373989A) discloses a kind of gasoline engine particulate filter regeneration, and it is using hair
Motivation is operated under rich mixture pattern, and air is supplemented in blast pipe, and catalyst, mistake are added before particulate filter
Dense gaseous mixture can continue the temperature of reaction rise filter wherein, so as to realize particulate matter spontaneous combustion, realize regeneration, the system
It is higher due to the addition of air pump circuit cost.Patent (A1 of US 2013/0008162) discloses a kind of gasoline engine particulate matter mistake
Filter regeneration method, this method is by allowing engine to be shaken near equivalent air-fuel ratio is 1, by anti-in ternary catalyzing unit
Delivery temperature should be increased, the renovation process face the recovery time it is long the problem of.
The content of the invention
In order to make up the deficiency in above field, the present invention provides a kind of gasoline engine particulate matter filtration system.
Gasoline engine particulate matter filtration system provided by the present invention, mainly includes：Particulate filter (2), three-element catalytic
Device (1), differential pressure pickup (4), temperature sensor (5) and control module；
The particulate filter (2) is arranged with ternary catalyzing unit (1) using close coupling；Close coupling arrangement, be by
The filtering body of particulate filter (2) and the base material of ternary catalyzing unit (1) are put into same shell；
The differential pressure pickup (4) is by detecting particulate filter (2) both ends pressure difference, for determining regeneration opportunity；
The filtering temperature of temperature sensor (5) the monitoring particulate filter (2), prevent that heat occur during regeneration loses
Control；
The control module is based on flow, temperature, differential pressure information and determines present granule thing load level, and operation engine enters
Row oil spout and igniting, oxygen content and temperature in lifting exhaust, realize regeneration.
The particulate filter and the ternary catalyzing unit of gasoline engine gas extraction system are arranged using close coupling, are advantageous to improve
Temperature in particulate filter, the passive regeneration under most of operating modes is realized, so as to reduce the frequency of initiative regeneration.
Temperature sensor (6) is provided with the ternary catalyzing unit (1).On the one hand the temperature sensor is used for determining to be vented
Volume flow, ternary catalyzing unit temperature is on the one hand monitored, the thermal runaway of ternary catalyzing unit when preventing from regenerating.
The upstream installation oxygen sensor (7) of the ternary catalyzing unit (1), downstream installation oxygen sensor (3).
Present invention also offers the renovation process of gasoline engine particulate matter filtration system.
The renovation process of gasoline engine particulate matter filtration system provided by the present invention, including：
Particulate matter loading level is determined, determines regeneration opportunity；
Control module postpones engine ignition angle, and allows engine to operate in lean mixture pattern, improve delivery temperature and
Wherein oxygen content, make burning particulate matter；When particulate matter loading level is reduced to predetermined value, engine is operated in into normal mode
Under, initiative regeneration terminates.
The particulate matter loading level, by extraction flow, filter differential pressure is tabled look-up determination.
The renovation process further comprises：Ternary catalyzing unit or particulate filter reach certain temperature upon regeneration
When, by engine operation in the normal mode.
The renovation process further comprises：When initiative regeneration terminates, and particulate filter pressure difference is in high-level, mistake
There is structure failure or filter aging end-of-life in filter.
Brief description of the drawings
Fig. 1 is the exhaust after treatment system for including gasoline engine particulate matter filtration system of the present invention.
Fig. 2 is the renovation process control flow chart of gasoline engine particulate matter filtration system of the present invention.
Embodiment
One kind provided by the invention includes the exhaust after treatment system of gasoline engine particulate filter (GPF), such as Fig. 1 institutes
Show.Contain conventional ternary catalyzing unit (TWC) 1, the downstream installation particulate filter 2 of ternary catalyzing unit 1, particle in gas extraction system
Thing filter 2 is in same shell with ternary catalyzing unit 1.The particulate filter 2 uses close coupling with ternary catalyzing unit 1
Arrangement；So-called close coupling arrangement, is that the base material of the filtering body of particulate filter and ternary catalyzing unit is put into outside same
In shell, this is advantageous to improve the temperature in particulate filter, the passive regeneration under most of operating modes is realized, so as to reduce master
The frequency of dynamic regeneration.
Temperature sensor 6 is provided with ternary catalyzing unit 1, temperature sensor 5 is provided with particulate filter 2.Particle
Differential pressure pickup 4 is provided with before and after thing filter 2.Control module 12 carries out phase according to current exhaust system status to engine
Operation is closed, is regenerated in good time.There is spark plug 8 in Fig. 1, fuel injector 9, electronic throttle 11, these are all control modules 12
Actuator when realizing Regeneration control.
For uniform-charge Otto-engine, intake flow sensor 10 is mounted on, and be provided with the upstream of ternary catalyzing unit 1
Lambda sensor 7 measures air-fuel ratio, in order to diagnose ternary catalyzing unit, there is also mounted lambda sensor 3 downstream.Pass through inlet air flow
Amount, air-fuel ratio, delivery temperature, can calculate exhaust volumetric flow, and this is advantageous to combine pressure difference, table look-up to obtain particulate matter loading water
It is flat.Particulate matter loading level table is the two-dimensional table of exhaust volumetric flow and filter differential pressure, is produced in advance by experiment.
The exhaust system structure is advantageously implemented the passive regeneration of particulate matter, and ternary catalyzing unit 1 typically uses close coupling, profit
With high-temperature exhaust air Fast light-off.The temperature of particulate filter 2 downstream is also higher, can in most cases realize particulate matter
Passive regeneration, so as to greatly reduce the frequency of initiative regeneration, reduce the difficulty and cost of initiative regeneration.
Fig. 2 is the control flow of renovation process disclosed by the invention.Control module detects running status (step first
201), predominantly pressure difference, charge flow rate, GPF temperature, particulate matter loading level (step 202) is then inferred, if necessary to regenerate
(step 203), into step 205, engine ignition is postponed, allows engine to operate in compared with lean condition；Otherwise engine is still allowed
Operate in normal mode (step 204).Next step 205 just makes engine row's temperature rise behind whirlpool, when reaching predetermined row's temperature, make a reservation for sky
Combustion than when (step 206), at this moment can be concluded that the particulate matter spontaneous combustion in GPF, (step 207) during regeneration is carried out.During regeneration, it is necessary to
Moment monitors TWC and GPF temperature, prevents thermal runaway (step 208), and when the two has an overtemperature, control module by force will hair
Motivation runs (step 209) in the normal mode；If without overtemperature, continue GPF regeneration (step 210).In regenerative process
Judge particulate matter loading level (step 211), when particulate matter loading level is less than predetermined value, regeneration termination, engine is transported
Row is in normal mode (step 212)；If particulate matter loading level is more than predetermined value, need to judge recovery time (step 213),
If being not more than predetermined value, step 206 is gone successively to, continues to regenerate.If the recovery time is more than predetermined value, maximum is probably
There is certain incombustible ash accumulation in GPF, cause the particulate matter loading level of the regeneration ending of setting too low, it is necessary to increase
Big value (the step 214), if being not above the value (step 215) set in advance for representing the thorough agings of GPF after increase, continues
Jump into step 206；Otherwise it is assumed that the thorough agings of GPF or other catastrophe failure (steps 216) occur, and it is supplied to engine report
Alert signal is, it is necessary to manually go to repair GPF.
Engine operates in step 205 refers to engine equivalent air-fuel ratio between 1-1.1 compared with lean condition, too dilute mixing
Gas is unfavorable for the raising of delivery temperature, and may increase hydrocarbon emission.Can by suitably increase electronic throttle aperture or
Person reduces oil spout to realize.But when regenerating, in order to not influence vehicle power, it is contemplated that postponing moment of torsion caused by igniting reduces, hair
The air inflow and distributive value of motivation should all increase, and simply the increased ratio of air input of engine by air is bigger.
Claims (5)
1. the renovation process of gasoline engine particulate matter filtration system, including：
A) loading level of particulate matter is determined：
1. by charge flow rate, air-fuel ratio and delivery temperature calculate exhaust volumetric flow, measure the side pressure of particulate filter (2) two
Difference；The charge flow rate is measured by intake flow sensor (10), and the air-fuel ratio is by being arranged on ternary catalyzing unit (1) upstream
Lambda sensor (7) is measured, and the delivery temperature is measured by the temperature sensor (6) being arranged in ternary catalyzing unit (1)；Described
Grain thing filter (2) both ends pressure difference is measured by differential pressure pickup (4)；
2. looking into particulate matter loading level table, particulate matter loading level is obtained；The particulate matter loading level table is exhaust volume
The bivariate table of flow and particulate filter (2) both ends pressure difference；
B) predetermined value of comparative particle's thing loading level, determines regeneration opportunity；The loading level of the particulate matter is more than described pre-
Definite value, regeneration start；
C) regenerative process：
Control module postpones gasoline engine ignition angle, and allows gasoline engine to operate in lean mixture pattern, improves delivery temperature and wherein
Oxygen content, make burning particulate matter；When particulate matter loading level is less than predetermined value by gasoline engine operation in the normal mode, actively
Regeneration termination.
2. the renovation process of gasoline engine particulate matter filtration system according to claim 1, it is characterised in that：Regenerative process is also
Comprise the following steps：Particulate matter loading level remains above predetermined value after initiative regeneration, just compares recovery time predetermined value, when
Less than recovery time predetermined value, continue to regenerate；More than recovery time predetermined value, particulate matter loading level predetermined value is just heightened, after
Continuous regeneration.
3. the renovation process of gasoline engine particulate matter filtration system according to claim 2, it is characterised in that：Regenerative process is also
Comprise the following steps：When the particulate matter loading level predetermined value heightened exceedes particulate filter aging value, particulate matter is considered as
Filter aging or failure.
4. the renovation process of gasoline engine particulate matter filtration system according to claim 1 or 2, it is characterised in that：It is described again
Generation method further comprises：Particulate filter is monitored with the internal temperature sensor (5) of particulate filter (2) is arranged on
(2) filtering temperature, ternary catalyzing unit (1) interior temperature is monitored with the temperature sensor (6), prevents that heat occur during regeneration loses
Control, when ternary catalyzing unit (1) or particulate filter (2) reach certain temperature upon regeneration, gasoline engine is operated in normally
Under pattern.
5. the renovation process of gasoline engine particulate matter filtration system according to claim 1 or 2, it is characterised in that：The control
Molding block postpones gasoline engine ignition angle, and gasoline engine operates in lean mixture pattern, and now air-fuel ratio is in 1-1:Between 1.
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| CN201510305055.8A CN104863670B (en) | 2015-06-05 | 2015-06-05 | A kind of gasoline engine particulate matter filtration system and renovation process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108915832A (en) * | 2018-06-20 | 2018-11-30 | 潍柴动力股份有限公司 | Diesel engine DPF dust cleaning control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6311731B2 (en) * | 2016-01-27 | 2018-04-18 | トヨタ自動車株式会社 | Exhaust gas purification device for internal combustion engine |
| DE102016202349A1 (en) * | 2016-02-16 | 2017-08-17 | Volkswagen Aktiengesellschaft | Method and device for exhaust aftertreatment of an internal combustion engine |
| CN108952894A (en) * | 2017-05-17 | 2018-12-07 | 上汽通用汽车有限公司 | A kind of regenerated device and method controlling particulate matter trap |
| CN107013292A (en) * | 2017-05-26 | 2017-08-04 | 凯龙高科技股份有限公司 | DPF initiative regeneration control systems based on heat management in machine and blast pipe oil spout |
| DE102017209693A1 (en) * | 2017-06-08 | 2018-12-13 | Volkswagen Aktiengesellschaft | Method for regenerating a particle filter in the exhaust system of an internal combustion engine and internal combustion engine |
| FR3069279B1 (en) * | 2017-07-19 | 2019-08-02 | Psa Automobiles Sa | METHOD FOR STARTING A REGENERATION OF A PARTICLE FILTER |
| CN109505705A (en) * | 2018-12-21 | 2019-03-22 | 东风汽车集团有限公司 | A kind of gasoline engine grain catcher DECEL ENLEAN regeneration hierarchical control method and control system |
| CN111749803B (en) * | 2020-05-20 | 2022-10-14 | 中国第一汽车股份有限公司 | Regeneration control method for gasoline engine particle catcher |
| CN112746907B (en) * | 2020-08-05 | 2021-12-24 | 东风汽车集团有限公司 | GPF city working condition active regeneration grading control method and system |
| CN113775396B (en) * | 2021-10-15 | 2022-09-16 | 无锡威孚力达催化净化器有限责任公司 | Control method, control device and control system for removing PM in DPF |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100504422B1 (en) * | 2001-09-07 | 2005-07-29 | 미쓰비시 지도샤 고교(주) | Exhaust emission control device for engine |
| JP4288985B2 (en) * | 2003-03-31 | 2009-07-01 | 株式会社デンソー | Exhaust gas purification device for internal combustion engine |
| CN103511043B (en) * | 2013-09-22 | 2015-10-07 | 潍柴动力股份有限公司 | A kind of active regeneration control method of particulate matter trap and device |
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| CN108915832A (en) * | 2018-06-20 | 2018-11-30 | 潍柴动力股份有限公司 | Diesel engine DPF dust cleaning control method |
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