CN104863670A - Gasoline engine particulate matter filtering system and regeneration method - Google Patents
Gasoline engine particulate matter filtering system and regeneration method Download PDFInfo
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- CN104863670A CN104863670A CN201510305055.8A CN201510305055A CN104863670A CN 104863670 A CN104863670 A CN 104863670A CN 201510305055 A CN201510305055 A CN 201510305055A CN 104863670 A CN104863670 A CN 104863670A
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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 gasoline engine particulate matter filtering system and a regeneration method. The gasoline engine particulate matter filtering system mainly comprises a particulate matter filter (2), a three-way catalyst (1), a differential pressure transducer (4), a temperature sensor (5) and a control module. The particulate matter filter and the three-way catalyst of the filtering system are arranged in a tight coupling mode, and passive regeneration of particulate matter under most working conditions can be achieved. When it is detected that the particulate matter loading level of the particulate matter filter is too high, the control module starts active regeneration, temperature rise of exhaust gas is achieved by enabling an engine to operate in a relative-thin mixed gas working condition and postponing ignition, so that particulate matter is combusted, and the purpose of regeneration is achieved.
Description
Technical field
The present invention relates to particulate matter filtration system and regeneration method, particularly a kind of petrol engine particulate matter filtration system and regeneration method.
Background technique
Current China passenger car increases rapidly, becomes the first in the world volume of production and marketing big country for successive years.Passenger car adopts petrol engine mostly, and in order to energy-conserving and environment-protective, vehicle gasoline engine miniaturization, adopting in-cylinder direct injection to add turbosupercharging is modal technological scheme.Research shows, the granular material discharged ratio of in-cylinder direct fuel-injection engine installs the granular material discharged higher of the diesel engine of particulate filter.European Union includes laws and regulations requirement in by granular material discharged for direct spray petrol engine in cylinder in Europe five, Europe six Abgasgesetz.Granular material discharged also propose of state five standard that China has promulgated to direct spray petrol engine in cylinder is strict with, in state six emission standard being about to promulgate, likely include the discharge of the particulate matter quantity of direct spray petrol engine in cylinder in regulation first, like this, probably on direct spray petrol engine in cylinder, particulate filter is installed additional.
Along with the lengthening of operating time, the particulate matter that particulate filter is piled up gets more and more, exhaust back pressure will be increased, affect the ventilation of motor, output power is caused to reduce, oil consumption increases, and the particulate matter how on cost-effective process particulate filter is the key of particulate filter technology.Regenerated way is divided into initiative regeneration and passive regeneration.Initiative regeneration refers to utilize outside energy to improve particulate filter temperature, makes particulate matter ignition.Passive regeneration refers to more than uniform temperature, and not by outside energy, some oxide in exhaust, as NO2 and O2 etc. also can particulate matter voluntarily in oxidize particulate matter filter, thus realizes the object of particulate regeneration.Diesel engines at present particulate filter obtains to be studied widely, and regeneration method is varied, comprising: oil spout after motor, uses fuel burner, uses resistance heating coil etc.But for petrol engine, its regenerated way is different from diesel engine, because petrol engine runs under equivalent proportion of being everlasting is the operating mode of 1, the oxygen content in exhaust is low, but petrol engine row temperature is higher, is conducive to realizing passive regeneration.Research shows, under the operating mode of city, row's temperature is lower, is difficult to realize sufficient passive regeneration, still needs initiative regeneration under a stable condition.
Patent (publication number CN102373989A) discloses a kind of petrol engine particulate filter regenerated way, it adopts engine operation under rich mixture pattern, and in outlet pipe, supplement air, catalyzer is added before particulate filter, the mixed gas of overrich can continue to react the temperature raising filter wherein, thus realize particulate matter spontaneous combustion, realize regeneration, this system is higher owing to the addition of air pump loop cost.Patent (US 2013/0008162 A1) discloses a kind of petrol engine particulate filter regeneration method, the method by allow motor equivalent air fuel ratio be near 1 shake, increase delivery temperature by the reaction in ternary catalyzing unit, this regeneration method faces the problem of recovery time length.
Summary of the invention
In order to make up the deficiency in above field, the invention provides a kind of petrol engine particulate matter filtration system.
Petrol engine particulate matter filtration system provided by the present invention, mainly comprises: particulate filter (2), ternary catalyzing unit (1), differential pressure pickup (4), temperature transducer (5) and control module;
Described particulate filter (2) and ternary catalyzing unit (1) adopt close coupling to arrange; Described close coupling is arranged, is that the substrate material of the filter of particulate filter (2) and ternary catalyzing unit (1) is put into same shell;
Described differential pressure pickup (4), by detecting particulate filter (2) two ends pressure reduction, is used for determining regeneration opportunity;
The filter temperature of described temperature transducer (5) monitoring particulate filter (2), prevents from occurring thermal runaway during regeneration;
Described control module is based on flow, temperature, differential pressure information determination present granule thing load level, and operation motor carries out oil spout and igniting, promotes oxygen content and temperature in exhaust, realizes regeneration.
The ternary catalyzing unit of described particulate filter and petrol engine vent systems adopts close coupling to arrange, is conducive to improving the temperature in particulate filter, realizes the passive regeneration under most of operating mode, thus reduces the frequency of initiative regeneration.
Temperature transducer (6) is provided with in described ternary catalyzing unit (1).This temperature transducer is used for determining exhaust volume flow on the one hand, on the one hand monitoring three-element catalytic actuator temperature, the thermal runaway of ternary catalyzing unit when preventing from regenerating.
The upstream of described ternary catalyzing unit (1) is provided with lambda sensor (7), and downstream is provided with lambda sensor (3).
Present invention also offers the regeneration method of petrol engine particulate matter filtration system.
The regeneration method of petrol engine particulate matter filtration system provided by the present invention, comprising:
Determine particulate matter loading level, determine regeneration opportunity;
Control module postpones engine ignition angle, and allows motor operate in weak mixture pattern, and raising delivery temperature and wherein oxygen content, make burning particulate matter; When particulate matter loading level is reduced to predetermined value, run in the normal mode by motor, initiative regeneration stops.
Described particulate matter loads level, and by extraction flow, filter differential pressure is tabled look-up and determined.
Described regeneration method comprises further: when ternary catalyzing unit or particulate filter reach uniform temperature upon regeneration, is run in the normal mode by motor.
Described regeneration method comprises further: when initiative regeneration terminates, and when particulate filter pressure reduction is in high level, structure failure or filter aging end-of-life appear in filter.
Accompanying drawing explanation
Fig. 1 is the exhaust after treatment system comprising petrol engine particulate matter filtration system of the present invention.
Fig. 2 is the regeneration method control flow chart of petrol engine particulate matter filtration system of the present invention.
Embodiment
One provided by the invention comprises the exhaust after treatment system of petrol engine particulate filter (GPF), as shown in Figure 1.Containing conventional ternary catalyzing unit (TWC) 1 in vent systems, particulate filter 2 is installed in the downstream of ternary catalyzing unit 1, and particulate filter 2 and ternary catalyzing unit 1 are in same shell.Described particulate filter 2 adopts close coupling to arrange with ternary catalyzing unit 1; So-called close coupling is arranged, that the filter of particulate filter and the substrate material of ternary catalyzing unit are put into same shell, this is conducive to improving the temperature in particulate filter, realizes the passive regeneration under most of operating mode, thus reduces the frequency of initiative regeneration.
Be provided with temperature transducer 6 in ternary catalyzing unit 1, in particulate filter 2, be provided with temperature transducer 5.Differential pressure pickup 4 is provided with before and after particulate filter 2.Control module 12, according to current exhaust system status, is carried out associative operation to motor, is regenerated in good time.Also have spark plug 8 in Fig. 1, oil sprayer 9, electronic throttle 11, these are all the final controlling element of control module 12 when realizing Regeneration control.
For uniform-charge Otto-engine, intake flow sensor 10 being all installed, and in the upstream of ternary catalyzing unit 1, lambda sensor 7 being installed and measuring air fuel ratio, in order to diagnose ternary catalyzing unit, there is also mounted lambda sensor 3 in its downstream.By charge flow rate, air fuel ratio, delivery temperature, can calculate exhaust volume flow, and this is conducive in conjunction with pressure reduction, tables look-up and obtains particulate matter loading level.Particulate matter loads the two-dimentional form that water-glass is exhaust volume flow and filter differential pressure, produces by experiment in advance.
This exhaust system structure is conducive to the passive regeneration realizing particulate matter, and ternary catalyzing unit 1 generally adopts close coupling, utilizes high-temperature exhaust air Fast light-off.The temperature of the particulate filter 2 in its downstream is also higher, in most cases can realize particulate matter passive regeneration, thus greatly reduces the frequency of initiative regeneration, reduces difficulty and the cost of initiative regeneration.
Fig. 2 is the control flow of regeneration method disclosed by the invention.First control module detects running state (step 201), be mainly pressure reduction, charge flow rate, GPF temperature, then infer that particulate matter loads level (step 202), if need to regenerate (step 203), enter step 205, postpone engine ignition, allow motor operate in rarer operating mode; Otherwise still allow motor operate in normal mode (step 204).Temperature rise arranged by the following motor that just makes of step 205, when reaching predetermined row's temperature, during predetermined air-fuel ratio (step 206), at this moment can conclude the particulate matter spontaneous combustion in GPF, regenerating in carrying out (step 207).During regeneration, need the moment to monitor TWC and GPF temperature, prevent thermal runaway (step 208), when the two has an overtemperature, motor runs in the normal mode (step 209) by control module by force; If there is no overtemperature, continue the regeneration (step 210) of GPF.Judge particulate matter loading level (step 211) in regenerative process, when particulate matter loading level is less than predetermined value, regeneration termination, operates in normal mode (step 212) by motor; If particulate matter loading level is greater than predetermined value, then need to judge the recovery time (step 213), if be not more than predetermined value, then continue to enter step 206, continue regeneration.If the recovery time is greater than predetermined value, maximum may be have certain incombustible ash accumulation in GPF, cause the particulate matter loading level of the regeneration ending arranged too low, need to increase this value (step 214), the value (step 215) that the representative GPF preset if do not exceed after increasing is thoroughly aging, then continue to jump into step 206; Otherwise think that GPF is thoroughly aging or other catastrophe failures (step 216) occur, and be supplied to motor alarm signal, need manually to go to keep in repair GPF.
In step 205, motor operates in rarer operating mode and refers to that motor equivalent air fuel ratio is between 1-1.1, and too rare mixed gas is unfavorable for the raising of delivery temperature, and may increase hydrocarbon emission.Can realize by suitably increasing electronic throttle aperture or reducing oil spout.But when regenerating, in order to not affect vehicle power, consider that the moment of torsion that postponing lights a fire causes reduces, the air inflow of motor and fuel injection quantity all should increase, and just the ratio of air input of engine by air increase is larger.
Claims (7)
1. a petrol engine particulate matter filtration system, mainly comprises: particulate filter (2), ternary catalyzing unit (1), differential pressure pickup (4), temperature transducer (5) and control module;
Described particulate filter (2) and ternary catalyzing unit (1) adopt close coupling to arrange; Described close coupling is arranged, is that the substrate material of the filter of particulate filter (2) and ternary catalyzing unit (1) is put into same shell;
Described differential pressure pickup (4), by detecting particulate filter (2) two ends pressure reduction, is used for determining regeneration opportunity;
The filter temperature of described temperature transducer (5) monitoring particulate filter (2), prevents from occurring thermal runaway during regeneration;
Described control module is based on flow, temperature, differential pressure information determination present granule thing load level, and operation motor carries out oil spout and igniting, promotes oxygen content and temperature in exhaust, realizes regeneration.
2. petrol engine particulate matter filtration system according to claim 1, is characterized in that: be provided with temperature transducer (6) in described ternary catalyzing unit (1).
3. petrol engine particulate matter filtration system according to claim 2, is characterized in that: the upstream of described ternary catalyzing unit (1) is provided with lambda sensor (7), and downstream is provided with lambda sensor (3).
4. the regeneration method of petrol engine particulate matter filtration system, comprising:
Determine particulate matter loading level, determine regeneration opportunity;
Control module postpones engine ignition angle, and allows motor operate in weak mixture pattern, and raising delivery temperature and wherein oxygen content, make burning particulate matter; When particulate matter loading level is reduced to predetermined value, run in the normal mode by motor, initiative regeneration stops.
5. the regeneration method of petrol engine particulate matter filtration system according to claim 4, is characterized in that: described particulate matter loads level, and by extraction flow, filter differential pressure is tabled look-up and determined.
6. the regeneration method of petrol engine particulate matter filtration system according to claim 5, it is characterized in that: described regeneration method comprises further: when ternary catalyzing unit or particulate filter reach uniform temperature upon regeneration, motor is run in the normal mode.
7. the regeneration method of petrol engine particulate matter filtration system according to claim 6, it is characterized in that: described regeneration method comprises further: when initiative regeneration terminates, when particulate filter pressure reduction is in high level, there is structure failure or filter aging end-of-life in filter.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN107023365A (en) * | 2016-01-27 | 2017-08-08 | 丰田自动车株式会社 | Emission control for internal combustion engine |
| CN107084023A (en) * | 2016-02-16 | 2017-08-22 | 大众汽车有限公司 | Method and apparatus for the exhaust after-treatment of 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 |
| CN109026287A (en) * | 2017-06-08 | 2018-12-18 | 大众汽车有限公司 | Regeneration method and internal combustion engine for the particulate filter in the exhaust apparatus of internal combustion engine |
| 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 |
| CN110945219A (en) * | 2017-07-19 | 2020-03-31 | 标致雪铁龙汽车股份有限公司 | Method for initiating regeneration of a particulate filter |
| CN111749803A (en) * | 2020-05-20 | 2020-10-09 | 中国第一汽车股份有限公司 | Regeneration control method for gasoline engine particle catcher |
| CN112746907A (en) * | 2020-08-05 | 2021-05-04 | 东风汽车集团有限公司 | GPF city working condition active regeneration grading control method and system |
| CN113775396A (en) * | 2021-10-15 | 2021-12-10 | 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108915832B (en) * | 2018-06-20 | 2020-06-26 | 潍柴动力股份有限公司 | Diesel engine DPF ash removal control method |
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| US20030046929A1 (en) * | 2001-09-07 | 2003-03-13 | Mikio Terada | Exhaust emission control device of engine |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107023365B (en) * | 2016-01-27 | 2019-06-25 | 丰田自动车株式会社 | Emission control for internal combustion engine |
| CN107023365A (en) * | 2016-01-27 | 2017-08-08 | 丰田自动车株式会社 | Emission control for internal combustion engine |
| CN107084023B (en) * | 2016-02-16 | 2021-01-15 | 大众汽车有限公司 | Method and device for exhaust gas aftertreatment of an internal combustion engine |
| CN107084023A (en) * | 2016-02-16 | 2017-08-22 | 大众汽车有限公司 | Method and apparatus for the exhaust after-treatment of 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 |
| CN109026287A (en) * | 2017-06-08 | 2018-12-18 | 大众汽车有限公司 | Regeneration method and internal combustion engine for the particulate filter in the exhaust apparatus of internal combustion engine |
| CN110945219A (en) * | 2017-07-19 | 2020-03-31 | 标致雪铁龙汽车股份有限公司 | Method for initiating regeneration of a particulate filter |
| CN110945219B (en) * | 2017-07-19 | 2021-12-10 | 标致雪铁龙汽车股份有限公司 | Method for initiating regeneration of a particulate 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 |
| CN111749803A (en) * | 2020-05-20 | 2020-10-09 | 中国第一汽车股份有限公司 | Regeneration control method for gasoline engine particle catcher |
| CN112746907A (en) * | 2020-08-05 | 2021-05-04 | 东风汽车集团有限公司 | GPF city working condition active regeneration grading control method and system |
| CN113775396A (en) * | 2021-10-15 | 2021-12-10 | 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 |
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