CN100371569C - Diesel engine micro particle metal bag type filtering-body fuel regenerative temperature coutrol method - Google Patents
Diesel engine micro particle metal bag type filtering-body fuel regenerative temperature coutrol method Download PDFInfo
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- CN100371569C CN100371569C CNB2005101276537A CN200510127653A CN100371569C CN 100371569 C CN100371569 C CN 100371569C CN B2005101276537 A CNB2005101276537 A CN B2005101276537A CN 200510127653 A CN200510127653 A CN 200510127653A CN 100371569 C CN100371569 C CN 100371569C
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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
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The present invention relates to a control method for the fuel regenerative temperature of diesel engine micro-particle metal bag type filtering bodies, which belongs to a control method of the post treatment of diesel engine exhaust micro-particles. When an accumulative running time signal (16) of a diesel engine detected by an electronic control unit (17) reaches the calibration value, a fuel burner (13) and an air pump (14) are started, a metal bag type filtering body (8) is regenerated, a bypass valve (2) and a break valve (6) of a regenerative exhaust tube are opened during regeneration, and a flow valve (4) and a break valve (10) of an exhaust tail tube are closed. The burning fuel quantity of the fuel burner (13) and the added air quantity of the air pump (14) are adjusted and controlled by the electronic control unit (17) according to a regenerative exhaust thermoelectric couple signal (21) and a regenerative gas thermoelectric couple signal (22), and the regenerative exhaust temperature is controlled in 800 DEG C. The present invention can realize the effective control of the regenerative temperature of the metal bag type filtering body (8), and enables the regeneration of the filtering body to be safe and reliable.
Description
Technical field
The invention belongs to the diesel exhaust aftertreatment technology, particularly a kind of controlling method at diesel particulation metal bag type filtering-body fuel regeneration temperature.
Background technique
In order to satisfy the emission regulation demands of increasingly stringent, closely during the last ten years, the diesel particulates purification technics has been carried out number of research projects both at home and abroad, obtained many achievements.The content of research mainly comprises emission controls by improving combustion technology and the outer post-processing technology of machine.The outer post-processing technology of machine can reduce the diesel particulate emission amount effectively, has become one of important measures of control diesel particulate emission.
At present, the diesel particulate emission post-processing technology mainly comprises two aspects, the i.e. regeneration of the filtration of particulate and filter.From micro particle filtering, the topmost filter that adopts is the wall flow type ceramic filter at present; In recent years, because the metal filtration body has good characteristic, the metal filtration body also was applied gradually.When implementing the diesel particulate filter purification, need regularly regenerate to filter.Worked out multiple hot regeneration techniques at present both at home and abroad, as electric heating regeneration techniques, the combustion-supporting regeneration techniques of oil spout, combustion gas regeneration techniques or the like.
Hot regeneration techniques is the key technology of particulate trap, and the subject matter that hinders hot regeneration techniques practicability at present is the integrity problem in the filter regenerative process.If the filter particulate matter deposit amount is too much, the burning of particulate might scorification or hardening crack filter during regeneration, and filtration system was lost efficacy; And if the filter particulate matter deposit amount is very few, the burning of particulate might be difficult to keep and carries out when then regenerating on the one hand, also shortened the time lag of twice regeneration on the other hand, the work that has caused unnecessary energy consumption to reach diesel engine produces unnecessary influence.
In order to make filter can access reliable regeneration, generally all be the method that adopts accurate controlled filter body particulate matter deposit amount at present both at home and abroad, by monitoring filter particulate matter deposit amount, the particulate matter deposit amount of filter keeps within the specific limits when making regeneration, may also can guarantee carrying out smoothly of regenerative process to the infringement that filter causes when avoiding regenerating with this.
Yet the filter regeneration temperature is relevant with multiple factor, and except particulate matter deposit amount can influence the filter regeneration temperature, regeneration condition also can produce significant effects to the heat regeneration of filter.The hot regeneration techniques of filter lacked the effective control to regenerative process in the past, was difficult to guarantee quick, the efficient and safe and reliable regeneration of filter.
Summary of the invention
The technical problem to be solved in the present invention:
Safety reliability problem when regenerating for solving high temperature resistant poor metal filtration body heat, this invention has proposed a kind of controlling method at diesel particulation metal bag type filtering-body fuel regeneration temperature according to the structural feature of metal bag type filtering-body.This method can make the reliability of diesel particulation metal bag type filtering-body when adopting the fuel oil regeneration techniques be effectively guaranteed.
Technological scheme of the present invention:
The present invention solves the technological scheme that its technical problem adopts: in the diesel engine running, ECU (Electrical Control Unit) is determined the regeneration moment of metal bag type filtering-body according to the length of diesel engine working time.When the accumulated running time of the detected diesel engine of ECU (Electrical Control Unit), signal reached calibration value, ECU (Electrical Control Unit) is by bypass valve on the valve control signal unlatching exhaust branch pipe and the regeneration outlet pipe stop valve on the regeneration outlet pipe, close flowing valve on the outlet pipe and the tailpipe stop valve on the tailpipe, start filter regeneration fuel oil burner and air pump by burner control signal and air pump control signal simultaneously, metal bag type filtering-body is regenerated.During regeneration, diesel exhaust gas flows out through exhaust branch pipe; Regenerative combustion gas heats the particulate that is deposited in the metal bag type filtering-body through the regeneration air stream passage between metal bag type filtering-body in the filter, impels its oxidizing fire, after the outflow of regeneration outlet pipe.
In regenerative process, ECU (Electrical Control Unit) is regulated regenerative combustion gas and is added air quantity by control oil burner and air pump.When ECU (Electrical Control Unit) surpassed 730 ℃ by the detected regenerative combustion gas temperature of regenerative combustion gas thermocouple, ECU (Electrical Control Unit) reduced fuel delivery by burner control signal control oil burner; When the regenerative combustion gas temperature was lower than 680 ℃, ECU (Electrical Control Unit) increased fuel delivery by burner control signal control oil burner, thereby control is used for the regenerative combustion gas temperature of metal bag type filtering-body regeneration between 680-730 ℃.When the regenerative combustion gas temperature remained between 680-730 ℃, ECU (Electrical Control Unit) detected the regeneration delivery temperature according to regeneration well as exhaust thermocouples signal; When the regeneration delivery temperature was higher than 800 ℃, ECU (Electrical Control Unit) increased air quantity by air pump control signal control air pump; When the regeneration delivery temperature is lower than 800 ℃, then need not operate.By control, guarantee that the regeneration delivery temperature of metal bag type filtering-body is controlled at 800 ℃ with interior safety range to regeneration temperature.
In regenerative process, the regenerative combustion gas that is used for metal bag type filtering-body regeneration flows through from the outer surface of metal bag type filtering-body, the flow resistance of regenerative combustion gas can not change because of the oxidation of particulate, thereby can guarantee the constant airspeed of regenerative combustion gas in whole regenerative process.Because metal bag type filtering-body has good thermal conductivity, therefore the high-temperature fuel gas that flows through from the metal bag type filtering-body outer surface can heat the particulate that its internal surface deposits by the wall of metal bag type filtering-body, impel the particulate oxide burning, and simultaneously the heat of particle burning is taken away; The regeneration exhaust is discharged from the regeneration outlet pipe.
Beneficial effect of the present invention:
The invention has the beneficial effects as follows, realized effective control of regeneration temperature when the diesel particulation metal bag type filtering-body fuel regenerated, realize the safe and reliable regeneration of diesel particulation metal bag type filtering-body.Result of study shows, adopt this kind controlling method, can guarantee effectively the regeneration delivery temperature of metal bag type filtering-body when adopting the fuel oil regeneration techniques be controlled at 800 ℃ with interior scope in, the reliability of diesel particulation metal bag type filtering-body in regenerative process obtained effective assurance.
Description of drawings
Fig. 1 is a diesel particulation metal bag type filtering-body fuel regeneration temperature control system schematic representation.
Fig. 2 is the I-I sectional view of Fig. 1.
Fig. 3 is the II-II sectional view of Fig. 1.
Fig. 4 is the flow chart of diesel particulation metal bag type filtering-body fuel regeneration temperature controlling method.
Among the figure: 1. diesel engine, 2. bypass valve, 3. exhaust branch pipe, 4. flowing valve, 5. regeneration outlet pipe, 6. regeneration outlet pipe stop valve, 7. regeneration well as exhaust thermocouples, 8. metal bag type filtering-body, 9. tailpipe, 10. tailpipe stop valve, 11. the regenerative combustion gas thermocouple, 12. regeneration air stream pipes, 13. oil burners, 14. air pump, 15. outlet pipe, 16. accumulated running time signal, 17. ECU (Electrical Control Unit), 18. burner control signal, 19. the air pump control signal, 20. valve control signals, 21. regeneration well as exhaust thermocouples signals, 22. regenerative combustion gas thermocouple signal, 23. the diesel exhaust gas air-flow, 24. regeneration air stream passages, 25. filtration channels, 26. filter housings, 27. regeneration air streams.
Embodiment
The present invention is described further below in conjunction with accompanying drawing.
Diesel particulation metal bag type filtering-body fuel regeneration temperature control system as shown in Figure 1.Control system comprises bypass valve 2, exhaust branch pipe 3, flowing valve 4, regeneration outlet pipe 5, regeneration outlet pipe stop valve 6, regeneration well as exhaust thermocouples 7, metal bag type filtering-body 8, tailpipe 9, tailpipe stop valve 10, regenerative combustion gas thermocouple 11, regeneration air stream pipe 12, oil burner 13, air pump 14, outlet pipe 15, accumulated running time signal 16, ECU (Electrical Control Unit) 17, burner control signal 18, air pump control signal 19, valve control signal 20, regeneration well as exhaust thermocouples signal 21, regenerative combustion gas thermocouple signal 22, regeneration air stream passage 24, filtration channel 25 and filter housings 26.
A plurality of metal bag type filtering-bodies 8 that are arranged in together are housed in filter housings 26.Be evenly equipped with the hole that size and quantity equate with the opening size and the quantity of metal bag type filtering-body 8 respectively on the front end-plate in filter housings 26, the metal bag type filtering-body 8 that is arranged in together is installed on the corresponding front end plate hole.Constituted regeneration air stream passage 24 between each metal bag type filtering-body 8.The front-end and back-end of filter housings 26 are equipped with outlet pipe 15 and tailpipe 9 respectively, with the two ends of filter housings 26 front end and back end Vertical direction regeneration air stream pipe 12 and regeneration outlet pipe 5 are housed respectively.
On outlet pipe 15, draw the exhaust branch pipe 3 of a bypass atmosphere.On the outlet pipe 15 between exhaust branch pipe 3 and the filter housings 26, flowing valve 4 is housed, bypass valve 2 is housed on exhaust branch pipe 3.When metal bag type filtering-body 8 filtered work, flowing valve 4 was opened, bypass valve 2 cuts out, and diesel exhaust gas is discharged by tailpipe 9 by metal bag type filtering-body 8; During metal bag type filtering-body 8 regeneration, flowing valve 4 is closed, bypass valve 2 is opened, and diesel exhaust gas is discharged by exhaust branch pipe 3.
Tailpipe stop valve 10 and regeneration outlet pipe stop valve 6 are housed respectively on tailpipe 9 and the regeneration outlet pipe 5.When metal bag type filtering-body 8 filtered work, tailpipe stop valve 10 was opened, regeneration outlet pipe stop valve 6 is closed; Diesel exhaust gas is through outlet pipe 15, filtration channel 25, discharged by tailpipe 9 after passing the wall of metal bag type filtering-body 8.During metal bag type filtering-body 8 regeneration, the tailpipe stop valve 10 outlet pipe stop valve 6 of closing, regenerate is opened, and regeneration air stream 27 is through regeneration air stream pipe 12, regeneration air stream passage 24, discharged by regeneration outlet pipe 5 at last.
The port that is installed in regeneration air stream pipe 12 respectively according to the selected oil burner I3 of the discharge capacity of diesel engine 1 and air pump 14 and near the tube wall of regeneration air stream pipe 12 on, on the close regeneration air stream pipe 12 of metal bag type filtering-body 8, the regenerative combustion gas thermocouple 11 that is used to detect the regenerative combustion gas temperature is being installed; On regeneration outlet pipe 5, the regeneration well as exhaust thermocouples 7 that is used to detect the regeneration delivery temperature is installed near regeneration outlet pipe stop valve 6 places.
ECU (Electrical Control Unit) 17 is used to detect accumulated running time signal 16, regeneration well as exhaust thermocouples signal 21 and regenerative combustion gas thermocouple signal 22, detected signal is carried out analysis and judgement, and each valve, oil burner 13 and air pump 14 are controlled by valve control signal 20, burner control signal 18 and air pump control signal 19.
Accumulated running time signal 16 the calibration value of determining diesel engine 1 according to the kind and the operation conditions of diesel engine.The regeneration that ECU (Electrical Control Unit) 17 is determined metal bag type filtering-body 8 according to accumulated running time signal 16 the calibration value of diesel engine 1 constantly, and according to detected regenerative combustion gas thermocouple signal 22 and regeneration well as exhaust thermocouples signal 21, by burner control signal 18 and air pump control signal 19, participate in the amount of fuel and the air pump 14 added air quantities that add of burning in the control oil burner 13, control with this regeneration delivery temperature, guarantee that the regeneration delivery temperature of metal bag type filtering-body 8 is controlled at 800 ℃ with in the interior safety range metal bag type filtering-body 8.
The layout of the metal bag type filtering-body 8 of filter housings 26 inside as shown in Figures 2 and 3.Metal bag type filtering-body 8 is a bag shape, and a plurality of metal bag type filtering-bodies 8 are arranged in and are installed in together on the hole that has the front end-plate in the filter housings identical with metal bag type filtering-body 8 opening sizes 26.Have certain gas flow space between each metal bag type filtering-body 8, constituted regeneration air stream passage 24.When metal bag type filtering-body 8 filtered work, diesel exhaust gas entered metal bag type filtering-body 8 through outlet pipe 15, and the wall by metal bag type filtering-body 8 flows out then; Particulate in the exhaust is filtered by the wall of metal bag type filtering-body 8, is deposited on the internal surface of metal bag type filtering-body 8.During metal bag type filtering-body 8 regeneration, flowing valve 4 is closed, bypass valve 2 is opened, and diesel exhaust gas is discharged through exhaust branch pipe 3; And the combustion gas that is used for metal bag type filtering-body 8 regeneration is flow through from the regeneration air stream passage 24 that is constituted between the outer surface of metal bag type filtering-body 8 and the filter housings 26.Because regeneration air stream 27 flows through at the outer surface of metal bag type filtering-body 8, so flow resistance can not change because of the oxidation of particulate in regenerative process, thereby can guarantee the constant airspeed of regenerative combustion gas in whole regenerative process.Because metal bag type filtering-body 8 has good thermal conductivity, therefore the high-temperature fuel gas that flows through from metal bag type filtering-body 8 outer surfaces can heat the particulate that its internal surface deposits by the wall of metal bag type filtering-body 8, impel the particulate oxide burning, and simultaneously the heat of particle burning is taken away.Regeneration air stream 27 is discharged from regeneration outlet pipe 5 at last.
The flow process of diesel particulation metal bag type filtering-body fuel regeneration temperature controlling method as shown in Figure 4.
For practicability and the reliability requirement that satisfies system, this controlling method has been taked according to diesel engine definite regeneration working time scheme constantly.When ECU (Electrical Control Unit) 17 detected diesel engine accumulated running time signals 16 reach through setting value that demarcation provides, begin to start 14 pairs of metal bag type filtering-bodies 8 of oil burner 13 and air pump and regenerate.ECU (Electrical Control Unit) 17 is closed flowing valve 4 and tailpipe stop valve 10 by valve control signal 20, and opens bypass valve 2 and regeneration outlet pipe stop valve 6 simultaneously.During metal bag type filtering-body 8 regeneration, diesel exhaust gas is discharged through exhaust branch pipe 3; The regeneration air stream 27 that is used for metal bag type filtering-body 8 regeneration flows through from the regeneration air stream passage 24 that is constituted between the outer surface of metal bag type filtering-body 8 and the filter housings 26, after 5 discharges of regeneration outlet pipe.
In the regenerative process of metal bag type filtering-body 8, the regeneration delivery temperature that ECU (Electrical Control Unit) 17 is used for the fuel gas temperature of metal bag type filtering-body 8 regeneration by regenerative combustion gas thermocouple 11 and regeneration well as exhaust thermocouples 7 according to regenerative combustion gas thermocouple signal 22 and 21 pairs of regeneration well as exhaust thermocouples signals and flows through metal bag type filtering-body 8 is monitored.
When fuel gas temperature surpassed 730 ℃, ECU (Electrical Control Unit) 17 reduced fuel delivery by burner control signal 18 control oil burners 13; When fuel gas temperature was lower than 680 ℃, ECU (Electrical Control Unit) 17 increased fuel delivery by burner control signal 18 control oil burners 13; Thereby control is used for the regenerative combustion gas temperature of metal bag type filtering-body 8 regeneration between 680-730 ℃.
When the regenerative combustion gas temperature of metal bag type filtering-body 8 regeneration remained between 680-730 ℃, ECU (Electrical Control Unit) 17 detected according to 21 pairs of regeneration delivery temperatures that flow through metal bag type filtering-body 8 of regeneration well as exhaust thermocouples signal by regeneration well as exhaust thermocouples 7.When the regeneration delivery temperature was higher than 800 ℃, ECU (Electrical Control Unit) 17 increased air quantity by air pump control signal 19 control air pumps 14.Air pump 14 increases the reduction that air quantity will certainly cause the regenerative combustion gas temperature, therefore needs further to detect the regenerative combustion gas temperature by regenerative combustion gas thermocouple 11, whether needs to increase the fuel delivery of oil burner 13 with decision.When the regeneration delivery temperature is lower than 800 ℃, then need not operate.
Behind the lasting 10min of 17 control recovery times of ECU (Electrical Control Unit), control by ECU (Electrical Control Unit) 17, close oil burner 13 and air pump 14, and open flowing valve 4 and tailpipe stop valve 10 simultaneously, close bypass valve 2 and regeneration outlet pipe stop valve 6, the regenerative process of metal bag type filtering-body 8 finishes.
Because diesel exhaust gas is fully by exhaust branch pipe 3 bypass in the regenerative process of metal bag type filtering-body 8, and the regeneration air stream 27 that is used for metal bag type filtering-body 8 regeneration flows through from the outer surface of metal bag type filtering-body 8, therefore the flow resistance of regenerative combustion gas can not change because of the oxidation of particulate in regenerative process, thereby can guarantee the constant airspeed of regenerative combustion gas in whole regenerative process, the regenerative process of metal bag type filtering-body 8 is not subjected to the influence of the external world and particulate oxide burning.After oil burner 13 and air pump 14 regulated and finished, no longer need oil burner 13 and air pump 14 are carried out too much adjusting during metal bag type filtering-body 8 regeneration, to control system require relatively low.
Claims (1)
1. the controlling method of a diesel particulation metal bag type filtering-body fuel regeneration temperature, it is characterized in that, when ECU (Electrical Control Unit) (17) detects the accumulated running time signal (16) of diesel engine (1) when reaching calibration value, open regeneration outlet pipe stop valve (6) on the bypass valve (2) on the exhaust branch pipe (3) and the outlet pipe (5) of regenerating by valve control signal (20), close flowing valve (4) on the outlet pipe (15) and the tailpipe stop valve (10) on the tailpipe (9); Simultaneously, start filter regeneration fuel oil burner (13), start air pump (14), metal bag type filtering-body (8) is regenerated by air pump control signal (19) by burner control signal (18); In regenerative process, ECU (Electrical Control Unit) (17) is regulated the regenerative combustion gas amount by control oil burner (13), regulates adding air quantity by control air pump (14);
When surpassing 730 ℃ by the detected regenerative combustion gas temperature of regenerative combustion gas thermocouple (11), ECU (Electrical Control Unit) (17) reduces fuel delivery by burner control signal (18) control oil burner (13); When the regenerative combustion gas temperature was lower than 680 ℃, ECU (Electrical Control Unit) (17) increased fuel delivery by burner control signal (18) control oil burner (13), and control is used for the regenerative combustion gas temperature of metal bag type filtering-body (8) regeneration between 680-730 ℃;
When the regenerative combustion gas temperature remained between 680-730 ℃, ECU (Electrical Control Unit) (17) detected the regeneration delivery temperature according to regeneration well as exhaust thermocouples signal (21); When the regeneration delivery temperature was higher than 800 ℃, ECU (Electrical Control Unit) (17) increased air quantity by air pump control signal (19) control air pump (14); By control, make the regeneration delivery temperature be controlled at 800 ℃ with in the interior safety range to the regeneration delivery temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101276537A CN100371569C (en) | 2005-12-07 | 2005-12-07 | Diesel engine micro particle metal bag type filtering-body fuel regenerative temperature coutrol method |
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| CNB2005101276537A CN100371569C (en) | 2005-12-07 | 2005-12-07 | Diesel engine micro particle metal bag type filtering-body fuel regenerative temperature coutrol method |
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| CN100371569C true CN100371569C (en) | 2008-02-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7587893B2 (en) * | 2007-05-10 | 2009-09-15 | Deere & Company | Particulate filter regeneration system for an internal combustion engine |
| US8413432B2 (en) * | 2010-06-30 | 2013-04-09 | GM Global Technology Operations LLC | Particulate filter regeneration interruption systems and methods |
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|---|---|---|---|---|
| JPS5813114A (en) * | 1981-07-14 | 1983-01-25 | Nissan Motor Co Ltd | Particulate collection device of diesel engine |
| JPS60150415A (en) * | 1984-01-18 | 1985-08-08 | Mitsubishi Motors Corp | Diesel particulate filter regenerative device |
| JPH062530A (en) * | 1992-06-15 | 1994-01-11 | Toyota Motor Corp | Exhaust emission control device for internal combustion engine |
| JPH0658136A (en) * | 1992-08-06 | 1994-03-01 | Nippon Soken Inc | Exhaust gas particulate purifying device |
| JPH06137133A (en) * | 1992-10-27 | 1994-05-17 | Nippondenso Co Ltd | Exhaust emission control device for internal combustion engine |
| JPH08121146A (en) * | 1994-10-24 | 1996-05-14 | Nippondenso Co Ltd | Exhaust particulate removal device for diesel engine |
| CN1470748A (en) * | 2003-07-08 | 2004-01-28 | 北京交通大学 | Method for controlling electric heating regeneration of particle trap for diesel engine based on exhaust flow rate |
-
2005
- 2005-12-07 CN CNB2005101276537A patent/CN100371569C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5813114A (en) * | 1981-07-14 | 1983-01-25 | Nissan Motor Co Ltd | Particulate collection device of diesel engine |
| JPS60150415A (en) * | 1984-01-18 | 1985-08-08 | Mitsubishi Motors Corp | Diesel particulate filter regenerative device |
| JPH062530A (en) * | 1992-06-15 | 1994-01-11 | Toyota Motor Corp | Exhaust emission control device for internal combustion engine |
| JPH0658136A (en) * | 1992-08-06 | 1994-03-01 | Nippon Soken Inc | Exhaust gas particulate purifying device |
| JPH06137133A (en) * | 1992-10-27 | 1994-05-17 | Nippondenso Co Ltd | Exhaust emission control device for internal combustion engine |
| JPH08121146A (en) * | 1994-10-24 | 1996-05-14 | Nippondenso Co Ltd | Exhaust particulate removal device for diesel engine |
| CN1470748A (en) * | 2003-07-08 | 2004-01-28 | 北京交通大学 | Method for controlling electric heating regeneration of particle trap for diesel engine based on exhaust flow rate |
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