CN103850763A - Automobile exhaust repurification system and purification method of automobile exhaust repurification system - Google Patents
Automobile exhaust repurification system and purification method of automobile exhaust repurification system Download PDFInfo
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- CN103850763A CN103850763A CN201410095019.9A CN201410095019A CN103850763A CN 103850763 A CN103850763 A CN 103850763A CN 201410095019 A CN201410095019 A CN 201410095019A CN 103850763 A CN103850763 A CN 103850763A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000000746 purification Methods 0.000 title claims abstract description 12
- 230000003197 catalytic effect Effects 0.000 claims abstract description 53
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 38
- 238000004140 cleaning Methods 0.000 claims description 21
- 230000009466 transformation Effects 0.000 claims description 11
- 239000002912 waste gas Substances 0.000 claims description 10
- 238000006555 catalytic reaction Methods 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000000243 solution Substances 0.000 description 4
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses an automobile exhaust repurification system and a purification method of the automobile exhaust repurification system. The exhaust repurification system is added on the basis of the traditional automobile exhaust system, and comprises two one-way control valves, an air pump (9) and a tail gas storage tank (10). Partial exhaust tail gas generated by an automobile in the cold starting stage is stored and collected after being compressed, after the exhaust temperature of an engine is raised, the catalyst conversion efficiency is stabilized at a very high level, then, the collected and stored exhaust tail gas is gradually released, and the partial tail gas is catalyzed and converted through a catalytic converter again, so the problem of high emission of the automobile in the cold starting stage is solved.
Description
Technical field
The invention belongs to Vehicle Emission Control field, relate in particular to a kind of automobile exhaust cleaning system and purification method thereof again.
Background technique
Ternary catalyzing unit, as the exhaust gas cleaner generally using at present, is mainly that employing catalyzer is that harmless gas is discharged by harmful gas conversions such as CO, HC, NOx in exhaust.
In order to reduce the discharge of cold-start phase, make car load reach the requirement of emission limit, some catalyzer Fast light-off technology have produced and have been applied.They can divide two classes: (1) is by braking technique: change vent systems design (as make catalytic converter near motor, use front stage catalyst and HC trap) to reduce cold start emission.(2) active technique: when cold starting, carry out elevated exhaust temperature (as electric heating catalyzer, burner and air injection reaction etc.) with extra controlled energy and make catalyzer Fast light-off.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem: in braking technique, being made catalytic converter sum up near the scheme of motor, use front stage catalyst is all as far as possible close with exhaust outlet by arranging catalyst converter in fact, can heat to reach fast in the short period of time the temperature of ignition to catalyzer by delivery temperature.But the effect of this scheme is still very limited, along with discharge upgrading, catalyst converter carrier is by increasing, and thermal inertia strengthens, and it will be more and more slower that bed temperature rises.HC trap scheme is that the HC that cold-start phase is produced imports a bypass duct by an outlet valve by exhaust, flow in HC trap, adsorb with the sorbent such as active carbon or zeolite molecular sieve, when after temperature rise, zeolite can automatic desorption HC, it after carrying out catalytic reaction, catalyst converter is discharged again, to reach the object that reduces cold-start phase discharge.But this scheme can only be processed HC, simultaneously temperature when HC desorption is not high yet, and at this temperature, the transformation efficiency of catalyzer not yet can be stabilized in a higher level, so catalytic effect is limited.The system architecture of above-mentioned active technique scheme is relatively complicated, and system need to fill valve and the sensor of a large amount of microprocessor controls, implements difficulty relatively large, and cost also can be very high.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of automobile exhaust cleaning system and purification method thereof again that effectively reduces automobile exhaust discharge.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of automobile exhaust cleaning system again, comprise the gas exhaust manifold being connected successively by connecting pipeline, pre-catalytic converter assembly, bellows, main catalytic device assembly, premuffler assembly and rear muffler assembly, it is characterized in that, also comprise one-way control valve I, air pump, tail gas storage tank and one-way control valve II, on the connecting pipeline of described one-way control valve Ⅰ An Installed before premuffler assembly; Described tail gas storage tank one end is connected on the connecting pipeline before one-way control valve I by air pump, and the other end is connected on the connecting pipeline before main catalytic device assembly by one-way control valve II.
Described one-way control valve I, air pump and one-way control valve II are connected on car load ECU by wire harness.
Described one-way control valve I is between main catalytic device assembly and premuffler assembly.
The access point of described air pump is between main catalytic device assembly and one-way control valve I.
The access point of described one-way control valve II is between bellows and main catalytic device assembly.
Automobile exhaust is a purification method for cleaning system again, comprises the following steps:
1) automobile cold start starts, and controls one-way control valve I and one-way control valve II is closed, air pump is opened by ECU, after the waste gas that motor is discharged is compressed by air pump, enters in tail gas storage tank and stores;
2) after automobile cold start t1s, catalyst temperature raises, catalytic efficiency improves, can well the harmful matter in waste gas be carried out to catalysis, controlling the unlatching of one-way control valve I, one-way control valve II and air pump by ECU closes, waste gas discharged by gas exhaust manifold after after pre-catalytic converter assembly, main catalytic device assembly catalyzed conversion, then be discharged in atmosphere after premuffler assembly, rear muffler assembly;
3) after automobile cold start t2s, catalyzer transformation efficiency is stabilized to a high level after rising, control one-way control valve I and the unlatching of one-way control valve II by ECU, air pump cuts out, the compressed exhaust gas in cold-start phase collection storage in tail gas storage tank is discharged in outlet pipe gradually by one-way control valve II, and then purify by main catalytic device assembly, by being discharged in atmosphere after one-way control valve I, premuffler assembly and rear muffler assembly.
Described time t1 is the time that engine air-fuel ratio enters closed loop control, is demarcated and is determined by real vehicle according to emissions requirements, engine operational conditions, system matches.
Described time t2 is the time of delivery temperature needed temperature when reaching catalytic efficiency and being stabilized in high level.
When the catalytic efficiency of main catalytic device assembly is stabilized in high level, needed delivery temperature is 300-400 DEG C.
In described main catalytic device assembly, be provided with temperature transducer, described temperature transducer is connected with ECU.
A technological scheme tool in technique scheme has the following advantages or beneficial effect, use exhaust cleaning system again, the partial discharge tail gas that the automobile cold start stage is produced first compresses rear storage collection, the delivery temperature for the treatment of motor rises, catalyzer transformation efficiency is stabilized in after a high level, again the emission of collecting storage is discharged gradually, make this part tail gas again carry out catalyzed conversion by catalyst converter, thereby the solution automobile cold start stage is discharged high problem, to reach the object that effectively reduces automobile exhaust discharge.
Brief description of the drawings
The automobile exhaust again structural representation of cleaning system of Fig. 1 for providing in the embodiment of the present invention;
Mark in above-mentioned figure is: 1, gas exhaust manifold, 2, connecting pipeline, 3, pre-catalytic converter assembly, 4, bellows, 5, main catalytic device assembly, 6, premuffler assembly, 7, rear muffler assembly, 8, one-way control valve I, 9, air pump, 10, tail gas storage tank, 11, one-way control valve II, 12, ECU, 13, wire harness.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Ternary catalyzing unit the catalytic conversion efficiency discharging pollutants is mainly subject to the impact of temperature, the initiation temperature of three-way catalyst is 300-400 DEG C of left and right, be that temperature in catalyzer is will reach 300-400 DEG C of left and right time, could there is higher transformation efficiency to the CO in exhaust, HC, NOx, otherwise three-way catalyst is lower to the transformation efficiency of CO, HC, NOx in automobile exhaust, not treatable harmful gas can directly discharge in atmosphere, causes pollution of atmosphere.
In emission test, automobilism NEDC circulation, just can reach 300-400 DEG C of left and right when automobile cold start final vacuum temperature generally needs 40-50s; So before this, catalyst transformation efficiency is low, and the harmful gas in automobile exhaust fails to be well catalytically converted into harmless gas; Add that cold-start phase mixed gas is partially dense, CO and HC that burning produces discharge pollutants often, thereby cause the CO and the HC that in the 40-50s time after emission test cold starting, discharge to account for about the half in whole emission test stage.
Embodiment one
Referring to Fig. 1, the present embodiment provides a kind of automobile exhaust cleaning system again, comprise the gas exhaust manifold 1 being connected successively by connecting pipeline 2, pre-catalytic converter assembly 3, bellows 4, main catalytic device assembly 5, premuffler assembly 6 and rear muffler assembly 7, also comprise one-way control valve I 8, air pump 9, tail gas storage tank 10 and one-way control valve II 11, on the connecting pipeline 2 of one-way control valve I 8 An Installed before premuffler assembly 6; Tail gas storage tank 10 one end are connected on the connecting pipeline 2 before one-way control valve I 8 by air pump 9, and the other end is connected on the connecting pipeline 2 before main catalytic device assembly 5 by one-way control valve II 11.
One-way control valve I 8, air pump 9 and one-way control valve II 11 are connected on car load ECU12 by wire harness 13.
One-way control valve I 8 is between main catalytic device assembly 5 and premuffler assembly 6.
The access point of air pump 9 is between main catalytic device assembly 5 and one-way control valve I 8.
The access point of one-way control valve II 11 is between bellows 4 and main catalytic device assembly 5.
Embodiment two
The present embodiment provides a kind of automobile exhaust purification method of cleaning system again, comprises the following steps:
1 automobile cold start starts, and because catalyst temperature is low, does not reach initiation temperature, and catalyzer is low to the transformation efficiency of combustion gas.Control one-way control valve I 8 and one-way control valve II 11 is closed, air pump 9 is opened by ECU12, the waste gas that motor is discharged is discharged in atmosphere after can be by premuffler assembly 6 and rear muffler assembly 7 after in advance catalytic converter assembly 3, main catalytic device assembly 5 catalytic reactions after being discharged by gas exhaust manifold 1, but it is entered in tail gas storage tank 10 after this part tail gas being compressed by air pump 9, tail gas is temporarily stored.Air pump 9 used must mate and demarcate according to motor, can ensure that motor is can exhaust smooth and easy in this stage, is unlikely to cause because exhaust resistance is excessive engine operation to worsen and even quits work;
After 2 automobile cold start t1s, catalyst temperature raises, catalytic efficiency improves, can well the harmful matter in waste gas be carried out to catalysis, by ECU12 control that one-way control valve I 8 is opened, one-way control valve II 11 and air pump 9 close, waste gas discharged by gas exhaust manifold 1 after after pre-catalytic converter assembly 3, main catalytic device assembly 5 catalyzed conversions, then be discharged in atmosphere after premuffler assembly 6, rear muffler assembly 7;
After 3 automobile cold start t2s, catalyzer transformation efficiency is stabilized to a high level after rising, control one-way control valve I 8 and one-way control valve II 11 is opened by ECU12, air pump 9 cuts out, the compressed exhaust gas in cold-start phase collection storage in tail gas storage tank 10 is discharged in outlet pipe gradually by one-way control valve II 11, and then purify by main catalytic device assembly 5, because the transformation efficiency of main catalytic converter assembly is now stabilized in a high level, so this part tail gas can be purified effectively again, by main catalytic device assembly 5 again the waste gas of catalyzed conversion be discharged in atmosphere after premuffler assembly 6 and rear muffler assembly 7 by one-way control valve I 8.
Time t1 is the time that engine air-fuel ratio enters closed loop control, is demarcated and is determined by real vehicle according to emissions requirements, engine operational conditions, system matches.In emission test, vehicle operating NEDC circulation, a big chunk exhaust contaminant of cold-start phase results from first idling, acceleration of first ECE circulation, at the uniform velocity and in decelerating mode, the whole operating mode time is 28s, and engine air-fuel ratio enters the time of closed loop control in 30s left and right, so t1 switching time of the above-mentioned operating mode of cleaning system is set to 30s again.
Time t2 is the time of delivery temperature needed temperature when reaching catalytic efficiency and being stabilized in high level.
When the catalytic efficiency of main catalytic device assembly 5 is stabilized in high level, needed temperature is 300-400 DEG C.When generally needing 40-50s, automobile cold start final vacuum temperature just can reach 300-400 DEG C of left and right, so t2 is set to 50s.
In main catalytic device assembly 5, be provided with temperature transducer, temperature transducer is connected with ECU12, detects delivery temperature by temperature transducer, in the time that delivery temperature reaches requirement, is controlled and is started above-mentioned the 3rd step by ECU12.
Adopt after above-mentioned scheme, use exhaust cleaning system again, the partial discharge tail gas that the automobile cold start stage is produced first compresses rear storage collection, the delivery temperature for the treatment of motor rises, catalyzer transformation efficiency is stabilized in after a high level, then the emission of collecting storage is discharged gradually, makes this part tail gas again carry out catalyzed conversion by catalyst converter, thereby the solution automobile cold start stage is discharged high problem, reach the object that effectively reduces automobile exhaust discharge.
By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technological scheme carry out; or without improving, design of the present invention and technological scheme are directly applied to other occasion, all within protection scope of the present invention.
Claims (10)
1. automobile exhaust cleaning system again, comprise the gas exhaust manifold (1) being connected successively by connecting pipeline (2), pre-catalytic converter assembly (3), bellows (4), main catalytic device assembly (5), premuffler assembly (6) and rear muffler assembly (7), it is characterized in that, also comprise one-way control valve I (8), air pump (9), tail gas storage tank (10) and one-way control valve II (11), (8) An Installed are on the front connecting pipeline (2) of premuffler assembly (6) for described one-way control valve I; It is upper that described tail gas storage tank (10) one end is connected to the front connecting pipeline (2) of one-way control valve I (8) by air pump (9), and the other end is connected on the front connecting pipeline (2) of main catalytic device assembly (5) by one-way control valve II (11).
2. automobile exhaust as claimed in claim 1 cleaning system again, is characterized in that, described one-way control valve I (8), air pump (9) and one-way control valve II (11) are connected to car load ECU(12 by wire harness (13)) on.
3. automobile exhaust as claimed in claim 1 or 2 cleaning system again, is characterized in that, described one-way control valve I (8) is positioned between main catalytic device assembly (5) and premuffler assembly (6).
4. automobile exhaust as claimed in claim 3 cleaning system again, is characterized in that, the access point of described air pump (9) is positioned between main catalytic device assembly (5) and one-way control valve I (8).
5. automobile exhaust as claimed in claim 4 cleaning system again, is characterized in that, the access point of described one-way control valve II (11) is positioned between bellows (4) and main catalytic device assembly (5).
6. the automobile exhaust purification method for cleaning system again as described in as arbitrary in claim 1～5, is characterized in that, comprises the following steps:
1) automobile cold start starts, pass through ECU(12) control one-way control valve I (8) and one-way control valve II (11) is closed, air pump (9) is opened, after being compressed by air pump (9), the waste gas that motor is discharged enters storage in tail gas storage tank (10);
2) after automobile cold start t1s, catalyst temperature raises, catalytic efficiency improves, can well the harmful matter in waste gas be carried out to catalysis, pass through ECU(12) control that one-way control valve I (8) is opened, one-way control valve II (11) and air pump (9) are closed, waste gas discharged by gas exhaust manifold (1) after after in advance catalytic converter assembly (3), main catalytic device assembly (5) catalyzed conversion, then be discharged in atmosphere after (7) through premuffler assembly (6), rear muffler assembly;
3) after automobile cold start t2s, catalyzer transformation efficiency is stabilized to a high level after rising, pass through ECU(12) control one-way control valve I (8) and one-way control valve II (11) unlatching, air pump (9) cuts out, the compressed exhaust gas in cold-start phase collection storage in tail gas storage tank (10) is discharged in outlet pipe gradually by one-way control valve II (11), and then purify by main catalytic device assembly (5), by being discharged in atmosphere after one-way control valve I (8), premuffler assembly (6) and rear muffler assembly (7).
7. the automobile exhaust as claimed in claim 6 purification method of cleaning system again, it is characterized in that, described time t1 is the time that engine air-fuel ratio enters closed loop control, is demarcated and is determined by real vehicle according to emissions requirements, engine operational conditions, system matches.
8. the automobile exhaust as claimed in claim 6 purification method of cleaning system again, is characterized in that, described time t2 is the time of delivery temperature needed temperature when reaching catalytic efficiency and being stabilized in high level.
9. the automobile exhaust as claimed in claim 8 purification method of cleaning system again, is characterized in that, when the catalytic efficiency of main catalytic device assembly (5) is stabilized in high level, needed delivery temperature is 300-400 DEG C.
10. the automobile exhaust as claimed in claim 9 purification method of cleaning system again, is characterized in that, is provided with temperature transducer, described temperature transducer and ECU(12 in described main catalytic device assembly (5)) be connected.
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| CN201410095019.9A CN103850763B (en) | 2014-03-14 | 2014-03-14 | A kind of automobile exhaust cleaning system and purification method thereof again |
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| CN201410095019.9A CN103850763B (en) | 2014-03-14 | 2014-03-14 | A kind of automobile exhaust cleaning system and purification method thereof again |
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| CN103850763B CN103850763B (en) | 2016-01-13 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105484838A (en) * | 2016-01-18 | 2016-04-13 | 奇瑞汽车股份有限公司 | Automobile cold start waste gas treatment device and method |
| CN109187882A (en) * | 2018-10-07 | 2019-01-11 | 四川精诚达机动车维修技术咨询有限公司 | A kind of training platform testing and analyzing gasoline engine tail gas |
| CN109798174A (en) * | 2019-03-04 | 2019-05-24 | 南京航空航天大学 | A kind of band is paddled the exhaust system and method for safeguard protection |
| CN110374730A (en) * | 2019-08-17 | 2019-10-25 | 华北理工大学 | A kind of vehicle exhaust cyclic processing device |
| CN112682137A (en) * | 2020-12-25 | 2021-04-20 | 中国第一汽车股份有限公司 | Device for reducing automobile exhaust emission |
| CN112922702A (en) * | 2021-02-05 | 2021-06-08 | 浙江吉利控股集团有限公司 | Exhaust system of vehicle |
| CN113606016A (en) * | 2021-07-22 | 2021-11-05 | 吴庆洪 | Purification device for waste automobile exhaust catalyst |
| CN114776423A (en) * | 2022-04-14 | 2022-07-22 | 一汽解放汽车有限公司 | Diesel vehicle tail gas online collecting and processing device and control method thereof |
| WO2022191272A1 (en) * | 2021-03-11 | 2022-09-15 | いすゞ自動車株式会社 | Exhaust gas aftertreatment device of internal combustion engine |
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| CN109798174B (en) * | 2019-03-04 | 2023-07-07 | 南京航空航天大学 | Automobile exhaust device with wading safety protection and method |
| CN110374730A (en) * | 2019-08-17 | 2019-10-25 | 华北理工大学 | A kind of vehicle exhaust cyclic processing device |
| CN112682137A (en) * | 2020-12-25 | 2021-04-20 | 中国第一汽车股份有限公司 | Device for reducing automobile exhaust emission |
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| CN112922702A (en) * | 2021-02-05 | 2021-06-08 | 浙江吉利控股集团有限公司 | Exhaust system of vehicle |
| WO2022191272A1 (en) * | 2021-03-11 | 2022-09-15 | いすゞ自動車株式会社 | Exhaust gas aftertreatment device of internal combustion engine |
| CN113606016A (en) * | 2021-07-22 | 2021-11-05 | 吴庆洪 | Purification device for waste automobile exhaust catalyst |
| CN114776423A (en) * | 2022-04-14 | 2022-07-22 | 一汽解放汽车有限公司 | Diesel vehicle tail gas online collecting and processing device and control method thereof |
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| CN103850763B (en) | 2016-01-13 |
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