CN102562233A - Engine waste gas aftertreatment system - Google Patents
Engine waste gas aftertreatment system Download PDFInfo
- Publication number
- CN102562233A CN102562233A CN201010607201XA CN201010607201A CN102562233A CN 102562233 A CN102562233 A CN 102562233A CN 201010607201X A CN201010607201X A CN 201010607201XA CN 201010607201 A CN201010607201 A CN 201010607201A CN 102562233 A CN102562233 A CN 102562233A
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- engine
- exhaust
- waste gas
- catalyst converter
- treatment system
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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
- Y02T10/12—Improving ICE efficiencies
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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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- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses an engine waste gas aftertreatment system, being used for purifying waste gas discharged from an exhaust pipe of the engine. The engine waste gas aftertreatment system comprises a catalytic converter, wherein the catalytic converter is connected with the exhaust pipe of the engine by virtue of a turbocharger, the turbocharger is connected with an air inlet pipe of the engine by virtue of an air inlet intercooler, the catalytic converter contains a catalyst which is used for an assisting reaction; when the engine is normally operated, an exhaust switching valve controls high temperature waste gas to enter into the catalytic converter, thus the high temperature waste gas enters into the air after being purified; and when the engine is in a reverse towing working condition, and the exhaust switching valve controls low temperature exhausted gas to enter into the engine to be circulated from a return line or is directly discharged into the air from a bypass pipeline, thus temperature of an aftertreatment device is not influenced by the low temperature exhausted gas. By adopting the engine waste gas aftertreatment system disclosed by the invention, the pipeline of the aftertreatment device is improved, the influence of exhaust to the temperature of the aftertreatment device is reduced, thus the aftertreatment device maintains high-efficiency purification exhaust when the engine is converted into the normal operation from the 'reverse towing' working condition, and hidden troubles that environment is polluted caused by the uncompleted waste gas purification can be effectively eliminated.
Description
Technical field
The present invention relates to motor and make field, particularly a kind of engine exhaust after-treatment system.
Background technique
Motor the refrigeration technique, must be with a cover exhaust gas post-treatment device, in order to the nitrogen oxide (NO in the purifying combustion waste gas in order to satisfy emission standard in adopting fuel oil high-pressure injection, super charge
X), carbon soot particles (PM), carbon monoxide (CO) and hydrocarbon (HC) etc.Usually reprocessing needs the catalyzer assisted reaction, and its normal catalytic temperature requirement is more than 200～250 ℃, and within the specific limits, delivery temperature is high more, and catalyst converter efficient is high more.
In the existing technology scheme, the engine combustion exhaust flow directly gets into after-treatment device after turbosupercharger, after post-processing technology purifies, introduces silencing apparatus again, enters in the atmosphere at last.Unburned Cryogenic air is directly entered after-treatment system under some special operation condition like this, causes that the temperature of after-treatment system reduces.This special operating mode is meant when vehicle band shelves slide deceleration, slide slope; Motor is in towing astern state (various emission test circulations also have this operating mode); This moment, motor continued air-breathing exhaust; But fuel cut-off, the gas that sucks during motor " towing astern " in the cylinder does not burn just by quick discharge.Because live gas gets into before the cylinder by the cooled temperature of intercooler less than 100 ℃, well below the normal working temperature of catalyst converter.If the low temperature refrigeration gas without burning during motor " towing astern " directly gets into after-treatment device; The after-treatment device temperature will sharply be descended and be lower than catalyzer normal catalytic temperature; It is low excessively because of the after-treatment device temperature when motor changes proper functioning over to; The reprocessing reaction is incomplete, and gas of combustion purifies not thorough, and waste gas will pollute the environment after entering atmosphere.
Summary of the invention
The present invention is in order to overcome defective in the above-mentioned existing technology; Through improvement to the after-treatment device pipeline; Reduced exhaust to the after-treatment device Influence of Temperature; After-treatment device is changed over to when running well from " towing astern " operating mode at motor keep efficient purifying exhaust gas, thereby effectively got rid of the not hidden danger of thorough befouling environment of waste-gas cleaning.
Engine exhaust after-treatment system of the present invention; Be used for the waste gas that the purifying engine outlet pipe is discharged; Comprise catalyst converter; Catalyst converter links to each other with engine exhaust pipe through turbosupercharger, and turbosupercharger links to each other with engine air inlet tube through air intake intercooler, contains the catalyzer as assisted reaction in the catalyst converter; In addition, on the front end pipeline of catalyst converter, also be provided with exhaust switchover valve and bypassing exhaust pipeline.When motor under nominal situation, exhaust switchover valve control high-temp waste gas gets in the catalyst converter, enters atmosphere after high-temp waste gas is purified; When motor under the towing astern operating mode, exhaust switchover valve control cryopumping gets into from return line and circulates in the motor or from bypass line, directly enter atmosphere.
Wherein, return line is the connecting pipeline between catalyst converter front end and the compressor air inlet machine pipe, and motor exhaust switchover valve control cryopumping under the towing astern operating mode gets in this connecting pipeline and then gets in the motor in the circulation.
Wherein, the compressor air inlet machine pipe is communicated with turbosupercharger.
Wherein, bypass line is the connecting pipeline parallelly connected with catalyst converter, and motor exhaust switchover valve control cryopumping under the towing astern operating mode gets in this connecting pipeline and then directly enters atmosphere.
Wherein, the switching of the switch of exhaust switchover valve is controlled through Engine ECU.
Wherein, catalyst converter is provided with the catalyzer nozzle and purifies the final vacuum pollutant sensor, and both all monitor through Engine ECU.
Wherein, be provided with temperature transducer in the pipeline of catalyst converter front-end and back-end, said sensor is monitored through Engine ECU.
Compared with prior art, the present invention has following beneficial effect:
1, bypassing exhaust during motor " towing astern ", Cryogenic air does not get into after-treatment system, does not influence the reprocessing catalyst temperature, when making motor change normal operation over to waste-gas cleaning more thoroughly, more timely, after-treatment system work is more stable, more environmental protection;
2, exhaust flow is to by exhaust switchover valve control, and exhaust switchover valve is by engine system ECU integrated management, and process implements more accurately, more reliable.
3, this device has improved after-treatment system efficient under the prerequisite that does not increase engine consumption.
4, connect, control simply, it is convenient to carry out, and is easy to promote.
Description of drawings
Fig. 1 is engine exhaust after-treatment system embodiment's 1 an of the present invention system schematic;
Fig. 2 is engine exhaust after-treatment system embodiment's 2 an of the present invention system schematic.
In conjunction with the accompanying drawing following reference character of mark above that:
The 1-turbosupercharger, 2-engine exhaust pipe, 3-motor, 4-engine air inlet tube; The 5-air intake intercooler, 6-ECU (electronic control unit), 7-compressor air inlet machine pipe, 8-catalyzer nozzle; Temperature transducer before the 9-catalyst converter, the 10-catalyst converter, 11-purifies final vacuum pollutant sensor, temperature transducer behind the 12-catalyst converter; The 13-silencing apparatus, the 14-exhaust switchover valve, 15-is vented to the return line of gas compressor, and 16-is vented to the bypass line of silencing apparatus.
Embodiment
Below in conjunction with accompanying drawing, an embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention does not receive the restriction of embodiment.
Embodiment 1
As shown in Figure 1; Engine exhaust after-treatment system of the present invention comprises catalyst converter 10; This catalyst converter 10 is provided with catalyzer nozzle 8; Nozzle 8 is through ECU (electronic control unit) 6 control ejection catalyzer, and (promptly non-" towing astern " operating mode) makes the high-temp waste gas that gets into catalyst converter 10 fully purify under the motor nominal situation, and purified gas enters atmosphere after getting into silencing apparatus 13.The after-treatment system front end also comprises: turbosupercharger 1, engine exhaust pipe 2, motor 3, engine air inlet tube 4, air intake intercooler 5, compressor air inlet machine pipe 7, the interior circulation that connects and composes engine breathing of these devices.Turbosupercharger 1 is connected (waste gas can get in the catalyst converter through this pipeline) through pipeline with catalyst converter 10.For fear of under " towing astern " operating mode; The cryogenic gas of discharging through turbosupercharger 1 from engine exhaust pipe 2 directly gets in the catalyst converter; On the pipeline of catalyst converter 10 front ends, be provided with an exhaust switchover valve 14; And at this switching valve place the pipeline of catalyst converter 10 front ends is communicated with compressor air inlet machine pipe 7, this switching valve is opened and closed by ECU6 control.Like this, exhaust (Cryogenic air) can be back to the compressor air inlet machine mouth through exhaust switchover valve 14 under motor towing astern operating mode.
Embodiment 1 working procedure is following: during normal working of engine (non-" towing astern " operating mode), the sealing of the valve plate of exhaust switchover valve 14 is vented to gas compressor return line 15, and gas of combustion gets into and is discharged in the atmosphere again after catalyst converter 10 purifies back introducing silencing apparatus 13 noise reductions; During motor " towing astern "; The valve plate sealing of exhaust switchover valve 14 flows to the mouth of pipe of after-treatment system (being catalyst converter 10); Open and be vented to gas compressor return line 15, do not fire air (being Cryogenic air) and directly introduce compressor air inlet machine pipe 7, get into cylinder and discharge again; Promptly in the pipe-line system of compositions such as gas compressor, intercooler, cylinder, circulate, do not flow into catalyst converter 10.
Do not fire air when embodiment 1 scheme makes motor " towing astern " and introduce the turbocharger air compressor inlet end, avoid cryopumping to cool off after-treatment system, make the after-treatment system purifying exhaust air maintain higher level, more environmental protection.
Example 2
As shown in Figure 2, embodiment 2 introduces the scheme of silencing apparatus through the bypass line before the catalyst converter 10 with waste gas, and exhaust switchover valve 14 is arranged on connection place of catalyst converter front end pipeline and this bypass line.Its working procedure is following: during normal working of engine (non-" towing astern " operating mode), the sealing of the valve plate of exhaust switchover valve 14 is vented to muffler bypass pipeline 16, and gas of combustion gets into and is discharged in the atmosphere again after catalyst converter 10 purifies back introducing silencing apparatus 13 noise reductions; During motor " towing astern ", exhaust switchover valve valve plate 14 is opened and is vented to muffler bypass pipeline 16, closes the mouth of pipe that flows to after-treatment system, does not fire to be discharged in the atmosphere after air is directly introduced silencing apparatus 13 noise reductions again, does not fire air and does not flow into catalyst converter 10.
Do not fire air when embodiment 2 scheme makes motor " towing astern " and introduce the silencing apparatus inlet end, avoid cryopumping to cool off after-treatment system, can make the after-treatment system purifying exhaust air maintain higher level equally, more environmental protection.
The blast air of the foregoing description 1,2 is to being controlled by exhaust switchover valve 14 open and close, and its action is carried out by engine control system ECU integrated management.Embodiment 1 return line 15, embodiment 2 bypass line can use flange to be connected with the system main exhaust, but embodiment is not so limited.
The outlet port of catalyst converter 10 also is provided with and purifies final vacuum pollutant sensor 11, is used for the detection of contamination index, and this sensor 11 is monitored through Engine ECU; Also be provided with temperature transducer (being temperature transducer 12 behind preceding temperature transducer 9 of catalyst converter and the catalyst converter) on catalyst converter 10 front end pipelines and the rear end pipeline, both all are connected with ECU, are used for detecting the temperature of catalyst converter front and back ends pipeline gas.
Engine exhaust after-treatment system of the present invention makes bypassing exhaust when motor " towing astern "; Cryogenic air does not get into after-treatment system; Do not influence the reprocessing catalyst temperature; When making motor change normal operation over to waste-gas cleaning more thoroughly, more timely, after-treatment system work is more stable, more environmental protection; Exhaust flow is to by exhaust switchover valve control, and exhaust switchover valve is by engine system ECU integrated management, and process implements more accurately, more reliable; This system has improved after-treatment system efficient under the prerequisite that does not increase engine consumption; System connects, control is simple, and it is convenient to carry out, and is easy to promote.
More than disclosedly be merely a specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (7)
1. engine exhaust after-treatment system; Be used for the waste gas that the purifying engine outlet pipe is discharged; Comprise catalyst converter; Catalyst converter links to each other with engine exhaust pipe through turbosupercharger, and turbosupercharger links to each other with engine air inlet tube through air intake intercooler, contains the catalyzer as assisted reaction in the catalyst converter; It is characterized in that, exhaust switchover valve and bypassing exhaust pipeline are set on the front end pipeline of said catalyst converter; When motor under nominal situation, said exhaust switchover valve control high-temp waste gas gets in the catalyst converter, enters atmosphere after high-temp waste gas is purified; When motor under the towing astern operating mode, said exhaust switchover valve control cryopumping gets into from return line and circulates in the motor or from bypass line, directly enter atmosphere.
2. engine exhaust after-treatment system according to claim 1; It is characterized in that; Said return line is the connecting pipeline between catalyst converter front end and the compressor air inlet machine pipe, and motor said exhaust switchover valve control cryopumping under the towing astern operating mode gets in this connecting pipeline and then gets in the motor in the circulation.
3. engine exhaust after-treatment system according to claim 2 is characterized in that, said compressor air inlet machine pipe is communicated with turbosupercharger.
4. engine exhaust after-treatment system according to claim 1; It is characterized in that; Said bypass line is the connecting pipeline parallelly connected with catalyst converter, and motor said exhaust switchover valve control cryopumping under the towing astern operating mode gets in this connecting pipeline and then directly enters atmosphere.
5. according to any described engine exhaust after-treatment system in the claim 1 to 4, it is characterized in that the switch of said exhaust switchover valve switches to be controlled through Engine ECU.
6. according to any described engine exhaust after-treatment system in the claim 1 to 4, it is characterized in that said catalyst converter is provided with the catalyzer nozzle and purifies the final vacuum pollutant sensor, both all monitor through Engine ECU.
7. according to any described engine exhaust after-treatment system in the claim 1 to 4, it is characterized in that be provided with temperature transducer in the pipeline of said catalyst converter front-end and back-end, said sensor signal is monitored through Engine ECU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010607201XA CN102562233A (en) | 2010-12-24 | 2010-12-24 | Engine waste gas aftertreatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010607201XA CN102562233A (en) | 2010-12-24 | 2010-12-24 | Engine waste gas aftertreatment system |
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| CN102562233A true CN102562233A (en) | 2012-07-11 |
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| CN201010607201XA Pending CN102562233A (en) | 2010-12-24 | 2010-12-24 | Engine waste gas aftertreatment system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614185A (en) * | 2014-12-11 | 2015-05-13 | 中国北方发动机研究所(天津) | Engine emission test rack |
| CN104727905A (en) * | 2013-12-23 | 2015-06-24 | 现代自动车株式会社 | Method of controlling ammonia amount adsorbed in selective catalytic reduction catalyst and exhaust system using the same |
| CN105275553A (en) * | 2014-07-21 | 2016-01-27 | Ge延巴赫两合无限公司 | Exhaust gas aftertreatment apparatus |
| US9771892B2 (en) | 2014-05-20 | 2017-09-26 | Ge Jenbacher Gmbh & Co Og | Method of starting up a thermoreactor |
| CN107620622A (en) * | 2017-10-31 | 2018-01-23 | 潍柴动力股份有限公司 | Exhaust emission control system of engine and diesel vehicle |
| CN108150296A (en) * | 2017-12-27 | 2018-06-12 | 潍柴动力股份有限公司 | Binary channels SCR catalytic convention designs and its control method |
| CN111425286A (en) * | 2020-03-31 | 2020-07-17 | 广西玉柴机器股份有限公司 | Method and system for controlling tail gas emission of gas engine |
| US10801381B2 (en) | 2015-09-04 | 2020-10-13 | Innio Jenbacher Gmbh & Co Og | Exhaust gas after treatment device |
| CN111927617A (en) * | 2020-09-25 | 2020-11-13 | 山东信德玛珂增压器股份有限公司 | Engine air inflow adjusting device and control method thereof |
| CN114320630A (en) * | 2022-03-14 | 2022-04-12 | 潍柴动力股份有限公司 | Control method and system for engine exhaust temperature |
| CN114508437A (en) * | 2022-04-21 | 2022-05-17 | 潍柴动力股份有限公司 | Method, device and equipment for controlling exhaust temperature of engine under back-dragging working condition |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104727905A (en) * | 2013-12-23 | 2015-06-24 | 现代自动车株式会社 | Method of controlling ammonia amount adsorbed in selective catalytic reduction catalyst and exhaust system using the same |
| US9771892B2 (en) | 2014-05-20 | 2017-09-26 | Ge Jenbacher Gmbh & Co Og | Method of starting up a thermoreactor |
| CN105275553B (en) * | 2014-07-21 | 2019-10-01 | Ge延巴赫两合无限公司 | Exhaust aftertreatment device |
| CN105275553A (en) * | 2014-07-21 | 2016-01-27 | Ge延巴赫两合无限公司 | Exhaust gas aftertreatment apparatus |
| US10458299B2 (en) | 2014-07-21 | 2019-10-29 | Innio Jenbacher Gmbh & Co Og | Exhaust gas aftertreatment apparatus |
| CN104614185A (en) * | 2014-12-11 | 2015-05-13 | 中国北方发动机研究所(天津) | Engine emission test rack |
| US10801381B2 (en) | 2015-09-04 | 2020-10-13 | Innio Jenbacher Gmbh & Co Og | Exhaust gas after treatment device |
| CN107620622A (en) * | 2017-10-31 | 2018-01-23 | 潍柴动力股份有限公司 | Exhaust emission control system of engine and diesel vehicle |
| CN108150296A (en) * | 2017-12-27 | 2018-06-12 | 潍柴动力股份有限公司 | Binary channels SCR catalytic convention designs and its control method |
| CN111425286A (en) * | 2020-03-31 | 2020-07-17 | 广西玉柴机器股份有限公司 | Method and system for controlling tail gas emission of gas engine |
| CN111927617A (en) * | 2020-09-25 | 2020-11-13 | 山东信德玛珂增压器股份有限公司 | Engine air inflow adjusting device and control method thereof |
| CN114320630A (en) * | 2022-03-14 | 2022-04-12 | 潍柴动力股份有限公司 | Control method and system for engine exhaust temperature |
| CN114508437A (en) * | 2022-04-21 | 2022-05-17 | 潍柴动力股份有限公司 | Method, device and equipment for controlling exhaust temperature of engine under back-dragging working condition |
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Application publication date: 20120711 |