CN104791056B - A kind of method that utilization phase transition of vacuum insulation reduces cold start emission - Google Patents
A kind of method that utilization phase transition of vacuum insulation reduces cold start emission Download PDFInfo
- Publication number
- CN104791056B CN104791056B CN201510126358.3A CN201510126358A CN104791056B CN 104791056 B CN104791056 B CN 104791056B CN 201510126358 A CN201510126358 A CN 201510126358A CN 104791056 B CN104791056 B CN 104791056B
- Authority
- CN
- China
- Prior art keywords
- cavity
- engine
- ecu
- valve
- catalyst
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
-
- 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
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to the catalytic unit that a kind of insulation of utilization phase transition of vacuum reduces cold start emission.The device is arranged on waste pipe, and catalyst carrier is wrapped up with the closing chamber equipped with phase-change material, is made at it in the cavities.After engine cut-off, valve switch drive device receives the signal that ECU sends, close the valve of catalyst converter both sides, air pump system makes catalyst converter be in vacuum environment, to reduce scattering and disappearing for catalyst converter energy, while phase-change material discharges latent heat in process of setting, it is ensured that catalyst converter sufficiently high temperature when engine is again started up, the time that catalyst reaches initiation temperature is shortened, vehicle cold-start discharge is greatly reduced.Catalyst temperature remains at 250 DEG C after being stopped 24 hours using the device.Engine yearns for radiating, while phase-change material absorbs heat in melting process, it is ensured that too high EGT is unlikely to make catalyst high temperature deactivation when high load capacity works by air is filled with cavity, increasing its heat transfer coefficient.
Description
Technical field
The present invention provides a kind of catalytic unit of utilization vacuum-phase-transition heat-preserving reduction cold start emission, and in particular to a kind of
The design and control method of new catalytic device, belong to field of internal combustion engine.
Background technology
With sharply increasing for automobile quantity, motor vehicle emission exacerbates the pollution of air and the deterioration of environment, motor vehicle emission
Thing turns into the major source of urban air pollution, reduces the discharge of engine dusty gas and has become internal combustion engine continuation development urgently
One of major issue of solution.Latest national standards, the whole nation will implement the 5th stage state motor vehicle in 1 day January in 2018
Discharge standard, Beijing will in 1 day January in 2016 the 5th stage of early excise state motor vehicle discharge standard.The standard of state five,
Equivalent to the standard of Europe five of European Union, European Union since 2009 perform, it is to nitrogen oxides, hydrocarbon, an oxygen
The limitation for changing the vehicular emission things such as carbon and suspended particles is more harsh.Carried to state IV from state I, often improve a standard, bicycle
Pollution reduces 30% to 50%.In discharge cycle test, the FTP-75 tests according to Environmental Protection Agency are learnt, are equipped with three
Imitate catalytic converter gasoline engine nearly 80% HC, CO discharge be in the initial 200s of cold start produce, reason be due to
Cold-start phase engine exhaust temperature is relatively low, lambda sensor and ternary catalyzing unit cisco unity malfunction.Therefore, arranged if taking
HC discharges when control starts are applied, vehicle gasoline engine just can meet emission regulation demands higher.
Current gasoline car cold start emission control mainstream technology be by make ternary catalyzing unit be rapidly achieved initiation temperature come
Reduce HC and CO discharge, the main method in terms of catalyst converter Fast light-off research is made be reduce catalyst converter initiation temperature and
Catalyst temperature is improved as early as possible.And the former is due to the limitation of catalyst technology, effect is limited, and also needs to that your gold increased
The content of category, can cause the increase of system cost.So more having concentrated on of research of catalyst converter Fast light-off is improved as early as possible
The technologies such as catalyst converter inlet temperature aspect, such as near dress catalyst converter, catalyst converter fuel Heating, catalyst converter electrical heating.Nearly dress catalyst converter
The HC in first 60s after cold start-up cannot be converted；Catalyst converter fuel Heating is, it is necessary to a combustion chamber, can produce extra row
Put；Catalyst converter electric-heating technology, with respect to fuel Heating catalyst converter simple structure, but will be such that catalyst temperature reaches in a short time
Initiation temperature needs the substantial amounts of electric energy of battery consumption.
The content of the invention
The drawbacks described above of emission control system during engine cold-start existing the invention aims to customer service, utilizes
The waste heat of engine, there is provided the catalytic unit and control method of a kind of utilization vacuum-phase-transition heat-preserving reduction cold start emission, profit
Discharge amount of exhaust gas when can effectively reduce engine cold-start with the device.
The present invention is adopted the following technical scheme that：
A kind of catalytic unit of utilization vacuum-phase-transition heat-preserving reduction cold start emission, it is characterised in that：Including ECU
5th, air pump system 4, valve switch drive system 3, catalyst carrier 7, cavity 8, phase-change material 9, phase-change material 9 are close to catalysis
The outside of agent carrier 7 is set, and is all encapsulated in closed chamber with catalyst carrier 7, and its outside is that pressure is installed in cavity 8, cavity 8
The front exhaust pipe 1 of force snesor 15. and back segment blast pipe 10 are equipped with valve switch drive system 3, wherein leading portion at cavity 8
Blast pipe 1 is also equipped with temperature sensor 2.
Using the method for described device, it is characterised in that step is as follows：
1) device controls the opening and closing of valve 6 according to the enabling signal 11 and stop sign 12 of engine；Start
Machine is under running status, and valve 6 keeps it turned on；During engine start, ECU 5 transmits the enabling signal 11 of engine
To valve switch drive system 3, valve switch drive system 3 opens the detection stream of 6. temperature sensor of valve 2 through front exhaust pipe 1
Interior EGT simultaneously passes to ECU 5；
Engine is under dead ship condition, and valve 6 is remained closed, and cavity 8 is vacuum chamber, and the vacuum in cavity 8 reduces dress
Put scattering and disappearing for interior heat；
2) when the temperature signal that ECU 5 receives is more than 800 DEG C, ECU 5 sends inflation letter to air pump system 4
Numbers 13, air pump system 4 is received after inflation signal 13 to air is filled with cavity, until cavity pressure and ambient pressure are balanced；
With being filled with, air capacity is bigger, and the heat transfer coefficient in chamber is bigger, is conducive to scattering and disappearing for waste-gas heat, prevents catalyst high temperature from losing
It is living；When the temperature signal that ECU 5 receives is less than 800 DEG C, ECU 5 sends pumping signal 14, gas to air pump system 4
Pumping system 4 takes out air from inside to outside after receiving pumping signal 14 from cavity；As air is reduced, heat transfer coefficient reduces, and heat dissipates
Lose and reduce；
During engine cut-off, the stop sign 12 of engine is passed to valve switch drive system 3, gas by ECU 5
Door switch drive system 3 closes valve 6, now judges whether cavity 8 is vacuum by pressure sensor 15, if cavity 8 is not
It is vacuum, ECU 5 sends pumping signal 14 to air pump system 4, air pump system is received after pumping signal 14 from cavity
Outwards take out air, it is ensured that cavity 8 is vacuum chamber under dead ship condition.
The phase-change material mentioned in the present apparatus is silicon aluminum alloy material, and phase-change material absorbs or release during undergoing phase transition
The latent heat of amplification quantity.
Operation principle of the invention：The device is arranged on automobile engine exhaust pipe, with the closing equipped with phase-change material
Catalyst carrier is wrapped up in chamber, it is in the variable cavity of gas heat transfer coefficient (gas heat transfer coefficient is adjusted by vacuum).
After engine cut-off, the valve of catalyst converter both sides is closed, catalyst converter is in vacuum environment, to reduce dissipating for catalyst converter energy
Lose, while phase-change material discharges latent heat in process of setting, it is ensured that catalyst converter sufficiently high temperature when engine is again started up.
Engine can yearn for radiating, while phase transformation when high load capacity works by air is filled with cavity, increasing its heat transfer coefficient
Material absorbs heat in melting process, it is ensured that too high EGT is unlikely to make catalyst high temperature deactivation.
The beneficial effects of the invention are as follows by using electric controlled vacuum-phase-transition heat-preserving device, when improve engine cold-start
The temperature of catalyst converter, shortens the time that catalyst reaches initiation temperature, greatly reduces vehicle cold-start discharge.Engine bed
Frame experiment shows that catalyst temperature remains at 250 DEG C after being stopped 24 hours using the device, so as to reduce engine cold-start
HC discharges more than 80%, CO discharges more than 40%, and NOx emission more than 40% makes common vehicle not carry out big structural modification and reaches
To the discharge standard of Europe more than 4.
Brief description of the drawings
Fig. 1 structures of the invention and fundamental diagram
In figure：1st, front exhaust pipe, 2, temperature sensor, 3, valve switch drive system, 4, air pump system, 5, automatically controlled list
Unit, 6, valve, 7, catalyst carrier, 8, cavity, 9, phase-change material, 10, back segment blast pipe, 11, Engine Start Signal, 12,
Engine stop signal, 13, inflation signal, 14, pumping signal, 15, pressure sensor.
Specific embodiment
It is described further for the present invention with reference to the accompanying drawings and detailed description：
The present apparatus mainly includes ECU 5, air pump system 4, valve switch drive system 3, catalyst carrier 7, cavity
8th, phase-change material 9, phase-change material 9 is encapsulated in and is close in the closed chamber in the outside of catalyst carrier 7, and its outside is cavity 8, cavity
The inflation signal 13 and pumping signal 14 that 8 vacuum is sent by air pump system 4 according to ECU 5 are adjusted, and cavity 8 installs pressure
The front exhaust pipe 1 of force snesor 15. and back segment blast pipe 10 are equipped with valve switch drive system 3, wherein leading portion at cavity 8
Blast pipe 1 is also equipped with temperature sensor 2, and the drive device controls gas according to the enabling signal 11 and stop sign 12 of engine
The opening and closing of door 6.Engine is under running status, and valve 6 keeps it turned on；Engine is under dead ship condition, valve 6
Remain closed, cavity 8 is vacuum chamber.
Survey data shows, more than 90% vehicle can be restarted within 24 hours in parking, it is ensured that engine start
When temperature for reduce vehicle launch when discharge it is most important.Phase-change material is using the relatively low silico-aluminum material of phase transition temperature
Material.
Waste gas absorption is carried out using cold-starting automobile exhaust absorption device as described above, is to follow the steps below control
's：
1) engine is under dead ship condition, and valve 6 is in closure state, and the vacuum in cavity 8 can be reduced in device
Heat scatter and disappear.During engine start, the enabling signal 11 of engine is passed to valve switch drive system 3 by ECU 5,
Valve switch drive system 3 is opened the detection stream of 6. temperature sensor of valve 2 through the EGT in front exhaust pipe 1 and is passed to
ECU 5.
2) when the temperature signal that ECU 5 receives is more than 800 DEG C, ECU 5 sends inflation letter to air pump system 4
Numbers 13, air pump system 4 is received after inflation signal 13 to air is filled with cavity, until cavity pressure and ambient pressure are balanced.
With being filled with, air capacity is bigger, and the heat transfer coefficient in chamber is bigger, is conducive to scattering and disappearing for waste-gas heat, prevents catalyst high temperature from losing
It is living.When the temperature signal that ECU 5 receives is less than 800 DEG C, ECU 5 sends pumping signal 14, gas to air pump system 4
Pumping system 4 takes out air from inside to outside after receiving pumping signal 14 from cavity.As air is reduced, heat transfer coefficient reduces, and heat dissipates
Lose and reduce.
3) during engine cut-off, the stop sign 12 of engine is passed to valve switch drive system 3 by ECU 5,
Valve switch drive system 3 closes valve 6. now can judge whether cavity 8 is vacuum by pressure sensor 15, if empty
Chamber 8 is not vacuum, and ECU 5 sends pumping signal 14 to air pump system 4, and air pump system is received after pumping signal 14 from sky
Air is taken out from inside to outside in chamber, it is ensured that cavity 8 is vacuum chamber under dead ship condition.
Claims (1)
1. the method that a kind of utilization vacuum-phase-transition heat-preserving reduces cold start emission, using following device：The device includes automatically controlled list
First (5), air pump system (4), valve switch drive system (3), catalyst carrier (7), cavity (8), phase-change material (9), phase transformation
Material (9) is close to catalyst carrier (7) outside and sets, and is all encapsulated in closed chamber with catalyst carrier (7), its outside
It is pressure sensor (15) front exhaust pipes (1) and back segment blast pipe (10) to be installed near cavity in cavity (8), cavity (8)
(8) place is equipped with valve switch drive system (3), and wherein front exhaust pipe (1) is also equipped with temperature sensor (2)；
It is characterized in that step is as follows：
1) device controls the opening and closing of valve (6) according to the enabling signal (11) and stop sign (12) of engine；Hair
Motivation is under running status, and valve (6) keeps it turned on；During engine start, ECU (5) is by the enabling signal of engine
(11) valve switch drive system (3) is passed to, valve switch drive system (3) opens valve (6)；Temperature sensor (2) is examined
Flow measurement is through the EGT in front exhaust pipe (1) and passes to ECU (5)；
Engine is under dead ship condition, and valve (6) is remained closed, and cavity (8) is vacuum chamber, and the vacuum in cavity (8) is reduced
Heat scatters and disappears in device；
2) when the temperature signal that ECU (5) receives is more than 800 DEG C, ECU (5) sends inflation to air pump system (4)
Signal (13), air pump system (4) is received in the backward cavity of inflation signal (13) and is filled with air, until cavity pressure is pressed with extraneous
Dynamic balance；With being filled with, air capacity is bigger, and the heat transfer coefficient in chamber is bigger, is conducive to scattering and disappearing for waste-gas heat, prevents catalyst
High temperature deactivation；When the temperature signal that ECU (5) receives is less than 800 DEG C, ECU (5) sends to air pump system (4)
Pumping signal (14), air pump system (4) takes out air from inside to outside after receiving pumping signal (14) from cavity；As air is reduced,
Heat transfer coefficient reduces, and heat scatters and disappears and reduces；
During engine cut-off, the stop sign (12) of engine is passed to valve switch drive system (3) by ECU (5),
Valve switch drive system (3) closes valve (6), now judges whether cavity (8) is vacuum by pressure sensor (15), such as
Fruit cavity (8) is not vacuum, and ECU (5) sends pumping signal (14) to air pump system (4), and air pump system (4) is received
Air is taken out from inside to outside from cavity after pumping signal (14), it is ensured that cavity (8) is vacuum chamber under dead ship condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510126358.3A CN104791056B (en) | 2015-03-21 | 2015-03-21 | A kind of method that utilization phase transition of vacuum insulation reduces cold start emission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510126358.3A CN104791056B (en) | 2015-03-21 | 2015-03-21 | A kind of method that utilization phase transition of vacuum insulation reduces cold start emission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104791056A CN104791056A (en) | 2015-07-22 |
| CN104791056B true CN104791056B (en) | 2017-06-16 |
Family
ID=53556175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510126358.3A Expired - Fee Related CN104791056B (en) | 2015-03-21 | 2015-03-21 | A kind of method that utilization phase transition of vacuum insulation reduces cold start emission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104791056B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108996473B (en) * | 2018-08-24 | 2023-08-22 | 宁波吉宏醇氢动力技术有限公司 | Cracker and vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1144551A (en) * | 1994-01-27 | 1997-03-05 | 戴维·K·本森 | Thermal management of vehicle exhaust systems |
| DE3835939C2 (en) * | 1987-10-31 | 1998-01-15 | Volkswagen Ag | Exhaust system |
| US6128898A (en) * | 1997-11-19 | 2000-10-10 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying apparatus for internal combustion engine |
| US6162403A (en) * | 1998-11-02 | 2000-12-19 | General Motors Corporation | Spin formed vacuum bottle catalytic converter |
| CN103742235A (en) * | 2013-12-31 | 2014-04-23 | 高志男 | Automatic heating and warming device used for motor vehicle exhaust emission |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04101010A (en) * | 1990-08-17 | 1992-04-02 | Mazda Motor Corp | Exhaust fine particle eliminating device for diesel engine |
-
2015
- 2015-03-21 CN CN201510126358.3A patent/CN104791056B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3835939C2 (en) * | 1987-10-31 | 1998-01-15 | Volkswagen Ag | Exhaust system |
| CN1144551A (en) * | 1994-01-27 | 1997-03-05 | 戴维·K·本森 | Thermal management of vehicle exhaust systems |
| US6128898A (en) * | 1997-11-19 | 2000-10-10 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying apparatus for internal combustion engine |
| US6162403A (en) * | 1998-11-02 | 2000-12-19 | General Motors Corporation | Spin formed vacuum bottle catalytic converter |
| CN103742235A (en) * | 2013-12-31 | 2014-04-23 | 高志男 | Automatic heating and warming device used for motor vehicle exhaust emission |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104791056A (en) | 2015-07-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104727904B (en) | Automobile cold start emission absorbing device and control method thereof | |
| CN102822481B (en) | Regeneration assist calibration | |
| JP4325704B2 (en) | Exhaust gas purification system for internal combustion engine | |
| CN102213145B (en) | Selectivity stores fuel reforming | |
| CN108678839B (en) | DPF air supplementing and regenerating system and method based on brake energy recovery | |
| CN103975147B (en) | Internal combustion engine | |
| CN105888805B (en) | Method and device for increasing and/or decreasing the exhaust gas temperature of an internal combustion engine | |
| US20130047607A1 (en) | Method for exhaust-gas aftertreatment with reduced emissions | |
| CN100383367C (en) | Automobile cold start exhaust absorption device and method | |
| US8818691B2 (en) | Exhaust system and method for controlling temperature of exhaust gas in an exhaust system | |
| US20170333843A1 (en) | Fuel reformer | |
| WO2008127755A2 (en) | Secondary air system for a combustion engine breathing system | |
| CN102191981A (en) | Targeted particular matter filter regeneration system | |
| CN101457704A (en) | Control system for a particulate matter filter | |
| CN105952516A (en) | Emission, adsorption and desorption system for cold start of automobile and control method | |
| CN110080917B (en) | Control system and control method for reducing oil consumption and emission of whole vehicle | |
| CN103382898A (en) | Internal combustion engine and method for controlling internal combustion engine speed | |
| JP2006200473A (en) | Control device for engine with exhaust gas after-treating device | |
| JPH10238337A (en) | Monitoring method of catalyst performance in exhaust current of internal combustion engine | |
| CN101575999A (en) | Hydrogen selective catalytic reduction device and control method thereof | |
| CN104791056B (en) | A kind of method that utilization phase transition of vacuum insulation reduces cold start emission | |
| US8141348B2 (en) | Engine after-treatment controls using dosing below catalyst light-off temperature | |
| CN104819036A (en) | Aftertreatment system for internal combustion engines | |
| CN202900475U (en) | Intelligent double-circuit air inlet unit of supercharged engine | |
| JP2003166411A (en) | Exhaust emission control device of internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170616 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |