WO2011051440A1 - Verfahren zum spülen eines aktivkohlefilters - Google Patents
Verfahren zum spülen eines aktivkohlefilters Download PDFInfo
- Publication number
- WO2011051440A1 WO2011051440A1 PCT/EP2010/066460 EP2010066460W WO2011051440A1 WO 2011051440 A1 WO2011051440 A1 WO 2011051440A1 EP 2010066460 W EP2010066460 W EP 2010066460W WO 2011051440 A1 WO2011051440 A1 WO 2011051440A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- activated carbon
- carbon filter
- aav
- valve
- tank
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0809—Judging failure of purge control system
- F02M25/0818—Judging failure of purge control system having means for pressurising the evaporative emission space
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
Definitions
- the present invention relates to a method for rinsing an activated carbon filter of a tank ventilation system of an internal combustion engine according to the preamble of claim 1. Furthermore, the invention relates to a computer program and a computer program product for carrying out the method according to the invention.
- a ventilation opening or duct of the activated carbon filter is in contact with the ambient air.
- fresh air is drawn through the activated carbon via the venting line due to the negative pressure prevailing in the intake manifold.
- the fresh air absorbs the adsorbed fuel in the purge stream and supplies it to the combustion in the engine.
- an activated carbon filter shut-off valve AAV is often provided at the ventilation outlet of the activated carbon filter.
- AAV is closed and the TEV is opened. Due to the vacuum prevailing in the intake manifold, a negative pressure is established in the entire tank system, which is supplied via an in-line system
- Fuel tank installed differential pressure sensor can be detected. When the vacuum reaches a certain threshold, the TEV closes. If the required tightness of the tank system is given, the negative pressure is maintained with the AAV closed and the TEV closed.
- An activated carbon filter has only a limited capacity. If the absorption capacity or the storage capacity of the activated carbon filter is exhausted, drips fuel from the activated carbon filter. This problem occurs especially when the engine is switched off, for example in vehicles with hybrid drive, in which the internal combustion engine or the internal combustion engine is switched off during electric operation.
- the invention therefore has the object to improve the purging and regeneration of the activated carbon filter in order to provide a maximum absorption capacity of the activated carbon filter. Disclosure of the invention
- the inventive method is used for rinsing an activated carbon filter of a tank ventilation system of an internal combustion engine with a fuel tank.
- Activated carbon filters are assigned a tank shut-off valve (TAV), a tank vent valve (TEV) and an activated charcoal filter shut-off valve (AAV).
- TEV tank shut-off valve
- TEV tank vent valve
- AAV activated charcoal filter shut-off valve
- the TAV is preferably closed.
- the AAV can be controlled closed to keep the negative pressure and for intensive rinsing clocked.
- the opening of the TEV is ramped until a predeterminable proportion of fuel has settled in the purge stream.
- a ramp-down of the AAV takes place until a prescribable negative pressure and / or a predeterminable outgassing from the activated carbon filter is established.
- the control of the valves is preferably carried out with the inclusion of the lambda control, by means of which the mass flows or the proportion of fuel in the purge stream can be determined.
- corresponding pressure sensors may be provided for detecting the pressure in the activated carbon filter corresponding pressure sensors may be provided.
- the activated carbon gives the stored fuel vapor or the adsorbed hydrocarbons much more effective and faster than in a conventional rinsing of an activated carbon filter.
- the maximum storage capacity of the activated carbon filter which is required for example in the shutdown phase of the internal combustion engine in a vehicle with hybrid drive can be provided very quickly again.
- Flushing can be stopped by reopening the AAV, releasing the vacuum.
- the AAV can be opened, for example, when the, for example, via a lambda control detectable fuel fraction in the purge stream drops below a predetermined threshold.
- the intensive rinsing can also be terminated by opening the TAV.
- the TAV can be opened, for example, if the pressure in the fuel tank exceeds a predefinable threshold, ie if more fuel vapors have formed. Through the opening of the TAV, the fuel vapors reach the activated charcoal filter where they are collected or absorbed.
- the execution of purging in partial load operation ensures a round engine run and a sufficient pressure gradient for carrying out the method according to the invention.
- the inventive method can be carried out at predetermined intervals or as needed. The demand can be determined, for example, based on the degree of filling of the activated carbon filter.
- the regeneration of the activated carbon can be controlled much better in comparison with conventional rinsing methods. If the concentration of hydrocarbons in the purge stream is low, the hydrocarbons remaining in the activated carbon can be released much more quickly due to the applied negative pressure. At higher hydrocarbon concentrations in the purge stream, however, the negative pressure may be troublesome. An excessively high proportion of fuel in the purge stream, in particular during idling, can lead to out-of-round running, since the hydrocarbon vapor can be distributed unevenly over the cylinders. This is taken into account according to the invention in that the hydrocarbon content in the purge stream is detected, for example, by means of the lambda control, and the TEV is correspondingly activated. Accordingly, as the hydrocarbon concentration in the purge stream increases, the TEV becomes less widely opened. However, since operating the TEV at very low flow rates is inaccurate, in this case preferably no vacuum is applied, i.e., the AAV is not closed.
- the invention further includes a computer program that performs all the steps of the described method when it runs on a computing device or a controller.
- the invention relates to a computer program product with program code, which is stored on a machine-readable carrier, for carrying out the method according to the invention when the program is executed on a computer or a control unit.
- the figure shows a schematic representation of a tank ventilation system of an internal combustion engine for carrying out the inventive method.
- the figure shows the tank ventilation system or the tank ventilation system of an internal combustion engine 1.
- a fuel tank 2 liquid fuel is stored, which partially passes through evaporation in the gaseous phase.
- a removal line 3 is provided, via which the fuel is supplied to the intake manifold 4 of the internal combustion engine 1 in a manner known per se (not shown).
- the fuel vapors produced in the fuel tank 2 are fed via the vent tube 5 to an activated carbon filter 6.
- the volatile hydrocarbons are adsorbed on the activated carbon within the filter 6.
- the activated carbon filter 6 is connected via a ventilation line 7 with the ambient air in connection.
- Another line 8 connects the activated carbon filter 6 with the suction pipe 4.
- a tank venting valve TEV 9 is provided.
- the TEV 9 is opened during engine operation.
- fresh air is sucked through the activated carbon filter 6 through the vacuum prevailing in the intake pipe via the ventilation duct 7.
- the fresh air absorbs hydrocarbons adsorbed on the activated carbon and conducts them via the line 8 to the intake manifold 4 for combustion within the internal combustion engine 1.
- a Aktivkohlefilterabsperrventil AAV 10 is provided in the vent line 7 .
- the AAV 10 is used together with a differential pressure sensor 1 1 in the fuel tank 2 conventionally for checking the tightness of the tank ventilation system.
- These components are used together with another valve in the vent tube 5, the Tankabsperrventil TAV 12, for the inventive method to achieve an intensive flushing of the activated carbon filter 6.
- the intensive flushing according to the invention is preferably carried out in those operating phases of the internal combustion engine 1 in which a supply of relatively large amounts of fuel vapors does not interfere with the operation of the internal combustion engine, for example in the partial combustion engine. load operation.
- the TEV 9 is first opened rampenformig.
- the AAV 10 is closed Rampenformig, so that sets a low pressure in the activated carbon filter 6.
- the very low pressure in the activated carbon filter 6 does not propagate to the fuel tank 2, the TAV 12 is closed.
- the AAV 10 is activated in a clocked manner for intensive rinsing.
- the setting of the vacuum can be done with the following steps:
- the purge rate is maintained. th, ie the TEV 9 will not be opened further. If the permissible limit has not yet been reached, the TEV 9 will be opened further. Due to the ramp-shaped closing of the AAV 10 when the TAV 12 is closed, intensive rinsing of the activated carbon filter 6 then takes place, since the pressure in the activated carbon filter 6 drops further as a result of the ramp-shaped closing of the AAV 10. As a result, the adsorbed in the activated carbon filter 6 hydrocarbons are increasingly released.
- the ramp-like closure of the AAV 10 is stopped as soon as a prescribable or maximum negative pressure has set in the activated carbon filter 6 or until a maximum outgassing fuel is reached.
- the intensive rinsing can be continued by pulsed activation of the AAV 10. If the calculated
- a corresponding pressure-measuring means may be provided for detecting the pressure in the activated carbon filter 6.
- the opening of the TAV 12 can be controlled by the pressure prevailing in the tank 2. If the pressure in the fuel tank 2 exerted by the fuel vapors exceeds a predefinable threshold during the purging process, the TAV 12 can be opened so that fuel vapors reach the activated charcoal filter 6 and the intensive purging is ended. At the next opportunity - after the pressure in the activated carbon filter 6 has dropped again - rinsing can be carried out again in the manner described. If the pressure threshold in the tank 2 is not reached, the TAV 12 remains closed and no further flushing is required since no fuel vapors can reach the activated carbon filter 6 which has already been rinsed.
- the pressure measurement in the fuel tank is preferably carried out by means of the differential pressure sensor 1 1.
- the flushing of the activated carbon filter 6 in the manner described can be carried out at regular intervals, for example at given times and / or given operating phases of the engine 1. In other words,
- the flushing described can be carried out if necessary, which is determined for example on the basis of the fill level of the activated carbon filter 6.
- the inventive intensive rinsing of the activated carbon filter 6 is preferably carried out at low fuel concentration in the purge stream.
- the applied negative pressure could interfere, as too high a fuel content in the purge stream can lead to non-round running in particular at idle.
- the inventive method for rinsing an activated carbon filter is particularly suitable for those applications that require a maximum storage capacity of the activated carbon filter. These are in particular applications in which the internal combustion engine is partially switched off, for example at
- the inventive intensive flushing of the activated carbon filter the storage capacity of the activated carbon filter is optimally utilized, in which case the existing valves and lines can be used.
- the inventive method can be implemented as a computer program, for example in the control unit of a motor vehicle. Since the device components required for carrying out the method according to the invention, ie in particular the various valves, are often already present in the motor vehicle, the method according to the invention can be readily applied to the motor control device in a motor vehicle by loading the corresponding computer program.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010800490424A CN102597480A (zh) | 2009-10-30 | 2010-10-29 | 用于吹洗活性炭过滤器的方法 |
EP10778611A EP2494180A1 (de) | 2009-10-30 | 2010-10-29 | Verfahren zum spülen eines aktivkohlefilters |
JP2012535846A JP2013508616A (ja) | 2009-10-30 | 2010-10-29 | アクティブチャコールキャニスターの洗浄方法 |
US13/503,107 US20120279480A1 (en) | 2009-10-30 | 2010-10-29 | Method for flushing an activated carbon filter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009046237A DE102009046237A1 (de) | 2009-10-30 | 2009-10-30 | Verfahren zum Spülen eines Aktivkohlefilters |
DE102009046237.6 | 2009-10-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011051440A1 true WO2011051440A1 (de) | 2011-05-05 |
Family
ID=43589993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2010/066460 WO2011051440A1 (de) | 2009-10-30 | 2010-10-29 | Verfahren zum spülen eines aktivkohlefilters |
Country Status (7)
Country | Link |
---|---|
US (1) | US20120279480A1 (de) |
EP (1) | EP2494180A1 (de) |
JP (1) | JP2013508616A (de) |
KR (1) | KR20120092606A (de) |
CN (1) | CN102597480A (de) |
DE (1) | DE102009046237A1 (de) |
WO (1) | WO2011051440A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9421498B2 (en) * | 2012-11-12 | 2016-08-23 | Pall Corporation | Systems and methods for conditioning a filter assembly |
US9341148B2 (en) * | 2013-02-04 | 2016-05-17 | Briggs & Stratton Corporation | Evaporative emissions fuel system |
KR102214576B1 (ko) * | 2019-12-12 | 2021-02-10 | 주식회사 현대케피코 | 차량의 연료증발가스 처리시스템 및 그 제어 방법 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19838959A1 (de) * | 1998-08-27 | 2000-03-02 | Bosch Gmbh Robert | Kraftstoffördersystem einer Brennkraftmaschine |
EP1155896A2 (de) * | 2000-05-19 | 2001-11-21 | Bayerische Motoren Werke Aktiengesellschaft | Kontroll- und Steuersystem für die Kraftstofftankanlage eines Kraftfahrzeugs |
DE10201889A1 (de) * | 2001-01-19 | 2002-08-08 | Honda Motor Co Ltd | Steuersystem und -verfahren zum automatischen Stoppen und Starten einer Fahrzeugmaschine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS627962A (ja) * | 1985-07-01 | 1987-01-14 | Mazda Motor Corp | エンジンの蒸発燃料吸着装置 |
US5021071A (en) * | 1990-03-14 | 1991-06-04 | General Motors Corporation | Vehicle fuel tank pressure control method |
JPH08135521A (ja) * | 1994-11-09 | 1996-05-28 | Mitsubishi Motors Corp | 蒸発燃料処理装置 |
JP3317121B2 (ja) * | 1996-01-25 | 2002-08-26 | 株式会社日立製作所 | エバポシステムおよびその診断方法 |
DE19713085C2 (de) * | 1997-03-27 | 2003-06-12 | Siemens Ag | Verfahren zum Überprüfen der Funktionstüchtigkeit einer Tankentlüftungsanlage für ein Kraftfahrzeug |
DE19944388A1 (de) * | 1999-09-16 | 2001-03-22 | Bosch Gmbh Robert | Vorrichtung zum Aufheizen eines Schadstoff-Katalysators |
-
2009
- 2009-10-30 DE DE102009046237A patent/DE102009046237A1/de not_active Withdrawn
-
2010
- 2010-10-29 WO PCT/EP2010/066460 patent/WO2011051440A1/de active Application Filing
- 2010-10-29 KR KR1020127010952A patent/KR20120092606A/ko not_active Application Discontinuation
- 2010-10-29 JP JP2012535846A patent/JP2013508616A/ja active Pending
- 2010-10-29 CN CN2010800490424A patent/CN102597480A/zh active Pending
- 2010-10-29 US US13/503,107 patent/US20120279480A1/en not_active Abandoned
- 2010-10-29 EP EP10778611A patent/EP2494180A1/de not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19838959A1 (de) * | 1998-08-27 | 2000-03-02 | Bosch Gmbh Robert | Kraftstoffördersystem einer Brennkraftmaschine |
EP1155896A2 (de) * | 2000-05-19 | 2001-11-21 | Bayerische Motoren Werke Aktiengesellschaft | Kontroll- und Steuersystem für die Kraftstofftankanlage eines Kraftfahrzeugs |
DE10201889A1 (de) * | 2001-01-19 | 2002-08-08 | Honda Motor Co Ltd | Steuersystem und -verfahren zum automatischen Stoppen und Starten einer Fahrzeugmaschine |
Also Published As
Publication number | Publication date |
---|---|
KR20120092606A (ko) | 2012-08-21 |
CN102597480A (zh) | 2012-07-18 |
EP2494180A1 (de) | 2012-09-05 |
JP2013508616A (ja) | 2013-03-07 |
US20120279480A1 (en) | 2012-11-08 |
DE102009046237A1 (de) | 2011-05-12 |
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