EP0685032A1 - Verfahren und anlage zur tankentlüftung. - Google Patents
Verfahren und anlage zur tankentlüftung.Info
- Publication number
- EP0685032A1 EP0685032A1 EP95903255A EP95903255A EP0685032A1 EP 0685032 A1 EP0685032 A1 EP 0685032A1 EP 95903255 A EP95903255 A EP 95903255A EP 95903255 A EP95903255 A EP 95903255A EP 0685032 A1 EP0685032 A1 EP 0685032A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- tank
- bypass
- adsorption filter
- line
- 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.)
- Granted
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
- F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
-
- 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
- F02M25/089—Layout of the fuel vapour installation
Definitions
- the invention relates to a method for venting a fuel tank of a motor vehicle with an internal combustion engine according to the preamble of patent claim 1 and a tank ventilation system for carrying out the method.
- a generic method for venting a fuel tank or a tank ventilation system for performing this method are known (see, for example, Bosch, Technical Instruction, Motronic, 2nd edition Sept. 1985, pp. 26, 27, 35).
- the adsorption filter is flushed with the aid of a purge air stream which is released from the atmosphere via a ventilation opening and a shut-off valve flows through the adsorption filter and is introduced into the intake pipe leading to the internal combustion engine via a tank ventilation valve which is open for the flushing process, downstream of the throttle valve and the bypass which usually bypasses the throttle valve and contains an idle actuator.
- the purge air flow which has to comprise a substantial amount of air per unit of time for effective purging of the adsorption filter, is a non-negligible leakage flow with respect to the metered amount of air sucked in via the intake manifold, which leads to a lambda error when the internal combustion engine is working.
- the intake pipe is supplied with an additional amount of fuel via the purge air, which can impair the optimization of the operating conditions of the internal combustion engine.
- the invention is based on the object of specifying an improved method for venting a fuel tank of a motor vehicle or an improved tank ventilation system with which an adverse impairment of the regulated mixture composition for an internal combustion engine is avoided during the purging of the adsorption filter.
- the stated object is achieved by a generic method with the features of claim 1 or, as far as the tank ventilation system is concerned, with the features of claim 3.
- An important advantage of the method according to the invention is that the purge air flow enters the intake manifold as a measured leakage stream, since it is branched off from the measured air flow in the intake manifold or in the bypass thereof, so that the set operating parameters for the internal combustion are impaired ⁇ machine is avoided by an additional amount of purge air supplied under all operating conditions.
- FIG. 1 shows a schematic diagram of a preferred embodiment of a tank ventilation system for carrying out the method according to the invention
- FIGS. 2 to 7 with regard to the valves show more detailed illustrations of the tank ventilation system according to FIG. 1 for some typical operating states.
- FIG. 1 shows an intake manifold 10, in which upstream of a throttle valve 12 serving as a throttle element, an air measuring element 13 of a known type, for example a valve air knife, a hot-film sensor or the like, of a fuel injection system, not shown, is arranged.
- the measurement of the intake air quantity can also be carried out downstream of the throttle valve 12 with the aid of an intake manifold pressure measurement.
- a bypass 14 is parallel to the section of the intake manifold 10 provided with the throttle valve provided, in which an idle divider 16 is arranged.
- bypass 14 or the bypass line leads downstream from the throttle valve 12 directly into the intake manifold, since the bypass with the throttle valve 12 closed only has the task of acting behind the throttle valve 12 to the internal combustion engine (not shown) limit the amount of air flowing to the amount of air set by the idle actuator 16.
- a tank ventilation valve 18 (regeneration valve) is inserted into the bypass 14 behind the idle actuator 16, which in the exemplary embodiment is between a position that completely blocks the bypass 14 and In a position completely opening the bypass 14, a controllable valve is formed which occupies each intermediate position.
- a flushing line 20 serving for flushing, via a shut-off valve 22, which is also between a position completely blocking the flushing line 20 and a line 20 completely open 'position, each intermediate position occupying controllable valve is formed, leading to an adsorption filter 24 which sondere insbe ⁇ is formed as activated carbon filter.
- the adsorption filter 24 is connected to a fuel tank 28 via a connecting line 26. By means of a further line 30, the adsorption filter 24 is flushed via the tank ventilation valve. til 18 connected to the end of the bypass line located downstream or to the suction pipe 10. Finally, a further connection of the shut-off valve 22 is connected to the atmosphere via a ventilation opening 32.
- valve 2 relates in particular to an operating state in which the two valves 18, 22 assume their rest position, their valve elements 18a, 22a being in the position shown in FIG the pretension of schematically indicated spring elements 18c and 22c are maintained.
- the tank ventilation valve 18 is fully open with respect to the bypass line 14, and the combustion air flows predetermined by the throttle valve 12 and the idle valve 16 flow via the intake manifold 10 and the bypass 14.
- the tank ventilation valve 18 which completely blocks line 30 in its rest position, opens line 30 in every intermediate position until it is fully opened. Coupled the bypass 14 is closed more and more in the opposite manner to such an opening movement.
- the tank 28 is connected to the opening 32 via the filter 24 and the valve 22 opened for the exhaust air from the tank, while the valve 22 also blocks the line 20 between the bypass 14 and the filter 24.
- the tank 28 is gassed, the fuel vapors are adsorbed in the filter 24 and the exhaust air is released into the atmosphere via the valve 22 and the opening 32.
- the proportion of fuel in the exhaust air depends on the effectiveness and the condition of the adsorption filter 24. In a corresponding manner, fresh air is sucked in from the atmosphere through the opening 32 when a vacuum occurs in the tank 28.
- valve elements 18a and 22a of the valves 18 and 22 are in an intermediate position shown in FIG. 3, which is caused by a corresponding controlled excitation of the field windings 18b and 22b of the valves 18 and 22, respectively is usually brought about by means of a clocked feed current.
- the shut-off valve 22 completely opens the line 20 to the adsorption filter 24 and completely blocks the connection to the ventilation opening 32.
- the tank ventilation valve 18, on the other hand, assumes a position in which the bypass 14 and the line 30 are each partially open.
- the excitation for the valves 18, 22 can be changed if necessary so that the entire pass the idle actuator 16 Air quantity is passed as purge air through the adsorption filter 24.
- the shut-off valve 22 remains in its position completely opening the line 20 to the adsorption filter 24 and completely blocking the connection to the ventilation opening 32, while the tank ventilation valve 18 blocks the bypass 14 and the line 30 opens completely to the suction pipe 10.
- FIG. 5 it is possible to bring the valves 18, 22 or their valve elements 18a and 22a into a position such that the connection between the bypass 14 and the filter 24 is completely interrupted by a corresponding change in the excitation currents and the connection to the ventilation opening 32 is fully opened, which corresponds to the rest position of the valve 22 in FIG.
- valve 18 is brought into a further intermediate position in which the second line 30 coming from the filter 24 is relatively strongly throttled and the Bypass 14 is essentially opened.
- part of the air enriched with fuel vapors can be discharged into the environment after filtering in the adsorption filter 24, while another partial air stream, which can contain a certain amount of fuel vapors, can be discharged via the valve til 18 merged with the bypass flow and passed into the suction pipe 10.
- 3 to 5 can be checked as a function of signals which are generated with the aid of sensors which, for example, the internal pressure in the tank, the composition of the exhaust air at the opening 32 and Detect the fuel concentration in the second line 30 leading back to the valve 18, in order to ensure, possibly in conjunction with other operating parameters, that the small amount of exhaust air, which is additionally introduced into the intake manifold in the operating state according to FIG. 5, and its force ⁇ proportion of the material does not impair the set or desired operating conditions for the internal combustion engine.
- sensors for example, the internal pressure in the tank, the composition of the exhaust air at the opening 32 and Detect the fuel concentration in the second line 30 leading back to the valve 18, in order to ensure, possibly in conjunction with other operating parameters, that the small amount of exhaust air, which is additionally introduced into the intake manifold in the operating state according to FIG. 5, and its force ⁇ proportion of the material does not impair the set or desired operating conditions for the internal combustion engine.
- valve 18 If the valve 18 is brought into an intermediate position in which it establishes a connection between the suction pipe and the line 30 and blocks the bypass 14, while at the same time the valve 22 is brought into an intermediate position in which it connects the tank 28 and the filter 24 to both the bypass 14 and the opening 32, as shown in Fig. 6, then there is the possibility to check the functionality of the system, in the tank 28 to carry out a vacuum test depending on the suction pressure to generate the required vacuum in the suction pipe 10. If, on the basis of the valve positions according to FIG. 6, the valve 18 is brought into the de-energized state and the line 30 is blocked, then there is also the possibility according to FIG. 7 of an overpressure in the tank 28 using suitable devices not shown in the drawing to generate and perform a pressure test of the system.
- a bypass 14 to the throttle valve 12 is also provided in a modification of the invention, the cross section of which, however, is not changed by any idle actuator, but to which in FIGS 7 described lines 20 and 30 and the valves 18, 22 are connected.
- the functions and advantages described in relation to FIGS. 1 to 7 also apply in the case of such a configuration with a bypass 14 around the throttle valve 12 without an idle controller in the bypass 14 and with an idle control by different opening of the throttle valve 12.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4343654 | 1993-12-21 | ||
DE4343654A DE4343654A1 (de) | 1993-12-21 | 1993-12-21 | Verfahren und Anlage zur Tankentlüftung |
PCT/DE1994/001531 WO1995017593A1 (de) | 1993-12-21 | 1994-12-20 | Verfahren und anlage zur tankentlüftung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0685032A1 true EP0685032A1 (de) | 1995-12-06 |
EP0685032B1 EP0685032B1 (de) | 1997-03-19 |
Family
ID=6505649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95903255A Expired - Lifetime EP0685032B1 (de) | 1993-12-21 | 1994-12-20 | Verfahren und anlage zur tankentlüftung |
Country Status (6)
Country | Link |
---|---|
US (1) | US5533479A (de) |
EP (1) | EP0685032B1 (de) |
JP (1) | JPH08507119A (de) |
KR (1) | KR960701294A (de) |
DE (2) | DE4343654A1 (de) |
WO (1) | WO1995017593A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0942080A (ja) * | 1995-07-26 | 1997-02-10 | Toyota Motor Corp | キャニスタ |
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 |
US5857446A (en) * | 1996-07-01 | 1999-01-12 | Norton; Peter | Fuel vapor source |
DE19645382C2 (de) * | 1996-11-04 | 1998-10-08 | Daimler Benz Ag | Tankentlüftungsanlage für ein Fahrzeug mit Verbrennungsmotor |
US5878729A (en) * | 1998-05-06 | 1999-03-09 | General Motors Corporation | Air control valve assembly for fuel evaporative emission storage canister |
DE10102604A1 (de) * | 2001-01-20 | 2002-07-25 | Mann & Hummel Filter | Ansaugsystem für eine Brennkraftmaschine und Verfahren zum Betreiben des Ansaugsystems |
EP1729005A1 (de) * | 2005-06-02 | 2006-12-06 | Delphi Technologies, Inc. | Verdampfungsemissionssteuersystem |
DE102006002718B4 (de) * | 2006-01-19 | 2008-01-03 | Siemens Ag | Verfahren und Vorrichtung zum Betreiben einer Brennkraftmaschine |
US7373930B1 (en) * | 2007-08-23 | 2008-05-20 | Chrysler Llc | Multi-port check-valve for an evaporative fuel emissions system in a turbocharged vehicle |
US8887699B2 (en) * | 2009-02-02 | 2014-11-18 | Borgwarner Inc. | Drive device |
JP5579554B2 (ja) * | 2010-09-22 | 2014-08-27 | 株式会社ケーヒン | 内燃機関の蒸発燃料制御装置 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0726599B2 (ja) * | 1986-12-05 | 1995-03-29 | 日本電装株式会社 | 内燃機関用蒸発燃料制御装置 |
US4926825A (en) * | 1987-12-07 | 1990-05-22 | Honda Giken Kogyo K.K. (Honda Motor Co., Ltd. In English) | Air-fuel ratio feedback control method for internal combustion engines |
JP2721978B2 (ja) * | 1988-08-31 | 1998-03-04 | 富士重工業株式会社 | 空燃比学習制御装置 |
US5005550A (en) * | 1989-12-19 | 1991-04-09 | Chrysler Corporation | Canister purge for turbo engine |
EP0451313B1 (de) * | 1990-04-12 | 1993-01-13 | Siemens Aktiengesellschaft | Tankentlüftungssystem |
JP2534462Y2 (ja) * | 1991-02-18 | 1997-04-30 | 富士重工業株式会社 | キャニスタ |
JPH04311664A (ja) * | 1991-04-11 | 1992-11-04 | Toyota Motor Corp | 蒸発燃料回収装置 |
US5275144A (en) * | 1991-08-12 | 1994-01-04 | General Motors Corporation | Evaporative emission system diagnostic |
US5315980A (en) * | 1992-01-17 | 1994-05-31 | Toyota Jidosha Kabushiki Kaisha | Malfunction detection apparatus for detecting malfunction in evaporative fuel purge system |
US5203300A (en) * | 1992-10-28 | 1993-04-20 | Ford Motor Company | Idle speed control system |
JP2970280B2 (ja) * | 1993-02-05 | 1999-11-02 | トヨタ自動車株式会社 | 発電機駆動用エンジンの制御装置 |
-
1993
- 1993-12-21 DE DE4343654A patent/DE4343654A1/de not_active Withdrawn
-
1994
- 1994-12-20 DE DE59402152T patent/DE59402152D1/de not_active Expired - Fee Related
- 1994-12-20 WO PCT/DE1994/001531 patent/WO1995017593A1/de active IP Right Grant
- 1994-12-20 EP EP95903255A patent/EP0685032B1/de not_active Expired - Lifetime
- 1994-12-20 US US08/507,261 patent/US5533479A/en not_active Expired - Fee Related
- 1994-12-20 JP JP7517093A patent/JPH08507119A/ja active Pending
- 1994-12-20 KR KR1019950703502A patent/KR960701294A/ko not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9517593A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1995017593A1 (de) | 1995-06-29 |
JPH08507119A (ja) | 1996-07-30 |
DE59402152D1 (de) | 1997-04-24 |
KR960701294A (ko) | 1996-02-24 |
DE4343654A1 (de) | 1995-06-22 |
EP0685032B1 (de) | 1997-03-19 |
US5533479A (en) | 1996-07-09 |
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