EP1314879A1 - Verfahren zur Steuerung der Abgabe von Kraftstoffdampf aus einem Tankentlüftungssystem - Google Patents
Verfahren zur Steuerung der Abgabe von Kraftstoffdampf aus einem Tankentlüftungssystem Download PDFInfo
- Publication number
- EP1314879A1 EP1314879A1 EP01127980A EP01127980A EP1314879A1 EP 1314879 A1 EP1314879 A1 EP 1314879A1 EP 01127980 A EP01127980 A EP 01127980A EP 01127980 A EP01127980 A EP 01127980A EP 1314879 A1 EP1314879 A1 EP 1314879A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control valve
- intake duct
- fuel vapor
- opening time
- internal combustion
- 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
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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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0032—Controlling the purging of the canister as a function of the engine operating conditions
- F02D41/004—Control of the valve or purge actuator, e.g. duty cycle, closed loop control of position
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- 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
- F02M2025/0845—Electromagnetic valves
Definitions
- the invention relates to a method for controlling the delivery of fuel vapor from a tank ventilation system into a preferably cylinder-specific one Intake channel of an internal combustion engine, wherein a control valve the fuel vapor synchronizes with the intake stroke of the engine cylinder can get into the assigned intake duct.
- a control valve the fuel vapor synchronizes with the intake stroke of the engine cylinder can get into the assigned intake duct.
- control valve designed as a clock valve then determines in cooperation with that in the intake duct of the internal combustion engine (or the Internal combustion engine cylinders) prevailing negative pressure the volume flow of fuel vapor through the control valve.
- a control valve designed as a clock valve determines in cooperation with that in the intake duct of the internal combustion engine (or the Internal combustion engine cylinders) prevailing negative pressure the volume flow of fuel vapor through the control valve.
- Another known system works without such an upstream volume.
- all cylinders of the internal combustion engine are over one Hose system with each other as well as with the control valve or tank ventilation valve connected.
- FIG. 2 the pressure curve in the intake duct of an internal combustion engine cylinder is roughly generalized for two different load points or operating points of the internal combustion engine. Furthermore, an apparatus for performing the method according to the invention is shown in a highly simplified manner in FIG .
- the reference numeral 1 denotes a cylinder of a reciprocating piston internal combustion engine (not shown), in the combustion chamber 2 of which fresh gas provided with fuel can be supplied via an intake duct 4 which can be closed by an inlet valve 3.
- a throttle valve 5 or the like is also provided in the intake duct 4, by means of which the fresh gas quantity supplied to the combustion chamber 2 can be influenced.
- the Reference number 6 designated tank ventilation system.
- the Fuel tank 7 there can the fuel vapors arising in a fuel tank 7 in one Activated carbon filter 8, which is suitable with the Fuel tank 7 is connected.
- This activated carbon filter 8 must of course also be emptied or flushed again, taking in from the environment So-called purging air flow is passed through the activated carbon filter 8, which thereby Receives fuel vapors and this via a purge line 9 in the intake duct 4 of the engine cylinder 1 downstream of the throttle valve 5 initiates, so that these fuel vapors finally in the combustion chamber 2 can be burned (and thus used).
- a control valve 10 designed as a clock valve (also called tank ventilation valve) provided, through which the in the Intake duct 4 amount of purge air (mixed with fuel vapor) can be dosed or determined. From an electronic control unit 11, this control valve 10 is appropriately controlled for this. Indeed can not namely in all possible operating points of the internal combustion engine any purge air flow into combustion chamber 2 (or the combustion chambers a multi-cylinder internal combustion engine), since this Purge air flow with an initially undefined fuel component the normal one Combustion process interferes.
- a clock valve also called tank ventilation valve
- the opening time of the control valve 10 is preferably placed in an area in which a higher negative pressure prevails in the intake duct 4 , while for the control or metering of smaller amounts of fuel vapor, the opening time is placed in a range in which there is already a lower vacuum in the intake duct 4.
- the control valve 10 is opened, for example, at the time t 1 for the first case (ie a large amount of purge air and fuel), since there is a greater driving pressure drop than in the later time t 2 , at which time, for example, in the second Case (ie less purge air and fuel quantity), the control valve 10 is opened. While in the former case a relatively large amount of purge air and fuel vapor can be introduced into the intake duct 4 in a simple manner even with a relatively short opening duration ⁇ t, in the second case, namely when opening at time t 2 , a more precise metering of the amount supplied is advantageous of fuel vapor (and purge air) possible.
- a finer dosage can be achieved by changing the opening duration ⁇ t in the order of magnitude of, for example, 10 ° KW of the purge air volume take place than at an earlier point in time, for example t 1 shortly after opening the inlet valve 3.
- one or of the cylinders 1 can be viewed over several successive work cycles and, starting from the first delivery of fuel vapor into the intake duct 4, the opening time of the control valve 10 for the subsequent work cycles can increasingly move from a region of lower negative pressure in the intake duct to one region with a higher vacuum in the intake duct.
- the flushing of the activated carbon filter 8 cannot be carried out in all operating points of the internal combustion engine. If this purging is now started or started, there is of course a so-called first-time delivery of fuel vapor into the intake duct 4, which, as suggested, should take place relatively late in the intake stroke of the cylinder, so that the control valve 10 opens, for example, at the time of opening t 2 shall be.
- the control valve 10 is then increasingly opened in areas of higher negative pressure in the intake duct, ie in the direction of the opening time t 1 , in order to enable the control unit 11 which controls the control valve 10 to recognize the behavior of the overall system and to react appropriately, ie to continue to control the control valve 10 in a suitable manner and to appropriately determine its opening duration ⁇ t and its opening time.
- the control unit 11 receives suitable feedback from the control electronics of the internal combustion engine, in which, as is known, the exhaust gas composition of the internal combustion engine is also analyzed.
- the inevitable opening delay of the control valve 10 can also be taken into account or compensated for, that is to say the period of time that elapses between a corresponding activation of the control valve 10 and its actual opening.
- the individual can in a multi-cylinder internal combustion engine Cylinders by varying the control valve opening time or the Control valve opening time and the control valve closing time a different amount of fuel vapor from the tank ventilation system are fed.
- the invention always offers Procedure the possibility of a crank angle synchronous control of the control valve 10 or tank vent valve. You can the opening and closing points of this control valve 10 are set so that the controls are reproducible to suitable crankshaft positions respectively.
- This proposed control advantageously allows use of control valves with a compared to previously known systems higher static flushing volume or basic flow rate. This enables the meterability of a small control valve and the high flush volume a large control valve to combine without disadvantages. Further there is the possibility of cylinder selective and work cycle selective Metering of the by the control valve 10 or tank vent valve and the other advantages described.
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)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
Die Lösung dieser Aufgabe ist dadurch gekennzeichnet, dass der Öffnungszeitpunkt des Steuerventils variabel ist. Vorteilhafte Weiterbildungen sind Inhalt der Unteransprüche.
Claims (6)
- Verfahren zur Steuerung der Abgabe von Kraftstoffdampf aus einem Tankentlüftungssystem (6) in einen bevorzugt zylinderindividuellen Ansaugkanal (4) einer Brennkraftmaschine, wobei ein Steuerventil (10) den Kraftstoffdampf synchronisiert zum Ansaugtakt des Brennkraftmaschinen-Zylinders (1) in den zugeordneten Ansaugkanal (4) gelangen lässt,
dadurch gekennzeichnet, dass der Öffnungszeitpunkt des Steuerventils (10) variabel ist. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass für die Steuerung oder Dosierung höherer Mengen von Kraftstoffdampf der Öffnungszeitpunkt in einen Bereich gelegt wird, in welchem im Ansaugkanal (4) ein höherer Unterdruck herrscht, während für die Steuerung oder Dosierung geringerer Mengen von Kraftstoffdampf der Öffnungszeitpunkt in einen Bereich gelegt wird, in welchem im Ansaugkanal (4) bereits ein niedrigerer Unterdruck herrscht. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass auch der Schließzeitpunkt des Steuerventils (10) variabel ist und dass dieses nicht geöffnet wird oder ist, wenn im Ansaugkanal (4) Überdruck vorliegt. - Verfahren nach einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet, dass über mehrere aufeinanderfolgende Arbeitsspiele eines Zylinders (1) betrachtet und ausgehend von einer erstmaligen Abgabe von Kraftstoffdampf in den Ansaugkanal (4) der Öffnungszeitpunkt für die folgenden Arbeitsspiele zunehmend von einem Bereich geringeren Unterdrucks im Ansaugkanal in einen Bereich mit höherem Unterdruck im Ansaugkanal verschoben wird. - Verfahren nach einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet, dass über mehrere aufeinanderfolgende Arbeitsspiele eines Zylinders (1) betrachtet die diesem zugeführte Menge von Kraftstoffdampf aus dem Tankentlüftungssystem (6) durch Variation des Steuerventil-Öffnungszeitpunktes oder des Steuerventil-Öffnungszeitpunktes und des Steuerventil-Schließzeitpunktes von Arbeitsspiel zu Arbeitsspiel verändert wird, um die Laufruhe oder das dynamische Verhalten der Brennkraftmaschine zu verbessern. - Verfahren nach einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet, dass bei einer mehrzylindrigen Brennkraftmaschine den einzelnen Zylindern durch Variation des Steuerventil-Öffnungszeitpunktes oder des Steuerventil-Öffnungszeitpunktes und des Steuerventil-Schließzeitpunktes eine unterschiedliche Menge von Kraftstoffdampf aus dem Tankentlüftungssystem (6) zugeführt wird.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01127980A EP1314879B1 (de) | 2001-11-24 | 2001-11-24 | Verfahren zur Steuerung der Abgabe von Kraftstoffdampf aus einem Tankentlüftungssystem |
DE50112195T DE50112195D1 (de) | 2001-11-24 | 2001-11-24 | Verfahren zur Steuerung der Abgabe von Kraftstoffdampf aus einem Tankentlüftungssystem |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01127980A EP1314879B1 (de) | 2001-11-24 | 2001-11-24 | Verfahren zur Steuerung der Abgabe von Kraftstoffdampf aus einem Tankentlüftungssystem |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1314879A1 true EP1314879A1 (de) | 2003-05-28 |
EP1314879B1 EP1314879B1 (de) | 2007-03-14 |
Family
ID=8179342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01127980A Expired - Lifetime EP1314879B1 (de) | 2001-11-24 | 2001-11-24 | Verfahren zur Steuerung der Abgabe von Kraftstoffdampf aus einem Tankentlüftungssystem |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1314879B1 (de) |
DE (1) | DE50112195D1 (de) |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4530210A (en) * | 1981-12-25 | 1985-07-23 | Honda Giken Kogyo K.K. | Apparatus for controlling evaporated fuel in an internal combustion engine having a supercharger |
JPH04252854A (ja) * | 1991-01-29 | 1992-09-08 | Toyota Motor Corp | エンジンの蒸発燃料制御装置 |
DE4225993C1 (de) * | 1992-08-06 | 1994-01-13 | Freudenberg Carl Fa | Vorrichtung zum vorübergehenden Speichern und dosierten Einspeisen der im Freiraum einer Tankanlage befindlichen flüchtigen Kraftstoffbestandteile in das Ansaugrohr einer Verbrennungskraftmaschine |
US5351193A (en) * | 1991-07-01 | 1994-09-27 | General Motors Corporation | Canister purge control method |
US5429098A (en) * | 1993-02-05 | 1995-07-04 | Unisia Jecs Corporation | Method and apparatus for controlling the treatment of fuel vapor of an internal combustion engine |
DE19611521A1 (de) | 1996-03-23 | 1997-09-25 | Bosch Gmbh Robert | Verfahren und Vorrichtung der Zufuhr von Kraftstoffdampf zu einem Verbrennungsmotor |
US5706789A (en) * | 1996-01-17 | 1998-01-13 | Nippon Soken, Inc. | Vaporized fuel control apparatus and a control method of the same in an internal combustion engine |
US5862795A (en) * | 1996-01-23 | 1999-01-26 | Toyota Jidosha Kabushiki Kaisha | Evaporative control system for a multicylinder internal combustion engine |
EP0972931A2 (de) * | 1998-07-15 | 2000-01-19 | Toyota Jidosha Kabushiki Kaisha | Verfahren und Vorrichtung zum Behandeln von Brennstoffdampf für einen Magermotor |
WO2002012705A1 (de) * | 2000-08-04 | 2002-02-14 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur steuerung der abgabe von kraftstoffdampf aus einem tankentlüftungssystem |
-
2001
- 2001-11-24 DE DE50112195T patent/DE50112195D1/de not_active Expired - Fee Related
- 2001-11-24 EP EP01127980A patent/EP1314879B1/de not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4530210A (en) * | 1981-12-25 | 1985-07-23 | Honda Giken Kogyo K.K. | Apparatus for controlling evaporated fuel in an internal combustion engine having a supercharger |
JPH04252854A (ja) * | 1991-01-29 | 1992-09-08 | Toyota Motor Corp | エンジンの蒸発燃料制御装置 |
US5351193A (en) * | 1991-07-01 | 1994-09-27 | General Motors Corporation | Canister purge control method |
DE4225993C1 (de) * | 1992-08-06 | 1994-01-13 | Freudenberg Carl Fa | Vorrichtung zum vorübergehenden Speichern und dosierten Einspeisen der im Freiraum einer Tankanlage befindlichen flüchtigen Kraftstoffbestandteile in das Ansaugrohr einer Verbrennungskraftmaschine |
US5429098A (en) * | 1993-02-05 | 1995-07-04 | Unisia Jecs Corporation | Method and apparatus for controlling the treatment of fuel vapor of an internal combustion engine |
US5706789A (en) * | 1996-01-17 | 1998-01-13 | Nippon Soken, Inc. | Vaporized fuel control apparatus and a control method of the same in an internal combustion engine |
US5862795A (en) * | 1996-01-23 | 1999-01-26 | Toyota Jidosha Kabushiki Kaisha | Evaporative control system for a multicylinder internal combustion engine |
DE19611521A1 (de) | 1996-03-23 | 1997-09-25 | Bosch Gmbh Robert | Verfahren und Vorrichtung der Zufuhr von Kraftstoffdampf zu einem Verbrennungsmotor |
EP0972931A2 (de) * | 1998-07-15 | 2000-01-19 | Toyota Jidosha Kabushiki Kaisha | Verfahren und Vorrichtung zum Behandeln von Brennstoffdampf für einen Magermotor |
WO2002012705A1 (de) * | 2000-08-04 | 2002-02-14 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur steuerung der abgabe von kraftstoffdampf aus einem tankentlüftungssystem |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 017, no. 031 (M - 1356) 21 January 1993 (1993-01-21) * |
Also Published As
Publication number | Publication date |
---|---|
DE50112195D1 (de) | 2007-04-26 |
EP1314879B1 (de) | 2007-03-14 |
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