EP1314879B1 - Procédé de commande de distribution de vapeur de carburant d'un système de ventilation de réservoir - Google Patents
Procédé de commande de distribution de vapeur de carburant d'un système de ventilation de réservoir Download PDFInfo
- Publication number
- EP1314879B1 EP1314879B1 EP01127980A EP01127980A EP1314879B1 EP 1314879 B1 EP1314879 B1 EP 1314879B1 EP 01127980 A EP01127980 A EP 01127980A EP 01127980 A EP01127980 A EP 01127980A EP 1314879 B1 EP1314879 B1 EP 1314879B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control valve
- opening time
- intake port
- fuel vapour
- cylinder
- 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 - Lifetime
Links
Images
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
-
- 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 in a preferably cylinder-individual intake passage of an internal combustion engine, wherein a control valve synchronized fuel vapor can reach the intake stroke of the engine cylinder in the associated intake.
- a control valve synchronized fuel vapor can reach the intake stroke of the engine cylinder in the associated intake.
- Tank venting valve determines which is preferably designed as a metering valve and in the other (and in the claims) is generally referred to as a control valve.
- control valve controlling the control unit In order to allow the control valve controlling the control unit to recognize the behavior of the entire system and to respond appropriately, i.
- the control valve also continue to control suitable and thereby determine its opening time and its opening time suitably, is provided according to claim 1 that considered over several consecutive cycles of a cylinder and starting from a first delivery of fuel vapor into the intake of the opening time for the following work increasingly from a Lower negative pressure in the intake passage is moved to a region with higher negative pressure in the intake passage.
- the reference numeral 1 designates a cylinder of a reciprocating internal combustion engine (not shown), in the combustion chamber 2 of which fresh gas provided with fuel can be supplied for combustion via a suction channel 4 closable by an inlet valve 3.
- a throttle valve 5 or the like is further provided by means of which the combustion chamber 2 supplied amount of fresh gas can be influenced.
- a tank venting system designated in its entirety by the reference numeral 6 is provided.
- the fuel vapors produced in a fuel tank 7 can be intermediately stored in an activated carbon filter 8, which is suitably connected to the fuel tank 7.
- This activated carbon filter 8 must of course also be emptied or rinsed again, whereby from the environment a so-called.
- Purge air flow through the activated carbon filter 8 is passed, which absorbs fuel vapor and this via a purge line 9 in the intake passage 4 of the engine cylinder 1 downstream of the Throttle 5 initiates, so that these fuel vapors eventually burned in the combustion chamber 2 (and thus can be used).
- control valve 10 also called tank vent valve
- this control valve 10 is suitably controlled for this purpose.
- the illustrated time span essentially extends over an intake stroke of the cylinder 1, during which the intake valve 3 is opened, so that fresh gas is sucked into the combustion chamber 2 through the intake passage 4.
- the opening time of the control valve 10 is preferably placed in a region in which a higher negative pressure prevails in the intake channel 4 , while for the control or dosage of smaller amounts of fuel vapor, the opening time is placed in a range in which there is already a lower negative pressure in the intake passage 4.
- the control valve 10 is opened, for example, at time t 1 , since there is a greater driving pressure gradient than at later time t 2 , to which, for example, in the second-mentioned Case (ie lower 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 passage 4 in a simple manner even in a relatively short opening period .DELTA.t is advantageously in the second case, namely opening at the time t 2, a more precise dosage of the charged amount of fuel vapor (and purge air) possible.
- a finer dosage can be achieved by changing the opening duration .DELTA.t in the order of magnitude of, for example, 10.degree the scavenging air quantity take place, as at an earlier time, for example t 1 shortly after opening of the inlet valve 3.
- the closing time of the control valve 10 is also variable, it being advantageous is now possible with the method according to the invention that this is not opened at all or is when there is overpressure in the intake passage.
- the opening time of the control valve 10 for the following work increasingly from a range of lower negative pressure in the intake duct in a region with higher negative pressure in Intake channel shifted. Namely, as already mentioned, rinsing of the activated carbon filter 8 can not be performed in all operating points of the internal combustion engine. Now, if this purging started or started, there is of course a so-called. First time delivery of fuel vapor in the intake passage 4, which is to take place as proposed relatively late in the intake stroke of the cylinder, so that the control valve 10, for example, open at the opening time t 2 shall be.
- control valve 10 In the subsequent work cycles or intake cycles of this cylinder 1, the control valve 10 is then increasingly in areas of higher negative pressure in the intake, ie towards the opening time t 1 out to allow the control valve 11 the control unit 11 to control the behavior of the overall system to recognize and to be able to respond, ie continue to control the control valve 10 suitably and thereby suitably determine its opening duration ⁇ t and its opening time.
- the control unit 11 receives appropriate 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 analyzed.
- the unavoidable opening delay of the control valve 10 can also be taken into account or compensated, ie the time period which elapses between a corresponding actuation of the control valve 10 and its actual opening.
- This proposed control advantageously allows the use of control valves with a comparison with previously known systems higher static flushing quantity or basic flow rate. This makes it possible to combine the dosing of a small control valve and the high purging volume of a large control valve without disadvantages. Furthermore, there is the possibility of a cylinder-selective and working-cycle-selective Metering of the described by the control valve 10 and tank vent valve and the other advantages.
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)
Claims (5)
- Procédé de commande de la distribution de la vapeur de carburant provenant d'un système de ventilation de réservoir (6) à un canal d'admission (4) propre à un cylindre d'un moteur à combustion interne, selon lequel une soupape de commande (10) fait parvenir la vapeur de carburant au canal d'admission (4) associé, en synchronisme avec le cycle d'admission du cylindre (1) du moteur à combustion interne, l'instant d'ouverture de la soupape de commande (10) pouvant varier,
caractérisé en ce qu'
en considérant plusieurs cycles successifs d'un cylindre (1) et en partant d'un premier passage de vapeur de carburant dans le canal d'admission (4), l'instant d'ouverture pour les cycles suivants est décalé en augmentant d'une zone à faible dépression dans le canal d'admission à une zone à dépression plus élevée. - Procédé selon la revendication 1,
caractérisé en ce que
pour commander et doser de plus grandes quantités de vapeur de carburant, l'instant d'ouverture est placé dans une zone où une dépression plus élevée règne dans le canal d'admission (4), tandis que pour commander et doser de plus faibles débits de vapeur de carburant, l'instant d'ouverture est placé dans une zone où règne déjà une dépression plus faible dans le canal d'admission (4). - Procédé selon la revendication 1 ou 2,
caractérisé en ce qu'
l'instant de fermeture de la soupape de commande (10) est également variable, celle-ci ne s'ouvrant pas ou n'étant pas ouverte quand règne une surpression dans le canal d'admission (4). - Procédé selon une des revendications précédentes,
caractérisé en ce qu'
en considérant plusieurs cycles successifs d'un cylindre (1), la quantité de carburant amenée à ce cylindre, à partir du système de ventilation de réservoir (6), est modifiée par variation de l'instant d'ouverture de la soupape de commande, ou de cet instant d'ouverture et aussi de l'instant de fermeture de cette soupape, de cycle à cycle, de manière à améliorer la douceur de fonctionnement ou le comportement dynamique du moteur. - Procédé selon une des revendications précédentes,
caractérisé en ce que
dans un moteur polycylindrique à combustion interne, par variation de l'instant d'ouverture de la soupape de commande, ou de cet instant d'ouverture et aussi de l'instant de fermeture de cette soupape, une quantité différente de carburant provenant du système de ventilation de réservoir (6) est amenée aux cylindres individuels.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01127980A EP1314879B1 (fr) | 2001-11-24 | 2001-11-24 | Procédé de commande de distribution de vapeur de carburant d'un système de ventilation de réservoir |
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 (fr) | 2001-11-24 | 2001-11-24 | Procédé de commande de distribution de vapeur de carburant d'un système de ventilation de réservoir |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1314879A1 EP1314879A1 (fr) | 2003-05-28 |
EP1314879B1 true EP1314879B1 (fr) | 2007-03-14 |
Family
ID=8179342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01127980A Expired - Lifetime EP1314879B1 (fr) | 2001-11-24 | 2001-11-24 | Procédé de commande de distribution de vapeur de carburant d'un système de ventilation de réservoir |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1314879B1 (fr) |
DE (1) | DE50112195D1 (fr) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58110853A (ja) * | 1981-12-25 | 1983-07-01 | Honda Motor Co Ltd | 過給機付内燃機関における蒸発燃料制御装置 |
JP2936746B2 (ja) * | 1991-01-29 | 1999-08-23 | トヨタ自動車株式会社 | 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 |
JP2860851B2 (ja) * | 1993-02-05 | 1999-02-24 | 株式会社ユニシアジェックス | 内燃機関の蒸発燃料制御装置 |
JPH09195864A (ja) * | 1996-01-17 | 1997-07-29 | Nippon Soken Inc | 内燃機関の蒸発燃料処理装置 |
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 |
JP3503479B2 (ja) * | 1998-07-15 | 2004-03-08 | トヨタ自動車株式会社 | 希薄燃焼内燃機関の蒸発燃料処理装置 |
DE10038243B4 (de) * | 2000-08-04 | 2005-07-21 | Bayerische Motoren Werke Ag | 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/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
EP1314879A1 (fr) | 2003-05-28 |
DE50112195D1 (de) | 2007-04-26 |
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