EP0585527B1 - Dispositif pour l'alimentation temporaire de carburant évaporé d'un espace libre d'un réservoir dans la tubulure d'admission d'un motor à combustion interne - Google Patents

Dispositif pour l'alimentation temporaire de carburant évaporé d'un espace libre d'un réservoir dans la tubulure d'admission d'un motor à combustion interne Download PDF

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Publication number
EP0585527B1
EP0585527B1 EP93107112A EP93107112A EP0585527B1 EP 0585527 B1 EP0585527 B1 EP 0585527B1 EP 93107112 A EP93107112 A EP 93107112A EP 93107112 A EP93107112 A EP 93107112A EP 0585527 B1 EP0585527 B1 EP 0585527B1
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EP
European Patent Office
Prior art keywords
section
opening cross
nozzle
valve
opening
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
Application number
EP93107112A
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German (de)
English (en)
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EP0585527A1 (fr
Inventor
Andreas Sausner
Sebastian Zabeck
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Carl Freudenberg KG
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Carl Freudenberg KG
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Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
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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
    • F02M25/0809—Judging failure of purge control system
    • 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

Definitions

  • the invention relates to a device for the temporary storage and metered feeding of volatile fuel components located in the free space of a tank system into the intake pipe of an internal combustion engine, comprising a vent line connecting the free space with the atmosphere, in which a storage chamber with an absorption element is arranged, as well as at least one the storage chamber with the intake pipe connecting line, which can be closed by an electromagnetically actuated valve, the valve having at least one inlet and at least one outlet opening and a valve seat being provided between the inlet and the outlet opening, which can be closed if necessary by a closing member .
  • the line can only be closed by the electromagnetically actuated valve, the valve seat forming an axial boundary of a tubular nozzle and the nozzle having a first and a third opening cross section in the region of its axial ends.
  • Such a device is known from US-A-4,830,333.
  • the nozzle has the narrowest passage cross section in the area of its valve seat and is funnel-shaped immediately after the opening cross section of the valve seat to the cross section of the outlet opening, the passage cross section being popular in the axial direction up to the area of the connecting flange.
  • the design of the known nozzle is not very satisfactory from a fluidic point of view.
  • the Internal combustion engine undesirable turbulence, which are disadvantageous for the regeneration of the absorption element.
  • the differential pressure in these load conditions is comparatively low due to the throttle valves being almost fully open.
  • both the opening cross-section and the corresponding closing member are designed to be comparatively large.
  • the actuating forces of the valve increase due to the comparatively large opening cross section and the comparatively large mass of the closing member.
  • the fine metering of the volatile fuel components is therefore disadvantageous in all operating states of the internal combustion engine when the closing element is actuated in a timed manner. If the previously known valve is designed for sufficient regeneration of the absorption element in the full-load range, the mass flow rate in the area close to idling is so great by design that over-greasing is to be feared.
  • auxiliary valve with a control chamber which can be closed by a vacuum adjuster, is additionally arranged between the electromagnetically actuated valve and the intake pipe.
  • the auxiliary valve is immediately connected in series to the shut-off valve.
  • the auxiliary valve comprises a vacuum adjuster, which is composed of a rubber-elastic actuating membrane and a compression spring, the auxiliary valve having a separate closing element, which rests on the one hand with a support collar on the actuating membrane and on the other hand on the compression spring.
  • This configuration ensures that at low operating speeds in the area close to idling, the permeability of volatile fuel components is reduced by the device in order to prevent over-greasing of the mixture and that, at high operating speeds of the internal combustion engine and reduced differential pressure, there is a large total permeability through the check valve.
  • the previously known device consists of a large number of individual parts, which is unsatisfactory from a manufacturing and economic point of view. Due to the large number of individual parts that can move relative to one another, malfunctions can also occur during a long period of use, which could impair the operating behavior of the connected internal combustion engine.
  • the invention has for its object to develop a device of the type mentioned in such a way that there is a significantly simplified structure, that the device is cheaper to manufacture in terms of production technology and economy and that reliable and good performance characteristics result over a long period of use.
  • the first opening cross section of the nozzle in the area of the valve seat is tapered in the flow direction immediately behind the valve seat to a second opening cross section and that the second opening cross section on the side facing away from the valve seat in Flow direction is conically expanded to the third opening cross section, which is larger than the first opening cross section, that the area of the first opening cross section is 1.01 to 2.5 times larger than the area of the second opening cross section, that the area of the third opening cross section 1, 05 to 4 times larger than the area of the second opening cross section, that the nozzle is designed as a Laval nozzle and that the length of the nozzle is 4 to 12 times larger than the diameter of the second opening cross section.
  • the nozzle which has the shape of a Laval nozzle, on the one hand enables good disposal, ie regeneration of the absorption element, at high speeds in the partial and full load range.
  • a high mass flow of the volatile fuel components is fed to the fuel-air mixture of the mixture preparation and is conveyed together with this into the combustion chambers of the internal combustion engine.
  • the shape of the nozzle requires a comparatively high flow rate, so that there is only little flow resistance to the throughput. Due to the favorable design of the nozzle in terms of flow technology, the valve seat can have a comparatively small opening cross section, which requires low actuation forces of the valve.
  • this configuration benefits the regeneration of the absorption element in the area close to idling. Due to the comparatively small opening cross-section of the valve seat and the resulting comparatively low actuation forces of the valve, the valve can be kept in the closed position for a longer period of time when actuated, so that overfatting of the fuel-air mixture can be reliably avoided despite regeneration of the absorption element in the idling region .
  • the connections for actuating the valve can be connected to a diagnostic block.
  • the diagnostic block which can form part of a map of an engine control, for example, controls the actuation of the valve and thus the volume flow of volatile fuel components into the intake pipe of the internal combustion engine depending on various input variables depending on the respective load condition.
  • the electromagnetically actuated valve can, for example, be controlled in a clocked manner and, depending on the pulse duty factor, releases different dosing quantities.
  • the duty cycle is understood to mean the relationship between the period of the open valve and the total period, that is to say the period of the open and the closed valve.
  • the diagnostic block can be connected to a control instrument, for example. If an arbitrarily defined threshold value, which describes the difference between the setpoint value and the actual value of the mass flow that has been passed through, is exceeded, visual and / or acoustic signals can alert the operator of the internal combustion engine to functional errors.
  • the input signals of the diagnostic block can be formed, for example, by the position of the throttle valve, the speed of the internal combustion engine, various temperatures and pressures inside and outside the internal combustion engine and the exhaust gas composition. Additional input and output variables are also conceivable.
  • the first opening cross section and the inlet opening can be arranged in a first plane and / or the third opening cross section can be arranged with the outlet opening in a second plane.
  • the differential pressure due to the almost fully open throttle valve is comparatively low, low flow losses are required in order to ensure good disposal of the absorption element.
  • the first opening cross section preferably has a diameter that is 2 to 8 times, preferably 4 times larger than the stroke of the closing member. A good passage of the volatile fuel constituents through the device is effected at the same time with the smallest possible travel, so that the dynamic range of the electromagnetically adjustable valve is particularly broadband.
  • FIG. 1 An overall overview is shown in FIG. 1, in which the individual parts used are shown in a schematic representation.
  • FIG. 2 shows the electromagnetically actuated valve from FIG. 1.
  • FIG. 3 shows a diagram in which the flow of the volatile fuel components through the device is plotted against the differential pressure which corresponds to the different load ranges of the internal combustion engine.
  • the device shown in FIG. 1 comprises an internal combustion engine 4 with an intake pipe 3, a throttle valve 20, shown enlarged, being arranged within the intake pipe 3.
  • the air filter of the internal combustion engine 4 is provided with the reference number 19.
  • the mixture preparation system is not shown in this figure to simplify the structure. It can consist, for example, of a carburetor or an injection system, which can be controlled via the diagnostic block 21, which can form part of an engine control.
  • the electromagnetically actuated valve 10 is shown only schematically in FIG. 1 and in its outer contours. It has an outlet opening 12 and an inlet opening 11, which is connected via a line 9 to the absorption element 8 of the storage chamber 7.
  • the volatile fuel components from the free space 1 of the tank system 2 reach the storage chamber 7 via a ventilation line 6 and are absorbed by the absorption element 8, which is designed as an activated carbon filter.
  • the line is closed exclusively by the electromagnetically actuated valve 10, which means that a simple construction is required.
  • the volatile fuel components flow through the valve 10, which is actuated at different clocks depending on the respective load state of the internal combustion engine.
  • the fuel components are drawn in by the negative pressure in the intake pipe 3 of the internal combustion engine 4.
  • the volatile fuel components are fed in in the flow direction 16 behind the throttle valve 20.
  • the diagnostic block 21 and the display instrument 22 serve to monitor and control the device according to the invention.
  • the passage of volatile fuel components into the internal combustion engine 4 is regulated depending on input variables, such as the position of the throttle valve 20, the speed of the internal combustion engine 4 and / or the exhaust gas composition.
  • a sensor can be provided to determine the volatile fuel constituents that have penetrated into the intake pipe, and is arranged in the area of the entry point behind the throttle valve 20.
  • FIG. 2 shows an embodiment of the valve 10 from the device according to FIG. 1 as an individual part, enlarged in a section.
  • the valve 10 has an electric drive 23, which is connected in a signal-conducting manner to a diagnostic block, not shown here.
  • the drive 23 regulates the flow, depending on parameters entered in the diagnostic block.
  • the device can only be closed by the valve 10, a nozzle 14 being arranged within the housing 24 of the valve 10, which nozzle, starting from the valve seat 13, which forms a first opening cross section 15, flows in the flow direction 16 directly behind the valve seat 13 Opening cross section 17 tapers, the second opening cross section increasing conically in the direction of flow in the direction of the third opening cross section 18.
  • the cone angle, which the boundary wall of the nozzle 14 encloses with the axis of the nozzle 10, is 4 ° in this exemplary embodiment.
  • the second opening cross section 17 is arranged in the axial direction from the valve seat 13, preferably within the first third of the axial extent of the nozzle.
  • FIG. 3 shows a diagram in which the mass flow m ⁇ is plotted on the ordinate and the pressure difference ⁇ p is plotted on the abscissa. At the intersection of the two axes, the flow m ⁇ is zero, as is the differential pressure ⁇ p. Starting from the zero point of the abscissa to the right, the differential pressures of the negative pressure are shown during the intended use of the internal combustion engine 4.
  • the illustration is a schematic sketch to make the relationships between the respective configurations of the valves clear. Numerical values cannot be derived from the representations.
  • the abscissa to the right of the intersection of the two axes is divided into three areas 29, 30, 31, which symbolize the operating states of the internal combustion engine 4.
  • Area 29 is the no-load area
  • area 30 is the partial load area
  • area 31 is the full load area.
  • the characteristic curves of a valve which is designed similarly to the valve from FIG. 2 but has a nozzle with a cylindrical cross section are given the reference numerals 24 and 25 designated.
  • the characteristic curves of the valve 10 according to the invention shown in FIG. 2 have the reference numbers 26 and 27.
  • characteristic curve 28 The operating behavior of the prior art according to DE-PS 32 02 664 and DE-PS 41 00 659, which has an additional secondary valve seat in addition to the main valve seat, is described by characteristic curve 28.
  • a valve with a cylindrical nozzle has the disadvantages that it can either be operated with a view to maximum disposal of the absorption element in full-load operation without idle regeneration, since with large opening cross-sections and a fully open valve, as shown by characteristic curve 24, over-greasing of the idle operation Fuel air mixture would take place.
  • Characteristic curve 25 shows the smallest possible dosing quantity when the valve is actuated in cycles. It can be seen that the mass flow rate m in the idling area 29 is significantly greater in comparison to the characteristic curves 27 and 28, which indicates an undesirable over-greasing in idling.
  • the valve known from the prior art which consists of an auxiliary valve seat and a main valve seat, has a characteristic curve which is provided with reference number 28.
  • the valve can be almost closed by the vacuum adjuster in order to limit the mass flow rate of volatile fuel components in the area between throttle valve 20 and internal combustion engine 4.
  • the comparatively complicated structure allows sensitive metering of the volatile fuel components into the internal combustion engine in the area 29 close to idling and, on the other hand, a comparatively high mass throughput m at part load operation 30 and full load 31.
  • the valve 10 according to the invention has a mass flow rate in the fully open state (characteristic curve 26) which is only slightly below the mass flow rate of a cylindrical nozzle with a large opening cross section. Due to the reduced flow losses, the high mass throughput is maintained well into the full load range. With clocked activation of the valve for sensitive metering of the volatile fuel components in operation 29 near idling, the characteristic curve shown with reference number 27 is reached.
  • valve according to FIG. 2 which has a very simple construction and is economical to produce economically, achieves excellent usage properties both with regard to the maximum throughput when the valve is fully open and with sensitive metering in the region 29 close to idling can be.

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  • 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)
  • Fuel-Injection Apparatus (AREA)
  • Feeding And Controlling Fuel (AREA)

Claims (6)

  1. Dispositif pour l'accumulation temporaire et l'alimentation dosée de composantes de carburant évaporées se trouvant dans l'espace libre (1) d'un réservoir (2) dans la tubulure d'admission (3) d'un moteur à combustion interne (4), ce dispositif comprenant une conduite d'aération (6) reliant l'espace libre (1) à l'atmosphère (5) et dans laquelle est située une chambre d'accumulation (7) contenant un élément d'absorption (8), et comprenant au moins une conduite (9) reliant la chambre d'accumulation (7) à la tubulure d'admission (3), laquelle conduite (9) peut être fermée par une soupape (10) à commande électromagnétique, la soupape (10) comportant au moins une ouverture d'entrée (11) et au moins une ouverture de sortie (12) et un siège de soupape (13) qui peut, facultativement, être fermé par un élément de fermeture, étant prévu entre l'ouverture d'entrée (11) et l'ouverture de sortie (12), la conduite (9) ne pouvant être fermée que par la soupape (10) à commande électromagnétique exclusivement, le siège de soupape (13) formant une limite axiale d'une tuyère (14) de forme tubulaire et la tuyère (14) étant pourvue, dans la région de ses extrémités axiales, d'une première (15) et d'une troisième (18) sections d'ouverture, ce dispositif étant caractérisé en ce que, dans la région du siège de soupape (13), la première section d'ouverture (15) de la tuyère (14) est rétrécie, immédiatement derrière le siège de soupape (13), dans le sens de l'écoulement (16), jusqu'à donner une deuxième section d'ouverture (17), et que, du côté éloigné du siège de soupape (13), la deuxième section d'ouverture (17) est élargie en forme de cône, dans le sens de l'écoulement (16), jusqu'à donner la troisième section d'ouverture (18), laquelle est plus grande que la première section d'ouverture (15); que l'aire de la première section d'ouverture (15) est de 1,01 à 2,5 fois plus grande que l'aire de la deuxième section d'ouverture (17), que l'aire de la troisième section d'ouverture (18) est de 1,05 à 4 fois plus grande que l'aire de la deuxième section d'ouverture (17), que la tuyère (14) est formée par une tuyère de Laval et que la longueur de la tuyère (14) est 4 à 12 fois plus grande que le diamètre de la deuxième section d'ouverture (17).
  2. Dispositif selon la revendication 1, caractérisé en ce que la tuyère (14) a une section d'ouverture sensiblement circulaire.
  3. Dispositif selon les revendications 1 à 2 , caractérisé en ce que la première section d'ouverture (15) et l'ouverture d'entrée (11) sont situées dans un premier plan.
  4. Dispositif selon les revendications 1 à 3, caractérisé en ce que la troisième section d'ouverture (18) et l'ouverture de sortie (12) sont situées dans un deuxième plan.
  5. Dispositif selon les revendications 1 à 4, caractérisé en ce que les première (15), deuxième (17) et troisième (18) sections d'ouverture sont conçues de manière à passer de l'une à l'autre de manière continue, sans modifications brusques de la section de la tuyère (14).
  6. Dispositif selon les revendications 1 à 5, caractérisé en ce que la première section d'ouverture (15) a un diamètre qui est 2 à 8 fois plus grand que la levée de la soupape (10).
EP93107112A 1992-09-01 1993-05-03 Dispositif pour l'alimentation temporaire de carburant évaporé d'un espace libre d'un réservoir dans la tubulure d'admission d'un motor à combustion interne Expired - Lifetime EP0585527B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4229110A DE4229110C1 (de) 1992-09-01 1992-09-01 Vorrichtung zum vorübergehenden Speichern und dosierten Einspeisen von im Freiraum einer Tankanlage befindlichen flüchtigen Kraftstoffbestandteilen in das Ansaugrohr einer Verbrennungskraftmaschine
DE4229110 1992-09-01
US08/115,375 US5460137A (en) 1992-09-01 1993-09-01 Apparatus for the temporary storage and controlled feeding of volatile fuel components to an internal combustion engine

Publications (2)

Publication Number Publication Date
EP0585527A1 EP0585527A1 (fr) 1994-03-09
EP0585527B1 true EP0585527B1 (fr) 1995-07-26

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EP93107112A Expired - Lifetime EP0585527B1 (fr) 1992-09-01 1993-05-03 Dispositif pour l'alimentation temporaire de carburant évaporé d'un espace libre d'un réservoir dans la tubulure d'admission d'un motor à combustion interne

Country Status (7)

Country Link
US (1) US5460137A (fr)
EP (1) EP0585527B1 (fr)
JP (1) JP2528256B2 (fr)
BR (1) BR9303260A (fr)
CA (1) CA2105363C (fr)
DE (2) DE4229110C1 (fr)
ES (1) ES2076045T3 (fr)

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EP0864741A2 (fr) 1997-03-11 1998-09-16 Pierburg Aktiengesellschaft Dispositif pour rincer un filtre à charbon actif et pour tester l'étanchéité d'une instllation de réservoir à carburant pour moteur de véhicule connectée à ce filtre
US6666192B2 (en) 2001-11-14 2003-12-23 Delphi Technologies, Inc. Fluid control valve and system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0864741A2 (fr) 1997-03-11 1998-09-16 Pierburg Aktiengesellschaft Dispositif pour rincer un filtre à charbon actif et pour tester l'étanchéité d'une instllation de réservoir à carburant pour moteur de véhicule connectée à ce filtre
US5975062A (en) * 1997-03-11 1999-11-02 Pierburg Ag Apparatus and method for periodically cleaning a charcoal canister and for periodically checking leak-tightness of a fuel system of an internal combustion engine
US6666192B2 (en) 2001-11-14 2003-12-23 Delphi Technologies, Inc. Fluid control valve and system

Also Published As

Publication number Publication date
DE59300407D1 (de) 1995-08-31
ES2076045T3 (es) 1995-10-16
CA2105363A1 (fr) 1994-03-02
JPH06159165A (ja) 1994-06-07
JP2528256B2 (ja) 1996-08-28
BR9303260A (pt) 1994-03-22
DE4229110C1 (de) 1993-10-07
CA2105363C (fr) 1999-12-28
EP0585527A1 (fr) 1994-03-09
US5460137A (en) 1995-10-24

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