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EP0589733B1 - Drosselklappengehäuse mit erweiterbarer Einlassleitung und Verfahren - Google Patents

Drosselklappengehäuse mit erweiterbarer Einlassleitung und Verfahren Download PDF

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Publication number
EP0589733B1
EP0589733B1 EP93402075A EP93402075A EP0589733B1 EP 0589733 B1 EP0589733 B1 EP 0589733B1 EP 93402075 A EP93402075 A EP 93402075A EP 93402075 A EP93402075 A EP 93402075A EP 0589733 B1 EP0589733 B1 EP 0589733B1
Authority
EP
European Patent Office
Prior art keywords
axis
butterfly valve
valve member
passage
butterfly
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
EP93402075A
Other languages
English (en)
French (fr)
Other versions
EP0589733A1 (de
Inventor
Pierre Semence
Michael Pontoppidan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marelli France SAS
Original Assignee
Magneti Marelli France SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9432967&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0589733(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Magneti Marelli France SAS filed Critical Magneti Marelli France SAS
Publication of EP0589733A1 publication Critical patent/EP0589733A1/de
Application granted granted Critical
Publication of EP0589733B1 publication Critical patent/EP0589733B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/104—Shaping of the flow path in the vicinity of the flap, e.g. having inserts in the housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/1055—Details of the valve housing having a fluid by-pass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/107—Manufacturing or mounting details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium

Definitions

  • the present invention relates to a throttle body for a fuel injection device for an internal combustion engine, in particular for an injection device comprising electronic means for controlling the quantity of fuel introduced in each engine operating cycle.
  • the quantity of fuel injected per cycle must be proportional to the air flow admitted to the engine.
  • this air flow is calculated by electronic means from signals indicating on the one hand the degree of opening of the butterfly valve (supplied for example by a potentiometer), on the other hand the pressure difference between the upstream and downstream of the butterfly, representative of the air speed. Satisfactory engine control at low loads (i.e. for small throttle openings) requires that the initial increase in flow be very gradual. In particular, driving pleasure is practically obtained, in the case of an electronically controlled injection device, only with an initial variation of the air flow as a function of the opening angle ⁇ of the butterfly having a shape of the genus shown schematically in thick lines in FIG. 1.
  • butterfly bodies of the type comprising a housing in which is formed an intake duct and a butterfly in the form of a circular or slightly elliptical disc, mounted on a median axis of rotation transverse to the duct. and movable between a minimum open position, possibly zero, and a maximum open position for which the butterfly is oriented parallel to the axis of the duct, the duct having a wall which has a complex shape, so that the passage section offered to the air increases at the start of the opening, as a function of the opening angle of the butterfly, much less rapidly than in the case of a cylindrical conduit.
  • the invention aims in particular to provide a butterfly body that better meets those previously known to the requirements of practice, in particular in that it makes it possible to obtain all the required progressivity laws without however presenting difficulties in production or assembly. throttle or jamming (see EP-A-433518).
  • the invention provides a butterfly body of the type defined above, characterized in that the duct has a straight cylindrical section with a section corresponding to the shape of the butterfly in the latter's minimum open position, s' extending upstream and downstream of said minimum opening position, and present, in upstream and downstream of the cylindrical section and along the path followed by the upstream and downstream sections of the butterfly valve up to a determined opening angle of the latter, respective zones delimited by arcs of circles centered on the axis of the duct intake and decreasing radius from the cylindrical section.
  • the cylindrical section will be of circular section, which corresponds well to the usual forms of butterfly which are either with circular periphery, or with very slightly elliptical periphery when the position of minimum opening, possibly zero, of the butterfly is inclined by relative to a plane perpendicular to the axis of the duct.
  • the axial length of the cylindrical section will be chosen so that, at constant sonic pressure difference between upstream and downstream, the flow rate which passes when the section of the butterfly exceeds, upstream and downstream, the section cylindrical is between 160 and 180% of the flow corresponding to the minimum opening of the butterfly.
  • This flow rate corresponding to the minimum opening can be that which passes through the clearance which remains between the edge of the butterfly and the intake duct, when the closing of the butterfly is limited by a stop so that the butterfly cannot come apply against the wall, or one that passes through a bypass duct providing in particular the flow of idle air.
  • the invention also provides a method for making a relatively simple metal butterfly body of the type defined above.
  • the method comprises the steps of molding a blank having an internal passage having, upstream and downstream of a straight cylindrical section corresponding to a minimum opening position of the butterfly, respective zones, each zone having a section of revolution from that of the sides of the median plane towards which the edge does not move when opening from the minimum opening position and, having opposite side, an area the projection of which towards the axis of the duct increases from the plane containing the throttle axis to the orthogonal plane and containing the throttle axis, and for machining the above-defined zones in the form of arcs circles of decreasing radius from said cylindrical section to the extreme position taken by the butterfly for said determined maximum opening angle.
  • the throttle body which will now be described is designed to obtain a law of variation of the flow rate of the kind shown in FIG. 1.
  • the body shown in FIGS. 2 to 4 comprises a metal housing 10 made by molding and partial machining and a throttle 12 (FIG. 2) fixed in a shaft 14 allowing it to rotate about an axis orthogonal to the axis 16 of an intake duct 18 formed in the housing.
  • the butterfly valve 12 illustrated in FIG. 2 can be moved from the minimum opening position shown in solid lines to a full opening position where it is directed along the axis 16 of the duct 18.
  • the minimum opening position can be fixed by the support of the edge of the butterfly, slightly elliptical in shape, against the wall of the duct, at a location where this wall is cylindrical, for an inclination relative to a plane transverse to the axis 16 of approximately 5 ° .
  • the minimum opening position can also be fixed by an adjustment stop not shown. In this case, the minimum opening angle can be 0 ° or very close to 0 °.
  • the shaft 14 rotates in bearings formed in bosses 20 of the body.
  • One of its ends is fixed to the cursor of an angle sensor such as a potentiometer 22 indicating the angular position of the butterfly.
  • the other end is fixed to a cam 24 to which the throttle control cable hangs.
  • a bypass passage 23 connecting the upstream of the butterfly an outlet 25 located downstream.
  • a solenoid valve for opening it and therefore allowing an additional air flow to pass to that which bypasses the butterfly 12, at least when the latter is in its minimum open position.
  • the intake duct 18 can be viewed as comprising a straight cylindrical central section with circular section 26 and upstream parts (above the butterfly 12 in the case of an inverted butterfly body, where the air circulates in the direction indicated by arrow f) and downstream.
  • the central section 26 has a diameter such that the leaks along the edge of the butterfly 12, when the latter bears against the wall, are very reduced.
  • the height h of this section is chosen so that the flow which passes around the butterfly as soon as the section exceeds, upstream and downstream, the cylindrical section is between 160 and 180% of the sonic flow corresponding to the opening minimum of the butterfly, while the possible bypass passage 22 is closed.
  • the section 26 will be symmetrical with respect to the axis of the butterfly shaft 14.
  • the upstream part of the intake duct 18 is asymmetrical with respect to a plane passing through the axis 16 and through the axis of the shaft 14.
  • Half of the upstream part from which the edge of the butterfly moves apart during the opening (right half in Figure 2) is slightly conical or cylindrical and semi-circular section at each level along the axis 16. The other half, on the contrary, is present at each level z between the upper level z0 of the cylindrical section 26 and a level zm a section of composite shape.
  • This section can be regarded as having a central part constituted by an arc of a circle centered on the axis 16 and of decreasing radius from the level z0 and side parts having a general shape of arc of an ellipse whose major axis is equal, at each level, to that of the section at the same level of the right half and whose minor axis increases from the central section.
  • the minor axis of this ellipse is chosen so that the edge of the butterfly remains entirely along the zone where the cross section is in the form of an arc of a circle, until it reaches the level zm.
  • the butterfly can be mounted easily, even when it has a significant thickness. Indeed, along the plane passing through the axis 16 and the axis of the butterfly shaft 14, there is an insertion path where the transverse dimension of the duct is at least equal to the diameter of the butterfly.
  • line 30 then becomes the place of intersections between successive elementary cylinders and a plane passing through an axis offset from the axis of rotation, in the direction of the axis 16, the offset being substantially equal to half the thickness. of the butterfly.
  • the downstream part of the intake duct has the same constitution as the upstream part. It can be symmetrical with the upstream part. In the case illustrated in Figure 2 it is significantly shorter than the upstream part, for reasons of space of the body.
  • the radii of successive circles i.e. the evolution of the shape for successive opening angles can be developed in a manner known per se on a computer, using software transforming the data of a law of variation of the mass air flow rate as a function of the angle of the butterfly in an upstream form and a downstream form defined by separate coordinates.
  • the software is designed so as to obtain continuity with the parts with a circular or elliptical cross section.
  • the housing is metallic (aluminum for example) and can be produced by pressure molding of a blank of the kind shown in FIG. 5, then machining on a machining center.
  • the blank shown in Figure 5 is achievable without difficulty, with a core in two parts introduced on either side, along the axis. At each level along the axis, the left part above the central cylindrical section and the right part below this section present, at each level along the axis, a form of half-ellipse whose small axis is chosen so that the section just delivers passage to the butterfly when the latter opens.
  • the extra thickness to be removed in the machined areas (represented by screened areas in Figure 2) is indicated in dashed lines in Figure 5.
  • the opening angle ⁇ ( Figure 2) for which the butterfly remains in a machined area will be between 35 and 50 °.
  • the butterfly can then be placed in a conventional manner.
  • the butterfly shaft can be inserted, its slot being oriented in the direction corresponding to the complete opening of the butterfly.
  • the butterfly 12 is slid along the axis.
  • the shaft is rotated so as to bring the butterfly to the minimum open position.
  • the fixing means such as screws, are put in place.
  • the butterfly has dimensions preventing it from arriving at an orientation where it is perpendicular to the axis 16: its position of abutment against the wall of the intake duct 18 makes an angle of a few degrees with the plane orthogonal to the axis 16.
  • the section 26 may be limited to a circular line.
  • the butterfly is arched, that is to say that its two wings form an obtuse angle with respect to each other.
  • One of the wings is designed to bear against the wall of the intake duct at an angle of a few degrees with the plane orthogonal to the axis, while the other wing is then orthogonal to the axis.
  • the section 26 is asymmetrical relative to the plane containing the axis of the butterfly shaft.
  • the invention would also be usable in the case of a butterfly which can rotate 180 ° around its axis, which is a solution sometimes adopted for butterfly bodies whose butterfly is not controlled directly by the driver, but by an engine taking into account various operating parameters and in particular the position of the accelerator pedal.
  • Plastic molding can be done with much more precision than that of metals, a body of the kind described above can advantageously be made of plastic by direct molding of a core.
  • a core In this case it is the external shape of the core which is produced by machining to have the shape defined above.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Claims (6)

  1. Drosselklappengehäuse für eine Kraftstoffeinspritzeinrichtung für einen Verbrennungsmotor mit einem Korpus (10), in dem eine Einlaßleitung (18) vorgesehen ist, und mit einer Drosselklappe (12) in der Form einer kreisförmigen oder leicht etwas elliptischen Scheibe, die an einer quer zu der Leitung verlaufenden mittleren Drehwelle (14) angebracht und zwischen einer Stellung minimaler Öffnung, gegebenenfalls Null, und einer Stellung maximaler Öffnung verstellbar ist, damit die Drosselklappe parallel zur Achse (16) der Leitung ausgerichtet ist, wobei die Leitung eine Wand mit einer komplexen Form derart aufweist, daß der der Luft angebotene Durchtrittsquerschnitt bei Beginn der Öffnung in Abhängigkeit von dem Öffnungswinkel der Drosselklappe viel weniger schnell zunimmt als in dem Fall einer zylindrischen Leitung,
    dadurch gekennzeichnet, daß die Leitung einen geradzylindrischen Abschnitt (26) aufweist, dessen Profil der Form der Drosselklappe in der Stellung minimaler Öffnung der letzteren entspricht, sich stromaufwärts und stromabwärts der Stellung minimaler Öffnung erstreckt und stromaufwärts und stromabwärts des Zylinderabschnitts und entlang der Bahn der Ränder stromaufwärts und stromabwärts der Drosselklappe bis zu einem durch letztere bestimmten Öffnungswinkel Bereiche aufweist, die durch Kreisbögen mit dem Zentrum auf der Achse der Einlaßleitung und ausgehend von dem Zylinderstumpf abnehmendem Radius begrenzt sind.
  2. Drosselklappe nach Anspruch 1, dadurch gekennzeichnet, daß der Zylinderabschnitt ein kreisförmiges Profil aufweist.
  3. Drosselklappengehäuse nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Axiallänge des Zylinderabschnitts (26) eine solche ist, daß bei konstanter Luftdruckdifferenz zwischen der stromaufwärtigen und der stromabwärtigen Seite der Drosselklappe die Menge, die dann, wenn der Rand der Drosselklappe abhebt, stromaufwärts und stromabwärts den Zylinderabschnitt durchströmt, zwischen 160 und 180 % der Menge liegt, die der Minimalöffnung der Drosselklappe entspricht.
  4. Drosselklappengehäuse nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß der Zylinderabschnitt (26) hinsichtlich der Achse der Drosselklappe symmetrisch ist.
  5. Drosselklappengehäuse nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß der Zylinderabschnitt (26) hinsichtlich der Achse der Drosselklappe asymmetrisch ist.
  6. Verfahren zur Herstellung eines Drosselklappengehäuses nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein Rohling mit einem Innenkanal hergestellt wird, der stromaufwärts und stromabwärts eines geradzylindrischen Abschnitts Zonen aufweist, deren jede einen Erweiterungsabschnitt seitlich der Mittelebene aufweist, in Richtung auf den sich der Rand der Drosselklappe beim Öffnen ausgehend von der Stellung minimaler Öffnung nicht verstellt, und an der gegenübeliegenden Seite eine Zone aufweist, deren Vorsprung in Richtung auf die Achse der Leitung von der die Achse der Drosselklappe und die Achse der Einlaßleitung enthaltenden Ebene in Richtung auf die rechtwinklige und die Achse der Drosselklappe enthaltende Ebene zunimmt, und die genannten Zonen zu einer Form von Kreisbögen bearbeitet werden, deren Mittelpunkt auf der Achse der Leitung liegt und deren Radius vom Zylinderabschnitt aus bis zu der von der Drosselklappe eingenommenen Extremstellung für den vorbestimmten Winkel der Maximalöffnung abnimmt.
EP93402075A 1992-08-21 1993-08-19 Drosselklappengehäuse mit erweiterbarer Einlassleitung und Verfahren Expired - Lifetime EP0589733B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9210198A FR2694963B1 (fr) 1992-08-21 1992-08-21 Corps de papillon à conduit d'admission de forme évolutive et procédé de fabrication d'un tel corps.
FR9210198 1992-08-21

Publications (2)

Publication Number Publication Date
EP0589733A1 EP0589733A1 (de) 1994-03-30
EP0589733B1 true EP0589733B1 (de) 1995-10-18

Family

ID=9432967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93402075A Expired - Lifetime EP0589733B1 (de) 1992-08-21 1993-08-19 Drosselklappengehäuse mit erweiterbarer Einlassleitung und Verfahren

Country Status (6)

Country Link
US (1) US5374031A (de)
EP (1) EP0589733B1 (de)
BR (1) BR9303441A (de)
DE (1) DE69300671T2 (de)
ES (1) ES2089756T3 (de)
FR (1) FR2694963B1 (de)

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EP2365200A1 (de) 2010-03-05 2011-09-14 Pierburg GmbH Klappenventil

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JP2019085902A (ja) * 2017-11-02 2019-06-06 株式会社ニッキ 電動式空気量調整装置
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2365200A1 (de) 2010-03-05 2011-09-14 Pierburg GmbH Klappenventil
DE102010010533A1 (de) 2010-03-05 2011-10-06 Pierburg Gmbh Klappenventil
DE102010010533B4 (de) * 2010-03-05 2013-10-10 Pierburg Gmbh Klappenventil

Also Published As

Publication number Publication date
BR9303441A (pt) 1994-03-15
DE69300671T2 (de) 1996-03-21
ES2089756T3 (es) 1996-10-01
FR2694963A1 (fr) 1994-02-25
FR2694963B1 (fr) 1994-10-21
DE69300671D1 (de) 1995-11-23
US5374031A (en) 1994-12-20
EP0589733A1 (de) 1994-03-30

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