WO2009129968A1 - Dispositif de guidage d'air de combustion - Google Patents

Dispositif de guidage d'air de combustion Download PDF

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Publication number
WO2009129968A1
WO2009129968A1 PCT/EP2009/002833 EP2009002833W WO2009129968A1 WO 2009129968 A1 WO2009129968 A1 WO 2009129968A1 EP 2009002833 W EP2009002833 W EP 2009002833W WO 2009129968 A1 WO2009129968 A1 WO 2009129968A1
Authority
WO
WIPO (PCT)
Prior art keywords
throttle body
outer contour
air duct
throttle
combustion air
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.)
Ceased
Application number
PCT/EP2009/002833
Other languages
German (de)
English (en)
Inventor
Rudolf Prem
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.)
KTM Sportmotorcycle AG
Original Assignee
KTM Sportmotorcycle AG
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
Application filed by KTM Sportmotorcycle AG filed Critical KTM Sportmotorcycle AG
Publication of WO2009129968A1 publication Critical patent/WO2009129968A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • F02D9/1005—Details of the flap
    • F02D9/101—Special flap shapes, ribs, bores or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/222—Shaping of the valve member

Definitions

  • the present invention relates to a combustion air guiding device for an internal combustion engine, having an air duct and a throttle valve pivotally arranged within the air duct, the outer contour of which is designed to be complementary to the inner contour of the air duct.
  • a generic combustion air guiding device of the internal combustion engine is supplied to the required air for combustion.
  • the throttle valve By means of the throttle valve, the passage cross section of the air duct can be increased or decreased.
  • the angle which the throttle takes in relation to a vertical axis perpendicular to the longitudinal center axis of the air duct the cross-sectional area of the air duct that is released by the throttle for the air passage changes.
  • an engine control unit is the Internal combustion engine then assigned the required amount of fuel, which is then injected via injectors, for example, cylinder selectively.
  • An influencing criterion for the power development of the internal combustion engine is the starting opening angle or flap basic angle of the throttle valve in the air duct. This is the angle that the throttle assumes relative to the aforementioned vertical axis in the unactuated position of the throttle.
  • the throttle valve is exposed in the air duct due to the prevailing fluid dynamics in both directions of the air duct acting dynamic gas forces that are taken into account in the design of the throttle and that cause the throttle must have a certain minimum thickness, so that it has sufficient strength values for the gas forces acting on it.
  • the pivotable mounting of the throttle flap in the air duct is usually implemented via a shaft which is mounted in the air duct.
  • the aforementioned valve base angle of, for example, 8.5 degrees is now required to avoid a geometrical collision of the outer peripheral portion of the throttle body of the throttle valve with the inner peripheral wall of the air guide passage. If it comes to such a geometric collision, this leads to a sticking of the throttle body in the air duct, which must be avoided in any case, as this means that the throttle body can no longer or only with great forces solved and thus can be opened , In addition, the sticking would lead to attrition on the throttle body and the inner peripheral wall of the air duct.
  • This 8.5 degree angle results from a caliper thickness of 1.2 mm determined for strength reasons and a diameter of the 10 mm shaft provided for actuating the throttle.
  • a smaller valve base angle results in the given configuration to an unwanted physical contact between the throttle valve and the air duct.
  • a flap with a smaller thickness is disadvantageous because it is prone to damage in the event of Backfiring the engine and then replaced.
  • the driver passes over a bump in the shape of, for example, bumps, a roadway, a manhole cover, railroad tracks, or the like, this results in a corresponding reaction of the chassis of the motorcycle and a momentary impulse response of the driver's center of gravity in the direction of vehicle axis.
  • the driver adheres to the steering device, such as the handlebar of the motorcycle, so that transmits the impulse response to the throttle grip.
  • the driver should hold the throttle grip only jocker and not cramped, for example, to get signaled changes in the road conditions on the front wheel and the chassis of the motorcycle, but the impulse response is still transmitted to the throttle grip.
  • the throttle grip is used to change the throttle angle, so that the impulse response causes - although this is not desired in the described driving situations - the throttle angle is increased briefly and the high-dynamic engine with a, a step response similar moments nantrain responded.
  • an aggressive response of the motorcycle engine could be counteracted in the partial load range, for example, by a significant increase in the rotational inertia of the crankshaft of the motorcycle engine, such an approach would lead to unwanted sluggish engine behavior throughout the speed range.
  • Such an aggressive response of the motorcycle engine in the partial load range now occurs regardless of the shape of the throttle body. Decisive for this problem is the flap base angle described above, which is structurally conditioned and ensures that a sticking of the throttle body in the air duct is avoided due to the described geometric collision of the throttle body and air duct.
  • Throttle body is to be achieved that at low load conditions and low speeds, a swirl flow is formed, which should improve the cylinder filling in the low speed range.
  • Throttle body a cutout, which ensures a cylinder filling even when the throttle valve is closed.
  • a combustion air guiding device which has a throttle body, which also has a cutout, in order to be able to realize a tumble flow.
  • This document describes the problem that sticking of the throttle body in the intake air passage may occur if the throttle body is not mounted with high accuracy in the intake air passage.
  • the object of the present invention is to provide a combustion air guiding device for an internal combustion engine which ensures harmonic power development of the internal combustion engine equipped therewith and avoids the undesirable aggressive behavior of the internal combustion engine in the partial load range.
  • the invention now provides a combustion air ducting device for an internal combustion engine, with an air duct and a pivotally mounted within the air duct duct throttle whose outer contour is formed complementary to the inner contour of the air duct, wherein the throttle has a throttle body having a configuration in a plan view with curved and of Having a semicircular configuration deviating outer contour segments.
  • the throttle body can be arranged in a rectilinear region of the air duct, ie a region without, for example, a flow disturbing step-shaped heel in the air duct and the throttle body is designed so that it Has curved segments formed on the entire outer circumference.
  • the design of the throttle body with curved segments formed on the outer circumference ensures that the throttle body angle compared to the basic angle can be significantly reduced in known throttle body without a sticking of the throttle body is to be feared in the air duct, since the curvature of the outer contour segments of the throttle body of deviates from a semicircular configuration, which would lead to that would have to be set to avoid abrasion between the throttle body and the air duct, the above-described known basic throttle angle.
  • valve base angle ie the angle
  • the throttle body in its normal position - the opening cross section of the air duct largely largely occluding default position - occupies significantly reduced compared to the known valve base angle of 8.5 degrees can be.
  • valve base angle The smaller the valve base angle, the lower the increase in the opening cross section in the air duct over the opening angle, the lower the increase in the opening cross section with an increase in the opening angle.
  • the configuration of the throttle body according to the invention now ensures that the flap base angle or throttle start angle, compared with the corresponding angle can be significantly reduced in a known configuration with semicircular Au- .kontursegmenten the throttle body, so that a driver unintentional rotational movement on the throttle grip leads to a continuation of the smooth and harmonious ride of the motorcycle, as otherwise adjusting sudden increase of the internal combustion engine provided output torque fails.
  • the throttle body has an elongated configuration with first outer contour segments and second, longer outer contour segments and the first and second outer contour segments are each connected by third technicallykontursegmente whose radius of curvature is smaller than the radii of curvature of the first and second outer contour segments.
  • This throttle body therefore has an elongate oval shape, but is formed curved along the entire outer circumference.
  • the second, longer outer contour segments have a greater radius of curvature than the first, shorter outer contour segments and between a respective first and second outer contour segment, a third outer contour segment is provided, which connects the two first outer contour segments and has a greater curvature as the first two outer contour segments.
  • the transition region between the outer contour segments is in each case formed tangentially.
  • the throttle body is of constant thickness along its entire areal extent. This makes it possible to provide a throttle body which has sufficient rigidity with respect to the gas dynamic forces occurring in the air duct.
  • the configuration with all-round curved outer areas on the circumference of the throttle body ensures that when centering the throttle body in the air duct a centering effect arises, so that a precise alignment of the throttle body is given in the air duct.
  • the throttle body according to the invention has curved outer contour segments on the entire outer circumference, wherein the radius of curvature of the outer contour segments is selected so that the first and second Outer contour segments approach a straight-line course, but not take the straight line course.
  • the respective center of curvature of the first and second outer contour segments lies outside the outer peripheral region of the throttle body. It is thereby achieved that the first and second outer contour segments, although curved, have a slight curvature and a configuration of the first and second outer contour segments which is similar to a rectilinear elongate configuration, but which are still curved.
  • the curved, first and second outer contour segments are each connected to each other by third outer contour segments with a respective tangential transition, wherein it is provided according to a development of the invention that the respective center of curvature of the third outer contour segments lies within the outer peripheral region of the throttle body.
  • the third outer contour segments therefore have a curvature which is greater than the curvature of the first and second outer contour segments, the curvature of the first In turn, the outer contour segment is larger than the curvature of the second outer contour segment.
  • the throttle body has a receptacle for a shaft, by means of which the throttle body can be stored and / or actuated relative to the air duct.
  • the receptacle can be formed in a simple case of two holes, which are designed to receive bolts, over which the throttle body can be releasably secured to a shaft, the shaft via the throttle grip directly or indirectly operated with the interposition of an actuator can, in turn, accordingly be controlled by the engine control unit, for example, to be called, so that it actuates the shaft and thus the throttle body in dependence on the rotational angle position of the throttle grip.
  • the throttle valve body is formed symmetrically and has a receptacle for the shaft in the region of an axis of symmetry, by means of which the throttle body can be stored and / or actuated relative to the air duct.
  • the angular position of the shaft and thus the throttle body is monitored with a sensor.
  • the internal combustion engine is assigned by the engine control unit fuel as a function of the open for the supply of combustion air to the internal combustion engine opening cross-section in the air duct.
  • the determination and thus metering of the supplied fuel can be made more accurate, the more accurate the opening cross-section can be determined.
  • the opening cross section in turn is a function of the opening angle of the throttle body relative to the perpendicular to the longitudinal central axis of the air duct extending vertical axis.
  • the configuration of the throttle body according to the invention now ensures that the flap base angle is smaller than the flap base angle of the known throttle body.
  • the opening angle range detected by the rotation angle sensor for determining the opening cross section is greater than in the known throttle body.
  • the configuration of the throttle body according to the invention now ensures that this flap base angle can be reduced to values smaller than 8.5 degrees, for example 2.5 degrees to 4.5 degrees.
  • the configuration of the throttle body according to the invention is particularly advantageous in an internal combustion engine which has more than one inlet valve and the air duct is formed in the area in front of the inlet valves with a branch which divides the air duct into two independent air ducts, each air duct independent Inlet valve is assigned.
  • the configuration of the throttle body according to the invention can be chosen such that the outer symmetrical to the short symmetry axis outer contour segments are curved, the training but deviates from a semicircular configuration guration and these curved outer contour segments are interconnected via the longitudinal axis of the Dro ⁇ selklappen stressess symmetrical outer contour segments, which in turn curved are formed.
  • the throttle body according to the invention has an outer contour which is formed curved along the outer contour everywhere, this configuration has the advantage that due to the curved outer contour segments of the throttle body, which is arranged in an air duct, whose inner contour is complementary to the outer contour of the throttle body , An independent centering of the throttle body in the air duct arises, which is with respect to the assembly of the throttle body in the air duct of advantage.
  • the throttle body according to the invention may be designed so that it looks barrel-shaped in a longitudinal sectional view like a barrel provided with a domed lid and bottom.
  • the throttle body thus formed is viewed in a sectional view enclosing the axis of symmetry, then this has a curved design along its entire outer contour, which looks like a section through a barrel whose cover and bottom are curved outwards, for example due to internal pressure.
  • the throttle body formed in this way has centering surfaces on its entire outer peripheral area which are used for automatic centering of the valve body in the air duct during its assembly.
  • FIG. 1 shows an embodiment of the combustion air guiding device according to the invention in a sectional view
  • FIG. 2 shows representations of the throttle body according to FIG. 1 in a plan view and a sectional view according to A-A;
  • FIG. 3 is an enlarged view of the throttle body according to FIG. 2;
  • FIG. and Fig. 4 is a graphical representation of the opening cross-section, plotted against the opening angle at different flap base angles.
  • Fig. 1 of the drawing shows in a sectional view a schematic representation of a combustion air guiding device 1 according to the present invention.
  • the air duct 2 has a longitudinal center axis 5 and a vertical axis 6 standing at right angles thereto.
  • throttle body 4 has a vertical axis or axis of symmetry 7, which occupies a valve base angle ⁇ of 4.5 degrees in the illustrated in Fig. 1 of the drawing closed position of the throttle valve 3 with the vertical axis 6.
  • the throttle body 4 has an outer contour that is complementary to the inner contour of the air duct 2 formed.
  • the throttle body 4 is formed barrel-shaped, accordingly, the inner contour of the air duct 2 in a sectional view is barrel-shaped.
  • Fig. 2 of the drawing shows in the left-hand illustration a plan view of the barrel-shaped throttle body 4 according to Fig. 1 and in the right-hand illustration a section according to AA.
  • the throttle body 4 has a curved outer contour 9 on its entire outer circumference. Via bores 10, which are provided in the region of the axis of symmetry 7, the throttle body 4 can be fixed by means of bolts, not shown, to the shaft 11 of an actuating device shown in FIG.
  • FIG. 2 corresponds to the section "A-A" from the left-hand illustration of FIG. 2.
  • region 12 within the outer contour 9 is a region of constant thickness.
  • the configuration of the throttle body 4 corresponding to an elongated oval may be used, for example, when the cylinder of the internal combustion engine, which is supplied with combustion air via the combustion air guiding device according to the invention, has two inlet valves.
  • the air duct 2 divides in the direction of the arrow P downstream of the throttle body 4 in two air ducts, which supply combustion air to a respective inlet valve.
  • the throttle body 4 shown in the figures of the drawing has an overall barrel-shaped configuration. As can be seen in more detail with reference to FIG. 3, this is composed of curved first outer contour segments 14 and likewise curved second outer contour segments 15 and curved third outer contour segments 22 which form an outer peripheral line 16.
  • the first outer contour segments 14 have a radius of curvature Ri which is so large that the associated center of curvature outside the outer peripheral line 16 of the throttle body 4 comes to rest.
  • the outer contour segments 15 have a radius of curvature R 2 , which is greater than the radius of curvature Ri of the outer contour segments 14 and therefore also outside the outer peripheral line 16 of the throttle body 4 comes to rest.
  • the curved outer contour segments 14 and 15 provide for an automatically centering effect which permits easy mounting of the throttle body 4 in the air duct 2 ensures that the throttle body 4 automatically aligns at its contact points 17 with the inner peripheral surface 13 of the Lucas arrangementska- channel 2 and centered.
  • the throttle body 4 can come into contact with the inner peripheral surface 13 of the air duct 2 at its basic position, which largely corresponds to the basic position shown in FIG. 1 of the drawing and form a flap base angle ⁇ of less than 5 degrees, for example, a flap base angle ⁇ in the range of 2 , 5 to 4.5 degrees.
  • the large radii on the outer contour segments 15 provide for an automatically adjusting centering of the throttle body 4 in the air duct 2 and the also curved outer contour segments 14 ensure that even with the large, occurring during operation of the engine temperature ranges corresponding expansion of the throttle body. 4 cause no jamming of the throttle body 4 in the air duct 2 occurs in its extension.
  • Each of the first and second outer contour segments 14, 15 is adjoined by a third outer contour segment 22, which encloses the respective first and second outer contour segments 14, 15 connects, wherein the transition region between the first 14 and third 22 and second 15 and third 22 outer contour segments is each formed tangentially.
  • the throttle body 4 is formed with different long major axes due to its barrel-shaped configuration, and the resulting elongated configuration provides for a streamlined transition in the air guide passage between the throttle body and the intake valves of the internal combustion engine.
  • Fig. 4 of the drawing now shows a graph of the opening cross-section plotted against the opening angle at different flap base angles.
  • the reference numeral 18 denotes a curve of the opening cross section plotted against the opening angle at a valve base angle of 8.5 degrees, which corresponds to the known throttle valve position. As it easily appears- Lich, a slight change in the opening angle of, for example, 3 degrees leads to an opening cross section in the air duct 2 of about 28 mm 2 .
  • Such an opening angle of 3 degrees corresponds to a corresponding actuation of the throttle grip of the motorcycle, not shown, and leads to a significant increase in the output of the engine of the motorcycle output torque. If this happens in a manner not intended by the driver of the motorcycle, for example when driving over a roadway heel, the driver then reacts with an immediate closing of the throttle grip, which leads to the engine changing over from the towing mode to the overrunning mode, resulting in an inharmonious driving style motorcycle.
  • the combustion air guiding device according to the invention is used on the same internal combustion engine, then a basic valve angle of, for example, 4.5 degrees arises, from which the curve 19 shown in FIG. 4 of the drawing results.
  • the throttle body according to the invention can be configured such that a valve base angle of 2.5 degrees can be set, which leads to a progression of the engine Aperture cross section plotted against the opening angle according to the curve
  • the opening area in the air duct becomes even smaller than that of the curve 19, which corresponds to a throttle angle of 4.5 degrees.
  • Such a configuration according to the curve 20 is provided, for example, in an internal combustion engine, which compared to the internal combustion engine, for which the curve 19 is provided, a still significantly steeper increase in the output torque as a function of the opening angle shows, so for example even more dynamic and more output having internal combustion engine.
  • FIG. 4 of the drawing shows a curve 21 which is plotted against the course of the opening cross section over the opening angle in the case of a flap base angle! of 0 degrees.
  • This course is only for reference purposes and to illustrate that due to the displacement of the curves 19 and 20 from the curve 18 away in the direction of the curve
  • combustion air guide device 21 can be reduced by the combustion air guide device according to the invention at the same opening angle of the opening cross section in the air duct to bring about a harmonious power delivery of the highly dynamic internal combustion engine, especially in the partial load range, so that a not intentionally caused by the driver significant increase in engine torque can be avoided.

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

Abstract

Dispositif de guidage d'air de combustion (1) pour un moteur à combustion interne, comportant un conduit d'air (2) dans lequel est logé pivotant un papillon d'étranglement (3) dont le contour externe est complémentaire du contour interne du conduit d'air (2). Le papillon d'étranglement (3) comporte un corps (4) qui, vu de dessus, a une configuration présentant des parties de contour externe (14, 15) courbes, différentes d'une configuration en demi-cercle.
PCT/EP2009/002833 2008-04-22 2009-04-17 Dispositif de guidage d'air de combustion Ceased WO2009129968A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810020142 DE102008020142B3 (de) 2008-04-22 2008-04-22 Verbrennungsluftführungsvorrichtung
DE102008020142.1 2008-04-22

Publications (1)

Publication Number Publication Date
WO2009129968A1 true WO2009129968A1 (fr) 2009-10-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/002833 Ceased WO2009129968A1 (fr) 2008-04-22 2009-04-17 Dispositif de guidage d'air de combustion

Country Status (2)

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DE (1) DE102008020142B3 (fr)
WO (1) WO2009129968A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5720255A (en) * 1994-02-14 1998-02-24 Yamaha Hatsudoki Kabushiki Kaisha Control valve for multi-valve engine
WO2007017645A1 (fr) * 2005-08-11 2007-02-15 Active Technologies Limited Ensemble vanne
EP1925796A1 (fr) * 2006-11-21 2008-05-28 MAGNETI MARELLI POWERTRAIN S.p.A. Vanne papillon d'un système tourbillonnaire pour moteur à combustion interne
EP1947312A1 (fr) * 2007-01-16 2008-07-23 Hitachi, Ltd. Dispositif de vanne papillon

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2793539B1 (fr) * 1999-05-10 2001-07-27 Mark Iv Systemes Moteurs Sa Dispositif a clapet, collecteur d'admission comportant au moins un tel dispositif et son procede de fabrication
JP2002309945A (ja) * 2001-04-17 2002-10-23 Toyota Motor Corp 内燃機関の吸気装置
JP2005273527A (ja) * 2004-03-24 2005-10-06 Kawasaki Heavy Ind Ltd レジャービィークル用エンジン
DE102006009155A1 (de) * 2006-02-24 2007-08-30 Mahle International Gmbh Schaltventil und zugehöriges Herstellungsverfahren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5720255A (en) * 1994-02-14 1998-02-24 Yamaha Hatsudoki Kabushiki Kaisha Control valve for multi-valve engine
WO2007017645A1 (fr) * 2005-08-11 2007-02-15 Active Technologies Limited Ensemble vanne
EP1925796A1 (fr) * 2006-11-21 2008-05-28 MAGNETI MARELLI POWERTRAIN S.p.A. Vanne papillon d'un système tourbillonnaire pour moteur à combustion interne
EP1947312A1 (fr) * 2007-01-16 2008-07-23 Hitachi, Ltd. Dispositif de vanne papillon

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