WO2000037795A1 - Einrichtung zur gemischbildung an brennkraftmaschinen - Google Patents
Einrichtung zur gemischbildung an brennkraftmaschinen Download PDFInfo
- Publication number
- WO2000037795A1 WO2000037795A1 PCT/DE1999/004072 DE9904072W WO0037795A1 WO 2000037795 A1 WO2000037795 A1 WO 2000037795A1 DE 9904072 W DE9904072 W DE 9904072W WO 0037795 A1 WO0037795 A1 WO 0037795A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel
- internal combustion
- mixture formation
- throttle
- injection
- Prior art date
Links
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
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/04—Injectors peculiar thereto
- F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
- F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
Definitions
- the invention relates to a device for mixture formation on internal combustion engines according to the preamble of claim 1.
- One system is the mixture formation according to the so-called carburetor principle, in which, for example, a naturally aspirated engine is supplied with an ignitable fuel-air mixture in that the air sucked in automatically draws fuel from a fuel reservoir and sucks it in according to the Venturi nozzle principle Fuel is atomized in the area of an intake duct that leads to the combustion chambers and thus produces a fuel-air mixture that is as homogeneous as possible.
- Such mixture preparation systems according to the carburetor principle shown here only in a very simplified form, are known in a large number of variants.
- a particular disadvantage of such carburetor systems is that the suction of the fuel according to the Venturi principle does not work optimally, in particular in the so-called part-load range of the internal combustion engine, for example when idling or when the engine speed is only slightly above the idling speed, because of the suction air prevailing vacuum is not necessarily sufficient for a uniform swirling of the fuel entering the intake duct. Consequences of this are inadequate Mixing of fuel and air and the resulting operating conditions of the internal combustion engine, which are expressed in a restless run.
- Various auxiliary systems are used on conventional carburetor devices to ensure that the internal combustion engine runs as smoothly as possible, even in these partial load ranges. Such additional devices are expensive and also prone to errors.
- injection in which the fuel is injected either into the intake duct of the internal combustion engine by means of a fuel pump and an injection nozzle, or also directly into the combustion chamber of the internal combustion engine in the case of so-called direct injection.
- Injection systems of this type have the advantage that the mixture formation can be influenced well by controlling the injection pressure and the injection times.
- Injection has the disadvantage, however, that the swirling of the fuel injected, for example, into the intake duct by an injection nozzle is only extremely inadequate, especially if it is not intended to work with excessively high injection pressures. The pure injection process therefore does not allow sufficient atomization of the fuel and mixing with the intake air.
- JP 6-173830 A (abstract) a nozzle arrangement in the intake duct of an internal combustion engine is known, which injects into the area behind the throttle valve in order to realize an oil enrichment in the push mode when the throttle valve is closed, as is typically the case with 2-stroke engines as additional lubrication is known.
- An injection system is known from JP 1 -300059 A (abstract), in which an injection nozzle is arranged in front of a throttle valve in the intake duct and a fuel jet is sprayed onto a surface of the throttle valve.
- the direction of injection is such that the jet strikes the throttle valve substantially near the axis of rotation and is used, particularly in full load positions of the internal combustion engine, to bridge bottlenecks in the mixture supply, which, for example, when the throttle valve is suddenly opened when moving from the partial load range in the full load range occur.
- the atomization of the fuel jet will only take place inadequately, and condensation of the fuel may even occur in the event of such a sudden transition between partial load and full load.
- the injection nozzle is arranged upstream of the throttle valve, the fuel jet is reflected by the throttle valve in the partial load range in such a way that it has a rather disadvantageous effect.
- An object of the present invention is therefore to propose a device for mixture formation on internal combustion engines, which causes a particularly good atomization of a fuel when the fuel is injected into an intake duct of an internal combustion engine in part-load operation and permits a design-independent optimization of the mixture preparation.
- the invention according to claim 1 is based on a device for mixture formation in internal combustion engines, comprising a throttle device arranged in an intake duct of an internal combustion engine and pivotable about a pivot axis, and a dispensing device for a supplied fuel arranged in the intake duct in the flow direction of the sucked-in air behind the throttle device .
- Such a device for mixture formation is further developed in that the delivery device delivers the fuel into the intake duct in such a direction that the fuel, in particular also in the lower part-load range of the internal combustion engine with the throttle device opened only slightly, essentially at least on portions of the throttle device hits and atomizes the fuel from the throttle device into the opening formed between the throttle device and the intake duct in the region of the greatest flow velocity of the intake air into the intake air.
- the device for mixture formation according to the invention is based on the fact that the mixture formation is to be optimized in particular for the lower part-load range, in which after Driving values about 75% of the driving operation of an average internal combustion engine takes place with only a maximum of about 10% opening of the throttle device.
- the dispensing device for the fuel is arranged and aligned behind the throttle device in the flow direction of the intake air in such a way that it dispenses the fuel into the intake duct in a direction that the fuel is on as far as possible the section of the throttle device which is open in the lower part of the load area at least partially meets the throttle device itself and is atomized into the volume flow of the sucked-in air which has passed through the throttle device and, due to the greatest flow velocity of the sucked-in air there, is particularly well swirled and mixed with the sucked-in air.
- the device according to the invention stands out from known injection systems which inject into the intake duct in front of a throttle valve or the like.
- the impact of the fuel jet without additional parts having to be provided within the intake duct, uses the throttle valve as a form of a baffle plate, so that the impinging fuel jet bounces off again from the throttle valve under atomization, and other parts of the fuel jet are exposed knock down the surface of the throttle valve and are pushed by the air flow to the edge of the throttle valve, so that this edge of the throttle valve is used like a tear-off edge which has an additional atomizing effect.
- the conditions during the atomization of the fuel change as a function of the respective pivoting position of the throttle device, as a result of which the proportion between direct atomization by rebounding the fuel jet from the throttle valve and the atomization at the edge of the tear-off edge Throttle valve is characteristic of each swivel position of the throttle valve.
- the injection device delivers the fuel under excess pressure into the intake duct as an essentially conically widening jet, as a result of which the injection device can also be at a distance from the section of the throttle device that is open in the part-load range. Therefore, the fuel jet with appropriate selection of the injection direction even with changing opening conditions of the throttle device in the lower part-load range essentially always in the region of the greatest flow velocity through the opening formed between the intake duct and throttle device and thus cause optimal atomization conditions.
- the problems of conventional carburetor designs with vacuum suction of the fuel are avoided, so that particularly good filling levels of the combustion chambers of the internal combustion engine can be achieved by controlling the injection pressure of the fuel into the intake duct. By controlling the overpressure used in each case, one is also special good adaptation to the respective operating conditions of the internal combustion engine possible.
- the throttle device can be a throttle valve with, advantageously, central, rotationally movable articulation of the throttle valve in the intake duct.
- throttle valves are generally known and form an approximately crescent-shaped passage area for the intake air in the lower part-load range on both sides of their axis of rotation. It is precisely in this area of the crescent-shaped opening between the throttle valve and the intake duct that the fuel jet is injected in the manner according to the invention.
- an injection nozzle having at least one outlet opening can be provided as the injection device, which in a generally known manner can emit a single fuel jet into the intake duct.
- Such injection nozzles are widely known. It goes without saying that a plurality of such injection nozzles or field-like arrangements of such injection nozzles of a corresponding type can also be provided in the device for mixture formation according to the invention.
- the device for mixture formation according to the invention can be designed in such a way that the inlet opening of the fuel is designed in such a way that fuel at least partially hits the throttle device and the throttle device redirects the dispensed fuel in the direction of flow.
- the opening angle of the throttle valve will be approximately 90 ° in the full load range, so that the throttle valve comes to lie approximately parallel to the direction of flow of the intake air.
- the fuel jet emitted no longer strikes the size of the throttle valve from a size-dependent opening angle directly in the region of the greatest flow velocity, but at least partially also on the throttle valve.
- the delivery of the fuel jet to the throttle device also has a positive effect in full-load operation, since the fuel jet striking the throttle device on the one hand from the throttle device device is deflected in the direction of flow of the sucked-in air and is atomized at the same time when it hits the throttle device and when it flows off over the edges of the throttle device.
- a particular advantage of the mixture formation device according to the invention is that the mixture formation device can be provided for retrofitting to existing internal combustion engines.
- the legal requirements for reducing the exhaust gas pollution of older internal combustion engines result in the requirement that older internal combustion engines, for example on motorcycles or motor vehicles of older construction, must be retrofitted with new technology in such a way that they comply with the applicable legal requirements for exhaust gas behavior.
- the retrofitting of such existing internal combustion engines can only be carried out economically if, in one embodiment of the device for mixture formation according to the invention, this device is designed to be compatible with the carburettors, injection systems or the like provided on existing internal combustion engines.
- the internal combustion engine can be retrofitted by simply replacing, for example, the built-in carburetor with the mixture formation device according to the invention, without extensive reworking of the existing internal combustion engines.
- the device for mixture formation can be retrofitted regardless of the type of carburetor provided on existing internal combustion engines and without adaptation to predefined arrangements of the inlet valves or the like of the internal combustion engines.
- a sensor for preferably continuously detecting the open position of the throttle device is provided on the device for mixture formation. Such a sensor is used to transmit the information about the respective position of the throttle device, e.g. to a digital engine control.
- the consumption of fuel preferably in the lower part-load range of the internal combustion engine, is further reduced compared to the use of conventional carburettors, which also further improves compliance with the legally increasingly tightened exhaust gas regulations.
- the injection pressure of the fuel into the intake duct can be reduced compared to conventional injection systems with valve-near injection, since the better atomization in the region of the greatest flow velocity of the intake air makes the otherwise necessary high injection pressures superfluous.
- This can have an effect, for example, in a reduction in the pump output of the injection pump, which can be limited, for example, in terms of the available output due to the electrical voltage supply, in particular when retrofitting existing internal combustion engines.
- the time for dispensing fuel and the quantity of fuel dispensed into the intake duct can be predetermined by sensors arranged on the internal combustion engine, with which the operating state of the internal combustion engine, in particular the angular position of the crankshaft and its speed, can be detected is.
- This allows a further adjustment of the injection of the fuel and in particular the Atomization conditions are brought about in the lower part-load range, whereby a further improvement in the smooth running of the internal combustion engine can be achieved.
- the drawing shows particularly preferred embodiments of the device for mixture formation according to the invention.
- Figure 1 - a device for mixture formation on internal combustion engines from the prior art with fuel injection near the inlet valve
- FIG. 2 shows an embodiment of the device for mixture formation according to the invention with fuel injection arranged near the throttle device, shown in the partial load range,
- FIG. 3 - a device according to Figure 2, shown in the full load range
- FIG. 1 shows a device known in the prior art for mixture formation, in which the injection of the fuel by means of an injection device 6 with an injection nozzle 5 into an intake duct 3 proceeds in such a way that the fuel jet 9 essentially in the inlet region of the inlet valve 10 hits the volume flow of the intake air in the combustion chamber 11 of the internal combustion engine and is atomized there.
- the sucked-in air enters in the flow direction 8 through the suction-side flange 4 of the device and its quantity is changed by a throttle valve 1, which is adjustable on both sides in a pivoting direction 15 about a throttle valve shaft 2.
- the throttle valve 1 is either opened or closed in the pivoting direction 15, with only small opening areas in the form of gap areas 14 arranged at the top and bottom, in particular in the part-load area.
- the sucked-in air with the highest flow rate passes through these gap areas 14, the flow rate of the sucked-in air decreasing significantly again after passing through the gap areas 14.
- the injection device 6 is arranged between the throttle valve 1 and the inlet valve 10 in such a way that the fuel jet 9 is emitted from the injection nozzle 5 precisely in this region of relatively low flow velocities.
- the fuel jet 9 must be directed along the injection direction 7 precisely into the area which ultimately causes swirling of the fuel jet 9 with the intake air near the intake valve 10, since the intake air in the area of the intake valve 10 is in turn greatly accelerated . Since the storage and control of the inlet valve 10 is complicated and requires a relatively large amount of space, the injection device 6 will be located relatively far from the inlet valve 10. As a result, the injected fuel jet 9 does not necessarily reach the area of greatest flow velocity of the intake air in the area of the inlet valve 10, as a result of which the atomization of the fuel jet 9 is insufficient.
- the atomization of the fuel jet 9 is independent of the arrangement of a combustion chamber 11 or an inlet valve 10 in the region of a throttle device, here a throttle valve 1, which is located at a convenient location within of the intake duct 3 can be.
- the intake duct 3 is provided in a, for example, tubular intake manifold 16, in which, for example, a throttle valve 1 can be pivoted on both sides in a generally known manner about a throttle valve shaft 2 in the pivoting direction 15.
- an injection device 6 is arranged, for example, with an injection nozzle 5 in such a way that the fuel jet 9 takes place in the injection direction 7, here approximately perpendicular to the flow direction 8 of the sucked-in air.
- opening the throttle valve 1 forming gap area 14 between the throttle valve 1 and the intake duct 3 is directed that the fuel jet 9 in the area of the greatest flow velocity of the intake air through the Gap area 14 mixed with the sucked air and atomized.
- the injection device 6 is arranged in the flow direction 8 of the intake air behind the throttle valve 1, that in particular in the lower part-load range the fuel jet 9 runs virtually in the slipstream of the throttle valve 1 and essentially only in the gap area 14 the sucked air can interact and be atomized.
- a deflection of the fuel jet 9 in the region of not so high flow velocities of the intake air, which is detrimental to fine atomization, does not take place, or takes place only insignificantly.
- This assignment of the injection direction 7 of the fuel jet 9 and the direction of flow 8 of the sucked-in air through the gap region 14 results in particularly good atomization of the fuel, which is already present, for example, even at relatively low injection pressures with which the injection device 6 can work.
- the particularly good atomization also enables a particularly homogeneous combustion of the mixture formed, as a result of which it is possible overall to reduce the fuel consumption while at the same time reducing the harmful exhaust gases.
- the mixture formation device according to the invention is largely independent of the structural position of the mixture supply in the combustion chamber 11 of an internal combustion engine, since the high flow velocities in the area of the inlet valves 10 of an internal combustion engine are not required for atomization and mixture formation.
- an exchange, for example, of a conventional carburetor system on such an old internal combustion engine can be carried out simply by removing the carburetor and replacing it with a connection-compatible design of the intake manifold 16 in the area of the suction-side flange 4 and the valve-side flange 13.
- an optionally provided sensor, not shown, for detecting the position of the throttle valve 1 can also be designed to be compatible with the connection.
- 3 shows the device for mixture formation according to the invention in the full-load range, reference being made to the description of the basic structure of the device for mixture formation according to the invention relating to FIG.
- the throttle valve 1 is aligned in the full-load range essentially parallel to the flow direction 8 of the intake air, as a result of which there are no more explicit gap regions 14 for the passage of the intake air through the opening formed between the throttle valve 1 and the intake duct 3.
- the atomization of the fuel is of minor importance. It is of primary importance that a corresponding amount of fuel is introduced into the combustion chamber 11 of the internal combustion engine.
- the fuel jet 9 strikes the throttle valve 1 arranged perpendicular to the injection direction 7 and is atomized there like in a baffle plate.
- the fuel jet 9 struck on the throttle valve 1 is accelerated towards the edges of the throttle valve 1 and can be entrained there in the form of fine droplets by the intake air flowing around the throttle valve 1.
- the throttle valve shaft 2 can be provided with a bevel 17 which, in the form of a surface section reflecting the fuel jet 9, causes the deflection of the fuel jet 9 in the flow direction 8 and thus likewise contributes to good atomization of the fuel jet 9 even under full load operation.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
- Means For Warming Up And Starting Carburetors (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59902238T DE59902238D1 (de) | 1998-12-21 | 1999-12-21 | Einrichtung zur gemischbildung an brennkraftmaschinen |
AT99967890T ATE221618T1 (de) | 1998-12-21 | 1999-12-21 | Einrichtung zur gemischbildung an brennkraftmaschinen |
EP99967890A EP1141541B1 (de) | 1998-12-21 | 1999-12-21 | Einrichtung zur gemischbildung an brennkraftmaschinen |
AU24286/00A AU2428600A (en) | 1998-12-21 | 1999-12-21 | Carburetor for internal combustion engines |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998159033 DE19859033A1 (de) | 1998-12-21 | 1998-12-21 | Einrichtungen an Brennkraftmaschinen |
DE19859033.4 | 1998-12-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000037795A1 true WO2000037795A1 (de) | 2000-06-29 |
Family
ID=7891969
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1999/004072 WO2000037795A1 (de) | 1998-12-21 | 1999-12-21 | Einrichtung zur gemischbildung an brennkraftmaschinen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1141541B1 (de) |
AT (1) | ATE221618T1 (de) |
AU (1) | AU2428600A (de) |
DE (1) | DE19861164A1 (de) |
WO (1) | WO2000037795A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10036391B4 (de) * | 2000-07-26 | 2010-04-15 | Volkswagen Ag | Fahrzeug-Überwachungssystem |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2057308A1 (de) | 1970-11-21 | 1972-05-25 | Daimler Benz Ag | Brennkraftmaschine,insbesondere Rotationskolben-Brennkraftmaschine,mit einem Einlasskanal |
DE3028244A1 (de) * | 1979-08-01 | 1981-02-26 | Toyota Motor Co Ltd | Vergaser mit brennstoffeinspritzung |
US4327675A (en) * | 1979-01-23 | 1982-05-04 | Toyota Jidosha Kogyo Kabushiki Kaisha | Fuel injection type internal combustion engine |
JPS6027737A (ja) * | 1983-07-27 | 1985-02-12 | Yamaha Motor Co Ltd | 給気通路の絞り弁 |
JPH01300059A (ja) | 1988-05-26 | 1989-12-04 | Daihatsu Motor Co Ltd | スロットルボディの構造 |
JPH06159201A (ja) * | 1992-11-27 | 1994-06-07 | Mazda Motor Corp | エンジンの燃料噴射装置 |
JPH06173830A (ja) | 1992-12-09 | 1994-06-21 | Sanshin Ind Co Ltd | 燃料噴射式内燃機関 |
EP0732497A1 (de) * | 1995-02-28 | 1996-09-18 | Suzuki Kabushiki Kaisha | Brennstoffeinspritzsystem einer Brennkraftmaschine |
-
1998
- 1998-12-21 DE DE19861164A patent/DE19861164A1/de not_active Withdrawn
-
1999
- 1999-12-21 EP EP99967890A patent/EP1141541B1/de not_active Expired - Lifetime
- 1999-12-21 AT AT99967890T patent/ATE221618T1/de not_active IP Right Cessation
- 1999-12-21 AU AU24286/00A patent/AU2428600A/en not_active Abandoned
- 1999-12-21 WO PCT/DE1999/004072 patent/WO2000037795A1/de active IP Right Grant
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2057308A1 (de) | 1970-11-21 | 1972-05-25 | Daimler Benz Ag | Brennkraftmaschine,insbesondere Rotationskolben-Brennkraftmaschine,mit einem Einlasskanal |
US4327675A (en) * | 1979-01-23 | 1982-05-04 | Toyota Jidosha Kogyo Kabushiki Kaisha | Fuel injection type internal combustion engine |
DE3028244A1 (de) * | 1979-08-01 | 1981-02-26 | Toyota Motor Co Ltd | Vergaser mit brennstoffeinspritzung |
JPS6027737A (ja) * | 1983-07-27 | 1985-02-12 | Yamaha Motor Co Ltd | 給気通路の絞り弁 |
JPH01300059A (ja) | 1988-05-26 | 1989-12-04 | Daihatsu Motor Co Ltd | スロットルボディの構造 |
JPH06159201A (ja) * | 1992-11-27 | 1994-06-07 | Mazda Motor Corp | エンジンの燃料噴射装置 |
JPH06173830A (ja) | 1992-12-09 | 1994-06-21 | Sanshin Ind Co Ltd | 燃料噴射式内燃機関 |
EP0732497A1 (de) * | 1995-02-28 | 1996-09-18 | Suzuki Kabushiki Kaisha | Brennstoffeinspritzsystem einer Brennkraftmaschine |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 18, no. 491 (M - 1672) 13 September 1994 (1994-09-13) * |
PATENT ABSTRACTS OF JAPAN vol. 9, no. 152 (M - 391)<1875> 27 June 1985 (1985-06-27) * |
V.FERSEN: "Neue Zentraleinspritzung für Ottomotoren von Honda", MOTORTECHNISCHE ZEITSCHRIFT, vol. 50, no. 4, 1 April 1989 (1989-04-01), stuttgart, pages 172, XP000038053 * |
Also Published As
Publication number | Publication date |
---|---|
ATE221618T1 (de) | 2002-08-15 |
EP1141541A1 (de) | 2001-10-10 |
AU2428600A (en) | 2000-07-12 |
DE19861164A1 (de) | 2000-07-06 |
EP1141541B1 (de) | 2002-07-31 |
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