Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
  • F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
  • F02D19/021—Control of components of the fuel supply system
  • F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
• • 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
  • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
  • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
  • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
  • F02M21/0248—Injectors
  • F02M21/0278—Port fuel injectors for single or multipoint injection into the air intake 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
  • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
  • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
  • F02M21/04—Gas-air mixing apparatus
  • F02M21/042—Mixer comprising a plurality of bores or flow passages
• • 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
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M26/51—EGR valves combined with other devices, e.g. with intake valves or compressors
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
  • B01F2101/503—Mixing fuel or propellant and water or gas, e.g. air, or other fluids, e.g. liquid additives to obtain fluid fuel
• • 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
  • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
  • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
  • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
  • F02M21/0248—Injectors
  • F02M21/0281—Adapters, sockets or the like to mount injection valves onto engines; Fuel guiding passages between injectors and the air intake system or the combustion chamber
• • 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
  • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
  • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
  • F02M21/04—Gas-air mixing apparatus
  • F02M21/047—Venturi mixer
• • 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
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
  • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
  • F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake 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
  • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
  • F02M35/10—Air intakes; Induction systems
  • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
  • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

• the invention relates to a mixture formation device for a combustion engine operated with a combustible gas and to an internal combustion engine in whose intake tract such a mixture formation device is arranged.
• incompressible liquids have a significantly higher compressibility, such a gas can not with a conventional fuel pump in the combustion chamber of the
• a compressor for a gaseous fuel builds at the same drive power significantly larger and higher than a corresponding
• High pressure fuel pump Although a direct injection of the combustible gas (analogous to a direct injection of liquid fuel) in the combustion chamber of the engine is possible, but this requires a relatively high pressure level in the gas tank of at least 20 bar, whereby only an incomplete emptying of the gas tank is possible and thus the range of Motor vehicle is significantly reduced.
• a spaced apart from the carburetor disc is provided, which has a central, closable opening. This opening is released in the higher speed range of the engine, so in all
• Flow rates can be varied with partially open exhaust gas recirculation valve.
• the invention is based on the object, a simple and inexpensive
• a mixture formation device for arrangement in an intake passage of a combustion engine operated with a combustible gas, which comprises a closing member, with which the opening cross-section of the intake passage of
• Internal combustion engine can be reduced, at least one metering valve for metering of the combustible gas into the intake passage of the internal combustion engine, and at least one connection for an exhaust gas recirculation of the internal combustion engine, wherein a
• Fresh air flow is redirected by a Umlenkgeometrie of the closing member in a first annular channel, in particular in a diffuser, and wherein a first point of introduction for the combustible gas and a second point of introduction for the means of exhaust gas recirculation
• Suction pressure in the upstream of the mixture forming device flow section is reduced, whereby the dynamics in the field of fuel gas supply is improved. Furthermore, higher exhaust gas recirculation rates are possible due to the higher dynamics and the reduced pressure, without damaging the recirculated exhaust gas in the exhaust gas recirculation line. In this case, less Ausschiebearbeit is necessary, so that the fuel gas consumption can be reduced with such a mixture formation device.
• the combustible gas metered into a fuel gas distribution ring, which is connected via a channel with the diffuser of the intake passage.
• a fuel gas distribution ring Through the fuel gas distribution ring a first mixing of the combustible gas with the fresh air is possible, whereby a particularly uniform mixing of the combustible gas with the fresh air in the fuel gas distribution ring ring channel is achieved.
• the fuel gas distribution ring serves to reduce pressure peaks or to a flow equalization, whereby a homogeneous mixture formation is promoted. As a result, a particularly clean and low-emission combustion of the combustible gas is possible.
• the channel is substantially perpendicular to a
• Exhaust gas recirculation has an exhaust gas recirculation distribution ring which extends at least in sections around an intake pipe of the intake duct.
• the closing member has a guide portion for flow guidance of the fresh air, the combustible gas and / or the recirculated exhaust gas and a guide portion, with which the closing member is guided in a housing of the mixture forming device.
• a flow guide on the closing member additional control geometries for the fresh air can be omitted, which would be associated with additional components or a more complex design of the housing and would cause additional costs.
• a machining of the outer contour of the closing member is usually less expensive than a machining of the inner contour of the
• the closing member can be guided in a simple manner in the housing without a flow impairment in the region of the guide geometry, the
• the guide portion is guided on a closed housing portion of the housing.
• a negative pressure can be generated, which arises when the valve closes and thus generates a restoring force against the closing force of the valve.
• pressure compensation bores are provided on the closing element in order to obtain overpressure or underpressure occurring during the movement of the closing element
• a seal is arranged between the guide portion and the housing. Through a seal between the guide portion and the closed housing portion of the housing, an influx of gas into the
• Compensation volume can be prevented, so that a gas exchange between the air flow of the mixture formation device and the compensating volume at least largely
• the closing element is hollow in the region of the guide section and encloses a compensating volume.
• a hollow closure member By a hollow closure member, a comparatively large compensation volume can be limited, so that the gas forces occurring during a displacement of the closing member are comparatively small and thus easily controllable.
• material and mass can be saved on the closing member by a hollow closing member, whereby the dynamic behavior of the closing member can be improved.
• the surface of the wall of the first annular channel can be optimally used and it can be formed a plurality of first and second discharge points, wherein the first discharge points preferably on a first, common bolt circle and the second discharge points are preferably on a second, common bolt circle.
• the gap width of the diffuser is approximately 1/8 to 1/800 of the diameter of an intake pipe of the intake duct.
• the first ring channel must be flowed through both at idle and at full load.
• a minimum quantity capability and, on the other hand, a maximum power output in full load operation must be ensured.
• a width of 1/8 to 1/800 of the intake pipe, in particular a width or height between 50 ⁇ and 5 mm has indeed after application as a good compromise between the necessary throttling to
• the first annular channel is designed as a diffuser.
• the outlet cross section of the first annular channel can be increased and the flow velocity (and thus the
• the closing member is a valve with a valve stem and a valve disc, wherein the valve disc has a first, radially inner portion which extends at a first angle to the valve stem and has a second, radially outer portion, which under a in Compared to the first section larger angle to the valve stem runs.
• a diffuser can be formed between the valve and a straight wall of the housing in a simple manner.
• Closing member is formed.
• a valve with a comparatively short valve plate can be used, whereby the costs and the space required for the valve can be reduced.
• Micro quantity capability of the mixture forming device improved. It is particularly advantageous if the contour of the projection has a profile. By profiling the projections, the transition from a small amount of metered combustible gas into a region with larger amounts of gas can be improved, whereby an improved
• first introduction point and the second introduction point are arranged on a common diameter.
• a plurality of first and a plurality of second introduction points are arranged alternately on this diameter in order to allow a uniform mixing of the fuel gas with the recirculated exhaust gas.
• Cross sections of the first discharge points for the combustible gas is less than 15%, preferably less than 10%, of the maximum cross-sectional area of the diffuser in the region of the first discharge points.
• the discharge points for the recirculated exhaust gas and for the combustible gas are preferably designed as annular channels.
• an internal combustion engine with at least one combustion chamber, an intake passage, an exhaust passage, an exhaust gas recirculation from the exhaust passage in the
• Figure 1 is a schematic diagram of an internal combustion engine
• Figure 2 shows a first embodiment of an inventive
• FIG. 3 shows the mixture-forming device from FIG. 2 in a three-dimensional view
• Figure 4 shows a second embodiment of an inventive
• FIG. 5 shows the mixture-forming device of FIG. 4 in a three-dimensional view
• Figure 6 shows a first embodiment of a valve seat of an inventive
• Figure 7 shows a further embodiment of a valve seat of an inventive
• Figure 8 shows a further embodiment of a valve seat of an inventive
• Figure 9 shows another embodiment of a valve seat of an inventive
• FIG. 10 shows a valve seat of a mixture formation device according to the invention when the valve is partially closed.
• FIG. 1 shows a greatly simplified construction of an internal combustion engine 1 with four
• Combustion chambers 2 an intake passage 3 and an exhaust passage 4.
• Exhaust gas recirculation 5 is provided, which connects the exhaust passage 4 with the intake passage 3 and thus allows recirculation of combusted fuel components in the intake passage 3 of the internal combustion engine 1.
• the internal combustion engine 1 is designed in the embodiment described below as a gas engine 1 and is operated with a gaseous fuel, preferably with natural gas (CNG - compressed natural gas). Alternatively, operation with liquefied natural gas (LNG) is also possible.
• Gas engines 1 differed in comparison to conventional internal combustion engines in which a liquid fuel is metered into the intake passage 3 or the combustion chambers 2, characterized in that the fuel is gaseous under ambient temperature and pressure and thus highly compressible.
• FIG. 2 shows a first exemplary embodiment of a mixture formation device 10 according to the invention for an internal combustion engine 1 operated with a gaseous fuel.
• the mixture formation device 10 comprises a housing 42, in which a closure member 12, in particular a valve 54, is displaceably arranged.
• the housing 42 has a first, in the plane of the drawing vertically extending portion in which a
• the housing 42 further includes a second portion which forms a diffuser 22.
• the diffuser 22 extends at an angle of about 100 ° to 120 ° to the intake manifold 36.
• a closed housing portion 44 is further formed, which defines a compensating volume 48 together with the closing member 12.
• the closing member 12 is designed as a valve 54, in particular as a poppet valve, formed, and has a valve stem 56 and a valve plate 58.
• the valve stem 56 and the valve plate 58 form on their side facing the intake pipe 36 a
• the valve disk 58 is followed by a guide section 40, in which the valve 54 is guided in the closed housing section 44.
• the closing member 12 is in the range of
• Guide portion 40 is hollow and surrounds the compensating volume 48. Between the guide portion 40 and the housing wall of the closed housing portion 44, a seal 46 is arranged, which the penetration of fresh air into the
• the mixture forming device 10 further comprises at least one, preferably as shown in Figure 1 a plurality, preferably evenly distributed over the circumference of the mixture forming device 10, receiving opening (s) 78, in each of which a metering valve 16 for supplying a combustible gas is arranged.
• the metering valve 16 has at its periphery a seal 76, in particular a sealing ring, with which a gap between the
• Each of the receiving openings 78 is in each case connected to a fuel gas distribution ring 28, in which 16 can be mixed via the metering valves 16 supplied gaseous fuel with fresh air.
• the fuel gas distribution ring 28 is connected to the diffuser 22 via channels 30
• first inlet points 24 are respectively formed at an end of the channel 30 facing the diffuser 22, via which channels 30 are fluidically connected to the diffuser 22.
• the channels 30 extend substantially perpendicular to the outflow openings 32 of the metering valves 16.
• the metering valves 16 are arranged radially, that is, aligned perpendicular to the intake pipe 36 of the mixture formation device 10.
• the metering valves 16 each have a plug 52 with which the metering valves 16 can be electrically contacted.
• the mixture formation device 10 a connection for an exhaust gas recirculation 5 of the internal combustion engine 1 is formed.
• the mixture formation device 10 has an exhaust gas recirculation distribution ring 34, which is at least partially guided around the intake pipe 36 of the intake duct 3 around.
• the second annular channel 34 extends substantially parallel to the diffuser 22 and is connected via second inlet 26 with this diffuser 22.
• the exhaust gas recirculation distribution ring 34 is connected via at least one port 18 to the exhaust gas recirculation 5.
• FIG. 3 shows the mixture-forming device 10 in a three-dimensional representation. It can be seen that the metering valves 16 perpendicular to the intake pipe 36th
• the mixture of fresh air and combustible gas is additionally supplied with exhaust gas recirculated via the exhaust gas recirculation 5 and the exhaust gas recirculation distribution ring 34.
• the recirculated exhaust gas is introduced into the diffuser 22 at a second introduction point 26, wherein the exhaust gas is mixed with the mixture of fresh air and combustible gas.
• the closing member 12 has the function of a quantity controller and can thus replace the throttle in a conventional internal combustion engine.
• the mixture-forming device 10 in FIG. 2 is shown with the valve 54 fully open, that is to say maximally de-throttled.
• By closing the valve 54 that is, a displacement in the direction of a seat edge 74 on the housing 42, an opening cross-section 14 of the diffuser 22 can be reduced.
• Such a partially closed valve 54 is shown in FIG.
• valve disk 58 in the region of the guide portion 40 a in the flow direction of the gas through the diffuser 22 sharp trailing edge, which provides in the diffuser 22 downstream of the valve disk 58 for vortex formation, wherein a wake 80 additional mixing of fresh air, combustible gas and exhaust gas from the exhaust gas recirculation 5 causes.
• a minimum quantity capability in particular during idling of the internal combustion engine 1, as well as a streamlined and preferably low-loss flow guidance in full load operation must be made possible.
• the adjustment of the valve 54 takes place for example via a Electromechanical control, but may alternatively be purely mechanical, for example via a spindle, a rocker arm, a toothing or the like.
• the metering valves 16 are in this embodiment, axial, that is parallel to the
• Intake pipe 36 arranged.
• additional space is created in the radial direction, so that the available space can be used optimally.
• the shape of the fuel gas distribution ring 28 is adapted accordingly, wherein the channel 30 at one of the intake pipe 36 facing the end of
• Brenngasverteilrings 28 is formed and is arranged eccentrically from the discharge opening 32 of the metering valve 16, a correspondingly multiple deflection and
• FIG. 5 shows this exemplary embodiment of a mixture formation device 10 in a three-dimensional representation.
• valve 54 in Figure 6, an alternative embodiment of the valve 54 and the diffuser 22 is shown.
• the valve 54 at its valve plate 58 has a first, radially inner
• Section 60 and a second, radially outer portion 62 which extends at a larger angle compared to the first portion 60 to the valve stem 56. This results between a wall 64 of the housing 42 and the second portion 62 of the
• Valve plate 58 a diffuser 50.
• the diffuser 50 may also, as shown in Figure 7 between two housing parts or housing portions of the housing 42 downstream of the valve plate 58 may be formed.
• a simple labyrinth seal may be provided on the valve seat of the valve 54.
• a recess 66 can be provided on the wall 64 of the housing 42, into which, when the valve 54 is substantially closed, a projection 70 on the valve disk 58 engages.
• a projection 72 may be formed on the wall 64 of the housing 42, which engages in a recess 68 in the valve plate 58.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Exhaust-Gas Circulating Devices (AREA)
• Output Control And Ontrol Of Special Type Engine (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=60473546

Family Applications (1)

Country Status (6)

Families Citing this family (2)

Family Cites Families (30)

• 2016
  • 2016-12-08 DE DE102016123826.0A patent/DE102016123826A1/de not_active Withdrawn
• 2017
  • 2017-11-28 EP EP17804562.1A patent/EP3551871A1/de not_active Withdrawn
  • 2017-11-28 RU RU2019117551A patent/RU2726984C1/ru active
  • 2017-11-28 CN CN201780075943.2A patent/CN110023613B/zh active Active
  • 2017-11-28 US US16/467,608 patent/US11181051B2/en active Active
  • 2017-11-28 WO PCT/EP2017/080634 patent/WO2018104107A1/de active Application Filing

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