WO2022069108A1 - Valve d'injection pour un système d'injection d'eau d'un moteur à combustion interne et système d'injection d'eau équipé d'une telle valve d'injection - Google Patents

Valve d'injection pour un système d'injection d'eau d'un moteur à combustion interne et système d'injection d'eau équipé d'une telle valve d'injection Download PDF

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Publication number
WO2022069108A1
WO2022069108A1 PCT/EP2021/072911 EP2021072911W WO2022069108A1 WO 2022069108 A1 WO2022069108 A1 WO 2022069108A1 EP 2021072911 W EP2021072911 W EP 2021072911W WO 2022069108 A1 WO2022069108 A1 WO 2022069108A1
Authority
WO
WIPO (PCT)
Prior art keywords
injection valve
water
inlet
injection
axial direction
Prior art date
Application number
PCT/EP2021/072911
Other languages
German (de)
English (en)
Inventor
Ansgar Seitz
Elmar Okrent
Frank Miller
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2022069108A1 publication Critical patent/WO2022069108A1/fr

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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/025—Adding water
    • F02M25/028—Adding water into the charge intakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0221—Details of the water supply system, e.g. pumps or arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0221—Details of the water supply system, e.g. pumps or arrangement of valves
    • F02M25/0225—Water atomisers or mixers, e.g. using ultrasonic waves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0227—Control aspects; Arrangement of sensors; Diagnostics; Actuators
    • 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
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • Injection valve for a water injection system of an internal combustion engine and water injection system with such an injection valve
  • the invention relates to an injection valve for a water injection system of an internal combustion engine, having the features of the preamble of claim 1.
  • the internal combustion engine can in particular be a gasoline engine.
  • the invention relates to a water injection system for an internal combustion engine with an injection valve according to the invention.
  • the fuel consumption of combustion engines must be optimized, for example by increasing compression or by downsizing concepts in combination with turbocharging.
  • the engine load is high, however, it is generally not possible to operate the internal combustion engine at an operating point that would be optimal in terms of fuel consumption, since operation is limited by the tendency to knock and high exhaust gas temperatures.
  • Measures to reduce the tendency to knock and/or lower the exhaust gas temperatures provide for the injection of water, it being possible for the injection to take place directly into a combustion chamber of the internal combustion engine or into an intake tract of the internal combustion engine.
  • DE 10 2015 208 472 A1 shows an example of an internal combustion engine with a water injection device that includes a water tank for storing water, a pump for pumping the water and a water injection valve for injecting water.
  • the pump is connected to the water tank on the inlet side via a first line and to the water injection valve on the outlet side via a second line.
  • the pump can be operated in the opposite conveying direction.
  • a water injection device for an internal combustion engine is known from published application DE 10 2015 208 508 A1, which comprises at least two injection valves or water injectors, which are emptied one after the other by reversing the conveying direction of a conveying element.
  • the injection valves or water injectors therefore do not have to be designed to withstand ice pressure.
  • the fact that the injection valves are emptied one after the other is intended to safely remove any water that is present.
  • an injection valve for a water injection system of an internal combustion engine includes an annular magnetic coil for acting on a liftable armature, which is connected to a valve member.
  • the injection valve also includes a hollow-cylindrical core, which is surrounded at least in sections by the magnetic coil and is formed on an inlet connection or is connected to an inlet connection, the injection valve being able to be supplied with water via the inlet connection, with a body being inserted into the inlet connection, with an inner jacket is formed on the inlet connector in a receptacle of the inlet connector, with an outer jacket being formed on the body, with the outer jacket of the body partially abutting the inner jacket of the inlet connector.
  • At least one flow channel is formed in the axial direction between the outer shell of the body and the inner shell of the inlet connector, the flow channel formed between the body and the inlet connector Dete flow channel defines at least one inlet opening for supplying the Eispritzventil with water.
  • the injection valve for a water injection system of an internal combustion engine has the advantage that the injection valve can be emptied particularly easily and quickly through the body in the inlet connection in a suck-back operation of the water injection system. In this way, icing of the injection valve and thus damage to the injection valve can advantageously be prevented.
  • the injection valve is supplied with water, for example, exclusively via the flow channels formed in the body. These extend in the axial direction, preferably parallel to a longitudinal axis of the injection valve, along an axial direction.
  • the reduced free flow cross section of the flow channels formed in the body also increases the flow speed when water is sucked back, so that the emptying of the injection valve is accelerated at the same time.
  • the reduced flow cross section counteracts turbulence.
  • significantly more water can be sucked back out of the injection valve in the same amount of time with the same sucking-back performance of a conveying element used for sucking back. This means that the risk of icing and damage to the injection valve due to ice pressure is significantly reduced at low outside temperatures.
  • the inlet opening of the injector is not formed by the inlet port, but rather by the body inserted into the inlet port together with the inlet port.
  • the body thus reduces the free flow cross-section available for supplying water to the injection valve.
  • a dead volume in the intake port that has to be emptied to prevent the injection valve from icing is minimized. This means that less water has to be sucked back out of the injection valve.
  • the body is inserted into the inlet connection in such a way that the flow channels are formed between the body and the inlet connection.
  • the flow channels are, for example, only between the outer surface of the body pers and the inner jacket of the inlet connection.
  • the outer jacket of the body is shaped accordingly, so that flow channels are formed between the outer jacket of the body and the inner jacket of the inlet connector when the body is inserted in the inlet connector.
  • Any injection valve for example a fuel injection valve, can thus advantageously be upgraded to an injection valve according to the invention for water injection in an advantageously simple manner by means of the body inserted into the inlet connection.
  • Flow channels which are formed between the body and the inlet connector, advantageously arise simply through the contact between the outer shell of the body and the inner shell of the inlet connector, for example through grooves or grooves that are formed in the body and covered by the inner shell of the inlet connector.
  • the body can thus advantageously be manufactured in a simple manner, without flow openings having to be formed inside the body.
  • At least one indentation extending in the axial direction is formed in the body on the outer shell of the body, with the flow channel running in the indentation and being covered by the inner shell of the inlet connector in the radial direction perpendicular to the axial direction .
  • the indentation can be formed, for example, as a groove or groove in the body and can form the flow channel together with the inner jacket of the inlet connector.
  • the flow channel can thus advantageously be simply formed between the body and the inlet connector.
  • the inner casing is designed in a cylindrical manner at least in sections.
  • the receptacle of the inlet connector is designed with an advantageous geometry, which advantageously facilitates the insertion or pressing of the body into the receptacle.
  • the at least one flow channel runs in the axial direction. With a flow channel designed in this way, the water can advantageously be guided easily and effectively from the inlet opening to the injection opening of the injection valve.
  • the water to be injected through the injection valve is advantageously divided into a plurality of flow channels and conducted in parallel in the flow channels to the injection opening of the injection valve.
  • the individual flow channels have comparatively small cross sections, so that turbulence in the flow channels is advantageously prevented and the water can advantageously be sucked back out of the flow channels well and quickly.
  • the flow channels are arranged in a plane perpendicular to the axial direction on a circle.
  • the flow channels can be distributed evenly around the body and an advantageously even conduction of the water in the inlet connector is ensured.
  • all flow channels on the circle are at the same distance from the respective adjacent flow channels on the circle.
  • the body has a star-shaped cross section perpendicular to the axial direction, with a flow channel running between each two adjacent tips of the star-shaped cross section. Due to the star geometry, the press-in forces required to press the body into the inlet connection can be selected in such a way that a permanent connection is created without possible cold welding / chip formation on the counter-partner during the press-in process. For this purpose, an insertion bevel or a radius can be formed on an insertion side of the body. According to an advantageous exemplary embodiment, it is provided that the body is pressed into the recess of the inlet connector.
  • the body is advantageously firmly connected to the injection valve.
  • pressing in ensures that the areas on the outer shell and on the inner shell that touch one another are firmly in contact and separate the individual flow channels from one another. In the areas of the flow channels, the body is then at a distance from the inlet port. In the areas outside the flow channels, the body on the outer jacket is in direct contact with the inner jacket of the inlet connector and is pressed against it, so that the individual flow channels are separated from one another by the area pressed against one another.
  • pressing the body into the inlet port represents an advantageously simple and cost-effective method for fastening the body.
  • a water injection system for an internal combustion engine comprises an injection valve, the water injection system also comprising a water tank for storing water and a conveying element for conveying water from the water tank to the injection valve.
  • FIG. 1 shows a schematic longitudinal section through an exemplary embodiment of the injection valve
  • FIG. 2 shows an enlarged illustration of the longitudinal section through the exemplary embodiment of the injection valve from FIG. 1
  • 3 shows a three-dimensional sectional illustration of the exemplary embodiment of the injection valve from FIG. 1
  • FIG. 4 shows a schematic representation of an exemplary embodiment of a water injection system
  • FIG. 5 shows a schematic representation of an exemplary embodiment of an internal combustion engine with an injection valve.
  • FIG. 1 shows an injection valve 1 for a water injection system 50 of an internal combustion engine 100 which comprises an annular magnetic coil 2 for acting on a movable armature 3 which is connected to a valve member 4 .
  • the valve member 4 is designed as a hollow needle and is connected at its end remote from the armature 3 to a spherical valve closing element 29 for releasing and closing at least one injection opening 30 .
  • a magnetic field forms, the magnetic force of which moves the armature 3 including the valve member 4 and the valve closing element 29 in the direction of a core 5 in order to close a working air gap 31 formed between the core 5 and the armature 3.
  • the spherical valve closing element 29 releases the injection opening 30 in the process.
  • the core 5 is designed as a hollow cylinder and is connected via a hollow-cylindrical connecting part 33 to an inlet connection 6, via which the injection valve 1 can be supplied with water from a distributor line (not shown), for example a rail.
  • the inlet socket 6 is surrounded, for example, by a cup-shaped connection element of the distribution line, a rail cup, it being possible for a sealing ring 13 to be arranged between the cup-shaped connection element and the inlet socket 6 .
  • the inlet area can thus be sealed off from the outside.
  • a body 8 is inserted, in particular pressed, into the inlet port 6 of the injector 1 in order to reduce a dead volume in the inlet area of the injector 1 .
  • the body 8 is inserted into the seat 60 of the inlet port 6 from an inlet direction of the fuel injector 1 in the axial direction a.
  • An inner casing 61 is formed on the inlet connection piece 6 in the receptacle 60 of the inlet connection piece 6 .
  • An outer casing 81 of the body 8 is formed on the body 8 .
  • the outer shell 81 of the body 8 faces the inner shell 61 of the inlet port 6 .
  • Flow channels 9 are formed between the outer jacket 81 of the body 8 and the inner jacket 61 of the inlet connector 6 .
  • the flow channels are each delimited by the outer jacket 81 of the body 8 and by the inner jacket 61 of the inlet connector 6 .
  • the outer shell 81 of the body 8 and the inner shell 61 of the inlet connector 6 are in direct contact with one another and thereby separate the flow channels 9 from one another.
  • depressions for example in the form of grooves or grooves are formed to form the flow channels. The depressions run parallel to one another in the axial direction a.
  • the indentations are covered in the radial direction r by the inner jacket 61 of the inlet connector 6, with the outer jacket 81 of the body 8 and the inner jacket 61 of the inlet connector 6 being in direct contact with one another at the edge of the indentations and thus forming the flow channels 9.
  • the radial direction r is perpendicular to the axial direction a.
  • the inner shell 61 is, for example, at least partially cylindrical.
  • a multiplicity of flow channels 9 are formed in the injection valve 1 .
  • the flow channels 9 all have the same shape. For this purpose, all depressions in the body 8 are of the same design.
  • the flow channels 9 run in the axial direction a and parallel to one another.
  • the flow channels 9 are lined up in a circle in a cross-section through the body 8 perpendicular to the axial direction a, with each two consecutive flow channels 9 having the same distance from one another as any pair of other consecutive flow channels 9 .
  • the body 8 has a star-shaped cross section.
  • the tips of the body 8, which has a star-shaped cross section, are in direct contact with the inner jacket 61 of the inlet connector 6 and form the boundaries between the individual flow channels 9 of the injector 1.
  • the tips are arranged on a circle in the cross section perpendicular to the axial direction a.
  • the flow channels 9 run in the grooves between the tips of the body 8, which has a star-shaped cross section. They flow channels 9 all have the same shape and are arranged around the body 8 at regular intervals.
  • the flow channels 9 together define an inlet opening 10 of the injection valve 1, which is used to supply the injection valve 1 with water.
  • the injection valve 1 is therefore supplied with water from the distribution line exclusively via the flow channels 9 between the inner jacket 61 of the inlet connection 6 and the outer jacket 81 of the body 8.
  • the body 8 is otherwise solid.
  • the body 8 can be made of metal, plastic or a combination of metal and plastic, for example.
  • injector 1 By reducing the dead volume through body 8 pressed into receptacle 60 of inlet connector 6, injector 1 can be emptied quickly by sucking back, so that there is no risk of damage caused by freezing water when combustion engine 100 is switched off and outside temperatures are low.
  • a water injection system 50 with injection valves 1 is shown in FIG.
  • the water injection system 50 is provided for an internal combustion engine 100 and comprises at least one distribution line 7 and at least one injection valve 1 .
  • a distribution line 7 serving to supply the injection valves 1 with water is also called rail 7 .
  • the water injection system 50 shown includes, for example, four such injection valves 1.
  • the injection valves 1 are connected to a distributor line 7.
  • a distribution line 7 usually has at least one cup-shaped connection element for connecting an injection valve 1 .
  • Injector 1 is over the cup-shaped connection element is connected to the distributor line 7 .
  • the connection can be, for example, a plug, press, clamp, snap-in and/or screw connection.
  • This connection element is also called a rail cup.
  • the rail cup encloses the end of the injector 1 on the inlet side in the area of the inlet connection piece 6.
  • An axial and/or radial gap remaining between the cup-shaped connection element and the inlet connection piece 6 or the body 8 can be used to accommodate a sealing element, in particular a sealing ring , so that the inlet area of the injection valve 1 is sealed to the outside.
  • the sealing ring can be arranged on the outer circumference of the body or can surround the body in sections, so that it seals radially. Alternatively or additionally, the sealing ring can be supported axially on an annular end face of the body 8 so that it seals axially.
  • the dead volume of the rail cup depends on the specific design of the rail cup and the design of the end of injector 1 on the inlet side.
  • the body 8 inserted into the inlet connection piece 6 can protrude beyond it in the axial direction a and/or in the radial direction.
  • the body 8 can have an annular collar that protrudes beyond the inlet connector 6 in the axial and radial directions.
  • the annular collar can also be used to support the injector 1 on a cup-shaped connection element of the distributor line 7 .
  • the injection valve 1 can be supported axially and/or radially on the cup-shaped connecting element via the annular collar.
  • the distribution line 7 or the rail 7 is supplied with water from a water tank 15 .
  • the water is supplied to the distribution line 7 via a water line 17 with the aid of a conveying element 16 .
  • the conveying element 16 is designed as a pump which is arranged outside of the water tank 15 and can be driven by an electric motor.
  • the conveying element 16 can be arranged in the water tank 15 or integrated into the bottom of the tank.
  • the conveying element 16 can be designed in such a way that it enables the conveying direction to be reversed in order to be able to empty the lines and/or components of the system, which are sensitive to ice pressure, in particular the injection valves 1, by sucking back.
  • a shut-off element 18 in particular a check valve, can be arranged in the water line 17 upstream of the conveying element 16 .
  • a filter 19 is arranged upstream of the shut-off element 18 and prevents harmful particles from entering the delivery element 16 and the injection valves 1 .
  • a return line 22 branches off from the water line 17 downstream of the conveying element 16 and ends in the water tank 15 .
  • An excess delivery quantity of the delivery element 16 can be fed back into the water tank 15 via the return line 22 , for example in order to regulate the pressure in the distribution line 7 .
  • a pressure sensor 23 can be provided in the distributor line 7 or in the water line 17 for pressure regulation.
  • a non-return valve 20 is provided in the return line 22 so that no water is sucked in from the water tank 15 via the return line 22 during the return suction process.
  • the check valve 20 is also preceded by a throttle 21, with which a dynamic pressure can be built up to implement the pressure regulation.
  • the injection valves 1 are arranged on an intake manifold 24, via which a combustion chamber 25 of the internal combustion engine 100 is supplied with combustion air.
  • the water is thus injected outside of the combustion chamber 25 through the injection valve 1 into the intake manifold 24 of the internal combustion engine 100.
  • the water is supplied to the combustion chamber 25 together with the combustion air.
  • the fuel is injected directly into the combustion chamber 25 by means of a fuel injector 26 .

Abstract

L'invention concerne une valve d'injection (1) pour un système d'injection d'eau (50) d'un moteur à combustion interne (100), comprenant une électrovanne annulaire (2) qui agit sur un induit (3) qui peut exécuter un mouvement de course et qui est relié à un élément de valve (4), comprenant en outre un noyau cylindrique creux (5) qui est entouré au moins par endroits par l'électrovanne (2) et qui est formé sur un col d'entrée (6) ou est relié à un col d'entrée (6). Selon l'invention, la valve d'injection (1) peut être alimentée en eau par l'intermédiaire du col d'entrée (6), un corps (8) est inséré dans le col d'entrée (6), une surface latérale intérieure (61) est formée sur le col d'entrée (6) dans un corps de réception (60) du col d'entrée (6), une surface latérale extérieure (81) est formée sur le corps (8), la surface latérale extérieure (81) du corps (8) étant en contact direct au moins par endroits avec la surface latérale intérieure (61) du col d'entrée (6) de sorte qu'au moins un canal d'écoulement (9) se forme dans la direction axiale (a) entre la surface latérale extérieure (81) du corps (8) et la surface latérale intérieure (61) du col d'entrée (6), un canal d'écoulement (9) formé entre le corps (8) et le col d'entrée délimitant au moins une ouverture d'entrée (10) pour alimenter la valve d'injection (9) en eau.
PCT/EP2021/072911 2020-09-29 2021-08-18 Valve d'injection pour un système d'injection d'eau d'un moteur à combustion interne et système d'injection d'eau équipé d'une telle valve d'injection WO2022069108A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020212241.5 2020-09-29
DE102020212241.5A DE102020212241A1 (de) 2020-09-29 2020-09-29 Einspritzventil für ein Wassereinspritzsystem eines Verbrennungsmotors sowie Wassereinspritzsystem mit einem solchen Einspritzventil

Publications (1)

Publication Number Publication Date
WO2022069108A1 true WO2022069108A1 (fr) 2022-04-07

Family

ID=77655534

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/072911 WO2022069108A1 (fr) 2020-09-29 2021-08-18 Valve d'injection pour un système d'injection d'eau d'un moteur à combustion interne et système d'injection d'eau équipé d'une telle valve d'injection

Country Status (2)

Country Link
DE (1) DE102020212241A1 (fr)
WO (1) WO2022069108A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010030922A1 (de) * 2010-07-05 2012-01-05 Robert Bosch Gmbh Ventil für ein strömendes Medium
DE102015208508A1 (de) 2015-05-07 2016-11-10 Robert Bosch Gmbh Wassereinspritzvorrichtung für eine Brennkraftmaschine und Verfahren zum Betreiben einer solchen Wassereinspritzvorrichtung
DE102015208472A1 (de) 2015-05-07 2016-11-10 Robert Bosch Gmbh Wassereinspritzvorrichtung einer Brennkraftmaschine
DE102018220394A1 (de) * 2018-11-28 2020-05-28 Robert Bosch Gmbh Vorrichtung zum Einspritzen von Wasser in einen Brennraum oder in einen Ansaugtrakt eines Verbrennungsmotors

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018220385A1 (de) 2018-11-28 2020-05-28 Robert Bosch Gmbh Einspritzventil für ein Wassereinspritzsystem eines Verbrennungsmotors sowie Wassereinspritzsystem mit einem solchen Einspritzventil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010030922A1 (de) * 2010-07-05 2012-01-05 Robert Bosch Gmbh Ventil für ein strömendes Medium
DE102015208508A1 (de) 2015-05-07 2016-11-10 Robert Bosch Gmbh Wassereinspritzvorrichtung für eine Brennkraftmaschine und Verfahren zum Betreiben einer solchen Wassereinspritzvorrichtung
DE102015208472A1 (de) 2015-05-07 2016-11-10 Robert Bosch Gmbh Wassereinspritzvorrichtung einer Brennkraftmaschine
DE102018220394A1 (de) * 2018-11-28 2020-05-28 Robert Bosch Gmbh Vorrichtung zum Einspritzen von Wasser in einen Brennraum oder in einen Ansaugtrakt eines Verbrennungsmotors

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