WO2019137842A1 - Valve assembly for controlling the gas pressure, fuel system comprising a valve assembly for controlling the gas pressure - Google Patents

Valve assembly for controlling the gas pressure, fuel system comprising a valve assembly for controlling the gas pressure Download PDF

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Publication number
WO2019137842A1
WO2019137842A1 PCT/EP2019/050061 EP2019050061W WO2019137842A1 WO 2019137842 A1 WO2019137842 A1 WO 2019137842A1 EP 2019050061 W EP2019050061 W EP 2019050061W WO 2019137842 A1 WO2019137842 A1 WO 2019137842A1
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WO
WIPO (PCT)
Prior art keywords
valve
gas
pressure
pressure medium
control
Prior art date
Application number
PCT/EP2019/050061
Other languages
German (de)
French (fr)
Inventor
Alexander Scheel
Dirk Vahle
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
Priority to CN201980007949.5A priority Critical patent/CN111566332B/en
Publication of WO2019137842A1 publication Critical patent/WO2019137842A1/en

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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
    • 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
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0236—Multi-way valves; Multiple valves forming a multi-way valve system
    • 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
    • F02D19/022—Control of components of the fuel supply system to adjust the fuel pressure, temperature or composition
    • 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
    • F02D19/026—Measuring or estimating parameters related to the fuel supply system
    • F02D19/027—Determining the fuel pressure, temperature or volume flow, the fuel tank fill level or a valve position
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0673—Valves; Pressure or flow regulators; Mixers
    • F02D19/0678—Pressure or flow regulators therefor; Fuel metering valves therefor
    • 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
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0233—Details of actuators therefor
    • 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
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0239—Pressure or flow regulators therefor
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0605—Control of components of the fuel supply system to adjust the fuel pressure or temperature
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • 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
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • 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

  • Valve arrangement for gas pressure control fuel system with valve arrangement for gas pressure control
  • the invention relates to a valve arrangement for gas pressure regulation in a gas rail of a fuel system for supplying an internal combustion engine with a gaseous fuel gene, in particular natural gas, with the features of the preamble of claim 1. Further, the invention relates to a fuel system for supplying an internal combustion engine with a gaseous fuel, in particular with natural gas, comprising such a valve arrangement.
  • the published patent application DE 10 2016 207 743 A1 discloses a fuel system for supplying an internal combustion engine with a gaseous fuel with a device for metering the gaseous fuel to an injector.
  • the A device comprises a pressure control unit with a shut-off valve, a Druckregelven valve and a shut-off valve, which form a structural unit.
  • the shut-off valve When the shut-off valve is open gaseous fuel is metered, the gaseous fuel first passes into a high-pressure accumulator or in a gas rail to which at least one injector is connected. By opening the shut-off valve, gaseous fuel can be removed from the gas rail, so that the gas pressure in the gas rail is lowered.
  • the control of the shut-off valve and the Ab tenuventils takes place hydraulically via the control pressure in a control chamber, which is acted upon by a hydraulic rule pressure medium, namely with diesel fuel.
  • a diesel pressure control valve is also provided, which is connected to a separate diesel cycle.
  • the hydraulic control of such a pressure control unit requires the use min least one sealing element for media separation.
  • gaseous fuel can reach the area of the diesel fuel, on the other hand, the selfl fuel can reach the area of the gaseous fuel in the path of the leakage.
  • a sealing element for example, a membrane seal are.
  • a corrugated or bellows seal can be used for media separation.
  • sealing elements often have the disadvantage that their mechanical cal load capacity is limited.
  • a corrugated or bellows seal there is also a risk of a kink if the pressure difference at the seal exceeds a certain limit value.
  • a differential pressure of about 30 bar should not be exceeded.
  • the pressure applied to the outside of the well or bellows should always be greater than the pressure inside.
  • the present invention seeks to further develop a valve assembly for gas pressure control in a gas rail of a fuel system such that a secure media separation over the life of the valve assembly is achieved.
  • valve assembly is proposed with the features of claim 1.
  • Advantageous developments of the invention can be found in the dependent claims.
  • a fuel system is provided with a Ventila invention arrangement.
  • the proposed valve arrangement is used for gas pressure control in a gas rail of a fuel system for supplying an internal combustion engine with a gasförmi conditions fuel, which may be in particular natural gas.
  • the Ventilanord voltage comprises a first valve for connecting the gas rail with a high-pressure gas storage, a second valve for connecting the gas rail with a gas return and a coaxially arranged to the first and the second valve control piston, in the axial direction limited a beank with a hydraulic pressure medium beatable control room.
  • the control piston delimits, in the radial direction, a pressure medium leakage space which is separated by a sealing element from the gas Return is separated and connectable via a pressure medium shut-off valve with a pressure medium return line.
  • the pressure medium leakage amount is thus collected in the pressure medium leakage chamber and selectively discharged via the pressure medium-Ab Kunststoffventil from the pressure fluid leakage chamber.
  • the pressure in the pressure fluid leakage chamber does not rise above a predetermined limit value.
  • the pressure in the Druckmit tel-leakage chamber can be adjusted so that outside the sealing element, a higher pressure than the inside is applied.
  • the load on the sealing element can be lowered, whereby the functional reliability increases.
  • control chamber and the pressure fluid leakage chamber are each connected via an inlet throttle with a pressure medium inlet.
  • both rooms are permanently connected to the pressure medium inlet, whereby the respective inlet throttle ensures that the inlet is throttled.
  • the shut-off valve is opened to lower the pressure in the pressure fluid leakage chamber flows more than inflow. If the shut-off valve remains closed, pressure medium flows continuously through the inlet throttle into the pressure-medium leakage space so that, if required, the pressure in the pressure-medium leakage space can be lifted.
  • control chamber via a further pressure medium shut-off valve with the pressure medium return line is connected.
  • the Ab juryventile which serve to relieve the pressure fluid leakage chamber and the control chamber, each electrically, in particular electromagnetically controlled to selectively control the pressure in the pressure fluid leakage chamber or in the control room.
  • the Ab horrventile can be bound for this purpose to a control unit.
  • a pressure sensor be arranged in the pressure fluid leakage chamber and / or in the gas return.
  • the pressure applied to the outside and / or inside of the sealing element can be monitored. If a pressure sensor is provided in both rooms, the pressure difference can be determined and readjusted when exceeding a predetermined limit value via the shut-off valve assigned in the pressure medium leakage chamber.
  • the shut-off valve assigned in the pressure medium leakage chamber On the sealing element are therefore essentially only the th by the Ventil thoroughlyzei resulting pressure differences. These pressure differences are smaller than the tolerable starting value of about 30 bar. This results in positive effects towards the possible applications, functionality, durability, space and Kos th for the valve assembly for gas pressure control.
  • the at least one pressure sensor is preferably connected to a control unit, which evaluates the measured values and, if necessary, activates the shut-off valve.
  • the control unit evaluates the measured values and, if necessary, activates the shut-off valve.
  • the measured values recorded by means of a plurality of pressure sensors can be compared.
  • a certain external pressure can be set as a hard demand, so that is reacted immediately at a different measured values by changing the intrinsic pressure. It can also be a permissible over- or Unterschreitu ng a predetermined pressure difference of, for example, 10 bar stored in the control unit.
  • the proposed valve arrangement is used in such a way that a continuous electrical balance of the externally and internally applied to the sealing element pressures takes place. In this way a reliable media separation over the lifetime is achieved.
  • the sealing element is preferably a metallic corrugated or bellows, on the one hand on the control piston, on the other hand, the housing side is fixed.
  • the sealing element therefore does not substantially limit the mobility of the control piston.
  • the first valve has a valve lifter which can be moved back and forth in the axial direction and which is axially prestressed by the spring force of a spring against a valve seat.
  • the first valve may be formed in example analogous to a valve often used in high-pressure fuel pumps. In this way, existing components can be used, so that the production costs decrease.
  • the second valve has a reciprocating Chen valve piston which is axially biased by the spring force of a spring against a valve seat, wherein the valve seat is formed in the control piston.
  • the spring for biasing the valve piston may be supported on the one hand on the valve piston, on the other hand on the valve stem or on a spring plate connected to the valve stem. In this way, the valve piston can be used at the same time for actuating the valve stem.
  • the design of the valve seat in the control piston has the advantage that a compact construction valve arrangement is provided, are arranged in the control piston, valve piston and valve tappet on a common longitudinal axis.
  • control piston is designed in several parts in order to simplify the manufacture and / or the assembly of the control piston.
  • control piston is axially biased in the direction of the control chamber by the spring force of a spring. The spring helps to open the second valve.
  • the additionally proposed fuel system serves to supply an internal combustion engine with a gaseous fuel, in particular with natural gas. It is characterized in that it comprises a valve arrangement according to the invention for gas pressure regulation in a gas rail.
  • the valve assembly 1 is used to control the gas pressure in a gas rail 2 of a fuel system for supplying an internal combustion engine with a gaseous fuel, which may be in particular gas.
  • the valve arrangement 1 shown has a first valve 3 for connecting the gas rail 2 to a high-pressure accumulator 4 and a second valve 5 for connecting the gas rail 2 to a gas return 6.
  • the first Ven valve 3 has a reciprocating valve tappet 19 which is biased by a spring 20 against a valve seat 21.
  • the second valve 5 has a Ventilkol ben 22 which is biased by a spring 23 against a valve seat 24.
  • the Fe 34 is on the one hand on the valve piston 22, on the other hand supported on a plunger 19 connected to the valve spring plate 26. This is possible because the Ventilkol ben 22 and the valve stem 19 are arranged coaxially, that is lying on a common longitudinal axis A.
  • both valves 3, 5 via a control piston 7, which is arranged coaxially in Be train on the valve piston 22 and the valve stem 19 and in the axial direction Rich control chamber 8 limited, via a pressure medium inlet 15, in which an inlet throttle 13 is formed, can be acted upon by a hydraulic pressure medium.
  • the hydraulic pressure medium may be, for example, a liquid fuel, in particular diesel fuel. If the control chamber 8 is filled with hydraulic pressure medium, the control pressure applied to the control piston 7 rises at the end, so that the control piston 7 moves counter to the spring force of a spring 25 in the direction of the valve piston 22. The valve piston 22 comes to bear against the valve seat 24 and the second valve 5 closes.
  • the control pressure in the control chamber 8 is lowered.
  • a pressure medium shut-off valve 16 is opened, via which a connection of the control chamber 8 with a pressure fluid return 12 can be produced.
  • the discharge the control chamber 8 causes the control piston 7 now moves in the Chryslerge sat direction, wherein the valve piston 22 releases the valve stem 19 and the spring 20 pulls the valve stem 19 back into the valve seat 21.
  • the first valve 3 closes.
  • the control piston 7 continues its movement until a shoulder 27 of the valve piston 22 comes into abutment against a housing-side stop 28.
  • the control piston 7 now moves alone in the direction of the control chamber 8, so that the valve seat 24 of the second valve 5 is opened and a connection of the gas rails 2 with the gas return line 6 is made.
  • the control piston 7 is surrounded by a sealing element 10 in the form of a metallic bellows, which separates the gas return 6 from a pressure medium leakage chamber 9.
  • the pressure medium leakage chamber 9 is connected via a supply throttle 14 to the pressure medium inlet 15 on the one hand, on the other hand, via a pressure medium-Abêtventil 11 a Ver connection of the pressure medium leakage chamber 9 with the pressure fluid return 12 produced.
  • the pressure-medium shut-off valve 11 is electrically actuated in accordance with a control unit (not shown) receiving and comparing signals from a pressure medium leakage chamber 9 arranged first pressure sensor 17 and arranged in the gas return 6 second pressure sensor 18. In this way, the outside and inside of the control unit (not shown) receiving and comparing signals from a pressure medium leakage chamber 9 arranged first pressure sensor 17 and arranged in the gas return 6 second pressure sensor 18. In this way, the outside and inside of the
  • Sealing element 10 applied pressure can be adjusted so that the load on the sealing element 10 is significantly reduced. As a result, the reliability increases and permanently secure media separation is guaranteed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

The invention relates to a valve assembly (1) for controlling the gas pressure in a gas rail (2) of a fuel system for supplying a gaseous fuel, in particular natural gas, to an internal combustion engine, said valve assembly (1) comprising: - a first valve (3) for connecting the gas rail (2) to a high-pressure gas tank (4); - a second valve (5) for connecting the gas rail (2) to a gas recirculation line (6); and - a control piston (7) which runs coaxially to the first and second valves (3, 5) and, in the axial direction, delimits a control chamber (8) which can be exposed to a hydraulic pressure medium. According to the invention, in the radial direction, the control piston (7) delimits a pressure medium leakage chamber (9) which is sealed from the gas recirculation line (6) by a sealing element (10) and can be connected to a pressure medium recirculation line (12) via a pressure medium cut-off valve (11). The invention further relates to a fuel system comprising a valve assembly (1) according to the invention for controlling the gas pressure in a gas rail (2).

Description

Beschreibung  description
Titel: Title:
Ventilanordnung zur Gasdruckregelung, Kraftstoffsystem mit Ventilanordnung zur Gas druckregelung  Valve arrangement for gas pressure control, fuel system with valve arrangement for gas pressure control
Die Erfindung betrifft eine Ventilanordnung zur Gasdruckregelung in einem Gas-Rail eines Kraftstoffsystems zur Versorgung einer Brennkraftmaschine mit einem gasförmi gen Kraftstoff, insbesondere mit Erdgas, mit den Merkmalen des Oberbegriffs des An spruchs 1. Ferner betrifft die Erfindung ein Kraftstoffsystem zur Versorgung einer Brennkraftmaschine mit einem gasförmigen Kraftstoff, insbesondere mit Erdgas, um fassend eine solche Ventilanordnung. The invention relates to a valve arrangement for gas pressure regulation in a gas rail of a fuel system for supplying an internal combustion engine with a gaseous fuel gene, in particular natural gas, with the features of the preamble of claim 1. Further, the invention relates to a fuel system for supplying an internal combustion engine with a gaseous fuel, in particular with natural gas, comprising such a valve arrangement.
Stand der Technik State of the art
Aus der Offenlegungsschrift DE 10 2016 207 743 Al ist ein Kraftstoffsystem zur Ver sorgung einer Brennkraftmaschine mit einem gasförmigen Brennstoff mit einer Einrich tung zur Zumessung des gasförmigen Brennstoffs zu einem Injektor bekannt. Die Ein richtung umfasst eine Druckregeleinheit mit einem Absperrventil, einem Druckregelven til und einem Absteuerventil, die eine Baueinheit bilden. Bei geöffnetem Absperrventil wird gasförmiger Brennstoff zugemessen, wobei der gasförmige Brennstoff zunächst in einen Hochdruckspeicher bzw. in ein Gas-Rail gelangt, an dem mindestens ein Injektor angeschlossen ist. Durch Öffnen des Absteuerventils kann gasförmiger Brennstoff aus dem Gas-Rail abgeführt werden, so dass der Gasdruck im Gas-Rail gesenkt wird. Auf diese Weise ist sichergestellt, dass der Gasdruck im Gas-Rail nicht über einen vorge gebenen Grenzwert steigt. Die Steuerung des Absperrventils und des Absteuerventils erfolgt hydraulisch über den Steuerdruck in einem Steuerraum, der mit einem hydrauli schen Druckmittel, und zwar mit Dieselkraftstoff beaufschlagbar ist. Zur Veränderung des Steuerdrucks im Steuerraum ist ferner ein Dieseldrucksteuerventil vorgesehen, das an einen separaten Dieselkreislauf angeschlossen ist. Die hydraulische Steuerung einer solchen Druckregeleinheit erfordert den Einsatz min destens eines Dichtelements zur Medientrennung. Denn einerseits kann im Wege der Leckage gasförmiger Brennstoff in den Bereich des Dieselkraftstoffs, andererseits Die selkraftstoff im Weg der Leckage in den Bereich des gasförmigen Kraftstoffs gelangen. Als Dichtelement eignen sich beispielsweise eine Membrandichtung. Darüber hinaus kann auch eine Well- oder Faltenbalgdichtung zur Medientrennung eingesetzt werden. The published patent application DE 10 2016 207 743 A1 discloses a fuel system for supplying an internal combustion engine with a gaseous fuel with a device for metering the gaseous fuel to an injector. The A device comprises a pressure control unit with a shut-off valve, a Druckregelven valve and a shut-off valve, which form a structural unit. When the shut-off valve is open gaseous fuel is metered, the gaseous fuel first passes into a high-pressure accumulator or in a gas rail to which at least one injector is connected. By opening the shut-off valve, gaseous fuel can be removed from the gas rail, so that the gas pressure in the gas rail is lowered. In this way it is ensured that the gas pressure in the gas rail does not rise above a preset limit. The control of the shut-off valve and the Absteuerventils takes place hydraulically via the control pressure in a control chamber, which is acted upon by a hydraulic rule pressure medium, namely with diesel fuel. To change the control pressure in the control chamber, a diesel pressure control valve is also provided, which is connected to a separate diesel cycle. The hydraulic control of such a pressure control unit requires the use min least one sealing element for media separation. On the one hand, by means of the leakage, gaseous fuel can reach the area of the diesel fuel, on the other hand, the selfl fuel can reach the area of the gaseous fuel in the path of the leakage. As a sealing element, for example, a membrane seal are. In addition, a corrugated or bellows seal can be used for media separation.
Derartige Dichtelemente weisen jedoch häufig den Nachteil auf, dass ihre mechani sche Belastbarkeit begrenzt ist. Bei einer Well- oder Faltenbalgdichtung besteht zudem eine Knickgefahr, wenn die Druckdifferenz an der Dichtung einen bestimmten Grenz wert übersteigt. Vorzugsweise sollte ein Differenzdruck von etwa 30 bar nicht über schritten werden. Zur Verringerung der Knickgefahr sollte ferner der außen am Well oder Faltenbalg anliegende Druck immer größer als der innen anliegende Druck sein. However, such sealing elements often have the disadvantage that their mechanical cal load capacity is limited. In the case of a corrugated or bellows seal, there is also a risk of a kink if the pressure difference at the seal exceeds a certain limit value. Preferably, a differential pressure of about 30 bar should not be exceeded. To reduce the risk of buckling, the pressure applied to the outside of the well or bellows should always be greater than the pressure inside.
Ausgehend von dem vorstehend genannten Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Ventilanordnung zur Gasdruckregelung in einem Gas-Rail eines Kraftstoffsystems derart weiterzuentwickeln, dass eine sichere Medien trennung über die Lebensdauer der Ventilanordnung erreicht wird. Based on the above-mentioned prior art, the present invention seeks to further develop a valve assembly for gas pressure control in a gas rail of a fuel system such that a secure media separation over the life of the valve assembly is achieved.
Zur Lösung der Aufgabe wird die Ventilanordnung mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen. Ferner wird ein Kraftstoffsystem mit einer erfindungsgemäßen Ventila nordnung angegeben. To solve the problem, the valve assembly is proposed with the features of claim 1. Advantageous developments of the invention can be found in the dependent claims. Furthermore, a fuel system is provided with a Ventila invention arrangement.
Offenbarung der Erfindung Disclosure of the invention
Die vorgeschlagene Ventilanordnung dient der Gasdruckregelung in einem Gas-Rail eines Kraftstoffsystems zur Versorgung einer Brennkraftmaschine mit einem gasförmi gen Kraftstoff, wobei es sich insbesondere um Erdgas handeln kann. Die Ventilanord nung umfasst ein erstes Ventil zur Verbindung des Gas-Rails mit einem Gas- Hochdruckspeicher, ein zweites Ventil zur Verbindung des Gas-Rails mit einem Gas- Rücklauf und einen koaxial zum ersten und zum zweiten Ventil angeordneten Steuer kolben, der in axialer Richtung einen mit einem hydraulischen Druckmittel beauf schlagbaren Steuerraum begrenzt. Erfindungsgemäß begrenzt der Steuerkolben in ra dialer Richtung einen Druckmittel-Leckageraum, der durch ein Dichtelement vom Gas- Rücklauf getrennt und über ein Druckmittel-Absteuerventil mit einem Druckmittel- Rücklauf verbindbar ist. The proposed valve arrangement is used for gas pressure control in a gas rail of a fuel system for supplying an internal combustion engine with a gasförmi conditions fuel, which may be in particular natural gas. The Ventilanord voltage comprises a first valve for connecting the gas rail with a high-pressure gas storage, a second valve for connecting the gas rail with a gas return and a coaxially arranged to the first and the second valve control piston, in the axial direction limited a beauf with a hydraulic pressure medium beatable control room. According to the invention, the control piston delimits, in the radial direction, a pressure medium leakage space which is separated by a sealing element from the gas Return is separated and connectable via a pressure medium shut-off valve with a pressure medium return line.
Bei der vorgeschlagenen Ventilanordnung wird demnach die Druckmittel- Leckagemenge im Druckmittel- Leckageraum aufgefangen und gezielt über das Druckmittel-Absteuerventil aus dem Druckmittel- Leckageraum abgeführt. Auf diese Weise ist einerseits sichergestellt, dass der Druck im Druckmittel-Leckageraum nicht über einen vorgegebenen Grenzwert steigt. Andererseits kann der Druck im Druckmit tel-Leckageraum derart eingestellt werden, dass außen am Dichtelement ein höherer Druck als innen anliegt. Über die Druckregelung im Druckmittel- Leckageraum kann somit die Belastung des Dichtelements gesenkt werden, wodurch die Funktionssicher heit steigt. In the proposed valve arrangement, the pressure medium leakage amount is thus collected in the pressure medium leakage chamber and selectively discharged via the pressure medium-Absteuerventil from the pressure fluid leakage chamber. In this way, on the one hand, it is ensured that the pressure in the pressure fluid leakage chamber does not rise above a predetermined limit value. On the other hand, the pressure in the Druckmit tel-leakage chamber can be adjusted so that outside the sealing element, a higher pressure than the inside is applied. On the pressure control in the pressure fluid leakage chamber thus the load on the sealing element can be lowered, whereby the functional reliability increases.
Bevorzugt sind der Steuerraum und der Druckmittel-Leckageraum jeweils über eine Zulaufdrossel mit einem Druckmittel-Zulauf verbunden. Das heißt, dass beide Räume dauerhaft mit dem Druckmittel-Zulauf verbunden sind, wobei die jeweilige Zulaufdros sel dafür sorgt, dass der Zulauf gedrosselt wird. Dadurch ist beispielsweise sicherge stellt, dass bei geöffnetem Absteuerventil zur Druckabsenkung im Druckmittel- Leckageraum eine größere Menge abströmt als zuströmt. Bleibt das Absteuerventil geschlossen, strömt über die Zulaufdrossel kontinuierlich Druckmittel in den Druckmit tel-Leckageraum, so dass bei Bedarf der Druck im Druckmittel- Leckageraum angeho ben werden kann. Preferably, the control chamber and the pressure fluid leakage chamber are each connected via an inlet throttle with a pressure medium inlet. This means that both rooms are permanently connected to the pressure medium inlet, whereby the respective inlet throttle ensures that the inlet is throttled. As a result, for example, sicherge provides that when the shut-off valve is opened to lower the pressure in the pressure fluid leakage chamber flows more than inflow. If the shut-off valve remains closed, pressure medium flows continuously through the inlet throttle into the pressure-medium leakage space so that, if required, the pressure in the pressure-medium leakage space can be lifted.
Um in entsprechender Weise eine Druckabsenkung im Steuerraum zu erreichen, wird vorgeschlagen, dass auch der Steuerraum über ein weiteres Druckmittel- Absteuerventil mit dem Druckmittel- Rücklauf verbindbar ist. In order to achieve a corresponding reduction in pressure in the control chamber, it is proposed that the control chamber via a further pressure medium shut-off valve with the pressure medium return line is connected.
Vorzugsweise sind die Absteuerventile, die der Entlastung des Druckmittel- Leckageraums und des Steuerraums dienen, jeweils elektrisch, insbesondere elektro magnetisch ansteuerbar, um den Druck im Druckmittel-Leckageraum bzw. im Steuer raum gezielt zu steuern. Die Absteuerventile können hierzu an eine Steuereinheit an gebunden sein. Preferably, the Absteuerventile, which serve to relieve the pressure fluid leakage chamber and the control chamber, each electrically, in particular electromagnetically controlled to selectively control the pressure in the pressure fluid leakage chamber or in the control room. The Absteuerventile can be bound for this purpose to a control unit.
In Weiterbildung der Erfindung wird vorgeschlagen, dass im Druckmittel- Leckageraum und/oder im Gas- Rücklauf ein Drucksensor angeordnet ist. Über den mindestens einen Drucksensor kann der außen und/oder innen am Dichtelement anliegende Druck über wacht werden. Sofern in beiden Räumen ein Drucksensor vorgesehen ist, kann die Druckdifferenz ermittelt und bei Übersteigen eines vorgegebenen Grenzwerts über das im dem Druckmittel- Leckageraum zugeordnete Absteuerventil neu eingestellt werden. Am Dichtelement liegen daher im Wesentlichen lediglich die durch die Ventilsteuerzei ten entstehenden Druckdifferenzen an. Diese Druckdifferenzen sind kleiner als der er trägliche Ausgangswert von etwa 30 bar. Hieraus ergeben sich positive Effekte hin sichtlich der Einsatzmöglichkeiten, Funktionalität, Dauerhaltbarkeit, Bauraum und Kos ten für die Ventilanordnung zur Gasdruckregelung. In a further development of the invention, it is proposed that a pressure sensor be arranged in the pressure fluid leakage chamber and / or in the gas return. About the at least one Pressure sensor, the pressure applied to the outside and / or inside of the sealing element can be monitored. If a pressure sensor is provided in both rooms, the pressure difference can be determined and readjusted when exceeding a predetermined limit value via the shut-off valve assigned in the pressure medium leakage chamber. On the sealing element are therefore essentially only the th by the Ventilsteuerzei resulting pressure differences. These pressure differences are smaller than the tolerable starting value of about 30 bar. This results in positive effects towards the possible applications, functionality, durability, space and Kos th for the valve assembly for gas pressure control.
Aufgrund der Regelbarkeit des Drucks im Druckmittel- Leckageraum kann auch der Gasdruck im Gas- Rücklauf beliebig hoch gewählt werden, wodurch sich ganz neue Möglichkeiten hinsichtlich der konkreten Ausgestaltung des Kraftstoffsystems ergeben, in das die Ventilanordnung integriert ist. Beispielsweise kann auf einen separaten Gas- Leckage-Anschluss verzichtet werden. Due to the controllability of the pressure in the pressure fluid leakage chamber and the gas pressure in the gas return can be selected arbitrarily high, resulting in completely new possibilities with respect to the specific design of the fuel system, in which the valve assembly is integrated. For example, can be dispensed with a separate gas leakage connection.
Der mindestens eine Drucksensor ist vorzugsweise an eine Steuereinheit angebunden, welche die Messwerte auswertet und bei Bedarf das Absteuerventil ansteuert. In der Steuereinheit können die mittels mehrerer Drucksensoren erfassten Messwerte vergli chen werden. Ferner kann ein bestimmter Außendruck als harte Forderung eingestellt werden, so dass bei abweichenden Messwerten sofort durch eine Änderung des In nendrucks reagiert wird. Es kann auch eine zulässige Über- oder Unterschreitu ng einer vorgegebenen Druckdifferenz von beispielsweise 10 bar in der Steuereinheit hinterlegt sein. Dadurch werden Ventilhübe lediglich aufgrund kleiner Gasdruckschwankungen verhindert, so dass das Absteuerventil weniger beansprucht wird. The at least one pressure sensor is preferably connected to a control unit, which evaluates the measured values and, if necessary, activates the shut-off valve. In the control unit, the measured values recorded by means of a plurality of pressure sensors can be compared. Furthermore, a certain external pressure can be set as a hard demand, so that is reacted immediately at a different measured values by changing the intrinsic pressure. It can also be a permissible over- or Unterschreitu ng a predetermined pressure difference of, for example, 10 bar stored in the control unit. As a result, valve lifts are prevented only due to small gas pressure fluctuations, so that the shut-off valve is less stressed.
Bevorzugt wird die vorgeschlagene Ventilanordnung in der Weise eingesetzt, dass ein ständiger elektrischer Abgleich der außen und innen am Dichtelement anliegenden Drücke stattfindet. Auf diese Weise wird eine zuverlässige Medientrennung über die Lebensdauer erreicht. Preferably, the proposed valve arrangement is used in such a way that a continuous electrical balance of the externally and internally applied to the sealing element pressures takes place. In this way a reliable media separation over the lifetime is achieved.
Das Dichtelement ist vorzugsweise ein metallischer Well- oder Faltenbalg, der einer seits am Steuerkolben, andererseits gehäuseseitig befestigt ist. Das Dichtelement schränkt demnach die Beweglichkeit des Steuerkolbens nicht wesentlich ein. Gemäß einer bevorzugten Ausführungsform der Erfindung weist das erste Ventil einen in axialer Richtung hin- und herbeweglichen Ventilstößel auf, der durch die Federkraft einer Feder gegen einen Ventilsitz axial vorgespannt ist. Das erste Ventil kann bei spielsweise analog eines bei Kraftstoffhochdruckpumpen oftmals eingesetzten Säug ventils ausgebildet sein. Auf diese Weise kann auf bereits bestehende Komponenten zurückgegriffen werden, so dass die Herstellungskosten sinken. The sealing element is preferably a metallic corrugated or bellows, on the one hand on the control piston, on the other hand, the housing side is fixed. The sealing element therefore does not substantially limit the mobility of the control piston. According to a preferred embodiment of the invention, the first valve has a valve lifter which can be moved back and forth in the axial direction and which is axially prestressed by the spring force of a spring against a valve seat. The first valve may be formed in example analogous to a valve often used in high-pressure fuel pumps. In this way, existing components can be used, so that the production costs decrease.
Des Weiteren wird vorgeschlagen, dass das zweite Ventil einen hin- und herbewegli chen Ventilkolben aufweist, der durch die Federkraft einer Feder gegen einen Ventilsitz axial vorgespannt ist, wobei der Ventilsitz im Steuerkolben ausgebildet ist. Die Feder zur Vorspannung des Ventilkolbens kann einerseits am Ventilkolben, andererseits am Ventilstößel bzw. an einem mit dem Ventilstößel verbundenen Federteller abgestützt sein. Auf diese Weise kann der Ventilkolben zugleich zur Betätigung des Ventilstößels eingesetzt werden. Die Ausbildung des Ventilsitzes im Steuerkolben besitzt den Vorteil, dass eine kompaktbauende Ventilanordnung geschaffen wird, bei der Steuerkolben, Ventilkolben und Ventilstößel auf einer gemeinsamen Längsachse angeordnet sind. It is also proposed that the second valve has a reciprocating Chen valve piston which is axially biased by the spring force of a spring against a valve seat, wherein the valve seat is formed in the control piston. The spring for biasing the valve piston may be supported on the one hand on the valve piston, on the other hand on the valve stem or on a spring plate connected to the valve stem. In this way, the valve piston can be used at the same time for actuating the valve stem. The design of the valve seat in the control piston has the advantage that a compact construction valve arrangement is provided, are arranged in the control piston, valve piston and valve tappet on a common longitudinal axis.
Vorteilhafterweise ist der Steuerkolben mehrteilig ausgeführt, um die Fertigung und/oder die Montage des Steuerkolbens zu vereinfachen. Alternativ oder ergänzend wird vorgeschlagen, dass der Steuerkolben in Richtung des Steuerraums durch die Federkraft einer Feder axial vorgespannt ist. Die Feder unterstützt das Öffnen des zweiten Ventils. Advantageously, the control piston is designed in several parts in order to simplify the manufacture and / or the assembly of the control piston. Alternatively or additionally, it is proposed that the control piston is axially biased in the direction of the control chamber by the spring force of a spring. The spring helps to open the second valve.
Das darüber hinaus vorgeschlagene Kraftstoffsystem dient der Versorgung einer Brennkraftmaschine mit einem gasförmigen Kraftstoff, insbesondere mit Erdgas. Es zeichnet sich dadurch aus, dass es eine erfindungsgemäße Ventilanordnung zur Gas druckregelung in einem Gas-Rail umfasst. Die zuvor in Zusammenhang mit der Ven tilanordnung beschriebenen Vorteile erstecken sich auch auf das Kraftstoffsystem. Ins besondere kann eine hohe Funktionssicherheit des zur Medientrennung eingesetzten Dichtelements erreicht werden. The additionally proposed fuel system serves to supply an internal combustion engine with a gaseous fuel, in particular with natural gas. It is characterized in that it comprises a valve arrangement according to the invention for gas pressure regulation in a gas rail. The advantages previously described in connection with the Ven tilanordnung also extend to the fuel system. In particular, a high reliability of the sealing element used for media separation can be achieved.
Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der beigefügten Zeichnung näher erläutert. Diese zeigt einen schematischen Längsschnitt durch eine erfindungsgemäße Ventilanordnung für ein erfindungsgemäßes Kraft stoffsystem. Ausführliche Beschreibung der Zeichnung A preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings. This shows a schematic longitudinal section through a valve arrangement according to the invention for a fuel system according to the invention. Detailed description of the drawing
Die in der Figur dargestellte erfindungsgemäße Ventilanordnung 1 dient der Gasdruck regelung in einem Gas-Rail 2 eines Kraftstoffsystems zur Versorgung einer Brenn kraftmaschine mit einem gasförmigen Kraftstoff, wobei es sich insbesondere um Erd gas handeln kann. Hierzu weist die dargestellte Ventilanordnung 1 ein erstes Ventil 3 zur Verbindung des Gas-Rails 2 mit einem Hochdruckspeichers 4 sowie ein zweites Ventil 5 zur Verbindung des Gas-Rails 2 mit einem Gas-Rücklauf 6 auf. Das erste Ven til 3 weist einen hin- und herbeweglichen Ventilstößel 19 auf, der mittels einer Feder 20 gegen einen Ventilsitz 21 vorgespannt ist. Das zweite Ventil 5 besitzt einen Ventilkol ben 22, der mittels einer Feder 23 gegen einen Ventilsitz 24 vorgespannt ist. Die Fe der 34 ist hierzu einerseits am Ventilkolben 22, andererseits an einem mit dem Ventil stößel 19 verbundenen Federteller 26 abgestützt. Dies ist möglich, da der Ventilkol ben 22 und der Ventilstößel 19 koaxial angeordnet sind, das heißt auf einer gemein samen Längsachse A liegend. The valve assembly 1 according to the invention shown in the figure is used to control the gas pressure in a gas rail 2 of a fuel system for supplying an internal combustion engine with a gaseous fuel, which may be in particular gas. For this purpose, the valve arrangement 1 shown has a first valve 3 for connecting the gas rail 2 to a high-pressure accumulator 4 and a second valve 5 for connecting the gas rail 2 to a gas return 6. The first Ven valve 3 has a reciprocating valve tappet 19 which is biased by a spring 20 against a valve seat 21. The second valve 5 has a Ventilkol ben 22 which is biased by a spring 23 against a valve seat 24. The Fe 34 is on the one hand on the valve piston 22, on the other hand supported on a plunger 19 connected to the valve spring plate 26. This is possible because the Ventilkol ben 22 and the valve stem 19 are arranged coaxially, that is lying on a common longitudinal axis A.
Die Betätigung beider Ventile 3, 5 erfolgt über einen Steuerkolben 7, der koaxial in Be zug auf den Ventilkolben 22 und den Ventilstößel 19 angeordnet ist und in axialer Rich tung einen Steuerraum 8 begrenzt, der über einen Druckmittel-Zulauf 15, in dem eine Zulaufdrossel 13 ausgebildet ist, mit einem hydraulischen Druckmittel beaufschlagbar ist. Bei dem hydraulischen Druckmittel kann es sich beispielsweise um einen flüssigen Kraftstoff, insbesondere Dieselkraftstoff, handeln. Füllt sich der Steuerraum 8 mit hyd raulischem Druckmittel, steigt der am Steuerkolben 7 stirnseitig anliegende Steuer druck an, so dass sich der Steuerkolben 7 entgegen der Federkraft einer Feder 25 in Richtung des Ventilkolbens 22 bewegt. Der Ventilkolben 22 gelangt zur Anlage am Ventilsitz 24 und das zweite Ventil 5 schließt. Die fortgesetzte Bewegung des Steuer kolbens 7, bei der der Steuerkolben 7 den Ventilkolben 22 mitführt, bewirkt, dass der Ventilstößel 19 des ersten Ventils 3 betätigt wird und das erste Ventil 3 öffnet. In dieser Schaltstellung vermag gasförmiger Kraftstoff aus dem Hochdruckspeicher 4 in das Gas-Rail 2 zu strömen. The actuation of both valves 3, 5 via a control piston 7, which is arranged coaxially in Be train on the valve piston 22 and the valve stem 19 and in the axial direction Rich control chamber 8 limited, via a pressure medium inlet 15, in which an inlet throttle 13 is formed, can be acted upon by a hydraulic pressure medium. The hydraulic pressure medium may be, for example, a liquid fuel, in particular diesel fuel. If the control chamber 8 is filled with hydraulic pressure medium, the control pressure applied to the control piston 7 rises at the end, so that the control piston 7 moves counter to the spring force of a spring 25 in the direction of the valve piston 22. The valve piston 22 comes to bear against the valve seat 24 and the second valve 5 closes. The continued movement of the control piston 7, in which the control piston 7 carries the valve piston 22, causes the valve stem 19 of the first valve 3 is actuated and the first valve 3 opens. In this switching position, gaseous fuel can flow from the high-pressure accumulator 4 into the gas rail 2.
Um das erste Ventil 3 zu schließen, wird der Steuerdruck im Steuerraum 8 gesenkt. Hierzu wird ein Druckmittel-Absteuerventil 16 geöffnet, über welches eine Verbindung des Steuerraums 8 mit einem Druckmittel- Rücklauf 12 herstellbar ist. Die Entlastung des Steuerraums 8 bewirkt, dass der Steuerkolben 7 sich nunmehr in die entgegenge setzte Richtung bewegt, wobei sich der Ventilkolben 22 vom Ventilstößel 19 löst und die Feder 20 den Ventilstößel 19 wieder in den Ventilsitz 21 zieht. Das erste Ventil 3 schließt. Der Steuerkolben 7 setzt seine Bewegung fort, bis eine Schulter 27 des Ven- tilkolbens 22 zur Anlage an einem gehäuseseitigen Anschlag 28 gelangt. Der Steuer kolben 7 bewegt sich nunmehr alleine weiter in Richtung des Steuerraums 8, so dass der Ventilsitz 24 des zweiten Ventils 5 geöffnet wird und eine Verbindung des Gas- Rails 2 mit dem Gas- Rücklauf 6 hergestellt ist. Zur Medientrennung ist der Steuerkolben 7 von einem Dichtelement 10 in Form eines metallischen Faltenbalgs umgeben, das den Gas- Rücklauf 6 von einem Druckmittel- Leckageraum 9 trennt. Um den Druck im Druckmittel- Leckageraum 9 und damit die am Dichtelement 10 anliegende Druckdifferenz gezielt einstellen zu können, ist der Druck mittel-Leckageraum 9 einerseits über eine Zulaufdrossel 14 mit dem Druckmittel- Zulauf 15 verbunden, andererseits ist über ein Druckmittel-Absteuerventil 11 eine Ver bindung des Druckmittel-Leckageraums 9 mit dem Druckmittel- Rücklauf 12 herstellbar. Das Druckmittel-Absteuerventil 11 wird elektrisch nach Maßgabe einer Steuereinheit (nicht dargestellt) betätigt, die Signale von einem im Druckmittel- Leckageraum 9 ange ordneten ersten Drucksensor 17 und einem im Gas-Rücklauf 6 angeordneten zweiten Drucksensor 18 erhält und vergleicht. Auf diese Weise kann der außen und innen amTo close the first valve 3, the control pressure in the control chamber 8 is lowered. For this purpose, a pressure medium shut-off valve 16 is opened, via which a connection of the control chamber 8 with a pressure fluid return 12 can be produced. The discharge the control chamber 8 causes the control piston 7 now moves in the entgegenge sat direction, wherein the valve piston 22 releases the valve stem 19 and the spring 20 pulls the valve stem 19 back into the valve seat 21. The first valve 3 closes. The control piston 7 continues its movement until a shoulder 27 of the valve piston 22 comes into abutment against a housing-side stop 28. The control piston 7 now moves alone in the direction of the control chamber 8, so that the valve seat 24 of the second valve 5 is opened and a connection of the gas rails 2 with the gas return line 6 is made. For the separation of media, the control piston 7 is surrounded by a sealing element 10 in the form of a metallic bellows, which separates the gas return 6 from a pressure medium leakage chamber 9. In order to set the pressure in the pressure fluid leakage chamber 9 and thus the pressure element 10 applied pressure difference targeted, the pressure medium leakage chamber 9 is connected via a supply throttle 14 to the pressure medium inlet 15 on the one hand, on the other hand, via a pressure medium-Absteuerventil 11 a Ver connection of the pressure medium leakage chamber 9 with the pressure fluid return 12 produced. The pressure-medium shut-off valve 11 is electrically actuated in accordance with a control unit (not shown) receiving and comparing signals from a pressure medium leakage chamber 9 arranged first pressure sensor 17 and arranged in the gas return 6 second pressure sensor 18. In this way, the outside and inside of the
Dichtelement 10 anliegende Druck derart eingestellt werden, dass die Belastung des Dichtelements 10 deutlich reduziert ist. In der Folge steigt die Funktionssicherheit und eine auf Dauer sichere Medientrennung ist gewährleistet. Sealing element 10 applied pressure can be adjusted so that the load on the sealing element 10 is significantly reduced. As a result, the reliability increases and permanently secure media separation is guaranteed.

Claims

Ansprüche claims
1. Ventilanordnung (1) zur Gasdruckregelung in einem Gas-Rail (2) eines Kraft stoffsystems zur Versorgung einer Brennkraftmaschine mit einem gasförmigen Kraft stoff, insbesondere mit Erdgas, umfassend 1. Valve arrangement (1) for gas pressure regulation in a gas rail (2) of a fuel system for supplying an internal combustion engine with a gaseous fuel, in particular with natural gas, comprising
ein erstes Ventil (3) zur Verbindung des Gas-Rails (2) mit einem Gas- Hochdruckspeicher (4),  a first valve (3) for connecting the gas rail (2) to a high-pressure gas reservoir (4),
ein zweites Ventil (5) zur Verbindung des Gas-Rails (2) mit einem Gas- Rücklauf (6) und  a second valve (5) for connecting the gas rail (2) with a gas return line (6) and
einen koaxial zum ersten und zum zweiten Ventil (3, 5) angeordneten Steuerkol ben (7), der in axialer Richtung einen mit einem hydraulischen Druckmittel beauf schlagbaren Steuerraum (8) begrenzt,  a coaxially with the first and the second valve (3, 5) arranged Steuerkol ben (7) which limits in the axial direction beauf with a hydraulic pressure medium beatable control chamber (8),
dadurch gekennzeichnet, dass der Steuerkolben (7) in radialer Richtung einen Druckmittel- Leckageraum (9) begrenzt, der durch ein Dichtelement (10) vom Gas- Rücklauf (6) getrennt und über ein Druckmittel-Absteuerventil (11) mit einem Druckmit tel-Rücklauf (12) verbindbar ist. characterized in that the control piston (7) in the radial direction delimits a pressure fluid leakage chamber (9) separated by a sealing element (10) from the gas return line (6) and via a pressure medium shut-off valve (11) with a Druckmit tel- Return (12) is connectable.
2. Ventilanordnung (1) nach Anspruch 1, 2. Valve arrangement (1) according to claim 1,
dadurch gekennzeichnet, dass der Steuerraum (8) und der Druckmittel- Leckageraum (9) jeweils über eine Zulaufdrossel (13, 14) mit einem Druckmittel- Zulauf (15) verbunden sind. characterized in that the control chamber (8) and the pressure fluid leakage chamber (9) in each case via an inlet throttle (13, 14) with a pressure medium inlet (15) are connected.
3. Ventilanordnung (1) nach Anspruch 1 oder 2, 3. Valve arrangement (1) according to claim 1 or 2,
dadurch gekennzeichnet, dass der Steuerraum (8) über ein weiteres Druckmittel- Absteuerventil (16) mit dem Druckmittel- Rücklauf (12) verbindbar ist. characterized in that the control chamber (8) via a further pressure medium shut-off valve (16) with the pressure medium return line (12) is connectable.
4. Ventilanordnung (1) nach einem der vorhergehenden Ansprüche, 4. Valve arrangement (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass im Druckmittel- Leckageraum (9) und/oder im Gas- Rücklauf (6) ein Drucksensor (17, 18) angeordnet ist. characterized in that in the pressure medium leakage chamber (9) and / or in the gas return line (6), a pressure sensor (17, 18) is arranged.
5. Ventilanordnung (1) nach einem der vorhergehenden Ansprüche, 5. Valve arrangement (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass das Dichtelement (10) ein metallischer Well- oder Fal tenbalg ist, der einerseits am Steuerkolben (7), andererseits gehäuseseitig befestigt ist. characterized in that the sealing element (10) is a metallic corrugated or Fal tenbalg, on the one hand on the control piston (7), on the other hand, the housing side is fixed.
6. Ventilanordnung (1) nach einem der vorhergehenden Ansprüche, 6. Valve arrangement (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass das erste Ventil (3) einen in axialer Richtung hin- und herbeweglichen Ventilstößel (19) aufweist, der durch die Federkraft einer Feder (20) gegen einen Ventilsitz (21) axial vorgespannt ist. characterized in that the first valve (3) has a valve lifter (19) which can be moved back and forth in the axial direction and which is axially preloaded by the spring force of a spring (20) against a valve seat (21).
7. Ventilanordnung (1) nach einem der vorhergehenden Ansprüche, 7. Valve arrangement (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass das zweite Ventil (5) einen hin- und herbeweglichen Ventilkolben (22) aufweist, der durch die Federkraft einer Feder (23) gegen einen Ven tilsitz (24) axial vorgespannt ist, wobei der Ventilsitz (24) im Steuerkolben (7) ausgebil- det ist. characterized in that the second valve (5) comprises a reciprocating valve piston (22) which is biased axially by the spring force of a spring (23) against a Ven tilsitz (24), wherein the valve seat (24) in the control piston ( 7) is formed.
8. Ventilanordnung (1) nach einem der vorhergehenden Ansprüche, 8. Valve arrangement (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass der Steuerkolben (7) mehrteilig ausgeführt ist und/oder in Richtung des Steuerraums (8) durch die Federkraft einer Feder (25) axial vorgespannt ist. characterized in that the control piston (7) is designed in several parts and / or axially biased in the direction of the control chamber (8) by the spring force of a spring (25).
9. Kraftstoffsystem zur Versorgung einer Brennkraftmaschine mit einem gasförmigen Kraftstoff, insbesondere mit Erdgas, umfassend eine Ventilanordnung (1) nach einem der vorhergehenden Ansprüche zur Gasdruckregelung in einem Gas- Rail (2). 9. Fuel system for supplying an internal combustion engine with a gaseous fuel, in particular with natural gas, comprising a valve arrangement (1) according to one of the preceding claims for gas pressure regulation in a gas rail (2).
PCT/EP2019/050061 2018-01-10 2019-01-03 Valve assembly for controlling the gas pressure, fuel system comprising a valve assembly for controlling the gas pressure WO2019137842A1 (en)

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CN111566332A (en) 2020-08-21
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