EP3286421A1 - Dual-fuel internal combustion engine - Google Patents

Dual-fuel internal combustion engine

Info

Publication number
EP3286421A1
EP3286421A1 EP16722773.5A EP16722773A EP3286421A1 EP 3286421 A1 EP3286421 A1 EP 3286421A1 EP 16722773 A EP16722773 A EP 16722773A EP 3286421 A1 EP3286421 A1 EP 3286421A1
Authority
EP
European Patent Office
Prior art keywords
piston
fuel
sensor
internal combustion
combustion engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16722773.5A
Other languages
German (de)
French (fr)
Inventor
Jassin Marcel Fritz
Dino Imhof
Georg Tinschmann
Christian Trapp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Innio Jenbacher GmbH and Co OG
Original Assignee
GE Jenbacher GmbH and Co OHG
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 GE Jenbacher GmbH and Co OHG filed Critical GE Jenbacher GmbH and Co OHG
Publication of EP3286421A1 publication Critical patent/EP3286421A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
    • 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
    • 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
    • F02D19/0607—Control of components of the fuel supply system to adjust the fuel mass or volume flow
    • F02D19/061—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
    • 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
    • F02D19/0626—Measuring or estimating parameters related to the fuel supply system
    • F02D19/0628—Determining the fuel pressure, temperature or 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
    • F02D19/0639—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
    • 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
    • F02D19/08—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 simultaneously using pluralities of fuels
    • F02D19/10—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 simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous
    • F02D19/105—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 simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous operating in a special mode, e.g. in a liquid fuel only mode for starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/008—Controlling each cylinder individually
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • 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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/005—Fuel-injectors combined or associated with other devices the devices being sensors
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1808—Number of cylinders two
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0614—Actual fuel mass or fuel injection amount
    • F02D2200/0616—Actual fuel mass or fuel injection amount determined by estimation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/063—Lift of the valve needle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/022—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using an optical sensor, e.g. in-cylinder light probe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/025—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining temperatures inside the cylinder, e.g. combustion temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/245—Position sensors, e.g. Hall sensors
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/247—Pressure sensors
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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 dual-fuel internal combustion engine having the features of the preamble of claim 1 and a method for operating a dual-fuel internal combustion engine.
  • Generic dual-fuel internal combustion engines are typically operated in two modes of operation. A distinction is made between a mode of operation with primarily liquid fuel supply (“liquid operation” for short, “diesel operation” in the case of using diesel as liquid fuel) and a mode of operation with primarily gaseous fuel supply, in which the liquid fuel is used as pilot fuel to start combustion Serves (also referred to as “pilot operation” or “Zündstrahl too”)). Whether liquid or pilot operation is chosen may depend on a variety of factors, such as the availability of fuel, economic considerations, or regulatory requirements.
  • the object of the invention is to provide a dual-fuel internal combustion engine and a method for operating a dual-fuel internal combustion engine, in which the disadvantageous measures described above are not required. This object is achieved by a dual-fuel internal combustion engine having the features of claim 1 and a method having the features of claim 13.
  • Advantageous embodiments of the invention are defined in the dependent claims.
  • the fuel injector for controlling the amount of fuel supplied in the ballistic range individually for each of at least Two piston-cylinder units, operated in a controlled manner, because each can be deduced to their supplied amount of liquid fuel and so this can also be regulated.
  • the ballistic region of the needle sensor is understood to be the region of the position of the injector needle between complete opening and complete closure.
  • the resolution range of such a needle sensor may be between 20% and 50% of the nominal stroke of the injector needle.
  • the internal combustion engine has at least two piston-cylinder units. Preferably, it is 12, 16, 20 or 24 piston-cylinder units. Then, according to the invention, it is provided that each of the at least two piston-cylinder units is assigned in each case at least one needle sensor.
  • the regulating device is designed to regulate the quantities of the liquid or gaseous fuel supplied to the at least two piston-cylinder units as a function of the signals characteristic of the needle positions.
  • percentages in terms of fuel amounts refer to the amount of energy supplied by each fuel quantity of the piston-cylinder unit. For example, an indication of 1% liquid fuel that 1% of the power supplied to the piston-cylinder unit amount of energy from the liquid fuel. In this example, the complementary 99% of the energy supplied is supplied by the gaseous fuel. The amount of energy corresponding to a mass flow of liquid or gaseous fuel supplied to the piston-cylinder unit is determined by the respective specific energy content of the fuels used.
  • liquid fuel examples include diesel and heavy fuel oil (HFO, "heavy fuel oil” or - especially in the marine sector - BFO “bunker fuel oil”).
  • gaseous fuels are gaseous hydrocarbons such as natural gas or biogas.
  • each of the at least two piston-cylinder units at least one connected to the control device and the respective piston-cylinder unit associated combustion sensor is provided, through which a characteristic of the respective piston-cylinder unit combustion detected signal is.
  • control device is designed to individually regulate the quantities of the liquid or gaseous fuel supplied to the at least two piston-cylinder units as a function of the signal characteristic for the respective needle position and of the signal characteristic for the respective combustion ,
  • the combustion sensor is a knock sensor, a cylinder pressure sensor, a temperature sensor (for example arranged in the combustion chamber or in the exhaust tract) or a NOx sensor.
  • misfires the occurrence of knocking and the emissions produced during combustion can be taken into account.
  • the combustion can be controlled with knowledge of the cylinder pressure in dependence of the same. This opens up the possibility compared to the embodiment with only one needle sensor, the dual-fuel Internal combustion engine with higher efficiency and / or to operate cheaper emissions.
  • the needle sensor and the combustion sensor are formed separately from each other.
  • the needle sensor and the combustion sensor are designed as one and the same sensor. Then it makes sense to form the sensor as a knock sensor (structure-borne sound sensor).
  • a knock sensor structure-borne sound sensor. It is particularly preferably provided that exactly one fuel injector for liquid fuel is provided per piston-cylinder unit, which preferably has exactly one injector needle.
  • control device is configured to individually adjust the amount of liquid fuel supplied to the at least two piston-cylinder units in a range of 0.5% (lower limit of pilot operation) to 100% (upper limit of liquid operation) to vary and accordingly to vary the amount of gaseous fuel supplied to the at least two piston-cylinder units in a range of 99.5% to 0%.
  • control device is designed to individually the amount of the at least two piston-cylinder unit supplied gaseous fuel and the amount of the at least two piston-cylinder units supplied liquid fuel in dependence of a stored or calculated profile regulate, wherein the profile defines a relationship between different operating conditions of the internal combustion engine and associated amounts of gaseous and liquid fuel.
  • the profile defines a relationship between different operating conditions of the internal combustion engine and associated amounts of gaseous and liquid fuel.
  • the optimum percentages of liquid and gaseous fuel can be stored in each case with regard to the efficiency.
  • the proportions of liquid and gaseous fuel follow the specification of whether to run a pilot operation, a liquid operation, or a mixed operation specified in terms of the maximum amount of gas.
  • the use of the profile preferably covers at least the stationary operation of the internal combustion engine.
  • the transient ranges can be driven, for example, with a fixed specification of the proportion of liquid and gaseous fuel.
  • target BMEP brake mean effective pressure
  • NOx emission limit with measured or known methane number and charge air temperature
  • a ballistic range is understood to mean operation of the fuel injector in which the injection needle moves from a "full-close” position to a “full-open” position, but does not reach it. As a result, the injection needle moves back towards the "full-closed” position without having reached the "full-open” position.
  • a high-resolution sensor with respect to the path of the injector needle may be used, or a sensor known per se may be provided which detects reaching the "full-close" position, and may also directly determine the position of the injector needle be detected via an optical sensor.
  • a needle sensor which can detect information about the binary information "full-open” or "full-closed” addition. It can be provided that the needle sensor is designed as a pressure sensor arranged in the fuel injector, as a path measuring device or as an optical sensor. A pressure sensor may be arranged, for example, on a storage volume of the fuel injector connected to the injector needle.
  • optical sensor for example, this can be directed to the injector needle itself and determine the needle position directly by visual inspection.
  • the optical sensor may be directed toward that region adjacent to the fuel injector in which the occurrence of a fuel spray is to be expected when the injector needle is open.
  • the opening duration of the injector needle can be determined directly, and from the pressure with which the liquid fuel was injected via the fuel injector (rail pressure), the actually injected amount of liquid fuel can be calculated therefrom. By adjusting the energization of the fuel injector this amount can be controlled. By adjusting the opening and closing times of the fuel injector, the injection characteristic can be varied.
  • a cooling device is provided for the fuel injector. This can prevent coking of the liquid fuel or increased wear of the fuel injector and material failure.
  • the cooling device can be designed, for example, as liquid cooling.
  • control device is designed to determine a wear characteristic of the needle sensor based on the characteristic of the needle position signal of the needle sensor. For example, a supply duration of an actuator solenoid of the injector needle required for a defined supply of fuel may be relative to an opening duration of the injector needle be observed over time and an extension of the energization be detected. This indicates wear.
  • the amount of the at least two piston-cylinder units supplied gaseous fuel and the amount of the piston-cylinder units supplied liquid fuel in Depending on a position of an injector needle of a fuel injector of the respective piston-cylinder unit for the liquid fuel and is controlled in response to a combustion taking place in the at least one piston-cylinder unit individually.
  • the quantity of liquid fuel fed to the at least two piston-cylinder units is varied individually within a range of 0.5% to 100% and, correspondingly, the quantity of gaseous fuel fed to the at least two piston-cylinder units is varied in a range of 99.5% to 0%.
  • the amount of gaseous fuel and the amount of liquid fuel supplied to the at least two piston-cylinder units is controlled individually as a function of a stored or calculated profile, wherein the profile shows a relationship between different operating states of the internal combustion engine and associated amounts of gaseous and liquid fuel.
  • the controller checks whether the injected amount of liquid fuel was too low It is inventively provided that at least two piston-cylinder units are provided and for each of the at least two piston-cylinder units, the amount of supplied gaseous fuel and the amount of supplied liquid fuel is controlled individually.
  • the internal combustion engine according to the invention is preferably a stationary internal combustion engine which is used either directly as a mechanical drive or as a drive device for a generator for generating electrical energy in a so-called genset unit.
  • the cylinders of the piston-cylinder units preferably have a bore diameter of at least 130 mm.
  • the turn down ratio is the ratio of the maximum and the minimum amount of fuel that can inject a controlled injector. If an injector can deliver a fuel quantity of 0.5% to 100%, this injector has a turn down ratio of 200.
  • an injection duration can both lengthen and shorten over the lifetime of a fuel injector.
  • the needle sensor opens up the possibility of detecting deviations in both directions. Further advantages and details of the invention will be discussed with reference to the figures. Show it:
  • Fig. 1 shows schematically an internal combustion engine according to the invention in a first
  • Fig. 3 is a control diagram for an embodiment of the invention
  • Fig. 4 is a control diagram in an alternative representation.
  • FIG. 1 schematically shows a piston-cylinder unit 3 of an internal combustion engine 1.
  • a compression device 10 is connected via a shaft with an exhaust gas turbine 1 1, in which exhaust gases of the internal combustion engine 1 are relaxed.
  • the internal combustion engine 1 to be supplied charge air or an air-fuel mixture can be compressed.
  • the piston-cylinder unit 3 of the internal combustion engine 1 can be supplied via a gas supply device 6 according to this embodiment upstream of the compression device 10 gaseous fuel. Since in this variant a mixture of air and fuel gas is compressed, it is called a mixture charging.
  • the piston-cylinder unit 3 can be supplied via the fuel injector 4 liquid fuel, such as diesel.
  • the fuel injector 4 has exactly one injector needle 5 in this exemplary embodiment. Furthermore, a cooling device 9 is formed in the fuel injector 4. This can be for example a liquid cooling.
  • the fuel injector 4 further has a needle sensor 7, by means of which the needle position of the injector needle 5 can be reported to a control device 2.
  • the needle sensor 7 may be designed, for example, as a pressure sensor arranged in the fuel injector 4, as a displacement measuring device or as an optical sensor.
  • a combustion sensor 8 is formed, from which characteristic of the combustion signals to the control device. 2 are notifiable.
  • the combustion sensor 8 may be designed, for example, as a cylinder pressure sensor, a temperature sensor or as an optical sensor.
  • the quantities of the liquid fuel supplied to the piston-cylinder unit 3 via the fuel injector 4 or the quantities of the gaseous fuel supplied via the gas supply device 6 can be controlled via the control device 2.
  • the control device 2 can be realized in a motor control of the internal combustion engine 1, or be formed separately from this.
  • the embodiment shown in Fig. 2 differs from that in Fig. 1 in that here the gas supply means 6 is formed downstream of the compression device 10.
  • the gaseous fuel is thus supplied here only immediately before the inlet valve and downstream of the compression device 10, which in this case does not compress a mixture, but charge air.
  • the gas supply device 6 may be formed, for example, as a port-injection (Pl) valve.
  • Pl port-injection
  • Fig. 3 shows a simplified control scheme for illustrating the method according to the invention.
  • gas supply means 6 Shown as boxes are the gas supply means 6, the combustion sensor 8, the fuel injector 4 and the needle sensor 7 for a piston-cylinder unit 3, which is designated as number 1 (there are therefore several piston-cylinder units 3).
  • the mentioned elements gas supply device, combustion sensor 8, fuel injector 4 and needle sensor 7 are preferably applied in several, more preferably in all piston-cylinder units 3 of the internal combustion engine 1.
  • the control device 2 first detects whether the internal combustion engine 1 is operated in dual-fuel mode.
  • Information about the position of the injector needle 5 of the fuel injector 4 is reported to the control device 2 via the needle sensor 7. This information may include, for example, whether the injector needle 5 has reached its respective end positions, how long it has been positioned in these positions or between the end positions.
  • the combustion sensor 8 provides information about the combustion in the piston-cylinder unit 3. This information can be, for example, the burning time, cylinder pressure or the cylinder temperature.
  • the control device 2 transmits commands to the actuators, gas supply device 6 and fuel injector 4.
  • Data transmitted to the fuel injector 4 can, for example, be a duration of current (DOC) or start an energization (English: Start of current, SOC) be. These are common parameters for determining the actuation characteristic of a fuel injector 4.
  • control device 2 can now correct the values (SOC, DOC) transmitted to the fuel injector 4 (SOC_cor, DOC_cor), for example if a deviation from the actual opening duration of the fuel injector 4 to the set opening duration has been detected.
  • the gas supply device 6 can receive commands from the control device 2 at opening or closing times and opening duration, resulting in the supplied amount of gaseous fuel.
  • control device 2 Other variables that can be controlled by the control device 2 are, for example, a compressor blower or a wastegate. Not instantaneously operable but capable of compensating for slower changes are, for example, adjusting a pressure of the gas supply or the rail pressure of the liquid fuel. While the gas supply device 6 and the fuel injector 4 are controlled individually for each cylinder, the actuators waste-gate, compressor-bypass, supply pressure of the gaseous fuel and rail pressure (of the liquid fuel) all concern piston-cylinder units 3, thus can not Can be varied individually for each cylinder.
  • Fig. 4 shows the control scheme of Fig. 3 in an alternative form of representation.
  • the control device 2 referred to here as ECU
  • ECU controls the actuation characteristic of the fuel injector 4 and / or optionally the gas supply device 6 for metering the gaseous fuel as a function of the received signals from the combustion sensor 8 and the needle sensor 7.
  • a cylinder-specific variation of the amount of supplied gaseous fuel can be realized for example by a port-injection valve, as it has been explained in the embodiment of FIG.
  • An alternative to the cylinder-specific variation of the supplied gaseous fuel is a variable valve train.
  • the interconnection is exemplified for two piston-cylinder units 3 (here called cylinders 1 and 2).
  • the members or the control scheme is preferably realized for several, more preferably for all piston-cylinder units 3 of the internal combustion engine 1.
  • the functional unit of fuel injector 4 and needle sensor 7 receives from the controller 2 (ECU) on the one hand the feedback from the needle sensor 7 on the actual operating characteristic of the fuel injector 4, i. Opening time, opening and closing times.
  • the functional unit of fuel injector 4 and needle sensor 7 receives commands for actuating the fuel injector 4, such as start of current (SOC) and a duration of current (DOC). From the feedback of the needle sensor 7, the controller 2 calculates and transmits, if necessary, corrected values SOC_cor and DOC_cor.

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Abstract

The invention relates to a dual-fuel internal combustion engine (1) comprising a controller (2) for controlling the internal combustion engine and at least two piston/cylinder units (3), each of which is paired with a fuel injector (4) for a liquid fuel, said fuel injector having an injector needle (5) that can assume different needle positions, and each of which is paired with a gas supply device (6) for gaseous fuel. The controller (2) is designed to actuate the fuel injector (4) and the at least one gas supply device (6) in an individual manner for selectively metering the quantity of liquid or gaseous fuel supplied to each of the at least two piston/cylinder units (3). For each of the at least two piston/cylinder units (3), at least one needle sensor (7) is provided which is connected to the controller (2) and is paired with the respective piston/cylinder unit (3). A signal which characterizes the needle position in the ballistic region can be detected by the needle sensor so that the fuel injector (4) can be operated in a controllable manner in order to regulate the supplied fuel quantity in the ballistic region in an individual manner for each of the at least two piston/cylinder units (3).

Description

Dual-Fuel-Brennkraftmaschine  Dual fuel engine
Die Erfindung betrifft eine Dual-Fuel-Brennkraftmaschine mit den Merkmalen des Oberbegriffs des Anspruch 1 sowie ein Verfahren zum Betreiben einer Dual-Fuel- Brennkraftmaschine. The invention relates to a dual-fuel internal combustion engine having the features of the preamble of claim 1 and a method for operating a dual-fuel internal combustion engine.
Gattungsgemäße Dual-Fuel-Brennkraftmaschinen werden typischerweise in zwei Betriebsmodi betrieben. Dabei unterscheidet man einen Betriebsmodus mit primär flüssiger Kraftstoff zufuhr (kurz„Flüssigbetrieb", im Falle der Verwendung von Diesel als flüssigem Kraftstoff kurz„Dieselbetrieb" genannt) und einen Betriebsmodus mit primär gasförmiger Kraftstoffzufuhr, bei welchem der flüssige Kraftstoff als Pilotkraftstoff zum Start der Verbrennung dient (auch als „Pilotbetrieb" oder „Zündstrahlbetrieb" bezeichnet). Ob Flüssig- oder Pilotbetrieb gewählt wird, kann von verschiedenen Faktoren abhängen, zum Beispiel von der Verfügbarkeit des jeweiligen Kraftstoffes, wirtschaftlichen Überlegungen oder gesetzlichen Vorschriften. Generic dual-fuel internal combustion engines are typically operated in two modes of operation. A distinction is made between a mode of operation with primarily liquid fuel supply ("liquid operation" for short, "diesel operation" in the case of using diesel as liquid fuel) and a mode of operation with primarily gaseous fuel supply, in which the liquid fuel is used as pilot fuel to start combustion Serves (also referred to as "pilot operation" or "Zündstrahlbetrieb"). Whether liquid or pilot operation is chosen may depend on a variety of factors, such as the availability of fuel, economic considerations, or regulatory requirements.
Es ist auch bekannt, bei sinkender Qualität des gasförmigen Kraftstoffes aus einem Pilotbetrieb in den Flüssigbetrieb zu wechseln. It is also known to change from a pilot operation into liquid operation with decreasing quality of the gaseous fuel.
Daneben gibt es noch Mischbetriebe, bei welchen die Mengen an gasförmigem und flüssigem Kraftstoff vergleichbar sind. Nachteilig war bisher, dass es nicht ohne weiteres möglich war, auch geringe Mengen an flüssigem Kraftstoff sicher zu dosieren, was aber im Pilotbetrieb notwendig ist. Zu diesem Zweck mussten entweder zwei verschiedene Kraftstoffinjektoren für den flüssigen Kraftstoff bereitgestellt werden (einer für größere Mengen an flüssigem Kraftstoff und einer für geringere Mengen an flüssigem Kraftstoff) oder es kam ein einziger Kraftstoffinjektor mit zwei Injektornadeln zum Einsatz (siehe zum Beispiel WO 2014/106525 A1 ). Aufgabe der Erfindung ist die Bereitstellung einer Dual-Fuel-Brennkraftmaschine und eines Verfahrens zum Betreiben einer Dual-Fuel-Brennkraftmaschine, bei welchen die oben beschriebenen nachteiligen Maßnahmen nicht erforderlich sind. Diese Aufgabe wird durch eine Dual-Fuel-Brennkraftmaschine mit den Merkmalen des Anspruchs 1 und ein Verfahren mit den Merkmalen des Anspruchs 13 gelöst. Vorteilhafte Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen definiert. In addition, there are still mixed operations in which the amounts of gaseous and liquid fuel are comparable. The disadvantage has been that it was not readily possible to dose even small amounts of liquid fuel safely, but this is necessary in pilot operation. For this purpose either two different fuel injectors for the liquid fuel had to be provided (one for larger quantities of liquid fuel and one for smaller quantities of liquid fuel) or a single fuel injector with two injector needles was used (see for example WO 2014/106525 A1). The object of the invention is to provide a dual-fuel internal combustion engine and a method for operating a dual-fuel internal combustion engine, in which the disadvantageous measures described above are not required. This object is achieved by a dual-fuel internal combustion engine having the features of claim 1 and a method having the features of claim 13. Advantageous embodiments of the invention are defined in the dependent claims.
Indem wenigstens ein mit der Regeleinrichtung verbundener und der jeweiligen Kolben- Zylinder-Einheit zugeordneter Nadelsensor vorgesehen ist, durch welchen ein für die Nadelposition im ballistischen Bereich charakteristisches Signal erfassbar ist, kann der Kraftstoffinjektor zur Regelung der zugeführten Kraftstoffmenge im ballistischen Bereich individuell für jeden der wenigstens zwei Kolben-Zylinder-Einheiten, kontrolliert betrieben werden, weil für jede auf die ihr zugeführte Menge an flüssigem Kraftstoff rückgeschlossen werden kann und so diese auch geregelt werden kann. Unter dem ballistischen Bereich des Nadelsensors ist der Bereich der Position der Injektornadel zwischen vollständiger Öffnung und vollständiger Schließung zu verstehen. Der Auflösungsbereich eines solchen Nadelsensors kann zwischen 20% und 50% des Nennhubes der Injektornadel betragen. By at least one associated with the control device and the respective piston-cylinder unit associated needle sensor is provided, through which a characteristic of the needle position ballistic signal is detected, the fuel injector for controlling the amount of fuel supplied in the ballistic range individually for each of at least Two piston-cylinder units, operated in a controlled manner, because each can be deduced to their supplied amount of liquid fuel and so this can also be regulated. The ballistic region of the needle sensor is understood to be the region of the position of the injector needle between complete opening and complete closure. The resolution range of such a needle sensor may be between 20% and 50% of the nominal stroke of the injector needle.
Erfindungsgemäß ist vorgesehen, dass die Brennkraftmaschine wenigstens zwei Kolben-Zylinder-Einheiten aufweist. Vorzugsweise sind es 12, 16, 20 oder 24 Kolben- Zylinder-Einheiten. Dann ist erfindungsgemäß vorgesehen, dass jeder der wenigstens zwei Kolben-Zylinder-Einheiten jeweils wenigstens ein Nadelsensor zugeordnet ist. According to the invention, it is provided that the internal combustion engine has at least two piston-cylinder units. Preferably, it is 12, 16, 20 or 24 piston-cylinder units. Then, according to the invention, it is provided that each of the at least two piston-cylinder units is assigned in each case at least one needle sensor.
Erfindungsgemäß ist des Weiteren vorgesehen, dass die Regeleinrichtung dazu ausgebildet ist, die Mengen des der wenigstens zwei Kolben-Zylinder-Einheiten zugeführten flüssigen bzw. gasförmigen Kraftstoffes abhängig von dem für die Nadelpositionen charakteristischen Signale zu regeln. According to the invention, it is further provided that the regulating device is designed to regulate the quantities of the liquid or gaseous fuel supplied to the at least two piston-cylinder units as a function of the signals characteristic of the needle positions.
In der vorliegenden Offenbarung beziehen sich Prozentangaben im Hinblick auf Kraftstoffmengen auf die durch die jeweilige Kraftstoffmenge der Kolben-Zylinder- Einheit zugeführte Energiemenge. So bedeutet zum Beispiel eine Angabe von 1 % flüssigem Kraftstoff, dass 1 % der der Kolben-Zylinder-Einheit zugeführten Energiemenge aus dem flüssigen Kraftstoff stammt. In diesem Beispiel werden die komplementären 99 % der zugeführten Energie durch den gasförmigen Kraftstoff geliefert. Welche Energiemenge einem der Kolben-Zylinder-Einheit zugeführten Massenstrom von flüssigem oder gasförmigen Kraftstoff entspricht, ergibt sich über den jeweiligen spezifischen Energiegehalt der zum Einsatz kommenden Kraftstoffe. In the present disclosure, percentages in terms of fuel amounts refer to the amount of energy supplied by each fuel quantity of the piston-cylinder unit. For example, an indication of 1% liquid fuel that 1% of the power supplied to the piston-cylinder unit amount of energy from the liquid fuel. In this example, the complementary 99% of the energy supplied is supplied by the gaseous fuel. The amount of energy corresponding to a mass flow of liquid or gaseous fuel supplied to the piston-cylinder unit is determined by the respective specific energy content of the fuels used.
Beispiele für flüssigen Kraftstoff sind Diesel und Schweröl (engl. HFO,„heavy fuel oil" oder - vor allem im Marinebereich - BFO„bunker fuel oil"). Beispiele für gasförmige Kraftstoffe sind gasförmige Kohlenwasserstoffe wie zum Beispiel Erdgas oder Biogas. Examples of liquid fuel are diesel and heavy fuel oil (HFO, "heavy fuel oil" or - especially in the marine sector - BFO "bunker fuel oil"). Examples of gaseous fuels are gaseous hydrocarbons such as natural gas or biogas.
Vorzugsweise ist vorgesehen, dass für jeden der wenigstens zwei Kolben-Zylinder- Einheiten wenigstens ein mit der Regeleinrichtung verbundener und der jeweiligen Kolben-Zylinder-Einheit zugeordneter Verbrennungssensor vorgesehen ist, durch welchen ein für die jeweilige Kolben-Zylinder-Einheit erfolgende Verbrennung charakteristisches Signal erfassbar ist. It is preferably provided that for each of the at least two piston-cylinder units at least one connected to the control device and the respective piston-cylinder unit associated combustion sensor is provided, through which a characteristic of the respective piston-cylinder unit combustion detected signal is.
In diesem Fall ist bevorzugt vorgesehen, dass die Regeleinrichtung dazu ausgebildet ist, die Mengen des den wenigstens zwei Kolben-Zylinder-Einheiten zugeführten flüssigen bzw. gasförmigen Kraftstoffes abhängig von dem für die jeweilige Nadelposition und von dem für die jeweilige Verbrennung charakteristischen Signal individuell zu regeln. In this case, it is preferably provided that the control device is designed to individually regulate the quantities of the liquid or gaseous fuel supplied to the at least two piston-cylinder units as a function of the signal characteristic for the respective needle position and of the signal characteristic for the respective combustion ,
Steht auch ein für die Verbrennung charakteristisches Signal zur Verfügung, ermöglicht dies eine Berücksichtigung des Verlaufes der Verbrennung in einer der wenigstens zwei Kolben-Zylinder-Einheiten bei einer Regelung der Dual-Fuel-Brennkraftmaschine. Es kann vorgesehen sein, dass der Verbrennungssensor ein Klopfsensor, ein Zylinderdrucksensor, ein Temperatursensor (zum Beispiel im Brennraum oder im Abgastrakt angeordnet) oder eine NOx-Sonde ist. Zum Beispiel können so Fehlzündungen, das Auftreten von Klopfen und die bei der Verbrennung entstehenden Emissionen berücksichtigt werden. Die Verbrennung kann bei Kenntnis des Zylinderdruckes in Abhängigkeit desselben geregelt werden. Dies eröffnet gegenüber der Ausführungsform mit lediglich einem Nadelsensor die Möglichkeit die Dual-Fuel- Brennkraftmaschine bei höherem Wirkungsgrad und/oder günstigeren Emissionen zu betreiben. If a signal characteristic of the combustion is also available, this allows consideration of the course of the combustion in one of the at least two piston-cylinder units in a regulation of the dual-fuel internal combustion engine. It can be provided that the combustion sensor is a knock sensor, a cylinder pressure sensor, a temperature sensor (for example arranged in the combustion chamber or in the exhaust tract) or a NOx sensor. For example, misfires, the occurrence of knocking and the emissions produced during combustion can be taken into account. The combustion can be controlled with knowledge of the cylinder pressure in dependence of the same. This opens up the possibility compared to the embodiment with only one needle sensor, the dual-fuel Internal combustion engine with higher efficiency and / or to operate cheaper emissions.
Es kann vorgesehen sein, dass der Nadelsensor und der Verbrennungssensor gesondert voneinander ausgebildet sind. Alternativ kann vorgesehen sein, dass der Nadelsensor und der Verbrennungssensor als ein- und derselbe Sensor ausgebildet sind. Dann bietet es sich an, den Sensor als Klopfsensor (Körperschallsensor) auszubilden. Besonders bevorzugt ist vorgesehen, dass pro Kolben-Zylinder-Einheit genau ein Kraftstoffinjektor für flüssigen Kraftstoff vorgesehen ist, der vorzugsweise genau eine Injektornadel aufweist. It can be provided that the needle sensor and the combustion sensor are formed separately from each other. Alternatively it can be provided that the needle sensor and the combustion sensor are designed as one and the same sensor. Then it makes sense to form the sensor as a knock sensor (structure-borne sound sensor). It is particularly preferably provided that exactly one fuel injector for liquid fuel is provided per piston-cylinder unit, which preferably has exactly one injector needle.
Es kann vorgesehen sein, dass die Regeleinrichtung dazu ausgebildet ist, die Menge des den wenigstens zwei Kolben-Zylinder-Einheiten zugeführten flüssigen Kraftstoffes in einem Bereich von 0,5 % (untere Grenze des Pilotbetriebs) bis 100 % (obere Grenze des Flüssigbetriebs) individuell zu variieren und entsprechend die Menge des den wenigstens zwei Kolben-Zylinder-Einheiten zugeführten gasförmigen Kraftstoffes in einem Bereich von 99,5 % bis 0 % zu variieren. It may be provided that the control device is configured to individually adjust the amount of liquid fuel supplied to the at least two piston-cylinder units in a range of 0.5% (lower limit of pilot operation) to 100% (upper limit of liquid operation) to vary and accordingly to vary the amount of gaseous fuel supplied to the at least two piston-cylinder units in a range of 99.5% to 0%.
Es kann vorgesehen sein, dass die Regeleinrichtung dazu ausgebildet ist, die Menge des den wenigstens zwei Kolben-Zylinder-Einheit zugeführten gasförmigen Kraftstoffes und die Menge des den wenigstens zwei Kolben-Zylinder-Einheiten zugeführten flüssigen Kraftstoffes in Abhängigkeit eines hinterlegten oder berechneten Profils individuell zu regeln, wobei das Profil einen Zusammenhang zwischen verschiedenen Betriebszuständen der Brennkraftmaschine und dazugehörigen Mengen an gasförmigem und flüssigem Kraftstoff definiert. Zum Beispiel können bei einer gegebenen Last der Brennkraftmaschine und einem vorgegebenen Emissionslimit als Profil die jeweils in Bezug auf den Wirkungsgrad optimalen Prozentanteile an flüssigem und gasförmigem Kraftstoff abgelegt sein. Natürlich folgen die Anteile an flüssigem und gasförmigem Kraftstoff der Vorgabe, ob ein Pilotbetrieb, ein Flüssigbetrieb oder ein hinsichtlich der maximalen Gasmenge spezifizierter Mischbetrieb gefahren werden soll. Die Verwendung des Profils deckt bevorzugt zumindest den stationären Betrieb der Brennkraftmaschine ab. Die transienten Bereiche können zum Beispiel mit einer fixen Vorgabe des Anteils an flüssigem und gasförmigem Kraftstoff gefahren werden. Ein Beispiel: It can be provided that the control device is designed to individually the amount of the at least two piston-cylinder unit supplied gaseous fuel and the amount of the at least two piston-cylinder units supplied liquid fuel in dependence of a stored or calculated profile regulate, wherein the profile defines a relationship between different operating conditions of the internal combustion engine and associated amounts of gaseous and liquid fuel. For example, for a given load of the internal combustion engine and a given emission limit as a profile, the optimum percentages of liquid and gaseous fuel can be stored in each case with regard to the efficiency. Of course, the proportions of liquid and gaseous fuel follow the specification of whether to run a pilot operation, a liquid operation, or a mixed operation specified in terms of the maximum amount of gas. The use of the profile preferably covers at least the stationary operation of the internal combustion engine. The transient ranges can be driven, for example, with a fixed specification of the proportion of liquid and gaseous fuel. An example:
Bei einem als Zielgröße vorgegebenen BMEP („Brake Mean Effective Pressure" - charakteristisch für die Last der Brennkraftmaschine) und einem vorgegebenen NOx- Emissionslimit mit gemessener oder bekannter Methanzahl und Ladelufttemperatur bestimmt man die Zielwerte der Betriebsparameter für das Effizienzmaximum in Abhängigkeit von Einspritzbeginn, Einspritzdauer, Raildruck und Luftverhältnis über einen Lookup-Table oder in Form einer mathematischen Funktion. Zu beachten ist, dass bevorzugt auch das Klopfen oder die NOx-Emissionen detektiert werden und ggf. in ausgewählte Zielwerte der Betriebsparameter eingegriffen wird um einen sicheren Betrieb zu gestatten. Liegt zum Beispiel Klopfen vor, kann die Menge an gasförmigen Kraftstoff reduziert und entsprechend die Menge an flüssigem Kraftstoff oder der Zeitpunkt der Injektion des flüssigen Kraftstoffes verändert werden.  Given a target BMEP ("brake mean effective pressure" - characteristic of the load of the internal combustion engine) and a predetermined NOx emission limit with measured or known methane number and charge air temperature one determines the target values of the operating parameters for the maximum efficiency as a function of injection start, injection duration, Rail pressure and air ratio via a lookup table or in the form of a mathematical function It should be noted that knocking or NOx emissions are preferably also detected and, if necessary, intervening in selected target values of the operating parameters to allow safe operation For example, if knocking is present, the amount of gaseous fuel may be reduced and, correspondingly, the amount of liquid fuel or the time of injection of the liquid fuel altered.
Insbesondere für den Pilotbetrieb ist es erforderlich, einen ballistischen Bereich der Injektornadel messtechnisch aufzulösen, wenn man eine Regelung der Brennkraftmaschine vornehmen will. Unter einem ballistischen Bereich versteht man einen Betrieb des Kraftstoffinjektors, bei welchem sich die Injektionsnadel ausgehend von einer „Voll-geschlossen"-Position in Richtung einer „Voll-offen"-Position bewegt, ohne diese jedoch zu erreichen. In Folge bewegt sich die Injektionsnadel wieder in Richtung der „Voll-geschlossen"-Position, ohne die „Voll-offen"-Position erreicht zu haben. In particular, for pilot operation, it is necessary to metrologically resolve a ballistic region of the injector needle, if one wants to make a control of the internal combustion engine. A ballistic range is understood to mean operation of the fuel injector in which the injection needle moves from a "full-close" position to a "full-open" position, but does not reach it. As a result, the injection needle moves back towards the "full-closed" position without having reached the "full-open" position.
Es kann zum Beispiel ein in Bezug auf den Weg der Injektornadel hochauflösender Sensor verwendet werden oder es kann ein - an sich bekannter - Sensor vorgesehen sein, der das Erreichen der „Voll-geschlossen"-Position detektiert. Es kann auch unmittelbar die Position der Injektornadel über einen optischen Sensor detektiert werden.  For example, a high-resolution sensor with respect to the path of the injector needle may be used, or a sensor known per se may be provided which detects reaching the "full-close" position, and may also directly determine the position of the injector needle be detected via an optical sensor.
Erfindungsgemäß ist ein Nadelsensor erforderlich, der Information über die binäre Information„Voll-offen" oder„Voll-geschlossen" hinaus detektieren kann. Es kann vorgesehen sein, dass der Nadelsensor als ein im Kraftstoffinjektor angeordneter Drucksensor, als Wegmesseinrichtung oder als optischer Sensor ausgebildet ist. Ein Drucksensor kann beispielsweise an einem mit der Injektornadel verbundenen Speichervolumen des Kraftstoffinjektors angeordnet sein. According to the invention, a needle sensor is required which can detect information about the binary information "full-open" or "full-closed" addition. It can be provided that the needle sensor is designed as a pressure sensor arranged in the fuel injector, as a path measuring device or as an optical sensor. A pressure sensor may be arranged, for example, on a storage volume of the fuel injector connected to the injector needle.
Im Falle eines optischen Sensors kann dieser beispielsweise auf die Injektornadel selbst gerichtet sein und unmittelbar durch visuelle Inspektion die Nadelposition ermitteln. Alternativ kann der optische Sensor auf den die jenen Bereich benachbart zum Kraftstoffinjektor gerichtet sein, in welchem bei geöffneter Injektornadel das Auftreten eines Kraftstoffsprays zu erwarten ist. In the case of an optical sensor, for example, this can be directed to the injector needle itself and determine the needle position directly by visual inspection. Alternatively, the optical sensor may be directed toward that region adjacent to the fuel injector in which the occurrence of a fuel spray is to be expected when the injector needle is open.
Aus den Werten des Nadelsensors kann die Öffnungsdauer der Injektornadel unmittelbar bestimmt werden, und über den Druck, mit welchem der flüssige Kraftstoff über den Kraftstoffinjektor eingespritzt wurde (Raildruck) kann daraus die tatsächlich eingespritzte Menge an flüssigem Kraftstoff berechnet werden. Durch Anpassung der Bestromungsdauer des Kraftstoffinjektors kann diese Menge geregelt werden. Über eine Anpassung der Öffnungs- und Schließzeitpunkte des Kraftstoffinjektors kann die Einspritzcharakteristik variiert werden. From the values of the needle sensor, the opening duration of the injector needle can be determined directly, and from the pressure with which the liquid fuel was injected via the fuel injector (rail pressure), the actually injected amount of liquid fuel can be calculated therefrom. By adjusting the energization of the fuel injector this amount can be controlled. By adjusting the opening and closing times of the fuel injector, the injection characteristic can be varied.
Man erhält durch den Nadelsensor ein zusätzliches Signal zur ohnehin verfügbaren Strom-Charakteristik der Betätigung des Kraftstoffinjektors. Somit sind Abweichungen von einer aus einer Bestromung des Kraftstoffinjektors erwarteten zu einer tatsächlichen Öffnung, also etwa einem Abheben der Injektornadel detektierbar. By means of the needle sensor, an additional signal for the already available current characteristic of the actuation of the fuel injector is obtained. Thus, deviations from an expected from an energization of the fuel injector to an actual opening, so about a lifting of the Injektornadel be detected.
Es kann vorgesehen sein, dass eine Kühleinrichtung für den Kraftstoffinjektor vorgesehen ist. Hierdurch kann ein Verkoken des flüssigen Kraftstoffes oder eine erhöhte Abnutzung des Kraftstoffinjektors und ein Material versagen verhindert werden. Die Kühleinrichtung kann zum Beispiel als Flüssigkeitskühlung ausgeführt sein. It can be provided that a cooling device is provided for the fuel injector. This can prevent coking of the liquid fuel or increased wear of the fuel injector and material failure. The cooling device can be designed, for example, as liquid cooling.
Es kann vorgesehen sein, dass die Regeleinrichtung dazu ausgebildet ist, anhand des für die Nadelposition charakteristischen Signales des Nadelsensors eine Verschleißcharakteristik des Nadelsensors festzustellen. Zum Beispiel kann eine für eine definierte Zufuhr von Kraftstoff erforderliche Bestromungsdauer eines Aktuatorsolenoids der Injektornadel relativ zu einer Öffnungsdauer der Injektornadel über die Zeit beobachtet werden und eine Verlängerung der Bestromungsdauer detektiert werden. Dies weist auf einen Verschleiß hin. It can be provided that the control device is designed to determine a wear characteristic of the needle sensor based on the characteristic of the needle position signal of the needle sensor. For example, a supply duration of an actuator solenoid of the injector needle required for a defined supply of fuel may be relative to an opening duration of the injector needle be observed over time and an extension of the energization be detected. This indicates wear.
Hier für die Betätigung des Kraftstoffinjektors über ein Solenoid (eine Spule) formuliert, gilt der Zusammenhang auch für alternative Aktuatoren, wie etwa einen Piezo-Aktuator. Formulated here for the operation of the fuel injector via a solenoid (a coil), the context also applies to alternative actuators, such as a piezo actuator.
Bei einem Verfahren zum Betreiben einer Dual-Fuel-Brennkraftmaschine, insbesondere nach einer der vorstehenden Ausführungsformen, ist vorgesehen dass die Menge des den wenigstens zwei Kolben-Zylinder-Einheiten zugeführten gasförmigen Kraftstoffes und die Menge des den Kolben-Zylinder-Einheiten zugeführten flüssigen Kraftstoffes in Abhängigkeit einer Position einer Injektornadel eines Kraftstoffinjektors der jeweiligen Kolben-Zylinder-Einheit für den flüssigen Kraftstoff und in Abhängigkeit von einer in der wenigstens einen Kolben-Zylinder-Einheit stattfindenden Verbrennung individuell geregelt wird. In a method for operating a dual-fuel internal combustion engine, in particular according to one of the preceding embodiments, it is provided that the amount of the at least two piston-cylinder units supplied gaseous fuel and the amount of the piston-cylinder units supplied liquid fuel in Depending on a position of an injector needle of a fuel injector of the respective piston-cylinder unit for the liquid fuel and is controlled in response to a combustion taking place in the at least one piston-cylinder unit individually.
Es kann vorgesehen sein, dass die Menge des den wenigstens zwei Kolben-Zylinder- Einheiten zugeführten flüssigen Kraftstoffes in einem Bereich von 0,5 % bis 100 % individuell variiert wird und entsprechend die Menge des den wenigstens zwei Kolben- Zylinder-Einheiten zugeführten gasförmigen Kraftstoffes in einem Bereich von 99,5 % bis 0 % variiert wird. It can be provided that the quantity of liquid fuel fed to the at least two piston-cylinder units is varied individually within a range of 0.5% to 100% and, correspondingly, the quantity of gaseous fuel fed to the at least two piston-cylinder units is varied in a range of 99.5% to 0%.
Es kann vorgesehen sein, dass die Menge an gasförmigen Kraftstoff und die Menge an flüssigen Kraftstoff welche den wenigstens zwei Kolben-Zylinder-Einheiten zugeführt wir, individuell in Abhängigkeit eines hinterlegten oder berechneten Profils geregelt wird, wobei das Profil einen Zusammenhang zwischen verschiedenen Betriebszuständen der Brennkraftmaschine und dazugehörigen Mengen an gasförmigem und flüssigem Kraftstoff definiert. It can be provided that the amount of gaseous fuel and the amount of liquid fuel supplied to the at least two piston-cylinder units is controlled individually as a function of a stored or calculated profile, wherein the profile shows a relationship between different operating states of the internal combustion engine and associated amounts of gaseous and liquid fuel.
Als einfache Beispiele seien genannt,  As simple examples are mentioned,
- dass wenn eine geringe Zündwilligkeit des Gemisches von Luft und gasförmigen Kraftstoff festgestellt wird, die Menge an zugeführtem flüssigen Kraftstoff erhöht wird,  that when a low ignitability of the mixture of air and gaseous fuel is detected, the amount of supplied liquid fuel is increased,
- dass wenn Klopfen detektiert wird, ein Einspritzzeitpunkt nach spät verstellt wird, that when knocking is detected, an injection timing is retarded,
- dass wenn eine Fehlzündung (misfire) festgestellt wird, die Regeleinrichtung überprüft, ob die eingespritzte Menge an flüssigem Kraftstoff zu gering war Es ist erfindungsgemäß vorgesehen, dass wenigstens zwei Kolben-Zylinder-Einheiten vorgesehen sind und für jede der wenigstens zwei Kolben-Zylinder-Einheiten die Menge an zugeführtem gasförmigen Kraftstoff und die Menge an zugeführtem flüssigen Kraftstoff individuell geregelt wird. - That if a misfire (misfire) is detected, the controller checks whether the injected amount of liquid fuel was too low It is inventively provided that at least two piston-cylinder units are provided and for each of the at least two piston-cylinder units, the amount of supplied gaseous fuel and the amount of supplied liquid fuel is controlled individually.
Bevorzugt handelt es sich bei der erfindungsgemäßen Brennkraftmaschine um eine stationäre Brennkraftmaschine, die entweder unmittelbar als mechanischer Antrieb oder als Antriebseinrichtung für einen Generator zur Erzeugung von elektrischer Energie in einer sogenannten Genset-Einheit zum Einsatz kommt. The internal combustion engine according to the invention is preferably a stationary internal combustion engine which is used either directly as a mechanical drive or as a drive device for a generator for generating electrical energy in a so-called genset unit.
Die Zylinder der Kolben-Zylinder-Einheiten weisen bevorzugt einen Bohrungsdurchmesser von mindestens 130 mm auf. The cylinders of the piston-cylinder units preferably have a bore diameter of at least 130 mm.
Die besonderen Vorteile der Erfindung sind zusammengefasst: The particular advantages of the invention are summarized:
- Kraftstoffinjektor mit feedback Signal für Position der Injektornadel von Nadelsensor erlaubt reproduzierbare Abbildung von Kleinstmengen (also sogenanntes Micropilot, unter 1 % Diesel / flüssigem Kraftstoff)  - Fuel injector with feedback signal for position of the injector needle of needle sensor allows reproducible imaging of very small quantities (so-called micropilot, below 1% diesel / liquid fuel)
- Korrektur der Einspritzmenge über Lebenszeit des Kraftstoffinjektors  - Correction of the injection quantity over the lifetime of the fuel injector
- hohes turn-down ratio abbildbar  - High turn-down ratio can be mapped
hohe„shot-to-shot accuracy" (Reproduzierbarkeit der Einspritzmengen von einem Einspritzereignis zum nächsten)  high shot-to-shot accuracy (reproducibility of injection quantities from one injection event to the next)
- Kraftstoffinjektor im ballistischen Bereich kontrollierbar betreibbar Das turn down ratio ist das Verhältnis aus der maximalen und der minimalen Kraftstoffmenge, die ein Injektor kontrolliert einspritzen kann. Kann ein Injektor eine Kraftstoffmenge von 0,5 % bis 100 % darstellen, so weist dieser Injektor ein turn down ratio von 200 auf. Zur Korrektur der Einspritzmenge über Lebenszeit des Kraftstoffinjektors sei erwähnt, dass durch Verschleiß und Ablagerung eine Einspritzdauer sich über die Lebenszeit eines Kraftstoffinjektors sowohl verlängern als auch verkürzen kann. Der Nadelsensor eröffnet die Möglichkeit, Abweichungen in beide Richtungen zu detektieren. Weitere Vorteile und Einzelheiten der Erfindung werden anhand der Figuren diskutiert. Es zeigen: - controllable controllable fuel injector in the ballistic range The turn down ratio is the ratio of the maximum and the minimum amount of fuel that can inject a controlled injector. If an injector can deliver a fuel quantity of 0.5% to 100%, this injector has a turn down ratio of 200. To correct the injection quantity over the lifetime of the fuel injector, it should be mentioned that due to wear and deposition, an injection duration can both lengthen and shorten over the lifetime of a fuel injector. The needle sensor opens up the possibility of detecting deviations in both directions. Further advantages and details of the invention will be discussed with reference to the figures. Show it:
Fig. 1 schematisch eine erfindungsgemäße Brennkraftmaschine in einem ersten Fig. 1 shows schematically an internal combustion engine according to the invention in a first
Ausführungsbeispiel,  Embodiment,
Fig. 2 schematisch eine erfindungsgemäße Brennkraftmaschine in einem weiteren Ausführungsbeispiel,  2 shows schematically an internal combustion engine according to the invention in a further embodiment,
Fig. 3 ein Regelschema zu einem Ausführungsbeispiel des erfindungsgemäßen Fig. 3 is a control diagram for an embodiment of the invention
Verfahrens für eine einzelne Kolben-Zylinder-Einheit,  Method for a single piston-cylinder unit,
Fig. 4 ein Regelschema in alternativer Darstellung. Fig. 4 is a control diagram in an alternative representation.
Figur 1 zeigt schematisch eine Kolben-Zylinder-Einheit 3 einer Brennkraftmaschine 1 . Eine Verdichtungseinrichtung 10 ist über eine Welle mit einer Abgasturbine 1 1 verbunden, in welcher Abgase der Brennkraftmaschine 1 entspannt werden. Über die Verdichtungseinrichtung 10 kann die der Brennkraftmaschine 1 zuzuführende Ladeluft bzw. ein Luft-Kraftstoff-Gemisch verdichtet werden. FIG. 1 schematically shows a piston-cylinder unit 3 of an internal combustion engine 1. A compression device 10 is connected via a shaft with an exhaust gas turbine 1 1, in which exhaust gases of the internal combustion engine 1 are relaxed. About the compression device 10, the internal combustion engine 1 to be supplied charge air or an air-fuel mixture can be compressed.
Der Kolben-Zylinder-Einheit 3 der Brennkraftmaschine 1 kann über eine Gaszufuhr- Einrichtung 6 gemäß diesem Ausführungsbeispiel stromaufwärts der Verdichtungseinrichtung 10 gasförmiger Kraftstoff zugeführt werden. Da in dieser Variante ein Gemisch von Luft und Brenngas verdichtet wird, spricht man von einer Gemischaufladung.  The piston-cylinder unit 3 of the internal combustion engine 1 can be supplied via a gas supply device 6 according to this embodiment upstream of the compression device 10 gaseous fuel. Since in this variant a mixture of air and fuel gas is compressed, it is called a mixture charging.
Der Kolben-Zylinder-Einheit 3 kann über den Kraftstoffinjektor 4 flüssiger Kraftstoff, beispielsweise Diesel, zugeführt werden.  The piston-cylinder unit 3 can be supplied via the fuel injector 4 liquid fuel, such as diesel.
Die entsprechenden Medienleitungen für den flüssigen und den gasförmigen Kraftstoff sind der Übersichtlichkeit halber nicht gezeigt.  The corresponding media lines for the liquid and the gaseous fuel are not shown for clarity.
Der Kraftstoffinjektor 4 weist in diesem Ausführungsbeispiel genau eine Injektornadel 5 auf. Weiters ist im Kraftstoffinjektor 4 eine Kühleinrichtung 9 ausgebildet. Dies kann beispielsweise eine Flüssigkeitskühlung sein. Der Kraftstoffinjektor 4 weist weiters einen Nadelsensor 7 auf, durch welchen die Nadelposition der Injektornadel 5 an eine Regeleinrichtung 2 meldbar ist. Der Nadelsensor 7 kann beispielsweise als ein im Kraftstoffinjektor 4 angeordneter Drucksensor, als Wegmesseinrichtung oder als optischer Sensor ausgebildet sein.  The fuel injector 4 has exactly one injector needle 5 in this exemplary embodiment. Furthermore, a cooling device 9 is formed in the fuel injector 4. This can be for example a liquid cooling. The fuel injector 4 further has a needle sensor 7, by means of which the needle position of the injector needle 5 can be reported to a control device 2. The needle sensor 7 may be designed, for example, as a pressure sensor arranged in the fuel injector 4, as a displacement measuring device or as an optical sensor.
An der Kolben-Zylinder-Einheit 3 ist ein Verbrennungssensor 8 ausgebildet, von welchem für die Verbrennung charakteristische Signale an die Regeleinrichtung 2 meldbar sind. Der Verbrennungssensor 8 kann beispielsweise als Zylinderdrucksensor, Temperatursensor oder als optischer Sensor ausgebildet sein. Die Mengen des der Kolben-Zylinder-Einheit 3 über den Kraftstoffinjektor 4 zugeführten flüssigen Kraftstoffes bzw. die Mengen des über die Gaszufuhreinrichtung 6 zugeführten gasförmigen Kraftstoffs sind über die Regeleinrichtung 2 Steuer- bzw. regelbar. At the piston-cylinder unit 3, a combustion sensor 8 is formed, from which characteristic of the combustion signals to the control device. 2 are notifiable. The combustion sensor 8 may be designed, for example, as a cylinder pressure sensor, a temperature sensor or as an optical sensor. The quantities of the liquid fuel supplied to the piston-cylinder unit 3 via the fuel injector 4 or the quantities of the gaseous fuel supplied via the gas supply device 6 can be controlled via the control device 2.
Die Regeleinrichtung 2 kann in einer Motorsteuerung der Brennkraftmaschine 1 realisiert sein, oder getrennt von dieser ausgebildet sein.  The control device 2 can be realized in a motor control of the internal combustion engine 1, or be formed separately from this.
Das in Fig. 2 gezeigte Ausführungsbeispiel unterscheidet sich von jenem in Fig. 1 dadurch, dass hier die Gaszufuhreinrichtung 6 stromabwärts der Verdichtungseinrichtung 10 ausgebildet ist. Der gasförmige Kraftstoff wird hier also erst unmittelbar vor dem Einlassventil und stromabwärts der Verdichtungseinrichtung 10 zugeführt, welche in diesem Fall kein Gemisch, sondern Ladeluft verdichtet. Man spricht hier von einem luftaufgeladenen Konzept; die Gaszufuhreinrichtung 6 kann beispielsweise als port-injection (Pl)-Ventil ausgebildet sein. Ein solches Ventil eröffnet die Möglichkeit, die Gaszufuhr zylinderindividuell zu variieren. The embodiment shown in Fig. 2 differs from that in Fig. 1 in that here the gas supply means 6 is formed downstream of the compression device 10. The gaseous fuel is thus supplied here only immediately before the inlet valve and downstream of the compression device 10, which in this case does not compress a mixture, but charge air. This is called an air-charged concept; the gas supply device 6 may be formed, for example, as a port-injection (Pl) valve. Such a valve opens up the possibility of varying the gas supply cylinder-individually.
Fig. 3 zeigt ein vereinfachtes Regelschema zur Illustration des erfindungsgemäßen Verfahrens. Fig. 3 shows a simplified control scheme for illustrating the method according to the invention.
Als Kästen dargestellt sind die Gaszufuhreinrichtung 6, der Verbrennungssensor 8, der Kraftstoffinjektor 4 und der Nadelsensor 7 für eine Kolben-Zylinder-Einheit 3, die als Nummer 1 bezeichnet ist (es bestehen also mehrere Kolben-Zylinder-Einheiten 3). Die genannten Glieder Gaszufuhreinrichtung, Verbrennungssensor 8, Kraftstoffinjektor 4 und Nadelsensor 7 sind vorzugsweise in mehreren, besonders bevorzugt in allen Kolben-Zylinder-Einheiten 3 der Brennkraftmaschine 1 angelegt. Shown as boxes are the gas supply means 6, the combustion sensor 8, the fuel injector 4 and the needle sensor 7 for a piston-cylinder unit 3, which is designated as number 1 (there are therefore several piston-cylinder units 3). The mentioned elements gas supply device, combustion sensor 8, fuel injector 4 and needle sensor 7 are preferably applied in several, more preferably in all piston-cylinder units 3 of the internal combustion engine 1.
Die Regeleinrichtung 2 erkennt zunächst, ob die Brennkraftmaschine 1 im Dual-Fuel- Modus betrieben wird.  The control device 2 first detects whether the internal combustion engine 1 is operated in dual-fuel mode.
Der Übersichtlichkeit halber wird das Prinzip für eine einzige Kolben-Zylinder-Einheit 3 dargestellt. Über den Nadelsensor 7 werden Informationen über die Position der Injektornadel 5 des Kraftstoffinjektors 4 an die Regeleinrichtung 2 gemeldet. Diese Informationen können beispielsweise beinhalten, ob die Injektornadel 5 ihre jeweiligen Endlagen erreicht hat, wie lange sie in diesen Lagen oder zwischen den Endlagen positioniert war. Der Verbrennungssensor 8 liefert Informationen über die Verbrennung in der Kolben- Zylinder-Einheit 3. Diese Informationen können beispielsweise die Brenndauer, Zylinderdruck oder die Zylindertemperatur sein. In Abhängigkeit der vom Verbrennungssensor 8 und vom Nadelsensor 7 übermittelten Daten übergibt die Regeleinrichtung 2 Befehle an die Stellglieder, Gaszufuhreinrichtung 6 und Kraftstoffinjektor 4. An den Kraftstoffinjektor 4 übermittelte Daten können beispielsweise eine Bestromungsdauer (engl.: duration of current, DOC) bzw. Start einer Bestromung (engl.: Start of current, SOC) sein. Dies sind übliche Größen zur Bestimmung der Betätigungscharakteristik eines Kraftstoffinjektors 4. For the sake of clarity, the principle for a single piston-cylinder unit 3 is shown. Information about the position of the injector needle 5 of the fuel injector 4 is reported to the control device 2 via the needle sensor 7. This information may include, for example, whether the injector needle 5 has reached its respective end positions, how long it has been positioned in these positions or between the end positions. The combustion sensor 8 provides information about the combustion in the piston-cylinder unit 3. This information can be, for example, the burning time, cylinder pressure or the cylinder temperature. Depending on the data transmitted by the combustion sensor 8 and the needle sensor 7, the control device 2 transmits commands to the actuators, gas supply device 6 and fuel injector 4. Data transmitted to the fuel injector 4 can, for example, be a duration of current (DOC) or start an energization (English: Start of current, SOC) be. These are common parameters for determining the actuation characteristic of a fuel injector 4.
Durch das feedback vom Nadelsensor 7 kann nun die Regeleinrichtung 2 die an den Kraftstoffinjektor 4 übermittelten Werte (SOC, DOC) korrigieren (SOC_cor, DOC_cor), beispielsweise wenn eine Abweichung von tatsächlicher Öffnungsdauer des Kraftstoffinjektors 4 zu Soll-Öffnungsdauer festgestellt wurde. Due to the feedback from the needle sensor 7, the control device 2 can now correct the values (SOC, DOC) transmitted to the fuel injector 4 (SOC_cor, DOC_cor), for example if a deviation from the actual opening duration of the fuel injector 4 to the set opening duration has been detected.
Die Gaszufuhreinrichtung 6 kann von der Regeleinrichtung 2 Befehle zu Öffnungs- bzw. Schließzeitpunkten und Öffnungsdauer erhalten, wodurch sich die zugeführte Menge an gasförmigen Kraftstoff ergibt.  The gas supply device 6 can receive commands from the control device 2 at opening or closing times and opening duration, resulting in the supplied amount of gaseous fuel.
Weitere von der Regeleinrichtung 2 ansteuerbare Größen sind beispielsweise eine Verdichterumblasung oder ein waste-gate. Nicht instantan betätigbar, aber zur Kompensation von langsameren Änderungen geeignet, sind beispielsweise die Anpassung eines Drucks der Gaszufuhr oder des rail-Drucks des flüssigen Kraftstoffs. Während die Gaszufuhreinrichtung 6 und der Kraftstoffinjektor 4 zylinderindividuell ansteuerbar sind, betreffen die Stellglieder waste-gate, Verdichterumblasung {compressor-bypass), Versorgungsdruck des gasförmigen Kraftstoffes und rail-Druck (des flüssigen Kraftstoffes) alle Kolben-Zylinder-Einheiten 3, können also nicht zylinderindividuell variiert werden.  Other variables that can be controlled by the control device 2 are, for example, a compressor blower or a wastegate. Not instantaneously operable but capable of compensating for slower changes are, for example, adjusting a pressure of the gas supply or the rail pressure of the liquid fuel. While the gas supply device 6 and the fuel injector 4 are controlled individually for each cylinder, the actuators waste-gate, compressor-bypass, supply pressure of the gaseous fuel and rail pressure (of the liquid fuel) all concern piston-cylinder units 3, thus can not Can be varied individually for each cylinder.
Fig. 4 zeigt das Regelschema von Fig. 3 in einer alternativen Darstellungsform. Zunächst wird beim Start festgestellt, ob die Brennkraftmaschine 1 im Dual-Fuel-Modus oder im Dieselmodus betrieben wird. Im Dual-Fuel-Modus regelt die Regeleinrichtung 2 (hier ECU genannt) zylinderindividuell in Abhängigkeit der empfangenen Signale vom Verbrennungssensor 8 und vom Nadelsensor 7 die Betätigungscharakteristik des Kraftstoffinjektors 4 und/oder gegebenenfalls der Gaszufuhreinrichtung 6 für die Dosierung des gasförmigen Kraftstoffes. Eine zylinderindividuelle Variation der Menge an zugeführtem gasförmigen Kraftstoff kann beispielsweise durch ein port-injection-Ventil realisiert sein, wie es im Ausführungsbeispiel gemäß Fig. 2 erläutert wurde. Eine Alternative zur zylinderindividuellen Variation des zugeführten gasförmigen Kraftstoffes ist ein variabler Ventiltrieb. Fig. 4 shows the control scheme of Fig. 3 in an alternative form of representation. First, it is determined at startup, whether the internal combustion engine 1 is operated in dual-fuel mode or in diesel mode. In dual-fuel mode, the control device 2 (referred to here as ECU) controls the actuation characteristic of the fuel injector 4 and / or optionally the gas supply device 6 for metering the gaseous fuel as a function of the received signals from the combustion sensor 8 and the needle sensor 7. A cylinder-specific variation of the amount of supplied gaseous fuel can be realized for example by a port-injection valve, as it has been explained in the embodiment of FIG. An alternative to the cylinder-specific variation of the supplied gaseous fuel is a variable valve train.
Auf der linken Seite des Schemas ist die Verschaltung beispielhaft für zwei Kolben- Zylinder-Einheiten 3 (hier Zylinder 1 und 2 genannt) dargestellt. Die Glieder bzw. das Regelschema ist vorzugsweise für mehrere, besonders bevorzugt für alle Kolben- Zylinder-Einheiten 3 der Brennkraftmaschine 1 realisiert.  On the left side of the scheme, the interconnection is exemplified for two piston-cylinder units 3 (here called cylinders 1 and 2). The members or the control scheme is preferably realized for several, more preferably for all piston-cylinder units 3 of the internal combustion engine 1.
Die funktionale Einheit aus Kraftstoffinjektor 4 und Nadelsensor 7 empfängt von der Regeleinrichtung 2 (ECU) einerseits das feedback vom Nadelsensor 7 über die tatsächliche Betätigungscharakteristik des Kraftstoffinjektors 4, d.h. Öffnungsdauer, Öffnungs- und Schließzeitzeitpunkte. Zum anderen erhält die funktionale Einheit aus Kraftstoffinjektor 4 und Nadelsensor 7 Befehle zur Betätigung des Kraftstoffinjektors 4, wie Start einer Bestromung (engl.: Start of current, SOC) und eine Bestromungsdauer (engl.: duration of current, DOC). Aus dem feedback des Nadelsensors 7 berechnet und übermittelt die Regeleinrichtung 2 bei Bedarf korrigierte Werte SOC_cor und DOC_cor. The functional unit of fuel injector 4 and needle sensor 7 receives from the controller 2 (ECU) on the one hand the feedback from the needle sensor 7 on the actual operating characteristic of the fuel injector 4, i. Opening time, opening and closing times. On the other hand, the functional unit of fuel injector 4 and needle sensor 7 receives commands for actuating the fuel injector 4, such as start of current (SOC) and a duration of current (DOC). From the feedback of the needle sensor 7, the controller 2 calculates and transmits, if necessary, corrected values SOC_cor and DOC_cor.
Auf der rechten Seite des Schemas sind Stellgrößen angegeben, welche nicht zylinderindividuell wirken, sondern alle Kolben-Zylinder-Einheiten 3 der Brennkraftmaschine 1 betreffen. On the right side of the scheme manipulated variables are specified, which do not act cylinder-specific, but all piston-cylinder units 3 of the internal combustion engine 1 relate.
Liste der verwendeten Bezugszeichen: List of reference numbers used:
1 Brennkraftmaschine1 internal combustion engine
2 Regeleinrichtung2 control device
3 Kolben-Zylinder-Einheit3 piston-cylinder unit
4 Kraftstoffinjektor4 fuel injector
5 Injektornadel 5 injector needle
6 Gaszufuhreinrichtung 6 gas supply device
7 Nadelsensor 7 needle sensor
8 Verbrennungssensor 8 combustion sensor
9 Kühleinrichtung 9 cooling device
10 Verdichtungseinrichtung 10 compacting device
1 1 Abgasturbine 1 1 exhaust gas turbine

Claims

Patentansprüche Dual-Fuel-Brennkraftmaschine (1 ) mit: Claims Dual-fuel internal combustion engine (1) with:
- einer Regeleinrichtung (2) zum Regeln der Brennkraftmaschine  - A control device (2) for controlling the internal combustion engine
- wenigstens zwei Kolben-Zylinder-Einheiten (3)  at least two piston-cylinder units (3)
- wobei jedem der wenigstens zwei Kolben-Zylinder-Einheiten (3) ein Kraftstoffinjektor (4) für einen flüssigen Kraftstoff zugeordnet ist, welcher eine Injektornadel (5) aufweist, die verschiedene Nadelpositionen einnehmen kann - wherein each of the at least two piston-cylinder units (3) is associated with a fuel injector (4) for a liquid fuel, which has an injector needle (5), which can assume different needle positions
- wobei jedem der wenigstens zwei Kolben-Zylinder-Einheiten (3) eine Gaszufuhreinrichtung (6) für gasförmigen Kraftstoff zugeordnet ist, - Wherein each of the at least two piston-cylinder units (3) is associated with a gas supply means (6) for gaseous fuel,
- wobei die Regeleinrichtung (2) dazu ausgebildet ist, den Kraftstoffinjektor (4) und die wenigstens eine Gaszufuhreinrichtung (6) individuell zur wahlweisen Dosierung der Menge an jedem der wenigstens zwei Kolben-Zylinder-Einheiten (3) zugeführten flüssigen bzw. gasförmigen Kraftstoff anzusteuern,  - wherein the control device (2) is adapted to control the fuel injector (4) and the at least one gas supply means (6) individually for selectively metering the amount of each of the at least two piston-cylinder units (3) supplied liquid or gaseous fuel .
dadurch gekennzeichnet, dass  characterized in that
für jeden der wenigstens zwei Kolben-Zylinder-Einheiten (3), wenigstens ein mit der Regeleinrichtung (2) verbundener und der jeweiligen Kolben-Zylinder-Einheit (3) zugeordneter Nadelsensor (7) vorgesehen ist, durch welchen ein für die Nadelposition im ballistischen Bereich charakteristisches Signal erfassbar ist sodass der Kraftstoffinjektor (4), zur Regelung der zugeführten Kraftstoffmenge im ballistischen Bereich individuell für jeden der wenigstens zwei Kolben- Zylinder-Einheiten (3), kontrollierbar betreibbar ist. for each of the at least two piston-cylinder units (3), at least one associated with the control device (2) and the respective piston-cylinder unit (3) associated needle sensor (7) is provided, by which one for the needle position in the ballistic Area characteristic signal can be detected so that the fuel injector (4), for controlling the amount of fuel supplied in the ballistic range individually for each of the at least two piston-cylinder units (3), controllably operable.
2. Brennkraftmaschine nach Anspruch 1 , wobei für jeden der wenigstens zwei Kolben-Zylinder-Einheiten (3) wenigstens ein mit der Regeleinrichtung (2) verbundener und der jeweiligen Kolben-Zylinder-Einheit (3) zugeordneter Verbrennungssensor (8) vorgesehen ist, durch welchen ein für die jeweilige Kolben-Zylinder-Einheit (3) erfolgende Verbrennung charakteristisches Signal erfassbar ist. 2. Internal combustion engine according to claim 1, wherein for each of the at least two piston-cylinder units (3) at least one connected to the control device (2) and the respective piston-cylinder unit (3) associated combustion sensor (8) is provided by which a characteristic of the respective piston-cylinder unit (3) combustion characteristic signal can be detected.
3. Brennkraftmaschine nach Anspruch 2, wobei die Regeleinrichtung (2) dazu ausgebildet ist, die Mengen des den wenigstens zwei Kolben-Zylinder-Einheiten (3) zugeführten flüssigen bzw. gasförmigen Kraftstoffes abhängig von dem für die jeweilige Nadelposition und von dem für die jeweilige Verbrennung charakteristischen Signal individuell zu regeln. 3. Internal combustion engine according to claim 2, wherein the control device (2) is adapted to the amounts of the at least two piston-cylinder units (3) supplied liquid or gaseous fuel depending on the respective needle position and of the respective Individually regulate combustion characteristic signal.
4. Brennkraftmaschine nach Anspruch 2 oder 3, wobei der Nadelsensor (7) und der Verbrennungssensor (8) gesondert voneinander ausgebildet sind. 4. Internal combustion engine according to claim 2 or 3, wherein the needle sensor (7) and the combustion sensor (8) are formed separately from each other.
5. Brennkraftmaschine nach Anspruch 2 oder 3, wobei der Nadelsensor (7) und der Verbrennungssensor (8) als ein- und derselbe Sensor ausgebildet sind. 5. Internal combustion engine according to claim 2 or 3, wherein the needle sensor (7) and the combustion sensor (8) are designed as one and the same sensor.
6. Brennkraftmaschine nach wenigstens einem der vorherigen Ansprüche, wobei pro Kolben-Zylinder-Einheit (3) genau ein Kraftstoffinjektor (4) für flüssigen Kraftstoff vorgesehen ist, der vorzugsweise genau eine Injektornadel (5) aufweist. 6. Internal combustion engine according to at least one of the preceding claims, wherein per piston-cylinder unit (3) exactly one fuel injector (4) is provided for liquid fuel, which preferably has exactly one Injektornadel (5).
7. Brennkraftmaschine nach wenigstens einem der vorherigen Ansprüche, wobei die Regeleinrichtung (2) dazu ausgebildet ist, die Menge des den wenigstens zwei Kolben-Zylinder-Einheiten (3) zugeführten flüssigen Kraftstoffes in einem Bereich von 0,5 % bis 100 % individuell zu variieren und entsprechend die Menge des den wenigstens zwei Kolben-Zylinder-Einheiten (3) zugeführten gasförmigen Kraftstoffes in einem Bereich von 99,5 % bis 0 % zu variieren. 7. Internal combustion engine according to at least one of the preceding claims, wherein the control device (2) is adapted to the amount of the at least two piston-cylinder units (3) supplied liquid fuel in a range of 0.5% to 100% individually vary and, accordingly, to vary the amount of gaseous fuel supplied to the at least two piston-cylinder units (3) in a range of 99.5% to 0%.
8. Brennkraftmaschine nach Anspruch 7, wobei die Regeleinrichtung (2) dazu ausgebildet ist, die Menge des den wenigstens zwei Kolben-Zylinder-Einheiten (3) zugeführten gasförmigen Kraftstoffes und die Menge des den der wenigstens zwei Kolben-Zylinder-Einheiten (3) zugeführten flüssigen Kraftstoffes in Abhängigkeit eines hinterlegten oder berechneten Profils individuell zu regeln, wobei das Profil einen Zusammenhang zwischen verschiedenen Betriebszuständen der Brennkraftmaschine (1 ) und dazugehörigen Mengen an gasförmigem und flüssigem Kraftstoff definiert. 8. Internal combustion engine according to claim 7, wherein the control device (2) is adapted to the amount of the at least two piston-cylinder units (3) supplied gaseous fuel and the amount of the at least two liquid-fuel supplied to piston-cylinder units (3) as a function of a stored or calculated profile, wherein the profile defines a relationship between different operating states of the internal combustion engine (1) and associated amounts of gaseous and liquid fuel.
9. Brennkraftmaschine nach wenigstens einem der vorherigen Ansprüche, wobei der Nadelsensor (7) als ein im Kraftstoffinjektor (4) angeordneter Drucksensor, als Wegmesseinrichtung oder als optischer Sensor ausgebildet ist. 9. Internal combustion engine according to at least one of the preceding claims, wherein the needle sensor (7) is designed as a in the fuel injector (4) arranged pressure sensor, as a path measuring device or as an optical sensor.
10. Brennkraftmaschine nach wenigstens einem der vorherigen Ansprüche, wobei der Verbrennungssensor (8) ein Klopfsensor, ein Zylinderdrucksensor, ein Temperatursensor oder eine NOx-Sonde ist. 10. Internal combustion engine according to at least one of the preceding claims, wherein the combustion sensor (8) is a knock sensor, a cylinder pressure sensor, a temperature sensor or a NOx sensor.
1 1 . Brennkraftmaschine nach wenigstens einem der vorherigen Ansprüche, wobei eine Kühleinrichtung (9) für den Kraftstoffinjektor (4) vorgesehen ist. 1 1. Internal combustion engine according to at least one of the preceding claims, wherein a cooling device (9) for the fuel injector (4) is provided.
12. Brennkraftmaschine nach wenigstens einem der vorherigen Ansprüche, wobei die Regeleinrichtung (2) dazu ausgebildet ist, anhand des für die Nadelposition charakteristischen Signales des Nadelsensors (7) eine Verschleißcharakteristik des Nadelsensors (7) festzustellen. 12. Internal combustion engine according to at least one of the preceding claims, wherein the control device (2) is adapted to determine a wear characteristic of the needle sensor (7) based on the characteristic of the needle position signal of the needle sensor (7).
13. Verfahren zum Betreiben einer Dual-Fuel-Brennkraftmaschine, insbesondere nach einem der Ansprüche 1 bis 12, wobei die Menge des den wenigstens zwei Kolben-Zylinder-Einheiten (3) zugeführten gasförmigen Kraftstoffes und die13. A method for operating a dual-fuel internal combustion engine, in particular according to one of claims 1 to 12, wherein the amount of the at least two piston-cylinder units (3) supplied gaseous fuel and the
Menge des den wenigstens zwei Kolben-Zylinder-Einheiten (3) zugeführten flüssigen Kraftstoffes in Abhängigkeit einer Position einer Injektornadel (5) eines Kraftstoffinjektors (4) der jeweiligen Kolben-Zylinder-Einheit (3) für den flüssigen Kraftstoff und in Abhängigkeit von einer in der wenigstens zwei Kolben-Zylinder- Einheiten (3) stattfindenden Verbrennung individuell geregelt wird. Amount of the liquid fuel supplied to the at least two piston-cylinder units (3) in response to a position of an injector needle (5) of a fuel injector (4) of the respective liquid fuel piston-cylinder unit (3) and in dependence on a the at least two piston-cylinder units (3) occurring combustion is controlled individually.
14. Verfahren nach Anspruch 13, wobei die Menge des den wenigstens zwei Kolben- Zylinder-Einheiten (3) zugeführten flüssigen Kraftstoffes in einem Bereich von 0,5 % bis 100 % individuell variiert wird und entsprechend die Menge des den wenigstens zwei Kolben-Zylinder-Einheiten (3) zugeführten gasförmigen Kraftstoffes in einem Bereich von 99,5 % bis 0 % variiert wird. 14. The method of claim 13, wherein the amount of the at least two piston-cylinder units (3) supplied liquid fuel is varied individually in a range of 0.5% to 100% and, accordingly, the amount of the At least two piston-cylinder units (3) supplied gaseous fuel in a range of 99.5% to 0% is varied.
15. Verfahren nach Anspruch 13 oder 14, wobei die Menge an gasförmigem Kraftstoff und die Menge an flüssigem Kraftstoff welche den wenigstens zwei Kolben-Zylinder-Einheiten (3) zugeführt wird, individuell in Abhängigkeit eines hinterlegten oder berechneten Profils geregelt wird, wobei das Profil einen Zusammenhang zwischen verschiedenen Betriebszuständen der Brennkraftmaschine (1 ) und dazugehörigen Mengen an gasförmigem und flüssigem Kraftstoff definiert. 15. The method of claim 13 or 14, wherein the amount of gaseous fuel and the amount of liquid fuel which is supplied to the at least two piston-cylinder units (3) is controlled individually as a function of a stored or calculated profile, wherein the profile defines a relationship between different operating states of the internal combustion engine (1) and associated amounts of gaseous and liquid fuel.
EP16722773.5A 2015-04-21 2016-04-20 Dual-fuel internal combustion engine Withdrawn EP3286421A1 (en)

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