EP3371441A1 - Internal combustion engine with injection quantity control - Google Patents
Internal combustion engine with injection quantity controlInfo
- Publication number
- EP3371441A1 EP3371441A1 EP16798619.9A EP16798619A EP3371441A1 EP 3371441 A1 EP3371441 A1 EP 3371441A1 EP 16798619 A EP16798619 A EP 16798619A EP 3371441 A1 EP3371441 A1 EP 3371441A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injector
- internal combustion
- combustion engine
- liquid fuel
- fuel
- 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- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 79
- 238000002347 injection Methods 0.000 title claims description 27
- 239000007924 injection Substances 0.000 title claims description 27
- 239000000446 fuel Substances 0.000 claims abstract description 98
- 239000007788 liquid Substances 0.000 claims abstract description 71
- 238000000034 method Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims 1
- 230000009977 dual effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 abstract 3
- 238000006467 substitution reaction Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 4
- 238000007906 compression Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000010763 heavy fuel oil Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- 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
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- 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
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- 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
- F02D19/0631—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position by estimation, i.e. without using direct measurements of a corresponding sensor
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
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- 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
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- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
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- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D41/1402—Adaptive control
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- 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
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- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2464—Characteristics of actuators
- F02D41/2467—Characteristics of actuators for injectors
- F02D41/247—Behaviour for small quantities
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- 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
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
- F02D41/3035—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the premixed charge compression-ignition mode
- F02D41/3041—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the premixed charge compression-ignition mode with means for triggering compression ignition, e.g. spark plug
- F02D41/3047—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the premixed charge compression-ignition mode with means for triggering compression ignition, e.g. spark plug said means being a secondary injection of fuel
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- 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
- F02M43/04—Injectors peculiar thereto
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- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1413—Controller structures or design
- F02D2041/1415—Controller structures or design using a state feedback or a state space representation
- F02D2041/1416—Observer
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- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1413—Controller structures or design
- F02D2041/143—Controller structures or design the control loop including a non-linear model or compensator
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- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
- F02D2041/1434—Inverse model
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- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
- F02D2041/286—Interface circuits comprising means for signal processing
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- 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
- F02D2200/0602—Fuel pressure
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- 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
- F02D2200/0611—Fuel type, fuel composition or fuel quality
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- 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
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- 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
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- 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
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- 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
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- 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
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a dual-fuel internal combustion engine with the features of the preamble of claim 1 and a method having the features of the preamble of claim 12 and 13, respectively.
- 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 a liquid fuel) and a mode of operation with primary gaseous fuel supply in which the liquid fuel serves as a pilot fuel for initiating combustion ( “Gas operation”, also referred to as “pilot operation” or “pilot jet operation”.)
- liquid fuel for short, “diesel operation” in the case of using diesel as a liquid fuel
- pilot operation also referred to as "pilot operation” or “pilot jet operation”.
- the liquid fuel is called diesel.It could also be heavy fuel oil or another auto-ignitable fuel.
- the gaseous fuel is called natural gas there are other gaseous fuels like biogas etc.
- a small amount of liquid fuel is introduced as a so-called pilot injection in a piston-cylinder unit.
- the introduced liquid fuel ignites and ignites a mixture of gaseous fuel and air present in a combustion space of the piston-cylinder unit.
- the amount of liquid fuel of a pilot injection is typically 0.5-5% of the total amount of energy supplied to the piston-cylinder unit in one operating cycle of the internal combustion engine.
- the internal combustion engine is operated either in pilot operation or in diesel operation.
- the pilot mode of the internal combustion engine is referred to as a pilot mode
- a liquid mode of the internal combustion engine is referred to as a liquid mode with respect to the controller.
- 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.
- the substitution rate indicates what proportion of the energy supplied to the internal combustion engine is supplied in the form of the gaseous fuel.
- the aim is substitution rates between 98 and 99.5%.
- Such high substitution rates require a design of the internal combustion engine, for example, in terms of the compression ratio as it corresponds to that of a gas engine.
- the partially conflicting requirements for the internal combustion engine for a pilot operation and a liquid operation lead to compromises in the design, for example with regard to the compression ratio.
- a problem in the prior art is that over the life of an injector an exact control of the injected amount of liquid fuel for very small amounts (high substitution rates) using a single injector with only one needle is not possible, since this is at very small amounts in the ballistic range , In this area, due to statistical variations, manufacturing variability, wear, etc., the actuation of the needle-opening actuator does not unambiguously map to the mass of liquid fuel injected.
- WO 2014/202202 A1 describes an injector for a generic internal combustion engine, in which by means of a pressure sensor arranged in the injector the pressure drop in a storage chamber is measured and from this the actual injection duration is determined. For very small amounts, however, the pressure drop is too low to produce a sufficiently accurate correlation with the duration of injection.
- the object of the invention is to provide a dual-fuel internal combustion engine and a method in which an exact control of the injected amount of liquid fuel is possible even with very small quantities.
- an algorithm is stored, which receives at least the Aktuatoran Kunststoffsignal as inputs and calculated via an injector model on the discharge opening of the injector mass of liquid fuel and calculated by the injector model mass with a desired setpoint mass of liquid fuel Comparing and depending on the result of the comparison leaves the Aktuatoran Kunststoffsignal same or corrected, it is possible to exactly regulate even small amounts of liquid fuel using only one injector with only one needle, the substitution rate does not have to be limited upwards.
- the same single-needle injector may be operated in a range of 0% substitution rate up to a selected upper limit (eg, 99.5%) of the substitution rate. It is therefore possible with the same injector operation in liquid mode, in pilot mode or in mixed mode.
- the algorithm estimates a mass of injected liquid fuel based on the actuator drive signal.
- the invention then starts from the mass of injected fuel calculated by the algorithm and compares this value to the desired set point. In case of deviations can be corrected immediately (eg within 10 milliseconds).
- the volume or other quantities characteristic of a given mass of liquid fuel injected could also be calculated. All of these possibilities are included in the present disclosure using the term "mass”.
- at least one sensor is provided by which at least one measured variable of the at least one injector can be measured, wherein the sensor is in signal connection with the control device or can be brought.
- the algorithm can calculate, via the injector model, the mass of liquid fuel discharged via the discharge opening of the injector.
- the algorithm has a precontrol which calculates from the desired desired value of the mass of liquid fuel a pilot command (also referred to as "pilot control signal") for the actuator drive signal for the injection duration
- a pilot command also referred to as "pilot control signal”
- the precontrol uses an injector map (which, for example, indicates the energization duration via the injection mass or volume in an actuator designed as a solenoid valve) or an inverted injector model around the target value of the injector To convert to be injected mass of liquid fuel in the pilot command for the injection duration.
- the algorithm has a feedback loop which, taking into account the pilot control command for the injection duration and the at least one measured variable by means of the injector model, injects the mass of liquid injected via the discharge opening of the injector Calculated fuel and if necessary (in the presence of a deviation) corrected by the pilot control calculated setpoint for the injection duration.
- the feedback loop is used to correct the inaccuracies of feedforward (due to manufacturing variability, wear, etc.) causing injector drift.
- the algorithm preferably has an observer, who, using the injector model, injects the injected mass of liquid fuel as a function of the at least one measured variable and the at least one actuator drive signal estimates.
- An actual measurement of the injected mass of liquid fuel is therefore not required for the feedback loop.
- the estimated mass of liquid fuel estimated by the observer may be used in the feedforward control to enhance the actuator drive signal.
- the observer can also serve to take into account, with the aid of the injector model, the state of the injector that changes over the life of the injector (eg due to aging or wear) for improving the pilot signal and / or the actuator drive signal.
- the control is therefore not constructed in two parts, with a feedforward control and a feedback control loop which corrects the precontrol signal.
- the injector model at least includes:
- the injector may have at least:
- the needle is usually biased against the opening direction by a spring.
- an injector which manages without control chamber, for example an injector, in which the needle is driven by a piezoelectric element.
- the at least one measured variable can, for. B. selected from the following sizes or a combination thereof:
- the controller may be configured to execute the algorithm during each combustion cycle or selected combustion cycles of the internal combustion engine and, in the event of deviations, to correct the actuator drive signal during that combustion cycle.
- the controller may be configured to process the algorithm during each combustion cycle or selected combustion cycles Run internal combustion engine and in case of deviations to correct the Aktuatoran Kunststoffsignal in one of the subsequent combustion cycles, preferably in the immediately following combustion cycle.
- the control device may be designed to execute the algorithm during each combustion cycle or selected combustion cycles of the internal combustion engine and to statically evaluate the deviations that have occurred and to carry out a correction for this or one of the subsequent combustion cycles as a function of the static evaluation.
- the invention can preferably be used in a stationary internal combustion engine, for marine applications or mobile applications, such as so-called “non-road mobile machinery” (NRMM), preferably in each case as a reciprocating piston engine
- NRMM non-road mobile machinery
- the internal combustion engine preferably has a multiplicity of combustion chambers with corresponding gas supply devices and injectors The regulation can be carried out individually for each combustion chamber.
- Fig. 1 shows a first embodiment of the invention
- Fig. 2 shows a second embodiment of the invention
- FIG. 3 shows a first example of a schematically illustrated injector
- FIG. 4 shows a second example of a schematically illustrated injector It should be noted that in none of the figures, the gas supply device for supplying the gaseous fuel to the at least one combustion chamber are shown apart from the valves shown schematically or the corresponding control or regulation. These correspond to the prior art.
- the aim of the injector control is in this embodiment, the regulation of the actually injected mass of liquid fuel to a target value, by controlling the injection duration ⁇ t.
- the rule strategy is done by
- a feedforward control (FF), which from a desired setpoint d for the mass of liquid fuel, a pilot signal .DELTA.t ff (hereinafter also referred to as "control command") calculated for the injection duration .DELTA.t and
- FB feedback loop
- Control command for the injection duration .DELTA.t and at least one measured variable y eg one of the pressure profiles occurring in the injector or the beginning of the
- the pilot control ensures a fast system response since it drives the injector with an injection duration ⁇ t as if there were no injector variability.
- the feedforward control using a calibrated Injektorkennfeld (which energization duration via injection mass or volume indicating) or the inverted Injektormodell around the desired value of the mass of liquid fuel in the pilot command .DELTA.t ff for
- the feedback loop (FB) is used to correct the inaccuracies of feedforward (due to manufacturing variability, wear, etc.) causing injector drift.
- the feedback loop compares the Setpoint with the estimated injected mass of liquid fuel
- the observer estimates the injected mass of liquid fuel in
- the at least one measured variable y can be z. B. refer to: common rail pressure p CR , pressure in the input storage chamber pressure in the
- the observer uses a reduced injector model around the injected mass estimate liquid fuel.
- This figure shows a one-part (without pilot command .DELTA.t ff ) constructed control in which the Aktuatoran Kunststoffsignal .DELTA.t based on the setpoint
- the control is therefore not constructed in two parts, with a feedforward control and a feedback control loop which corrects the precontrol signal.
- the injector model consists of a structural model of the injector and a system of equations describing the dynamic behavior of the structural model.
- the structural model consists of five modeled volumes: the Intake Accumulator, the Accumulator Chamber, the Control Chamber, the Small Accumulator Chamber, and the Junction.
- the input storage chamber 1 represents the summary of all volumes between the input throttle and the check valve.
- the storage chamber 3 represents the The volume across the needle seat represents the summary of all volumes between the needle seat to the discharge opening of the injector.
- the connection volume 5 represents the summary of all volumes, the volumes of the storage chamber 3 and the Control chamber 2 connects to the solenoid valve.
- FIG. 4 shows an alternatively designed injector which does not require a control chamber 2, for example an injector, in which the needle is actuated by a piezo element.
- the time evolution of the pressure within each of the volumes is calculated based on a combination of the mass conservation rate and the pressure-density characteristic of the liquid fuel.
- the temporal evolution of the pressure results from:
- the needle position is calculated using the following equation of motion:
- the solenoid valve is modeled by a first order transfer function that converts the valve opening command to a valve position. This is given by:
- a solenoid valve also allows piezoelectric actuation. Mass flow rates
- Control chamber 2 in kg / s
- the so-called observer equations preferably using a per se known observer of the "sliding mode observer" type, by adding to the equations of the injector model the so-called observer law
- a "sliding mode" observer one obtains the observer law by calculating a hypersurface from the at least one measurement signal and the value resulting from the observer equations by squaring the hypersurface equation to obtain a generalized Ljapunov equation (generalized The observer law is that function which minimizes the functional equation, which can be determined by the well-known variation techniques or numerically, which is done within a combustion cycle for each time step (depending on the time resolution of the regulation).
- the result is the estimated injected mass of liquid fuel, the position of the needle 6, or one of the pressures in one of the volumes of the injector.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15192916.3A EP3165746A1 (en) | 2015-11-04 | 2015-11-04 | Internal combustion engine with injection amount control |
PCT/AT2016/060101 WO2017075644A1 (en) | 2015-11-04 | 2016-11-03 | Internal combustion engine with injection quantity control |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3371441A1 true EP3371441A1 (en) | 2018-09-12 |
Family
ID=54366117
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15192916.3A Withdrawn EP3165746A1 (en) | 2015-11-04 | 2015-11-04 | Internal combustion engine with injection amount control |
EP16798619.9A Withdrawn EP3371441A1 (en) | 2015-11-04 | 2016-11-03 | Internal combustion engine with injection quantity control |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15192916.3A Withdrawn EP3165746A1 (en) | 2015-11-04 | 2015-11-04 | Internal combustion engine with injection amount control |
Country Status (4)
Country | Link |
---|---|
US (1) | US20190078530A1 (en) |
EP (2) | EP3165746A1 (en) |
DE (1) | DE112016005045A5 (en) |
WO (1) | WO2017075644A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017191170A1 (en) * | 2016-05-03 | 2017-11-09 | Continental Automotive Gmbh | Method for operating a fuel injector with an idle stroke |
DE102018115305B3 (en) * | 2018-06-26 | 2019-10-24 | Mtu Friedrichshafen Gmbh | Method for adjusting an injection behavior of injectors of an internal combustion engine, engine control unit and internal combustion engine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6557530B1 (en) * | 2000-05-04 | 2003-05-06 | Cummins, Inc. | Fuel control system including adaptive injected fuel quantity estimation |
US6912992B2 (en) * | 2000-12-26 | 2005-07-05 | Cummins Westport Inc. | Method and apparatus for pilot fuel introduction and controlling combustion in gaseous-fuelled internal combustion engine |
DE102012109655B4 (en) * | 2012-10-10 | 2019-12-12 | Denso Corporation | Method for determining a fuel injection rate |
EP2725215A1 (en) * | 2012-10-23 | 2014-04-30 | Delphi International Operations Luxembourg S.à r.l. | Method of operating an internal combustion engine |
DE102013211731B4 (en) | 2013-06-20 | 2024-06-13 | Rolls-Royce Solutions GmbH | Method for correcting the injection duration of injectors of an internal combustion engine and control device |
US10100773B2 (en) * | 2014-06-04 | 2018-10-16 | Ford Global Technologies, Llc | Method and system for dual fuel engine system |
-
2015
- 2015-11-04 EP EP15192916.3A patent/EP3165746A1/en not_active Withdrawn
-
2016
- 2016-11-03 DE DE112016005045.3T patent/DE112016005045A5/en not_active Withdrawn
- 2016-11-03 WO PCT/AT2016/060101 patent/WO2017075644A1/en active Application Filing
- 2016-11-03 EP EP16798619.9A patent/EP3371441A1/en not_active Withdrawn
- 2016-11-03 US US16/064,535 patent/US20190078530A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
US20190078530A1 (en) | 2019-03-14 |
EP3165746A1 (en) | 2017-05-10 |
WO2017075644A1 (en) | 2017-05-11 |
DE112016005045A5 (en) | 2018-08-09 |
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