WO2014175819A1 - Method and system for control of an internal combustion engine - Google Patents
Method and system for control of an internal combustion engine Download PDFInfo
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- WO2014175819A1 WO2014175819A1 PCT/SE2014/050493 SE2014050493W WO2014175819A1 WO 2014175819 A1 WO2014175819 A1 WO 2014175819A1 SE 2014050493 W SE2014050493 W SE 2014050493W WO 2014175819 A1 WO2014175819 A1 WO 2014175819A1
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- Prior art keywords
- combustion
- during
- control
- fuel
- combustion cycle
- Prior art date
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 461
- 238000000034 method Methods 0.000 title claims abstract description 83
- 239000000446 fuel Substances 0.000 claims abstract description 100
- 238000002347 injection Methods 0.000 claims description 224
- 239000007924 injection Substances 0.000 claims description 224
- 230000008859 change Effects 0.000 claims description 22
- 238000004590 computer program Methods 0.000 claims description 13
- 238000009826 distribution Methods 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims 1
- 238000004364 calculation method Methods 0.000 description 32
- 239000000126 substance Substances 0.000 description 18
- 230000002853 ongoing effect Effects 0.000 description 15
- 230000006870 function Effects 0.000 description 14
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 14
- 238000011161 development Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000000567 combustion gas Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000012913 prioritisation Methods 0.000 description 1
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- 230000004044 response Effects 0.000 description 1
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- 229910001868 water Inorganic materials 0.000 description 1
- 238000005303 weighing Methods 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
- 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
- F02D35/026—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 using an estimation
-
- 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
- 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
- F02D41/402—Multiple injections
-
- 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
- F02D2041/1412—Introducing closed-loop corrections characterised by the control or regulation method using a predictive controller
-
- 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
-
- 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
- F02D41/3809—Common rail control systems
- F02D41/3827—Common rail control systems for diesel engines
-
- 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 pertains to combustion engines, and in particular to a method for the control of a combustion engine according to the preamble of claim 1.
- the invention also relates to a system and a vehicle, as well as a computer program and a computer program product, which implement the method according to the invention.
- Emission regulations often consist of sets of requirements defining acceptable limits for exhaust emissions in vehicles equipped with combustion engines. For example, levels of nitrogen oxides (NO x ) , hydrocarbons (HC) and carbon monoxide (CO) are often regulated. These emission regulations may also e.g. handle the occurrence of particles in exhaust emissions.
- NO x nitrogen oxides
- HC hydrocarbons
- CO carbon monoxide
- the treatment of exhausts may also comprise other- components , e.g. particulate filters.
- the occurrence of unwanted compounds in the exhaust flow resulting from, the combustion engine is to a large extent caused by the combustion process in the combustion engine's combustion chamber, at least partly depending on the amount of fuel consumed in the combustion. For this reason, and due to a very large part of the operating economy of primarily heavy- goods vehicles being controlled, as set out above, by the amount of fuel consumed, great efforts are also made to make the combustion engine's combustion more efficient in an effort to reduce emissions and fuel consumption,
- One objective of the present invention is to provide a method to control a combustion engine. This objective is achieved with a method according to claim 1.
- the present invention pertains to a method for the control of a. combustion engine, where said combustion engine comprises at least one combustion chamber and elements for the supply of fuel to said combustion chamber, wherein the combustion in said combustion chamber occurs in combustion cycles.
- a first parameter value is determined which represents a physical quantity in connection with combustion in said combustion chamber
- the combustion is controlled during- a subsequent part of said first combustion cycle, where during said control of the combustion during said subsequent part of said first combustion cycle, the combustion is controlled with respect to a representation of a heat loss resulting during said combustion.
- the efficiency of the combustion engine has a great impact on a vehicle's total economy, in particular with respect to heavy goods vehicles. For this reason, it is often desirable that the combustion is controlled in a manner that entails as efficient a combustion as possible.
- the regulation of the combustion may be arranged to be carried out individually for each cylinder, and it is also possible to control a combustion during a subsequent combustion cycle, based on information from one or several previous combustion processes .
- the present invention pertains to a control of the combustion process where circumstances during the course of an ongoing combustion cycle may be determined, where control may be carried out during an ongoing combustion with the objective of controlling the combustion toward a desired result.
- combustion engine's output shaft i.e. the force which may be used to drive the vehicle.
- a part of the combustion's energy will be used to neat the exhausts resulting from combustion, and a part of the energy released during the combustion will be lost in pure heat losses, i.e. to heat the combustion engine.
- the arising heating of the combustion engine must be taken care of by the vehicle's cooling system, with the associated, load on the latter. Also, the available heat, energy in the combustion's exhausts is reduced, heat energy which may often be desirable, e.g. for heating of exhaust treatment components such as catalysts, particulate filters, etc.
- combustion is therefore controlled with respect to the heat loss which arises during combustion, i.e. the energy which is not used, for work or heating of exhausts, a d the control may e.g. be controlled toward a minimisation of the resulting heat loss arising during the combustion.
- Control may be achieved by, during a first part of a combustion cycle, determining a parameter value relating to a physical quantity for the combustion, e.g. a pressure prevailing in the combustion chamber .
- the combustion may then during a subsequent part of the combustion cycle be controlled with respect to the heat loss which arises.
- the combustion may e.g. be controlled by determining an injection strategy for application at. a subsequent
- injection where, at the determination of the injection strategy the resulting heat loss may be predicted by way of estimation, so that an injection strategy, e.g. one injection strategy out of several injection strategies, may be selected based on an estimated heat loss for the respective injection strategy .
- a control parameter for the control of the combustion during said subsequent part of said combustion cycle may be determined, where, at said determination - with the use of said first parameter value - an expected heat loss may be predicted with an estimation for at least two control alternatives for said subsequent part of said combustion cycle, where the control alternative which is deemed to be most suitable may be used for the control of the subsequent combustion .
- the combustion may thus, during the subsequent part of said first combustion cycle, be
- control may e.g. be arranged to be regulated toward a desired heat loss for said first combustion cycle .
- control may be arranged to determine a desired heat loss for said subsequent part of said combustion cycle, based on the -work to be achieved during said first combustion cycle, so that the combustion may be controlled during said
- Said first parameter value may be arranged to be determined when a part of said first combustion cycle has lapsed, and e.g. when combustion of fuel has been started during said first combustion cycle.
- said first parameter value allows for a good estimation, since estimation is carried out with starting- values consisting of actually prevailing
- said first parameter value is determined when the combustion has been initiated in said first combustion chamber, so that the regulation of the combustion during the subsequent part of said first combustion cycle may be carried out based on prevailing circumstances in the combustion chamber, after the combustion of fuel has been initiated.
- the method according to the present invention may e.g. be implemented with the help of one or several FPGA (Field- Programmable Gate Array) circuits, and/or one or several ASIC (application-specific integrated circuit) circuits, or other types of circuits which may handle the desired calculation speed .
- FPGA Field- Programmable Gate Array
- ASIC application-specific integrated circuit
- Fig. 1A s ows schematically a vehicle in which the present invention may be used.
- Fig. IB shows a control device in the control system, for the vehicle shown in Fig. 1.
- Fig. 2 shows the combustion engine in the vehicle shown in
- Fig. 1 in more detail.
- Fig. 3 shows an example embodiment according to the present invention .
- Fig. 4 shows an example of an estimated pressure track for a combustion, and an actual pressure track up to a first crank angle position.
- Figs. 5A-B show an example of regulation in situations with more than three injections.
- Fig. 6 shows an example of MPC .
- Fig, 1A shows schematically a driveline in a vehicle 100 according to an embodiment of the present invention.
- the driveline comprises one combustion engine 101, which in a customary manner, via an output shaft on the combustion engine 101, usually via a flywheel 102, is connected to a gearbox 103 via a clutch 106.
- the combustion engine 101 is controlled by the engine's control system via a control device 115.
- the clutch 106 which may consist of e.g. an automatically controlled clutch, as well as the gearbox 103 are controlled by the vehicle's control system with the help of one or more
- vehicle's driveline may also be of another type, such as a type with a conventional automatic gearbox, or a type with a manual gearbox, etc.
- An output shaft 107 from the gearbox 103 operates the driving wheels 113, 114 in a customary manner via the end gear and driving shafts 104, 105.
- Fig. 1A shows only one shaft with driving wheels 113, 114, but in a customary manner the vehicle may comprise more than one shaft equipped with driving wheels, or one or more extra shafts, such as one or more support shafts .
- the vehicle 100 also comprises an exhaust, system, with an af er-treatment system 200 for customary treatment
- combustion engines in vehicles of the type shown in Fig. 1A are often equipped with controllable in ectors, in order to supply the desired amount of fuel at the desired point in time in the combustion cycle, such as at a specific piston position (crank angle degree) in the case of a piston engine, to the combustion engine ' s combustion chamber.
- Fig. 2 snows schematically an example of a fuel injection system for the combustion engine 101 exemplified, in Fig. 1A. ⁇
- the fuel injection system consists of a so-called Common Rail system, but the invention is equally applicable in other types of injection systems.
- Fig. 2 shows only one
- combustion engine 101 consists, in the present example, of a six-cylinder combustion engine, and may generally consist of an engine with any number of
- cylinders/combustion chambers e.g. any number of
- the combustion engine also comprises at least one respective injector 202 for each combustion chamber (cylinder) 201.
- Each respective injector is thus used for injection (supply) of fuel in a. respective combustion chamber 201.
- two or more injectors per combustion chamber may be used.
- the injectors 202 are individually controlled by respective actuators (not shown) arranged at the respective injectors, which, based, on received control signals, e.g. from the control device 115, control the opening/closing of the
- opening/closing of the injectors 202 may be generated by some applicable control device, such as, in this example, by the engine control device 115.
- the engine control device 115 thus determines the amount of fuel which actually is to be injected at any given time, e.g. based on prevailing operating
- the injection system shown in Fig. 2 thus consists of a so-called Common Rail system, which means that all injectors (and therefore all combustion chambers) are supplied with fuel from a.
- common fuel conduit 204 Common Rail
- a fuel pump 205 is filled with fuel from a fuel tank (not shown) at the same time as the fuel in the conduit 204, also with the help of the fuel pump 205, is pressurised to a certain pressure.
- the highly pressurised fuel in the common conduit 204 is then injected into the combustion engine's 101 combustion chamber 201 when the respective injector 202 is opened.
- each combustion chamber is equipped with a respective pressure sensor 206 for sending of signals regarding a prevailing pressure in the combustion chamber to e.g. the control device 115.
- pressure sensor may e.g. be piezo-based and should be fast enough to be able to send crank angle resolved pressure signals, e.g. at every crank angle degree or more frequently.
- the combustion during a combustion cycle in a combustion chamber may at a large extent be controlled, e.g. with the use of multiple injections, where the times and/or duration of the injections may be controlled, and where data from e.g. the pressure sensors 206 may be taken i to consideration in connection with this control.
- injection times and/or duration for the respective injections and/or injected fuel amounts are adapted during ongoing combustion, based on data from the ongoing combustion.
- the energy released during combustion i a combustion engine will partly result in work, achieved, but. also result, in heating of exhausts and heat losses in the form of heating of the
- the combustion is controlled with regard to the heat loss which arises during combustion, e.g. through a control whose objective is to minimise the heat, losses at combustion while the desired work may still be achieved.
- Fig. 3 shows an example method 300, according to the present, invention, where the method, according to the present example is arranged to be carried out by the engine control device 115 shown in Figs. 1 ⁇ - ⁇ .
- control systems in modern vehicles consist, of a communication bus system consisting of one or more
- ECUs electronice control devices
- communications buses to connect a number of electronic control devices (ECUs) , such as the control device, or controller, 115, and various components arranged on the vehicle.
- ECUs electronice control devices
- such a control system may comprise a large number of control, devices, and the responsibility for a specific function may be distributed among more than one control device.
- Figs . 1A-B show o ly the co trol device 115, in which the present, invention is implemented in the embodiment, shown.
- the invention may, however, also be implemented in a control device dedicated to the present, invention, or wholly or partly in one or several other control devices already existing in the vehicle. Considering the speed at which calculations according to the present invention are carried out, the invention may be arranged to be implemented in a control device which is especially adapted for real time calculations of the type described below.
- the implementation of the present, invention has shown that e.g. ASIC and FPGA solutions are suitable for and cope well with calculations according to the present invention.
- control device 115 (or the control device (s) at which the present invention is implemented) according to the present invention may, apart from depending on sensor signals from the pressure sensor 202, e.g. depend on signals from other control devices or sensors.
- control devices of the type displayed are normally arranged to receive sensor signals from different parts of the vehicle, as well as from different control devices arranged on the
- the control is often controlled by programmed instructions.
- These programmed instructio s typically consist of a computer program, which, when it. is executed in a computer or control device, causes the computer/control device to carry out the desired control action, as a method step in the process according to the present invention.
- the computer program usually consists of a computer program product, where the computer program product comprises an applicable storage medium 121 (see Fig. IB), with the computer program stored on said storage medium 121.
- Said digital storage medium 121 may e.g. consist of any from the following group: ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable PROM), Flash, EEPROM (Electrically Erasable PROM), a hard disk unit, etc., and may be set up in or in combination with the control device, where the computer program is executed by the control device. By changing the computer program's instructions, the vehicle's behaviour may thus be adjusted in a specific situation.
- control device 115 is shown schematically in Fig. IB, and the control device in turn may comprise a calculation unit 120, which may consist of e.g. a suitable type of processor or microcomputer, e.g. a circuit, for digital signal processing (Digital Signal Processor, DSP) , one or several FPGA (Field-Programmable Gate Array) circuits or one or several circuits with a predetermined specific function (Application Specific Integrated Circuit, ASIC) .
- the calculation unit 120 is connected to a memory unit 121, which provides the calculation unit. 120 with e.g. the stored program code and/or the stored data which the calculation unit 120 needs in order to be able to carry out calculations.
- the calculation unit 120 is also set up to store interim or final results of calculations in the memory unit 121,
- control device is equipped with devices 122, 123, 124, 125 for receipt and sending of input and output signals.
- These input and output signals may contain waveforms, pulses, or other attributes, which may be detected as information for processing of the calculation unit 120 by the devices 122, 125 for the receipt of input signals.
- the devices 123, 124 for sending output signals are arranged to convert the calculation result from the calculation unit 120 into output signals for transfer to other parts of the vehicle's control system and/or the component (s) for which the signals are intended.
- Each one of the con ections to the devices for receipt and sendi g of input and output signals may consist of one or several of the following; a cable; a data bus, such as a CAN (Controller Area Network) bus, a MOST (Media Oriented Systems Transport) bus, or any other bus configuration; or of a wireless connection.
- a data bus such as a CAN (Controller Area Network) bus, a MOST (Media Oriented Systems Transport) bus, or any other bus configuration
- a wireless connection such as a Wi-Fi
- the method begins at step 301, where it is determined whether the control according to the invention of the combustion process should be carried out.
- the control may e.g. be arranged to be carried out continuously as soon as the combustion engine 101 is started.
- the control action may be arranged to be carried out e.g. as long as the combustion engi e's combustion is not. be co trolled according to some other criterion.
- simultaneous control of the combustion is carried out with respect to heat losses and at least one additional control parameter. For example, a weighing up may be carried out, where the control parameters' prioritisation on fulfilment of a desired control result may e.g. be arranged to be controlled according to some suitable cost function.
- the method according to the present invention thus consists of a method, for the control of the combustion engine 101 while the combustion takes place in said combustion chamber 201 in combustion cycles.
- combustion cycle is defined as the steps comprised in a combustion in a combustion engine, e.g. a two-stroke engine's two strokes and a four-stroke engine's four strokes.
- the term also includes cycles where no fuel is actually injected, but where the combustion engine is still operated with a certain engine speed, such as with the vehicle's driving wheels via the driveline in e.g. dragging. That is to say, even if no
- step 302 it. is determined whether a combustion cycle has been or will be started, and where this is the case, the method continues to step 303 while a parameter i representing an injection number is set equal to one.
- step 303 an injection schedule is determined which is expected to result in a desired heat loss during the
- combustion e.g. an injection schedule which is expected to minimise the resulting heat loss during the combustion of the combustion cyc1e .
- supply of the amount of fuel both with respect to quantity and manner of supply, i.e. the one or several fuel injections that are to be carried out during the combustion cycle., is normally defined in advance, e.g. depending on the work (torque) which the combustion engine is to carry out during the combustion cycle, since no change of the determined injection schedule is carried out during an ongoing combustion cycle according- to prior art.
- schedules may e.g. exist in tables in the vehicle's control system for a large number of operating modes, such as
- he re tabu1ated data may e.g. be prepared by way of applicable tests/measurements during e.g. the development of the combustion engine and/or vehicle, so that the applicable injection schedule may be selected based on prevailing- conditions, and where the injection schedule may be selected e.g. based on a wish regarding low heat loss.
- injection schedules may consist of the number of
- injections and respective characteristics in the form of e.g. point in time (crank angle position) at the start of the injection, the duration of the injection, the injection pressure, etc. may be stored for a large number of operating modes in the vehicle's control system, and e.g. be calculated/measured with the objective of resulting in a minimal heat loss.
- such a predetermined injection schedule is therefore applied in step 303, where this predetermined injection schedule is selected based on prevailing conditions and the work requested from the
- the injection schedule is
- step 303 a pre-defined injection schedule at the start of the combustion cycle is thus determined, where control action according- to the
- Fuel injection is thus normally carried out according to a predetermined schedule, where several injections may be arranged to be carried out during one and the same combustion cycle. This entails that the injections may be relatively short. For example, there are injection systems with 5-10 fuel injections/combustion, but the number of fuel injections may also be significantly greater, e.g. in the range of 100 fuel injections during one combustion cycle. The number of possible injections is controlled generally by the speed of the
- injec ions inspi are carried out during on ⁇ 3.nd the same combustion cycle but, as mentioned and as set. out. below, a greater number of injections may be arranged to be carried out, as well as only one.
- the injection schedule is thus, in the present example, determined in advance with the objective of obtaining some certain heat loss, e.g., under prevailing conditions, a minimal heat loss - i.e. given the prevailing combustion engine work, a heat loss as small as possible - during the combustion.
- a first injection inspi is carried out, and in step 304 it is determined whether said first injection inspi has been carried out and, if so, the method continues to step 305, where it is determined whether all the injections i have been carried out. Since this is not yet the case in the present example, the method continues to step 306 while i is
- the combustion process may generally be described with the pressure change in the combustion chamber which the combustion gives rise to.
- the pressure change during a combustion cycle may be represented by a pressure track, i.e. a representation of how the pressure in the combustion chamber varies during the combustion.
- a pressure track i.e. a representation of how the pressure in the combustion chamber varies during the combustion.
- the conditions in the combustion chamber will correspond to the conditions intended for the injection, and likewise the hitherto resulting pressure change (the pressure track as set out below) i the combustion chamber will correspond to the expected pressure change up to this point. As soon as the conditions deviate from the
- Fig. 4 also displays an actual pressure track 402 up to the crank angle position ⁇ ⁇ , which constitutes the prevailing position after said first combustion has been carried out.
- the pressure ⁇ ⁇ ⁇ in the combustion chamber is
- the pressure in the combustion chamber is determined substantially continuously, e.g. at each crank angle degree, every tenth crank angle degree or with another suitable interval during the entire combustion.
- the actual pressure track up to (pi deviates from the estimated pressure track 401, and the actual pressure ⁇ ⁇ ⁇ also deviates at (pi from the estimated pressure ⁇ ⁇ ⁇ est , according to the pressure track 401.
- the above means that the hitherto resulting heat loss has, with great probability, also deviated from the expected heat loss up to the crank angle position ⁇ ⁇ .
- step 307 an in ection schedule is therefore again
- control may e.g. be ca ried out according to the calculations displayed below, alternatively according to other applicable calculations with a similar objective, and be repea ed as set out below during an ongoi g- combustion cycle in order to, where needed, change the injection schedule during an ongoing combustion if the actually prevailing conditions in the combustion chamber deviate from the
- a model which describes the heat losses arising during the combustion.
- u constitutes the energy which is used in heat loss
- u constitutes a control variable, (e.g. the fuel supply to the combustion), i.e. a model which is prepared by determining a result for a large number of input parameters, where mav dt then be tabulated for a large number of conditions, such as different loads, engine speeds, air pressure, etc., which are known to a person skilled in the art within this area of technology.
- Another alternative which also constitutes the alternative applied in the present example, is the use of a physical model for heat losses during combustion in the combustion chamber.
- This model may consist of some applicable model and, according to the present example, the Woschni model, familiar to a person skilled in the art, is used tor the heat losses hi during combustion in a combustion engine.
- Heat losses in a combustion process are described primarily by temperature and pressure in the combustion chamber (in this case the cylinder ⁇ , and the gas movement. Temperature and pressure, however, are related to each other via the general gas law, which, as set out below, makes it possible to
- the heat released at combustion may be modelled as:
- T temperature in the cylinder
- w characteristic gas speed, here approximated to C t S p
- S p the piston's average speed in the cylinder, which may e.g. be tabulated, in the control system for different engine speeds, or calculated with the help of the engine speed and the stroke of the piston,
- C i constitutes a defined coefficient which, according to one example, may be set. as 2,28 with the addition of a piston average speed dependency.
- the coefficient is
- ⁇ constitutes the temperature difference between, the
- Equation (2) may be re-written with crank, angle dependency ( ⁇ ), so that the combustion gas temperature ⁇ may be expressed as : ⁇ ( ⁇ ) ⁇
- the substance amount n i.e. the substance amount or gas in the combustion chamber, will change over time (crank angle) as the combustion progresses .
- the substance amount n changes in connection with the chemical reactions which occur during the combustion. This change, however, is normally only one or a few percentages, so that the substance amount n f according to one embodiment may be assumed to consist of the substance amount before the combustion, so that the substance amount ⁇ ( ⁇ may thus be assumed to be constant. According to one
- the change in the substance amount during combustion may be estimated in order to provide a more
- the heat losses may thus be estimated as a function of crank angle according to equation (4), where already arisen heat losses may be
- the estimation of the total expected heat losses, or of those for the subsequent part of the combustion cycle, during the combustion thus requires knowledge about the variation of the pressure p during the combustion.
- the pressure may p be
- the present invention strives, however, to actively control, e.g. with the objective of minimising- or controlling toward another applicable level, heat losses during combustion, which may be carried out by predicting the expected pressure track in the combustion chamber for the subsequent part of the combustion cycle, so that also the expected heat loss for the entire combustion is estimated.
- the expected heat loss may be estimated for several different scenarios at combustion, such as different injection schedules , where the respective injection schedule will give rise to a specific pressure track, e.g. the pressure track shown in Fig. 4, which is estimated for the s ecific inject io schedu1e .
- a model of the combustion may be used, and, as is familiar to one skilled i the art, the combustion may be modelled according to equation (6): dQ - K calibrate (Q fuel - Q) (6)
- K caUbrate is used to calibrate the model.
- K caUbrate consists of a constant which is usually in the range of 0-1, but may also be arranged to assume other values, and which is determined individually, cylinder by cylinder, or for a certain engine or engine type, and depends in par ⁇ .icu i r o the design of the injector nozzles (spreaders) ,
- the combustion dO consists of amount of energy burned.
- the combustion dO is thus proportionate to the injected fuel amount minus the hitherto consumed fuel amount.
- the combustion clQ may,
- the combustion may also constitute a function which depends on a model of turbulence which arises when air/fuel is supplied, which may impact the combustion to different extents, depending on the amount of air/fuel
- these may e.g. be modelled as a sum of step functions: ( - ini , start) k ) ⁇ - ⁇ (t - (3 ⁇ 4 . end ) 3 ⁇ 4 )
- the fuel flow measured as the supplied mass m at an injection k i.e. how the fuel enters into the combustion chamber during the time window u when the injection is carried out, expressed as the duration of the crank angle degree ⁇ interval during which the injector is open, may be modelled for a specific injection k as: dm
- f (m) e.g. depends on the injection pressure, etc.
- f (m) may e.g. be measured or estimated in advance.
- the energy value Q Lf1 v for the fuel, such as diesel or petrol, is generally specified, so that such a general specification may be used.
- the energy value may also be specifically
- the energy value may also be arranged, to be estimated by the vehicle's control system.
- the equation (6 ⁇ may be resolved and the heat release Q may be determined as the combustion progresses.
- the pressure change in the combustion chamber during the entire combustion may be estimated as:
- ⁇ generally constitutes the heat capacity ratio, i.e. , where C B and/or C v are generally prepared and
- Equation (9) f f fdQ ⁇ dV ⁇ (J - 1 ⁇
- V - V uai +J dp p initiai +J (—-—p—J (—J d ⁇ p (10)
- Pinital constitutes an initial pressure which, before the start of the combustion' s compression step, may e.g. consist of the ambient pressure for combustion engines without a turbo, or a prevailing combustion air pressure for an engine with a turbo.
- p initai may constitute the then prevailing pressure, as determined by the pressure sensor 206, i.e. ⁇ ⁇ ⁇ in the present example.
- the pressure p in the combustion chamber may be estimated for the entire combustion, i.e. an expected curve corresponding to the curve 401 in Fig. 4 may be estimated, so that the heat loss for the entire combustion may also be estimated by using the above equations ,
- I O represents the opening of an inlet valve
- EVO represents the opening of an exhaust valve
- the cylinder geometry including the cylinder diameter, is fixed, and. the gas speed may be difficult to control during an ongoing combustion.
- the substance amount is relatively constant during the combustion (and may, according to the above, according to one embodiment, be assumed to be constant ⁇ and, in addition, unsuitable, at least for being the only control parameter, since the substance amount to a large extent is controlled by the fuel supplied, which in turn to a great extent is controlled by the requested work.
- Control of the pressure in the combustion chamber may thus be carried out by cont olling the fuel in ection, and, i step 307, by carrying out an estimation of the heat losses for a number of different injection schedules with varying injection times/injection durations/number of injections, an injection schedule may thus be determined which, to an applicable or as great an extent as possible, minimises the neat losses, or controls these toward another applicable level, during the combustion.
- an injection schedule may be determined, such as an injection schedule among several defined injection schedules, which best minimises the heat losses according to the above equations, where such injection schedule may be determined individually, cylinder by cylinder, based on sensor signals from at least one pressure sensor in the respective combustion chamber ,
- calculations of the type described above may be carried out for each one of these available injection schedules. Alternatively, the calculations may be carried out for the injection schedules which, for some reason, most probably are deemed to result in a low/desired heat loss.
- the injection schedule selected in step 307 may thus consist of only the next
- step 307 the method reverts to step 304 in order to carry out the next injection, so that this also gives rise to a combustion, and thus a heat release and a pressure track, where this will also probably deviate from the pressure track predicted in advance.
- step 304 the combustion, also at subsequent injections, will probably be impacted by prevailing conditions in the combustion chamber when the injection is started.
- a new injection strategy for the remaining injections may be calculated by using the above equations, and the method then reverts to step 304 in order to carry out the subsequent fuel inj ection a.ccording to the ne inj ect. ion strategy ca1cu.1ated. in step 307, still with consideration for the work to be achieved during the combustion, which is normally controlled by some superior process, e.g. in response to a request for a certain driving force from, the vehicle's driver or another function in the vehicle's control system, e.g. a cruise control function.
- the control may thus be arranged to be carried out after each injection i, and when all subsequent injections i have been carried out, the method reverts from step 305 to step 301 to control a subsequent combustion cycle.
- the current pressure determination ⁇ ⁇ 1 is calculated by using the pressure sensor 206 as Pin iai described above, in order to again predict, neat loss to determine a new injection schedule based on the now prevailing conditions in the combustion chamber, but now thus with data obtained a little further along into the combustion. That is to say, ⁇ ,,, ⁇ after the first combustion and the similarly determined ⁇ ⁇ ⁇ for subsequent injections, where thus initial changes at calculations during the combustion cycle, and where fuel injections are adapted according to prevailing conditions after each injection, and,, as a
- the injection schedule may change after each injection.
- the present invention thus provides a method which adapts the combustion as the combustion progresses, and comprises
- the expected heat loss may thus be estimated for several different alternative injection schedules for the remaining injections, so that, the injection schedule resulting in the most advantageous heat loss may be selected when the next injection is to be carried out.
- the combustion is thus adapted during ongoing combustion based on deviations from the predicted combustion and, according to one embodiment, each time an injection ins i has been completed, as long as additional injections are to be carried out.
- the injection strategy may, already before the fuel injection starts, be determined in the manner described above, so that also the first injection is thus carried out according to an injection schedule determined as set out above .
- the substance amount at combustion has been assumed to be constant, which may be assumed to constitute a good approximation.
- the substance amount will, however, in practice vary as the combustion progresses, which is why, according to one embodiment, the substance amount, nis estimated as follows.
- n a! comb when all the fuel injected during the combustion cycle has burned.
- n bef0!V romh is determined with the help of A, i.e. the fuel/air ratio, and the supplied amount of fuel ri Ue i , and the total substance amount for fuel and combustion air is obtained.
- any EGR reversal may also be taken into account, since this impacts the substance amount in the combustion gas.
- Qtotal specifies the total fuel energy which is supplied to the combustion during the combustion cycle. Q now constitutes the energy amount which has hitherto been burned, and is
- control has hitherto been described in a manner where the characteristics for a subsequent injection are determined, based on prevailinq conditions in the combustion chamber, after the previous injection.
- the control may, however, also be arranged to be carried out continuously, where pressure dete tio s ma be ca ried out with the help of the pressure sensor also during an ongoing injection, and where the injection schedule may be calculated and corrected all the way, until the next injection is initiated.
- the ongoing injection may be impacted by calculated, changes in the injection schedule, also in the cases where several shorter injections are carried out.
- the injection may also consist of one single, longer injection, where changes to the ongoing injection may be made
- rate shaping e.g. by changing the opening area of the injection nozzle and/or the pressure with which the fuel is injected, based on estimations and measured pressure values during the injection.
- the fuel, supply during the combustion may comprise two fuel injections, where e.g. only the second or both injections are controlled e.g. with the help of rate shaping. Rate shaping may also be applied in the event three or more injections are carried out.
- different distributions between injections may be evaluated, and e.g. an injected fuel amount may be redistributed between subsequent injections and/or the injection time may be changed for one or several subsequent injections, where potential limitations with respect to e.g. the minimum permitted duration or fuel amount for a fuel injection is taken into consideration.
- the method may be arranged to carry out e.g. the above calculations for a number of possible scenarios, where the calculations may be carried out for different injection durations/amounts/times for the different injections, with corresponding cha ges in re1eased energy .
- control may therefore become relatively complex, since a large number of parameters may be varied and would thus need to be evaluated. For example, a very great number of injections may be arranged to be carried out. during one and the same
- combustion cycle such as ten, or even hundred or so
- a control action is applied where the injection nearest in time is considered to be a separate injection,, and subsequent fuel injections are considered to be one single additional "virtual" injection, so that the heat losses may be optimised between these two injections.
- Fig. 5A where the injection 501 corresponds to inspi, as set out above, the injection 502 corresponds to insp 2 , as set out above, and where the remaining injections 503-505 are treated as one single virtual injection 506, i.e.
- the injection 506 is treated as one injection with a fuel amount substantially corresponding to the total fuel amount for the injections 503-505, and where a distribution may be made between the injection 502 and the virtual injection 506, By proceeding in this manner, the shifting which occurs between inspa and subsequent injections does not need to be distributed specifically between the injections 503-505, but the distribution at this stage is made between the injection 502 and the "virtual" injection 506, respectively.
- the method is repeated., exactly as above, with a new determination of an injection schedule, in order to minimise eat losses, but with the injection 503 as a separate injection, see Fig. 5B, and the injections 504, 505 jointly constituting one virtual injection with a distribution as set out above.
- the virtual injection 506 is constituted by three injections, but as is obvious, the virtual injection 506 may comprise, from the beginning, more than three injections, such as tens of injections or hundreds of injections, depending on how many injections that are planned, to be carried out during the combustion cycle, so that the method is repeated until all the injections have been completed. It is also possible to use e.g. MFC (Model Predictive Control ⁇ in the control according to the invention.
- MFC Model Predictive Control ⁇ in the control according to the invention.
- MFC is shown in Fig. 6, where the reference curve 603 corresponds to the expected o'evelopraent for the accumulated heat losses during the heat release during the
- This curve may e.g. consist of a (lowest) level for heat loss, which may realistically be achieved during a combustion cycle at the given load and prevailing engine speed, and may, advantageously, be
- the curve 603 may in one embodiment consist of a curve
- the solid curve 602 up to the time k represents the actual heat losses arising to date and which have been calculated, as set out above, by using actual data from the crank angle resolved pressure transmitter.
- the curve 601 represents the predicted heat loss development based on the predicted
- Dashed injections 605, 606, 607 represent the predicted control signal, i.e. the injection profile which is expected to be applied, and 60S, 609
- the predicted injection profile is updated with applicable intervals, e.g. after each completed injection, in order to reach the final value sought, and which is given by the reference curve 603, and where the next injection is
- the present invention provides a method which allows for a very good control of a combustion process, and which adapts the combustion during ongoing combustion, in order to achieve a combustion with controlled heat losses.
- an injection schedule may also be partly selected based on one or several of the perspectives pressure amplitude, pressure change speed, exhaust
- application number: 1350507-8 ⁇ shows a method to, during a first combustion cycle, control a subsequent part of combustion during said first combustion cycle with respect to a temperature resulting in said subsequent combustion.
- CONTROL OF A COMBUSTION ENGINE VI shows a method to, during a first combustion cycle, estimate a first measure of nitrogen oxides resulting at combustion during said first combustion cycle, and based on said first measure, to control the
- the invention has been exemplified above in a manner where a pressure sensor 206 is used to determine a pressure in the combustion chamber, and with which pressure the heat losses may then be estimated.
- pressure sensors instead one (or several) other sensors may be used, e.g. high-resolution ion current sensors, knock sensors or strain gauges, where the pressure in the combustion engine may be modelled with the use of sensor signals from such sensors. It is also possible to combine different types of sensors, e.g. in order to obtain a more reliable estimation of the pressure in. the combustion chamber, and/or to use other- applicable sensors, where the sensor signals are converted into corresponding pressures for use in control, as set out above .
- the heat loss at combustion may be arranged to be controlled, with the help of e.g. exhaust valves, so that injection may be carried out according to a predetermined schedule, but where the exhaust valves are used to control the pressure in the combustion chamber and. thus also the heat losses .
- control may be carried out with some applicable type of regulator, or e.g. with the help of state models and state feedback (e.g. linear programming, the LQG method or similar).
- state models and state feedback e.g. linear programming, the LQG method or similar.
- the method, according to the invention, for the control of the combustion engi e may also be combi ed, with sensor signals from other sensor systems where the resolution of the crank, angle level is not available, e.g. another pressure
- the input signals of which may e.g. be used as input parameters in the estimation of e.g. eat losses with the use of computer-driven models instead of models of the type described above.
- the present invention has been exemplified above in relation to vehicles.
- the invention is, however, applicable to any vessels/processes where particle filter systems as per the above are applicable, e.g. watercrafts and aircrafts with combustion processes, as per the above.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
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DE112014001774.4T DE112014001774B4 (en) | 2013-04-25 | 2014-04-24 | Method and system for controlling an internal combustion engine |
BR112015024996A BR112015024996A2 (en) | 2013-04-25 | 2014-04-24 | Method and system for the control of an internal combustion engine |
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SE1350510-2 | 2013-04-25 | ||
SE1350510A SE539031C2 (en) | 2013-04-25 | 2013-04-25 | Method and system for controlling an internal combustion engine by controlling the combustion in an internal combustion chamber during the current combustion cycle |
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WO2014175819A1 true WO2014175819A1 (en) | 2014-10-30 |
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PCT/SE2014/050493 WO2014175819A1 (en) | 2013-04-25 | 2014-04-24 | Method and system for control of an internal combustion engine |
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BR (1) | BR112015024996A2 (en) |
DE (1) | DE112014001774B4 (en) |
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SE537190C2 (en) * | 2013-04-25 | 2015-03-03 | Scania Cv Ab | Method and system for controlling an internal combustion engine through control of combustion in an internal combustion chamber during the current combustion cycle |
SE537308C2 (en) * | 2013-04-25 | 2015-04-07 | Scania Cv Ab | Method and system for controlling an internal combustion engine through control of combustion in an internal combustion chamber during the current combustion cycle |
SE537305C2 (en) | 2013-04-25 | 2015-03-31 | Scania Cv Ab | Method and system for controlling an internal combustion engine through control of combustion in an internal combustion chamber during the current combustion cycle |
SE537313C2 (en) * | 2013-04-25 | 2015-04-07 | Scania Cv Ab | Method and system for controlling an internal combustion engine through control of combustion in an internal combustion chamber during the current combustion cycle |
SE539296C2 (en) * | 2013-04-25 | 2017-06-20 | Scania Cv Ab | Method and system for controlling an internal combustion engine by controlling the combustion in an internal combustion chamber during the current combustion cycle |
Citations (5)
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WO2008111904A1 (en) * | 2007-03-15 | 2008-09-18 | Scania Cv Ab (Publ) | Arrangement and method for controlling the burn in a combustion engine |
US20090234559A1 (en) * | 2006-09-22 | 2009-09-17 | Uwe Jung | Method and apparatus for generating injection signals for an injection system of an internal combustion engine |
US20100017095A1 (en) * | 2007-03-29 | 2010-01-21 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine control device |
US20120191325A1 (en) * | 2010-01-13 | 2012-07-26 | GM Global Technology Operations LLC | Injection fuel and load balancing control system |
US20120216777A1 (en) * | 2011-01-28 | 2012-08-30 | Cummins Intellectual Property, Inc. | System and method of detecting hydraulic start-of-injection |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US8195379B2 (en) * | 2010-01-13 | 2012-06-05 | GM Global Technology Operations LLC | Multi-pulse injection fuel and load balancing control system |
SE537190C2 (en) * | 2013-04-25 | 2015-03-03 | Scania Cv Ab | Method and system for controlling an internal combustion engine through control of combustion in an internal combustion chamber during the current combustion cycle |
SE537308C2 (en) * | 2013-04-25 | 2015-04-07 | Scania Cv Ab | Method and system for controlling an internal combustion engine through control of combustion in an internal combustion chamber during the current combustion cycle |
SE537305C2 (en) * | 2013-04-25 | 2015-03-31 | Scania Cv Ab | Method and system for controlling an internal combustion engine through control of combustion in an internal combustion chamber during the current combustion cycle |
SE537313C2 (en) * | 2013-04-25 | 2015-04-07 | Scania Cv Ab | Method and system for controlling an internal combustion engine through control of combustion in an internal combustion chamber during the current combustion cycle |
SE539296C2 (en) * | 2013-04-25 | 2017-06-20 | Scania Cv Ab | Method and system for controlling an internal combustion engine by controlling the combustion in an internal combustion chamber during the current combustion cycle |
-
2013
- 2013-04-25 SE SE1350510A patent/SE539031C2/en not_active IP Right Cessation
-
2014
- 2014-04-24 WO PCT/SE2014/050493 patent/WO2014175819A1/en active Application Filing
- 2014-04-24 BR BR112015024996A patent/BR112015024996A2/en not_active Application Discontinuation
- 2014-04-24 DE DE112014001774.4T patent/DE112014001774B4/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090234559A1 (en) * | 2006-09-22 | 2009-09-17 | Uwe Jung | Method and apparatus for generating injection signals for an injection system of an internal combustion engine |
WO2008111904A1 (en) * | 2007-03-15 | 2008-09-18 | Scania Cv Ab (Publ) | Arrangement and method for controlling the burn in a combustion engine |
US20100017095A1 (en) * | 2007-03-29 | 2010-01-21 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine control device |
US20120191325A1 (en) * | 2010-01-13 | 2012-07-26 | GM Global Technology Operations LLC | Injection fuel and load balancing control system |
US20120216777A1 (en) * | 2011-01-28 | 2012-08-30 | Cummins Intellectual Property, Inc. | System and method of detecting hydraulic start-of-injection |
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BR112015024996A2 (en) | 2017-07-18 |
DE112014001774T5 (en) | 2015-12-24 |
SE539031C2 (en) | 2017-03-21 |
DE112014001774B4 (en) | 2020-01-30 |
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