WO2020181310A1 - Système et procédé permettant de régler une longueur effective d'une bielle réglable en longueur - Google Patents

Système et procédé permettant de régler une longueur effective d'une bielle réglable en longueur Download PDF

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Publication number
WO2020181310A1
WO2020181310A1 PCT/AT2020/060066 AT2020060066W WO2020181310A1 WO 2020181310 A1 WO2020181310 A1 WO 2020181310A1 AT 2020060066 W AT2020060066 W AT 2020060066W WO 2020181310 A1 WO2020181310 A1 WO 2020181310A1
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WO
WIPO (PCT)
Prior art keywords
reciprocating piston
angle
connecting rod
engine
longitudinal axis
Prior art date
Application number
PCT/AT2020/060066
Other languages
German (de)
English (en)
Inventor
Siegfried Lösch
Helmut Melde-Tuczai
Martin Rath
Mirko NATHER
Original Assignee
Avl List Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Avl List Gmbh filed Critical Avl List Gmbh
Publication of WO2020181310A1 publication Critical patent/WO2020181310A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D15/00—Varying compression ratio
    • F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/06—Adjustable connecting-rods
    • 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
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • F02D2041/0095—Synchronisation of the cylinders during engine shutdown
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/005—Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation
    • F02N2019/008—Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation the engine being stopped in a particular position

Definitions

  • the invention relates to a system for setting an effective length of a length-adjustable connecting rod for a reciprocating piston engine, in particular an internal combustion engine.
  • the invention also relates to a method for setting an effective length of a length-adjustable connecting rod.
  • Reciprocating piston engines in particular internal combustion engines, generally have at least one reciprocating piston which oscillates along a reciprocating piston longitudinal axis in an operating mode.
  • a crank drive converts the oscillating movement of the reciprocating piston by means of a connecting rod into a rotational movement of a drive shaft.
  • length-adjustable connecting rods can be used. These preferably have a first connecting rod part and a second connecting rod part, which are moved towards and / or into each other by means of a length adjustment device, preferably by means of a hydraulic cylinder, in the direction of a connecting rod part longitudinal axis of the connecting rod parts, in particular telescopically.
  • the connecting rod part of the connecting rod that is connected to the reciprocating piston - together with the reciprocating piston - can rotate against the other connecting rod part when the reciprocating piston engine is in a sleep mode. If the reciprocating piston machine is put back into operation in such a twisted state, this can damage the components. For example, the connecting rod can bend or break, or the reciprocating piston can jam in a cylinder.
  • This object is achieved by a system according to claim 1 and a method according to claim 14.
  • Advantageous embodiments are claimed in the dependent claims. The teaching of the claims is hereby made part of the description.
  • a first aspect of the invention relates to a system for setting an effective length of a length-adjustable connecting rod for a reciprocating piston engine, in particular an internal combustion engine, having an angle setting device which is designed to set a defined angle ß, 0 ° ⁇ ß ⁇ 45 °, preferably 4 ° ⁇ ß ⁇ 45 °, to be set between the longitudinal axis of the connecting rod and the longitudinal axis of the reciprocating piston, as long as the reciprocating piston engine is in an idle mode or is being brought.
  • a second aspect of the invention relates to a method which is preferably carried out by means of a system according to the first aspect of the invention, comprising the following work steps:
  • a rest mode within the meaning of the invention is preferably present when a reciprocating piston engine, in particular an internal combustion engine, is not in drive mode, in particular combustion mode, and in particular does not convert any chemical energy from a fuel into kinetic energy.
  • a connecting rod longitudinal axis within the meaning of the invention is preferably one
  • a reciprocating piston longitudinal axis within the meaning of the invention is preferably one
  • a length adjustment device within the meaning of the invention is preferably a device which makes it possible to change an effective length of a connecting rod. This can be done hydraulically, for example, by means of a hydraulic cylinder. A mechanical adjustment of the length, for example by means of an eccentric, is also possible. The length adjustment can also be implemented using electrical components, for example using a linear motor. A length adjustment takes place in particular in the direction of the longitudinal axis of the connecting rod.
  • An angle adjustment device in the sense of the invention preferably enables the reciprocating piston engines to act in the idle mode or when switching to idle mode such that a defined angle ⁇ is set between a longitudinal axis of the connecting rod and a longitudinal axis of the reciprocating piston.
  • This can in particular be done hydraulically or pneumatically by means of a hydraulic / pneumatic cylinder.
  • the angle setting can also be implemented by means of electrical components, for example by means of an electric motor.
  • the angle adjustment device can preferably be designed as a hardware and / or software component or components.
  • the angle adjustment device preferably uses components that are already present in a reciprocating piston engine or a drive train.
  • the invention is based in particular on the knowledge that twisting of the connecting rod parts relative to one another can be prevented by a suitable position of the connecting rod.
  • the degrees of freedom of the connecting rod are specifically restricted by the bearings on the large and small connecting rod eyes and defined positions of the connecting rod. If, in the idle mode of the reciprocating piston engine, an angle ß, 0 ° ⁇ ß ⁇ 45 °, preferably 4 ° ⁇ ß ⁇ 45 °, is set between the longitudinal axis of the connecting rod and the longitudinal axis of the piston, this prevents - due to the degrees of freedom of the mechanical components - the first connecting rod part can rotate relative to the second connecting rod part. In the drive mode of the reciprocating piston machines, connecting rod parts do not twist - even without a rotation lock - due to the permanent movement of the reciprocating piston machines.
  • a mechanical anti-rotation device for example in the form of a groove between the reciprocating piston and the cylinder or between the first and second connecting rod part, is not required with the invention.
  • This has the advantage that no additional components - such as anti-rotation devices, guides or the like - have to be attached to the reciprocating piston and connecting rod. This reduces the weight of the moving parts and lowers the manufacturing costs. In addition, the susceptibility to wear caused by such additional components is prevented.
  • the angle setting device can preferably determine the operating mode of the reciprocating piston machine by accessing a control of the reciprocating piston machine, in particular an engine control, and / or by means of a sensor. By setting the angle ⁇ between the longitudinal axis of the connecting rod and the longitudinal axis of the reciprocating piston in the rest mode, it is prevented that the connecting rod parts can rotate relative to one another.
  • the angle setting device has a drive and a control unit and is in particular set up in such a way that the angle ⁇ is set via the drive shaft. If the angle ⁇ is set via the drive shaft, this has the advantage that the drive can, for example, be fixedly attached to a housing wall of the reciprocating piston engine. This makes it easier to control and supply the drive with energy.
  • Winkeleinstell issued at least one sensor to adjust the angle ß.
  • An angle sensor is advantageously used.
  • a sensor offers the advantage that the angle can be adjusted as precisely as possible according to the actual position of the reciprocating piston machine.
  • Angle setting device a starter or starter generator of the reciprocating piston machine as a drive and / or a motor controller of the reciprocating piston machine as a control unit and / or at least one sensor of the reciprocating piston machine to set the angle ⁇ .
  • the angle setting device has a control unit and a pressure generating unit which are set up in such a way that the angle ⁇ is set via a reciprocating piston by means of a defined pressure in a combustion chamber. According to this embodiment, the angle ⁇ is thus not set via the drive shaft, but - from the other side - via the reciprocating piston.
  • This has the advantage that existing components of the reciprocating piston engine, such as the reciprocating piston and an associated combustion chamber, can be used to build up a force for setting the angle a.
  • the pressure generating unit has a compressor and in particular a pressure reservoir.
  • a compressor of smaller dimensions can be selected through the pressure reservoir, since the pressure of a required amount of fluid can be built up over a longer period of time and can then be used quickly by means of the pressure reservoir.
  • control unit is part of an engine control of the reciprocating piston engine. This can reduce the costs of the system, since no additional control unit is necessary.
  • the angle adjustment device has at least one sensor, in particular a pressure sensor. This makes it easier to set the angle ⁇ , since, for example, the actual position of the reciprocating piston in a cylinder can be deduced from the measured pressure.
  • the reciprocating piston machine has at least two reciprocating pistons, and the angle adjustment device is set up in such a way that the same pressure is applied to at least two reciprocating pistons in order to set the angle ⁇ .
  • Reciprocating piston machines generally have several reciprocating pistons above a certain power. So that the angle adjustment device can apply the force required to bring the reciprocating pistons into the desired position, the application of pressure to several or all of the reciprocating pistons is advantageous in this case.
  • the angle ⁇ of a reciprocating piston is selected such that none of the reciprocating pistons is in a dead center position when the reciprocating piston machine is in a rest mode.
  • a dead center position within the meaning of the invention is preferably a position in which a reciprocating piston assumes a position in which rotation of a reciprocating piston and an associated first connecting rod part with respect to the corresponding second connecting rod part is possible due to the degree of freedom of guidance and storage.
  • this is in each case a reversal point of a reciprocating piston, at which it changes its direction of movement.
  • the angle adjustment device is set up in such a way that the angle ⁇ is determined indirectly via an angle a, in particular by means of an angle sensor, with a being spanned by a longitudinal axis of the reciprocating piston and an axis of cranking of an associated reciprocating piston on an associated crank star.
  • the angle ⁇ indicates the position of the drive shaft - including the crank drive - with respect to a reciprocating piston longitudinal axis.
  • the angle ⁇ can be measured more easily than the angle ⁇ .
  • an angle sensor can preferably be attached between the drive shaft and a corresponding housing. Possible cabling of the sensor is then preferably carried out via the fixed component of the sensor attached to the housing.
  • generally no cost-effective standard angle sensor can be used to measure the angle ⁇ , since the connecting rod is moved both translationally and rotationally.
  • the reciprocating piston engine is a 3-cylinder in-line engine, and the angle ⁇ is set to approximately 15 °.
  • the reciprocating piston engine is a 4-cylinder in-line engine, and the angle ⁇ is set to approximately 90 °.
  • the reciprocating piston engine is a 5-cylinder in-line engine, and the angle ⁇ is set to approximately 18 °.
  • the reciprocating piston engine is a 6-cylinder V-engine, and the angle ⁇ is set to approximately 15 °.
  • the reciprocating piston engine is an 8-cylinder V-engine, and the angle ⁇ is set to approximately 45 °.
  • the reciprocating engine is a boxer engine, an H engine or a swash plate motor, and the angle ⁇ is set such that no reciprocating piston is in a dead center position when the reciprocating engine is at rest. This also prevents the connecting rod parts from twisting with respect to one another and thus damaging components.
  • the system has an anti-twist device which can fix the system at the required angle ⁇ in the idle mode.
  • the anti-rotation device is used in particular for the purpose of transporting the reciprocating piston engine. If the reciprocating piston motor is being transported and neither a drive nor a pressure generating unit are connected, the anti-rotation device can prevent a reciprocating piston from moving into a dead center position.
  • the anti-twist device can in particular be implemented by a bolt. Such a bolt can, for example, connect a flywheel to a housing or a vibration damper or a belt pulley to the housing.
  • the angle adjustment device acts on the combustion chambers of at least two reciprocating pistons each with a defined pressure in order to set the angle ⁇ . All combustion chambers are preferably subjected to the same pressure in order to set the angle ⁇ . This is technically particularly easy to implement, since, for example, all combustion chambers are connected to a pressure reservoir. The pressure in the combustion chambers creates an equilibrium situation in which no reciprocating piston is in a dead center position.
  • Angle adjustment device set the angle ß using the following steps:
  • Control in particular a starter or start generator in order to set the angle ⁇ via the drive shaft.
  • the angle ⁇ is not set by applying pressure to the reciprocating piston, but by mechanically setting the drive shaft. This is particularly advantageous when the starter or start generator of the reciprocating piston engine is used as a drive. This means that additional components can be saved.
  • Angle adjustment device also perform the following steps:
  • the angle ß Determining the angle ß as a function of angle a, a connecting rod length L and a stroke radius r. This is advantageous because the angle ⁇ is technically easier to measure than the angle ⁇ .
  • the angle a can, for example, be read off directly between the drive shaft and the motor housing using inexpensive angle sensors. To measure the angle ⁇ , more complex sensors are necessary, since the connecting rod moves both in a translatory and in a rotary manner.
  • FIG. 1 shows a first embodiment of a system for setting an effective length of a length-adjustable connecting rod for a reciprocating piston engine
  • FIG. 3 shows a plan view of a crank star of a 3-cylinder in-line engine according to FIG. 2 after activation of an angle adjustment device;
  • FIG. 5 shows a plan view of a crank star of a 4-cylinder in-line engine according to FIG. 4 after activation of an angle adjustment device
  • FIG. 7 shows a plan view of a crank star of a 5-cylinder in-line engine according to FIG. 6 after activation of an angle adjustment device
  • FIG. 8 shows a crankshaft of a 6-cylinder V-engine
  • 9 is a plan view of a crank star of a 6-cylinder V-engine according to FIG.
  • Fig. 11 is a plan view of a crank star of an 8-cylinder V-engine according to
  • FIG. 12 shows a second exemplary embodiment of a system for setting an effective length of a length-adjustable connecting rod for a
  • FIG. 13 shows a first exemplary embodiment of a method for setting an effective length of a length-adjustable connecting rod for a
  • FIG. 14 shows a second exemplary embodiment of a method for setting an effective length of a length-adjustable connecting rod for a
  • FIG. 1 shows a first exemplary embodiment of a system 1 for setting an effective length of a length-adjustable connecting rod 2 for a reciprocating piston engine.
  • the reciprocating piston engine is described below in a non-restrictive and purely exemplary manner as an internal combustion engine.
  • the internal combustion engine has at least one reciprocating piston 6.
  • a fuel is burned in a combustion chamber 14 and the reciprocating piston 6 is set in an oscillating movement along a reciprocating piston longitudinal axis 6a in this way.
  • a crank drive 7 converts the oscillating movement of the reciprocating piston 6 into a rotation of a drive shaft 8 (runs normal to the plane of the sheet of FIG. 1).
  • the crank drive 7 in turn has a connecting rod 2 which can be adjusted in length via a length adjustment device 5.
  • the connecting rod 2 has a first connecting rod part 3 and a second connecting rod part 4.
  • the connecting rod parts 3 and 4 are preferably hydraulically displaceable towards one another / into one another along a longitudinal axis 2a of the connecting rod part, in order to set the desired length of the connecting rod 2.
  • the first connecting rod part 3 - together with the reciprocating piston 6 - can rotate against the second connecting rod part 4 when a reciprocating piston longitudinal axis 6a and a connecting rod longitudinal axis 2a are aligned.
  • a rotation can occur when an internal combustion engine with the structure described is transported in the parked state, for example by train or with a truck.
  • Rotation of the connecting rod parts 3, 4 could be prevented by a guide or a groove in the length adjustment device 2.
  • a solution was chosen which does not necessarily require such a guide to prevent rotation.
  • a control unit 11 activates a pressure generating unit 13 in the idle mode of the internal combustion engine.
  • the control unit 11 is preferably part of an existing engine control of the internal combustion engine.
  • the pressure generating unit 13 is preferably a compressor.
  • the pressure generating unit 13 applies a defined pressure to the combustion chamber 14 in order to set an angle ⁇ between the reciprocating piston longitudinal axis 6a and the connecting rod longitudinal axis 2a through the movement of the reciprocating piston 6 caused thereby.
  • 30 bar with a correspondingly adapted flow rate can be selected as a defined pressure.
  • an angle ⁇ also indicates the position of the reciprocating piston 6 or the position of the crankshaft 8.
  • the angle a lies between a reciprocating piston longitudinal axis 6a and an associated offset axis 15 of an associated reciprocating piston 6.
  • the angle a indicates the position of the drive shaft 8 - including the crank drive 7 - with respect to a reciprocating piston longitudinal axis 6a.
  • the internal combustion engine can be a 3-cylinder in-line engine, for example. This has three reciprocating pistons 6 according to FIG. 1, which, as shown in FIG. 2 and FIG of a crank drive 7 are connected to a drive shaft 8.
  • the crankshaft 8 of the crankshaft drive 7 has three crankings - evenly distributed over the circumference - with their respective cranking axes 15.
  • all three reciprocating pistons 6 of the 3-cylinder in-line engine - when this is in a rest mode - are each acted upon by at least essentially the same pressure by means of the pressure generating unit 13.
  • the pressure generates a torque on the crankshaft 8, the magnitude and sign of which depends on the position of the respective offset axis 15 of the individual reciprocating pistons in relation to the connecting rod 2.
  • the reciprocating pistons 6 and thus also the crankshaft 8 then automatically assume that position in which an equilibrium is established between the torques of the three reciprocating pistons.
  • the crankshaft 8 can rotate the respective offset axis 15 through a dead center or turn back through the dead center. This can be either the top or bottom dead center.
  • a dead center is the position of the reciprocating piston 6 in the respective cylinder, in which an oscillating movement of the reciprocating piston 6 changes the direction of movement.
  • the top dead center is arranged in the direction of the injection valves and the bottom dead center in the direction of the drive shaft.
  • the pressure generating unit 13 consists for example of a compressor and a pressure reservoir.
  • the pressure reservoir preferably has reservoir inlet valves and reservoir outlet valves. If the pressure reservoir is filled by means of the compressor, the reservoir inlet valves are open, the reservoir outlet valves are closed, and the compressor preferably conveys ambient air into the pressure reservoir. When the required pressure is reached, the reservoir inlet valves are closed and the compressor is switched off.
  • cylinder inlet valves and cylinder outlet valves of the respective reciprocating pistons 6 are appropriately controlled.
  • the cylinder inlet valves are used in particular for fuel injection, and the cylinder outlet valves in particular to expel exhaust gases after the combustion process has taken place.
  • the pressurization is preferably carried out by means of the pressure generating unit 13 via at least one partially open cylinder inlet valve, while the cylinder outlet valve or the cylinder outlet valves are at least partially closed. To do this, the Reservoir outlet valves and the cylinder inlet valves open and so do the reciprocating pistons
  • the angle ⁇ to be set for the energy minimum is around 15 °.
  • a crank axis 15 of a reciprocating piston 6 of the crank star 16 must assume the aforementioned angle to the reciprocating piston longitudinal axis 6a. This ensures that none of the three reciprocating pistons 6 is in a dead center position or comes to a standstill. Mutual rotation of the connecting rods 3, 4 is thus prevented and damage to the components of the internal combustion engine is avoided when it starts up again.
  • the reservoir outlet valves can also open directly into the cylinder. In this case, both the cylinder inlet valves and the cylinder outlet valves are closed and then the reservoir outlet valves are opened in order to apply pressure to the reciprocating piston.
  • the angle setting described above by means of a pressure generating unit 13 can also be used analogously for internal combustion engines with two or even more than three reciprocating pistons.
  • the same pressure is applied to all of the reciprocating pistons 6, and the reciprocating pistons 6 and the crankshaft 7 then independently assume that position in which the pressure energy present in the combustion chambers 14 reaches a minimum.
  • crank star 16 is set in the position of the energy minimum at an angle ⁇ of approximately 90 °.
  • crank star 16 is set in the position of the energy minimum at an angle ⁇ of approximately 18 °.
  • the five cranks 15 of the reciprocating piston 6 are evenly distributed over the circumference of the crankshaft, which corresponds to a division of 72 ° in each case.
  • Fig. 8 shows the crankshaft of a 6-cylinder V-engine.
  • Two reciprocating pistons 6 each hang on a common offset axis 15 of a crankshaft 8
  • the reciprocating piston longitudinal axes 6a of these reciprocating pistons 6 which belong together have a V shape with respect to one another, which intersect the center point of the drive axis 8.
  • the three crank axes 15 are evenly distributed over the circumference of the crankshaft 8, as shown in FIG. 9 on the basis of the crank spider 16.
  • the angle a lies between a reciprocating piston longitudinal axis 6a and an offset axis 15.
  • the angle is set to an angle a of approximately 15 °.
  • FIGS. 10 and 11 show an 8-cylinder V-engine crankshaft 8.
  • two reciprocating pistons 6 each hang on a crank axis 15, their reciprocating piston longitudinal axes 6a adopting a V shape with respect to one another.
  • the four cranks 15 of the eight reciprocating pistons 6 are evenly distributed over the circumference of the crankshaft 8. In this case, the angle is set to an angle ⁇ of approximately 45 °.
  • FIG. 12 shows an alternative exemplary embodiment of a system 1 for setting an effective length of a length-adjustable connecting rod.
  • the angle adjustment device 9 is not implemented by means of a pressure generating unit 13, but by means of a drive 10.
  • a starter or start generator of the internal combustion engine is preferably used as the drive 10.
  • An angle sensor 12 preferably measures the position of the crankshaft 8 or the drive shaft 8.
  • a control unit 11 processes the sensor signal and controls the drive 10 in order to set the required angle ⁇ or ⁇ .
  • the starter rotates the crankshaft to an angle of about 15 °.
  • the value of the angle a should be between about 15 ° and about 18 °.
  • turning to a value of the angle ⁇ of about 15 ° to about 45 ° would be sufficient.
  • the aim in all of the cases described is to prevent a reciprocating piston from coming to rest in a dead center position.
  • the required angle a depends on the number of cylinders and their arrangement.
  • the angle ⁇ can thus vary from approximately 15 ° to approximately 90 ° and the corresponding angle ⁇ from approximately 4 ° to approximately 45 °.
  • An angle adjustment device 9 carries out the following work steps: Determining 101 an operating mode of the 3-cylinder in-line engine. This is preferably done by reading out a motor controller.
  • the 3-cylinder in-line engine is acted on 102, so that an angle ⁇ between the longitudinal axis 2a of the connecting rod and the longitudinal axis 6a of the piston is 0 ° ⁇ ⁇ 45 °, preferably 4 ° ⁇ ß ⁇ 45 °, is set.
  • all three combustion chambers are subjected to the same pressure 102a, preferably by connecting all three combustion chambers to a pressure reservoir. The pressure in the combustion chambers creates an equilibrium situation in which no reciprocating piston is in a dead center position.
  • At least one inlet valve per reciprocating piston of the internal combustion engine is preferably kept open or open, 102b, in particular during the application of pressure. More preferably, an outlet valve or outlet valves of the reciprocating piston is or are kept closed or kept closed, 102c, in particular during the application of pressure. Furthermore, all inlet valves and outlet valves of the associated reciprocating piston are preferably closed or kept closed, 102d, when the application of pressure has been completed.
  • the pressure built up cannot escape from the associated combustion chamber 14 and the set angle ⁇ between connecting rod longitudinal axis 2a and reciprocating piston longitudinal axis 6a remains set to 0 ° ⁇ ⁇ 45 °, preferably 4 ° ⁇ ⁇ 45 °.
  • An angle adjustment device 9 carries out the following work steps:
  • Determination 201 of an operating mode of the 3-cylinder in-line engine This is preferably done by reading out a motor controller.
  • an angle a is measured, in particular by means of an angle sensor a indicates the position of a reciprocating piston 6 or the position of a crankshaft 8.
  • the angle a lies between a reciprocating piston longitudinal axis 6a and an associated offset axis 15 of an associated reciprocating piston 6.
  • the angle a gives the position of Drive shaft 8 - together with the crank drive 7 - with respect to a reciprocating piston longitudinal axis 6a.
  • an action 202 on the 3-cylinder in-line engine so that an angle ⁇ between the longitudinal axis 2a of the connecting rod and the longitudinal axis 6a of the reciprocating piston is set to 0 ° ⁇ ⁇ 45 °, preferably 4 ° ⁇ ⁇ 45 °.
  • a starter or starter generator is preferably activated 202a in order to set the angle ⁇ via the drive shaft.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transmission Devices (AREA)

Abstract

L'invention concerne un système (1) permettant de régler la longueur effective d'une bielle (2) réglable en longueur pour un moteur à piston alternatif. La bielle (2) présente au moins une première partie de bielle (3) et une seconde partie de bielle (4) qui peuvent être déplacées l'une vers l'autre et/ou l'une dans l'autre dans la direction d'un axe longitudinal (2a) des parties de bielle (3, 4) au moyen d'un dispositif de réglage de la longueur (5). Le moteur à piston alternatif comporte au moins un piston alternatif (6) qui oscille le long d'un axe longitudinal (6a) du piston alternatif. Un entraînement à manivelle (7) convertit le mouvement oscillant du piston alternatif (6) au moyen de la bielle (2) en un mouvement de rotation d'un arbre d'entraînement (8). Le système (1) comporte un dispositif de réglage d'angle (9) qui est conçu pour régler un angle défini β, 0° < β ≤ 45°, de préférence 4° ≤ β ≤ 45°, entre l'axe longitudinal (2a) des pièces de la bielle et l'axe longitudinal (6a) du piston alternatif tant que le moteur à piston alternatif est en mode de repos ou est amené en mode de repos. L'invention concerne en outre un procédé (100, 200) de réglage de la longueur effective d'une bielle (2) réglable en longueur pour un moteur à piston alternatif. Le moteur à piston alternatif est équipé d'un dispositif de réglage de l'angle (9) qui effectue au moins les opérations suivantes : déterminer un mode de fonctionnement du moteur à piston alternatif (101, 201) ; et lorsque le moteur alternatif est en mode de repos, agir (102, 202) sur le moteur à piston alternatif de sorte qu'un angle β entre l'axe longitudinal de la partie de bielle (2a) et l'axe longitudinal du piston alternatif (6a), soit réglé à 0° < β ≤ 45°, de préférence 4° ≤ β ≤ 45°.
PCT/AT2020/060066 2019-03-08 2020-03-06 Système et procédé permettant de régler une longueur effective d'une bielle réglable en longueur WO2020181310A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50189/2019 2019-03-08
ATA50189/2019A AT522071B1 (de) 2019-03-08 2019-03-08 System und Verfahren zum Einstellen einer wirksamen Länge einer längenverstellbaren Pleuelstange

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WO2020181310A1 true WO2020181310A1 (fr) 2020-09-17

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PCT/AT2020/060066 WO2020181310A1 (fr) 2019-03-08 2020-03-06 Système et procédé permettant de régler une longueur effective d'une bielle réglable en longueur

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DE10258872A1 (de) * 2002-12-17 2004-07-08 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betrieb eines mehrzylindrigen Verbrennungsmotors mit variablem Verdichtungsverhältnis
DE102004043528A1 (de) * 2004-09-08 2006-03-23 Siemens Ag Verfahren zum Optimieren eines internen Direktstarts einer fremdgezündeten Brennkraftmaschine mit veränderlichem Verdichtungsverhältnis
EP1669576A1 (fr) * 2004-12-03 2006-06-14 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Procédé de contrôle de l'arrêt d'un moteur à combustion interne
DE102013225074A1 (de) * 2013-12-06 2015-06-11 Robert Bosch Gmbh Verfahren zum Stoppen einer Verbrennungskraftmaschine
AT15576U1 (de) * 2016-04-29 2018-03-15 Avl List Gmbh Längenverstellbare Pleuelstange

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WO2016203047A1 (fr) * 2015-06-18 2016-12-22 Avl List Gmbh Bielle réglable en longueur

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Publication number Priority date Publication date Assignee Title
DE10258872A1 (de) * 2002-12-17 2004-07-08 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betrieb eines mehrzylindrigen Verbrennungsmotors mit variablem Verdichtungsverhältnis
DE102004043528A1 (de) * 2004-09-08 2006-03-23 Siemens Ag Verfahren zum Optimieren eines internen Direktstarts einer fremdgezündeten Brennkraftmaschine mit veränderlichem Verdichtungsverhältnis
EP1669576A1 (fr) * 2004-12-03 2006-06-14 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Procédé de contrôle de l'arrêt d'un moteur à combustion interne
DE102013225074A1 (de) * 2013-12-06 2015-06-11 Robert Bosch Gmbh Verfahren zum Stoppen einer Verbrennungskraftmaschine
AT15576U1 (de) * 2016-04-29 2018-03-15 Avl List Gmbh Längenverstellbare Pleuelstange

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