JP6813943B2 - Linear actuator for continuously variable stroke type cycle engine - Google Patents

Description

The embodiments disclosed herein relate to internal combustion engines, especially piston internal combustion engines. In particular, the embodiments disclosed herein relate to actuators and assemblies for variable stroke cycle internal combustion engines.

An internal combustion engine is an engine in which fuel is burned by an oxidant in a combustion chamber, which is an integral part of a working fluid flow circuit. In an internal combustion engine, the expansion of the hot and high pressure gas produced by combustion exerts a direct force on certain components of the engine, typically the pistons. This force moves this component over a distance, converting chemical energy into useful mechanical energy.

In one aspect, an embodiment disclosed herein is a variable stroke reciprocating internal combustion engine, the internal combustion engine having a piston configured to reciprocate in a cylinder chamber comprising an engine shaft and an axis. Each piston has a first piston portion, the first piston portion being aligned with or a second piston portion to define a piston stroke for different thermal functions of the internal combustion engine. The internal piston engine has an assembly rotatably coupled to the first piston portion at the copying point and an actuator coupled to this assembly, which operates separately from the piston portion of the. The present invention relates to an internal combustion engine characterized in that it can be operated so as to control the operation of an assembly to determine a substantially linear motion of a copying point along a cylinder chamber axis.

In another aspect, an embodiment disclosed elsewhere is a method of operating a variable stroke reciprocating internal combustion engine such that the internal combustion engine reciprocates in a cylinder chamber provided with an engine shaft and an axis. It has a configured piston, each piston having a first piston portion, the first piston portion with a second piston portion to define piston strokes for different thermal functions of the internal combustion engine. It can be actuated to move in unison or separately from the second piston portion, and this method is coupled to the assembly and assembly rotatably coupled to the first piston portion at the copying point. The present invention relates to a method comprising a step of preparing an actuator and a step of operating the actuator to control the movement of the assembly, thereby defining a substantially linear movement of a copying point along the cylinder chamber axis.

The present invention is shown in the accompanying drawings.

It is a schematic diagram of an embodiment of a piston-train guide assembly. FIG. 5 is a cross-sectional view perpendicular to the rotation axis of the crankshaft of the embodiment of the engine having the piston-train guide assembly of FIG. It is a figure which shows the embodiment of the curved guide linear actuator mechanism body. It is a figure which shows the embodiment of the pantograph type guide linear actuator mechanism body. It is a figure which shows the embodiment of the pantograph type guide linear actuator mechanism body.

The viewpoints, features and advantages of one or more embodiments referred to herein will be described in detail with reference to the drawings, where the same reference numerals indicate the same elements. The embodiments disclosed herein provide an assembly and a guide or guide assembly that is incorporated within the piston-train of a differential or variable stroke internal combustion engine that may be incorporated separately or within a single device. To do. In certain embodiments, the assembly may be referred to as a robot arm assembly. In other embodiments, the assembly may be referred to as an actuator assembly. The robot assembly was extended towards the cylinder axis so that the arm-shaped lever device moved the piston stem of the piston portion (eg, the first or inner piston portion) in a substantially linear longitudinal motion along the cylinder axis. In the state, it is better to attach it to the engine block or somewhere else at one end.

It can be said that it is advantageous that the combination of the four engine strokes in terms of retreat amount and period is continuously optimized in real time during engine operation for fuel efficiency, output and emission. For this purpose, it is preferable to utilize a robot optimization device equipped with a robot arm controlled by an electronic control unit of the engine and extending in the cylinder axis and acting directly on the piston stem. The robot arm device is preferably coupled to the piston stem to actuate the first piston portion. The robotic apparatus should be located away from the cylinder chamber and away from the moving parts of the piston kit. The robot arm device is preferably configured to perform multidimensional directional movement to maintain linear length directional movement of the piston stem and the first piston portion along the cylinder axis. In certain embodiments, a linear robot device or linear actuator device acting on the piston lever is provided to maintain linear longitudinal motion of the piston stem and first piston portion along the cylinder axis.

With reference to FIG. 1, a schematic representation of a piston-train guide assembly as one or more embodiments of the present invention is shown. The piston-train guide (or assembly) 100 is preferably incorporated within the piston-train within the differential stroke internal combustion engine shown in FIG. As used herein, the term "piston-train" includes a piston, a piston lever-link-bar and a piston lever-link-bar guide assembly that is coupled to each other as an assembly and can operate within the engine. In some cases. In the present specification, the guide assembly may also be referred to as a control / guide device or a control / linkage assembly.

A differential stroke internal combustion engine typically includes an inner or first engine block 210 with one or more cylinder bores 212 and an inner or first one provided within each of the one or more cylinder bores 212. Has a piston portion 220 of. The inner piston portion 220 is preferably in sliding contact (or contact) engagement with the corresponding cylinder bore wall 213. The piston stem 230 is hinged (rotatably) to the piston lever-link-bar 110 at the first end 232 and to the inner piston portion 220 at the second end 234. The hinged coupling (rotary junction) can define a "copy" point 102, which will be described in detail below.

The guide device 100 constitutes a linkage assembly (eg, a four-bar rotation mechanism) including a portion 111 of a piston lever-link-bar 110, a fulcrum (fulcrum) -link bar 112, a force-bar 114 and a rocker-link bar 118. And have. In constructing the four-bar rotation mechanism and determining the location of the mechanism, the guide device 100 is a first hinge of the first end of the fulcrum-link bar 112 and the first end of the rocker-link bar 118. It is preferably hinged to the engine block 210 at the joint 120. The hinged coupling (rotating junction) defines an "anchor" (or attachment) point 104, described in detail below. The four-bar rotation mechanism is a second hinge joint 122 between the second end of the full crumb-link bar 112 and the first end of the piston lever-link-bar 110 portion 111, the rocker-link bar 118. A third hinge joint 124 between the second end and the first end of the force-link bar 114 and a second end of the force-link bar 114 and a portion 111 of the piston lever-link-bar 110. It further includes a fourth hinge junction 126 with a second end.

A guide element or guide roller 130 is coupled (eg, rotatable or rotatable) to a force-link bar 114 at an "origin" point (or axis) 106. The "original" point 106 is the intersection of the force-link bar 114 with an imaginary line (indicated by line 108) defined between the "copying" point 102 and the "sticking" point 104. Is located in. The guide roller 130 is preferably in a sliding or rolling contact relationship with the guide device 240. In certain embodiments, the guide device 240 may be integrally formed within the engine block 210 and as a structure constructed thereby. For example, the guide device may be formed as a channel, groove or other structure in the engine. In other embodiments, the guide device 240 may be securely attached or fastened to the engine block 210. As shown in FIG. 1, in certain embodiments, the guide device 240 may be linear or substantially linear. The guide roller 130 moves in the guide device 240 so that the guide roller 130 and the "origin" point 106 move along the guide axis 150 of the guide device 240 in which the cylinder 212 is parallel to the cylinder axis 250. In certain embodiments, the guide element is an arbitrary form of spring element coupled to the linkage assembly to urge the copy point to the center and control this copy point substantially along the cylinder chamber axis. (Not shown) should consist of.

The four-node rotation mechanism of the guide device 100 is preferably configured to form a pantograph assembly or device. As will be appreciated by those skilled in the art, pantograph assemblies can be formed with mechanical linkages connected to each other in a parallelogram manner, resulting in one location in the assembly (eg, the "origin"). The motion at point 106) causes a corresponding motion (possibly scaled motion) at a second location in the assembly (eg, "copying" point 102).

In certain embodiments, the scaling motion of the "copy" point 102 is constrained along the cylinder axis 250 by the motion of the "origin" point 106 along the guide axis 150. This pantograph assembly of a four-node rotation mechanism that effectively transforms motion in a controlled manner is used as a motion guide for "copy" point 102. Thus, in certain embodiments, the four-bar rotation mechanism guides the piston lever-link-bar 110 in a linear motion along the cylinder axis 250 in the longitudinal direction to rotate and join with the piston stem 230. A pantograph device is configured to move at a section (ie, "copy" point 102). In other words, when the "origin" point 106 is moving along the guide axis 150 of the linear guide 240, the "copy" point 102 moves in a linear motion along the cylinder axis 250 of the cylinder 212. ..

As will be appreciated, other guide elements or devices may also be incorporated into the quadrant rotation mechanism of the guide device 100 at locations that have a functional relationship with the linear motion of the "copy" point 102. As an example, the guide element or guide roller may be placed on the piston lever-link-bar 110 at the junction 126 with the force-link bar 114. In this embodiment, the curved or non-linear guide channel can guide the lateral movement of the piston lever-link-bar 110 so that the piston lever-link-bar 110 activates the inner piston portion 220. The rotary joint 102 between the piston lever-link-bar 110 and the piston stem 230 makes a linear longitudinal movement aligned with the cylinder axis 250 when the piston lever-link-bar 110 and the piston stem 230 are oscillating to make a stroke movement. ing.

In certain embodiments, there is a functional relationship between a particular location on the linkage assembly and the "copy" point 102. For example, this functional relationship may include moving a particular location on the linkage assembly and, as a result, moving the "copy" point 102 accordingly. Furthermore, functional relationships can include relationships that move a particular location on the linkage assembly in either a linear or non-linear state, thus moving the "copy" point 102 in a linear state. is there. In certain embodiments, the particular location on the linkage assembly may include the "origin" point 106. Thus, the guide element or guide roller 130 can be incorporated into the quadruped rotation mechanism at a particular location to provide linear motion to the "copying" point 102, as will be appreciated by those skilled in the art.

In certain embodiments, it is preferable to have a spring device (not shown) installed or mounted anywhere on the piston-train. For example, a spring device that should be perpendicular to the hinge joint 122 (the hinge joint between the second end of the fulcrum-link bar 112 and the first end of the portion 111 of the piston lever-link-bar 110). Can constrain or guide the lateral movement of the piston lever-link-bar 110. Lateral motion is defined as motion that is not substantially aligned with the cylinder axis 250. The spring may be any type of spring device as will be appreciated by those skilled in the art. Further, the spring may have one end fixed to the engine block and the other end fixed to the piston-train. As a modification, the spring may be fixed only to the engine block. The spring may be urged to constrain or reduce the lateral movement of the fulcrum-link bar 112 so that the piston stem 230 remains within a tolerance limit substantially aligned with the cylinder axis 250.

Referring to FIG. 2, a cross-sectional view of a differential stroke engine incorporating the control / guidance device 100 according to one or more embodiments of the present invention is shown as viewed perpendicular to the rotation axis of the crankshaft. There is. The differential stroke piston moves within the fixed cylinder 212 between the fixed cylinder head 16 located above and the rotating crankshaft 18 located below when viewed in the orientation of the engine shown in FIG. The supply of air to the cylinder 212 and the exhaust of the cylinder 212 are controlled by the intake valve 17a and the exhaust valve 17b, respectively. Combustion is initiated by the spark plug 20 in the cylinder head 16 (not used in diesel applications). The engine 210 can be operated to complete one full combustion cycle per engine revolution.

The differential stroke piston is connected to the crankshaft 18 by an inner piston portion 220 and connecting rod 22 that closes and seals the combustion chamber (combustion chamber) and during some portion of the cycle the inner piston portion. It has an outer piston portion 231 that serves as a carrier for the 220. In the embodiments disclosed herein, the inner piston portion 220 operates in four strokes per cycle and the outer piston portion 231 operates in two strokes per cycle. The inner piston portion 220 and the outer piston portion 231 are separated from each other between the exhaust portion and the intake portion of the cycle. During the separation, the inner piston portion 220 is actuated and driven by the control / guidance device 100 described in FIG. As shown, in certain embodiments, the guide device 100 is preferably located outside the cylinder and cylinder bore 212 and positioned away from the movement of the piston portion and engine shaft. On the other hand, the outer piston portion 231 continues to move under the control of the crank arm 24 and the connecting rod 22.

In certain embodiments, actuators (robot arm devices) that can operate independently of the engine shaft (eg, crankshaft) define or optimize the piston stroke during the performance of different thermal functions of the engine. The optimum piston stroke combination should be provided to adapt to changing load conditions during engine operation. The actuator is not equipped with other engine components such as associated electronic or mechanical camless valve trains such as cams and is preferably synchronized with a valve train system operated by electronics. Actuators and other engine components should be controlled and optimized by the engine electronic control unit. In other embodiments, the actuator is preferably a linear actuator. In certain embodiments, the actuator may consist of an electromechanical actuator or any device that performs electrical operation by using a moving component or an actuator tongue that moves substantially linearly. The electromechanical actuator is preferably controlled by the engine electronic control unit. In other embodiments, the actuator may be controlled by a hydraulic, mechanical or electromechanical system or component.

In one embodiment, the piston lever is a guide element that moves in a curved guide when the piston lever turns around Fulcrum and guides the lever movement at the piston stem joint so that it is linear along the cylinder axis. It is provided in. In another embodiment, a linear robot device that acts on a lever using the pantograph principle is provided. The movement of the piston lever or robot arm at the piston stem junction is in the linear length direction along the cylinder axis, whereas the movement away from the cylinder axis is in the direction parallel to and perpendicular to the cylinder axis. There are two directions.

FIG. 3 shows an embodiment of a curved guide type linear actuator mechanism. A two-part piston having a first piston portion 220 and a second piston portion 222 is shown. The linkage assembly constitutes a three-dimensional rotation mechanism including a piston lever-link-bar 111, a fulcrum-link bar 112, and a force-link bar 114. The three-bar rotation mechanism is a first hinge joint 120 (eg, a fixation point), a full clam-link that is rotatably coupled to the engine block 210 and connects the first end of the full clam-link bar 112. A second hinge junction 122 connecting the second end of the bar 112 and the first end of the piston lever-link-bar 111, the linear actuator 240 and the first end of the force-link bar 114. Consists of a third hinge joint 124 connecting the two, and a fourth hinge joint 126 connecting the second end of the force-link bar 114 with a location on the piston lever-link-bar 111. It is positioned as well as being. The linear actuator tongue 240 (accommodated in the actuator device 242) is preferably rotatably attached to the force-link bar 114 via the pin 124. The guide element 130 is housed in a curved guide device 340 integrally formed with or fastened to the engine block 210. The guide element 130 is preferably coupled at pin 126.

When the first piston portion 220 is moving in a linear longitudinal direction within the cylinder 212, the fulcrum-link bar 112 moves toward and away from the cylinder axis 250 around the pivot mount 120 on the engine block 210. It swings in an arc. The force-link bar 114 and the guide element 130 move in multiple dimensions (eg, in a curved state) to compensate for the piston lever movement. In this way, the linear actuator tongue 240 preferably controls the motion of the lever 110 so as to determine a substantially linear motion of the copying point 102 along the cylinder axis 250. The relationship between the bending motion of the guide element 130 and the linear motion of the copying point 102 can be correlated and calculated by a computer or an engine electronic control unit. The axis of the linear actuator need not be parallel to the cylinder axis 250.

4 and 5 show a linear relationship embodiment embodied by the pantograph guide linear actuator mechanism. The pantograph includes a four-node rotation mechanism of the linkage bars 111, 112, 114, 118, and the lever bar consists of one of the linkage bar 111 and its extension 110. The force-linkage bar 114 preferably has two compartments divided by its junction with the linear actuator at reference numeral 106. The force applied between the joints 106 and 126 should be greater than the force applied between the joints 106 and 124. Lightly loaded compartments 106-124 are preferably included in the linear actuator tongue 240. The linkage-bar 118 should be equally lightly loaded, the linkage-bar 118 is configured to perform a guiding function, and the linkage-bar 118 is similarly thin to fit into the actuator tongue. It is good to be made. The linear actuator tongue 240 is preferably attached to the force-linkage bar at origin 106 of the pantograph. The functional relationship between the linear motion of the robot actuator and the desired motion of the stroke of the inner piston 220 can be determined by multiplying by a constant. The axis of the linear actuator tongue portion 240 is preferably parallel to the cylinder axis 250.

In certain embodiments, the variable stroke reciprocating internal combustion engine has pistons configured to reciprocate within a cylinder chamber comprising an engine shaft and an axis, each piston. It has a first piston portion, the first piston portion being aligned with or separate from the second piston portion to define the piston strokes for the different thermal functions of the internal combustion engine. An internal combustion engine of the form that is designed to move in is having an assembly rotatably coupled to a first piston portion at a copying point and an actuator coupled to this assembly. The actuator can operate to control the movement of the assembly to determine a substantially linear motion of the copying point along the cylinder chamber axis. The assembly should be coupled to the internal combustion engine at the anchorage point. The actuator is preferably composed of a linear actuator. The assembly constitutes a four-bar rotation mechanism including a piston lever-link-bar, fulcrum-link bar, force-link bar and rocker-link bar. The four-bar rotation mechanism is a first hinge joint, the full crumb, which connects the first end of the full crumb-link bar and the end of the rocker-link bar while rotatably coupled to the internal combustion engine. A second hinge joint connecting the second end of the link bar with the first end of the piston lever-link-bar, the second end of the rocker-link bar and the force-link bar second. Consists of a third hinge joint connecting the ends of one and a fourth hinge joint connecting the second end of the force-link bar and the location on the piston lever-link-bar. It is positioned as well as being. The quadruped rotation mechanism forms a parallelogram forming a pantograph, and the joint between the actuator and the quadruple rotation mechanism is positioned along a line defined between the copying point and the fixing point.

Alternatively, such an assembly constitutes a three-bar rotation mechanism including a piston lever-link-bar, a fulcrum-link bar, and a force-link bar. The three-bar rotation mechanism is rotatably coupled to the internal combustion engine with a first hinge joint connecting the first end of the full clam-link bar, and a second end of the full clam-link bar. A second hinge joint connecting the first end of the piston lever-link-bar, a third hinge joint connecting the linear actuator and the first end of the force-link bar, and It is composed and positioned by a fourth hinge joint that connects the second end of the force-link bar to the location on the piston lever-link-bar. The guide element can move in a curved guide that is configured in the internal combustion engine and coupled to a three-bar rotation mechanism, in which the first piston portion moves in a linear length direction in the cylinder. It moves in an arc when it is. The actuator consists of an electromechanical actuator that can operate independently of the engine shaft. An electronic engine control unit is used to actuate electromechanical actuators.

A method of operating a variable stroke reciprocating internal combustion engine, the internal combustion engine having pistons configured to reciprocate in a cylinder chamber provided with an engine shaft and axis, each piston being a first piston. It has a portion and the first piston portion operates to move in accordance with the second piston portion or separately from the second piston portion so as to define the piston strokes for different thermal functions of the internal combustion engine. Possible forms of method are the step of preparing the assembly rotatably coupled to the first piston portion at the copying point and the actuator coupled to the assembly, and the movement of the assembly by activating the actuator. Includes a step of controlling and thereby defining a substantially linear motion of the copying point along the cylinder chamber axis. The method further comprises the step of activating the electromechanical actuator. The method further comprises the step of actuating the actuator by an electronic engine control unit. The method further comprises stepping the actuator in a substantially linear direction. The method further comprises the step of operating the assembly independently of the engine shaft.

The method further includes the step of preparing a guide element that is configured in the internal combustion engine and can move in a curved guide coupled to the assembly at a first location that has a functional relationship with the copying point. The method further includes moving the guide element in a multidimensional direction in the curved guide, and correspondingly moving the first piston portion in the cylinder substantially along the cylinder chamber axis. This method further includes the step of constructing a pantograph device in the assembly, the pantograph device defines a one-to-one scale change relationship between the origin and the copying point, and this method operates a linear actuator to operate the origin. Further includes the step of moving the copy point over the first straight line distance and the copying point over the second straight line distance, and the second straight line distance is an amount scaled with respect to the first straight line distance. The method further comprises the step of activating a pantograph device constituting a quadruped rotation mechanism including a piston lever-link-bar, fulcrum-link bar, force-link bar, and rocker-link bar.

Advantageously, in the embodiments disclosed herein, the movement of the inner piston portion is guided at the inner end of the chamber by a piston crown that slides along the cylinder wall and by a guide device at the outer end of the piston stem. By the way, there is provided a control / guidance device that is guided so that a motion substantially along the cylinder axis can be obtained. In view of the guide device, especially the guide element that can move within and along the axis of the guide channel, the inner piston portion is in a state where there is virtually no lateral movement of the piston stem and the piston lever-link-. It can move up and down with virtually no lateral thrust from the bar to the piston stem. Therefore, the stress and wear applied to the inner piston portion and the cylinder wall caused by the lateral movement of the piston can be reduced. The guide device can also reduce the sliding friction and "slapping" of the inner piston portion with respect to the cylinder wall.

Moreover, the space required for the quadruple rotation mechanism assembly inside the engine itself is relatively small (as shown in FIG. 2). Furthermore, the four-node rotating mechanism, which acts as a pantograph assembly, can move the piston stem and inner piston portion by much more than is required to move the guide element within the guide channel.

When we say "one embodiment" or "an embodiment" or "a particular embodiment" throughout the specification, this means that the particular features, structures or properties described in connection with that embodiment It is meant to be included in at least one embodiment of the present invention. Thus, even though the phrases "in one embodiment" or "in certain embodiments" appear in various places throughout the specification, they all necessarily refer to the embodiments described above. However, there are cases where this is the case. Further, as will be apparent to those skilled in the art from this disclosure, certain features, structures or properties may be combined in any suitable manner in one or more embodiments.

In the original claims and the original specification, it is referred to as "comprising" (often referred to as "having" in the Japanese translation), "comprised of" ("consisting of") or "comprises". Each term is an open claim (non-limiting) term that means that it contains at least the following elements / features, but does not exclude others. Therefore, the term "comprising", when used in the claims, should not be construed as being limited to the means, elements or steps listed after the term. The terms "including" (often referred to as "having" in the Japanese translation), or "include" or "includes" as used herein are also at least the elements that follow / An open claim term (non-limiting) term that includes features but does not exclude others. Therefore, "including" is synonymous with "comprising" and means "comprising".

It should be understood that the term "combined" should not be construed as being limited to direct relevance when used in the claims. The term "combined" means that two or more elements are in a direct physical relationship or two or more elements are not in direct contact with each other but still cooperate with each other. Or it may mean either interacting.

Although one or more embodiments of the present invention have been described in detail, many take various specific embodiments and reflect modifications, substitutions and modifications without departing from the spirit and scope of the invention. It will be apparent to those skilled in the art that an embodiment can be conceived. The described embodiments exemplify the invention described in the claims, but do not limit the scope of the invention described in the claims.

16 Fixed Cylinder Head 18 Rotating Crankshaft 100 Piston-Train Guide or Assembly 102 Copy Point 104 Sticking Point 106 Origin 111, 112, 114, 118 Linkage Bar 120, 122, 124, 126 Hinge Joint 126 Pin 130 Guide Element 210 Engine block 212 Cylinder bore 220 First or inner piston part 222 Second piston part 230 Piston stem 231 Outer piston part 240 Linear actuator 250 Cylinder axis 340 Crankshaft

Claims (14)

A variable stroke reciprocating internal engine, said internal engine having pistons configured to reciprocate in a cylinder chamber comprising an engine shaft and an axis, each piston having a first piston portion. The first piston portion, however, moves consistently with or separately from the second piston portion to define piston strokes for different thermal functions of the internal combustion engine, said internal combustion. The engine is
With the assembly rotatably coupled to the first piston portion at the copying point,
With an actuator coupled to the assembly
The actuator can be actuated to control the movement of the assembly to determine a substantially linear motion of the copying point along the cylinder chamber axis.
The assembly is an internal combustion engine that constitutes a three-bar rotation mechanism including a piston lever-link-bar, a fulcrum-link bar, and a force-link bar. The internal combustion engine according to claim 1, wherein the assembly is coupled to the internal combustion engine at a fixing point. The internal combustion engine according to claim 1, wherein the actuator is a linear actuator. The three-section rotation mechanism
A first hinge joint that connects the first end of the fulcrum-link bar while rotatably coupled to the internal combustion engine.
A second hinge joint connecting the second end of the fulcrum-link bar and the first end of the piston lever-link-bar,
A third hinge joint connecting the actuator to the first end of the force-link bar, and a location on the piston lever-link-bar with the second end of the force-link bar. The internal combustion engine according to claim 1, wherein the internal combustion engine is configured and positioned by a fourth hinge joint that is connected. It further has a guide element that is configured in the internal combustion engine and can move in a curved guide coupled to the three-node rotation mechanism, and the movement of the guide element is such that the movement of the copying point is substantially linear. The internal combustion engine according to claim 1, which is defined by an arc while being in a state. The internal combustion engine according to claim 1, wherein the actuator comprises an electromechanical actuator that can operate independently of the engine shaft. The internal combustion engine according to claim 6, further comprising an electronic engine control unit for operating the electromechanical actuator. A method of operating a variable stroke reciprocating internal combustion engine, wherein the internal combustion engine has pistons configured to reciprocate in a cylinder chamber provided with an engine shaft and an axis, and each piston is a first. Having a piston portion, said first piston portion coincides with or separately from the second piston portion to define piston strokes for different thermal functions of the internal combustion engine. Operable to move, the method comprises the step of preparing an assembly rotatably coupled to the first piston portion at the copying point and an actuator coupled to the assembly.
Including the step of activating the actuator to control the movement of the assembly, thereby defining a substantially linear motion of the copying point along the cylinder chamber axis.
The method, wherein the assembly comprises a three-bar rotation mechanism including a piston lever-link-bar, a fulcrum-link bar, and a force-link bar. The actuator consists of an electromechanical actuator The method of claim 8. 8. The method of claim 8, further comprising the step of activating the actuator by an electronic engine control unit. 8. The method of claim 8, further comprising stepping the actuator in a substantially linear direction. 8. The method of claim 8, further comprising stepping the assembly into operation independently of the engine shaft. A claim further comprising the step of preparing a guide element that is configured in the internal combustion engine and can move in a curved guide coupled to the assembly at a first location that has a functional relationship with the copy point. Item 8. The method according to item 8. A step of moving the guide element in a multidimensional direction in the curved guide,
13. The method of claim 13, further comprising the step of defining a substantially linear motion of the copying point along the cylinder chamber axis accordingly.

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