EP3458682A1 - Freikolbenvorrichtung und verfahren zum betreiben einer freikolbenvorrichtung - Google Patents
Freikolbenvorrichtung und verfahren zum betreiben einer freikolbenvorrichtungInfo
- Publication number
- EP3458682A1 EP3458682A1 EP17723378.0A EP17723378A EP3458682A1 EP 3458682 A1 EP3458682 A1 EP 3458682A1 EP 17723378 A EP17723378 A EP 17723378A EP 3458682 A1 EP3458682 A1 EP 3458682A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- opening
- free
- piston device
- bottom dead
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B11/00—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type
- F01B11/007—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type in which the movement in only one direction is obtained by a single acting piston motor, e.g. with actuation in the other direction by spring means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B11/00—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type
- F01B11/02—Equalising or cushioning devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B7/00—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
- F01B7/02—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders with oppositely reciprocating pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
-
- 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
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
- F02B63/041—Linear electric generators
-
- 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
- F02B71/00—Free-piston engines; Engines without rotary main shaft
-
- 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
- F02B71/00—Free-piston engines; Engines without rotary main shaft
- F02B71/04—Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby
-
- 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
- F02B75/28—Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
-
- 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
- F02B75/28—Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
- F02B75/282—Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders the pistons having equal strokes
-
- 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
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Definitions
- the invention relates to a free-piston device, comprising a piston receptacle, in which at least one piston device with a piston is linearly reciprocatingly arranged, wherein the piston receptacle comprises a wall bounded by a combustion chamber or forms, in the at least one first opening and at least one second opening are formed, which openings at least one inlet opening for the supply of fresh gas and, spaced in the direction of movement of the piston means thereof, at least one outlet opening for the removal of exhaust gas for a longitudinal purge of the combustion chamber, wherein the movement of the at least one piston means is controllable by means of a control device.
- the invention relates to a method for operating such a free-piston device.
- DE 10 2008 053 069 A1 describes a free-piston device with two piston devices and pistons positioned in an opposing piston arrangement.
- the piston of the first piston device releases at the bottom dead center an inlet opening and an outlet opening for a transverse flushing of the combustion chamber.
- the second piston device can be operated such that the second piston selectively releases or obstructs an outlet opening axially spaced from the above-mentioned openings, when the piston of the second piston device assumes the bottom dead center.
- a longitudinal flushing of the combustion chamber can thereby be carried out depending on the load.
- Object of the present invention is to provide a free-piston device of the type mentioned and a method for operating such a free-piston device, in which or an operating point of the free-piston device is more versatile adjustable.
- a generic free-piston device in that the piston is at least partially movable over the at least one first opening and that the bottom dead center of the piston is adjustable, wherein the at least one first opening when taking the bottom dead center partially released by the piston and partially obstructed is for adjusting a free cross-sectional area of the at least one first opening and / or that an opening period is adjustable during which the piston at least partially releases the at least one first opening when passing through the bottom dead center, while maintaining the position of the bottom dead center ,
- the free-piston device it is possible to influence the flushing process for the combustion chamber during the charge exchange.
- the amount of fresh gas or dischargeable exhaust gas that can be supplied via the at least one first opening can be adjusted by controlling the movement of the piston device by the control device during operation of the free piston device.
- the adjustment of the amount of fresh gas and / or exhaust gas constructively simply by the fact that the bottom dead center of the piston is chosen so that the at least one first opening partially released to release a desired opening cross-section and otherwise partially blocked.
- more or less fresh gas or exhaust gas can flow through the at least one first opening.
- This can be achieved according to the invention as an alternative or in addition also by the fact that the movement of the piston device is controlled in operation in such a way that the opening duration is set, during which the at least one first opening - - tion is fully or at least partially released, the position of the bottom dead center of the piston is not changed relative to the piston itself. Accordingly, it is possible to set the time required for the piston to pass through the bottom dead center, thereby influencing the duration during which the fresh gas can flow into the combustion chamber or exhaust gas can be removed from the combustion chamber.
- the solution according to the invention makes it possible to influence the flushing process for the combustion chamber, whereby a versatile operation of the free-piston device is possible.
- the ratio of fresh gas and exhaust gas can be adjusted with regard to optimized combustion.
- from an operation with low residual gas content (much fresh gas and low exhaust gas) with spark ignition to an operation with high residual gas content (lower amount of fresh gas and higher proportion of exhaust gas) are switched with auto-ignition. This is preferably possible cycle-individually, for each cycle of the piston device.
- a smaller residual gas content (about 5% or less) remains in the combustion chamber, when passing through the bottom dead center of the piston for the subsequent cycle, the charge exchange can be carried out so that a comparatively high proportion of residual gas (about 50%) is provided so that immediately after a self-ignition is possible, and vice versa.
- a low residual gas content (approximately less than 5%) nor a high residual gas content is present and which are energetically unfavorable can be avoided.
- the opening duration of the at least one opening it is possible to control the charge pressure and thus also the temperature in the combustion chamber, for example, at a constant frequency of the free piston device.
- About the boost pressure can be, for example, with the same filling of the combustion chamber, preferably control flow conditions in the combustion chamber such as turbulence, spin and tumble.
- the time of the charge exchange over the opening duration of the at least one inlet opening or outlet opening and / or over the releasable cross-sectional area.
- the charge change can be adjusted in particular depending on the frequency of the free-piston device, the desired charge pressure, the residual gas content, the ignition variant (external or auto-ignition), the desired load and / or the flow ratio (turbulence, spin, tumble ).
- control or “control” is to be construed as meaning alternatively or additionally also “regulation” or “regulation”.
- “Control” is therefore to be understood in this case as “control and / or regulation”.
- fresh gas is understood as meaning a gas or gas mixture (in particular air) for the internal combustion in the combustion chamber, it also being possible for a fuel to be admixed with the gas or gas mixture.
- fresh gas can therefore also denote a gas-fuel mixture which can flow into the combustion chamber via the at least one inlet opening.
- exhaust herein refers to a combustion product of internal combustion.
- a supply line for fresh gas or a discharge line for exhaust gas is connected or connectable to the at least one inlet opening and the at least one outlet opening.
- the at least one first opening and the at least one second opening in the wall are configured, for example, slit-shaped.
- first opening for example, a plurality of first openings which are formed in the circumferential direction of an axis of the piston device in the wall.
- second opening of which a plurality may be present.
- the at least one first opening can be completely released when taking the bottom dead center by the piston. As a result, the amount of incoming fresh gas or exhaust gas flowing out can be maximized.
- the at least one inlet opening, along the direction of movement of the piston device, spaced from each outlet opening can be understood in particular as meaning that there is no outlet opening transversely to the direction of movement of the piston device of a respective inlet opening and accordingly no transverse flushing of the combustion chamber is undertaken. Instead, there is only a longitudinal rinse on the along the direction of movement spaced apart inlet. Outlet ports.
- the free piston device preferably comprises an energy coupling device coupled to the control device, wherein the movement of the at least one piston device is controllable by the control device via the energy coupling device.
- the control device can control the energy coupling device for controlling the movement of the piston device.
- the energy coupling device in particular comprises a linear generator.
- the linear generator may comprise a rotor arrangement fixed to the piston device and a stator arrangement fixed to the piston receiver. Runner arrangement and
- Stator arrangement comprise in particular magnets or coils.
- the free piston device comprises a return spring device coupled to the control device for the at least one piston device.
- the return spring device can be controlled by the control device for controlling the movement of the at least one piston device.
- the return spring device is or in particular comprises a gas spring.
- the hardness of the gas spring can, also in operation, by means of the control device preferably by the supply of gas or the removal of gas a - - be asked.
- a mechanical return spring device can be provided as the return spring device.
- the at least one first opening is an inlet opening and the at least one second opening is an outlet opening.
- the at least one first opening is an outlet opening and the at least one second opening is an inlet opening.
- An advantageous embodiment of the free-piston device provides (exactly) a piston device, wherein at least one controllable by the control valve for releasing or blocking the at least one second opening is arranged at the at least one second opening.
- the piston of a piston device releases the at least one first opening at bottom dead center at least partially and / or the opening duration of the at least one first opening is adjustable as explained above.
- Via the at least one valve at the second opening the at least one second opening can be released via the control device and thereby the charge exchange can be carried out.
- the at least one second opening is arranged, for example, on the front side on the wall of the combustion chamber and lies opposite a piston surface of the piston.
- the free-piston device comprises a further piston device with a piston which is linearly reciprocatingly arranged in the piston holder, wherein the pistons of both piston devices are positioned in opposing piston arrangement and the combustion chamber formed between the pistons is.
- the piston of the further piston device is at least partially movable over at least one further opening of the wall, and the amount of exhaust gas or feedable fresh gas which can be discharged via the at least one further opening can be controlled by the movement of the further piston device during operation of the control device.
- influence can be made on the flushing process and the charge change in the present embodiment.
- the amount of exhaust gas discharged via the at least one further opening or supplied fresh gas can be influenced by the control device controlling the movement of the second piston device as well.
- the at least one further opening is in particular and advantageously the at least one second opening.
- the control of the movements of the piston devices may be such that via a respective piston, the amount of fresh gas via the at least one first or exhaust gas via the at least one second opening during operation of the free-piston device is adjustable.
- the at least one further opening is at least one first opening, the at least one second opening being positioned along the direction of movement of the piston devices between the first openings.
- At the at least one second opening for example, a controllable by the control valve is provided.
- the bottom dead center of the piston of the further piston device is adjustable, wherein the at least one further opening partially freed when taking the bottom dead center by the piston and is partially blocked for setting a free cross-sectional area of the at least one further opening.
- the amount of supplyable fresh gas or exhaust gas can be adjusted as in the free-piston device according to the invention.
- an opening duration is adjustable, during which the piston of the further piston device at least partially releases the at least one further opening when passing through the bottom dead center, even while maintaining the position of the bottom dead center.
- the movement of the further piston device can be controlled such that the time for passing through the bottom dead center of the further piston is set to adjust the amount of deliverable fresh gas or purgeable exhaust gas.
- a same stroke of both piston devices is adjustable.
- the movement of both piston devices is antisymmetric controllable to each other.
- the free-piston device preferably comprises a return spring device for the further piston device.
- the movement of the further piston device can also be controlled.
- at least one further piston device is associated with a return spring device and / or energy coupling device coupled to the control device, wherein the movement of the at least one further piston device is controllable via the return spring device and / or the energy coupling device, wherein the energy coupling device preferably comprises a linear generator.
- the free piston device may comprise a return spring device and / or an energy coupling device for controlling a respective piston device.
- the at least one first opening and the at least one second opening are arranged symmetrically to one another on the piston receptacle and / or configured. This is particularly advantageous for the same stroke and anti-symmetrical movement of the piston devices. - -
- the present invention also relates to a method for operating a free-piston device, comprising a piston receptacle, in which at least one piston device with a piston is linearly reciprocatingly arranged, wherein the piston receptacle comprises a wall bounded by a combustion chamber or forms, in the at least one first opening and at least one second opening are formed, which openings at least one inlet opening for the supply of fresh gas and, spaced in the direction of movement of the piston means, at least one outlet opening for the discharge of exhaust gas for a longitudinal purge of the combustion chamber, wherein the movement of at least one piston device is controlled by means of a control device.
- the object mentioned in the present invention is achieved in that the piston is at least partially moved over the at least one first opening and that the bottom dead center of the piston is adjusted, wherein the at least one first opening when taking the bottom dead center by the piston is partially released and partially blocked for adjusting a free cross-sectional area of the at least one first opening and / or that an opening period is set during which the piston, the at least one first opening when passing through the bottom dead center, while maintaining the position of the bottom dead center, at least partially releases.
- advantageous embodiments of the method according to the invention result from advantageous embodiments of the device according to the invention. Also in this regard, reference may be made to the above statements. - -
- the method according to the invention permits, during operation of the free-piston device, to set the flushing process and thus the charge cycle.
- the boost pressure and thus the temperature in the combustion chamber is adjustable.
- the flow conditions such as turbulence, spin and tumble can be controlled.
- a transition from an operation with spark ignition at low residual gas content to an operation with auto-ignition at high residual gas content and vice versa is feasible cycle-individually.
- Figure 1 a schematic representation of a free piston device according to the invention
- Figure 2 an enlarged view of detail A in Figure 1, wherein two
- Piston of the free piston device occupy a respective bottom dead center
- FIG. 3 a representation corresponding to FIG. 2, the pistons being in the
- FIG. 4 shows a representation corresponding to FIG. 2, wherein the free-piston device has a different operating point and the pistons assume a different bottom dead center;
- FIG. 5 is a view corresponding to FIG. 4, wherein the pistons are in the
- FIG. 6 shows a partial view of a further preferred embodiment of a free-piston device whose piston assumes a bottom dead center;
- Figure 7 is a view corresponding to Figure 6, wherein the free-piston device is operated at a different operating point and the piston occupies a different bottom dead center;
- FIG. 8 shows schematically a piston position as a function of time for a free-piston device according to the invention, which is operated with two different operating points in which different times for the charge exchange are achieved.
- Figure 1 shows an occupied by the reference numeral 10 advantageous embodiment of a free piston device according to the invention, which in particular forms a free-piston engine 12.
- the free piston device 10 comprises a housing 14 forming a piston seat 16.
- two piston means 18, 20 along a common axis defined by them 22 arranged linearly back and forth.
- a respective piston device 18, 20 comprises a piston 24 or 26, a piston rod 28 or 30 and an opposing piston 32 or 34.
- the piston devices 18, 20 and thus the pistons 24, 26 are positioned in opposed piston arrangement, wherein piston surfaces 36 of the piston 24, 26 face each other.
- the piston receptacle 16 comprises a combustion chamber 40 delimited by a wall 38 of the housing 14.
- the combustion chamber 40 is variable in size as a result of the opposite movement of the piston devices 18, 20 and is formed between the piston surfaces 36.
- first openings 42 and second openings 44 are formed in the wall 38. In each case, two first or two second openings 42, 44 are present - -, but the number could be different.
- the openings 42, 44 are configured, for example, as slots in the wall 38.
- the first openings 42 are inlet openings 46. Via the inlet openings 46, fresh gas can flow into the combustion chamber 40 during the charge cycle.
- To the wall 38 may be connected in the drawing, not shown inlet lines, which open via the inlet openings 46 into the combustion chamber 40.
- the second openings 44 are outlet openings 48. Exhaust gas can be removed from the combustion chamber 40 via the outlet openings 48 during the charge cycle. At the outlet openings 48 outlet pipes not shown in the drawing may be connected to the wall 38, wherein the combustion chamber 40 opens via the outlet openings 48 in the outlet ducts.
- the inlet openings 46 are arranged symmetrically to the outlet openings 48 on the piston receptacle 16 and can preferably be configured identically to these.
- the inlet openings 46 are assigned to the piston device 18 and in particular to the piston 24 thereof.
- the piston 24 forms a valve body for closing and releasing the inlet openings 46.
- the piston 24 releases the inlet openings at bottom dead center completely or partially, and the opening duration of the inlet openings 46 can be adjusted.
- the outlet openings 48 are assigned to the piston device 20 and in particular to its piston 26.
- the piston 26 forms a valve body for closing and releasing the outlet openings 48.
- the piston 26 releases the outlet openings completely or partially, and the opening duration of the outlet openings 48 can be adjusted.
- the piston devices 18, 20 are favorably designed identically.
- the free-piston device 10 has the piston device 18 associated with a return spring means 50, which is preferably designed as a gas spring 52.
- a resilience space 54 is formed with gas received therein.
- the piston device 18 moves under compression of the gas in the resilience space 54.
- the piston device 18 is moved in the opposite direction.
- a return spring device 56 configured as a gas spring 58, is provided for the piston device 20, with a return spring space 60 formed in the piston receptacle 16.
- the free-piston device 10 has an energy coupling device 62 assigned to the piston device 18, configured here as a linear generator 64.
- the linear generator 64 comprises a rotor arrangement 66 on the piston rod 28 and a stator arrangement 68 on the piston receptacle 16.
- the free-piston device 10 comprises, associated with the piston device 20, an energy coupling device 70 configured as a linear generator 72.
- the linear generator 72 comprises a rotor arrangement 74 on the piston rod 30 and a stator arrangement 76 on the piston receptacle 16.
- the free-piston device 10 has a control device 78.
- the control device 78 is, schematically represented via control lines 79 and 80, coupled to the return spring device 50 and the return spring device 56.
- the spring force of the gas springs 52, 58 can be adjusted by means of the control device 78 for controlling the movement of the piston device 18, 20 in operation. - -
- control lines 81 and 82 show schematically the coupling of the control device 78 with the linear generators 64 and 72, respectively.
- control in the present case also includes in particular "regulating”.
- an ignition device 84 may be provided which can be controlled by the control device 78 via a control line 86.
- an injection device not shown in the drawing can be provided on the combustion chamber 40, likewise controllable by the control device 78.
- a fuel can be introduced into the combustion chamber 40 via the injection device.
- the "fresh gas" which can be supplied via the inlet openings 46 can be a gas-fuel mixture of gas or gas mixture with admixed fuel.
- the free-piston device 10 is operated in two-stroke operation, in which the piston devices 18, 20 are moved antisymmetrically to each other.
- the compressed in the combustion chamber 40 gas-fuel mixture is ignited by means of the ignition device 84 or by auto-ignition, whereby the piston means 18, 20 are driven apart.
- the inlet openings 46 and the outlet openings 48 are at least partially released as explained below.
- Both pistons 24, 26 pass through a respective top dead center OT and a respective bottom dead center UT. - -
- the amount of fresh gas that can flow into the combustion chamber 40 via the inlet openings 46 during the charge exchange can be controlled by the movement of the piston device 18, and / or the amount of exhaust gas that is transferred during the charge cycle Outlet openings 48 can flow out of the combustion chamber 40.
- the piston 24 acts as a valve body for the inlet openings 46 and is at least partially movable over them.
- the control device 78 can adjust the movement of the piston device 18 to assume a predefinable bottom dead center UT. This is shown by way of example in FIG. 2, the position of the bottom dead center being identified as UTl.
- the inlet openings 46 in the example of FIG. 2 are partially opened and partially blocked by the piston 24.
- the free cross-sectional area for controlling the amount of fresh gas flowing in during the charge exchange can thereby be adjusted.
- the movement of the piston device 20 can advantageously be controlled in the free piston device 10 in a corresponding manner so that the outlet openings 48 are fully or partially released from the piston 26.
- the example of FIG. 2 shows that the piston 26, which also forms a valve body for the outlet openings 48, assumes a bottom dead center UTI '. The outlet openings 48 are partially released from the piston 26 and otherwise blocked.
- the movement can be controlled such that the free cross-sectional area of the outlet openings 48 is adjusted in order to control the amount of exhaust gas discharged during the charge exchange and rinsing process.
- FIG. 4 shows, by way of example, how the movements of the piston devices 18, 20 can be differently controlled to assume a different operating point of the free-piston device 10.
- the movement of the piston device 18 is controlled such that its piston 24 completely releases the inlet openings 46 when taking the bottom dead center UT2.
- the amount of fresh gas flowing in during the charge exchange is greater than in the example shown in FIG. 2, because the free cross-sectional area of the inlet openings 46 is larger and in particular maximized.
- the movement of the piston means 20 is controlled so that the outlet openings 48 are fully released when the piston 26 reaches the bottom dead center UT2 '. Due to the larger cross-sectional area than in the example shown in Figure 2, the amount of exhaust gas discharged at the charge exchange is greater than when the piston 26, as explained above, the bottom dead center UT1 'occupies.
- FIGS. 3 and 5 illustrate schematically how different residual gas contents are present after the flushing process in the combustion chamber 40 during the upward movement of the pistons 24, 26.
- Fresh gas is represented in FIGS. 3 and 5 by open circles 88 and residual gas by black dots 90.
- the content of residual gas in the combustion chamber 40 is greater than at the example of Figure 4, in which the inlet openings 46 and 48 are fully open.
- the boost pressure in the combustion chamber 40 so that its temperature and due to the boost pressure, the flow ratio such as turbulence, spin or tumble are varied in the combustion chamber 40.
- FIGS. 6 and 7 show a partial representation of a further free-piston device according to the invention, designated by the reference numeral 100.
- the free-piston device 100 differs from the free-piston device 10 in that only one piston device 18 is provided.
- the wall 38 is closed on the piston surface 36 opposite side of the piston 24 and has an end wall 102 in this area.
- the outlet openings 48 are formed in the end wall 102.
- a controllable by the controller 78 valve 104 is assigned.
- Figures 6 and 7 do not show the return spring device 50 and the energy coupling device 62, but these are also provided in the free-piston device 100.
- the position of the bottom dead center of the piston 24 can also be adjusted in operation so that the amount of inflowing fresh gas is controlled.
- the valves 104 are opened, so that exhaust gas can be removed from the combustion chamber 40.
- the situation of Figure 6 corresponds to the example of Figure 2, and the situation of Figure 7 the example of Figure 4.
- the outlet openings 48 are completely released via the valves 104, and only the amount of inflowing fresh gas is through the Position of the respective bottom dead center UTl or UT2 of the piston 24 varies.
- the possibility is given to vary the residual gas content in the combustion chamber 40.
- an opening duration by the movement of a piston device, for which opening duration the inlet openings 46 or the outlet openings 48 are opened - - are, wherein the position of a bottom dead center of the piston is not changed.
- a first trajectory 106 is shown drawn through a piston and a second trajectory 108 is shown in phantom for the same piston.
- the piston is, for example, the piston 24 of the piston device 18, but it could also be the piston 26 of the piston device 20.
- the trajectories 106 and 108 show the piston position relative to the piston seat as a function of time.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Feeding And Controlling Fuel (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016109055.7A DE102016109055A1 (de) | 2016-05-17 | 2016-05-17 | Freikolbenvorrichtung und Verfahren zum Betreiben einer Freikolbenvorrichtung |
| PCT/EP2017/061522 WO2017198579A1 (de) | 2016-05-17 | 2017-05-12 | Freikolbenvorrichtung und verfahren zum betreiben einer freikolbenvorrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3458682A1 true EP3458682A1 (de) | 2019-03-27 |
| EP3458682B1 EP3458682B1 (de) | 2021-06-16 |
Family
ID=58707558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17723378.0A Active EP3458682B1 (de) | 2016-05-17 | 2017-05-12 | Freikolbenvorrichtung und verfahren zum betreiben einer freikolbenvorrichtung |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US10605081B2 (de) |
| EP (1) | EP3458682B1 (de) |
| CN (1) | CN109154193B (de) |
| DE (1) | DE102016109055A1 (de) |
| WO (1) | WO2017198579A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723538A (zh) * | 2018-12-20 | 2019-05-07 | 南京理工大学 | 一种自由活塞式中央燃烧室 |
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| CN114526154B (zh) * | 2022-02-10 | 2023-01-31 | 德电北斗电动汽车有限公司 | 对置活塞线性发电机组发电量输出控制系统 |
| CN116104640B (zh) * | 2023-02-16 | 2025-02-11 | 浙江吉利控股集团有限公司 | 一种自由活塞直线发电机系统及其控制方法 |
| IT202300015777A1 (it) * | 2023-07-26 | 2025-01-26 | Giovanni Mariani | Generatore lineare a pistoni liberi a due tempi |
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-
2016
- 2016-05-17 DE DE102016109055.7A patent/DE102016109055A1/de not_active Ceased
-
2017
- 2017-05-12 CN CN201780030223.4A patent/CN109154193B/zh active Active
- 2017-05-12 WO PCT/EP2017/061522 patent/WO2017198579A1/de not_active Ceased
- 2017-05-12 EP EP17723378.0A patent/EP3458682B1/de active Active
-
2018
- 2018-11-15 US US16/192,301 patent/US10605081B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109154193B (zh) | 2021-05-07 |
| US10605081B2 (en) | 2020-03-31 |
| EP3458682B1 (de) | 2021-06-16 |
| DE102016109055A1 (de) | 2017-11-23 |
| CN109154193A (zh) | 2019-01-04 |
| WO2017198579A1 (de) | 2017-11-23 |
| US20190085696A1 (en) | 2019-03-21 |
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