EP0045472A1 - Hydraulikgenerator mit einer Freikolbenmaschine - Google Patents

Hydraulikgenerator mit einer Freikolbenmaschine Download PDF

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Publication number
EP0045472A1
EP0045472A1 EP81105943A EP81105943A EP0045472A1 EP 0045472 A1 EP0045472 A1 EP 0045472A1 EP 81105943 A EP81105943 A EP 81105943A EP 81105943 A EP81105943 A EP 81105943A EP 0045472 A1 EP0045472 A1 EP 0045472A1
Authority
EP
European Patent Office
Prior art keywords
piston
free piston
engine according
hydraulic
hydraulic generator
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
Application number
EP81105943A
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English (en)
French (fr)
Other versions
EP0045472B1 (de
Inventor
Pierre Bouthors
Olivier Breting
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0045472A1 publication Critical patent/EP0045472A1/de
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Publication of EP0045472B1 publication Critical patent/EP0045472B1/de
Expired legal-status Critical Current

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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
    • 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
    • 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
    • F02B71/045—Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby with hydrostatic transmission
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
    • F04B19/003—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00 free-piston type pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/022—Stopping, starting, unloading or idling control by means of pressure
    • 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
    • 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
    • F02B71/02—Starting

Definitions

  • the invention relates to a hydraulic generator with a free piston engine with hydropneumatic return mattress and an associated piston for pumping hydraulic fluid supplying a hydraulic accumulator.
  • the object of the present invention is to enable the free piston engine to operate satisfactorily and intermittently for the charge of the accumulator, making it possible to obtain good conditions of efficiency and non-pollution.
  • the hydraulic generator according to the invention with a free piston engine with hydropneumatic return mattress and an associated piston for pumping hydraulic fluid supplying a hydraulic accumulator intended to be charged between two detected pressure levels, is characterized in that it comprises a device for locking the free piston in the neutral point of trigger expansion with voluntary control, and means for controlling this locking device to the means for detecting the two aforementioned pressure levels, in order to lock the piston in response to the detection of the aforementioned highest pressure level and to ensure its unlocking in response to the detection of the aforementioned pressure level the lowest, and thus an intermittent automatic operation of said motor o
  • the pumping is carried out via at least one differential piston, a first central part of which cooperates with the corresponding hydropneumatic return mattress which comprises a hydraulic inlet which can be closed off by said first part of the differential piston after a certain initial driving stroke of the free piston, and a pumping chamber towards the the accumulator is formed in the interval between the annular part of the differential piston surrounding said central part and the hydropneumatic mattress, which makes it possible to obtain a greater initial acceleration of the free piston working against the mattress before pumping and to reduce heat losses by the walls at the start of the cycle.
  • the pumping can be located in an intermediate fraction of the stroke of the free piston by putting the hydropneumatic mattress in communication with the pumping chamber in the final phase of the stroke of said differential piston, having an intercommunication passage formed at this point. effect.
  • the means for detecting the aforementioned lowest pressure level cooperate with reconditioning means. of the hydropneumatic mattress from the accumulator, and means are provided for delaying the actuation of the servo means of the locking or unlocking device after actuation of said reconditioning means.
  • pumping can be provided using two differential pistons constituted by weights with symmetrical and reverse movement relative to that of the free piston, these weights being actuated hydraulically by means of 'at least one transfer piston rigidly secured to the free piston.
  • the free piston can, within the framework of the aforementioned provisions, be cooled by means of an inertia piston placed in a cooling circuit supplied by the hydraulic fluid for transmitting movement or the pumping circuit.
  • the hydraulic generator represented in FIG. 1 comprises a single-cylinder free piston engine operating according to a two-stroke cycle, of which 1 is designated by the casing, 2 the cylinder head, 3 the piston, 4 a fuel injector, 5 a spark plug. 'ignition.
  • the casing constitutes in a manner known under the piston a chamber 6 for suction and compression of filling air and scanning of the cylinder supplied by a pipe 7 to an intake port 8 which, as well as an exhaust port 9, are discovered by the piston 3 in the vicinity of its detent neutral point, while an air intake port 10 in the casing is provided with a non-return valve 11.
  • the piston 3 is provided with a rod 12 passing through the casing and which is integral with a pumping piston 13 sliding along the same axis as the free piston in a hydraulic pump body 14 extended by a hydropneumatic mattress 15, with membrane 16 separating a capacity of pressurized gas 17 from the hydraulic fluid present in the mattress and pump body.
  • the pumping piston 13 is a differential piston having a part 13a of smaller diameter than its part 13b sliding in the body 14, the part 13a being intended to slide into an inlet 18 of the hydraulic enclosure 19 of the mattress hydropneumatic, after a certain amplitude of the initial driving stroke of the free piston indicated in 200
  • the part 13b of the differential piston acts as a piston for discharging the hydraulic fluid present in the pumping chamber 21, then delimited between piston 13 and mattress, and which permanently communicates with a chamber 22 provided with at least one valve.
  • suction 23 and a discharge valve 24 are placed on a conduit connected to the tank of the hydraulic circuit by a usual low pressure booster pump not shown.
  • the discharge valve 24 is connected by a conduit 25 to the hydraulic enclosure of a hydraulic pressure accumulator shown diagrammatically at 26.
  • the maximum pressure in the mattress being permanently maintained lower than the minimum pressure prevailing in the accumulator, as as will be seen later, it follows that the pumping phase towards the accumulator does not begin therefore only after the initial driving stroke 20 of the sole pressurization of the mattress.
  • the pumping phase is limited to an intermediate fraction of the total stroke amplitude 27 of the free piston, in that the part 13a of the differential pumping piston has lateral passages 28 which come to put, in the final fraction 29 of the total stroke amplitude 27, the hydropneumatic mattress 15 again in communication with the pumping chamber 21. It is also possible to give the valve chamber 22 a divergent entry 30 capable of introducing a reduction in the speed of the fluid near the valves in the effective pumping stroke.
  • the free piston 3 can be locked in the detent dead center, that is to say after the total stroke amplitude 27, by means of latches 31 cooperating with corresponding notches 32 of the piston rod 12 and subjected to an electromagnetic control comprising an electromagnet 33, the mobile assembly of which is connected by connecting rods 34, 35 to a cam 36 governing the placing in active or passive position of two sliders 37 which carry the spring-loaded latches 31 and which are mounted dovetail sliding on sup-. ports 39 provided in the housing. The slides are normally biased in the locking position by springs 40, when the electromagnet 33 is not energized.
  • Such a motor is normally stopped in the locked position in the dead center of expansion by de-excitation of the electromagnet 33. It is intended to operate intermittently in optimal or favorable conditions of efficiency for charging the hydraulic accumulator 26 between two values pressure detected by a pressure gauge 41, having an electrical contact 41a for minimum pressure detection and an electrical contact 41b for maximum pressure detection. It is of course also possible to plan to start it if necessary on demand when one is for sure largely within the range of these detected pressures.
  • An automatic start or restart command in response to the minimum pressure detection in the hydraulic accumulator 26 is illustrated as an example in FIG. 1, starting from the minimum pressure detection contact 41a, in parallel with which a contact has been shown.
  • push button 42 intended to be actuated temporarily by the user for possible activation on the aforementioned request, after having been closed a switch 43 with contact 43a for general energization of the control circuits, with contact 43b d electrical supply of the ignition circuit and of the fuel injection control which will be discussed later, this switch 43 also authorizing the possible excitation of the electromagnet 33 by its contact 43c.
  • This start command comprises a monostable flip-flop 44 whose input is connected by circuitry réelle.d'un dif - férentiateur 41a and 44a in contact with the contact push button 42.
  • This flip-flop 44 responds to the rising edge of the transmitted signal by closing one or other of these contacts, and its output then emits a signal of predetermined duration intended to cause an appropriate re-pressure of the hydropneumatic mattress 15 from the accumulator 26, prior to unlocking the piston free.
  • This re-pressure of the mattress is provided by means of a solenoid valve 45, excited by means of an amplifier 46, supplied with fluid by the accumulator 26 and connected to the inlet of a pressure reducer 47 whose outlet at reduced pressure is connected via a normally open solenoid valve 48 to the hydraulic enclosure 19 of the mattress.
  • the pressure reducer 47 is of the type with reduced pressure partly controlled as a function of the effective pressure in the accumulator 26 (introduced by the link 49) and with a valve for relieving the reduced pressure at the tank in the event of 'excess o
  • the start command also includes another monostable flip-flop 50 whose input is connected to the output of the monostable flip-flop 44 and which responds to the falling edge of the output signal of the latter (i.e. at the end of delivery in pressure of the mattress 15) by a signal which is applied, via an amplifier 51, to a self-holding relay 52 whose contact 52a normally open closes, when the relay is energized, the excitation circuit of the electromagnet 33 governing the unlocking of the free piston.
  • This circuit also comprises the contact 43c of the switch 43, the opening of which makes it possible to voluntarily stop the engine.
  • This command thus allows the restarting of the engine stopped at the detent dead center, after recharging the mattress 15 followed by the unlocking of the free piston, released for a compression phase, ignition and a suitable injection of fuel being provided to restart the engine. on a single compression stroke of the free piston thus prepared and triggered.
  • the electrical contact 41b closes and causes the excitation of a relay 54 whose normally closed contact 54a is placed in the circuit relay 52, which it then opens, so that the contact 52a reopens and the electromagnet 33 ceases to be energized, i.e. the locking of the free piston is then carried out at its first passage to the detent dead center by the latches 31.
  • the motor remains stopped in this position, even when the electrical contact 41b reopens due to a drop in pressure in the accumulator 26, the contact 54a closing and resetting the self-maintaining circuit of relay 52, so that a new start of the engine can, as previously explained, be caused by the next closing of the contact 41a for detecting minimum pressure in the accumulator 26 0
  • the ignition can be triggered by means of a position sensor of the free piston or of a part linked to it, such as the pumping piston 13, here provided with a magnet 13c with which cooperates in the vicinity of the top dead center a magnetic or inductive type sensor 55, which is external to the pump body in this non-magnetic case and connected by a shaping circuit 56 to a high energy trigger device 57 of sparks to the spark plug 50
  • the injector 4 can be of the electromagnetic type actuated by means of an electronic control 58 adapted to produce a control pulse triggered from the output signal from the shaping circuit 56, and having a variable duration regulating the quantity of fuel injected as a function of storing in this command 58 an injection law as a function of the pressure prevailing in the accumulator 26, this latter information being transmitted to it via a transducer 59 of the type analog or digital, in order to adapt the quantity of fuel injected to the required pumping effort which varies with the effective pressure prevailing in the accumulator.
  • Such regulation by electronic means can easily be brought into play at each cycle, in a manner known per se.
  • the injector could also be in particular a triggered injector controlled by the sensor 55 and shaping circuit 56, and with direct hydraulic control of the quantity of fuel injected at the effective pressure prevailing in the accumulator 26.
  • a rectilinear guide of the movable assembly of the engine is here provided by means of a roller 63 whose axis is fixed on the casing and which cooperates with an axial groove 12a of the piston rod 12.
  • the first 60 of the three aforementioned sensors is located so as to detect that there has been ignition of the combustible mixture but that the stroke of the piston is insufficient if it is only activated.
  • the second 61 is located so as to detect that the stroke is sufficient, while the third 62 is located so as to detect if the travel is excessive compared to that provided.
  • repositioning means comprising a friction roller 64 intended to cooperate with the piston rod 12 and which is driven by a hydraulic motor 65 which is supplied from the accumulator 26 and linked by a flange with the movable member 66 of a hydraulic cylinder 67 also actuable from the accumulator 26, by means of a solenoid valve 68 common to the supply of the cylinder 67 and to that of the motor 65.
  • the triggering of this procedure is also used to de-energize the locking electromagnet 33, for example by cutting the self-maintenance circuit of relay 52 until relocking of the free piston.
  • damping is provided at the end of the rebound stroke. of the free piston by cooperation of the pumping piston 13 with an elastic end-of-travel stop 70 with a non-linear characteristic.
  • This incident can then be signaled by an abnormal stroke detection carried out using an additional sensor 72, cooperating with the magnet 13a carried by the pumping piston, and serving to immediately actuate an engine stop command, for example by means of a self-interrupting relay holding, not shown in FIG. 1, of the supply circuit of the control electromagnet 33 for locking the free piston.
  • the inertia piston 73 is here crossed in its axis by a channel comprising a non-return valve 73a.
  • FIG. 3 illustrates a variant according to which, for the purpose of dynamic balancing of the entire generator, pumping is provided by means of two differential pistons 78, 79 constituting two weights with symmetrical and reverse movement with respect to that of the free piston 3.
  • These pistons are for this purpose arranged in two pump bodies 80, 81 parallel and symmetrical with respect to the axis of translation of the free piston, the rod 82 of which carries a transfer piston 83 sliding in a cylinder 84 connected to the two pump bodies and containing a hydraulic fluid which transmits force and movement between the transfer piston 83 and the differential pistons 78, 79 and vice versa.
  • Each differential piston 78, 79 cooperates with a hydropneumatic mattress 85, 86 with which it delimits a pumping chamber 87, 88 communicating with a valves 89, 90, the latter two supplying the hydraulic accumulator (not shown) of this generator in parallel.
  • end-of-travel end stops for these are provided at 91 and 92 in their respective pump bodies 80, 81, as well as end stops pump stroke such as the stop 93, while a stop 94, equivalent to the safety stop 70 of Figure 1, is disposed in the cylinder 84 of the transfer piston 83 0
  • the ignition trigger, injection and stroke monitoring sensors of the free piston can likewise be installed on the cylinder 84 and cooperate with the transfer piston 83 in the manner already set out for the pumping piston 13 in the figure. 1.
  • a restart procedure in the event of a failure can also be implemented as already explained.
  • FIG. 4 An example of means making it possible to ensure, in such embodiments, the race monitoring procedure, governing injection regulation, restarting in the event of a failure and the safety stop, is moreover illustrated in FIG. 4, where we find staggered in their order of installation the sensors 55, 60, 61, 62 and 72, respectively followed by the shaping circuits 56, 95, 96, 97 and 98.
  • the circuit 95 for shaping the signal from the sensor 60 as well as the circuit for shaping the signal from the sensor 61 are connected to the counting input of a binary counter. 99, the reset input of which is connected to the output of the shaping circuit 56 of the sensor signal 55, by means of a delay circuit 100, and the first two outputs of which are respectively connected to the inputs C counting and down counting D of a binary up-down counter 101, whose reset input is also connected to the output of the self-timer circuit 100.
  • the rank 1 output of the up-down counter 101 is connected to the electronic control 58, to which is also connected the output of an AND circuit 102 to the inputs of which the outputs of rank 1 and 4 of the up-down counter are connected.
  • the circuit 97 for shaping the signal from the sensor 62 is also connected to the down-counting input D of the up-down counter 101.
  • the restart procedure in the event of a failure is detected by the absence of a signal from the sensor 60 following that of the sensor 55 within a given time and, for this purpose, the outputs of the corresponding shaping circuits 56 and 95 are respectively connected to the two inputs of a flip-flop 103 whose outputs are respectively connected to the charging and discharging inputs of the RC circuit of a timed trip device 104, the output of which is connected to the winding of a relay 105 having a normally open contact 105a , a normally closed contact 105b, and a self-holding circuit passing through a static switch 106 normally conductive and actuable at cut-off from an amplifier door 107 whose input is connected to the output of the activation circuit form 97.
  • the timed trigger 104 continues to be loaded with a view to its triggering by the flip-flop 103 (instead of undergoing a cycle load short followed by a discharge cycle) and it then emits an excitation signal from the self-sustaining relay 105
  • the contact 105a of the latter is connected to the solenoid valves 48 and 69 which then ensure the exhaust of the enclosure of the hydropneumatic mattress and the pumping chamber 21, and to the solenoid valve 68 which supplies the jack 67 and the hydrau motor lique 65 driving the roller 64 cooperating with the piston rod 12 to return the free piston to the end position of relaxation and locking stroke, it should be noted that the contact 105b which has opened is placed in series with the contact 54a in the holding circuit of the relay 52, that is to say that it causes the de-excitation of the latter and of the electromagnet 33 of the locking device, so that the latches 31 are biased in the locking position of the free piston while waiting
  • the return of the free piston to the locked position is here detected by the signal from the sensor 62 of excessive travel, which then triggers the cut-off of the switch 106 and therefore that of the relay retaining circuit 105, the contact 105a of which opens again. de-energizes the solenoid valves 48, 68 and 69 and the closing contact 105b of which has no effect on the relay 52.
  • the contact 105a is connected via an adaptation circuit 108 to the input of a monostable flip-flop 109 responding to the falling edge of the solenoid excitation signal, and the output of which is connected to the inputs of amplifier 46 and of monostable flip-flop 50 so as to trigger the start-up procedure already described using the Figure 1 from the locked position of the free piston.
  • a binary counter 110 is also provided whose counting input is connected to the output of the adaptation circuit 108 and whose outputs of rank 1 and 2 are connected to an AND circuit 111, the output of which is connected by an amplifier gate 112 to an indicator light 113 indicating failure.
  • the reset of the counter 110 can result from a circuit of usual reset of the electrical components involved in each general powering up of the vehicle's electrical equipment effected by the contact 43a of the switch 43, while the aforementioned self-sustaining relays are put back to rest each time the power is turned off.
  • FIG. 4 also shows the means of the safety shutdown procedure from the activation of the sensor 72, the shaping circuit 98 of which is connected to a self-holding relay 114, normally closed, placed in the excitation circuit of the electromagnet 33 for controlling the piston locking, which it therefore de-energizes in the event of an abnormal stroke of the free piston in order to lock it by cooperation of the latches 31 with the notches 32 of its rod 12, this safety stop also being the subject of a particular signal not shown which may result from the closing of a second normally open contact of the relay 114.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Vehicle Body Suspensions (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP81105943A 1980-08-05 1981-07-28 Hydraulikgenerator mit einer Freikolbenmaschine Expired EP0045472B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8017288 1980-08-05
FR8017288A FR2488344B1 (fr) 1980-08-05 1980-08-05 Generateur hydraulique a moteur a piston libre

Publications (2)

Publication Number Publication Date
EP0045472A1 true EP0045472A1 (de) 1982-02-10
EP0045472B1 EP0045472B1 (de) 1986-03-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP81105943A Expired EP0045472B1 (de) 1980-08-05 1981-07-28 Hydraulikgenerator mit einer Freikolbenmaschine

Country Status (6)

Country Link
US (1) US4415313A (de)
EP (1) EP0045472B1 (de)
JP (1) JPS5752685A (de)
DE (1) DE3173974D1 (de)
ES (1) ES8206770A1 (de)
FR (1) FR2488344B1 (de)

Cited By (8)

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FR2538043A1 (fr) * 1982-12-21 1984-06-22 Mosser Yves Generateur hydraulique a moteurs thermiques a pistons libres
EP0132808A1 (de) * 1983-07-20 1985-02-13 George L. Coad Brennkraftmaschine mit intermittierendem Zyklus
WO1985003979A1 (en) * 1984-03-07 1985-09-12 Frank Stelzer Hydraulic pump
EP0254353A1 (de) * 1986-07-25 1988-01-27 De Rotterdamsche Droogdok Maatschappij B.V. Freikolbenmotor mit hydraulischer oder pneumatischer Übertragung
NL1001939C2 (en) * 1995-04-10 1996-10-11 Potma Beheer B V T Device for generating fast movement for controlling free piston aggregate in particular
NL1000479C2 (en) * 1995-06-01 1996-12-03 Potma Beheer B V T Device for generating fast movement for controlling free piston aggregate in particular
WO1997037129A1 (de) * 1996-04-02 1997-10-09 Waldemar Reimann Pumpe für flüssigkeiten
US6931845B2 (en) 2000-05-19 2005-08-23 Bosch Rexroth Ag Free piston engine

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AU675792B2 (en) * 1992-05-29 1997-02-20 Innogy Plc A gas compressor
US5464331A (en) * 1993-11-09 1995-11-07 Sawyer; James K. Engine and power output
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US6170442B1 (en) 1997-07-01 2001-01-09 Sunpower, Inc. Free piston internal combustion engine
US5775273A (en) * 1997-07-01 1998-07-07 Sunpower, Inc. Free piston internal combustion engine
US6035637A (en) 1997-07-01 2000-03-14 Sunpower, Inc. Free-piston internal combustion engine
US6293231B1 (en) 1999-09-29 2001-09-25 Ingo Valentin Free-piston internal combustion engine
DE10026728A1 (de) 1999-11-24 2001-05-31 Mannesmann Rexroth Ag Freikolbenmotor
US6582204B2 (en) * 2001-09-06 2003-06-24 The United States Of America As Represented By The Administrator Of The U.S. Enviromental Protection Agency Fully-controlled, free-piston engine
US6694930B2 (en) * 2001-10-04 2004-02-24 Caterpillar Inc Piston assembly for use in a free piston internal combustion engine
WO2003078809A2 (en) * 2002-03-15 2003-09-25 Advanced Propulsion Technologies, Inc. Internal combustion engine
US7728446B2 (en) 2003-06-25 2010-06-01 Advanced Propulsion Technologies, Inc. Ring generator
EP3081772A1 (de) 2003-06-25 2016-10-19 Advanced Propulsion Technologies, Inc. Verbrennungsmotor
US7373870B2 (en) * 2005-04-20 2008-05-20 Grigoriy Epshteyn Universal hybrid engine, compressor and pump, and method of operation
GB2437742B (en) * 2006-05-02 2011-03-09 Boc Group Plc Free piston engine
US7757800B2 (en) * 2006-12-12 2010-07-20 Grigoriy Epshteyn Monocylindrical hybrid powertrain and method of operation
US8206129B2 (en) * 2008-07-27 2012-06-26 Sanderson Robert A Supercharged internal combustion engine including a pressurized fluid outlet
US10690126B2 (en) * 2018-08-01 2020-06-23 KISS-Engineering Inc. Dual engine-compressor system

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FR2538043A1 (fr) * 1982-12-21 1984-06-22 Mosser Yves Generateur hydraulique a moteurs thermiques a pistons libres
EP0132808A1 (de) * 1983-07-20 1985-02-13 George L. Coad Brennkraftmaschine mit intermittierendem Zyklus
WO1985003979A1 (en) * 1984-03-07 1985-09-12 Frank Stelzer Hydraulic pump
EP0254353A1 (de) * 1986-07-25 1988-01-27 De Rotterdamsche Droogdok Maatschappij B.V. Freikolbenmotor mit hydraulischer oder pneumatischer Übertragung
US4791786A (en) * 1986-07-25 1988-12-20 De Rotterdamsche Droogdok Maatschappij Free-piston motor with hydraulic or pneumatic energy transmission
NL1001939C2 (en) * 1995-04-10 1996-10-11 Potma Beheer B V T Device for generating fast movement for controlling free piston aggregate in particular
NL1000479C2 (en) * 1995-06-01 1996-12-03 Potma Beheer B V T Device for generating fast movement for controlling free piston aggregate in particular
WO1997037129A1 (de) * 1996-04-02 1997-10-09 Waldemar Reimann Pumpe für flüssigkeiten
US6931845B2 (en) 2000-05-19 2005-08-23 Bosch Rexroth Ag Free piston engine

Also Published As

Publication number Publication date
ES504537A0 (es) 1982-08-16
ES8206770A1 (es) 1982-08-16
FR2488344A1 (fr) 1982-02-12
FR2488344B1 (fr) 1985-12-27
US4415313A (en) 1983-11-15
JPS5752685A (en) 1982-03-29
DE3173974D1 (en) 1986-04-10
EP0045472B1 (de) 1986-03-05

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