WO1992002730A1 - Moteur a pistons libres - Google Patents

Moteur a pistons libres Download PDF

Info

Publication number
WO1992002730A1
WO1992002730A1 PCT/EP1991/001460 EP9101460W WO9202730A1 WO 1992002730 A1 WO1992002730 A1 WO 1992002730A1 EP 9101460 W EP9101460 W EP 9101460W WO 9202730 A1 WO9202730 A1 WO 9202730A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
pistons
free
piston engine
engine according
Prior art date
Application number
PCT/EP1991/001460
Other languages
German (de)
English (en)
Inventor
Gerhard Brandl
Original Assignee
Gerhard Brandl
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 Gerhard Brandl filed Critical Gerhard Brandl
Publication of WO1992002730A1 publication Critical patent/WO1992002730A1/fr

Links

Classifications

    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0003—Piston machines or pumps characterised by having positively-driven valving the distribution member forming both the inlet and discharge distributor for one single pumping chamber
    • F04B7/0015—Piston machines or pumps characterised by having positively-driven valving the distribution member forming both the inlet and discharge distributor for one single pumping chamber and having a slidable movement
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines
    • 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

Definitions

  • the invention relates to a free-piston engine.
  • Such motors are known for example from the following publications: DE 26 48 958 C2, DE-PS 12 60 860; DE 23 07 760 B2; DE 22 17 194 B2; DE-AS 14 80 101.
  • the invention aims to provide a free-piston engine that has a high efficiency with a simple structure. To achieve this object, the invention provides the measures mentioned in the claims.
  • FIG. 1 shows a longitudinal section through a first embodiment of a free-piston engine
  • FIG. 2 shows a section through a second exemplary embodiment of an exemplary embodiment of a free-piston engine
  • the free-piston engine has one or more pistons 1, with which oil pistons 2 are rigidly connected, see FIG. 1, or two pistons 1 working against each other, see FIG. 2.
  • the rear side of the pistons 1 is used to convey the combustion air via the inlet slot 4, overflow channel 5 and outlet slot 6 used.
  • the pistons 1 are set in a reciprocating movement by corresponding actuation of hydraulic valves 8.
  • valve spools 9 which are excited by electrically operated pilot valves 10, execute an oscillating movement.
  • the oscillation of the pistons 1 results from the oscillating movement of the valve slide 9.
  • a microprocessor 12 switches the pilot valves 10 and thus ensures the starting and stabilization of the oscillation of the pistons 1.
  • the pistons 1 are held at the bottom dead center by means of a spring 7.
  • the pistons 1 are now accelerated towards the top dead center by pressure oil, which acts on the oil pistons 2.
  • the time period of the pressure oil effect is chosen so that the pistons 1 reach that speed which is required to effect the desired compression of the combustion air.
  • the pilot valves 10 are actuated electrically by the microprocessor 12.
  • the valve spool 9 is accelerated with pressure oil. They swing out of the rest position and open the pressure oil connection 13. Then the valve slides 9 swing back due to the effect of pressure oil on the rear side. They are braked with a pressure oil effect on the front and remain at rest.
  • the opening time of the pressure oil connection 13 is determined by a corresponding choice of the control times of the pilot valves 10 and the choice of the reversal point of the valve spool 9. If the reversal point of the valve slide 9 is just behind the opening point of the pressure oil connection 13, the opening time is short. If the reversal point is further behind, the opening time is longer.
  • the piston speed is measured with one or more sensors 11.
  • the valve slide 9 open the pressure oil connection 13 and thereby brake the piston 1.
  • the opening time and the opening time of the pressure oil connection 13 are calculated from the piston speed by the microprocessor 12 according to stored curve functions. By selecting from various curve functions, air pressure, oil pressure, temperature and other influences are taken into account.
  • the opening time is chosen so that the pistons 1 reverse their movement near the bottom dead center.
  • the opening time is chosen so that the pistons 1, after the reversal of movement, reach the speed required for the next compression.
  • the opening time and duration of the pressure oil connection 13 are maintained by corresponding switching times of the pilot valves 10 switched by the microprocessor 12.
  • the oscillating movement of the valve slide 9 is controlled according to the scheme described during the starting process.
  • the pistons 1 are stopped at the bottom dead center by corresponding valve timing.
  • pilot valves 10 are actuated electrically by the microprocessor 12.
  • One (upper) pilot valve 10 opens the pressure oil connection 13.
  • the pressure oil acts on the top (front) of the valve spool (s) 9 and accelerates it. He (she) swings (swing) from the rest position and opens (open) the pressure oil connection 13.
  • pressure oil acts on the piston (s) 1, accelerates it (them) towards top dead center and initiates the starting process.
  • the other (lower) pilot valve (s) 10 open (open) on the basis of a signal from the microprocessor 12.
  • pressure oil now acts on the underside (rear) of the (the) Valve spool (s) 9 and slows down its movement.
  • the other (lower) pilot valve 10 remains open.
  • valve spool (s) 9 now accelerates the valve spool (s) 9 in the opposite direction and begins to swing back. Then the lower (other) pilot valve 10 closes and the valve spool 9 continues to move with momentum.
  • valve slide 9 After a certain time, the valve slide 9 has moved back so far that the pressure oil connection 13 is closed again. Now no more pressure oil acts on the piston 1 and it moves with momentum to top dead center, where it Combustion air compresses and where the ignition of the first work cycle takes place.
  • the time in which the pressure oil connection 13 was open was calculated so that the piston 1 has reached such a speed that the desired compression occurs at top dead center.
  • valve slide 9 was braked at the right time by opening the lower (other) pilot valve (10) and then accelerated in the opposite direction.
  • the correct opening time of the lower (other) pilot valve 10 was calculated by the microprocessor 12 and the pilot valve 10 was actuated electrically by the microprocessor.
  • valve slide 9 is braked by reopening the upper (one) pilot valve 10 and remains in the upper rest position.
  • the valve spool 9 is held in the rest position by an oil pressure difference between the top (front side) and underside (rear).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

Dans un moteur à pistons libres, un ou plusieurs pistons (1), reliés à des pistons hydrauliques (2) de préférence de manière rigide, sont librement mobiles dans des cylindres dans le sens de l'axe longitudinal, de sorte que la face postérieure du piston (1) sert à la circulation de l'air de combustion, le déplacement du piston étant amorcé et commandé par des soupapes hydrauliques (8) à commande électronique.
PCT/EP1991/001460 1990-08-02 1991-08-02 Moteur a pistons libres WO1992002730A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904024591 DE4024591A1 (de) 1990-08-02 1990-08-02 Freikolbenmotor
DEP4024591.8 1990-08-02

Publications (1)

Publication Number Publication Date
WO1992002730A1 true WO1992002730A1 (fr) 1992-02-20

Family

ID=6411543

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1991/001460 WO1992002730A1 (fr) 1990-08-02 1991-08-02 Moteur a pistons libres

Country Status (2)

Country Link
DE (1) DE4024591A1 (fr)
WO (1) WO1992002730A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469279A (en) * 2009-04-07 2010-10-13 Rikard Mikalsen Linear reciprocating free piston external combustion open cycle heat engine
US8887690B1 (en) 2010-07-12 2014-11-18 Sturman Digital Systems, Llc Ammonia fueled mobile and stationary systems and methods
US9206738B2 (en) 2011-06-20 2015-12-08 Sturman Digital Systems, Llc Free piston engines with single hydraulic piston actuator and methods
US9464569B2 (en) 2011-07-29 2016-10-11 Sturman Digital Systems, Llc Digital hydraulic opposed free piston engines and methods

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ330497A3 (cs) * 1995-04-20 1998-05-13 Split Cycle Technology Limited Motor s volným pístem
NO300236B1 (no) * 1995-05-02 1997-04-28 Kvaerner Asa Kraftaggregat
DE19606040C2 (de) * 1996-02-19 2000-09-28 Univ Dresden Tech Schnellschaltendes Hydraulikventil
US6206656B1 (en) * 1999-02-22 2001-03-27 Caterpillar Inc. Method of operating a free piston internal combustion engine with high pressure hydraulic fluid upon misfire or initial start-up
DE10026728A1 (de) 1999-11-24 2001-05-31 Mannesmann Rexroth Ag Freikolbenmotor
JP2003524727A (ja) 1999-11-24 2003-08-19 マネスマン レクソロート アクチェンゲゼルシャフト フリーピストン機関
US6931845B2 (en) 2000-05-19 2005-08-23 Bosch Rexroth Ag Free piston engine
DE10033443A1 (de) * 2000-07-10 2002-02-07 Mannesmann Rexroth Ag Freikolbenmotor
US7082909B2 (en) 2002-04-25 2006-08-01 Deutsches Zentrum Fur Luft- Und Raumfahrt E.V. Free-piston device with electric linear drive
US8596230B2 (en) 2009-10-12 2013-12-03 Sturman Digital Systems, Llc Hydraulic internal combustion engines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1332799A (en) * 1970-10-12 1973-10-03 Riekkinen As Hydraulic power unit including a hydraulic pump operated by a free piston internal combustion engine
US4307999A (en) * 1979-06-25 1981-12-29 Pneumo Corporation Free piston engine pump including variable energy rate and acceleration-deceleration controls
US4382748A (en) * 1980-11-03 1983-05-10 Pneumo Corporation Opposed piston type free piston engine pump unit
EP0085800A2 (fr) * 1982-02-10 1983-08-17 Pneumo Abex Corporation Pompe entrainée par un moteur à piston libre

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE672028A (fr) * 1964-11-25
FR2133179A5 (fr) * 1971-04-09 1972-11-24 Jarret Jacques
DE2307760C3 (de) * 1973-02-16 1975-11-06 Jacques Henri Le Vesinet Jarret Hydraulische Feder
DE2648958C2 (de) * 1976-10-28 1983-02-17 Karl-Heinz 8722 Sennfeld Fengler Hydraulische Kolbenpumpe mit Antrieb durch Freikolben-Verbrennungskraftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1332799A (en) * 1970-10-12 1973-10-03 Riekkinen As Hydraulic power unit including a hydraulic pump operated by a free piston internal combustion engine
US4307999A (en) * 1979-06-25 1981-12-29 Pneumo Corporation Free piston engine pump including variable energy rate and acceleration-deceleration controls
US4382748A (en) * 1980-11-03 1983-05-10 Pneumo Corporation Opposed piston type free piston engine pump unit
EP0085800A2 (fr) * 1982-02-10 1983-08-17 Pneumo Abex Corporation Pompe entrainée par un moteur à piston libre

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469279A (en) * 2009-04-07 2010-10-13 Rikard Mikalsen Linear reciprocating free piston external combustion open cycle heat engine
US9046055B2 (en) 2009-04-07 2015-06-02 University Of Newcastle Upon Tyne Heat engine
US8887690B1 (en) 2010-07-12 2014-11-18 Sturman Digital Systems, Llc Ammonia fueled mobile and stationary systems and methods
US9206738B2 (en) 2011-06-20 2015-12-08 Sturman Digital Systems, Llc Free piston engines with single hydraulic piston actuator and methods
US9464569B2 (en) 2011-07-29 2016-10-11 Sturman Digital Systems, Llc Digital hydraulic opposed free piston engines and methods

Also Published As

Publication number Publication date
DE4024591A1 (de) 1992-02-06

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